Ion exchange resins for gold cyanide extraction containing a piperazine functionality, 2 Study of the gold extraction reaction
Ion exchange resins for gold cyanide extraction containing a piperazine functionality, 2 Study of the gold extraction reaction
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DOI：
10.1002/1439-2054(20010501)286:5
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发表时间：
2001-05
影响因子：
3.9
通讯作者：
A. Warshawsky;N. Kahana;V. Kampel;I. Rogachev;R. M. Kautzmann;J. Cortina;C. Sampaio
中科院分区：
文献类型：
--
作者：
A. Warshawsky;N. Kahana;V. Kampel;I. Rogachev;R. M. Kautzmann;J. Cortina;C. Sampaio
离子交换技术是一种替代活性碳回收氰化金的技术。描述了一种新型的离子交换树脂(PS-PIP)，该树脂含有哌嗪基团，连接到苯乙烯-二乙烯基苯大孔网络上。PS-PIP树脂对Au(CN)-2和其他金属氰化物的萃取涉及三种金属萃取模式：树脂的质子化仲胺基团(在酸性pH条件下)、树脂的游离胺基团(在中性和碱性pH值下)和一小部分季铵盐基参与了金的萃取机理。通过对金属负载聚合物的红外光谱和XPS光谱分析，结合批量实验所得的金属萃取物数据，研究了金氰胺在聚合物哌嗪上的萃取反应。金的萃取等温线表明，在碱性溶液中，金的结合量为40-60 mg Au/g树脂，在酸性溶液中，金的结合量高达150 mg Au/g树脂。用氢氧化钠的乙醇/水溶液或0.5mol/L硫脲的硫酸溶液可有效地从树脂中反萃金。
Ion exchange technology is offered as an alternative to activated carbon for gold cyanide recovery. A new type of ion-exchange resin (PS-PIP) incorporating a piperazine group, linked to a styrene-divinylbenzene macroporous network, is described. The extraction of Au(CN) - 2 and other metal cynadines with the PS-PIP resin involves three modes of metal extraction: the protonated secondary amine groups of the resin (at acidic pH conditions), the free amine groups of the resin (at neutral and basic pH values) and the small portion of the quatenary ammonium groups participate in the gold extraction mechanism. The gold cynadine extraction reaction on the polymeric piperazine was studied by a combination of metal extraction data, from batch experiments, and IR and XPS spectroscopic analysis of the metal loaded polymers. Extraction isotherms of gold cynadine show that gold binding is possible from 40-60 mg Au/g of resin in alkaline solutions, up to 150 mg Au/g of resin in acidic solutions. Efficient stripping of gold from the resin was achived using ethanol/water solutions of sodium hydroxide, or 0.5 mol/l thiourea in sulfuric acid solutions.