Bauxite (aluminous soil; bauxite), also known as bauxite or bauxite, is divided into raw bauxite, cooked bauxite, and can also be divided into converter bauxite, shaft kiln bauxite, and down flame kiln bauxite. According to the particles can be divided into two kinds of aggregate and powder. The main component is alumina, which is a hydrated alumina containing impurities and is a soil-like mineral. White or off-white, brownish yellow or light red due to iron. The density is 3.9 to 4 g / cm3, the hardness is 1 to 3, opaque and brittle. Extremely difficult to melt. Insoluble in water, soluble in sulfuric acid and sodium hydroxide solution.
。 Mainly used for smelting aluminum and high-grade refractory materials .
转炉矾土，竖窑矾土或倒焰窑矾土中经高温加热冶炼而成。 Bauxite is smelted from raw bauxite in converter bauxite, shaft kiln bauxite or inverted flame kiln bake.
|grade||chemical composition||Refractory||Bulk Density|
|Super||> 85||<0.6||<1.4||> 1790||> 3.6|
|First level||> 80||<0.6||<3.0||> 1790||> 3.0|
|Secondary A||70-80||<0.8||<3.0||> 1790||> 2.8|
|Class B||60-70||<0.8||<3.0||> 1770||> 2.65|
|Third grade||50-60||<0.8||<2.5||> 1770||> 2.55|