我国光伏光电行业体量大,含氟废水经处理将产生大量的含氟污泥,其中氟化钙占40%以上,提纯后可替代天然的萤石矿,具有很高的市场挖掘潜力.经属性分析,含氟污泥具有腐蚀性、毒性及其他危险特性,且存在处置困难、利用率低的现状.因此拟采用废水回用、分质提纯的思路对水洗酸洗法进行优化,达到以废治废的目的,还可降低HF等的高成本投入;做到F-的富集,对新产生的含氯废水、含氟废水考虑以不外排的方式循环回用.提纯过程中通过控制HCl的投加量、pH、反应时间、温度、搅拌速率,综合考虑工业生产的可操作性和经济效益,使含氟污泥纯度达到制HF级的90%以上.%The photovoltaic industry in China is large, the treatment of fluorine-containing wastewater will generate a lot of by-products, fluorine-containing sludge, of which calcium fluoride accounts for more than 40%. It is noted that fluorine-containing sludge can replace natural fluorite ore after purification, and this will bring high market value. Accordingto the analysis of physical and chemical properties, fluoride-containing sludge not only has corrosive, toxic and other hazardous characteristics, but also has the difficulty of disposal and low utilization. Therefore, it was proposed to optimize washing pickling method by wastewater reuse and purification, so as to achieve the wastewater treatment and reduce the high cost of hydrofluoric acid inputs, while enriching F-and utilizing the newly generated Cl-containing wastewater and F-containing wastewater. By controlling the dosage of HCl, pH, reaction time, temperature and stirring rate, and comprehensively considering the operability and economic benefits of industrial production, the purity of calcium fluoride sludge can reach more than 90%.
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