FIELD: metallurgy.
SUBSTANCE: in compliance with proposed method, solution of metal complex salt is obtained by interaction between of the mix crystallohydrated metal salt solution and complexing agent taken in stoichiometric relationship. Powder is settled from produced solution by introducing reducing agent therein. The latter represents powder of zinc or aluminium in amount of 100-200 kg/t of crystallohydrated salt to produce suspension. Note here that solution is heated to 70-80°C and conditioned on mixing for 2-3 hours. Suspension is filtered, rinsed and dried.
EFFECT: reduced power consumption, simple equipment and high purity.
3 ex, 1 dwg
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