FIELD: chemical technology. SUBSTANCE: method involves converting a porous inorganic matrix in the filter into an ammonia form by passing ammonia solution therethrough and returning filtrate into initial ammonia solution, and successive treatment in the filter of this matrix with a salt solution of transition metals and with acidified solution of potassium ferrocyanide. The method can be carried out in two stages, using additionally a second filter with a charge of porous inorganic matrix. EFFECT: higher efficiency. 2 cl
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