Deep Defluorination from Tungsten Smelting Wastewater
Taking the fluorine-containing wastewater generated by a tungsten smelting enterprise as the research object,aiming at the problem that the defiuorination effect of the existing process can not meet the requirements of the national comprehensive sewage discharge standard,three processes of calcium chloride precipitation method,calcium chloride aluminum salt coagulation precipitation method and ion exchange refsin defluorination method were compared and studied.The results show that it is difficult to ensure the standard discharge of wastewater by using calcium chloride precipitation method alone.Both calcium chloride aluminum salt coagulation precipitation method and resin defluorination method can reduce F mass concentration in wastewater from 58.45 mg/L to below 10 mg/L and the discharge standard can be achieved.In contrast,the resin has the best fluoride removal effect and the defluorination rate of 99.64％.It can be used in combination with chemical precipitation as a combination of deep defluoriation process.
万方数据
维普
