High-Temperature Refractory Bricks for Kilns from RS Refractory Bricks Manufacturer

High-temperature refractory bricks for kilns are a kind of high-temperature refractory material. It is usually used in the construction and maintenance of high-temperature furnaces, kilns, chimneys, and other industrial equipment. It is made of various refractory raw materials mixed in a certain proportion and then formed, dried, sintered, and other processes. High-temperature refractory bricks for kilns have excellent properties such as high-temperature resistance, chemical corrosion resistance, and wear resistance.

High-Temperature Refractory Bricks for Kilns

Classification of High-Temperature Refractory Bricks for Kilns

According to the different characteristics of refractory bricks such as materials, structures, and uses, refractory bricks can be divided into various types. Such as clay refractory bricks, high alumina refractory bricks, phosphate refractory bricks, magnesium aluminum refractory bricks, etc.

Characteristics of High-Temperature Refractory Bricks for Kilns

(1) High-temperature resistance. High-temperature refractory bricks for kilns can maintain stability in high-temperature environments. It will not soften, deform or melt, and can withstand high temperatures up to 1700°C.

(2) Chemical corrosion resistance. High-temperature refractory bricks for kilns can remain stable under the corrosion of acid, alkali, salt, and other chemical media without chemical reaction and damage.

(3) Anti-wear properties. High-temperature refractory bricks for kilns have high surface hardness and are not easy to wear and fall off.

(4) Good thermal conductivity. High-temperature refractory bricks for kilns have good thermal conductivity and can ensure uniform temperatures in the furnace.

(5) Easy to process. High-temperature refractory bricks for kilns are easy to process into products of various shapes and sizes and are suitable for the construction and maintenance of different forms of industrial equipment.

Application of High-Temperature Refractory Bricks for Kilns

High-temperature refractory bricks for kilns are widely used in kilns, chimneys, and furnaces in metallurgy, chemical industry, building materials, electric power, glass, ceramics, and other industries. Construction and maintenance of industrial equipment such as melting furnaces, heating furnaces, heat treatment equipment, glass kilns, etc.

Maintenance of High-Temperature Refractory Bricks for Kilns

(1) Periodic inspection. Regularly check the use of refractory bricks, and replace them in time if they are damaged or damaged.

(2) Avoid hot and cold changes. Refractory bricks are prone to cracking when exposed to changes in heat and cold. Therefore, after the furnace or kiln is turned off, methods such as rapid cooling or water cooling should be avoided, and a slow cooling method should be adopted.

(3) Avoid shock and vibration. Avoid knocking or impacting on the refractory bricks, so as not to damage the structure and surface of the refractory bricks.

(4) Clean up the residue. Clean up the residues and deposits on the surface of refractory bricks in time to keep the surface clean and smooth. To reduce the generation of smoke and exhaust gas.

RS High-Temperature Insulation Refractory Brick for Kiln

Application of High-Temperature Insulation Refractory Brick for Kiln

1. The working layer of various industrial furnaces, such as carbonization furnaces, cracking furnaces, tunnel kilns, industrial boilers, etc.
2. The heat insulation layer of industrial furnaces, such as heating furnaces, hot blast furnaces, etc.

There are many types of insulating refractory bricks. When selecting heat-insulating refractory bricks for industrial kilns, it is necessary to select the appropriate heat-insulating refractory bricks according to the actual operating temperature inside the kiln, the use conditions of the refractory bricks, and the service cycle. Insulation refractory bricks are used as the insulation lining of industrial kilns, and there are still differences between heat insulation refractory bricks and common refractory bricks. RS Refractory Bricks Manufacturer can provide high-quality heat-insulating refractory bricks of various specifications and materials for various high-temperature industrial kilns. According to the actual needs of customers, we can also customize the size of heat-insulating refractory bricks, kiln lining masonry, and other services. To learn more about high-temperature refractory bricks for kilns and more information about insulating refractory bricks, please contact us for free prices and samples.

