Rare earth/iron fluoride and methods for making and using same

Details Rare earth/iron fluoride and methods for making and using same Rare earth/iron fluoride and methods for making and using same

1990-07-17

1991-12-17

Rosenberg, Peter D.

Alloys or metallic compositions

Ferrous

Rare earth metal containing

420416, 423250, 423471, C22C 3300

Patent

active

050733370

ABSTRACT:
A particulate mixture of Fe.sub.2 O.sub.3 and RE.sub.2 O.sub.3, where RE is a rare earth element, is reacted with an excess of HF acid to form an insoluble fluoride compound (salt) comprising REF.sub.3 and FeF.sub.3 present in solid solution in the REF.sub.3 crystal lattice. The REF.sub.3 /FeF.sub.3 compound is dried to render it usable as a reactant in the thermite reduction process as well as other processes which require an REF.sub.3 /FeF.sub.3 mixture. The dried REF.sub.3 /FeF.sub.3 compound comprises about 5 weight % to about 40 weight % of FeF.sub.3 and the balance REF.sub.3 to this end.

REFERENCES:
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Chemical Abstracts 101:212317g, Khim. Tekhnol, 1984.
The Handbook on the Physics and Chemistry of Rare Earths, 1978.
Chemical Abstract 108:82900d-"Phase Diagram of Iron Di-Fluoride-Lanthanide Tri-Fluoride Systems", 1987.

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