【摘要】 以氧化锌烟尘浸出所得铅渣为原料,开发了"氯化浸出—锌片置换铅—置换后液中和沉锌"综合处理工艺,重点考察了药剂浓度、液固比、温度等条件对氯化浸出的影响,并开展了浸出液置换沉铅和中和沉锌探索试验。结果表明,优化的氯化浸出条件为:液固比30 mL/g、温度80℃、NaCl浓度320 g/L、CaCl₂浓度15 g/L、浸出时间2 h,铅、锌和银的浸出率分别为98.30%、81.77%和29.47%;浸出液在60℃下采用锌片置换沉铅,所得海绵铅纯度为92.09%,铅总回收率达95%以上。工艺可取得一定经济和社会效益,并为含铅锌固废的处理提供借鉴。更多还原

【Abstract】 Applying lead residue from leaching of zinc oxide dust as raw material, a comprehensive treatment process of chlorination leaching, lead replacement with zinc sheet, neutralization and zinc precipitation after replacement was developed.Effects of reagent concentration, L/S and temperature on chlorination leaching were investigated, and exploratory experiments of lead replacement precipitation from leaching solution and zinc neutralization precipitation were carried out.The results show that leaching rates of lead, zinc and silver are 98.30%,81.77% and 29.47% respectively under the optimum conditions including L/S=30 mL/g, temperature of 80 ℃,NaCl concentration of 320 g/L,CaCl₂ concentration of 15 g/L,and leaching time of 2 h.The leaching solution is replaced by zinc sheet at 60 ℃,and purity of lead in sponge is 92.09% with total recovery of lead of 95% above.This process can obtain certain economic and social benefits, and provide a feasible reference for treatment of lead-zinc containing solid waste.更多还原