Recovery of rare earth values from gypsum

Details Recovery of rare earth values from gypsum Recovery of rare earth values from gypsum

1990-09-17

1991-07-23

Morris, Theodore

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Rare earth metal

423555, C01F 1700

Patent

active

050342010

ABSTRACT:
Rare earth values are recovered from gypsum starting material by (i) dissolving such gypsum in water and separating therefrom the water-insoluble fractions which contain the rare earth elements (ii) treating such insoluble fractions with a solution of carbonate ions, (iii) next digesting the insoluble fractions thus treated with a mineral acid and converting at least the rear earth values into water-soluble salts thereof, and (iv) recovering such rear earth values from the medium of digestion.

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