GCM Mechanical

molybdenite concentrate copper leaching

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  • Selective copperiron dissolution from a molybdenite

    Selective copperiron dissolution from a molybdenite concentrate using bacterial leaching Patricia Romano Department of Materials Science and Metallurgical Engineering, Facultad de Ciencias Químicas, Universidad Complutense de Madrid, 28040 Madrid, Spain

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  • Molybdenum Processing IMOA

    Flotation separates the metallic minerals from the gangue this way andin the case of copper/ molybdenum oresseparates molybdenite from copper sulphide. The resulting MoS 2 concentrate contains between 85% and 92% MoS 2. Further treatment by acid leaching can be used to dissolve impurities like copper and lead if necessary.

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  • Kinetics of Copper Removal from Sulfidized Molybdenite

    To produce a high-grade molybdenite concentrate, a chemical purification method is normally practiced. In this paper, a new alternative for the copper elimination from molybdenite concentrates containing chalcopyrite by sulfidation of the molybdenite concentrate and subsequent pressure leaching in sulfuric acid-oxygen media is discussed.

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  • Leaching molybdenum from a low-grade roasted molybdenite

    Abdollahi H, Noaparast M, Shafaei SZ, Manafi Z, Erust C, Akcil A (2021) Acidic leaching with chlorate as oxidizing agent to extract Mo and Re from molybdenite flotation concentrate in a copper plant. Sep Sci Technol 5023962404 Google Scholar

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  • Kinetics of Copper Removal from Sulfidized Molybdenite

    The leaching of the sulfidized molybdenite concentrate for 90 min at 100 °C dissolved 96% of the copper which yielded a final concentrate with less than 0.2% Cu.

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  • US4500496A Process for purifying molybdenite

    An improved process is disclosed for the treatment of molybdenite concentrate to remove impurities, such as copper and lead therefrom. According to this process, ferrous chloride liquor is introduced into a reactor which is made of a material that can withstand leaching with the use of ferric chloride at elevated temperatures and pressures.

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    Mixed Moderate Thermophilic Bioleaching of Cu, Mo and Re

    2.1. Molybdenite concentrate and characterization studies A representative sample of molybdenite concentrate from the Sarcheshmeh Copper Complex of Iran with a size distribution of 90 wt. % less than 38 μm was used for bioleaching tests. The d 80 of the sample was determined to be 33 μm using cyclosizer equipment. Molybdenite

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  • US9011574B2 Method for leaching of copper and molybdenum

    A method for leaching copper and molybdenum from an ore, residue and/or concentrate containing such, in which more than 1% w/w of the total molybdenum is present as a sulfide and in which more than 1% w/w of the total copper is present as an oxide, the method comprising the steps of exposing the ore, residue and/or concentrate to an aqueous solution of chlorine (I)-based oxidizing species of

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  • Mesophilic and thermophilic bioleaching of copper from a

    Apr 10, 2021 · On a mass basis, molybdenum dissolution exceeded copper leaching but the relative yields were < 9%. If the molybdenite concentrate is upgraded by removing Cu through bioleaching, molybdenum loss into solution may be offset by recovering it from leach solutions.

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  • Molybdenum Removal From Copper Ore Concentrate by Sodium

    Alkaline leaching of copper concentrate bearing molybdenite was investigated. Thermodynamic analysis of Mo-S-H2O and Cu-Fe-S-H2O indicates that alkaline leaching of copper concentrate

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  • Selective copper dissolution during bioleaching of

    The leaching of the sulfidized molybdenite concentrate for 90 min at 100 °C dissolved 96% of the copper which yielded a final concentrate with less than 0.2% Cu.

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  • Removal of Copper from a Molybdenite Concentrate by

    About 94% of copper was removed at 80°C after 120 h of leaching with a residual copper content of 0.46% which meets the commercial requirements for molybdenite concentrates.

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    LEACHING OF MOLYBDENITE CONCENTRATE BY

    LEACHING OF MOLYBDENITE CONCENTRATE BY HYPOCHLORITE A MODIFIED APPROACH Introduction Low grade molybdenite concentrates recovered from porphyry copper ores, contain copper suphides in various amounts. Selective dissolution of molybdenum values has been achieved by sodium hypochlorite generated externally or electrolytically generated in situ

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  • Purification of molybdenite concentrates

    Copper is present in the concentrate mainly as copper sulphide, chalcopyrite. Investigations were carried out on the removal of the sulphide by their selective leaching in sodium cyanide, ferric chloride and ferric sulphate solutions.

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    2021012 MASTER'S THESIS DiVA portal

    minimum dissolution of molybdenum in the concentrate. Copper is present in the concentrate mainly as copper sulphide, chalcopyrite. Investigations were carried out on the removal of the sulphide by their selective leaching in sodium cyanide, ferric chloride and ferric sulphate solutions.

