Alkali-Resistant Bricks for Rotary Kiln

In the production of rotary kilns, harmful components such as alkali, sulfur, and chlorine from raw materials and fuels form alkali sulfate and alkali chloride in the high-temperature zone and escape with the kiln gas. In addition to erosion and damage to alkaline bricks in the firing zone and transition zone. When it reaches the kiln tail smoke chamber, decomposition furnace, preheater, etc., it condenses and enriches due to the temperature drop. It can penetrate into ordinary clay bricks and react chemically with the brick body to generate expandable minerals, causing the clay bricks to crack and peel off, causing alkali cracking damage. Due to the high temperature of the clinker leaving the kiln, alkali will continue to evaporate from the clinker, corroding the refractory clay bricks of the kiln head cover at the hot end of the grate cooler, causing alkali cracks.

Refractory clay bricks with an Al2O3 content of 25% to 45% allow alkali to react quickly with the bricks after condensing on the brick surface. A high-viscosity glaze layer is formed, which seals the channel for alkali to continue to erode into the brick body, thereby preventing alkali cracking. If the atmosphere in the kiln contains a lot of chlorine, the SiO2 content in the bricks can be appropriately increased to increase the ability of the brick surface to bond with chlor-alkali and make alkali-resistant clay bricks that are resistant to chlor-alkali erosion. In order to adapt to the erosion of the lining material by the airflow carrying clinker dust in the tertiary air duct of the precalciner kiln, high-strength alkali-resistant clay bricks can also be made. In order to meet the heat insulation requirements of the kiln body and preheater barrel, lightweight alkali-resistant bricks can also be made.

High-strength alkali-resistant brick products have the characteristics of high strength, stable volume, resistance to penetration, and good resistance to alkali erosion. High-strength alkali-resistant bricks are mainly used in cement kiln preheaters, decomposition furnaces, tertiary air ducts, and other parts.

Alkali-Resistant Bricks for Rotary Kiln

Introduction and Analysis of the Characteristics of Alkaline Refractory Bricks

Resistance to erosion. Alkaline bricks have good corrosion resistance against metallurgical slag, cement clinker, glass kiln ingredients, and ash. Different heat media have different effects on alkaline bricks. In a strong alkaline environment, such as the cement kiln firing zone, the corrosion resistance of cement clinker is in the order: magnesia dolomite bricks>magnesia chrome bricks>magnesia spinel bricks. In converter and electric furnace linings, magnesia bricks with high CaO/SiO2 are better than magnesia bricks with low CaO/SiO2. In the glass kiln regenerator grid, magnesia bricks with a low CaO/SiO2 ratio are better than corresponding magnesia bricks with a high CaO/SiO2 ratio. When producing stainless steel in an AOD furnace, the slag basicity is less than 2.2, and the slag resistance of magnesia-chrome bricks is better than that of magnesia-dolomite bricks. The slag alkalinity is greater than 2.2, and the slag resistance of magnesia dolomite bricks is better than that of magnesia-chrome bricks. In heavy non-ferrous metallurgical furnaces, the ability to resist FeO-SiO2 slag: magnesia chrome bricks > magnesia bricks > magnesia spinel bricks > magnesia dolomite bricks.

Water resistance. Compared with high alumina bricks, clay bricks, and silica bricks, alkaline refractory bricks have the worst hydration resistance. Among alkaline refractory bricks, magnesia-calcium bricks have the most severe hydration tendency and are directly proportional to the CaO content in the product. Therefore, when using alkaline bricks in production, storage, transportation, and masonry, attention should be paid to waterproofing issues.

Vacuum resistance. The vapor pressure of refractory materials is very low at normal temperature, but when there is high-temperature decompression work (such as vacuum processing of molten steel in RH and VOD refining furnaces), the refractory materials are lost due to volatilization. The volatilization rate is proportional to the vapor pressure of the refractory material. The greater the relative molecular mass of the gas phase, the greater the volatilization amount. As refractory materials for vacuum furnaces, calcareous and dolomite products have better vacuum resistance than spinel bricks, magnesia bricks, and magnesia chrome bricks.

Conductivity. Refractory materials (except carbon-containing products) are poor conductors of electricity at room temperature. As temperature increases, resistivity decreases, and conductivity increases. Among alkaline products, periclase products have the best electrical insulation properties. The unit volume resistance at 800℃ is greater than 108Ω·cm. Greater than 106 Ω·cm at 1000℃. Chromite spinels are both semiconductors, and their room temperature resistivities vary greatly. Fe3O4 is 10-2Ωn·cm. MgAl2O4 and MgCr2O4 are greater than 10 10 Ω.cm. Impurities in refractory materials have an important impact on high-temperature conductivity, especially iron oxide and calcium oxide. The resistivity of the same alkaline brick increases as the porosity increases. At high temperatures, the effect of porosity on resistivity will be significantly weakened or even disappear.

Self-Flowing Refractory Castables for Heating Furnaces

The self-flowing refractory castable for heating furnaces is made of bauxite clinker as refractory aggregate, mixed with first-grade bauxite clinker and mullite aggregate. Refractory powder uses special-grade bauxite clinker powder, corundum powder, and mullite powder. At the same time, α-Al2O3 and SiO2 ultrafine powder and expansion agent are added, aluminate cement is used as the binding agent and a phosphate water-reducing agent is added.

