Processes for preparing alumina and various other products

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ABSTRACT There are provided processes for preparing alumina. These processes can comprise leaching an aluminum-containing material with HCI so as to obtain a leachate comprising aluminum ions and a solid, and separating said solid from said leachate; reacting said leachate with HCI so as to obtain a liquid and a precipitate comprising said aluminum ions in the form of AICI3, and separating said precipitate from said liquid; and heating said precipitate under conditions effective for converting A1C13 into A120 3 and optionally recovering gaseous HCI 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.