FIELD: processing of mineral raw materials. SUBSTANCE: method for production of magnesium oxide includes decomposition of serpentinite with mineral acid and thermal treatment of magnesium salts up to its oxide. Serpentinite is decomposed with sulfuric acid with concentration within 10-50% and subsequent removal of impurities of hydroxides at pH 8-8.5, carbonization of pure solution of magnesium sulfate with thermal decomposition of magnesium carbonate to its oxide. Process of decomposition of serpentinite with sulfuric acid is intensified at temperature of 90-100 C. EFFECT: highly pure product and simplified known method. 2 cl, 1 dwg, 2 tbl
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