Recovery of aluminum from alunite ore using acid leach to purify

Details Recovery of aluminum from alunite ore using acid leach to purify Recovery of aluminum from alunite ore using acid leach to purify

1976-03-24

1977-06-21

Carter, Herbert T.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group iiia metal or beryllium

423132, 423120, 423131, 423122, 423128, 423123, C01F 706, C01F 714

Patent

active

040311821

ABSTRACT:
A process for recovering aluminum from alunite ore directed to providing a residue for the Bayer leach step substantially free of impurities so that a high A/C ratio Bayer leach liquor is produced, which comprises roasting the ore in particulate form to drive off water and sulfur as SO.sub.2 and to convert aluminum sulfate to alumina, leaching the residue containing aluminum values with water and filtering to remove potassium sulfate and other soluble sulfates, hot leaching the residue with sulfuric acid to convert the alumina therein to soluble aluminum sulfate followed by filtering to remove silicon dioxide and other solid impurities, crystallizing the aluminum sulfate to further remove impurities, heating the residue to convert the aluminum sulfate to alumina and drive off any remaining sulfur as SO.sub.2, and digesting the alumina calcine with sodium hydroxide under standard Bayer conditions at a high A/C ratio to provide a high A/C ratio solution from which a "sandy" aluminum hydroxide is precipitated.

REFERENCES:
patent: 1256605 (1918-02-01), Spence et al.
patent: 1948887 (1934-02-01), Sanders
patent: 1951443 (1934-03-01), Sanders
patent: 2120840 (1938-06-01), McCullough
patent: 2398425 (1946-04-01), Haff
patent: 3436176 (1969-04-01), Spedden et al.

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