FIELD: chemistry.
SUBSTANCE: aqueous solutions of metal chlorides are successively treated with an oxidant and a calcium chloride source and/or barium chloride source with molar ratio of oxidant and divalent iron ions in the range (0.95-1.90):1.0 and molar ratio of calcium chloride and/or barium chloride and sulphate ions in the range (0.9-1.1):1.0 with subsequent coprecipitation of a hydrate of iron (III) oxide and calcium sulphate and/or barium sulphate at pH of the reaction medium between 5.0 and 9.5 and separation of the liquid and solid phase of the suspension.
EFFECT: invention increases degree of purification of solutions, efficiency of the process and allows for carrying out the process in continuous mode.
14 cl, 1 tbl, 5 ex
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