Research on reducing the amount of thallium containing sludge in lead smelter acid treatment
The thallium-containing wastewater produced by China's lead smelting enterprises is mainly flue gas purification wastewater,commonly known as sewage acid,accounting for about 20%to 30%of the total wastewater of smelters,and the total thallium of the sewage acid has a high content in the raw material itself,and the dilute acid used for flue gas purification has been cycled for many times,making the total thallium concentration in the sewage acid of the enterprise relatively high.Thallium itself is a highly toxic substance,the most toxic and hidden thallium salt is thallium sulfate.The production process of lead smelting enterprises will inadvertently bring thallium into the ecological environment while threatening human health,environmental pollution problems are becoming increasingly prominent,thallium-containing mineral resources utilization process,must take necessary pollution prevention measures.After adding ion exchange equipment to the wastewater treatment process of existing enterprises,that is,after the oxidation of potassium permanganate added to the sewage acid,it is concentrated and recovered by RCX-5143 resin replacement;the effluent Tl is controlled at a very low level at the same time,which effectively reduces the processing capacity of subsequent precipitated sludge;through the experimental study of the technical center,the cooperation between the ion exchange thallium removal equipment and the existing process can meet the purpose of sludge reduction in the experimental design,which can save costs for the production of enterprises and provide support for improving the process.
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