Selective copper dissolution during bioleaching of molybdenite concentrate. International Journal of Mineral Processing, 2006. M. Oliazadeh. R. Vaghar. Askari Zamani. Download PDF. Download Full PDF Package. This paper. A short summary of this paper. 37 Full PDFs related to this paper.
The book Modern Technology of Non-Ferrous Metals and Metal Extraction covers Non Ferrous metals and Materials, Processing of copper from Its ore, Lead and Zinc Recycling, Chromium Wastes and Their Recycling for the Reclamation of Chromium, Electrodeposition of cobalt from Cobalt chloride N-(N-Butyl) Pyridinium Chloride Molten Salt, Pyrohydrolysis, Processing of Low Grade Tungsten Ore ...
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 …
Molybdenite is the main mineral of molybdenum, and its extraction is divided into pyro process and hydro process according to oxidation methods. The later mainly includes nitric acid leaching [3,4], pressure acidic/ alkaline leaching [5,6], sodium hypochlorite/ dichromate leaching [7,8], and electrochemical leaching [9].
Chemical leaching tests support the idea of an indirect attack of the concentrate. Electrochemical tests indicate that chalcopyrite dissolution is favored when molybdenite is present. Therefore, this type of bioleaching treatment could be applied to purify molybdenite flotation concentrates by selectively dissolving chalcopyrite.
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 …
The purpose of this investigation was to study an alternative method of removing molybdenum from copper concentrate by sodium hypochlorite leaching. 2. Materials and methods. The copper concentrate (Cu 23.90%, Mo 3.40%, S 25.40%, P 0.04%, Fe 24.00%, As 0.10%, CaO 0.17%, SiO2, 4.35%, Sn 0.10%) used in this study was taken from the Dexing Copper ...
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.
12%Thus, in the present study, the pretreated (sulfidized) molybdenite concentrate becomes prone to easier leaching of the copper. In this regard, Padilla et al.[] have shown that molybdenite concentrates containing high contents of copper ranging from 3 to 8 pct can be purified by this method reducing the copper content to values as low as 0.2 pct in leaching with sulfuric acid …
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 ...
EPA/600/2-88/005 January 1988 COPPER DUMP LEACHING AND MANAGEMENT PRACTICES THAT MINIMIZE THE POTENTIAL FOR ENVIRONMENTAL RELEASES by Robert Hearn and Robert Hoye PEI Associates, Inc. 11499 Chester Road Cincinnati, Ohio 45246 EPA Contract No. 68-02-3995 Work Assignment Nos. 1/025 and 2/047 Project Officer S. Jackson Hubbard Manufacturing and Service …
US3196004A US269642A US26964263A US3196004A US 3196004 A US3196004 A US 3196004A US 269642 A US269642 A US 269642A US 26964263 A US26964263 A US 26964263A US 3196004 A US3196004 A US 3196004A Authority US United States Prior art keywords molybdenum solution precipitate copper leach solution Prior art date Legal status (The legal status is an …
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 McCabe-Thiele equilibrium isotherms were built by conventional procedures [15]. RESULTS AND DISCUSSION Leaching of molybdenite concentrate The residual leach solution used for solvent extraction of molybdenum and copper was obtained by dissolving 60 g of MOS2 concentrate in the acid mixture in the glass reactor.
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.
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.
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.
MOLYBDENITE CONCENTRATE ( LOW-GRADE ) 1 ACID MIX ----o LEACHING LEACH LIQUOR ( HCIHF) I (TO HF, Cu, NI RECOVERY ) UP-GRADED MoS2 1 HYDROGEN-- REDUCTION OFF-GAS LI M.E 1 REDUCED PRODUCT 1 __SEPARATION SLAG /METAL 1 IMPURE MOLYBDENUM 1 VACUUM MELTING 1 REFINED MOLYBDENUM Fig.8 Leach-reduction-melting …
Here we describe a cyanide leaching-carbon adsorption plant designed to recover the gold from the molybdenum concentrate. Process Design: The molybdenum concentrate assays typically, 45 percent molybdenum, less than 1 percent copper (chalcopyrite) and 3.5-5.0 percent iron (chalcopyrite-pyrite).Gold and silver average 8 and 40 ppm respectively which at an average molybdenum concentrate ...
Oxidation roasting of molybdenite concentrate Lu WANG, Guo-hua ZHANG, Jie DANG, Kuo-chih CHOU 38 Reductive acid leaching of cadmium fromzinc neutral leaching residue using hydrazine sulfate Chun ZHANG, Xiao-bo MIN, Jian-qiang ZHANG, Mi WANG, Bo-sheng ZHOU, Chen SHEN 39
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.
LEACHING OF MOLYBDENITE CONCENTRATE BY . 139 i founders day special issue indirect electro-oxidation process for leaching of molybdenite concentrate by hypochlorite: a modified approach. Inquire Now; Hypochlorite Leaching of Gold Ore Hydrochloric Acid ...
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 ...
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.
When the original molybdenite concentrate contains over 3% copper and only a small amount of insoluble matter, such as silica, we have found the residue will analyze about 20% copper. This material is admirably adapted for sale to a copper smelter as it is free of sulphur and has a high iron content which 30. is of value as flux.
Abstract A copper sulfation reaction from a molybdenite concentrate (42%Mo and 3.6%Cu) was conducted with sulfuric acid by microwave heating (190–240C) in a batch-type process at ambient pressure. A minimum energy consumption of about 0.9 (MWh/ton) was required to decrease the copper content of the molybdenite concentrate from 3.6% to less than 0.1% (>95% sulfation) in less than 15 …
Bulk (Copper-Moly) Thickener . A high-rate thickener dewaters the bulk of copper-moly concentrate before more separation. Moly Flotation . The moly flotation circuit has similar groups of flotation cells with chemicals to float the molybdenite (moly concentrate), and settle out the copper sulfides (copper concentrate). Copper Thickening ...
Molybdenite (a mineral form of molybdenum (IV) sulfide, MoS 2) is a byproduct of froth flotation of porphyry copper and is the main source of molybdenum (widely used in steel alloys) and its compounds [1]. The standard process for the production of molybdenum involves roasting of molybdenite concentrate in air and subsequent reduction of the
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 concentrates containing chalcopyrite by sulfidation of the molybdenite concentrate and subsequent ...
The technology of molybdenum extraction from molybdenite concentrate by using potassium chlorate (KClO3) or sodium chlorate (NaClO3) 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.