Semi-Recombined Magnesia-Chrome Brick, Cr2O3 16/18/20

Semi-recombined magnesia-chrome bricks are refractory products fired with part of fused magnesia-chrome sand as raw materials. According to the production experience of refractory brick manufacturers, the main mineral composition of semi-recombined magnesia-chrome bricks is periclase, spinel, and a small amount of silicate. The particles are opacified structures, the spinel in periclase crystal is fully developed, and the matrix part is a metasomatic dissolved turbid structure. The intercrystal is a direct combination of periclase-perclase or periclase-spinel, and the silicate phase exists in an isolated state between the crystal grains. Semi-rebonded magnesia chrome brick, chrome 16/18/20. High-temperature resistance, alkaline refractory material for copper smelting furnace. The thermal shock resistance of semi-recombined magnesia-chrome bricks is better than that of directly bonded magnesia-chrome bricks.

Semi-Recombined Magnesia Chrome Bricks

The manufacturing process of semi-recombined magnesia-chrome bricks. The fused magnesia-chrome material is used as particles, and part of chrome ore and magnesia are added or sintered to form magnesia-chrome material as fine powder, and bricks are made according to the conventional process. Fused magnesia-chromium material should be smelted in a weak oxidizing atmosphere, there should not be many reducing phases in the material, and metal iron and chromium should be avoided. The magnesia and chromite used as fine powder must be co-ground, and the fineness should be guaranteed to be less than 0.088mm, accounting for more than 95%. It is formed by a high-tonnage brick press, and the brick density is greater than 3.2g/cm3. After the adobe is dried, the kiln moisture is less than 1.0%. The products are fired in a tunnel kiln, the firing temperature is above 1750°C, and a weak oxidizing atmosphere is maintained in the kiln.

Characteristics and application of semi-recombined magnesia-chrome bricks. Semi-rebonded magnesia-chrome bricks are dense, have low porosity, high-temperature strength, thermal shock resistance is better than rebonded magnesia-chrome bricks, and have strong slag erosion resistance. It can be used in vulnerable parts of steelmaking electric furnaces, RH, and DH vacuum degassing devices. VOD, LF, ASEA-SKF, AOD, and other secondary refining slag lines and other severely eroded parts. Tuyere area of copper smelting converter, firing zone of cement rotary kiln, and regenerator of glass melting kiln.

Semi-recombined magnesia-chrome bricks have lower cost and better thermal shock resistance than recombined magnesia-chrome bricks with comparable composition. In a certain range, it can replace recombined magnesia-chrome bricks.

Fused and rebonded magnesia-chrome bricks have a high softening temperature under load, and magnesia refractory bricks are used in the high-temperature zone of the refining furnace

Magnesia-chrome bricks are mainly composed of magnesium oxide (MGO) and chromium oxide (CR2O3). Magnesia Carbon Brick Price. Periclase and spinel are refractory products with main mineral components. This type of brick has high refractoriness, high-temperature strength, strong corrosion resistance to alkaline slag, excellent thermal stability, and certain adaptability to acid slag. The main raw materials for making magnesia-chrome bricks are sintered magnesia and chromite. The purity of magnesia raw material should be as high as possible, and the chemical composition requirements of chromite are CR2O3: 30~45%, CAO: ≤1.0~1.5%.

Salt-Soaked Magnesia Chrome Brick

Magnesia-chrome bricks (https://rsrefractoryfirebrick.com/magnesia-chrome-brick/) are mainly used in the metallurgical industry, such as building open hearth furnace roofs, electric furnace roofs, refining furnaces outside furnaces, and various non-ferrous metal smelting furnaces. The high-temperature part of the ultra-high-power electric furnace wall adopts fused-cast magnesia-chrome bricks. Magnesia-chrome bricks made of synthetic materials are used in the high erosion area of the refining furnace outside the furnace. The high erosion area of non-ferrous metal flash smelting furnaces adopts fused cast magnesia-chrome bricks and magnesia-chrome bricks made of synthetic materials. In addition, magnesia-chrome bricks are also used in the firing zone of cement rotary kiln and the regenerator of glass kiln.

In order to reduce the porosity of magnesia-chrome bricks and improve their slag resistance, the process of immersing magnesia-chrome bricks in salt is generally used in actual production. The process requires that the selected salt will not cause new pollution to the smelted metal, and will not pollute the environment as much as possible. Nor should it adversely affect the properties of the material. Since the magnesium salt decomposes at a certain temperature, only MGO remains in the pores of the brick, which will not adversely affect the high-temperature performance of the brick.

