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Novel Extraction Process for Gold Recovery from Thiosulfate Solution Using Phosphonium Ionic Liquids
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2021-06-07 , DOI: 10.1021/acssuschemeng.1c01705 Harshit Mahandra 1 , Fariborz Faraji 1 , Ahmad Ghahreman 1
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2021-06-07 , DOI: 10.1021/acssuschemeng.1c01705 Harshit Mahandra 1 , Fariborz Faraji 1 , Ahmad Ghahreman 1
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A novel and sustainable technology to recover gold from thiosulfate medium using ionic liquids, i.e., Cyphos IL 101 (Cy IL 101) and Cyphos IL 102 (Cy IL 102) diluted in toluene, has been developed. Gold was extracted into the ionic liquid phase as [{P66614+}3{Au(S2O3)23–}] and stripped using NaCl solution. The recyclability of ionic liquids has shown promising recirculation of the solvents for the extraction of gold from thiosulfate medium. Gold was quantitatively extracted from 0.2 mol/L sodium thiosulfate initially containing 10 mg/L gold at pH = 9.0 with 1.25 mmol/L ionic liquid (Cy IL 101 or Cy IL 102) in one stage at A/O = 2, whereas total gold stripping with 1.5 mol/L NaCl also needed one stage at A/O = 1. Using a high A/O ratio in the extraction stage (A/O = 10) and low (A/O = 1/10) in the stripping stage confirmed the economic and environmental viability of the process. The results revealed that Cy IL 101 presents slightly better behavior toward gold recovery than Cy IL 102 and is a viable and promising alternative to recover gold from the thiosulfate medium on a pilot scale. The overall study confirmed the suitability of the developed scheme for industrial application to provide economic and environmental benefits.
中文翻译：
鏻离子液体从硫代硫酸盐溶液中提取金的新工艺
已开发出一种使用离子液体（即 Cyphos IL 101 (Cy IL 101) 和 Cyphos IL 102 (Cy IL 102) 在甲苯中稀释）从硫代硫酸盐介质中回收金的新型可持续技术。金以 [{P 66614 + } 3 {Au(S 2 O 3 ) 2 3–}] 并使用 NaCl 溶液剥离。离子液体的可回收性表明，从硫代硫酸盐介质中提取金的溶剂循环很有前景。在 A/O = 2 的一个阶段，从最初含有 10 mg/L 金的 0.2 mol/L 硫代硫酸钠在 pH = 9.0 和 1.25 mmol/L 离子液体（Cy IL 101 或 Cy IL 102）中定量提取金，而总共用 1.5 mol/L NaCl 剥离金也需要在 A/O = 1 的一个阶段。在萃取阶段使用高 A/O 比 (A/O = 10)，在萃取阶段使用低 (A/O = 1/10)汽提阶段证实了该过程的经济和环境可行性。结果表明，与 Cy IL 102 相比，Cy IL 101 对金回收的表现略好，是一种可行且有前景的替代方案，可在中试规模上从硫代硫酸盐介质中回收金。
更新日期：2021-06-21
中文翻译：
鏻离子液体从硫代硫酸盐溶液中提取金的新工艺
已开发出一种使用离子液体（即 Cyphos IL 101 (Cy IL 101) 和 Cyphos IL 102 (Cy IL 102) 在甲苯中稀释）从硫代硫酸盐介质中回收金的新型可持续技术。金以 [{P 66614 + } 3 {Au(S 2 O 3 ) 2 3–}] 并使用 NaCl 溶液剥离。离子液体的可回收性表明，从硫代硫酸盐介质中提取金的溶剂循环很有前景。在 A/O = 2 的一个阶段，从最初含有 10 mg/L 金的 0.2 mol/L 硫代硫酸钠在 pH = 9.0 和 1.25 mmol/L 离子液体（Cy IL 101 或 Cy IL 102）中定量提取金，而总共用 1.5 mol/L NaCl 剥离金也需要在 A/O = 1 的一个阶段。在萃取阶段使用高 A/O 比 (A/O = 10)，在萃取阶段使用低 (A/O = 1/10)汽提阶段证实了该过程的经济和环境可行性。结果表明，与 Cy IL 102 相比，Cy IL 101 对金回收的表现略好，是一种可行且有前景的替代方案，可在中试规模上从硫代硫酸盐介质中回收金。
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