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Mesophilic and thermophilic bioleaching of copper from a

Apr 10, 2014 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.

Processing of Copper-Containing Molybdenite Concentrates

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 process products was studied.

Kinetics of copper dissolution in the purification of

May 01, 2013 The leaching of the sulfidized molybdenite concentrate in sulfate–chloride–oxygen media for 90 min at 100 °C dissolved 96% of the copper which yielded a final concentrate with less than 0.2% Cu. Under these leaching conditions, the molybdenum dissolution was negligible and iron dissolution was lower than 20%.

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

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.

method for leaching of copper and molybdenum

method for leaching of copper and molybdenum. 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 h so and m na cr o solution for min at c under these conditions about of the copper was dissolved with little dissolution of molybdenum get price

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.

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.

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

Roasting of Molybdenite Concentrates in Pilot Scale Rotary

molybdenum trioxide. A roasted concentrate contains approximately 80-90% MoO 3, 3-8% FeO, 3-10% SiO 2, 0.4-2% CuO, 0.05-0.15% S. If the sulphur amount is higher than 0.15%, the concentrate is reroasted. Oxidation roasting of molybdenite concentrates have been studied for many years and it is believed that the roasting

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.

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.

(PDF) Selective copper dissolution during bioleaching of

Selective copper dissolution during bioleaching of molybdenite concentrate

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

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.

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

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

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.

Mechanism and leaching kinetics of molybdenite

molybdenite concentrate leaching, demonstrating the scarcity of information on this subject. 1.1. State of the art . Several studies on molybdenite concentrate leaching have appeared in the literature. et al. (2009) Cao leached molybdenum from molybdenite concentrate (41.40% Mo, 31.40% S, 2.20% Cu) using a NaClO. 3-

Roasting of Molybdenite Concentrates in Pilot Scale Rotary

molybdenum trioxide. A roasted concentrate contains approximately 80-90% MoO 3, 3-8% FeO, 3-10% SiO 2, 0.4-2% CuO, 0.05-0.15% S. If the sulphur amount is higher than 0.15%, the concentrate is reroasted. Oxidation roasting of molybdenite concentrates have been studied for many years and it is believed that the roasting

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

Process for recovering molybdenum and copper from sulfide

One method of removing the copper from the molybdenum sulfide concentrate is to leach it with an aqueous solution of ferric chloride and the molybdenite remaining then roasted to MoO 3. A by-product of roasting is SO 2 which, depending on its concentration in the flue gas, is

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.

Bioleaching of a Copper Sulphide Concentrate by Two

Jan 06, 2012 : Bioleaching of a Copper Sulphide Concentrate by Two Different Strains of . Acidophilic. Bacteria . pyrite –FeS. 2, pyrrhotite –FeS. X, violarite–(FeNi) 3. S. 4, millerite- NiS and molybdenite-MoS. 2. as the minor phases. Petrology of copper concentrate (Figure 1(a)) also indicates that chalcopyrite and pentlandite are the major phases

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

(PDF) Selective copper dissolution during bioleaching of

Selective copper dissolution during bioleaching of molybdenite concentrate

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

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

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.

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.

Mechanism and leaching kinetics of molybdenite

molybdenite concentrate leaching, demonstrating the scarcity of information on this subject. 1.1. State of the art . Several studies on molybdenite concentrate leaching have appeared in the literature. et al. (2009) Cao leached molybdenum from molybdenite concentrate (41.40% Mo, 31.40% S, 2.20% Cu) using a NaClO. 3-

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.

Bioleaching of a Copper Sulphide Concentrate by Two

Jan 06, 2012 : Bioleaching of a Copper Sulphide Concentrate by Two Different Strains of . Acidophilic. Bacteria . pyrite –FeS. 2, pyrrhotite –FeS. X, violarite–(FeNi) 3. S. 4, millerite- NiS and molybdenite-MoS. 2. as the minor phases. Petrology of copper concentrate (Figure 1(a)) also indicates that chalcopyrite and pentlandite are the major phases

Roasting of Molybdenite Concentrates in Pilot Scale Rotary

molybdenum trioxide. A roasted concentrate contains approximately 80-90% MoO 3, 3-8% FeO, 3-10% SiO 2, 0.4-2% CuO, 0.05-0.15% S. If the sulphur amount is higher than 0.15%, the concentrate is reroasted. Oxidation roasting of molybdenite concentrates have been studied for many years and it is believed that the roasting

Roasted Molybdenite Concentrate Climax Molybdenum

Molybdenum Concentrate containing packages should always be covered with scrap or liquid metal. If added to the bath, the product should be introduced under the slag level. If used in the electric arc furnace direct contact with the electrodes should be avoided. SPECIFICATIONS Element Analysis Molybdenum 57.00 % min. Copper 0.50 % max.

Acidic Leaching with Chlorate as Oxidizing Agent to

The technology of molybdenum extraction from molybdenite concentrate by using potassium chlorate (KClO 3) or sodium chlorate (NaClO 3) has been investigated.The results show that leaching time, leaching temperature, agitation speed, oxidizer type, potassium or sodium chlorate, and hydrochloric acid concentration have significant effect on the molybdenum extraction efficiency.

Investigation of Leaching Kinetics of Copper from

The selective leaching and separation of molybdenum from complex molybdenite concentrate containing copper. Li-feng Li; Zhan-fang Cao; Hong Zhong; Ming-ming Wang; Guang-yi Liu; Shuai Wang; and Xiao-yu Ca // Minerals & Metallurgical Processing;Nov2013, Vol. 30 Issue 4, p233

Leaching and Kinetic Modelling of Molybdenite

ABSTRACT: Leaching of molybdenite concentrate with hydrogen peroxide in sulfuric acid solution was investigated to determine the effects of reaction time, reaction temperature, H 2O 2 concentration, H 2SO 4 concentration, pulp density and rotation speed on molybdenum extraction and molybdenite dissolution kinetics, using the Taguchi method.