Magnesia-chrome bricks have good corrosion resistance and toughness and can withstand high temperatures in non-ferrous smelting

With the continuous development of the non-ferrous metallurgical industry, taking the flash furnace as an example, its requirements for refractory materials are also increasing. Directly bonded magnesia-chrome bricks and high-quality magnesia-chrome bricks such as fused cast magnesia-chrome bricks, fused-rebonded magnesia-chrome bricks, and semi-rebonded magnesia-chrome bricks. And fully synthetic magnesia-chrome bricks have gradually become the mainstream of development. The bottom, wall, and roof of the reverberatory copper smelting furnace are generally built with basic refractory materials such as sintered magnesia bricks, magnesia-alumina bricks, and magnesia-chrome bricks.

Rongsheng Magnesia Chrome Bricks Manufacturer

Zhengzhou Rongsheng Kiln Refractories Co., Ltd. is a national high-tech enterprise integrating R&D and production of refractories, engineering construction, and technical services. Rongsheng Refractories is committed to providing high-performance products and system solutions for the global high-temperature industry. The main business is R&D and production of refractory bricks and unshaped refractory materials and undertakes the overall contracting business such as optimized installation of refractory materials for various thermal equipment, masonry construction, and professional ovens.

At present, Rongsheng has a production line with an annual output of 80,000 tons of shaped refractory materials and an annual output of 50,000 tons of unshaped refractory materials, all of which are fully automatic and intelligent production lines. The products cover heavy-weight shaped, unshaped, light-weight shaped, unshaped, and other series. Widely used in electric power, metallurgy, non-ferrous metals, petrochemical, building materials, and other fields. And exported to more than 80 countries and regions such as Europe, America, Africa, Oceania, Southeast Asia, and the Middle East. At the same time, we have set up sales and service outlets in more than 30 countries and regions around the world to provide global customers with refractory products and services with reliable quality and stable performance.

Lightweight Thermal Insulation Bricks Manufacturer for High Temperature Ceramic Kiln Equipment

Rongsheng lightweight insulation refractory material manufacturer produces and sells JM23 26 28 30 thermal insulation bricks and various refractory bricks for glass kiln ceramic kilns Lightweight thermal insulation bricks, mullite bricks, thermal insulation, and low thermal conductivity. Whether in product quality, product price, or customer service. Rongsheng manufacturers have a very complete team to serve each of our customers. Lightweight insulating refractories have been widely used in modern ceramic kilns. Some use lightweight insulation bricks alone, some use refractory fibers alone, but most of them are used in combination. Due to the lightening and thinning of the kiln wall masonry, the kiln structure is more scientific and modern. Because of the good heat preservation effect of the kiln, it is easier to control the heating and cooling of ceramics during firing. The firing cycle is greatly shortened, and a remarkable energy-saving effect is achieved.

JM23 Mullite Insulation Bricks

Lightweight thermal insulation refractory material, which is based on low thermal conductivity, by increasing the pore content in the thermal insulation material, the refractory masonry has low bulk density, low volume thermal melting, and low thermal conductivity. Thereby realizing a high thermal resistance function. The adoption of lightweight heat-insulating refractory materials has changed the traditional concept of ceramic kiln structure. For example, the hoisted flat roof structure makes the kiln section wider and shorter. The suspended flat roof also changes the mechanical structure of the vaulted roof of the kiln. The masonry load falls on the steel frame of the kiln roof so that the thrust load of the two side walls is zero.

Lightweight heat-insulating refractory materials are transformed from traditional heavy refractory materials. Heavy refractory materials have strong high-temperature load resistance, but their thermal melting and thermal conductivity are high, and the kiln wall thickness is large, so the heat storage is large and the heat dissipation is serious, which wastes a lot of energy. The characteristics of lightweight heat-insulating refractory materials are a certain high-temperature load capacity, good thermal shock resistance, airflow erosion resistance, small heat capacity, low thermal conductivity, and good heat insulation effect.

Lightweight thermal insulation bricks, lightweight clay thermal insulation refractory bricks, light weight bricks for high-temperature ceramic equipment, thermal insulation bricks, factory direct sales, low prices. https://rsrefractoryfirebrick.com/cheap-fire-bricks-for-sale/ There are two main methods of forming lightweight insulation bricks. One is to add burnable chemical fillers and uses plastic molding, which is called polymer pore-forming lightweight bricks. The other is to finely crush the raw materials and remove iron, then add a binder and a foaming agent to make a slurry, use warm casting to form, and then quickly dry and burn. For example, mullite lightweight bricks are often formed by the latter method, which has the characteristics of well-compressive strength at room temperature, low thermal conductivity, and small shrinkage after refiring. The bulk density of mullite lightweight insulation bricks has specifications such as 1.0g/cm, 0.8 g/cm, and 0.6 g/cm. The key to the production of lightweight heat-insulating refractory bricks lies in the use of finely dispersed high-quality raw materials and strict sieving and iron removal processes. Increase the closed porosity to increase the high-temperature load capacity while improving the heat insulation effect.

