Results 271 to 280 of about 1,040,720 (337)

A sequential leaching procedure for efficient recovery of gold and silver from waste mobile phone printed circuit boards.

Waste Management, 2022
The present study reports a sequential, non-acid process for effective recovery of copper and precious metals from mobile phone printed circuit boards. In this process, gold and silver were first enriched during the synthesis process of cuprous chloride ...
Zhi-yuan Zhang, Lixiang Wu, Kai He, Fu-Shen Zhang   +3 more
semanticscholar   +1 more source

Anaerobic thiosulfate leaching: Development of in situ gold leaching systems

Minerals Engineering, 2008
Ferric EDTA and ferric oxalate complexes are both effective oxidants for the aerobic and anaerobic dissolution of gold in thiosulfate solutions, and therefore are potential candidates for the development of an in situ leaching system. The thiosulfate and polythionates were quantified during leaching using HPLC with perchlorate eluent and an anion ...
J.A. Heath, M.I. Jeffrey, H.G. Zhang, J.A. Rumball   +3 more
openaire   +1 more source

A fundamental study of gold leaching in a thiosulfate‑oxygen‑copper system in the presence of activated carbon

, 2020
Activated carbon has been found to significantly enhance the dissolution of gold in a thiosulfate‑oxygen‑copper system. Leaching tests using gold powder showed that the gold dissolution in a thiosulfate‑oxygen‑copper system in the absence of activated ...
O. Sitando, X. Dai, G. Senanayake, A. Nikoloski, P. Breuer   +4 more
semanticscholar   +1 more source

Gold Leaching in an Alkaline Thiourea Solution

Journal of The Electrochemical Society, 1999
Gold 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, Liyuan Chai, Ryoichi Ichino, Masazumi Okido   +3 more
openaire   +1 more source

Recycling copper and gold from e-waste by a two-stage leaching and solvent extraction process

, 2021
The recycling of metals such as gold and copper from discarded end-of-life electronic waste (e-waste or WEEE) is an important aspect to the development of environmentally benign manufacturing processes that exhibit circularity in materials flow. Global e-
Mudila Dhanunjaya Rao, K. Singh, C. Morrison, J. Love   +3 more
semanticscholar   +1 more source

Effect of hematite on thiosulphate leaching of gold

International Journal of Mineral Processing, 2007
Abstract 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
openaire   +1 more source

A Review of Ammoniacal Thiosulfate Leaching of Gold: An Update Useful for Further Research in Non-cyanide Gold Lixiviants

Mineral Processing and Extractive Metallurgy Review, 2016
This literature review provides an update of ammoniacal thiosulfate as a potential lixiviant of gold, the history of thiosulfate leaching and recent progress on thiosulfate leaching of gold, as well as the production, oxidation, and stabilization of ...
G Senanayake
exaly   +1 more source

Comparative life cycle assessment of copper and gold recovery from waste printed circuit boards: Pyrometallurgy, chemical leaching and bioleaching.

Journal of Hazardous Materials
Printed circuit boards (PCBs) make up a substantial amount of electronic waste (e-waste) generated annually. Waste PCBs contain high quantities of copper and gold in comparison to natural ores.
Eric Schwartz, Haoyang He, Kali Frost, Bichlien H Nguyen, O. Ogunseitan, J. Schoenung   +5 more
semanticscholar   +1 more source

Developments in Gold Leaching: A Literature Survey

Mineral Processing and Extractive Metallurgy Review, 1990
The 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
openaire   +1 more source

Mineral phase and structure changes during roasting of fine-grained carbonaceous gold ores and their effects on gold leaching efficiency

Chinese Journal of Chemical Engineering, 2019
While roasting has been widely applied to reduce the negative effect of carbonaceous matters on gold extraction from fine-grained carbonaceous gold ores, the phase and structure changes of minerals during roasting and their influences on the leaching ...
J. Jin, Yue-xin Han, H. Li, Yang Huai, Yongjun Peng, Xiaotian Gu, Wei Yang   +6 more
semanticscholar   +1 more source