Results 261 to 270 of about 18,896 (300)

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.
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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
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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
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Effect of selected parameters on tetrahedrite leaching by ozone

Hydrometallurgy, 2005
Abstract Tetrahedrite, Cu 12 Sb 4 S 13 , can be an interesting and important resource of copper, antimony or other non-ferrous metals as is evident from its chemical formula. In spite of the high content of antimony in tetrahedrite, this mineral is not currently processed by pyrometallurgical methods mainly due to environmental concerns.
M. Ukasik, T. Havlik
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High-efficiency leaching process for selective leaching of lithium from spent lithium iron phosphate

Waste Management
With the arrival of the scrapping wave of lithium iron phosphate (LiFePO4) batteries, a green and effective solution for recycling these waste batteries is urgently required. Reasonable recycling of spent LiFePO4 (SLFP) batteries is critical for resource recovery and environmental preservation.
Guidong, Li, Ye, Chen, Mingkun, Wu, Yuzhi, Xu, Xiang, Li, Mengkui, Tian   +5 more
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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
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Selection criteria of xenobiotic leaching models in soil

European Journal of Agronomy, 1995
Selection criteria of xenobiotic dissipation models in soil are discussed. Model potentialities and user requirements are diverse ; it is paramount to evaluate each model in view of its application. Three main topics are evaluated : user/programme interactions, model purposes, and real world/model relationships. 1) A programme (or a paper-written model)
A.A.M. Del Re, M. Trevisan
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Selective bacterial leaching of a lead sulphide concentrate

International Journal of Mineral Processing, 1974
Abstract Leaching with Thiobacillus ferrooxidans has been used for selectively extracting Cu, Zn and Cd values from a PbS concentrate. The PbS is partly oxidized to the sulphate form. A scheme has been proposed for the recovery of the metal values from the leach liquor.
A.E. Torma, K.N. Subramanian
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Selective leaching or selective corrosion

2023
Chaudhery Mustansar Hussain, Chandrabhan Verma, Jeenat Aslam, Ruby Aslam, Saman Zehra   +4 more
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Selective uranium oxidation during in situ leaching

Mining, Metallurgy & Exploration, 1992
O2, NaClO3, H2O2, NaOCl and Ce+4 have been examined as oxidants in an alkaline carbonate system for uranium in situ leaching. The South Texas and New Mexico ores contained up to 2.6 meq/g of reducing compounds that consume oxidants in the leaching operation. Leaching rates did not increase linearly with the oxidation potential of the oxidants.
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