One of the main unit operations in metallurgical processing plant designs is gold leaching. The traditional cyanidation process was chosen and is currently in widespread use. However, the mining sector is looking for lixiviants other than cyanide. Cyanide's effects on the environment have made it difficult for humans and other biotic creatures to survive. There is now research to discover a substitute for this cyanide. It is currently argued that thiosulfate is a preferable substitute for cyanide. The effectiveness of thiosulfate as a leaching agent in carbonaceous gold-bearing ores in Ethiopia is discussed in this paper compared to cyanide. The study has looked into the advantages of employing thiosulfate over cyanide from a technical, and economic standpoint. The leaching effects of both lixiviants on carbonaceous gold-bearing ores extracted from MIDROC Legadembi Open Pit mine in Southern Ethiopia, Oromia region, were examined in a laboratory experiment. After 48 h of leaching, it was discovered that thiosulfate has a better and quicker recovery of 91.54% over 61.70% of cyanide recovery. Tables and graphs are used to demonstrate thiosulfate's technical advantage over cyanide. As a result, this paper provides evidence regarding the Legadembi gold mine in Ethiopia's amenability to thiosulfate leaching on carbonaceous gold-bearing ores. A further research perspective is also sought for thiosulfate leaching in other refractory ores.
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http://dx.doi.org/10.1038/s41598-024-69646-3 | DOI Listing |
Sci Rep
October 2024
South African Institute of Mining and Metallurgy (SAIMM), Johannesburg, South Africa.
One of the main unit operations in metallurgical processing plant designs is gold leaching. The traditional cyanidation process was chosen and is currently in widespread use. However, the mining sector is looking for lixiviants other than cyanide.
View Article and Find Full Text PDFSci Rep
July 2024
School of Mining Engineering, University of Science and Technology Liaoning, Anshan, 114051, China.
The adsorption behavior of gold thiosulfate ions on the surface of kaolinite was studied using a combination of experimental research and quantum chemical calculations. Under the condition of a stirring time of 30 min, a stirring speed of 500 r·min, and a mass ratio of 30% kaolinite in the slurry, when the initial gold concentration of 56.50 mg·L,the adsorption rate of gold-thiosulfate ions from a kaolinite-containing solution was 7.
View Article and Find Full Text PDFInt J Biol Macromol
August 2024
College of Chemistry and Chemical Engineering, Henan Polytechnic University, Jiaozuo 454003, China.
Thiosulfate has been considered as a more environmentally-friendly alternative to cyanide salts for the extraction of gold from gold ores and the development of affordable, green and efficient adsorbents for the isolation of gold-thiosulfate complex (Au(SO)) from the leaching solution remains a significant challenge. To address this issue, chitosan, a natural macromolecule, was selected as a carrier and chemically modified with ionic liquids. The ionic liquids modified chitosan showed greater adsorption capacity towards Au(SO) compared with pristine chitosan.
View Article and Find Full Text PDFMolecules
June 2024
School of Science and Technology, Jiaozuo Teachers College, Jiaozuo 454000, China.
Thiosulfate leaching has been regarded as a promising alternative to cyanidation, but it still faces the challenge of the recovery of low content of gold from high concentrations of thiosulfate solutions. Liquid-liquid extraction is a method to address this issue but is still limited by the use of volatile and toxic organic solvents. To overcome this limitation, this work synthesized some functionalized dicationic ionic liquids (DILs) to serve as extraction solvents for the recovery of the gold-thiosulfate complex, [Au(SO)], from thiosulfate solutions.
View Article and Find Full Text PDFEnviron Sci Pollut Res Int
June 2024
Faculty of Land Resource Engineering, Kunming University of Science and Technology, Kunming, 650500, Yunnan, China.
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