废铅膏湿法浸出强化结晶的影响规律研究

Effects of water bath conditioning on the recrystallization properties of spent lead pastes after leaching procedure

针对乙酸-柠檬酸钠工艺浸出制备的柠檬酸铅前驱体颗粒较小和形貌不均一的问题,以废铅酸电池主要成分废铅膏为原料,浸出制备的浆料通过水浴条件进行结晶强化处理,并采用分析纯试剂模拟废铅膏的主要化学成分进行对比研究.模拟铅膏与废铅膏浸出后在水浴结晶强化处理下得到的柠檬酸铅结晶产物形貌和过滤性能规律基本相同.相比于模拟铅膏,废铅膏水浴结晶强化处理后制备的重结晶产物形貌也更为均一,粒径介于100-200μm,过滤性能得到提高,表明水浴结晶强化过程更有利于废铅膏湿法浸出结晶.

Given the fact that the morphology of lead citrate precursors obtained in sodium citrate and acetic acid system was of small size and heterogeneous,water bath conditioning was applied in the treatment of slurry of spent lead paste after leaching with sodium citrate and acetic acid solution.The simulated lead pastes made from lead containing analytical reagent were also investigated,in compari-son with the spent lead paste.After water bath conditioning,both simulated lead paste and spent lead paste will have a significant difference in term of morphology and filtration performance.The filtration performance of spent lead paste has a larger improvement,with more uniform morphology and larger dimension of 100-200μm,compared with the simulated lead paste.The investigation indicates that water bath conditioning has visible effects on the recrystallization properties of spent lead paste after leaching procedure.