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202221 · Introduction Heap leaching comprises stacking a coarsely crushed metal-bearing ore onto an impermeable pad and irrigating the ore for an extended period of time with a chemical leach solution to dissolve the target metal (s).
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2020121 · This paper aims to establish a mathematical model that can analyze the whole leaching kinetics process of ion-adsorption type rare earth ores. This leaching process is composed of three steps: (1) ammonium ions arrive at the ore particle surface through the diffusion layer; (2) ammonium ions exchange with rare earth ions; and (3) rare earth ...
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2022921 · Addition of a surfactant improved the permeability of ore columns. Surfactants improved the permeability coefficients for various areas of the ore column, especially for the bottom area, and the permeability coefficient was increased by 6%. After adding surfactant, the leaching rate of copper was increased by nearly 10%.
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202084 · general, the kinetics of leaching includes particle reaction. + transport phenomena and reactor-level reaction +. transport phenomena. This review is mainly focused on. kinetic models in the grain ...
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Column leaching experiments with ion adsorption-type rare earth ores for different lixiviant concentrations and different column heights were carried out. A mathematical model of column leaching was constructed based on the experimental data. Two parameters (a and b) in the model were determined according to the following methodology: the ore column …
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202221 · This review proposes a guideline for researchers investigating the leaching kinetics and mechanisms of REEs from secondary resources including low-grade minerals, industrial residues and end-of-life products. The utilization of the kinetics models for the leaching of REEs was deeply discussed in different categories of secondary resources.
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2020111 · Abstract The establishment of a mathematical model for the ion exchange process is key to creating a theoretical basis for the mining of ion-adsorption type rare earth ores. Ore samples from Xinfeng, Xunwu and Anyuan were used as the test ore samples in the present study and equilibrium batch tests of ore sample leaching using various …
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201331 · This paper presents recent laboratory column leaching studies undertaken to characterise and evaluate the sulphuric acid leaching behaviour of Ni laterite agglomerates. The work focussed on the effect of the initial particle size of the feed ore to the agglomeration stage on the leaching behaviour of the resulting agglomerates.
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The method described in this Test Guideline is based on soil column chromatography in disturbed soil. Two types of experiments are performed to determine (i) the leaching potential of the test substance, and (ii) the leaching potential of transformation products in soils under controlled laboratory conditions. At least duplicate leaching columns are …
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2021218 · The heap leach cyanidation carbon adsorption electrowinning process developed has proved to be an economical method for exploiting low-grade gold ores and small isolated deposits not suitable for treatment by conventional cyanidation procedures. Heap leaching may be the most profitable method for processing selected gold and silver …
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