FIELD: processing apatite. SUBSTANCE: apatite is treated by nitric acid, precipitate being isolated. Thus obtained nitric-phosphoric acid solution is neutralized to pH 0.8-1.2 with the help of ammonia. Precipitate which contains rare-earth elements is isolated of solution. Said solution is neutralized to pH 2.0. Thus obtained precipitate is added into nitric-phosphoric acid solution. EFFECT: improves efficiency of method. 1 tbl
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Authors
Dates
1995-12-10—Published
1991-09-16—Filed