Recovery of valuable metals from electronic and galvanic industrial wastes by leaching and electrowinning
Recovery of valuable metals from electronic and galvanic industrial wastes by leaching and electrowinning
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DOI：
10.1016/s0956-053x(02)00157-5
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发表时间：
2003-01-01
期刊：
影响因子：
8.1
通讯作者：
Ubaldini, S
中科院分区：
文献类型：
--
作者：
Vegliò, F;Quaresima, R;Ubaldini, S
本文报道了在实验室规模上进行的从电子和电镀工业废料中回收有价金属的处理研究。通过XRD、SEM、EDX和化学分析对污泥进行了表征，结果表明污泥中含有较高的金属含量，如Cu、Ni、Mn、Pb、Sn、W。然后提出了一种浸出工艺，再加上电解，以减少废物的体积，并选择性地回收有价值的金属，如铜和镍。在浸出步骤中，通过使用H2SO 4进行，几个因素进行了研究（酸浓度，温度和时间的处理）。浸出液已成功地用电解法处理，回收铜和镍。铜和镍的沉积分别在酸性和碱性条件下进行。法拉第产率约为95%。回收每公斤铜和镍的能耗分别为2.13和4.43千瓦时。在该过程结束时，在阴极处回收了约94-99%的Cu和Ni的初始含量。实验结果表明了该工艺的技术可行性。(C)2002爱思唯尔科技有限公司版权所有。
In the present paper, a study on laboratory scale to perfonn a treatment for valuable metals recovery from electronic and galvanic industrial wastes, is reported. The characterisation of the waste, performed by XRD, SEM, EDX and chemical analysis, showed a high metals content in the sludge, such as Cu, Ni, Mn, Pb, Sn, W. A leaching process, coupled by electrowinning, is then proposed in order to reduce the volume of the waste material and to recover selectively valuable metals, such as Cu and Ni. During the leaching step, carried out by using H2SO4, several factors were investigated (acid concentration, temperature and time of treatment). The leached liquor has been successfully treated with an electrowinning process, to recover copper and nickel. The copper and nickel depositions, were performed in acid and alkaline conditions, respectively. The Faraday yield was of about 95%. The energy consumption was 2.13 and 4.43 kWh per kg of copper and nickel recovered, respectively. At the end of the process, about 94-99% of the initial content of Cu and Ni was recovered at the cathode. The experimental results obtained, showed the technical feasibility of the process. (C) 2002 Elsevier Science Ltd. All rights reserved.