Chemical precipitation of copper from copper-zinc solutions onto selective sorbents
Chemical precipitation of copper from copper-zinc solutions onto selective sorbents
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DOI：
10.1016/j.hydromet.2008.05.027
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发表时间：
2009-01-01
期刊：
影响因子：
4.7
通讯作者：
Hoell, Wolfgang H.
中科院分区：
文献类型：
--
作者：
Kravchenko, Tamara A.;Polyanskiy, Leo L.;Hoell, Wolfgang H.
研究了以超分散沉淀形式从稀释的Cu2+-Zn2+溶液中选择性吸附和多次浓缩铜。选择性吸附是通过游离碱形式的弱碱性阴离子交换剂来实现的。吸附剂的再生和Cu2+向Cu0的转化是通过树脂相的化学还原进行的。因此，树脂可以重复使用，以吸附更多的铜离子。该过程已在间歇和填充床实验中进行了研究。在多次饱和-还原循环后，观察到金属铜在吸附剂的表面和孔中积累。细分散金属铜的存在导致Cu2+离子的额外吸附，这是由于同步还原-氧化反应。经过几个循环后，铜的总吸收率达到阴离子交换容量的300%以上。(C)2008爱思唯尔B.V.保留所有权利。
The selective sorption and multiple concentration of copper in the form of an ultradisperse precipitate from a diluted Cu2+-Zn2+-solution has been investigated. The selective sorption is accomplished by means of weakly basic anion exchangers in their free base forms. Regeneration of the sorbent and conversion of Cu2+ to Cu-0 is carried out by means of a chemical reduction in the resin phase. Thus the resins can be reused for sorption of further copper ions. The process has been investigated in both, batch and packed bed experiments. After multiple saturation-reduction cycles an accumulation of metallic copper on the surface and in the pores of the sorbent is observed. The presence of finely dispersed metallic copper leads to the additional sorption of the Cu2+ ions due to a synproportional reduction-oxidation reaction. The total uptake of copper after several cycles amounts to more than 300 % of the anion exchange capacity. (C) 2008 Elsevier B.V. All rights reserved.