FIELD: chemical technology. SUBSTANCE: invention relates to methods of kieserite treatment concentrated by electrostatic way for some steps in the presence of conditioning agent. Kieserite is subjected for additional stage of electrostatic separation in air atmosphere at absolute humidity below 4.5 g/$$$, at temperature below 40 C and in the presence of 2,4-dihydroxybenzoic acid as conditioning agent taken at amount 20-50 g/t. At air humidity 2-2.5 g/$$$ and at 25-30 C process is carried out without conditioning agent. EFFECT: improved method of refining. 3 cl, 1 tbl
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