Self-Flowing Refractory Castable for Sale

The water consumption of self-flowing castables for heat furnaces is slightly higher than that of vibrating low-cement refractory castables of the same material. However, the performance of self-flowing refractory castables is still good, especially its high strength and small linear change after burning. This material is self-leveling and has good air exhaust because its particle gradation is reasonable and can achieve the tightest packing density. The binding agent, ultrafine powder, and water-reducing agent are reasonably selected and used in just the right amount, so they can overcome the defects caused by large amounts of water and improve their performance.

When the composition, mix ratio, and water consumption of self-flowing refractory castables for heating furnaces remain unchanged, adjust the addition amounts of the two to ensure that the combined amount is 7%. As the amount of uf-SiO2 increases, the flow value begins to increase sharply and then levels off. The flexural strength does not change much after burning, and there is an optimal value. After burning, the line change first increased from negative to positive and then shrank sharply. The dosage of uf-SiO2 is generally 3%~5%. That is, when the dosage of α-Al2O3 ultrafine powder is 4% to 2%, the flow value of the castable is ≥180mm, and the physical and mechanical properties are also good.

When configuring the self-flowing castable for the heating furnace, its composition materials and water consumption remain unchanged. When the cement consumption is increased, the fine powder consumption is correspondingly reduced. As the amount of CA-70 cement increases, the flow value of the castable decreases. The linear change after burning at 1450℃ changes from a positive value to a negative value, that is, from linear expansion to linear contraction. Because the amount of cement is large, the free water consumed during hydration increases. As a result, the viscosity of the castable increases, the flow value decreases, the density also decreases, and the linear change after burning changes from a positive value to a negative value. Then, the optimal dosage of cement is 2% to 6%, and the flow value and physical properties of the castable are the best.

Self-Flowing Castable Refractory

Where are Self-Flowing Refractory Castables Generally Used?

With the development of modern industry, due to the fluidity of self-flowing refractory castables, self-flowing refractory castables are very suitable for use in parts with thin walls or complex shapes that cannot be vibrated for molding. At present, there are more and more applications of self-flowing refractory castables. Self-flowing refractory castable is a refractory material that can flow and degas without vibration.

Rongsheng refractory material manufacturer has an environmentally friendly, fully automatic unshaped refractory material production line. The characteristic of our self-flowing refractory castables is that they can be poured into various shapes of construction bodies without vibration by adding appropriate water without reducing or significantly reducing the performance of the castables. Generally used in construction sites with narrow and complex shapes. Such as the wrapping of water pipes at the bottom of steel rolling heating furnaces and the furnace walls of heating furnaces with special structures for heat storage. It is particularly convenient to use self-flowing refractory castables in certain areas that require local modification and filling.

This time let’s take the channel heating furnace as an example. There are many mutually isolated regenerators in the furnace body of the channel heating furnace, as well as many criss-crossing gas pipes or air pipes. It is very easy to cause problems when using traditional vibration molding castables to burn the mainstream. Due to the unreasonable gradation of ordinary refractory castables, it is prone to a series of reasons such as poor stability, reduced strength, and cracking.

Ordinary refractory castables use vibration equipment to make the castables flow during the construction process to achieve the required filling effect. However, vibration equipment cannot be used in a location with narrow space and complex shape such as the furnace wall of the regenerator (the furnace wall is a multi-layer structure, constructed in layers, and the thickness of each layer is about 100mm). This phenomenon can be avoided by using self-flowing refractory castables.

To purchase high-quality self-flowing refractory castables, please contact us. Get prices and samples for free.

Application of Shrinkage-Free Fused Zirconium Corundum Bricks

In recent years, the advancement of kiln technology has continuously raised the quality requirements for tilt-cast fused zirconium corundum bricks, and their usage has continued to expand. As a manufacturer, the production process of tilt-cast bricks has been updated and improved. The quality of the products has reached a relatively high level, basically reaching the international advanced level of similar products. Application of shrinkage-free fused zirconium corundum bricks. The new process highlights the characteristics of tilt-cast bricks. After strict optimization of the tilt angle, strict quality control was achieved. As a result, the shrinkage hole distribution of the product is very reasonable.

Fused Cast α-β Aluminum Refractory Bricks for Glass Kilns

Fused zirconium corundum brick cast without shrinkage cavity

The demand for fused zirconium corundum bricks cast without shrinkage holes has been increasing day by day in recent years. In addition to the 41# fused zirconium corundum bricks that are almost entirely cast without shrinkage holes, the demand for oxidation method 33# non-shrinkage fused zirconium corundum bricks has also increased significantly. The production cost of this product is high and the production process is relatively complex, so the product sells for a higher price. In recent years, glass-melting furnaces using dense end-cast bricks have also appeared in China. This product is mostly used on the pool wall. From the perspective of manufacturing fused bricks, the process is simpler than shrinkage-free casting, the manufacturing cost is relatively low, and the sales price is of course different. The performance on the pool wall is almost the same as that of non-shrinkage cast bricks.

