Recovery of platinum group metal value via potassium iodide leaching
Recovery of platinum group metal value via potassium iodide leaching
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DOI：
10.1016/j.hydromet.2015.08.008
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发表时间：
2015-10-01
期刊：
影响因子：
4.7
通讯作者：
Dawson, Richard
中科院分区：
文献类型：
--
作者：
Patel, Anant;Dawson, Richard
研究了从废旧聚合物电解液燃料电池(PEMFC)等二次源中回收铂的方法，包括在不同碘含量的脱氧4 4M碘化钾中电积和化学溶解。该领域以前的研究表明，从模型系统中完全回收铂是可能的，但需要进一步研究，以确定使用含铂装置的工艺可行性。本文研究了铂黑在电化学石英晶体微天平(EQCM)上的浸出速率，以及从未测试和报废的聚合物电解质膜燃料电池中有效回收铂的情况。铂黑的溶解速度依赖于添加的碘含量，较高的浓度加速了反应。通过王水消解测定，未测试和报废的质子交换膜燃料电池的铂回收率分别为98.7%和96.7%。结果表明，较高的碘浓度持续提高了回收效率，但增加5 mM以上的碘浓度对回收率的改善相对较小。(C)2015年提交人。爱思唯尔出版公司(Elsevier B.V.)
Platinum recovery from secondary sources such as end-of-life polymer electrolyte fuel cells (PEMFCs) via electro-winning and chemical dissolution in deoxygenated 4 4 M potassium iodide with varying added iodine content was investigated. Previous research in this field has shown that complete platinum recovery from model systems is possible, but further study was necessary to determine the process viability with Pt containing devices. The work presented here investigated the leach rate of platinum black deposited on an electrochemical quartz crystal microbalance (EQCM) as well as the effective recovery of Pt from untested and end-of-life polymer electrolyte membrane fuel cells. Platinum black dissolution rates were found to be dependent on added iodine content, with higher concentrations accelerating the reaction. Platinum recovery from leached materials, as determined by aqua regia digestion, was found to be 98.7% and 96.7% for untested and end-of-life PEMFCs, respectively. Results indicate that higher iodine concentrations continuously improved recovery efficiency, but increasing iodine concentration above 5 mM resulted in comparatively minor improvements. (C) 2015 The Authors. Published by Elsevier B.V.