Process for recovering rare earth metal from oxide ore by concen

Details Process for recovering rare earth metal from oxide ore by concen Process for recovering rare earth metal from oxide ore by concen

1996-11-13

1998-05-26

Langel, Wayne

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Rare earth metal

423140, 4231501, C01F 1700

Patent

active

057560560

ABSTRACT:
A process for recovering scandium economically with high efficiency by concentration and separation from an oxide ore containing nickel and a small amount of scandium as well as a large amount of iron and/or aluminum comprises the steps of acid leaching the oxide ore under a high-temperature, high-pressure oxidative atmosphere while restraining leaching of the iron and/or aluminum, thereby selectively leaching substantially all nickel and scandium from the ore, recovering the nickel from the resulting leaching solution as a precipitated sulfide while not precipitating the scandium as a sulfide but leaving the total amount thereof in the solution, and then adjusting the pH of the solution with a precipitant to recover the scandium from the solution as a high-concentration scandium hydroxide or carbonate by concentration and separation.

REFERENCES:
patent: 2874039 (1959-02-01), Pruvot
patent: 3049403 (1962-08-01), Krumholz
patent: 4012494 (1977-03-01), Lussiez
patent: 4503017 (1985-03-01), Gadd et al.
patent: 4861371 (1989-08-01), Lowenhaupt
patent: 4968504 (1990-11-01), Rourke
patent: 4988487 (1991-01-01), Lai et al.

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