Basic principles for the application of shrinkage-free fused zirconium corundum bricks

(1) For the pool wall bricks in contact with the molten glass, use the oxidation method 33# to tilt-cast zirconium corundum bricks. This choice is relatively reasonable both technically and economically. If you consider the need for bricks in the later stages of the furnace, it will be even more foolproof if you make slight changes in the brick type. Of course, compared with the traditional bottom-up multi-layer brick construction of the pool wall, this choice of pool wall bricks has more advantages than disadvantages, but there is also the problem of considering one at the expense of the other. Therefore, many furnace designers are still accustomed to traditional tank wall structures. It should be pointed out that it is the best choice to use 20mm thick 44# non-shrinkage AZS bricks for the upper pool wall, while the quality grade of the lower pool wall bricks can be reduced in turn.

It is worth noting that when choosing multiple varieties of pool wall tiles, attention should be paid to the grade gap between adjacent fused bricks and tiles should not be too large. Because from the perspective of the production of various types of refractory materials, there are great differences in physical and chemical indicators, mineral composition, and performance between high- and low-grade materials. It is technically and economically unreasonable to use them adjacently.

(2) The upper structure of the furnace can almost always be made of ordinary cast fused zirconium corundum bricks, and their functions are fully sufficient.

(3) For melting furnaces with kiln bottom insulation, 75mm thick oxidation method 33# non-shrinkage AZS bricks are most suitable for the kiln bottom pavement. Used in conjunction with zirconium corundum ramming material during construction.

(4) The side walls, flat bricks, and inclined bricks of the small furnace are generally made of 33# zirconium corundum bricks made by the reduction method of ordinary casting. The furnace bottom can also be made of 33# zirconium corundum bricks without shrinkage holes or densely cast.

(5) It is best to use ordinary cast α-β alumina bricks for the tank wall of the clarification part. The bottom of the kiln should be made of α-β alumina bricks cast without shrinkage holes. The cost of this choice of kiln is higher, and oxidation method 33# AZS bricks can also be used instead.

High-quality AZS bricks for glass kilns have reliable product quality and can effectively extend the service life of the glass kiln. Rongsheng refractory materials manufacturer.

How to Identify the Quality of Acid-Resistant Bricks?

Acid-resistant bricks, according to the literal meaning, are named based on their unique and superior acid-resistant properties. The acid-resistant bricks produced by RS refractory material manufacturers also have good wear resistance, corrosion resistance, and pollution resistance. Acid-resistant bricks and refractory bricks need to undergo strict inspection procedures before leaving the factory. Acid-resistant bricks are mainly used for lining anti-corrosion containers, trenches, and other equipment in reaction towers in metallurgy, chemical, petroleum, and other industries. The quality of the acid-resistant bricks produced by RS acid refractory material manufacturers meets national standards, and can also be produced according to user requirements and special requirements provided by the design department.

Acid Resistant Bricks Corrosion Resistant

To identify the quality of acid-resistant bricks, we must look at the following points.

1. Look at the water absorption rate of acid-resistant bricks.

First, we need to look at the water absorption rate of acid-resistant bricks. The stronger the water absorption, the worse the quality of the brick. So, when you see that the acid-resistant bricks you bought do not absorb water at all when placed in water. Well, congratulations, the quality of the acid-resistant bricks you purchased is very good.

2. Anti-pollution.

do you know? Acid-resistant bricks have different pollution resistance, acid resistance, and corrosion resistance. The so-called pollution resistance refers to the ease of cleaning acid-resistant bricks. If the stains on it are easier to clean, it is recommended to buy it.

3. The flatness of acid-resistant bricks.

The flatness of acid-resistant bricks will also affect their later use. Especially uneven acid-resistant bricks are easy to warp later. After it becomes warped, it will need to be purchased again and re-paved. Therefore, it is recommended that when purchasing, you must choose a good brand of acid-resistant bricks, and do not be greedy for small gains and suffer big losses. Because the acid-resistant bricks are used in an industrial environment, knocking them out and replacing them with new ones will not only cost the acid-resistant bricks, but also the labor construction money, and even cause the company to stop production. The losses caused by this cannot be underestimated.

4. Wear resistance.

It is no longer a problem for acid-resistant bricks to achieve good wear resistance in the acid-resistant industry. Generally speaking, the wear resistance of acid-resistant ceramic tiles produced and sold by regular manufacturers can meet market demand and national testing standards. Furthermore, acid-resistant ceramic tiles with good wear resistance are also more slip-resistant.

5. Straightness

If the corners of acid-resistant bricks are not straight, it will have a great impact on the laying and use of acid-resistant bricks. According to the company’s professional construction personnel, if the corners of the acid-resistant bricks are not at right angles, there will be a large gap between the bricks when they are posted. Not only does it look unsightly, but it also easily traps dirt and is difficult to clean, making the floor look very dirty.

At this point, you will definitely find that purchasing acid-resistant bricks is not as easy as it sounds. In fact, everything has its own laws. As long as we follow these laws, we don’t have to worry about being deceived. The same goes for choosing acid-resistant bricks. The brand is important, and quality is even more important. RS is a refractory material manufacturer with reliable product quality and guaranteed after-sales service.

