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Why can refractory brick fire?


Release time:

Jan 10,2022

Refractory brick is an inorganic non-metallic material with a refractoriness of not less than 1580 ℃. It is the basic material for high-temperature technology, the structural material for thermal equipment such as masonry kilns, and the functional material for manufacturing some high-temperature containers and components or for special functions.

Why can refractory brick fire?

Refractory brick is an inorganic non-metallic material with a refractoriness of not less than 1580 ℃. It is the basic material for high-temperature technology, the structural material for thermal equipment such as masonry kilns, and the functional material for manufacturing some high-temperature containers and components or for special functions.

The successful use of refractory bricks under high temperature must have good organizational structure, thermal properties, mechanical properties and performance, that is, high refractoriness, load softening temperature, thermal shock resistance and chemical erosion resistance, in order to withstand various physical and chemical changes, to meet the requirements of thermal equipment and components.

The raw materials used in the production of refractory bricks are generally natural ores, such as bauxite, silica, magnesite and other raw materials after processing and manufacturing of different properties of refractory bricks, such as aluminum and silicon refractory bricks, silica refractory bricks and magnesia three types of refractory bricks.

Elect to use bauxite as raw material production of aluminum-silicon refractory brick is its main component is alumina, hydrated alumina containing impurities, is a kind of earthy mineral, insoluble in water, soluble in sulfuric acid, sodium hydroxide solution.

Mainly used for aluminum smelting, and the production of refractory materials, because the high bauxite clinker refractoriness up to 1780 ℃, strong chemical stability, good physical properties. The bauxite is purified at high temperature to produce a main crystal phase of corundum with alumina content greater than 90%, which can produce ultra-high temperature refractory brick fused with zirconium corundum brick.

The raw material for making siliceous refractory bricks is silica, the main component of which is SiO2, the higher the content, the higher the refractoriness. The most harmful impurities are AL2O3, K2O, Na2o, etc. The production of silicon brick is based on natural silica as raw material, plus appropriate amount of mineralizer, to promote the transformation of quartz in the body into tridymite. Slow firing at 1350 to 1430°C in a reducing atmosphere. High temperature strength. The load softening temperature is 1620 degrees C.