Abstract The synergistic leaching system using glycine as the main lixiviant with low levels of cyanide as a catalyst has been shown to be an effective approach to leach gold‑copper ores and concentrates, allowing the consumption of cyanide to be remarkably reduced. The recovery of gold from the synthetic cyanide-starved glycine leachate in the presence of copper has been investigated using. It was found that the adsorbed copper was mostly cuprous cyanide. The effects of [CN−]:[CuT] and [Gly]: [CuT] molar ratios were not significant on the adsorption of gold and copper using IXOS-AuC resin. The gold recovery increased, while the copper recovery decreased with the increasing initial gold concentration. The equilibrium and kinetics studies were undertaken, and the experimental adsorption equilibrium and rate data showed an excellent fit using the Freundlich isotherm and pseudo-second-order models respectively. Elution tests showed that the loaded copper can be selectively pre-eluted over gold by 0.4 M NaCN at pH 11.5. Gold can be effectively eluted by either acidic thiourea or alkaline thiocyanate. The multi-cycle adsorption/elution tests showed that the resin can be effectively regenerated by both acidic thiourea and alkaline thiocyanate, with an insignificant decrease in adsorption and elution efficiency over 3 adsorption/elution cycles. From SEM analysis, the change of surface morphology of the resin was not significant after adsorption and the adsorption/elution cycles.

中文翻译：

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使用分子印迹树脂 (IXOS-AuC) 在 Cu 存在下从氰化物缺乏的甘氨酸溶液中回收金

摘要 以甘氨酸为主要浸出剂、氰化物含量低为催化剂的协同浸出系统已被证明是一种有效的浸出金铜矿石和精矿的方法，可以显着降低氰化物的消耗。已经研究了在铜存在下从合成氰化物缺乏的甘氨酸浸出液中回收金的方法。发现吸附的铜主要是氰化亚铜。[CN-]:[CuT] 和 [Gly]:[CuT] 摩尔比对使用 IXOS-AuC 树脂吸附金和铜的影响不显着。随着初始金浓度的增加，金回收率增加，而铜回收率下降。进行了平衡和动力学研究，实验吸附平衡和速率数据分别使用 Freundlich 等温线和伪二阶模型显示出极好的拟合。洗脱测试表明，负载的铜可以在 pH 11.5 的情况下被 0.4 M NaCN 选择性地在金上预洗脱。酸性硫脲或碱性硫氰酸盐均可有效洗脱金。多循环吸附/洗脱试验表明，酸性硫脲和碱性硫氰酸盐均可有效再生树脂，3次吸附/洗脱循环后吸附和洗脱效率没有明显下降。从SEM分析可知，吸附和吸附/洗脱循环后树脂表面形貌的变化不显着。洗脱测试表明，负载的铜可以在 pH 11.5 的情况下被 0.4 M NaCN 选择性地在金上预洗脱。酸性硫脲或碱性硫氰酸盐均可有效洗脱金。多循环吸附/洗脱试验表明，酸性硫脲和碱性硫氰酸盐均可有效再生树脂，3次吸附/洗脱循环后吸附和洗脱效率没有明显下降。从SEM分析可知，吸附和吸附/洗脱循环后树脂表面形貌的变化不显着。洗脱测试表明，负载的铜可以在 pH 11.5 的情况下被 0.4 M NaCN 选择性地在金上预洗脱。酸性硫脲或碱性硫氰酸盐均可有效洗脱金。多循环吸附/洗脱试验表明，酸性硫脲和碱性硫氰酸盐均可有效再生树脂，3次吸附/洗脱循环后吸附和洗脱效率没有明显下降。从SEM分析可知，吸附和吸附/洗脱循环后树脂表面形貌的变化不显着。在 3 个吸附/洗脱循环中吸附和洗脱效率没有显着降低。从SEM分析可知，吸附和吸附/洗脱循环后树脂表面形貌的变化不显着。在 3 个吸附/洗脱循环中吸附和洗脱效率没有显着降低。从SEM分析可知，吸附和吸附/洗脱循环后树脂表面形貌的变化不显着。