Molybdenite Concentrate Copper Leaching

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

Copper bioleaching was tested with a CuFeS 2-bearing molybdenite concentrate.. Silver increased the yields of bioleaching of copper with mesophilic bacteria (32 °C). • The relative dissolution was <1% for Mo and <6% for Re and not enhanced by Ag.

Molybdenite concentrate cleaning by copper sulfation ...

Molybdenite concentrate cleaning by copper sulfation activated by microwave I-tl7 Experimental data of copper sulfation kinetics assisted by microwaves. i.e. as presented in Figure 4, showed that a first order kinetic describes reasonably well the copper leaching of the tnolybdenite concentrate, after the initial period of pulp heating and activation, dCu = kCu (5) dt where, Cu : residual ...

LEACHING OF MOLYBDENITE CONCENTRATE BY HYPOCHLORITE: …

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

Kinetics of pressure oxidative leaching of molybdenite ...

Highlights The effect of parameters on pressure leaching of molybdenite concentrate was studied. Complete leaching of the molybdenite concentrates was achieved in less than one hour. Mechanism of the leaching reaction was determined. The amount of the reaction activation energy was calculated. The leaching precipitates were characterized by SEM and X-ray.

Nitric acid leaching of molybdenite concentrates ...

Nitric acid leaching of molybdenite concentrates. Hydro- metallurgy, 6: 103--119. Molybdenite (MoS2) has been found to leach slowly in dilute (1--4 M) nitric acid at room temperature, to yield solutions of molybdic acid (H2MoO4) :,nd sulphuric acid.

Kinetics of copper dissolution in the purification of ...

Sulfidation leaching is effective for copper removal from molybdenite concentrates. • Chalcopyrite copper in molybdenite concentrate was lowered to less than 0.2 percent. • Copper dissolution from molybdenite concentrates follows the shrinking core kinetics.

Remove Copper from Moly by Ferric Chloride Leaching

The concentrate leaching system consists of the unleached concentrate day bin, concentrate repulp circuit, and the agitated leach tank circuit. Here molybdenum concentrates are slurried with hot ferric chloride leach solution to dissolve the copper and lead contaminants present.

Molybdenum Processing - IMOA: International …

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.

Copper Removal from Molybdenite by Sulfidation-Leaching ...

Abstract. Molybdenite (MoS 2) concentrates are produced by differential flotation from bulk copper-molybdenum concentrates.However, complete separation of molybdenum by flotation is very difficult, thus, molybdenum concentrates produced by this route requires a further step of chemical purification in order to reduce the copper content to a suitable level for marketing.

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 ...

Copper Removal from Molybdenite by Sulfidation …

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.

Leaching molybdenum from a low-grade roasted …

A technique for leaching molybdenum from low-grade roasted molybdenite concentrate was proposed by the aqueous solution containing sodium chlorate and sodium carbonate. The effect of molar ratio of sodium chlorate to molybdenum, leaching time, liquid–solid ratio, leaching temperature, sodium carbonate concentration and agitating speed on leaching rate of molybdenum was studied.

(PDF) Selective copper-iron dissolution from a …

Selective copper-iron dissolution from a molybdenite concentrate using bacterial leaching Article (PDF Available) in Journal of Chemical Technology & Biotechnology 76(7):723-728 · July 2001 with ...

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.

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 ...

Autoclave leaching of molybdenite concentrates with ...

Autoclave leaching of molybdenite concentrates with catalytic additives of nitric acid Article in Russian Metallurgy (Metally) 2010(7):588-595 · July 2010 with 42 Reads How we measure 'reads'

Comparative study on the selective chalcopyrite ...

Molybdenite (MoS2) is the main source of molybdenum. Generally, molybdenite, which is frequently associated to copper sul¢des, is a by-product in copper mining. At present, molybdenite £otation concentrates are obtained. The presence of chalcopyrite in a molybdenite concentrate drastically reduces its market value due to terms imposed by buyers.

Selective copper–iron dissolution from a molybdenite ...

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

Aqueous Oxidation of Molybdenite in Chalcopyrite …

To find out whether molybdenite can be leached out of chalcopyrite concentrates containing 14% molybdenite, leaching experiments were conducted on 50 grams of chalcopyrite concentrate. The purpose of these tests were to find out how much oxygen and hydroxyl ions were consumed during leaching of the molybdenite assumed to be in the concentrate.

The selective leaching and separation of molybdenum …

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.

Acidic Leaching with Chlorate as Oxidising Agent to ...

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.

WO2006082484A2 - Reduction of copper content in the ...

Methods and systems for removing copper minerals from a molybdenite concentrate. One embodiment provides leaching copper from the molybdenite concentrate with a leaching solution comprising ferric chloride, removing molybdenite from the leaching solution, introducing an acid into the leaching solution and introducing O2, O3, or a combination of both, into the leaching solution.

US7794677B2 - Reduction of copper content in the ...

Methods and systems for removing copper minerals from a molybdenite concentrate. One embodiment provides leaching copper from the molybdenite concentrate with a leaching solution comprising ferric chloride, removing molybdenite from the leaching solution, introducing an acid into the leaching solution and introducing O 2 , O 3 , or a combination of both, into the leaching solution.

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.

UP-GRADATION OF MoO3 COPPER, IRON, ZINC FROM ROASTED ...

Up-Gradation of MoO3 and Separation of Copper, Iron, Zinc from Roasted Molybdenum Ore by a Leaching Process 393 Brazilian Journal of Chemical Engineering Vol. 30, No. 02, pp. 391 - 397, April - June, 2013 oxide with improved content was obtained by a

Kinetics of pressure oxidative leaching of molybdenite ...

Kinetics of pressure oxidative leaching of molybdenite concentrate by nitric acid Amin Khoshnevisan, Hosein Yoozbashizadeh, Mahdi Mozammel!, Seyed Khatiboleslam Sadrnezhaad Department of Materials Science and Engineering, Sharif University of Technology, Azadi Ave., Tehran, P.O. …

US9011574B2 - Method for leaching of copper and …

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 ...

US20100098605A1 - Reduction Of Copper Content In The ...

Methods and systems for removing copper minerals from a molybdenite concentrate. One embodiment provides leaching copper from the molybdenite concentrate with a leaching solution comprising ferric chloride, removing molybdenite from the leaching solution, introducing an acid into the leaching solution and introducing O 2 , O 3 , or a combination of both, into the leaching solution.

Comparative study on the selective chalcopyrite ...

This study evaluates different bioleaching treatments of a molybdenite concentrate using mesophilic and thermophilic bacterial cultures. Further studies on the chemical leaching and the electrochemical behavior of the MoS 2 concentrate were carried out.

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