Abstract A novel leaching process has been reported in this paper to extract silver from silver-bearing residue, which was obtained by low-temperature roasting and sulfuric acid leaching of sphalerite direct leaching residue after sulfur separation. The silver in the silver-bearing residue primarily existed in the form of silver chloride by energy dispersive spectrometer (EDS) analysis. The extraction of silver from silver-bearing residue was investigated by using a choline chloride aqueous solution (ChCl-H2O solution). The results showed that 86.91% of silver in the residue was extracted at a liquid-solid ratio of 12–1, leaching temperature of 65 °C, molar ratio of ChCl to H2O of 1–4 and leaching time of 90 min. In addition, the mechanism of silver deposition on the copper surface in choline chloride leaching solution was determined by ultraviolet-visible (UV–vis) absorbance curves and cyclic voltammetry (CV) analysis. When deposited at 65 °C for 210 min, the deposition of silver on copper in the choline chloride leaching solution could reach 0.407 mg/cm2.

中文翻译：

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氯化胆碱水溶液从含银残留物中浸出银和银在铜上的持续沉积

摘要 本文报道了一种从含银渣中提取银的新浸出工艺，该渣是将闪锌矿直接浸出硫分离后的残渣通过低温焙烧和硫酸浸出获得的。通过能谱仪 (EDS) 分析，含银残留物中的银主要以氯化银的形式存在。使用氯化胆碱水溶液（ChCl-H2O 溶液）研究了从含银残留物中提取银的过程。结果表明，在液固比为 12-1、浸出温度为 65°C、氯化氯与水的摩尔比为 1-4、浸出时间为 90 分钟的条件下，残渣中银的提取率为 86.91%。此外，通过紫外-可见（UV-vis）吸收曲线和循环伏安法（CV）分析确定氯化胆碱浸出液中铜表面银沉积的机制。当在 65°C 下沉积 210 min 时，氯化胆碱浸出液中银在铜上的沉积量可达 0.407 mg/cm2。