Process for the recovery of substantially radium free calcium su

Details Process for the recovery of substantially radium free calcium su Process for the recovery of substantially radium free calcium su

1981-12-14

1983-06-07

Vertiz, O. R.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Rare earth metal

423 215, 423167, 423319, 423320, C01F 100, C01F 1700, C22B 5900, C01B 2516

Patent

active

043870775

ABSTRACT:
Recovery of yttrium, lanthanides and radium free calcium sulphate in a phosphoric acid process by digesting phosphate rock with an excess of phosphoric acid in the presence of more than about 5 wt.% of SO.sub.4 -ions calculated to the amount of phosphate rock, separating out the insoluble residue and recovering yttrium and lanthanides therefrom, precipitating calcium sulphate from the remaining solution with sulphuric acid and separating this calcium sulphate from the resulting phosphoric acid solution.

REFERENCES:
patent: 1944048 (1934-01-01), Walker et al.
patent: 2531977 (1950-11-01), Hammouen et al.
patent: 3647361 (1972-03-01), Coltrinari et al.
patent: 4041125 (1977-08-01), Alstad et al.
patent: 4282192 (1981-08-01), Larson

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