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.
Table of ContentsProcess ChemistryGeneral Flow SheetSolution Regeneration The Anaconda Minerals Company operates a molybdenite and copper producing mine and mill facility near Tonopah, Nevada. Included with the milling facility is a ferric chloride leach plant for removal of copper mineralization from the molybdenite concentrates. Discussed are
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
Because detailed information on the effect of as mentioned leaching parameters on the kinetics of the pressure leaching of the molybdenite concentrate are still not available, the present research was conducted to study such effects on kinetics of the pressure oxidative leaching of the molybdenite concentrates in nitric acid. 2.
Copper removal from molybdenite concentrate by sodium dichromate leaching. 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, Arrhenius plot for the dissolution of copper from molybdenite concentrate with H 2 SO 4 –Na 2 Cr 2 O 7. 4.
Copper leaching at 45 °C by the moderately thermophilic consortium was tested in matrix of pulp density (3, 6, and 9%) and silver addition The amount of copper dissolved from the molybdenite concentrate was substantially improved by the addition of silver as AgNO 3.
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.
Copper content of the concentrate was 0.83 wt.% as chalcopyrite. The tests showed selective dissolution of copper (chalcopyrite) from molybdenite concentrate. Up to 65% of copper content of molybdenite concentrate was removed via bioleaching with a
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.
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.
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...
For uses of molybdenite in the steelmaking process, the content of 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
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
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
copper leaching plant for sale tcfuwhr . The greatest concern associated with high plant molybdenum levels is with crops used for grazing or silage production. Ruminant animals, which consume plant tissues high in molybdenum content, can suffer from molybdenosis, a disorder that induces copper
Abstract The present research reports on the selective dissolution of copper and iron from a Chilean molybdenite concentrate using mesophilic, moderate and extreme thermophilic culture bacteria. Fr...
Method for leaching of copper and molybdenum MetaLeach,Apr 21, 2015· 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%. Live Chat; What is Status of Molybdenum Recovery and Utilization ,
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. The activation energy of the leaching reaction was found to be approximately 9.21 kJ/mol.
Generally, molybdenite, which is frequently associated to copper sulfides, is a by-product in copper mining. At present, molybdenite flotation concentrates are obtained. The presence of chalcopyrite in a molybdenite concentrate drastically reduces its market value due to terms imposed by buyers.
leaching molybdenite fro coppe sulfidemr ansd positive results wer e obtained whe applyinn g this propert to thye extraction of molybdenite from coppe rougher r concentrates. The formatio of oxiden s during dryin and/og leachinr ogf copper sulfide wass foun td
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Selective copper–iron dissolution from a molybdenite concentrate using bacterial leaching. as catalyst. Optimal copper–iron dissolution is obtained using extreme thermophilic microorganisms and low pulp density (2% w/v). Total selective dissolution of chalcopyrite is achieved which leads to a pure molybdenite concentrate being
US4231859A Molybdenite flotation Google Patents 1 A process for recovering molybdenite from copper sulfide flotation concentrates containing minor amounts of iron sulfide comprising (1) preparing an aqueous pulp comprising the concentrate and about 02 to 1 pound of activated carbon per ton of concentrate, (2) injecting steam into the pulp in .
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. Box 11155-9466, Iran article info abstract Article history:
5-2-2014· Molybdenite concentrates produced from porphyry copper deposits contain copper as an impurity in variable quantities. 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