FIELD: nonferrous metallurgy. SUBSTANCE: calcium precipitation is carried out by saturation of zinc sulfate solution with sulfur dioxide up to pH 1.05-1.10 following by adjusting of pH up to 5.0-5.5 with zinc oxide or carbonate. Pulp is kept at stirring for 30-60 min, and calcium sulfite precipitate is separated. Foreign ions were not added to zinc sulfate solutions. Proposed method can be used for purification of neutral zinc electrolytes and zinc vitriol solutions. EFFECT: improved method of purification.
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