预脱硫-火法冶炼回收废铅膏中的铅  

Recovery of lead from spent lead paste by pre-desulfurizationpyrometallurgy process

作　　者：黄朝冉 黄魁 黄荃莅 刘晓芬 董海丽 HUANG Chao-ran;HUANG Kui;HUANG Quan-li;LIU Xiao-fen;DONG Hai-li(School of Resource,Environment and Materials,Guangxi University,Nanning Guangxi 530004,China)

机构地区：[1]广西大学资源环境与材料学院,广西南宁530004

出　　处：《电源技术》2020年第12期1748-1751,共4页Chinese Journal of Power Sources

基　　金：国家自然科学基金资助项目(21767003);广西自然科学基金资助项目(2018GXNSFAA281261)。

摘　　要：以废铅膏为原料,采用预脱硫-火法冶炼工艺回收铅,其中以高温管式炉模拟火法冶炼过程。详细考察了不同因素对铅膏脱硫率和滤液铅浓度的影响,并确定了高温管式炉冶炼得到铅锭的最佳温度。研究发现,综合考虑脱硫率和滤液铅浓度,最佳脱硫剂为碳酸铵,脱硫的最佳条件为:碳硫比(摩尔比)1.5∶1,(质量比)液固比5∶1,搅拌速率600 r/min,反应时间60 min。脱硫后的铅膏经热重-差示扫描量热法(TG-DSC)分析热分解特性表明,废铅膏中的PbSO4经反应转化成PbCO3后,分解温度可由833.3℃降至330.3℃。氩气气氛下,以高温管式炉模拟火法冶炼,铅膏可在较低的750℃冶炼得到总铅含量高达99.99%的铅锭,同时达到减少能耗和减少SO2气体污染的目的。The spent lead paste was used as a raw material,and lead was recovered by a pre-desulfurization-pyrometallurgy process.A high-temperature tube furnace was used to simulate the pyrometallurgy process.The effects of different factors on the desulfurization rate of lead paste and the lead content of the filtrate were examined in detail,and the optimal temperature for recovering lead bullion by high-temperature tube furnace smelting was determined.The experimental results demonstrate that the optimal desulfurizer is ammonium carbonate,the optimal conditions for desulfurization are:nC:nS=1.5:1,wL:wS=5:1,stirring speed of 600 r/min,and reaction time of 60 min,respectively,comprehensively considering the desulfurization rate and the lead content of the filtrate.The thermal decomposition characteristics of the lead paste after desulfurization process were analyzed by TG-DSC.It was shown that after the PbSO4 from spent lead paste was converted to PbCO3,the decomposition temperature of the lead paste was reduced from 833.3℃to 330.3℃.A high-temperature tube furnace was used to simulate pyrometallurgy process in an argon atmosphere.The spent lead paste can be smelted under a lower temperature of 750℃,and the total lead content of recovered lead bullion is 99.99%.Meanwhile it can reduce energy consumption and SO2 gas pollution.

关 键 词：废铅膏 脱硫 滤液铅浓度 火法冶炼 

分 类 号：TM912[电气工程—电力电子与电力传动]