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Rotary kiln is an important production equipment, mainly used in cement, steel, chemical, and other industries. For the selection of rotary kiln lining materials, both castables and refractory bricks can be used. Here is a comparison of the two materials: Casting Material Casting material refers to the material that is poured into the lining mold after mixing the materials. Its advantages include that it can meet the needs of various shapes, can reduce brick joints, has wear resistance and impact resistance, and is easy to use. However, the production of castables requires a high level of technology, and the consistency of material properties is difficult to ensure, so the production process needs to be carefully controlled to ensure the stability of material quality. In addition, castables have a relatively short service life and need to be replaced frequently. Refractory Brick Refractory brick is a material made of bricks fired at high temperatures. Its advantages include good high-temperature stability, high mechanical strength, strong corrosion resistance, etc., and can be used for a long time. However, the production and installation of refractory bricks require certain skills and experience, and the shape and size of the bricks are fixed, so correct measurement and...
Mechanical grate incinerator is a common solid waste treatment equipment, which achieves purification and environmental protection by burning waste and treating flue gas. The working principle of a mechanical grate incinerator can be summarized as the following steps: Waste feed: Waste is fed into the incinerator through the feed port. Mechanical grate: A mechanical grate is installed in the incinerator, and the waste is pushed into the furnace by a mechanical device. Ignition: The igniter ignites the waste in the furnace and the pilot fuel begins to burn. Air duct introduction: the heat generated by the combustion in the furnace is introduced into fresh air through the air duct in the furnace to enhance the combustion effect. Fly ash separation: After the waste is burned, a large amount of ash will be produced, and the fly ash will be separated by the fly ash separation device in the equipment. Flue gas purification: The flue gas contains a large number of harmful gases and particles, which need to be treated by the purification device in the equipment to reduce environmental pollution. Emission: The purified flue gas is discharged into the atmosphere to complete the waste treatment process. In general, the working...
Looking for a professional refractory castable manufacturer Comprehensive strength: Choose a refractory castable manufacturer with strong comprehensive strength, including production equipment, technical team, and quality control system. These factors directly affect the quality and stability of the product. Technology research and development capabilities: The research and development and innovation capabilities of refractory castables are important indicators for evaluating the level of manufacturers. An excellent manufacturer should have a strong R&D team and laboratory facilities, and be able to provide customized product solutions according to customer needs. Qualification certification: Refractory castable manufacturers should have relevant qualification certifications, such as ISO9001 quality management system certification, ISO14001 environmental management system certification, and OHSAS18001 occupational health and safety management system certification. These certifications can prove that the manufacturer has a certain level of management and product quality assurance capabilities. Inspect product quality and performance Composition and formula: The composition and formula of refractory castable directly determine its performance such as temperature resistance, wear resistance and chemical corrosion resistance. When choosing a manufacturer, you should pay attention to the ingredients and formula of its products, compare them with other manufacturers, and choose the product that is most suitable for your engineering needs. Technical parameters: Knowing...
As an important building material, refractory castable has the characteristics of high-temperature resistance, wear resistance, and chemical corrosion resistance, and is widely used in metallurgy, chemical industry, electric power and construction, and other fields. This article will introduce the definition, characteristics, and application of refractory castables in different fields. 1. Definition and characteristics of refractory castables Refractory castable is a building material with high-temperature durability prepared based on refractory materials through appropriate formulas and processes. Its main features include: High-temperature resistance: refractory castables can maintain stable physical and chemical properties in high-temperature environments, and are not easily affected by thermal expansion, melting, or burning. Wear resistance: Due to the high hardness and wear resistance of refractory castables, they can effectively resist mechanical wear and friction and prolong the service life of the equipment. Chemical corrosion resistance: Refractory castables are not easily corroded by acids, alkalis, salts, and other chemical substances, and can maintain stable performance in corrosive media. 2. Application fields of refractory castables Metallurgical industry: In metallurgical furnaces, converters, electric furnaces, and other high-temperature equipment, refractory castables are widely used as lining materials to protect equipment from high temperature and chemical substances. Chemical industry: Refractory castables are used in...
The fluidized furnace is a special industrial furnace. Its working principle is to mix materials and gas at high temperatures and form a gas-solid two-phase flow in the furnace, so as to achieve the technical purposes of drying, pyrolysis, and calcination. In order to ensure the normal operation of the fluidized furnace, various parts need to use different types of refractory materials. The following is an introduction to the refractory materials used in various parts of the fluidized furnace. Furnace: The furnace is the core part of the fluidized furnace, and the refractory materials used in it need to have the characteristics of high refractoriness, high corrosion resistance, and high mechanical strength. Commonly used refractory materials include high alumina, silicate, and silicon carbide. Among them, high-alumina refractories have the characteristics of high refractoriness, high mechanical strength, and high thermal stability, and are one of the commonly used furnace materials. Dispersion plate: The dispersion plate is an important part of the fluidized furnace, and the refractory material used in it needs to have good wear resistance and heat resistance. Commonly used refractory materials include high alumina and silicon carbide. Nozzle: The nozzle is the key part of gas injection and gas...
