Method for recovering reusable rare earth compounds

Details Method for recovering reusable rare earth compounds Method for recovering reusable rare earth compounds

1996-09-23

1998-03-17

Bos, Steven

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Rare earth metal

C01F 1700

Patent

active

057283559

ABSTRACT:
A method for recovering reusable rare earth compounds such as rare earth oxides, rare earth fluorides, or rare earth metals from rare earth alloy scrap in an effective and safe manner. The method includes the steps of: (a) pulverizing rare earth alloy scrap at least by hydrogenating the alloy scrap to obtain pulverized alloy scrap, (b) heating the pulverized alloy scrap to obtain an oxide, (c) contacting the oxide with an acid solution to leach rare earth element into the acid solution in the form of ions, and filtering a resulting solution containing rare earth ions to obtain a filtrate, and (d) forming a precipitate containing rare earth element from the filtrate.

REFERENCES:
patent: 3341437 (1967-09-01), Wood
patent: 4760966 (1988-08-01), Finnegan et al.
patent: 5110374 (1992-05-01), Takeshita et al.
patent: 5143560 (1992-09-01), Doser

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