The main components of ceramic fibers are usually alumina and silica. The raw material is melted at a high temperature to form a fine column, which is blown into fine fibers by high-pressure jet gas, with a diameter of several microns. Ceramic fiber can be divided into high siliceous fiber (use temperature 1100°C), aluminum silicate fiber (use temperature 1250°C), alumina fiber (use temperature 1400°C), zirconia fiber (use temperature 1600°C). Ceramic fibers are characterized by low bulk density, low volume thermal melting, and low thermal conductivity. Its biggest shortcoming is poor thermal stability, large shrinkage due to re-burning and crystallization, stress in the internal structure and even cracking and pulverization. Ceramic fibers have been widely used as ceramic kiln linings, processed into folded modules or fiber mats. Blown ceramic fibers mainly exist in an amorphous glass state, which will transform into a regular crystalline state at high temperatures. The formation of mullite crystals can be observed in alumina fibers that have been heat-treated at 1000 °C. However, the devitrification of ceramic fibers occurs above 1200 ° C. At this time, sintering hardening occurs on the surface of the fibers, which can improve the ability to resist flame erosion and fine particle abrasion. When the actual temperature exceeds its service temperature, the fiber will lose its elasticity and break, making it void.

The effectiveness of ceramic fibers in kilns depends on their thermal insulation properties. For example, for fiber lining with a thickness of 125mm, when the heating surface is 870°C, the temperature of the cold surface should be lower than 80°C. In modern ceramic kilns, ceramic fibers can be directly used on the flame-washed surface in order to minimize the thickness of the kiln body, increase thermal resistance, and reduce the heat storage and heat dissipation of the kiln body.

Rongsheng refractory brick (https://rsrefractoryfirebrick.com/) production and sales manufacturer, lightweight thermal insulation refractory brick t-3 ceramic kiln with mullite high alumina poly light brick, heat insulation, and high-temperature resistance. Contact us for free prices and samples.

Choosing the Right Anti-Spalling High Alumina Bricks for Your Rotary Kilns

Rotary kilns are widely used in various industrial applications, such as cement production, metallurgy, and chemical processing. These high-temperature processing vessels rely on refractory materials to withstand extreme heat and chemical exposure, and anti-spalling high alumina bricks have become a popular choice for their superior resistance to thermal shock and spalling.

High-Quality Anti-Stripping High-Alumina Bricks

However, choosing the right anti-spalling high alumina bricks for your rotary kilns requires careful consideration of various factors, such as the operating temperature, mechanical stresses, and chemical environment. In this essay, we will discuss some of the key considerations when selecting anti-spalling high alumina bricks for rotary kilns.

First and foremost, the operating temperature of the rotary kiln is the primary factor that determines the type of anti-spalling high alumina bricks to use. High alumina bricks typically have an alumina content of 50% to 90%, and the higher the alumina content, the higher the refractoriness and thermal shock resistance. For instance, if your rotary kiln operates at a temperature above 1500°C, you may need to choose high-alumina bricks with alumina content above 75%.

Anti-Stripping High-Alumina Refractory Bricks

Another important consideration is the mechanical stresses that the anti-spalling high alumina bricks will face during the operation of the rotary kiln. The bricks may undergo thermal expansion and contraction, which can lead to cracking or deformation. Thus, it is essential to choose anti-spalling high alumina bricks that can withstand such stresses without compromising their structural integrity. One approach is to use high-density bricks, which have lower porosity and better mechanical strength.

The chemical environment of the rotary kiln is also a critical factor to consider when selecting anti-spalling high alumina bricks. The kiln may expose the bricks to various chemical species, such as alkaline or acidic gases and molten slag. These substances can react with the bricks and cause corrosion or erosion, leading to spalling or failure. Therefore, it is crucial to choose anti-spalling high alumina bricks that can resist the specific chemical environment of your rotary kiln. For instance, if your kiln operates in an acidic environment, you may need to choose bricks with a high content of silica or zirconia.

