| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
2024 Technical Division Student Poster Contest
|
| Presentation Title |
SPG-3: Enhancing Thiosulfate Stability and pH Control in Ammonium Thiosulfate Gold Leaching with Mg(OH)2 |
| Author(s) |
Sujin Chae, Farzaneh Sadri, Yeonuk Choi, Ahmad Ghahreman |
| On-Site Speaker (Planned) |
Sujin Chae |
| Abstract Scope |
This paper explores the potential of using ammonium thiosulfate leaching as a substitute for cyanidation in gold leaching. Although effective, ammonium thiosulfate leaching requires the reduction of its high thiosulfate consumption to be practical for heap leaching. One limiting factor is ammonia loss, which causes thiosulfate decomposition and eventual pH reduction, resulting in excessive thiosulfate consumption. To address this issue, the low solubility of Mg(OH)2 in alkaline solutions is utilized to produce hydroxide ions via progressive dissolution of Mg(OH)2 during ammonium thiosulfate. This process stabilizes the pH and thiosulfate, and is tested at various concentrations for viability in bench and column scale leaching tests. |
| Proceedings Inclusion? |
Undecided |
| Keywords |
Extraction and Processing, Hydrometallurgy, Magnesium |