Acid-Resistant Bricks for the Chemical Industry

Inorganic acids such as sulfuric acid, nitric acid, hydrochloric acid, and phosphoric acid are irresistible in the chemical industry. Chemical products such as soda ash, caustic soda, synthetic ammonia, fertilizers, and inorganic salts are highly corrosive. So, how do they prevent these acids and alkalis and their corrosive capabilities? Many customers have chosen industrial anti-corrosion and acid-resistant bricks that are acid and alkali-resistant. So what role do acid-resistant bricks play in the chemical industry? The main function of acid-resistant bricks is to resist corrosion, acid, and alkali. It is not easily oxidized at normal temperature and can withstand any high-concentration alkaline medium. It has excellent corrosion resistance to sulfuric acid, nitric acid, hydrochloric acid, and phosphoric acid in warm chlorine salt water.

High-Strength Mullite Castable Used in Rotary Kiln

High-strength mullite castables are used in some important parts such as the front kiln mouth of the rotary kiln, the high-temperature grade discharge pipe, the tertiary air duct, and the tertiary air valve. RS Refractory Materials Manufacturer can provide refractory lining materials for various high-temperature industrial furnaces. During use, the following aspects should be paid attention to when using high-strength mullite castables.

Mullite Refractory Castable in Rongsheng

1. Strive to improve the system operation rate of the kiln

The operation rate represents a series of issues such as whether the production is normal, whether the operation is precise and stable, and the number of faults starts and stops. The refractory materials in the precalciner kiln production line are most afraid of kiln startup and shutdown. In particular, the kiln mouth castable is the most vulnerable part to kiln startup and shutdown. The higher the kiln’s continuous operation rate, the longer the castable life. Once abnormal faults such as preheater blockage occur, the surface temperature of the kiln mouth lining will drop from about 1,400°C to 100-200°C in more than 10 hours. After the fault was eliminated, the temperature rose sharply to normal temperature. Such intense alternation of hot and cold is repeated, and the high-temperature structure of the cast body is destroyed and easily explodes and peels off. It has a great impact on the service life.

2. The amount of water added to high-strength mullite castables

Hydraulic castables must rely on mixing water and binders to produce the necessary initial strength, molding, and flow. On the other hand, the amount of water and binding agent is sufficient to achieve this goal. The water consumption must be as little as possible to meet the minimum construction fluidity of various parts. When the lining undergoes high-temperature baking, it will develop high-temperature sintering strength that can withstand the working temperature.

3. Pay great attention to the mixing and homogenization process

The importance of this work is mainly reflected. First, refractory materials will generate certain mineral phases at high temperatures. This is the result of the chemical reaction of various elements inside the lining material. Various high-temperature properties depend on the mineral phase and its degree of homogenization. In the same way, only if the components in the raw materials are uniform will it be conducive to its reaction and the formation of mineral phases. Second, the binding agent and its water can only be dispersed evenly. Only by evenly wrapping the surface of material particles can they condense more tightly and firmly.

The construction process of high-strength mullite castables. Dedicated personnel are responsible for management. Use a forced mixer to mix, no more than 300 kg at a time. All pouring materials including small bags must be poured in before stirring to prevent pouring materials while stirring. Dry mix for about 2 minutes or after visually observing that the color of the castable is evenly mixed, quickly add 70% to 80% of the water. After stirring evenly, check the amount of water, then slowly add insufficient water and continue stirring. The total mixing time should be controlled within 5 minutes, and prolonged mixing should be avoided. To ensure that the castable has good flow plasticity and does not produce an initial setting. The mixed materials are put out at one time to avoid marathon construction that involves mixing and putting them in place at the same time. It also frees up time for the next mixing preparation.

4. Reasonably select and use kiln mouth-guard iron

The main purpose of this work is to effectively protect the kiln mouth cylinder. Protecting the kiln mouth cylinder will ensure the safety of the castable use environment, thereby increasing the service life of the overall kiln lining. Therefore, in many cases, problems with the castables at the kiln mouth are not necessarily due to the quality of the castables themselves. There may be problems with machinery, operation, etc., and it is necessary to systematically analyze and find the root cause of the problem. The general starting point is that under normal operating conditions, the lower the temperature of the kiln mouth barrel, the better.

5. The key is the connection between various processes during maintenance and construction.

Cleaning the castables at the old kiln mouth is labor-intensive and time-consuming, and must be done patiently and thoroughly to ensure that the anchor nails can be arranged and welded as required and that the castables are fully adhered to the cylinder. It is best to use the “Y” type anchor nail with the letter “∪” at the bottom. In this case, as long as the welder’s responsibility is in place, the welding will be firm and there will be no problem. It can also effectively prevent the two supporting corners from being burned and damaged. The expansion joints should be carefully calculated based on the linear expansion rate of the castable material and combined with practical experience. In principle, the number of points and amount left should be few rather than too many to reduce the chance of high-temperature hot air drilling into gaps. All anchors are wrapped with black tape to compensate for their expansion space. Mix the materials evenly to ensure that the castables are not stratified and can be mixed and used to prevent the mixed castables from being left unused for a long time.

Effect of the Composition of Raw Materials on the Performance of Silica Ramming Mass Materials

What effect does the composition of raw materials have on the performance of silica ramming mass materials? A refractory material technology team studied the impact of the physical and mechanical properties of silica refractory ramming materials by adding clay and replacing silica with quartz sand. The results of the research experiment clarified the maximum addition amounts of clay from the Angren mine and quartz sand from the Jeroysko mine in the siliceous batching, thus determining the optimal batching composition of the silica ramming mass material. Experiments also show that in the ingredients of silica and clay mixtures, the amount of clay added should not exceed 25%. The amount of quartz sand used to replace silica in a mixture of silica, clay, and quartz sand should also be less than 25% and should be compatible with the amount of clay added. Based on the above experimental results, the formula of the best ingredients for the production of silica ramming mass materials was finally completed.

