Processing of rare earth ores
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United States of America Patent
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Dec 11, 1990
Issued Date -
N/A
app pub date -
May 3, 1990
filing date -
Sep 10, 1985
priority date (Note) -
Expired
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Abstract
Rare earth hydroxides are recovered from the rare earth ores, e.g., monazite, xenotime and/or bastnasite, by treating the ore with an aqueous solution of an alkali metal hydroxide, under agitation and essentially constant pressure, at a temperature of from about 100.degree. to 220.degree. C., and wherein the ratio by weight of alkali metal hydroxide/ore ranges from about 1.4 to 0.5, e.g., a weight ratio of sodium hydroxide/ore of from about 1 to 0.5, or a weight ratio of potassium hydroxide/ore of from about 1.4 to 0.7.
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