FIELD: inorganic compounds technologies.
SUBSTANCE: invention relates to purification of phosphoric acid containing considerable amount of magnesium ions, in particular phosphoric acid produced in chemicals plant "Belorechenski", with organic extractants. Specifically, phosphoric acid is extracted with tributyl phosphate by mixing organic and aqueous phases followed by further separation thereof to produce raffinate. Organic phase is re-extracted to produce purified phosphoric acid. Extraction is carried out in 4-5 steps while performing mixing in each step for 1.0-1.5 min.
EFFECT: enabled purification of phosphoric acid to low impurity level so that can be used to produce technical and food-grade phosphate salts.
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