A Compact and Efficient Technology to Treat Tailings Water Characterized by High Alkalinity and Ca(II) and Pb(II) Concentration

摘要

The tailings water of Luoba lead-zinc concentrator in Gansu China is characterized by high pH value and calcium oxide content, moreover, the concentration of lead ions, biochemical and chemical oxygen demand (BOD and COD) exceed the regulatory discharge standard. Studies on the combined use of ammonium bicarbonate (NH_4HCO_3) and LSQ (an innovative regent developed by Kunming University of Science and Technology) were conducted to treat the wastewater. Results show that the quality of treated tailings water by calcium removal-neutralization process can meet the regulatory discharge standard. Results show that the treated water can be reused for flotation, which helps to upgrade the quality of the concentrate and makes no difference with the fresh water used in the concentrator.