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CONTINUOUS METHOD FOR YIELDING PURE ALUMINA FROM THE FLUID GAINED AFTER THE RECOVERING OF ALUMINIUM ORE BY CULFURIC-HYDROCHLORIC ACID AND METHOD FOR CLEANING THE REMAINED FLUID
CONTINUOUS METHOD FOR YIELDING PURE ALUMINA FROM THE FLUID GAINED AFTER THE RECOVERING OF ALUMINIUM ORE BY CULFURIC-HYDROCHLORIC ACID AND METHOD FOR CLEANING THE REMAINED FLUID
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机译:用盐酸溶液回收铝矿石后从收集的液体中产生纯铝的连续方法和清洁残留液体的方法。
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摘要
A process for obtaining pure alumina comprising the combination of chlorosulphuric attack of calcined aluminous ores containing impurities, followed by concentration of the liquor obtained after the attack and separation of the sterile material, sulphuric acid treatment of the concentrated liquor followed by chlorination to precipitate almost all the hexahydrated aluminum chloride, separation of the precipitate of hexahydrated aluminum chloride and of the chlorosulphuric mother liquor charged with impurities, pyrohydrolysis of the precipitate to give the desired pure alumina with recycling of released hydrochloric acid, degassing of the chlorosulphuric liquor of impurities with recycling of the gaseous HCl for chlorination, yielding a sulphuric liquor of impurities, finally the elimination of the impurities present in this latter liquor in the form of a sulphuric precipitation by concentration in the presence of potassium ions.
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