Anti-Flaking High Alumina Bricks Used in Rotary Kilns

Furthermore, the shape and size of the anti-spalling high alumina bricks can also affect their performance in the rotary kiln. The bricks must fit snugly and uniformly into the lining to minimize gaps or cracks, which can lead to heat loss or hot spots. The choice of brick shape and size may also affect the ease of installation and maintenance, as well as the overall cost.

In conclusion, selecting the right anti-spalling high alumina bricks for your rotary kilns requires careful consideration of several factors, including the operating temperature, mechanical stresses, chemical environment, shape, and size. By taking these factors into account, you can ensure that your rotary kiln operates efficiently and safely, with minimal downtime and maintenance costs.

Refractory Bricks Used for the Construction of Shuttle Kiln with Maximum Temperature 1500℃

A shuttle kiln is a kind of kiln car type inverted flame kiln, its structure is basically similar to the traditional rectangular inverted flame kiln. The general principle of refractory material selection of shuttle kiln is to use full thermal insulation refractory material, that is, the kiln body, kiln car, and kiln lower flue are all made of lightweight refractory materials. In addition, because the shuttle kiln operates intermittently, it requires rapid heating, rapid firing, and good temperature uniformity. In order to achieve fast firing and reduce energy consumption, it is necessary to reduce the heat storage of the kiln body and the kiln car. The kiln car has less heat storage, and the temperature uniformity in the kiln is good. Refractory Bricks Used for the Construction of Shuttle Kiln with Maximum Temperature 1500℃. In order to reduce the concrete volume of the basic part of the kiln body, light refractory materials are also used in the flue part abroad. Because of the use of heavy refractory materials, the masonry will inevitably increase, and the size of the foundation part will also increase. In addition, the use of light refractory materials can also ensure that the temperature of the flue gas decreases less during the low-temperature heating stage of the kiln, and achieves the effect of reducing energy consumption.

RS Mullite Insulating Fire Bricks

Refractory Bricks Used for the Construction of Shuttle Kiln

When the kiln wall, kiln roof, and kiln door of the prismatic kiln are built with light mullite bricks, gas-hardening refractory mud is often used for masonry. This mud requires good masonry properties. It is required to ensure a suitable construction time, generally 90~120s, and to start hardening after a period of construction. In order to produce good normal temperature (or low temperature) bonding strength, the requirement can reach more than 0.5MPa. At the same time, it also needs to be able to be used in the temperature range of 1000~1600 °C.

The material of kiln roof bricks is alumina hollow ball bricks. Hollow ball bricks are widely used in high-temperature kilns because of their high softening temperature under load, good strength, and excellent thermal shock resistance. Under the requirement of high-temperature conditions, the kiln roof of a high-temperature kiln should try to choose materials with good thermal shock performance, excellent thermal insulation performance, and lightweight. In order to enhance the thermal shock resistance of the kiln roof and reduce the load of the kiln wall.

Alumina Bubble Brick Insulating Bricks

Lightweight refractory bricks for shuttle kilns also require good thermal stability. The change rate of the reburning line at the safe use temperature is small, and the thermal conductivity meets the performance requirements.

Judging from the current situation, light refractories for shuttle kilns, especially for high-temperature shuttle kilns (1500~1800℃), mostly use light refractories. The inner kiln wall of the shuttle kiln is made of light refractory bricks with better resistance to rapid cooling and rapid heating. The exterior is insulated with aluminum silicate fiber products, calcium silicate boards, rock wool, and other thermal insulation materials. The inner surface of the thermal insulation layer can be pasted with 50mm thick high temperature resistant refractory fiber to prolong the service life of the thermal insulation and thermal insulation materials. In order to improve the strength and air tightness of the kiln, the outside of the kiln wall is often wrapped with a layer of 3-5mm thick steel plate. The modern all-refractory fiber shuttle kiln uses refractory bolts to fix the refractory fiber blocks directly on the inner side of the metal shell.

Do a good job of insulation layer for the shuttle kiln, and choose the appropriate insulation brick material for the top material. At the same time, in order to meet the production needs, the strength and air tightness of the kiln are improved. RS refractory brick manufacturers can provide high-quality thermal insulation brick products, such as alumina hollow ball bricks and other refractory bricks used for the construction of shuttle kilns. To learn more, please search https://rsrefractoryfirebrick.com/. Click to learn more.