Silica Ramming Material – Acidic Ramming Mass

The above-mentioned experiments on the raw material composition of silica ramming mass materials also provide a realistic basis for the ingredients composition of amorphous refractory materials produced by various refractory material manufacturers using local raw materials. This is also one of the main problems that the refractory materials industry in many countries in the world urgently needs to solve.

RS Refractory Material Manufacturer is a refractory material manufacturer with rich production and sales experience. Our refractory products have been sold to more than 100 countries and regions around the world. RS manufacturer has an independent production plant for unshaped refractory materials and refractory bricks. Our new refractory precast shapes factory will also be ready to serve customers soon. RS refractory material manufacturer looks forward to cooperating with you.

Will Silica Ramming Mass Materials Affect the Generation of Impurities During Copper Alloy Smelting?

“Accumulation of impurity elements” refers to the phenomenon that the content of individual impurity elements gradually increases after a certain alloy ingot (billet) has been continuously produced for a long time. The main reasons for the accumulation of impurity elements are as follows.

Absorbs impurities from silica ramming mass materials. During the smelting process, certain chemical reactions occur between certain elements in the high-temperature melt and the furnace lining. Moreover, when the reaction product can be absorbed by the melt, it will cause the content of corresponding impurity elements in the metal or alloy melt to increase.

The silica ramming mass material of induction electric furnaces is mostly composed of oxides such as silicon oxide, alumina, and magnesium oxide. Because the affinity of aluminum and magnesium for oxygen is greater than the affinity of silicon for oxygen. That is, both alumina and magnesia are more stable than silicon oxide, so high alumina sand and magnesia are used to make furnace linings. Silica ramming materials are not prone to chemical interactions with the melt; when silica sand is used to make furnace linings, the possibility of chemical interactions between the melt and the silica ramming mass materials is greater. The practice has shown that when aluminum bronze is smelted in a power frequency cored induction furnace with an acidic furnace lining, scrap products containing excessive silicon content sometimes reach more than 10% due to excessive melt temperature in the melting trench.

In order to prevent chemical interaction between the melt and the furnace lining, the melting temperature should be lowered as much as possible. Mainly, silicon ramming materials of different properties should be selected according to the different chemical properties of the metal or alloy being melted. Copper, brass, silicon bronze, tin bronze, etc. should be smelted in silica sand furnaces. Aluminum bronze and low-nickel white copper should be smelted in high-alumina furnace linings or magnesia furnace linings. Alloys with a higher melting ratio should be smelted in magnesia furnace linings.

When metals such as titanium and zirconium with strong chemical activity are smelted under vacuum, they can react with almost all silica ramming mass materials and absorb impurities. Only by replacing the refractory crucible with a water-cooled copper crucible can the problem of metal contamination in the furnace lining be solved.

When using sulfur-containing gas or heavy oil as fuel, during the heating and smelting process of copper and nickel, copper, nickel and sulfur react to increase sulfur. Even absorbing trace amounts of sulfur is very harmful. For example, nickel ingots containing more than 0.0012% sulfur will crack after hot rolling.

In addition, it is also obvious that the number of remelting increases with the copper smelted under the cover of rice bran and wheat bran. The phosphorus content also increases.

Therefore, silica ramming mass materials will affect the generation of impurities during copper alloy smelting.

Damage and Maintenance of Circulating Fluidized Bed Refractories – RS Refractory Services

During the use of circulating fluidized bed boiler linings, they are greatly affected by thermal shock, erosion, wear, and oxidation spalling. Thinning of the refractory material layer in the furnace and redness of the furnace shell often occur, which leads to changes in the furnace type and affects the normal production of circulating fluidized bed boilers. Regular inspection maintenance and repair of worn parts of the furnace lining are of important means to extend the service life of the furnace lining. As an industrial kiln system service solution provider, Rongsheng Refractory Materials Manufacturer can provide a full range of refractory material services, including refractory material sales, maintenance, and the design of refractory lining materials.

Construction of Circulating Fluidized Bed Refractories

Damage and Maintenance of Circulating Fluidized Bed Refractory Materials

Repairing the lining of circulating fluidized bed boilers is a powerful measure to extend the life of the lining, balance the damage to the lining, and reduce production costs. Circulating fluidized bed boilers use refractory materials as working linings, and their service life extension and maintenance vary according to their working conditions.

(1) Medium temperature. The working temperature of each part of the circulating fluidized bed boiler lining is 800~1000℃. From the perspective of refractory materials, this belongs to the medium-temperature range. When selecting refractory materials, first consider the medium-temperature physical and chemical properties of the material. For fired products, the sintering temperature is generally higher than this temperature range, so its physical and chemical properties at high temperatures can be directly used as a basis for selecting refractory materials. For unshaped refractory materials and unfired products, the physical and chemical properties at mid-temperature must be examined. Organically bonded materials or hydration-bonded hydraulic materials tend to have the worst strength at medium temperatures. These materials produce ceramic bonds at high temperatures and their strength is greatly improved, so their physical and chemical indicators at high temperatures cannot be used as a basis for selecting refractory materials.

