Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Group iiia metal or beryllium
Patent
1975-06-02
1976-12-07
Carter, Herbert T.
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Group iiia metal or beryllium
423112, 423120, 423118, 423131, 423629, 423199, 423181, 423183, C01F 706, C01D 500
Patent
active
039963349
ABSTRACT:
An improvement in processes for recovering aluminum from alunite ore which processes include roasting the ore to remove water of hydration, removing sulfur and potassium compounds from the roasted ore by a procedure including a final leaching step resulting in a residue and a solution containing potassium sulfate, effecting partial recovery of potassium sulfate from the solution by crystallization with some potassium sulfate being bled off from the mother liquor, converting aluminum values in the residue to alkali metal aluminates by digesting the residue with alkali metal hydroxide including a substantial amount of sodium hydroxide, removing silicon from the alkali metal aluminates leaving a waste desilication product, recovering aluminum values from the desilicated aluminates by precipitation, circulating the mother liquor from the precipitation step to digestion as contaminated sodium hydroxide is bled off, the improvement which comprises enhancing the economics of the overall process by introducing therein an ion exchange procedure in which potassium hydroxide for the first leaching step is produced through ion exchange by use of potassium sulfate and sodium hydroxide, a further improvement being the use of the desilication product as the ion exchange agent.
REFERENCES:
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patent: 3890426 (1975-06-01), Stevens et al.
Nachrod et al., Ed., "Ion Exchange Technology" Academic Press, Inc., N. Y., 1956, pp. 12-14.
Ewing Vernon R.
Hartman George J.
Carter Herbert T.
Earth Sciences Inc.
Hanegan Herbert M.
National Steel Corporation
Ross Kermith F.
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