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2021728 · For instance, Liu et al. found that the leaching kinetics of a low-grade complex copper ore in ammonia-ammonium chloride solution followed the diffusion process with the activation energy of 23.279 kJ/mol. Seo et al. reported that the leaching kinetics of a Cu-Co ore in the sulfuric acid and hydrogen peroxide system followed the shrinking core ...
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200091 · Keywords Hydrometallurgy; leaching; reaction kinetics INTRODUCTION Thiosulfate as an alternative lixiviant for gold has received much attention in recent years due to the growing environmental and public concerns over the use of cyanide. Acceptable gold leaching rates using thiosulfate are achieved in the presence of ammonia with …
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201931 · Request PDF | Accelerating leaching of copper ore with surfactant and the analysis of reaction kinetics | To solve the problem of low permeability and lower extraction rates of high-mud ores, a ...
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20221116 · Coppermaking from sulfide concentrates entails two major steps: smelting and converting. In continuous direct-to-copper smelting process these two steps are combined into one. The principal advantages of this process are: isolation of SO2 emission to a single, continuous, SO2-rich gas stream, minimization of energy consumption and …
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202222 · The study of copper (Cu) recovery is crucial for the entire recovery process of waste printed circuit boards (WPCBs), and Cu can be leached efficiently via a sulfuric acid–hydrogen peroxide (H 2 SO 4 –H 2 O 2) system.To achieve high Cu recovery, it is important to evaluate the parameters of the leaching process and understand the Cu …
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The leaching kinetics of a low-grade zinc oxide ore in different acid media was investigated with respect to the experimental variables including acid concentration, temperature, liquid to solid (L/S) ratio, and stirring speed. The results obtained showed that the leaching reagent concentration and the reaction temperature exerted significant effects on the extraction of …
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201681 · The fitted kinetics model parameters and regression performance are given in Table 5, with the fine and coarse grind kinetics curves given in Fig. 16, ... For the porphyry copper ore tested in these investigations, a coarse copper sulphide grain size coupled with a high association with hard microwave-transparent ...
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2018516 · This study investigated the kinetics of copper leaching from malachite ore using formic acid as an. organic leaching reagent. The analysis was carried out to determine the effect of the following ...
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20231127 · The leaching mechanism was further investigated using the leaching kinetic model. Kinetic analysis. The leaching process of Mn and Fe from pyrolusite and CS in a sulfuric acid medium can be described as a solid–liquid reaction system. Under acidic conditions, the entire leaching process is carried out according to Eqs. ~ (10).
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2018723 · The kinetics analysis of ore column leaching illustrated that the leaching processes were controlled by both internal diffusion (principal factor) and chemical reaction. ... and Chao Liu, Accelerating leaching of copper ore with surfactant and the analysis of reaction kinetics, Int. J. Miner. Metall. Mater., 26(2019), No. 3, pp. 274-281. https ...
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