From the perspective of refractory brick materials, the common types of refractory bricks are: clay bricks, high alumina bricks, mullite bricks, corundum bricks, magnesia bricks, magnesia carbon bricks, carbonaceous refractory bricks, etc.
1. Clay brick is the most cost-effective and widely used refractory brick among refractory bricks. However, clay refractory bricks can also adjust the formula of clay refractory bricks according to the specific use environment, and can produce clay bricks with different performances. The types of clay refractory bricks are as follows:
(1) Low creep clay brick, the performance of this clay refractory brick is that the creep rate is low, and the volume is more stable in high temperature environment.
(2) Phosphoric acid impregnated clay bricks, after the clay bricks are impregnated with phosphoric acid solution, they have strong resistance to alkaline slag erosion and high compressive strength.
(3) Low-porosity clay bricks, also known as dense clay bricks, pay more attention to porosity during production, increase the density of clay bricks, make them denser and have better compressive strength.
(4) Lightweight clay bricks are generally used as refractory bricks for thermal insulation of industrial kilns. They are light in size, low in density, many pores and good in thermal insulation.
2. High-alumina bricks are higher than clay bricks in terms of performance and use effect, but high-alumina refractory bricks are also higher in price than clay refractory bricks. High-alumina bricks have good aluminum content and a wider range of use, but high-alumina bricks There are also many types, we will introduce them below:
(1) Low-creep high-alumina brick is a refractory brick with low creep rate, strong heat storage capacity, and more stable volume at high temperature. It and low-creep clay brick have low creep properties.
(2) Anti-stripping high-alumina bricks have strong anti-stripping performance, good alkali erosion resistance and stable thermal shock performance, and are generally used in cement rotary kilns.
(3) Phosphate high alumina bricks are very different from phosphoric acid impregnated clay bricks. Phosphate high alumina bricks are high alumina refractory bricks made of phosphate solution as a binder. Grinding is better.
(4) Micro-expanded high-alumina bricks, high-alumina bricks are made by adding a small amount of andalusite and sillimanite powder to slightly expand the volume of high-alumina bricks. In the high-temperature furnace environment, the integrity is better and the slag resistance is enhanced. .
(5) Three-two-one, super high-alumina bricks, this type of high-alumina bricks determine the grade of high-alumina bricks based on the level of aluminum content. 65%, the aluminum content of first-grade high-alumina bricks is 75%, and the aluminum content of super high-alumina bricks is more than 80%. The higher the aluminum content of high-alumina bricks, the more expensive the price of high-alumina bricks will be.
(6) Lightweight high-alumina bricks, together with lightweight clay refractory bricks, are used as heat-insulating refractory bricks for kilns, with good thermal insulation effect and stable thermal shock performance. When purchasing lightweight refractory bricks, if the lightweight clay bricks can meet the conditions of use, there is no need to purchase lightweight high-alumina bricks. The specific purchase of lightweight refractory bricks also needs to consider the actual needs.
3. Mullite brick, which is a kind of high-alumina refractory brick, but because its raw material is mainly mullite raw material, it is a refractory brick made by processing, and the main chemical of mullite brick is that the aluminum content is 55%. %about. Mullite bricks can also be made into mullite refractory bricks with different properties according to specific needs, such as:
(1) Lightweight mullite bricks have good thermal shock resistance, low creep rate, small thermal expansion coefficient and good gas erosion resistance.
(2) Tough mullite brick has good wear resistance, high compressive strength, high softening temperature under load, and good thermal stress. It is used for lining of hot air ducts, which can prolong the service life of hot air ducts and reduce the occurrence of hot air duct accidents.
(3) Sintered mullite brick is a sintered refractory brick made of sintered mullite as the main raw material, adding powder and binder and sintering at high temperature.
(4) The fused mullite brick is an fused refractory brick made of fused mullite as the main raw material, adding powder and binder and melting in an electric arc furnace.
(5) Sillimanite brick is a kind of mullite refractory brick. It is made of sillimanite and bauxite as refractory raw materials. Under high temperature sintering, sillimanite presents a mullite phase, and its resistance to It has good grinding properties and strong slag erosion resistance, and can be used in industrial kilns such as coke ovens and blast furnaces.
4. Corundum bricks, corundum refractory bricks are high-grade refractory bricks with high alumina refractory bricks, and their aluminum content is more than 90%. Different corundum refractory bricks can be processed according to different corundum raw materials, such as white corundum refractory bricks, brown corundum refractory bricks, etc. Corundum refractory bricks, zirconium corundum refractory bricks, corundum mullite bricks, sintered corundum bricks and fused corundum bricks, etc.
(1) White corundum bricks are made of white corundum as the main raw material and are sintered at high temperature. Brown corundum refractory bricks and zirconium corundum refractory bricks will not be explained here.
(2) Corundum mullite bricks, add appropriate corundum when making mullite bricks, and make fused corundum mullite bricks and sintered corundum mullite bricks by electrofusion or sintering.
5. Magnesia brick is a magnesia refractory brick made of fused magnesia or sintered magnesia as the main raw material, adding powder and binder, and processed by electrofusion or sintering. The magnesia brick has a high softening temperature under load and is resistant to Alkaline slag has strong ability and can be used in higher temperature working environment. Magnesia bricks can be added with other refractory raw materials as required to make refractory bricks with different properties, such as magnesia-carbon bricks, magnesia-calcium bricks, magnesia-alumina bricks and other magnesia refractory bricks.
(1) Magnesia-carbon bricks are magnesia-carbon refractory bricks made of sintered magnesia and graphite as the main refractory raw materials, adding phenolic resin binder, and pressing and molding at low temperature. They are mainly used for ladle, submerged arc furnace, electric furnace, etc. Industrial thermal equipment.
6. Carbon brick is made of graphite, anthracite, coke, etc. as refractory raw materials, adding powder binder and sintering in a reducing atmosphere isolated from air. The types of carbon bricks are: self-baking carbon bricks, ordinary carbon bricks, semi-graphite carbon bricks, microporous carbon bricks and high temperature molded carbon bricks.
The above is a brief introduction of common types of refractory bricks in terms of materials. Refractory bricks must first determine their use environment. Different use environments may have differences in the performance and indicators of refractory bricks.
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