FIELD: mining. SUBSTANCE: solution is passed through a lump ore with iron salts deposited on its surface in the form of hydroxides, basic sulfites or jarosites. In warm season, when temperature of reusable solutions is in the range of 10-27 C, the pH of solutions is maintained on the level of 1.9-2.5. When solution temperature falls to values from -1 to 7 C, the pH of solutions is 1.0-1.5. EFFECT: enhanced efficiency. 1 tbl
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