(2) Thermal shock. Under normal operating conditions, circulating fluidized bed boilers start and stop 2 to 10 times a year. In the early stages of operation, due to improper operation, the refractory lining was subjected to a strong thermal shock every year when it was started and stopped. If the refractory material has poor thermal shock resistance, the spalling of the refractory material caused by thermal shock will become a fatal factor in its damage.

(3) Erosion and wear. The flue gas flow rate in circulating fluidized bed boilers is high (up to more than 29m/s) and the solid material concentration is high. At medium temperatures, high-speed flue gas entrains a large number of solid particles, causing strong erosion and wear to the refractory lining. Especially in the impact zone of the cyclone, the erosion is the most serious. For circulating fluidized bed boilers and cyclones with single-side return, the cyclic flow of materials causes wear areas on the refractory lining walls.

There are three main methods for lining maintenance and repair of circulating fluidized bed boilers:

One is to directly replace the broken and worn refractory materials and re-line them. This method of repair is thorough, but the cycle is long, the workload is large, and the production shutdown time is long, which has a greater impact on the normal production of the circulating fluidized bed.

The second is to use the hard material pressing method. Hard material pressing technology is used to repair the middle and lower furnace walls of the thickened blast furnace body without lowering the material line. However, the pressing of hard materials is only suitable for the material-filled parts of the middle and lower parts of the blast furnace and is not suitable for the material-free parts of the upper part of the blast furnace and large-area furnace wall repairs.

The third is to use the gunning and lining method. This method is suitable for repairing the upper part of the blast furnace where there is no material and large areas of furnace walls. Moreover, the gunmetal lining method is easy to use, has a short cycle, and has little impact on the normal use of circulating fluidized bed boilers.

Rongsheng Refractory Material Manufacturer has a complete technical team, construction team, and customer service team. The manufacturer is strong and can select appropriate maintenance and repair methods based on customer needs and the actual condition of the furnace lining to reduce the impact of furnace lining maintenance on normal production.

It is worth mentioning that the Rongsheng refractory material manufacturer can solve the problem of refractory lining for you based on the actual production situation of your circulating fluidized bed boiler lining. When the furnace lining is damaged or falls off, you can contact us. We will provide you with detailed product introductions, on-site repair and maintenance services, and provide furnace lining usage guidance and technical support.

Through trials of Rongsheng’s wear-resistant refractory castable products, many of our customers feel that the use of our refractory lining materials has extended the service life of their kilns and reduced the time for shutdown and repair. It saves production costs and improves economic benefits for enterprises.

Advantages and Properties of Acid-Resistant Refractories – Acid Resistance

Acid resistance is the ability of refractory materials to resist acid attack. Acid-resistant refractory materials include acid-resistant bricks and acid-resistant refractory castables. Rongsheng refractory manufacturers can provide high-quality acid-resistant bricks, anti-corrosion acid-resistant carbon bricks, acid-resistant castables, acid-resistant cement, etc. Our acid-resistant refractory products are reliable in quality and perfect in service.

Acid Resistant Brick

Lightweight acid-resistant brick flue refractory brick heat insulation and acid resistance are good

The characteristics of acid-resistant bricks are anti-corrosion, high acid and alkali resistance, low water absorption, not easy to oxidize and decompose at room temperature, and not easy to be polluted by media. Acid-resistant bricks are anti-corrosion and acid-resistant materials made of quartz, feldspar, and clay as the main raw materials and fired at high temperatures in a kiln. It has the characteristics of high acid resistance, low water absorption, not easy to oxidize at room temperature, and not easy to be polluted by media. It has excellent characteristics such as strong pressure resistance, corrosion resistance, easy cleaning, and acid and alkali resistance.

Acid Resistant Cement

Acid-resistant cement resistant to high-temperature flue gas at 1000°C

Acid-resistant cement can withstand 1000°C in wet flue gas, and can also be used as a common bonding material for acid-resistant brick anticorrosion. Maybe you are not a professional in the construction industry and don’t know what acid-resistant mortar is. However, acid-resistant cement is commonly used in some industrial fields and in the process of building construction. It is an important decoration material used in many large factories or construction sites. It is also a commonly used adhesive for acid-resistant bricks in the field of chemical anti-corrosion.

Performance and characteristics of acid-resistant and heat-resistant series of acid-resistant cement anti-corrosion materials

1. Clay is a new type of anti-corrosion material with strong prestress, which is composed of potassium silicate as a binder, inorganic molecular material as a curing agent, and aluminosilicate as an acid-resistant filler.
2. The cement has high mechanical strength and excellent bonding performance. Especially in masonry granite blocks, acid-resistant tiles, porcelain plates, and cement, the bonding force is greater than that of the parent body.
3. Acid-resistant and heat-resistant materials are stable in various concentrations of organic acids and inorganic acids. Especially in dilute acid, industrial water, and neutral aqueous solution, no crystalline salt will be produced. And has high impermeability.
4. Good heat resistance, the lining in the titanium dioxide rotary kiln, the service temperature is as high as 900 ℃ ~ 1000 ℃.
5. The cement adopts a non-toxic curing agent, which is non-toxic to operators and construction personnel. Appraised by the medical and health department, it can be used in food, medicine, and other equipment anti-corrosion projects.
6. Compared with organic cement, acid-resistant, and heat-resistant materials are cheaper. It not only has the same corrosion resistance performance as organic cement but also has the unique performance of corrosion resistance to strong oxidizing medium.
7. Curing at room temperature, simple construction, convenient use, easy transportation, and moisture-proof storage.

