关键词: 铜铅分离, 重铬酸钾, 含铬废水处理, 废水循环利用

Abstract: A lead-zinc mine produced two concentrate products of lead and zinc, where copper content in lead concentrate was over 1.30%. The potassium dichromate was used to realize lead inhibition and copper floating to recover copper from Cu-containing lead concentrate. In this closed-circuit test, copper concentrate containing Cu of 12.34% and Pb of 8.94% with Cu and Pb recovery of 37.07% and 1.18% respectively were achieved; A Lead concentrate containing Pb of 62.85% and Cu 0.42% with Pb and Cu recovery of 89.11% and 13.61% respectively were obtained. Then, “Na₂SO₃+CaO” was adopted to treat the waste water containing chromium ions to reduce the concentration of Cr ⁶⁺ to 0.19 mg/L, and to reduce the concentration of total chromium ions to 1.28 mg/L. So the waste water can be reused and the environmental pollution was resolved. Both kinds of waste water from copper and lead separation were mixed and used in the closed-circuit process, which has little influence on the experimental index.

Key words: Separation of Cu and Pb, Potassium dichromate, Treatment for waste water containing Chromium, Recycle of waste water