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process for extraction of alumina from clay and other alumosilikaten and after this procedure produced alumina.
process for extraction of alumina from clay and other alumosilikaten and after this procedure produced alumina.
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机译:从粘土和其他铝硅碱中提取氧化铝的方法,然后生产氧化铝。
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摘要
A method of obtaining alumina from clay or other alumino-silicate comprises the step of reacting the clay or other aluminium silicate with a salt of an alkali metal or ammonia, the reaction being carried out in the dry state at a temperature between 300-750 DEG C and for a time between 45 and 120 minutes to produce a double salt of aluminium-alkali or aluminium-ammonium. The double salt is then separated from the reaction product by dissolution, and thereafter the aluminium is precipitated as aluminium hydroxide, which is calcined to give crystalline alumina.
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