从浓氟化物浸出液中溶剂萃取铜和锌时,发现形成的界面污物几乎完全由二氧化硅所组成。浸出液大约含SiO_2500毫克/升,这些二氧化硅可以用Whatman膜滤器除去,从而防止界面污物的形成。但是,用过滤、凝聚或吸附法除去二氧化硅,难以在工厂实际中应用。加入大约500毫克/升氟离子,对防止二氧化硅的沉淀有显著作用,可得清洁的液-液界面,因而在连续逆流试验中采用了这种做法。 Solvent extraction of copper and zinc from concentrated fluoride leachate revealed that the interface fouling formed was almost entirely composed of silica. The leachate contains approximately SiO22500 mg / L, and these silicas can be removed by Whatman membrane filters to prevent the formation of interface fouling. However, removal of silica by filtration, coagulation or adsorption is difficult to apply in the factory. The addition of about 500 mg / l fluoride ion has a significant effect on preventing the precipitation of silica and results in a clean liquid-liquid interface, thus allowing this to be done in a continuous countercurrent test.