Patent ID: 9353425
Filing Date: 2016-05-31
CPC Classification: C01B,C01F,C01G,C21B,C22B,Y02P

Claim Text:
1. A process for preparing alumina, said process comprising: leaching an aluminum-containing material with HCl so as to obtain a leachate comprising aluminum ions, magnesium ions and a solid, and separating said solid from said leachate; substantially selectively precipitating MgCl reacting said leachate with HCl so as to obtain a liquid and a precipitate comprising said aluminum ions in the form of AlCl optionally reacting said precipitate with a base; treating said precipitate under conditions effective for converting said precipitate into Al treating said MgCl wherein MgCl 2 is substantially selectively precipitated from said leachate and removed therefrom and then, said leachate is reacted with HCl so as to obtain said liquid and said precipitate comprising said aluminum ions in the form of AlCl 3 , and separating said precipitate from said liquid.