Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Group iiia metal or beryllium
Patent
1974-08-12
1976-06-01
Carter, Herbert T.
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Group iiia metal or beryllium
23305A, 423132, 423483, 423489, C01F 722
Patent
active
039610306
ABSTRACT:
An aluminum-containing ore such as a kaolin or montmorillonite clay is treated with a fluorine acid such as HF or H.sub.2 SiF.sub.6 to produce aluminum fluoride (AlF.sub.3) which is recovered from the liquid phase of the reaction mixture by crystallization as AlF.sub.3 . 3H.sub.2 O crystals which are then dried and dehydrated to yield AlF.sub.3. The crystallization mother liquor is recycled to the process to recover its AlF.sub.3 values. The AlF.sub.3 . 3H.sub.2 O crystals and separated solid phase of the reaction mixture are washed to recover AlF.sub.3 values and the wash streams are recycled to the process. To produce alumina, the AlF.sub.3 is pyrohydrolyzed to Al.sub.2 O.sub.3 and HF. The HF is absorbed in the crystallization mother liquor and recycled with the mother liquor to the ore treatment step. All or a part of fluorine acid requirements can also be supplied from any suitable source such as, for example, a wet process phosphoric acid facility which is a plentiful source of inexpensive fluorine. The fluorine acid requirements can be supplied in a recycle stream of the process such as the crystallization mother liquor and/or a fresh make-up stream. The process converts the aluminum values in aluminum-containing ore deposits to a form (Al.sub.2 O.sub.3) useful in the production of aluminum metal.
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Miller David J.
Wiewiorowski Tadeusz K.
Carter Herbert T.
Freeport Minerals Company
Schapira Ronald A.
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