Characteristics and Production Methods of Refractory Castable Prefabricated Parts

Refractory castable prefabricated parts are custom-shaped refractory products. Its shape is generally made in a separate mold according to the actual needs of the customer. Its shape and size are different, and its quality and volume are higher than those of ordinary refractory products. The material is larger in volume and more complex at the same time. Generally, refractory castable prefabricated parts are mainly used in some difficult-to-construct parts of high-temperature kilns. Moreover, after selecting refractory castable prefabricated parts, there is no need to perform baking operations, and can be directly used. So what are the characteristics of refractory castable prefabricated parts and how are they made? Characteristics of refractory castable prefabricated parts 1. The external dimensions are generally customized according to the conditions of the kiln itself, and the external dimensions are accurate. 2. No need to bake, can be put into use directly. The refractory castable prefabricated parts will be baked, cured, and other operations after molding, so we do not need to bake them on site and can be put into use directly, which can shorten the construction cycle and speed up equipment utilization; 3. Prefabricated parts of various complex shapes can be customized. Refractory castable prefabricated...

Learn More

Physical and Chemical Indicators of High Alumina Bricks

The physical and chemical indicators of high alumina bricks are important indicators that reflect the quality of high alumina bricks. They mainly include chemical composition, volume density, normal temperature compressive strength, load softening temperature, refractoriness, apparent porosity, linear change rate, and slag resistance. Wait, what are the physical and chemical indicators of high alumina bricks? 1. Chemical composition: The chemical composition mainly includes aluminum oxide, silica, iron oxide, etc. The higher the alumina content, the better the quality of the refractory bricks. 2. Volume density: The volume density of high alumina bricks is usually between 2.5-2.8g/cm3. 3. Compressive strength: It reflects the external pressure that high alumina bricks can withstand. In high-pressure environments such as high-temperature kilns, if the compressive strength of high-alumina bricks is low, it cannot provide a stable working environment for the kiln. 4. Load softening temperature: It reflects the temperature at which high alumina bricks deform under a constant compressive load at a specified temperature. 5. Refractory degree: refers to the highest possible temperature of refractory bricks. The refractory temperature of high alumina bricks is generally 1550℃-1790℃. It is an important indicator when selecting high alumina bricks for high-temperature kilns. 6. Apparent porosity: refers to the...

Learn More

Brief Process of Fire-resistant Plastic Construction

1. Before plastic construction, three connections (water connections, electricity connections, and road connections) must be ensured, the site must be level, and construction conditions must be met. 2. The construction site and equipment must be clean to prevent contamination of plastics and reduce the performance of materials. 3. The suitable environmental construction temperature for plastics is 10—30°C. Temperatures that are too high or too low will cause rapid or slow setting of plastics. 4. Plastics must be stored in a dry environment and are strictly prohibited from moisture or rain. 5. The on-board materials for plastic construction can be equipped with binders. 6. Mixing: Stir with a forced mixer. When mixing, first pour all the contents of the package into the mixer, dry mix for 2-3 minutes, then add the binding agent and stir for another 3-5 minutes, unload and pour immediately, and apply to the form. Control of the amount of binder added: 14kg of binder is added for each generation of 25kg of material to ensure that the vibration can turn the pulp. Any increase or decrease in the binding dosage will affect the construction and performance of the plastic. 7. When pouring, a plug-in vibrator should be...

Learn More

Introduction to Refractory Fiber Castables

Refractory fiber castable is a material made of refractory fiber as aggregate or filler and combined with chemical binders and admixtures. Its main feature is low thermal conductivity and its applicable temperature range is 1000~1300℃. Refractory fiber castables are widely used in medium and low-temperature thermal equipment such as heat treatment furnaces and petrochemical tubular heating furnaces. They can be used as ideal lining materials and are of great significance in improving the performance of kilns. Features and Benefits 1. Low thermal conductivity: Refractory fiber castables have extremely low thermal conductivity, which is beneficial to energy saving. 2. Easy construction: The castable has a simple preparation method and can be constructed by pouring or applying by hand. It can also be used as prefabricated blocks. 3. Wide application: Refractory fiber castables are suitable for various industrial kilns. With the promotion of lightweight and energy-saving furnace types, its application scope will be further broadened. 4. Development prospects: With the development of industrial kilns, it will become an inevitable trend to increase the variety and improve the performance of refractory fiber castables. Application areas Refractory fiber castables are widely used in the steelmaking industry, especially as a protective layer for steelmaking ladles....

Learn More

Introduction to Aluminate Refractory Concrete

Aluminate cement heat-resistant concrete is fire-hardening refractory concrete, and the cementing material is aluminate cement. The cementing material of fire-hardening refractory concrete only produces a gelling effect from cement hydration products for some time after the concrete is poured and formed, forming the initial strength of the concrete and supporting the structure itself. When the temperature rises, a series of chemical reactions occur inside the concrete at a temperature of 300 to 1200°C. The cement stone is converted from a low-density hydration product into a high-density non-hydration product (roasted product). The solid phase volume shrinks, and the solid phase As the gaps between them increase, the strength of the concrete decreases. When the temperature continues to rise and the temperature exceeds 1200°C, the solid phase material is sintered to produce a ceramic structure, and the strength is significantly increased, becoming the refractory concrete required for work. Requirements for aggregates and admixtures of aluminate cement refractory concrete 1. Aggregate. Since aluminate cement can be used to formulate refractory concrete with higher working temperatures, aggregates with higher refractoriness, such as bauxite clinker, crushed high alumina bricks, crushed magnesia bricks, and magnesia, need to be used. If the operating temperature exceeds 1500°C, it...

