FIELD: purification of chromium-containing pickling solutions from heavy metal ions up to maximum allowable concentration. SUBSTANCE: solutions are treated with sodium sulfide in several stages at pH 6.4-9 with decrease to pH 2-4 after each stage. Formed sediments are separated by means of precoat filter. Number of purification stages depends on concentration of metal ions in initial solution. Method provides for purification of solutions from Fe, Cu, Mn, Ni and Cr. EFFECT: higher efficiency. 3 tbl
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