Key factors in chemical reduction by hydrazine for recovery of precious metals
Key factors in chemical reduction by hydrazine for recovery of precious metals
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DOI：
10.1016/s0045-6535(02)00305-3
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发表时间：
2002-10-01
期刊：
影响因子：
8.8
通讯作者：
Lim, LL
中科院分区：
文献类型：
--
作者：
Chen, JP;Lim, LL
大多数常用的金属废物处理方法只能去除金属，最终以污泥的形式丢弃，而无法对金属进行再利用，造成原材料的浪费。本研究采用以肼为还原剂的还原法，研究了间歇式反应器中合成废水中银和铜贵金属的回收。当 pH > 11 时，金属离子的回收率最高。腐殖酸的存在不会对回收过程产生负面影响。肼溶液中溶解氧水平的变化并没有显着影响两种金属的回收率，而晶种和老化过程导致所获得的固体的粒径增加。在Cu2+和Ag+离子竞争条件下，银的回收率保持不变，而铜的回收率有所提高。 (C) 2002 Elsevier Science Ltd. 保留所有权利。
Most of the commonly used metal waste treatment approaches only allow removal of metals which are ultimately discarded as sludge and do not permit the reuse of the metals, resulting in a waste of raw materials. In this study, the recovery of precious metals of sliver and copper in a synthesized wastewater in batch reactors was investigated using a reduction method by hydrazine as the reducing agent. Recovery of metal ions was greatest at pH > 11. The presence of humic acid did not have negative effects on the recovery process. Varying dissolved oxygen levels in the hydrazine solution did not significantly affect the recovery of both metals while seeding and ageing processes resulted in an increase in the particle size of the solid obtained. Under competitive conditions between Cu2+ and Ag+ ions, the recovery of silver remained the same, while that of copper was enhanced. (C) 2002 Elsevier Science Ltd. All rights reserved.