2016-Sustainable Industrial Processing Summit
SIPS 2016 Volume 8: Non-ferrous, Rotary Kiln, Ferro-alloys, Rare Earth, Coal
| Editors: | Kongoli F, Xueyi G, Shumskiy V, Kozlov P, Capiglia C, Silva AC, Turna T |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2016 |
| Pages: | 350 pages |
| ISBN: | 978-1-987820-50-8 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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Feasibility study on extraction of copper and cyanide from waste cyanide solutions with emulsion liquid membrane
Feng Xie1;1, Shenyang, China;
Type of Paper: Regular
Id Paper: 370
Topic: 6
Abstract:
The feasibility of using emulsion liquid membranes (ELMs) with the guanidine extractant LIX 7950 as the mobile carrier for detoxifying copper-containing waste cyanide solutions has been determined. Various parameters affecting the extraction efficiency of copper and cyanide by ELMs have been examined. Under moderate stirring speed and suitable stirring time, mixing of ELMs and the external feed solution exhibits an insignificant effect on the ELM stability. Effective extraction of copper cyanides by ELMs only occurs at pH below 11. High copper concentration in the external phase and high volume ratio of the external phase to ELMs result in high transport of copper and cyanide. The high molar ratio of cyanide to copper tends to suppress copper extraction by ELMs. The presence of thiocyanate ion significantly depresses the transport of copper and cyanide through the membrane while the thiosulfate ion produced less impact on copper removal by ELMs. Zinc and nickel cyanides can also be effectively extracted by ELMs and a selectivity order of Zn>Ni>Cu>Fe with ELMs has been confirmed.