Gold extraction from thiosulfate solution using trioctylmethylammonium chloride
Alkyl phosphorus esters, alkyl amines, amine oxides and their mixtures with amines (Hydrometallurgy 46 (1997) 363; Solv. Extr. Ion Exch. 16 (6), (1998) 1407) were used to extract gold from thiosulfate solution but the re-adjustment of pH was required and extraction efficiency was poor in the alkalin...
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Published in | Hydrometallurgy Vol. 73; no. 1; pp. 41 - 53 |
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Main Authors | , , , , |
Format | Journal Article |
Language | English |
Published |
Amsterdam
Elsevier B.V
01.04.2004
Elsevier |
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Abstract | Alkyl phosphorus esters, alkyl amines, amine oxides and their mixtures with amines (Hydrometallurgy 46 (1997) 363; Solv. Extr. Ion Exch. 16 (6), (1998) 1407) were used to extract gold from thiosulfate solution but the re-adjustment of pH was required and extraction efficiency was poor in the alkaline pH range. In this study, trioctylmethylammonium chloride (TOMAC) was used as an extractant to extract gold from thiosulfate leaching solution without pH and other adjustments. The effects of gold concentration, pH, ammonia, thiosulfate and cupric ion concentrations, extractant concentration, diluent and retention time on gold extraction were investigated. It was found that 0.18 mol/L extractant diluted with
n-octane+1-hexanol at O/A ratio of 1:1 could extract more than 99% of gold from the thiosulfate solution at the standard leaching condition (1.0 mol/L S
2O
3
2−, 0.03 mol/L Cu
2+ and 3.0 mol/L NH
3/NH
4
+ at pH 10.2) in 0.6 ks (1 ks=1000 s). The loading capacity and selectivity of the gold extractant, trioctylmethylammonium chloride, were also studied. |
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AbstractList | Alkyl phosphorus esters, alkyl amines, amine oxides and their mixtures with amines were used to extract gold from thiosulfate solution but the re-adjustment of pH was required and extraction efficiency was poor in the alkaline pH range. In this study, trioctylmethylammonium chloride (TOMAC) was used as an extractant to extract gold from thiosulfate leaching solution without pH and other adjustments. The effects of gold concentration, pH, ammonia, thiosulfate and cupric ion concentrations, extractant concentration, diluent and retention time on gold extraction were investigated. It was found that 0.18 mol/L extractant diluted with n-octane+1-hexanol at O/A ratio of 1:1 could extract more than 99% of gold from the thiosulfate solution at the standard leaching condition (1.0 mol/L S2O32-, 0.03 mol/L Cu2+ and 3.0 mol/L NH3/NH4+ at pH 10.2) in 0.6 ks (1 ks=1000 s). The loading capacity and selectivity of the gold extractant, trioctylmethylammonium chloride, were also studied. Alkyl phosphorus esters, alkyl amines, amine oxides and their mixtures with amines (Hydrometallurgy 46 (1997) 363; Solv. Extr. Ion Exch. 16 (6), (1998) 1407) were used to extract gold from thiosulfate solution but the re-adjustment of pH was required and extraction efficiency was poor in the alkaline pH range. In this study, trioctylmethylammonium chloride (TOMAC) was used as an extractant to extract gold from thiosulfate leaching solution without pH and other adjustments. The effects of gold concentration, pH, ammonia, thiosulfate and cupric ion concentrations, extractant concentration, diluent and retention time on gold extraction were investigated. It was found that 0.18 mol/L extractant diluted with n-octane+1-hexanol at O/A ratio of 1:1 could extract more than 99% of gold from the thiosulfate solution at the standard leaching condition (1.0 mol/L S 2O 3 2−, 0.03 mol/L Cu 2+ and 3.0 mol/L NH 3/NH 4 + at pH 10.2) in 0.6 ks (1 ks=1000 s). The loading capacity and selectivity of the gold extractant, trioctylmethylammonium chloride, were also studied. |
Author | Fujita, Toyohisa Kejun, Liu Miyazaki, Toshio Shibayama, Atsushi Yen, Wan Tai |
Author_xml | – sequence: 1 givenname: Liu surname: Kejun fullname: Kejun, Liu organization: Faculty of Engineering and Resource Science, Akita University, Akita, 010-8502, Japan – sequence: 2 givenname: Wan Tai surname: Yen fullname: Yen, Wan Tai organization: Queen's University, Kingston, Ontario, Canada K7L3N6 – sequence: 3 givenname: Atsushi surname: Shibayama fullname: Shibayama, Atsushi organization: Faculty of Engineering and Resource Science, Akita University, Akita, 010-8502, Japan – sequence: 4 givenname: Toshio surname: Miyazaki fullname: Miyazaki, Toshio organization: Faculty of Engineering and Resource Science, Akita University, Akita, 010-8502, Japan – sequence: 5 givenname: Toyohisa surname: Fujita fullname: Fujita, Toyohisa email: tfujita@geosys.t.u-tokyo.ac.jp organization: Race, The University of Tokyo, Tokyo 153-8904, Japan |
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Cites_doi | 10.1080/07366299808934587 10.1016/0304-386X(95)00035-F 10.1016/0304-386X(88)90041-2 10.1016/S0304-386X(01)00225-0 10.1080/08827508808952634 10.2473/shigentosozai.116.291 10.1007/s11663-001-0086-7 10.1016/S0304-386X(97)00059-5 10.1016/S0304-386X(97)00031-5 10.1016/S0304-386X(00)00151-1 10.2473/shigentosozai.116.929 |
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Keywords | Gold Trioctylmethylammonium chloride Solvent extraction Thiosulfate Ammonia Thiosulfates Amine Concentration effect Reagents pH Experimental study Hydrometallurgy |
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Snippet | Alkyl phosphorus esters, alkyl amines, amine oxides and their mixtures with amines (Hydrometallurgy 46 (1997) 363; Solv. Extr. Ion Exch. 16 (6), (1998) 1407)... Alkyl phosphorus esters, alkyl amines, amine oxides and their mixtures with amines were used to extract gold from thiosulfate solution but the re-adjustment of... |
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SubjectTerms | Applied sciences Exact sciences and technology Gold Hydrometallurgy Metals. Metallurgy Production of metals Production of non ferrous metals. Process materials Solvent extraction Thiosulfate Trioctylmethylammonium chloride |
Title | Gold extraction from thiosulfate solution using trioctylmethylammonium chloride |
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