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Highly Efficient Recovery of Au(I) from Gold Leaching Solution Using Sodium Dimethyldithiocarbamate
ACS Omega ( IF 3.7 ) Pub Date : 2024-04-26 , DOI: 10.1021/acsomega.4c01941
Peng Yang 1, 2 , Xinrong Li 1 , Shuliang Chen 1 , Futing Zi 2 , Xianzhi Hu 2
Affiliation  

As a sustainable, nontoxic and environmentally friendly cyanide-free gold leaching agent, thiosulfate has been applied to some extent in the field of hydrometallurgy. However, the difficult recovery of gold ions in gold leaching solutions limits further application of thiosulfate gold leaching technology. This study demonstrated the feasibility of gold recovery by sodium dimethyldithiocarbamate (SDD) precipitation and recycling of ammonia and a lixiviant in solution. SDD achieved the purpose of recovering gold by forming granular precipitates with gold ions in solution. It can almost completely recover gold ions in 2.5–17.34 mg/L of gold leaching solution within 1 min at 25 °C, in which a gold recovery capacity of 7.99 kg/t is achieved. The leaching rate of gold ore did not change significantly after recycling the residual ammonia and thiosulfate in the leaching solution after gold recovery by SDD, and its leaching rate basically remained at 81%. The mechanism of SDD recovering Au was determined to involve the ligand exchange of SDD and Au[(S2O3)2]3–. Moreover, the interaction mechanism between SDD and Au(I) was further validated by density functional theory calculations. Considering its low cost, simple technology, and environmental friendliness, the SDD precipitation process has the potential for large-scale application in gold recovery from thiosulfate gold leaching solutions.

中文翻译:


使用二甲基二硫代氨基甲酸钠从金浸出液中高效回收 Au(I)



硫代硫酸盐作为一种可持续、无毒、环保的无氰浸金剂,在湿法冶金领域得到了一定的应用。但浸金液中金离子回收困难,限制了硫代硫酸盐浸金技术的进一步应用。这项研究证明了通过二甲基二硫代氨基甲酸钠 (SDD) 沉淀以及溶液中氨和浸滤剂的回收来回收金的可行性。 SDD是通过与溶液中的金离子形成颗粒状沉淀来达到回收金的目的。在25℃下1min内几乎可以完全回收2.5~17.34mg/L金浸出液中的金离子,金回收能力达到7.99kg/t。 SDD回收金后浸出液中残留的氨和硫代硫酸盐回收后,金矿石的浸出率没有明显变化,浸出率基本保持在81%。 SDD回收Au的机制被确定涉及SDD 和Au[(S 2 O 3 ) 2 ] 3–的配体交换。此外,通过密度泛函理论计算进一步验证了SDD与Au(I)之间的相互作用机制。 SDD沉淀工艺成本低、工艺简单、环境友好,在硫代硫酸盐浸金液中回收金具有大规模应用的潜力。
更新日期:2024-04-26
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