| 简介 |
(57) Abstract : There are provided processes for preparing alumina. These processes can comprise leaching an aluminum-containing material with HC1 so as to obtain a leachate comprising aluminum ions and a solid, and separating said solid from said leachate; reacting said leachate with HC1 so as to obtain a liquid and a precipitate comprising said aluminum ions in the form of A1C1 3 , and separating said precipitate from said liquid; and heating said precipitate under conditions effective for converting A1C1 3 into A1 2 0 3 and optionally recovering gaseous HC1 so-produced. These processes can also be used for preparing various other products such as hematite, MgO, silica and oxides of various metals, sulphates and chlorides of various metals, as well as rare earth elements, rare metals and aluminum. III Ill before the expiration of the time limit for amending claims and to be republished in the event of receipt amendments (Rule 48.2(h)) |
客服热线：
手机版
二维码
