Recovery of lanthanides

Details Recovery of lanthanides Recovery of lanthanides

1986-04-07

1990-11-27

Doll, John

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Rare earth metal

C01F 1700

Patent

active

049734555

ABSTRACT:
Lanthanide components are recovered from a fluorine-containing material by a method which comprises mixing the material with silica and sulfuric acid, heating the mixture to induce a reaction and volatilize fluorine compounds, and dissolving lanthanides from the reacted mixture with an aqueous medium. The silica is an acid-insoluble form, such as sand or diatomaceous earth. Heating should be to temperatures at least about 150.degree. C. The method is particularly useful for recovering cerium from roasted, acid-leached bastnasite flotation concentrates.

REFERENCES:
patent: 3193351 (1965-07-01), Miller et al.
patent: 3353928 (1967-11-01), Woyski et al.
patent: 3375061 (1968-03-01), Healy et al.
patent: 4051219 (1977-09-01), Hafner
H. E. Kremers, "The Rare Earth Industry", Journal of the Electrochemical Society, vol. 96, pp. 152-157 (1949).
V. E. Shaw, "Extraction of Rare-Earth Elements from Bastnaesite Concentrate", U.S. Bureau of Mines Report of Investifations 5474 (1959).
Phosphoric Acid, vol. 1, Part II, A. V. Slack, ed., Marcel Decker, Inc., New York (1968), pp. 696-702, and 708.

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