FLUORIDFORBINDELSE OG FREMSTILLING OG ANVENDELSE AV DENNE.

摘要

A particulate mixture of Fe2O3 and RE2O3, where RE is a rare earth element, is reacted with an excess of HF acid to form an insoluble fluoride compound (salt) comprising REF3 and FeF3 present in solid solution in the REF3 crystal lattice. The REF3/FeF3 compound is dried to render it usable as a reactant in the thermite reduction process as well as other processes which require an REF3/FeF3 mixture. The dried REF3/FeF3 compound comprises about 5 weight % to about 40 weight % of FeF3 and the balance REF3 to this end.