Bioleaching: Introduction, Methods, Application, Copper, Microorganisms, and Processes! Introduction to Bioleaching: Leaching process was first observed in pumps and pipelines installed in mine pits containing acid water. This process was later on employed for recovering metals from ores containing low quantity of the metal. Presently …
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In situ leaching (ISL) is an attractive technique that enables copper recovery from copper oxide ores that are either low-grade or located at depths too great to be economically exploited through conventional methods. At present, in situ leaching (ISL) has been applied to intact copper oxide ores, in particular, those which (i) present a good …
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In copper dump leaching, run-of-mine ore is irrigated with acidic leaching solution to generate aqueous cupric ions for further processing. The very l…
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Key Terms. ore leaching: The process of recovering metals from ores by using a number of different techniques.; Microbial ore leaching (bioleaching) is the process of extracting metals from ores with the use of microorganisms. This method is used to recover many different precious metals like copper, lead, zinc, gold, silver, and nickel.
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For the leaching kinetics of copper, diffusion may play a more important role than surface reaction. (3) IL acids seem to show a selectivity for copper leaching from WPCBs, since under most conditions, copper leaching rate is up to around , while lead leaching rate is lower than 30%.
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In this study, the dissolution conditions and dissolution kinetics of copper from malachite in the presence of organic acid (C4H6O6) as an organic leaching reagent were examined. The effects of particle size, acid concentration, time, solid/liquid ratio, temperature, and mixing speed on the dissolution process of copper were investigated. …
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The leaching kinetics model can accurately describe the leaching process of copper by using four parameters: copper content, leaching time, leaching rate constant and recovery rate. The leaching kinetics of ammonia-ammonium chloride system and glycine-hydrogen peroxide system were analyzed by nonlinear fitting method. 2.
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In bioheap leaching process, the copper ore is piled up in large heap over an impermeable surface and an acidified solution containing some necessary bacterial growth nutrients like nitrogen (N ...
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The pressure leaching of copper concentrates continues to be attractive for rapid, complete oxidation of sulfide minerals with high copper extraction and arsenic …
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In this study, weak acid in the curing and leaching stages of copper ore was incorporated, and we analyzed its effect on the dissolution of copper and final impurities. The weak acid corresponds to a wastewater effluent from sulfuric acid plants produced in the gas treatment of copper smelting processes. This effluent is basically water with high acidity (pH-value …
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The kinetics of copper leaching in the H 2 SO 4 –H 2 O 2 system was also elucidated based on the experimental data and model fitting. This study provides a comprehensive understanding of the copper leaching process and would contribute to the recovery of other metals in WPCBs.
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Ore-containing copper oxides or secondary copper sulfides are easily treated by heap leaching or heap bioleaching technologies, respectively. The use of heap leaching for primary copper mineralization is now advancing rapidly with the goal of avoiding the costly grinding necessary to prepare these ores for flotation.
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Heap leaching (HL) is a process to extract low-grade minerals from ore, including copper, precious metals, nickel and uranium.
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In situ leaching offers a potentially attractive way to extract copper from the subsurface without costly fragmentation and processing. Applicability …
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Complex chalcopyrite-rich ore is crucial in global copper resources, but is highly refractory in conventional sulfate leaching system. In this paper, we explore the leaching of complex chalcopyrite-rich ores employing a mechanically activated pretreatment combined with wastewater with high concentrations of chloride.
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During the leaching process, bivalent cobalt is easily leached by sulfuric acid to form cobalt sulfate, while trivalent cobalt needs to be leached using a reductant. Because there is a high proportion of …
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Monitoring of the microbial community in bioleaching processes is essential in order to control process parameters and enhance the leaching efficiency.
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Leaching of copper from a Jordanian copper ore has been studied using a stirred batch reactor with hydrochloric acid as the main lixiviant, under the following conditions: temperature 25 – 45 oC ...
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The leaching operation comprises the introduction of a sulfuric acid solution containing varying amounts of ferrous and ferric sulfate onto the surface or into the interior of the dumps for the purpose of effecting the dissolution of copper minerals. The end product of the leaching operation …
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A new concept for copper (Cu) metal leaching by the simultaneous use of cupric ions (Cu2+) and oxygen (O2) was proposed to improve Cu metal leaching in sulfuric acid. According to this concept, Cu2+ oxidizes Cu metal into cuprous ion (Cu+), and O2 oxidizes Cu+ into Cu2+. The improvement in Cu leaching efficiency from Cu …
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Copper Agitated Leaching and cementation process of copper problem: The treatment of copper ores, both oxides and sulfides by means of flotation, hydrometallurgy or other processes has been well established for many years. Flotation has been applied generally to the treatment of sulfide ores, both in small and large scale …
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PDF | The theory and practice of copper and gold heap leaching | Find, read and cite all the research you need on ResearchGate
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This study presents an optimized leaching and electrowinning process for the recovery of copper from waste printed circuit boards including studies of chemical consumption and recirculation of leachate. Optimization of leaching was performed using response surface methodology in diluted sulfuric acid and hydrogen peroxide media. …
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Heap leaching is a firm extractive metallurgical technology facilitating the economical processing of different kinds of low-grade ores that are otherwise not exploited.
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Global Copper Industry by Process Type 2003 Production (Est.) Remaining Reserves (Est.) 11% 80% Mill, Smelt or Con Leach (cpy/cc) Leach, SX/EW (cc) Leach, SX/EW …
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A conceptual flowsheet is proposed, where chalcopyrite concentrate can be extracted by a leaching–grinding process and copper can be recovered by a solvent extraction–electrowinning circuit.
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Research on chalcopyrite leaching represents a great challenge, given its importance as one of the most abundant copper minerals and its significant role in global copper extraction. This study aimed to evaluate the effects of different parameters on chalcopyrite leaching by hydrogen peroxide as a strong oxidizing reagent in sulfuric …
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This paper outlines a comprehensive, cost-effective testing program for the acid-ferric sulfate heap leaching of oxide, supergene and primary copper ores. It is based on extensive experience in copper heap leaching and uses the many technological advances in the field developed over the past several decades. The approach described …
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The chemical and biological processes for chalcopyrite treatment are linked together by common elements of process design. The sulfate-based processes involve copper leaching, solid–liquid separation and residue washing, copper SX/EW and raffinate management.
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An overview of its industrial application and bibliometric analysis is conducted in Section 2.A systematic overview of mineral leaching models (expect for bioleaching processes) at the theoretical and empirical, laboratory and industrial scale is developed in Section 3, identifying the key factors that drive mineral leaching processes …
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