从高氟氯次氧化锌中回收锌铅

采用氢氧化钠和碳酸钠混合碱液洗涤脱除次氧化锌中的氟氯。在碱液中氢氧化钠和碳酸钠摩尔比为1∶1,控制液固比、洗涤温度时,氟、氯脱除率分别为92.31%和96.57%。碱洗液经沉锌、沉氟、沉氯处理,溶液中锌、氟、氯浓度分别为0.37、0.048、0.083g/L。采用锌电解废液浸出经碱洗脱除氟氯后的次氧化锌,控制电解废液硫酸浓度、液固比、浸出温度,浸出液中锌、铅、氟、氯浓度分别为86.27g/L、0.027g/L、0.042mg/L、0.078mg/L,浸出渣中锌和铅含量分别为9.13%和50.84%,锌和铅回收率分别为95.36%和96.57%。

Recovery of Zinc and Lead from Zinc Suboxide Bearing High Fluorine and Chlorine

Fluorine and chlorine in zinc suboxide were removed by cleaning with mixed solution of NaOH and Na2CO3.Fluorine and chlorine removing efficiency is 92.31%and 96.57%,respectively under the conditions of molar ratio of NaOH and Na2CO3of 1∶1and controlled L/S and temperature.Concentration of zinc,fluorine and chlorine in alkaline cleaning solution is 0.37,0.048,and 0.083 g/L after precipitating.Zinc suboxide whose fluorine and chlorine were removed was leached with zinc electrolytic waste liquid by controlling H2SO4concentration,L/S and temperature of leaching.Zinc,lead,fluorine and chlorine concentrations in leaching solution are 86.27g/L,0.027g/L,0.042mg/L,and 0.078mg/L.Zinc and lead content in leaching residue is 9.13%and 50.84%,respectively.Recovery efficiency of zinc and lead is 95.36%and 96.57%,respectively.