Results 281 to 290 of about 1,040,720 (337)

The role of oxygen in thiosulphate leaching of gold

Hydrometallurgy, 2007
Abstract The role of oxygen in thiosulphate leaching of gold has been investigated in both pure gold and ore systems. The gold dissolution decreased in the presence of oxygen in the pure gold system. Air or oxygen bubbling caused higher consumption of thiosulphate and leaching passivation. Nitrogen bubbling largely increased gold dissolution and this
D. Feng, J.S.J. van Deventer
openaire   +1 more source

Eco-friendly and reagent recyclable gold extraction by iodination leaching-electrodeposition recovery

Journal of Cleaner Production, 2021
Although iodination gold leaching is a clean, non-toxic and efficient non-cyanide gold leaching process, it still has the problems of high reagents cost and difficult leaching solution treatment.
Qianyu Meng, Xiao Y. Yan, Guichun Li
semanticscholar   +1 more source

A review of factors affecting gold leaching in non-ammoniacal thiosulfate solutions including degradation and in-situ generation of thiosulfate

Hydrometallurgy, 2018
Cyanide has been used for more than a century as a preferred lixiviant for extracting gold from ores and concentrates. While cyanide is very effective in treating certain ores and concentrates, it is not suitable for carbonaceous and high copper-bearing ...
O. Sitando, G. Senanayake, X. Dai, A. Nikoloski, P. Breuer   +4 more
semanticscholar   +1 more source

A study of the leaching of gold and silver by acidothioureation

Hydrometallurgy, 1980
Abstract The method of thiourea leaching for the extraction of gold and silver from ore in acidic medium was studied. The effect of various amounts of oxidant was also investigated. It was found using a rotating disk experiment that when the leaching solution contained 1.0% thiourea, 0.5% sulfuric acid and 0.1% ferric ions, the rate of gold and ...
C.K. Chen, T.N. Lung, C.C. Wan
openaire   +1 more source

Extraction of gold from typical Carlin gold concentrate by pressure oxidation pretreatment - Sodium jarosite decomposition and polysulfide leaching

Hydrometallurgy, 2021
Most of the gold is encapsulated in sulfides and arsenopyrite in Carlin type gold ores; the gold leaching efficiency is less than 8% without pretreatment.
Lei Zhang, Xueyi Guo, Q. Tian, Shui-ping Zhong, Hong Qin   +4 more
semanticscholar   +1 more source

Feasibility of electrokinetic in situ leaching of gold

Hydrometallurgy, 2018
Abstract Conventional gold mining operations are facing significant challenges due to declining ore grades and increasingly higher strip ratios. To meet global demands while limiting associated environmental impacts, alternative techniques to extract resources, including gold, are urgently needed.
Evelien Martens, Henning Prommer, Xianwen Dai, Ming Zhi Wu, Jing Sun, Paul Breuer, Andy Fourie   +6 more
openaire   +1 more source

Improving the gold leaching process of refractory ores using the Jetleach reactor

Minerals Engineering, 2019
Gold ores have been a subject of numerous investigations aimed at enhancing gold recovery and improving leaching kinetics. This is because the cyanidation process cycle, although well established and well researched, remains a process of long duration ...
Jean Jacques Kalombo Mbayo, H. Simonsen, S. Ndlovu   +2 more
semanticscholar   +1 more source

Thiosulfate leaching of gold catalyzed by hexaamminecobalt(III): Electrochemical behavior and mechanisms

Electrochimica Acta, 2021
Thiosulfate is a green gold lixiviant that has promise to replace cyanide at the gold mining industry. Hexaamminecobalt(III) (Co(NH3)63+) is effective in catalyzing the thiosulfate leaching of gold from ores, but the electrochemical behavior and ...
Yan Zhang, Bin Xu, Min-shu Cui, Qian Li, Xiaolian Liu, Tao Jiang, X. Lyu   +6 more
semanticscholar   +1 more source

Leaching of a polymetal gold ore and reducing cyanide consumption using cyanide-glycine solutions

, 2021
Many aspects of gold ores leaching by glycine (C2H5NO2) and glycine-cyanide solutions are still not well understood. The base-metal components have been shown to have a strong impact on gold leaching kinetics.
K. Barani, M. Dehghani, M. Azadi, A. Karrech   +3 more
semanticscholar   +1 more source

Reaction chemistry of gold leaching in thiourea solution for a Turkish gold ore

Hydrometallurgy, 2002
This study was carried out on a finely disseminated gold-bearing ore from Kaymaz, Turkey. The main objective was to determine the mechanism of reaction between thiourea and Fe 31 in the thiourea leaching of gold.
Atalay, U, Orgul, S
exaly   +2 more sources