【摘要】 通过化学转化将废铅酸电池铅膏中的铅转化为草酸铅来回收铅。先用(NH4)2CO3对废铅酸电池铅膏进行脱硫处理,然后用硝酸和H2O2对脱硫后的铅膏进行浸出处理,最后向得到的溶液中加入一定量的Na2C2O4制得草酸铅,并将其在550℃下煅烧得到超细氧化铅粉体。同时对制得的草酸铅和氧化铅进行XRD和SEM分析。结果表明:脱硫过程中铅膏脱硫率可以达到99%,浸出过程中铅膏浸出率可达到95%以上,合成草酸铅过程中铅回收率为95.3%;采用将废铅酸电池铅膏转化为草酸铅来回收铅的新方法不仅环保,而且铅回收率也较高。更多还原

【Abstract】 Lead paste generated from spent lead acid battery is converted to lead oxalate via chemical conversion,mainly for recycling lead. The recycling process is conducted as follows:( ⅰ) converting the spent lead paste to lead carbonate using( NH4)2CO3as the desulfurization conversion agents,( ⅱ) leaching this desulfurized paste with an aqueous solution of nitric acid and H2O2,( ⅲ) converting the Pb( Ⅱ) in the leaching solution into the lead oxalate precipitate by adding Na2C2O4. The ultrafine lead oxide can be finally achieved by thermal decomposition at 550℃. XRD and SEM are used to characterize the lead oxalate and lead oxide. The results show that the conversion rate of lead sulfate is up to 99. 5%. The leaching rate of desulfurized paste is above 95% and the lead recovery ratio is 95. 3%. The lead oxalate prepared from spent lead paste and the lead oxalate prepared from pure materials are strip structures with size of2- 5 m and the surface of the former is smoother. The lead oxide is tetragonal phase β-Pb O,which is columnar structure with size of 100- 300 nm. This study offers a new method to prepare lead oxalate or lead oxide from spent lead battery.更多还原