Acid Resistant Castables

Application Advantages of RS Acid-Resistant Castables

Acid-resistant castables are castables that can resist corrosion by acidic media such as nitric acid, hydrochloric acid, sulfuric acid, and acetic acid at a temperature of 800-1200 °C. They are generally made of acid-resistant aggregates, such as silica, cast stone, wax stone, diabase, and other particles, as well as acid-resistant material powders such as waste silica bricks, silica, waste porcelain, cast stone, etc., and water glass is used as a binder. obtained castables. Good acid resistance. It is used in metallurgy, chemical industry, and other departments. However, it has poor corrosion resistance to phosphoric acid, hydrofluoric acid, and high fatty acids. The composition of acid-resistant castables mainly includes water glass, hardening accelerator, acid-resistant refractory aggregate, powder, etc. Acid-resistant refractory aggregates and powders mainly include clay, silicon, cast stone, wax stone, andesite, etc.

The advantage of acid-resistant castables is energy saving. High production efficiency. The production process of refractory castables is simple, and its production efficiency is 4 to 9 times that of refractory bricks. High construction efficiency. The construction efficiency of monolithic refractories is 6 to 15 times that of bricklaying. It can be shaped arbitrarily. It can be used to make the whole special-shaped furnace lining, and it can also be used to quickly repair the kiln to improve its service life and operation rate. Suitable for all kinds of high-temperature projects. The material can be used to prepare masonry materials with excellent heat resistance, shock resistance, harmful gas and slag corrosion, peeling resistance, and heat insulation.

Acid-resistant castables are used in industrial kilns, and acid-resistant castables can be seen in other industrial applications. Acid-resistant castables are finished products of refractory materials, and their main function is to be used in the repair of various industrial buildings. It can make reasonable repairs on the damaged parts of the kiln, so as to ensure the normal operation of the kiln. Acid-resistant castables are suitable for the repair of various special buildings and can be said to be the most widely used refractory products.

Rongsheng Refractory Material Manufacturer is a powerful manufacturer and seller of refractory materials. We provide comprehensive refractory services. Our refractory products are of reliable quality and have been sold to more than 100 countries and regions all over the world. If you are looking for acid-resistant refractory manufacturers, please contact us, we will provide samples and quotations for free.

Ceramic Fiber Rope Packing

Ceramic fiber rope is a ceramic material with dual properties. It is a multifunctional ceramic material with both fiber and ceramic properties. It is divided into several types according to different production forms. There are many types such as ceramic fiber round braid, ceramic fiber three-strand cable, and flat ceramic fiber square rope. Let me introduce to you the scope of use of ceramic fiber rope and its performance.

Ceramic Fiber Square Rope for Sale

Performance characteristics and application of ceramic fiber rope

Ceramic fiber rope, it can be used in various heat conduction systems and thermal equipment. Therefore, it must withstand the heat generated by the machine, and the continuous use temperature can also withstand about 1000 degrees. The temperature it can withstand in a short period of time is high, so it must have good fire and fire resistance. Because its thermal conductivity is relatively small, this material also has a certain thermal insulation effect in terms of heat preservation. In terms of service life, it is also relatively durable, the use time is relatively fast, and its adaptability to the environment is relatively stable. The use of some unstable weather conditions will not affect the performance of the ceramic fiber rope. Its performance will not decrease with time. During construction, its operation in use is relatively simple. It should be noted during operation that because of the fibrous material in it, it may turn black and smoke may be emitted. There are also flames in some places. But this is a normal phenomenon and will not affect the use effect.

After understanding some of the main features of ceramic fiber rope and some problems that need attention, we have a deeper understanding of ceramic fiber rope. Rongsheng Refractories Co., Ltd. has a wide range of products and various varieties. Our products are all made of good product raw materials and advanced production technology. Our company’s products are also sold in different regions, with quality assurance, and have won good reputation from our customers. If you need to purchase ceramic fiber rope products, please contact us.

Aluminum silicate ceramic fiber rope

Ceramic fiber rope is woven from high-quality ceramic fibers. It can be widely used in the chemical industry, electric power, papermaking, food, pharmaceutical, and other industries, for sealing boiler doors, high-temperature and high-pressure machines, pumps, and valves. Ceramic fiber rope is suitable for clean fluid or slurry, salt water, emulsion, oil, hydrocarbon, solvent, pulp, and other media.

Ceramic fiber rope can be divided into ceramic fiber twisted rope, ceramic fiber braided rope, ceramic fiber square braided rope, ceramic fiber round braid, ceramic fiber loose rope, ceramic fiber three-strand cable, flat ceramic fiber packing, flat ceramic fiber square rope, etc.

Ceramic fiber packing is a typical application of ceramic fiber rope.

Heat insulation and sealing of high-temperature pipelines, insulation coating of cables, and sealing of coke oven openings. Cracking furnace brick wall expansion joints, electric furnace and oven door seal, boiler, high-temperature gas seal, flexible expansion joint connection.

