FIELD: process engineering.
SUBSTANCE: invention relates to production of pure rare-earth metals or their oxides from low-grade or technogenic stock by ion flotation. Said ion flotation comprises using sodium dodecyl sulphate as a collector in concentration corresponding to stoichiometric reaction: Me+3+3DS-=Me[DS-]3, where Me+3 is metal cation, DS- is dodecyl sulphate-ion. Erbium salts are used as extracted ions. Note here that maximum yield of erbium is reached at pH=6.4.
EFFECT: increased extraction of erbium ions.
1 dwg, 1 tbl
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