Results 291 to 300 of about 3,664,205 (338)

‘Green’ leaching: recyclable and selective leaching of gold-bearing ore in an ionic liquid

Green Chem., 2004
The recovery of gold and silver from ore in an ionic liquid is reported for the first time. The 1-butyl-3-methyl-imidazolium hydrogen sulfate ionic liquid (bmim+HSO4−) was employed, with iron(III) sulfate oxidant and thiourea added. Selective extraction of gold (≥85%) and silver (≥60%) from powdered ore (of dominantly chalcopyrite/pyrite/pyrrhotite ...
Whitehead, Jacqueline A., Lawrance, Geoffrey A., McCluskey, Adam   +2 more
openaire   +1 more source

Selective leaching and recovery of phosphorus from incinerated sewage sludge ash with CaO addition.

Waste Management
Incinerated sewage sludge ash (ISSA) with high P2O5 content is a potential phosphorus resource that can replace the non-renewable phosphorus rocks. However, extracting phosphorus from ISSA using hydrometallurgical methods also dissolves a large amount of
Zhong-Hua Yang, Chuan-Ming Du, Rui-yuan Yuan, Hai-Xin Guo   +3 more
semanticscholar   +1 more source

Recovery of metals from waste printed circuit boards by selective leaching combined with cyclone electrowinning process.

Journal of Hazardous Materials, 2020
This paper provides a benign process that realized the metals separation and recovery from wPCBs in an efficient and low cost way. The chemical active order and potential-pH diagram of the metals enlightened us to apply stepwise leaching to selective ...
Xue-Yi Guo, Hong Qin, Q. Tian, Dong Li
semanticscholar   +1 more source

Direct selective leaching of chalcopyrite concentrate

Canadian Metallurgical Quarterly, 2014
AbstractThe ammonium persulphate (APS) leaching of chalcopyrite concentrate in the presence of ammonium carbonate was studied. The effects of ammonium carbonate concentration, APS concentration, leaching time, leaching temperature, solid/liquid ratio and stirring speed were investigated.
openaire   +1 more source

A Criterion for Selecting Leach Test Specimen Sizes

Nuclear Technology, 1982
When leaching is controlled by a diffusion process, leach test results are particularly simple to interpret when test specimens approximate semi-infinite media. For spherical and cylindrical leach test samples, a criterion relating the test duration T, the specimen radius R, and the effective bulk diffusion coefficient D, to the desired degree of ...
Claudio Pescatore, Albert J. Machiels
openaire   +1 more source

Decommissioning of a selected heap leach dump

International Journal of Surface Mining, Reclamation and Environment, 1996
ABSTRACT Cyanidation heap leaching is a prevalent low-cost method to extract gold from low-grade ores in the western United States. Relatively little is known about the geochemical processes which occur when a spent heap leach dump is rinsed to reduce the levels of potentially toxic constituents, however. Given that many heap leach dumps will be rinsed
openaire   +1 more source

Organic acid-mediated leaching kinetics study and selective extraction of Mo, V, and Ni from spent catalysts.

Waste Management
This article employs six organic acids to selectively dissolve Mo, Ni and V from spent catalysts, and the most effective acid is identified. Then, the effects of key leaching parameters, including acid concentration, temperature, and S/L ratio, on metal ...
Jing Gao, Wenchao Lu, Yujiang Li, Tao Wu
semanticscholar   +1 more source

Selective recycling of lithium from spent LiNixCoyMn1-x-yO2 cathode via constructing a synergistic leaching environment.

Journal of Environmental Management
The global response to lithium scarcity is overstretched, and it is imperative to explore a green process to sustainably and selectively recover lithium from spent lithium-ion battery (LIB) cathodes. This work investigates the distinct leaching behaviors
Jianzhi Zhang, Yuan Ding, Hui Shi, Peng-Hui Shao, Xinkai Yuan, Xingyu Hu, Qiming Zhang, Hong Zhang, D. Luo, Chaoqiang Wang, Li-Ming Yang, Xu-Biao Luo   +11 more
semanticscholar   +1 more source

Microwave-enhanced selective leaching of arsenic from copper smelting flue dusts.

Journal of Hazardous Materials, 2019
Alkaline sulphide leaching processes have been widely used for the arsenic selective removal from metallurgical wastes. However, high consumption of energy and chemicals as well as long extraction time have forced the industries to find more cost ...
Tian-Guo Li, Ji-Rong Lan, Ya-Guang Du, Tian C. Zhang, D. Du   +4 more
semanticscholar   +1 more source

Selective leaching of chromium-containing slag by HCl

Journal of Central South University of Technology, 2008
A batch of column experiments was carried out to investigate the change of Cr(Ⅵ) concentration leached out from chromium-containing slag with HCl as leaching agent, and to study influences of pH, ratio of solid mass to solution volume, flow velocity and temperature on Cr(Ⅵ) leaching. The optimal parameters were obtained for Cr(Ⅵ) leaching and a fitting
Zhi-hui Yang, Li-yuan Chai, Yun-yan Wang, Kun Zhao, Yu-de Shu   +4 more
openaire   +1 more source