Results 211 to 220 of about 11,921 (264)
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Effect of galena on thiosulfate leaching of gold
Hydrometallurgy, 2017Abstract Galena and reference quartz were artificially added into the ammoniacal thiosulfate solution to clarify the role of galena on thiosulfate leaching of gold. The effects of galena on thiosulfate decomposition and gold leaching and the possible effect mechanisms were studied by the thermodynamic calculation, leaching tests, SEM-EDS and XPS ...
Xiaoliang Liu, Bin Xu, Yan Zhang
exaly +2 more sources
Radiotracer investigation in gold leaching tanks
Applied Radiation and Isotopes, 2012Measurement and analysis of residence time distribution (RTD) is a classical method to investigate performance of chemical reactors. In the present investigation, the radioactive tracer technique was used to measure the RTD of aqueous phase in a series of gold leaching tanks at the Damang gold processing plant in Ghana.
C P K, Dagadu +4 more
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Gold Leaching with Humic Substances
Journal of Mining Science, 2019The study results of gold leaching using the products of humic acids, as well as stage-by-stage fractionation of parent and gold-containing substances of these acids are presented. The gold content in the pregnant solution was up to 14–30 mg/l. Chemical analysis of the supernatant obtained by a stepwise change in pH of the solution and subsequent ...
A. V. Zashikhin, M. L. Sviridova
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Gold Leaching in an Alkaline Thiourea Solution
Journal of The Electrochemical Society, 1999Gold leaching by thiourea has been investigated in an alkaline solution. In the presence of both Na 2 SO 3 and Na 2 S 2 O 8 , the chemical dissolution of gold can be accomplished in the alkaline thiourea solution. It was found that used as a buffer, SO 2- 3 can prevent thiourea from further decomposing into some insoluble species in contact with the
Dawei Wei +3 more
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Effect of hematite on thiosulphate leaching of gold
International Journal of Mineral Processing, 2007Abstract Hematite, as a typical iron oxide slime in sulphide ore slurries, was artificially added into the leaching systems of pure gold and a sulphide ore respectively, in an attempt to investigate the effect of iron oxide slimes on the ammoniacal thiosulphate leaching of gold.
D. Feng, J.S.J. van Deventer
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Developments in Gold Leaching: A Literature Survey
Mineral Processing and Extractive Metallurgy Review, 1990The gold industry has seen intense activity in the areas of exploration and metallurgy'in recent years. Many developments have taken piace through which ore bodies that were once considered uneconomical to exploit are becoming economical grade. Even the traditional cyanidation process has been modified during the course of time to make it more ...
A. R. UDUPA, S. K. KAWATRA, M. S. PRASAD
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The role of oxygen in thiosulphate leaching of gold
Hydrometallurgy, 2007Abstract 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
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A study of the leaching of gold and silver by acidothioureation
Hydrometallurgy, 1980Abstract 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
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Feasibility of electrokinetic in situ leaching of gold
Hydrometallurgy, 2018Abstract 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 +6 more
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Alternative Leaching Reagents for Gold
1991Sodium cyanide has been the preponderant leaching reagent for gold due to its excellent extractions from a great variety of ores and its low cost. Although cyanide is poisonous, it has safe industrial and environmental records at the high pH range required in cyanide leaching. In addition, the low concentrations of cyanide used in gold milling and heap
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