1, acid refractory usually refers to the content of SiO2 is more than 93% of the refractory material, its main characteristic is under the high temperature resistant to acid slag erosion, but easy to react with the alkaline slag. Acidic silica refractory materials commonly used and clay brick. Silica brick containing silicon oxide is more than 93% of the siliceous products, use of raw materials such as silica and waste silica brick, its acidic slag erosion resistance is strong, high refractoriness under load, repeated after calcining volume contractive, even a slight expansion; But its vulnerable to alkaline slag erosion, reting resistance is poor. Silica brick is mainly used for coke oven, glass furnace, acidic furnaces and other thermal equipment. Clay brick refractory clay as the main raw material, alumina containing 30% ~ 46%, is a weak acid refractory, reting resistance is good, the acidic slag corrosion resistance, wide application.
2, basic refractory generally refers to magnesium oxide and magnesium oxide and calcium oxide as the main component of refractory materials. This kind of refractory materials have high refractoriness, strong resistance to basic slag. For example, magnesite brick, magnesite chrome brick, magnesite chrome brick, magnesium aluminum brick, dolomite brick, forsterite brick, etc. Mainly used in alkaline furnaces, non-ferrous metal smelting furnace, cement kiln, etc.
3, silicate aluminum refractory refers to SiO2, Al2O3 as the main component of refractory material, according to how much of the Al2O3 content can be divided into half siliceous (15-30% Al2O3), clayey (Al2O3 30 ~ 48%), high aluminum (more than 48% of Al2O3) three categories.
4, fused cast refractories is refers to in a certain way will cooperate with material after high temperature melting, pouring into certain shapes of refractory products.
5, neutral refractory is refers to the high temperature and acidic or alkaline slag are not obvious reaction of refractory materials, such as chromium and carbon refractory refractory. Some high aluminum refractory materials will fall under this category.
6, special refractory material is in the tradition of ceramic and refractory materials developed on the basis of a new type of inorganic non-metallic materials.
7, monolithic refractories is made up of refractory aggregate and powder, bond or other mineral admixtures, a proportion of mixture can be used directly or add the appropriate liquid mixing after use. Amorphous refractory material is a new type without calcination refractories, the refractoriness is not lower than 1580 ℃.
