FIELD: selective cleaning of materials. SUBSTANCE: method involves preparing an aqueous suspension of kaoline or quartz sand, introducing 0.1 5 wt. -% (from weight of suspension) of organic acid from a group including oxalic or ascorbic or citric or tannic acid, then acidifying the suspension with sulfuric acid to a pH of 2-3, heating it to 65-85 C and mixing for 1-3 h. EFFECT: higher efficiency.
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