FIELD: production of dyes. SUBSTANCE: waste solution of etching ferrum which contains copperas and sulfuric acid are neutralized by lime to pH 6.0-7.0. This process is carried out by blowing air. Thus prepared precipitate is filtered and washed by water within 3-3.5 h. Then calcination within 1 h at 750-800 C takes place. EFFECT: improves efficiency of method, simplifies the process. 1 tbl
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