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At present, there are still many selection plants that do not pay enough attention to the recycling and purification of concentrate thickener overflow and tailings clarified water. The possible schemes for studying the use of backwater have not yet been investigated, and no special purification measures have been taken for the sewage discharged from the plant. Even the tailings dam is poorly managed, causing pollution to surrounding water sources and farmland.
In order to protect the environment, make full use of water sources, save energy, and choose the sewage purification and return water use of the plant, it must receive due attention and carry out necessary experimental research so that the use of return water and sewage purification can be widely used in lead and zinc plants. .
Some domestic lead-zinc processing plant in recent years made some progress in terms of return water use and sewage purification. SKS beneficiation plant in 1982 and designed the experiments beneficiation process waste water treatment process. The overflow of the washed ore fines in the crushing process, the overflow of lead, zinc and sulfur concentrate thickeners, etc., firstly adjust the pH of the concentrated sewage to 8 to 8.5 by using downhole water, and add ZnSO 4 (or FeSO 4 ), then purify in a thickener for 1-3 hours, and the purified water obtained is returned to the plant for use. Tests have shown that after returning water, the lead and zinc concentrate grade and recovery rate are slightly improved, the foaming agent consumption is reduced by 50%, the collector is reduced by 25%, and the water consumption is reduced by two-thirds. Qingshuitang processing plant started in July 1981 using lime is selected from sewage purification plants, sewage processing plant discharge, whether the content of suspended solids or heavy metal ions in the process meet the effluent standards. Chaihe selected 1979 to treat the tailings dam overflow water by alkaline cyanidation to eliminate the S= ion process, but it was not put into industrial use.