| Anodic dissolution of gold in alkaline solutions containing thiourea, thiosulfate and sulfite ions |
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| 作者姓名： | 柴立元 |
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| 作者单位： | [1]CenterforIntegratedResearchinScienceandEngineering,NagoyaUniversity,Nagoya464－8603,Japan [2]DepartmentofMetallurgicalScience＆Engineering,CentralSouthUniversity,Changsha410083,China |
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| 摘 要： | Gld dissolves electrochemically in alkaline solutions containing ligands to form complex ions with gold ion.Therefore,selective leaching of noble metals is expected without dissolution of base metals such as steels,aluminum alloys in scrap treatment.Gold electrodes were investigated using linear sweep voltammetry,EQCM method and potentiostatic eclectrolysis in alkaline solutions containing thiourea,Na2SO3 and Na2S2O3.The solution composition,electrode potential affect gold dissolution rate and current efficiency.The gold dissolved from anode electrode forms complex ions,suspension particles as compound precipitates and deposits on cathode electrode as a metal.Anodic efficiency for gold dissolution is between 10% and 22%.This is caused by the oxidation decomposition of sulfite ions and thiourea.The statbility of the alkaline solution containing these elements was also estimated by capillary electrophoresis technique.
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| 关 键 词： | 炼金 亚硫酸铁 阳极溶解 浸出 硫脲 硫代硫酸盐 |
Anodic dissolution of gold in alkaline solutions containing thiourea, thiosulfate and sulfite ions |
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| M.Okido,M.Ishikawa.Anodic dissolution of gold in alkaline solutions containing thiourea, thiosulfate and sulfite ions[J].Transactions of Nonferrous Metals Society of China,2002,12(3):519-523. |
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| Authors: | MOkido MIshikawa |
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| Abstract: | Gold dissolves electrochemically in alkaline solutions containing ligands to form complex ions with gold ion. Therefore, selective leaching of noble metals is expected without dissolution of base metals such as steels, aluminum alloys in scrap treatment. Gold electrodes were investigated using linear sweep voltammetry, EQCM method and potentiostatic electrolysis in alkaline solutions containing thiourea, Na2SO3 and Na2S2O3. The solution composition, electrode potential affect gold dissolution rate and current efficiency. The gold dissolved from anode electrode forms complex ions, suspension particles as compound precipitates and deposits on cathode electrode as a metal. Anodic efficiency for gold dissolution is between 10% and 22%. This is caused by the oxidation decomposition of sulfite ions and thiourea. The stability of the alkaline solution containing these elements was also estimated by capillary electrophoresis technique. |
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| Keywords: | gold selective dissolution sulfite alkaline thiourea solution |
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