Learn More

Detailed Introduction to Refractory Concrete

Refractory concrete is a refractory material that is composed of refractory aggregate, refractory powder, and cementing agents or additional additives in a certain proportion. It can be used directly after stirring (the cement cementing agent should be mixed with appropriate water), shaping, and curing. Refractory aggregate is the skeleton of refractory concrete and plays an important role in the high-temperature physical and mechanical properties of refractory concrete. It has many varieties, and any raw material that can be used to make refractory bricks can be used as refractory aggregate. In addition, some industrial slag, waste refractory bricks, and natural raw materials, such as pyrophyllite, white sandstone, and zircon stone, can also be used as refractory aggregates; light aggregates mainly include ceramsite, expanded perlite, expanded vermiculite, oxidized Aluminum hollow balls, and porous clinker, etc. Refractory aggregates come in different thicknesses, and the maximum particle size is also limited. Generally speaking, the variety, particle size, and particle gradation of refractory aggregates should be selected based on the thickness of the kiln and thermal equipment, construction methods, operating temperatures, and requirements for high-temperature physical and mechanical properties. Refractory powder can improve some properties of cement binders, reduce the amount of cement, increase the...

Learn More

Introduction to Steel Fiber Wear-resistant Castables

Steel fiber wear-resistant castable is a refractory material with excellent wear resistance. It is mixed with steel fiber, refractory aggregate, binder, and other additives. The steel fiber in the steel fiber wear-resistant castable plays a reinforcing role, improving the compressive and flexural strength of the castable, and also improving the wear resistance. Steel fiber wear-resistant castable has the following characteristics 1. Good wear resistance: The wear resistance of steel fiber wear-resistant castables is much higher than that of traditional refractory castables, and it is especially suitable for parts with severe wear. 2. High compressive strength: The addition of steel fiber gives the castable high compressive strength and can withstand large mechanical loads. 3. High flexural strength: The reinforcement of steel fibers gives the castable a high flexural strength, which is beneficial to improving the stability of the structure. 4. Good thermal shock resistance: Steel fiber wear-resistant castables have good thermal stability at high temperatures and can withstand rapid temperature changes without being prone to rupture. 5. Convenient construction: Steel fiber wear-resistant castable has good fluidity, simple construction, and convenient on-site pouring. Steel fiber wear-resistant castables are widely used in high-temperature furnaces and equipment in metallurgy, mining, electric power, chemical industry,...

Learn More

Precautions for Operating Silica Brick Hot Blast Furnace

After the construction of the high-temperature kiln is completed, the oven must be dried for some time. The oven is very important for the high-temperature kiln. If the oven is not used properly, it will cause the refractory material to peel off and reduce the service life of the kiln. Therefore, in the oven, you must strictly follow the oven precautions when drying the oven correctly. Today I will take you to understand the precautions for operating a silica brick hot blast stove oven. 1. The oven is required to heat up according to the oven curve. 2. Before igniting the oven, the hot blast furnace flue valve is open and other valves are closed. During the oven, a low negative pressure needs to be maintained in the hot blast furnace (the opening of the flue valve is adjusted according to the flue gas temperature and top suction force). In the early stage of ignition, an ignition gun is used to raise the temperature. One flue valve can be completely closed and the other flue valve can be adjusted for valve opening. 3. When the gas pipeline network pressure is low, contact dispatch in time to ensure the gas supply...

Learn More

Overview of the Production Process of Refractory Castables

Overview of the Production Process of Refractory Castables Overview of the production process of refractory castables: 1. Crushing: A jaw crusher is used for the coarse crushing of raw materials, mainly used for the coarse crushing of large pieces of material. 2. Crushing: Medium and fine crushing of refractory raw materials. Equipment includes cone crushers, roller crushers, dry mills, etc. 3. Screening: Screen the crushed materials according to particle size. The equipment includes a fixed inclined screen and an electromagnetic vibrating screen. 4. Fine grinding: To produce refractory powder, the equipment includes a ball mill, tube mill vibration mill, etc. 5. Premixing: Premix powder materials such as additives, admixtures, binders, and fine powders in advance. The equipment is a double spiral conical mixer, etc. 6. Ingredients scale: Electronic weighing is generally used to ensure accurate weighing. 7. Mixing: Use a forced mixer to mix the materials. The mixture can be fed into the packaging machine and then packaged, or it can be directly packaged into bags from the outlet of the mixer. 8. Distribution and sealing: Use dispensing equipment for dispensing, and then use a sealing machine to seal the bag or tape to seal the box. 9. Finished product...

Learn More

Quick-drying Explosion-proof Refractory Castable

Quick-drying explosion-proof refractory castable is a castable material with high performance, high strength, corrosion resistance, and explosion resistance. It is mainly composed of bauxite clinker, alumina powder, aluminate, and other materials, with an appropriate amount of binders, additives, etc. Quick-drying explosion-proof refractory castables have the following characteristics: Good quick-drying performance: it can reach high strength in a short time and can eliminate a lot of moisture in a short time. Good explosion-proof performance: Because it is exposed to severe corrosive and humid environments during production and use, it has good explosion-proof performance and will not rupture or explode due to sudden temperature rise or external collision. Good fire resistance: It can withstand extreme working conditions such as high temperature and flame impact. It has good corrosion resistance and can be used in strong corrosive media such as acid, alkali, and heat. Good pouring performance: It has good fluidity and slump properties, and can well maintain the shape of the cast parts. Quick-drying explosion-proof refractory castables are widely used in the maintenance, reinforcement, renovation, and new construction of various high-temperature industrial equipment. Such as various furnaces, pipes, chimneys, boilers, and other equipment in electric power, petrochemical, metallurgy, cement, glass, paper, and...

Learn More