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Method of production of alumina from clays and silicones generally aluminous catos
Method of production of alumina from clays and silicones generally aluminous catos
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机译:由粘土和有机硅生产氧化铝的方法
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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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