Learn about the Refractory Castable Lining Skeleton – Refractory Anchors

Anchors are non-metallic or metal parts installed on the furnace shell or the steel structure supporting the lining, and are embedded in the lining to act as anchors and connections, and are called refractory anchors. It is an important part of modern monolithic refractory linings and a key technical measure to improve the service life of linings.

RS High-Quality Anchor Bricks for Sale

Refractory anchors are divided into two categories: metal anchors and non-metal anchors. These include supports, thrusters, and anchor nails. Hanging bricks are also anchoring bricks. The technical requirements for refractory anchor bricks are high strength and good thermal stability. Therefore, three-level clinker is generally used as the raw material and fired at high temperatures. For example, the chemical composition of high alumina anchor bricks in a certain factory is Al2O3≥50% and SiO2≥46%. The refractoriness is 1750℃, the strength is 3.8MPa, and the linear expansion coefficient at 1200℃ is 5.8X10-6K-1. At 1450℃, the re-burning linear change is +0.1%, and the load softening start temperature is 1430℃.

There are various shapes and connection methods of anchor bricks( https://rsrefractoryfirebrick.com/refractory-anchor-brick/ ), and their sizes are also different. The most commonly used anchor bricks have lengths of 330, 380, 440, and 500 mm, and the thickness is generally about 100 mm. It is mainly used for refractory castable linings. In refractory plastic linings, shapes without holes are generally used.

Metal anchors are generally made of ordinary steel, heat-resistant steel is the best, but it increases the cost of thermal equipment. Metal supports and thrusts are generally made of heat-resistant cast steel.

Metal anchors are easily oxidized at high temperatures, so they should be buried in the lining. The distance between the hot end and the working surface of the lining body depends on the thickness of the attached body and the operating temperature, generally 20-200mm.

Metal anchors are generally welded to the furnace shell and have various shapes. The most commonly used shapes are Y, V, L. There are also several shapes of support and thrust. The former is used in higher furnace walls, and the latter is used in furnace roofs with steep slopes.

The installation holes or necks of the anchor bricks shall not have cracks and the dimensions shall be accurate. The welding between the metal anchor and the furnace shell shall be fully welded, and no false welding or missing places shall be allowed. The dimensions should also be accurate. Ceramic fiber blankets and metal anchors for refractory fiber linings are also available in various shapes and sizes. Its function is mainly to fix the refractory fiber lining body.

Customized Refractory Anchor Bricks – Professional Production of Anchor Bricks

Rongsheng refractory materials‘ manufacturer not only provides customers with various types of standard refractory bricks but also can customize the size of refractory bricks to meet customer needs according to the specific needs of customers. Similarly, for a variety of anchor products, thermal insulation products, and the skeleton structure of refractory castable lining-refractory anchor brick products, we can customize high-quality products and services for customers according to their specific needs. If the refractory lining of your thermal furnace equipment needs to be repaired or you want to purchase refractory products, please contact us. We will provide you with the most satisfactory service according to your specific needs. We will be your satisfied supplier.

Corrosion Causes and Loss Mechanism of Magnesia Carbon Bricks in Electric Furnace Lining

The inner side of the electric furnace lining carries high-temperature slag liquid, and the discharge of the high-temperature molten liquid will cause the temperature of the furnace wall to drop sharply, causing the refractory material of the furnace lining to withstand the thermal shock of sudden cooling and heating. In addition, the electric furnace lining has to withstand the chemical corrosion of molten slag and the oxidation corrosion of contact with air during the process of the liquid level drop. Therefore, the selection of refractory materials for furnace lining is very demanding. Next, the refractory bricks manufacturer will take you to understand the corrosion and wear mechanism of the electric furnace lining during normal use.

Rongsheng High-Quality Magnesia Carbon Bricks

What are the reasons for the corrosion of the electric furnace lining during normal use?

During normal smelting, the furnace lining is in direct contact with high-temperature molten steel and molten slag, and the working conditions are very harsh. There are reasons for the damage to the lining.

