Results 261 to 270 of about 1,040,720 (337)

Kinetic studies of gold leaching from a gold concentrate calcine by thiosulfate with cobalt-ammonia catalysis and gold recovery by resin adsorption from its pregnant solution

Separation and Purification Technology, 2019
The leaching of gold from a gold concentrate calcine using a novel thiosulfate leaching method that utilizes cobalt-ammonia complex as the oxidant in place of the traditional copper-ammonia catalysis was investigated.
Bin Xu, Xiaoliang Liu
exaly   +2 more sources

Thiosulfate leaching of gold—A review

Minerals Engineering, 2001
Abstract The ammoniacal thiosulfate leaching process for gold and silver extraction has been reviewed in terms of leaching mechanism, thermodynamics, thiosulfate stability, and gold recovery options. The application to different ore types and process options have also been discussed.
M.G Aylmore, D.M Muir
exaly   +2 more sources

ETHODOLOGICAL FOUNDATIONS OF ELECTROCHEMICAL GOLD LEACHING

News of the Tula state university. Sciences of Earth
The results of a study of new technologies for extracting goldfrom stubborn raw materials in filtration columns with modeling of leaching processes are presented. The prospects of electrochemical methods of metal extraction from solutions with a combination of electrochemical softening of solutions with electrodialysis desalination and concentration ...
V. Golik
openaire   +2 more sources

Gold recovery from cyanidation residue by chloride leaching and carbon adsorption – Preliminary results from CICL process

Hydrometallurgy
There is a vast amount of globally underutilized low-grade mine tailings and leach residues, including those from primary processing of gold. In this research, the target is to recover the remaining gold (10.9 g/t) from weathered refractory iron-rich ...
Anssi Karppinen, Sipi Seisko, Laura Nevatalo, Benjamin P. Wilson, K. Yliniemi, Mari Lundström   +5 more
semanticscholar   +2 more sources

Thiourea–thiocyanate leaching system for gold

Hydrometallurgy, 2011
Abstract The leaching of gold in thiourea–thiocyanate solutions has been studied by the rotating-disc technique using ferric sulfate as oxidant. The effects of initial concentrations of ferric, thiourea (Tu) and thiocyanate as well as temperature and pH on gold leaching rates were studied. An initial gold leaching rate in the order of 10− 9 mol cm− 2 
Xiyun Yang, Michael S. Moats, Jan D. Miller, Xuming Wang, Xichang Shi, Hui Xu   +5 more
openaire   +2 more sources

Alkaline sulfide gold leaching kinetics

Minerals Engineering, 2016
Abstract Recently, leaching of gold with cyanide has come under scrutiny for its possible detrimental effects to the environment. Also, in some gold bearing ores and concentrates, conventional cyanide leaching is not the best method for gold extraction.
exaly   +2 more sources

Identification of elements hindering gold leaching from gold-bearing dust and selection of gold extraction process

Hydrometallurgy, 2021
The gold-bearing dust generated during the roasting process of refractory gold concentrates is valuable as a secondary gold resource. In this study, the effects of different pre-treatment methods on the removal of harmful elements and gold extraction ...
Pan Cao, Shuanghua Zhang, Yajie Zheng, Shen-zhi Lai, Ge Liang, Xing-jun Wang, Bing Tan   +6 more
semanticscholar   +1 more source

Thiosulfate leaching of gold from waste mobile phones

Journal of Hazardous Materials, 2010
The present communication deals with the leaching of gold from the printed circuit boards (PCBs) of waste mobile phones using an effective and less hazardous system, i.e., a copper-ammonia-thiosulfate solution, as an alternative to the conventional and ...
Jae-Chun Lee, Jinki Jeong
exaly   +2 more sources

Radiotracer investigation in gold leaching tanks

Applied Radiation and Isotopes, 2012
Measurement 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, E H K, Akaho, K A, Danso, Z, Stegowski, L, Furman   +4 more
openaire   +2 more sources

Gold leaching from oxide ores in alkaline glycine solutions in the presence of permanganate

, 2020
In this study, the effect of using strong oxidants with alkaline glycine solutions on the leach rate and recovery of gold was studied in the absence of cyanide. Prior research indicated that when using only alkaline glycine and air at ambient temperature
E. Oraby, J. J. Eksteen, G. M. O'Connor
semanticscholar   +1 more source