旧镉镍电池湿法回收处理

采用氨水作浸出剂处理镉镍电池 ,分离回收其中Ni、Cd的工艺方法。采用氨水作浸出剂 ,主要考虑浸出液不需进行中和处理 ,不必采用萃取剂萃取分离 ,NH3 易进行回收处理 ,废水可循环利用等特点。实验结果表明 ,在NH3 的浓度足够高的情况下 ,Ni(OH) 2 、Cd(OH) 2 均可与氨水反应 ,迅速溶于氨水 ;而经 5 0 0℃烘烤后所得NiO与CdO却不同 ,NiO几乎不溶于氨水 ,而在合适的 pH值及NH3 的浓度足够高的条件下 ,CdO迅速溶解。根据有关物质的这些溶解特性 ,开发出了新的废旧电池回收工艺。Ni、Cd的浸出率分别达 99 6 %、98 5 %。镉镍电池回收产品的纯度相当高 ,NiO为99 6 % ,Cd(OH) 2 为 99 97%。

The recovery of spent Cd/Ni battery by hydro- metallurgical process

A hydro- metallurgical process to treat wasted Cd/Ni batteries and to recover Ni, Cd elements was studied. NH3 aqueous solution was applied for leaching purpose in this treatment. The treatment did not require neutralization of solution and/or solvent extraction in the separation procedure of Ni ,Cd. The wasted water could be recycled. Experimantal results showed that if NH3 concentration was sufficiently high,Ni(OH)2 and Cd(OH)2 reacted with aqueous NH3 and quickly dissolved into NH3 aqueous solution. On the other hand, after roasted at ＞500℃, NiO did not act quickly with NH3 solution. On the contrary, dissolvingrate of CdO was fast enough if NH3 concentration was sufficiently high and pH of solution was adjusted properly. A new process to recover Ni and Cd from wasted battery was developed based on the features of dissolving characteristices of. NiO and CdO. The recycling rate was 99.6% for Ni and 98.5% for Cd respectively. And the purities of recovered Ni and Cd were 99.6%. and 99.9% respectively.