FIELD: non-ferrous metallurgy; chemical industry; purification of mineral salts, in particular, magnesium sulfate from manganese and iron impurities. SUBSTANCE: industrial process liquor coming from copper production is treated with magnesia under permanent stirring to adjust pH value of medium at 8.1-10.5 at temperature 90-95 C, followed by blowing air/oxygen mixture through solution, air and oxygen being present in said mixture in volume ratio 10 : 0.5-1, respectively. EFFECT: higher efficiency. 2 cl, 1 tbl
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