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Remove Copper from Moly by Ferric Chloride Leaching

Oct 15, 2018  The leach plant was designed to process 2.2 t/h (2.42 STPH) of molybdenite concentrates averaging less than 1.5 percent copper. Startup in late August 1982 was at 1.0 t/h (1.1 STPH) and was gradually increased to 1.5 t/h (1.65 STPH) in November 1982.

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Molybdenite concentrate cleaning by copper sulfation ...

Nov 01, 2001  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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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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Removal of Copper from a Molybdenite Concentrate by ...

copper typically needs to be 0.5% or less.1,2 In this study, the refining of molybdenite by leaching of copper in chloride solution was investigated on a molybdenite-bearing flotation concentrate containing 6.1% copper as chalcopyrite. The study sought to reduce the copper concentration to a commercially acceptable minimum of 0.5% or less with ...

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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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Silver-catalyzed bioleaching of copper, molybdenum and ...

Oct 01, 2015  The effect of silver on the mesophilic bioleaching of the molybdenite concentrate was tested in the range of 0–1000 mg Ag l −1, added as AgNO 3.Selective results are shown in Fig. 1 as examples of changes over time in pH, redox potential, cell counts and the leaching of Cu, Mo, and Re with 0, 120, and 1000 mg l −1 Ag addition.. Download : Download full-size image

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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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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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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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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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Removal of Copper from a Molybdenite Concentrate by ...

copper typically needs to be 0.5% or less.1,2 In this study, the refining of molybdenite by leaching of copper in chloride solution was investigated on a molybdenite-bearing flotation concentrate containing 6.1% copper as chalcopyrite. The study sought to reduce the copper concentration to a commercially acceptable minimum of 0.5% or less with ...

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Selective copper–iron dissolution from a molybdenite ...

Jun 19, 2001  Selective copper–iron 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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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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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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(PDF) 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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Molybdenum Processing - IMOA

Flotation separates the metallic minerals from the gangue this way and – in the case of copper/ molybdenum ores – separates 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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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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US3911076A - Process for purifying molybdenite ...

A process for selectively removing oxidized metal impurities of one or more of the metals cobalt, zinc, nickel, and copper from a molybdenite concentrate comprises suspending the molybdenite concentrate in an aqueous solution containing at least about 10 grams per liter of ammonia and at least about 4 grams per liter of an ammonium salt and maintaining the suspension at a temperature of from ...

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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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(PDF) Selective copper-iron dissolution from a molybdenite ...

Selective copper-iron dissolution from a molybdenite concentrate using bacterial leaching July 2001 Journal of Chemical Technology Biotechnology 76(7):723-728

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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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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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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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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

More

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

More

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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A study of the treatment of some Arizona molybdenite ores

copper toy leaching methods from tho calcine produced by roasting molybdenite concentrate* Very little material in available in tho literature concerning the treatment of molybdenite oron along tho linos described* - Considerable unpublished experimental work along tho lines described hac been done by members of tho Department of

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US3911076A - Process for purifying molybdenite ...

A process for selectively removing oxidized metal impurities of one or more of the metals cobalt, zinc, nickel, and copper from a molybdenite concentrate comprises suspending the molybdenite concentrate in an aqueous solution containing at least about 10 grams per liter of ammonia and at least about 4 grams per liter of an ammonium salt and maintaining the suspension at a temperature of from ...

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Autoclave leaching of molybdenite concentrates with ...

Nov 23, 2010  The scientific theoretical prerequisites for the use of small additives of nitric acid for the intensification of the autoclave oxidative leaching (AOL) of sulfide concentrates are checked in order to increase the degree of extraction of the base metal with a simultaneous decrease in the cost of the process. The technological parameters of the AOL conditions applied to molybdenite are also ...

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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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Removal of Metallic Impurities from Off-Grade Copper ...

The removal of metallic impurities from off-grade copper concentrate was investigated in alkaline solution with H2O2. The analysis results of XRD and SEM-EDS revealed the oxidative mechanisms of all sulfides. The influence of various parameters of alkaline leaching were investigated including concentrations of sodium hydroxide and hydrogen peroxide, liquid to solid ratio, leaching time and ...

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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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(PDF) Selective copper-iron dissolution from a molybdenite ...

Selective copper-iron dissolution from a molybdenite concentrate using bacterial leaching July 2001 Journal of Chemical Technology Biotechnology 76(7):723-728

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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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US4083921A - Purifying molybdenum flotation concentrates ...

Copper, iron, and lead impurities are removed from molybdenum flotation concentrates by mixing the feed concentrates with a nonvolatile chloride salt, heating the mixture to a temperature of from about 200° to 350° C for a time sufficient to activate the lead impurities in the concentrates so that they can be leached therefrom during the subsequent leach step, and leaching copper, iron, and ...

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