Selective separation of copper and cadmium from zinc solutions by low current density electrolysis

Copper and cadmium ions were selectively separated from zinc sulphate aqueous solution or zinc ammonia/ammonium sulphate aqueous solution by low current density electrolysis.It was shown that the concentration of cadmium ion in zinc sulphate solution decreased from 4.56 g/L to 0.18 g/L in an electrolysis time of 8.5 h,whilst it decreased from 5.16 g/L to lower than 0.005 g/L in zinc ammonia/ammonium sulphate aqueous solution.On the other hand,the deposition rate of copper was so low that it was difficult to...     

高碱性脉石低品位氧化锌矿低浓度氨浸动力学研究

对高碱性脉石低品位氧化锌矿氨浸动力学进行了研究。结果表明,氧化锌矿氨浸遵循"未反应核缩减"模型,动力学方程遵从1-2a/3-(1-a)2/3=kt,其表观活化能25.84kJ/mol,浸出过程属于固体膜层扩散控制。提高浸出液的浓度、温度,均可加速锌的浸出速度,提高浸出率。     

失效锂离子电池直接空气氧化氨性浸出研究

采用含氨和铵盐(硫酸铵、碳酸铵或氯化铵)的水溶液为浸出介质,在常温下通入空气直接浸出失效锂离子电池中的金属元素。在含铵盐的氨性溶液中,锂、钴的浸出率分别为小于22.4%、12.5%,而铜的浸出率可高达98.86%,有利于铜与锂、钴元素的分离。结果表明,含碳酸铵的氨性溶液浸铜效果最佳。