Actually refers to aluminum hydroxide of aluminum oxide hydrate. The aluminum salt solution such as aqueous ammonia or an alkali is added to obtain a white gelatinous precipitate, the water content fixed, composition is not uniform, referred to as hydrated alumina. http://www.hnhxgk.com
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Garnet, also known as water cutter sand, is made from calcium-aluminium silicate, which is with high hardness and melting point. Through magnetic separation, they appear in red, brown, green etc. It is widely used in sandblasting and water jet cutting for its characteristics.