Recovery of rare earth elements from Bayer process red mud

Details Recovery of rare earth elements from Bayer process red mud Recovery of rare earth elements from Bayer process red mud

1989-07-18

1991-07-09

Andrews, Melvyn J.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Rare earth metal

C01F 1700

Patent

active

050304240

ABSTRACT:
A process for the recovery of rare earth elements from Bayer Process red mud includes the following steps: (a) digesting red mud containing rare earth elements with a dilute acid solution, e.g. sulphur dioxide dissolved in water, to selectively dissolve the rare earth elements while leaving iron in the red mud substantially undissolved; (b) separating the solution obtained from the solid residue and (c) recovering the rare earth elements from the solution.

REFERENCES:
patent: 3159452 (1964-12-01), Lerner
patent: 3311449 (1967-03-01), Atsukawa et al.
patent: 3574537 (1971-04-01), Jui-Hsiung Tsai
patent: 4668485 (1987-05-01), Cresswell et al.
Chemical Abstract 82:158985c.
Chemical Abstract 90:9636c.
Chemical Abstract 92:79947v.
Chemical Abstract 93:118027n.

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