Method for the purification of rare earth oxysulfide

Details Method for the purification of rare earth oxysulfide Method for the purification of rare earth oxysulfide

1991-10-07

1992-12-08

Morris, Theodore

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Rare earth metal

42324302, 423511, 4235762, 423210, C01F 1700

Patent

active

051696100

ABSTRACT:
An efficient method is proposed for decolorizing a rare earth oxysulfide, which is usually slightly colored in grey as prepared by the sulfiding reaction of a rare earth oxide with hydrogen sulfide, by removing sulfur impurity. The method comprises two steps of heat treatmentof which the first step is conducted in air at 450.degree. to 550.degree. C. for 2 to 5 hours and the second step is conducted in an inert gas, e.g., argon, at 800.degree. to 950.degree. C. for 2 to 5 hours.

REFERENCES:
patent: 3850837 (1974-11-01), Nath
Chemical Absracts, 249290r, 1980 Leskela, Markku et al.

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