• (1) Thermal spalling and high-temperature chemical corrosion caused by arc radiation.
• (2) The scouring effect of molten slag, molten steel, and furnace gas on the furnace lining.
• (3) The chemical attack of molten slag on the furnace lining.
• (4) Peeling caused by temperature changes.
• (5) Spalling caused by the decomposition of the mineral composition of the lining brick itself.
• (6) The mechanical impact and erosion of the furnace lining when adding scrap steel and adding molten iron.

What is the loss mechanism of electric furnace lining magnesia carbon brick?

General magnesia-carbon bricks are made of high-quality magnesia with high-purity graphite, silicon, silicon carbide, and other additives, and phenolic resin as a binding agent. The basic requirements of the electric furnace for magnesia carbon brick are.

• (1) The thermal conductivity is low to ensure less heat loss and improve the thermal efficiency of the electric furnace.
• (2) High thermal chemical and thermal physical corrosion resistance coefficient, which requires good volume stability.
• (3) Slag resistance, peeling resistance, oxidation resistance, and high compressive strength, so as to obtain low consumption and long life.

When baking a new lining, the following main reactions will occur when the lining temperature reaches 750°C:

The above reaction 1 is mainly the generated magnesium gas and carbon monoxide gas migrate along with the pores to the high-temperature zone. Reaction 2 is that the magnesium gas on the surface of the furnace wall is oxidized to magnesium oxide by terbium again, and forms a high-melting petrographic compound with other trace compounds in the magnesia carbon brick. Therefore, controlling the temperature system of the oven to prevent a large amount of reaction 1 is the key to maintaining the volume stability of the magnesia carbon brick (https://rsrefractoryfirebrick.com/magnesia-carbon-bricks/). This is very important whether in the converter or the electric furnace. The direct consequence of the failure of the oven is the collapse of the furnace lining or the drastic reduction of the life of the furnace lining. This point has a lot of experience and lessons in most domestic manufacturers.

Application of Lightweight Mullite Brick in Electric Melting Glass Kiln

Lightweight mullite bricks are made of high alumina bauxite clinker as the main raw material, and a small amount of clay or raw bauxite is added as a binder. It is made after molding and firing.

Performance Advantages of Lightweight Mullite Bricks Applied to Kilns

Lightweight mullite brick products have very low thermal expansion coefficient, high thermal conductivity, good thermal shock resistance, and high temperature strength. It will not be softened after long-term use at high temperature, will not be corroded by any acid and alkali, and has good salt resistance. It is also not wetted by metal and molten slag, and it is a high-quality high-temperature resistant material.

Features of Lightweight Mullite Brick

1. Low thermal conductivity and low heat capacity.
2. High purity and low impurity content.
3. High temperature resistance, can directly touch the flame.
4. High strength and excellent thermal shock resistance.

Application of Lightweight Mullite Bricks in Glass Electric Melting Kiln

Lightweight mullite brick hanging hanger has an absolute advantage in performance. At present, the construction of electric melting kilns with a melting area of more than 8m2 has basically adopted lightweight mullite bricks as the roof structure. The following analyzes the future development direction of hanging chute from two aspects of small electric melting furnace and large electric melting furnace.

1. Application of Lightweight Mullite Brick Hanging in Small Electric Furnace

Small electric glass melting kiln, (melting area 1-8m2 less than 1m2 is not in the scope of this article.) Hanging structure can be used. At present, some domestic manufacturers have used it, but it has not been fully popularized. With the reduction of material costs and people’s emphasis on resource reuse, it is believed that there will be more space for the use of hanging slings in small electric melting furnaces.

2. Application of Lightweight Mullite Brick Hanging Hanging in Large Electric Furnace

With the gradual development of electric melting furnaces in the direction of large melting areas (melting areas greater than 20m2) in recent years, new challenges have also been raised for the design of hanging hangings. The increased area of the hanging hanging means an increase in weight. In order to ensure the reusability of the hanging chute, the Rongsheng refractory manufacturer adopts a split hanging chute structure. Divide each block body into 3 parts, and each part can be separated and hoisted separately when loading and unloading.

Learn more about refractory bricks for sale for kinds of kilns, such as glass kilns, steel ladle furnace, etc.

Material Change and Development of the Runner Bricks

Runner bricks refer to the hollow refractory bricks that are laid in the groove of the ingot base plate to connect the king brick and the ingot mold. Runner bricks are generally hollow in a rectangular parallelepiped of various specifications.

