Recovery of copper cyanide from waste cyanide solution by LIX 7950 |
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| Authors: | Feng Xie David Dreisinger |
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| Affiliation: | 1. Department of Chemical Engineering, Tabriz Branch, Islamic Azad University, 51579-44533 Tabriz, Iran;2. Department of Chemistry, Tabriz Branch, Islamic Azad University, 51579-44533 Tabriz, Iran;1. Faculty of Land Resource Engineering, Kunming University of Science and Technology, Kunming, Yunnan, China;2. Faculty of Science, Kunming University of Science and Technology, Kunming, Yunnan, China;1. Key Laboratory of Medicinal Chemistry for Natural Resource (Yunnan University), Ministry of Education, School of Chemical Science and Technology, Yunnan University, No. 2, CuiHu North Road, Kunming 650091, PR China;2. State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming University of Science and Technology, Kunming 650093, PR China |
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| Abstract: | The use of the guanidine extractant, LIX 7950, to extract copper cyanide from waste cyanide solution has been investigated. Copper extraction is favorable at low pH while a high cyanide to copper molar ratio tends to suppress copper loading. The extractant also strongly extracted zinc and nickel from cyanide solution, but the extraction of iron was poor. The presence of thiocyanate ion significantly depressed copper extraction, but thiosulfate ion produced negligible impact on copper extraction. The preferential extraction of metal cyanide species to free cyanide has been noticed. The potential application of the recovery technique as a pre-concentration step for the treatment of cyanide effluent has been suggested, by which copper can be extracted and concentrated into a small volume of solution and the barren cyanide solution recycled to the cyanidation process. |
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