The characteristics of refractory bricks for hot blast stoves mainly include the following aspects: High-temperature resistance: the working temperature of the hot blast furnace is generally above 1000 ℃, and the refractory brick has excellent high-temperature stability and can be used stably for a long time in a high-temperature environment without problems such as falling off and cracking. Thermal shock resistance: During the working process of the hot blast furnace, the temperature changes rapidly, while the refractory brick has good thermal shock resistance and can withstand the stress caused by rapid temperature changes without cracking or cracking. Wear resistance: The working conditions of hot blast stoves are relatively harsh, and there are erosion and wear of particles, smoke, burning substances, etc., while refractory bricks have excellent wear resistance and can maintain stable surface hardness and strength for a long time. Chemical erosion resistance: There are acidic or alkaline gases, liquids, and other media in the hot blast stove. These media have a corrosive effect on refractory materials, while refractory bricks have excellent chemical erosion resistance and can be used stably for a long time under the erosion of these media. Construction convenience: refractory bricks are easy to construct, can be...
The steps to replace high alumina refractory bricks are as follows: 1. First lower the temperature of the furnace to room temperature and stop burning. 2. Then break the original high alumina refractory bricks and remove the residue. 3. Prepare new high-alumina refractory bricks and cut them into appropriate shapes and sizes as required. 4. Place the new high alumina refractory bricks in the corresponding position in the furnace. 5. Use refractory brick adhesive or refractory cement to bond the new high alumina refractory bricks to the original brick wall. 6. After the adhesive is dry, the furnace can be started again to let the new high alumina refractory brickwork together with other parts. The construction steps of high alumina refractory bricks are as follows: 1. Clean up the working surface and prepare the required tools and materials. 2. Cut the high alumina refractory brick according to the required shape and size. 3. Use refractory brick adhesive or refractory cement to bond high alumina refractory bricks to the required position. 4. After the adhesive or castable is dry, the furnace can be heated to make the high alumina refractory brickwork together with other components. It should be noted that the...
Rotary waste incinerator is a kind of equipment used to treat solid waste, which is usually in an environment of high temperature, corrosion, and high thermal stress. To meet these stringent conditions, commonly used refractory brick materials include: High alumina brick: High alumina brick is a refractory material whose main component is high-purity alumina. It has good heat resistance, wear resistance, and corrosion resistance, and is suitable for rotary waste incinerators in high-temperature environments. Aluminum silicate brick: Aluminum silicate brick is a refractory material mainly composed of alumina and silica. It has high fire resistance and thermal shock stability and performs well in high-temperature environments. Zirconium silicate brick: Zirconium silicate brick is a refractory material mainly composed of zirconia and silica. It has good fire resistance and corrosion resistance and can withstand high temperatures and corrosive gas. Corundum mullite brick: Corundum mullite bricks are made of corundum and mullite as the main raw materials, by adding the appropriate amount of alumina, silica ultrafine powder, and additives, and firing at high temperatures in an oxidizing atmosphere. anti-oxidation. It is not easy to react with O2, H2, CO, and other gases. Silicon carbide bricks: refractory bricks made of silicon carbide as the...
Refractory bricks usually need to be fired during the production process to ensure their mechanical properties and chemical stability. However, non-fired phosphate bricks do not use sintering and can achieve their dry basis by other means. Non-fired phosphate bricks have good chemical stability, high thermal strength, and good wear resistance. They are often used as the expansion port of the shaft kiln, the lining of the high-temperature zone kiln, and the cooling zone and transition zone of the rotary kiln. The corrosion resistance of wear-resistant bricks is better than that of phosphate bricks, and they are often used in the parts with severe abrasion above the iron bricks of the shaft kiln and the cooler and kiln mouth of the rotary kiln. Phosphate bricks use phosphoric acid solution with a concentration of 42.5% to 50% as a binder, and the aggregate is bauxite clinker calcined at a temperature above 1600°C in a rotary kiln. During the use of bricks, phosphoric acid reacts with the fine powder of fired bauxite in the bricks and refractory clay and finally forms a binder mainly composed of cristobalite-type aluminum orthophosphate. The drying principle is mainly realized by the evaporation and discharge of water. During...
Both corundum castables and corundum mullite castables are a type of refractory castables, both of which have high-temperature resistance and corrosion resistance, and are often used in the lining construction of high-temperature industrial kilns. Although they all contain corundum, there are great differences in the refractory temperature and physical and chemical indicators used. First of all, let’s first understand the “corundum” component contained in the two. Corundum is an oxide mineral whose main component is Al2O3. It has the characteristics of high hardness, high melting point, and corrosion resistance, so it is widely used in metallurgy and machinery. , chemical industry, electronics, aviation and national defense, and other industrial fields. As a refractory material, it has the characteristics of high-temperature resistance, corrosion resistance, and high strength, and is widely used in the lining of high-temperature kilns. The second is the “mullite” component in the corundum mullite castable. Mullite is a mineral formed by aluminosilicate at high temperatures. Mullite will be formed when aluminosilicate is artificially heated. Generally, mullite is Artificially synthesized, it has the characteristics of high melting point, creep resistance, low expansion coefficient, thermal shock resistance, and corrosion resistance. It is a high-quality refractory material, so it is widely...
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