Ceramic Fiber Square Rope

Ceramic fiber packing and round rope

Ceramic fiber round knitting 6MM-50MM; ceramic fiber square knitting 6*6-80*80; large size round knitting can be customized according to customer requirements.

The packing of ceramic fiber twisted rope and multi-strand twisted rope is made of high-quality ceramic fiber and glass fiber or stainless steel wire. Ceramic fiber ropes are widely used in dynamic and static sealing of various high-temperature equipment. Heat preservation, heat insulation, and sealing of heat conduction system; heat insulation and sealing under high temperature and strong chemical attack environment.

Application advantages of ceramic fiber rope

1) High-temperature resistance, the continuous use temperature can reach 1000°C, and the short-term use temperature can reach 1260°C.

2) It has good resistance to acid and alkali corrosion and corrosion of molten metal such as aluminum and zinc fans.

3) Good high-temperature strength and thermal insulation performance.

4) Alkali-free glass fiber, as a series of reinforcing materials, has higher electrical insulation and high-temperature electrical insulation than glass fiber.

5) Non-toxic, harmless, and tasteless.

Typical application of ceramic fiber rope

Used as thermal insulation and heat insulation materials, it is an ideal substitute for asbestos ropes. Commonly used in various furnaces, burners, heat exchangers, and flue door seals.

Note: Ceramic fiber textiles contain about 15% organic fibers. When heated for the first time, as the temperature rises, the organic fibers in the product will gradually blacken and smoke, and local fires may occur. This is This is normal and does not affect usage. As the temperature continues to rise, the product will gradually turn white, the organic fiber has been completely carbonized, and the product is completely high-temperature-resistant inorganic materials such as ceramic fiber.

From the RS Refractory Materials Factory https://refractoriesmaterials.com/, buy high-quality ceramic fiber rope.

Is the thermal insulation performance of mullite poly light insulation brick good?

Mullite poly light insulation brick is a new type of high-quality heat insulation refractory insulation material containing 50% to 85% of AL2O3, with mullite as the dominant crystal phase and fusion phase. Because mullite has high-quality high-temperature physical properties and chemical reliability. Mullite-based lightweight bricks have high-quality properties such as high high-temperature structural strength, low high-temperature stress relaxation rate, small linear expansion coefficient, strong chemical adhesion resistance, and good thermal shock resistance. It can be used as the lining of the kiln excavation face directly touching the flame, which can significantly improve the environmental protection and energy-saving effect of the kiln.

Mullite Poly Light Insulation Brick

Insulation characteristics of mullite poly light insulation brick

The characteristics of mullite insulation brick. 1. Low heat transfer rate, with good thermal insulation effect. 2. Melt on low heat. Due to the low heat transfer rate, the mullite series lightweight concrete insulation bricks store very little energy, and the energy-saving effect is remarkable in intermittent operations. 3. Low water content in residues, with extremely low water content in compounds such as iron and alkaline earth metals. Therefore, the refractoriness is high. The higher aluminum content makes it maintain good properties in the recovery atmosphere. 4. High compressive strength in the thermal pressure test. 5. Accurate appearance and specification, speed up wall building and reduce the demand for refractory mud. The compressive strength and reliability of the infill wall are ensured, which in turn increases the service life of the lining. 6. It can be produced and processed into customized sizes and shapes to reduce the number of bricks and joints.

The high-temperature structure of mullite lightweight concrete insulation bricks has high compressive strength, good volume reliability, and high thermal shock reliability. High-quality performance indicators, which in turn increase the operating life of the kiln.

Mullite poly light insulation bricks are manufactured from high-purity mullite raw materials, with white color, high application temperature, small heat transfer coefficient, and low refiring line change rate.

Mullite lightweight concrete insulation brick can reduce the volume of insulation equipment to fill the wall, reduce its weight and shorten the heating time. Ensure uniform temperature control, reduce heat damage, save resources, improve operating conditions, and increase productivity.

Mullite lightweight concrete insulation bricks are mainly used for hot blast stove roofs, ironmaking blast furnace bodies, and bottoms, laminated glass melting furnace heat storage rooms, porcelain calcining kilns, crude oil cracking system software blind area furnace charge, etc.

Mullite poly light insulation brick is an insulation refractory product commonly used in the insulation layer of high-temperature industrial kilns. Its main function is to keep warm and reduce the heat outflow inside the kiln. Insulation bricks are usually not exposed to flames. Some high-quality mullite poly-light bricks can be applied to the working layer and can directly contact the flame. The heat transfer coefficient of insulation bricks is usually 0.2-0.4 (average temperature 350±25°C) w/m.k. It can be calculated that the thermal insulation properties of mullite thermal insulation bricks are much better. The refractoriness of insulation bricks is around 1400 degrees. Insulation bricks are generally light insulation materials, and the density is generally 0.8-1.2g/cm3.

Rongsheng insulation brick manufacturer

Rongsheng Insulation Refractory Materials Manufacturer is a powerful manufacturer and seller of refractory bricks. Our refractory brick products, and insulation brick products, are high quality and low price. And we can customize refractory lining solutions according to the actual production needs of customers’ industrial furnaces. Our new type of thermal insulation material product has a small bulk density and low thermal conductivity. It has good thermal insulation performance. It can effectively reduce the weight of the furnace body and the temperature of the outer wall of the industrial furnace. Contact us to get a detailed refractory design plan for the insulation layer for free.