refractory

Refractory bricks, also called shaped refractory materials, have high strength and wide applications and are easy to construct. They have been widely used in a variety of industrial furnaces.

(1) Common fire clay bricks are generally used in the refractory masonry of furnaces and kilns. in the linings, walls, bottoms and flues, they are used below 1250℃. When used in the combustion chamber, they can be used above 1400℃.

(2) High alumina bricks are generally used in the parts of furnaces exposed to high temperature, severe erosion and high load, burner bricks and some parts that have special requirements. They are allowed to be used at 1300-1650℃.

(3) Lightweight fireclay bricks can be used in the lining of furnaces to resist high temperature molten slags and corrosive gases. They can be used at 1150-1400℃.

(4) Lightweight alumina bricks can be used the low-temperature linings below 1350℃ and the parts that are not exposed to high temperature molten substances and erosion. They can be in direct contact with the flame.

(5) Common corundum brick can be used in the hot face of linings in heavy oil gasifiers, important parts of saline wastewater incinerators and radiant burners. It is generally used below 1600-1670℃.

(6) Silicon carbide bricks have high thermal conductivity, good thermal stability and high strength. They can resist the reductive atmosphere. They can be used in the lings that are required to have good wear resistance, good thermal stability, good thermal conductivity and reductive atmosphere resistance. they can be used below 1400-1600℃.

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The raw material consumption of refractory materials refers to the amount of raw materials consumed when producing a ton of refractory materials.

The raw material consumption (Kg/ton) is equal to the ratio of the amount of raw materials consumed (kg) and the amount of qualified refractory materials (ton).

The amount of raw materials consumed is respectively calculated according to fired refractory products (according to the material), non-burnt refractory products (according to the material), special refractory (according to the material) and monolithic refractories (according to the material).

The raw materials consumed include raw material, clinker and waste bricks, but do not include mineralizing agent and binding agents (such as lime, pulp waste, iron phosphate, sodium silicate, aluminum sulfate, etc.).

Mullite is a general name of a series of minerals composed of aluminum silicate. It is rare. Mullite is the mineral generated by aluminum silicate at high temperature. Natural mullite crystals are needle-like and tufted. It can be used to produce refractory materials.

Mullite is the only binary compound under atmospheric pressure among Al2O3 -SiO2 binary system, expressed as 3Al2O3-2SiO2. Natural mullite is rare, so it is generally synthesized by the sintering method or fusing method. Its Mohs hardness is 6-7. Its refractoriness is 1800℃. At 1800℃, it is stable, while it is decomposed into corundum and liquid at 1810℃.

Mullite brick is a high quality refractory material. It has a uniform expansion, excellent thermal shock resistance, high softening point under load, small high temperature creep, high hardness and good chemical corrosion resistance. Currently, mullite bricks mainly include high purity fused mullite brick, common fused mullite brick, sintered mullite brick made of natural bauxite ore and light burned mullite brick.

High temperature mullite insulation brick is a new energy-saving refractory material. It has high temperature resistance, high strength, small thermal conductivity and good energy-saving effects. It is widely used in petroleum cracking furnaces, metallurgy hot stoves, ceramics roller kilns, tunnel kilns, porcelain drawer kilns, crucible furnaces and the lining of a variety of electric furnaces. It can contact with flame directly.

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