Runner bricks have higher requirements because they need to be in direct contact with high-temperature molten steel. The production process of runner bricks should be particularly rigorous, because if the quality is not good enough, it will easily affect the molten steel in contact with it.

Material Development of Runner Bricks

Generally, runner bricks are made of high alumina and corundum, so their refractoriness is also high, generally not lower than 1580°C. The actual use temperature can sometimes reach above 1630°C. In the past, there were still more production of clay runner bricks. However, with the ever-increasing requirements for steel quality, higher requirements are put forward for steel purity. Nowadays, almost no clay runner bricks are produced.

In recent years, more mullite runner bricks have been produced, and almost no clay bricks have been produced. Because the surface pores of high alumina bricks are relatively large and the structure is relatively loose, the surface pores of mullite bricks are fine and dense and the surface has needle-like crystals, showing a network cross structure. This kind of cross-dense structure can hinder the further erosion of the steel brick by the molten steel. In contrast, in the process of flowing molten steel, molten steel will easily react with the refractory material made of high alumina bricks.

The Influence of Runner Brick on the Steel Purity

Runner bricks are usually used in bottom casting and pouring steel. The reasons that affect the purity of steel are mainly divided into two categories.

• One is caused by steelmaking operations.
• The second is caused by refractory materials used in steelmaking, such as runner bricks. When the molten steel flows from the molten steel tank to the ingot mold, it must pass through the runner bricks. Due to the high temperature of the molten steel, the runner brick will be impacted, which will cause the partial fall of the runner brick structure. At the same time, the molten steel will also interact with the runner bricks, and the reaction products will be mixed into the molten steel, affecting the quality of the steel ingot.

Application of Runner Bricks

Runner bricks are widely used in flat pouring steel of various steel grades (including stainless steel and various alloy steel). The product has high refractoriness, good chipping resistance and strong corrosion resistance. In order to reduce the resistance during the flow of molten steel and prevent leakage, the runner bricks are required to have smooth inner holes, regular appearances and tight joints.

Therefore, in recent years, the production of runner bricks has basically been made of mullite. Generally divided into five categories, such as low mullite, mullite, mullite-corundum, corundum-mullite and corundum. Rongsheng refractory brick manufacturer, to provide you with a complete range of runner bricks, welcome your inquiry, Email: Sales@rsrefractoryfirebrick.com .

How Should the Kiln Bricks be Classified and Selected According to Acidity and Alkalinity?

When selecting kiln refractory bricks, its acidity and alkalinity should be considered. Common refractory bricks are some high melting point oxides. According to their chemical properties, they can usually be divided into three categories: acidic, alkaline, and neutral.

The main components of acid refractory bricks are acid oxides such as SiO2, such as silica bricks. The main components of alkaline refractory bricks are alkaline oxides such as MgO and CaO, such as magnesia bricks. The main components of neutral refractory bricks are amphoteric oxides such as Al2O3 and Cr2O3, such as clay bricks and high alumina bricks.

Most kilns can use neutral refractory bricks https://rsrefractoryfirebrick.com/kiln-bricks-for-sale/, such as high alumina bricks, clay bricks, and mullite bricks. Cement kilns and lime kilns use more alkaline refractory bricks.

Acidic refractory bricks are easily eroded by reacting with alkaline substances at high temperatures. Alkaline refractory bricks are susceptible to corrosion by acidic substances at high temperatures. However, neutral refractory bricks produce a chemically inert variant due to amphoteric oxides such as Al2O3 and Cr2O3 after being burned at high temperature, which is not easy to interact with acidic substances or alkaline substances. Therefore, the performance of resistance to acid and alkali is better.

When choosing refractory bricks, attention should also be paid to the oxidation-reduction properties of furnace gas. If the furnace gas contains a lot of CO, CO can easily interact with some metal oxides (such as FeO) in the refractory bricks to reduce the metal at high temperatures. Carbon deposition in the gaps between the refractory bricks will also cause the strength of the refractory bricks to decrease and break. Therefore, this refractory brick requires iron oxide content below 3% (called an anti-carburizing brick). For another example, refractory bricks containing Cr2O3 (melting point 2266°C) can be used in an oxidizing atmosphere at high temperatures. If used in a reducing atmosphere, it may be reduced to metallic chromium (melting point 1857°C).

For more information about refractory bricks for kilns, please visit our website: https://rsrefractoryfirebrick.com/.