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    Acid Pressure Leach Process for Copper Removal

    sodium dichromate for copper leaching from a molybdenite concentrate containing 41.1 % molybdenum and 3.65 % copper in the form of chalcopyrite and covellite (CuS). About 95 % of copper was leached with little dissolution of molybdenum by sulfuric acid solution in the presence of Na2Cr2O7 for 90 min at 100 °C and a solid to liquid ratio of 1

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  • Molybdenum mining and processing-Metalpedia

    The resulting MoS2 concentrate usually contains 85%~92% MoS2 and small amounts of copper (less than 0.5 percent) if the molybdenum is recovered as a by-product of copper. Further treatment by acid leaching can be used to dissolve impurities like copper and lead if necessary.

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  • Acid Pressure Leach Process for Copper Removal

    The conditions for the selective oxidation of copper and iron sulfide minerals contained in a low-grade molybdenite concentrate during autoclave leaching in acidic media have been studied. The effect of oxygen partial pressure, reaction time and temperature on copper removal has been examined.

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  • () Selective copper-iron dissolution from a molybdenite

    Selective copper-iron dissolution from a molybdenite concentrate using bacterial leaching July 2021 Journal of Chemical Technology & Biotechnology 76(7)723-728

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  • US3674424A Process for purifying molybdenite

    impurities are removed from molybdenite concentrates by leaching the concentrates at a temperature of at least 70* c. with an aqueous solution containing at least one alkali metal or alkaline earth metal chloride and at least one oxidising chloride selected from cupric and ferric chlorides.

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  • Copper removal from molybdenite concentrate by sodium

    May 01, 1998 · The effect of stirring speed was studied by leaching the molybdenite concentrate with a solution 0.1 M Na 2 Cr 2 O 7 and 0.3 M H 2 SO 4, at 80°C for 60 min in the range 280 to 560 rpm. The results indicated that the dissolution of the concentrate was independent of the stirring speed, suggesting that the diffusion of reactants from the

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  • Copper Removal from Molybdenite by Sulfidation-Leaching

    The process involves a sulfidation of the molybdenum concentrate with 82(g) at 380 °C followed by a leaching stage. H 2 SO 4-NaCl-O 2 leaching of a sulfidized concentrate containing 3.4% Cu for 90 min at 100°C produced a molybdenite concentrate with less than 0.2% Cu, which is appropriate for marketing. Molybdenite dissolution was negligible

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  • Molybdenum removal from copper ore concentrate by sodium

    Jan 01, 2021 · Furthermore, in most cases, it is necessary to use a final step, namely chemical purification of the molybdenite concentrate, to reduce the copper content to a level suitable for marketing. Common methods of chemical purification in industrial practice include the cyanide leaching, ferric chloride leaching, and hydrochloric acid leaching

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  • US3539002A Process for separating molybdenite from

    US3539002A US3539002DA US3539002A US 3539002 A US3539002 A US 3539002A US 3539002D A US3539002D A US 3539002DA US 3539002 A US3539002 A US 3539002A Authority US United States Prior art keywords percent pulp molybdenite flotation concentrate Prior art date 1967-12-11 Legal status (The legal status is an assumption and is not a legal conclusion.

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  • Kinetics of copper dissolution in the purification of

    The leaching of the sulfidized molybdenite concentrate for 90 min at 100 °C dissolved 96% of the copper which yielded a final concentrate with less than 0.2% Cu.

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  • The selective leaching and separation of molybdenum from

    The grade of copper in the residue was 21.84%, with a recovery 99.93%. The technology of selective electro-oxidation leaching of molybdenum and recovery of copper from complex molybdenite concentrate is an effective separation method. The diffusion control model can be used to describe the process of leaching of molybdenum.

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  • () Kinetics of leaching of copper concentrates by

    The purification of molybdenite concentrates by this method is feasible, and the best results were obtained by leaching the concentrate with the stoichiometric concentration of H2SO4 and 0.12 M

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  • Molybdenite concentrate cleaning by copper sulfation

    Nov 01, 2021 · CONCLUSIONS It was found that concentrated sulfuric acid leaching (190-240 C) activated by microwaves, in a batch-type ambient pressure process, decreased the copper content of the molybdenite concentrate from 3.6% to less Molybdcnite conccntrate cleaning by copper sulfation activated by microwave 1419 than 0.1 h (>95% sulfation) in less than

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  • Selective copperiron dissolution from a molybdenite

    Jun 19, 2021 · Selective copperiron dissolution from a molybdenite concentrate using bacterial leaching Patricia Romano Department of Materials Science and Metallurgical Engineering, Facultad de Ciencias Químicas, Universidad Complutense de Madrid, 28040 Madrid, Spain

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  • Processing of Copper-Containing Molybdenite Concentrates

    Jan 26, 2021 · The paper discusses methods of processing copper-containing molybdenite concentrates. A process flow diagram based on roasting with sodium chloride (or carbonate) and subsequent water leaching is presented. The chemistry of sulfide interaction with salt additives is described. The effect of the roasting temperature on copper and molybdenum distribution among the

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