— Molybdenite flotation concentrate was leached with sodium dichromate–sulfuric acid solutions in order to remove the copper sulfide impurities. The experimental results indicated that the temperature has a large influence on the copper dissolution. The concentration of dichromate has also a pronounced effect for …
— 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 …
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 ...
— Section snippets Materials. Bismuth sulfide concentrate, the raw material, was produced by the flotation process in Chenzhou, Hunan, China. Prior to starting the leaching experiments, the bulk concentrate was milled, crushed and ground to make 90% of the feed particle size less than 15 μm.
— The basic design for an 80-t/day plant fed with 4 wt% copper molybdenite concentrate requires five backmixed reactors in series, each measuring 8 m3, operating at 190 °C and with a reaction time ...
— The results demonstrate that the bioleaching of the Cu-containing molybdenite concentrate leads to the dissolution of the chalcopyrite phase, with variable …
— The subject of this study is a molybdenum concentrate produced by flotation of copper-molybdenum ores from the Erdenet mineral deposit. The molybdenum concentrate composition (wt%) is 45.23% Mo, 2.30% Fe, and 1.41% Cu. ... Kinetics of pressure oxidative leaching of molybdenite concentrate by nitric acid. Hydrometallurgy, …
in these experiments were analytical grade. Before the leaching process, the molybdenite concentrate was ball milled for 4 h at the speed of 250 rpm and with the ball to powder ratio of 3:1 as a mechanical activation process. 2.2 Leaching Pocr ess Leaching processes were performed in a specially designed autoclave.
— 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 …
— The proposed method of sulfidation and leaching can be used effectively for the removal of copper from molybdenite concentrates when the copper impurity is in the form of refractory chalcopyrite mineral, which is the case for the majority of Chilean …
— 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.
— 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. ... The concentrate leaching system consists of the unleached concentrate …
— 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 ...
ide. To achieve this objective, the process of roasting of molybdenite concentrate was studied in the wide range of temperatures, and sodium carbonate was tested as a roasting additive instead of sodium chloride. Materials and Procedures Study Object. To perform the study, high copper-content molybdenite flotation concentrate was used,
— Furthermore, a conceptual hydrometallurgical treatment process for molybdenite concentrate was proposed, aiming to recover molybdenum, sulfuric acid, and copper. ... The effect of silver on the acidic ferric sulfate leaching of primary copper sulfides under recycle solution conditions observed in heap leaching. Part 4: Semiconductor …
The application of leaching processes for molybdenite separation and purification from porphyry copper deposits represented slow leaching kinetics because of the presence of …
— Copper and iron elimination from molybdenite concentrate by sulfidation and leaching of the sulfidized concentrate in H 2 SO 4 –NaCl–O 2 media. Is should be point out that the leaching solutions produced by this method could be treated by the conventional solvent extraction and electrowinning technology to produce copper cathodes, and the ...
— In this process, the leaching agent is produced by electric current and through anodic and cathodic reactions, and finally, it causes the leaching of molybdenite concentrate. Few studies have been performed on the extraction of molybdenum from copper-containing molybdenite concentrate using the electroleaching process.
— Typically, rougher molybdenite flotation and recovery from bulk copper/molybdenum concentrates involves the use of alkalisulfides, Nokes reagents, cyanides, oxidants, and/or thermal treatment to depress copper sulfide minerals. The bulk copper/molybdenum feed generally varies from 0.2% Mo to 1.0% Mo, and with …
— In this study, the leaching rate of molybdenite concentrate was evaluated in sulfuric medium, and the influence of the diverse oxidants including hydrogen peroxide, manganese oxide, copper sulfate ...
— Kinetics of pressure oxidative leaching of molybdenite concentrate by nitric acid. Hydrometallurgy, 111 (2012), pp. 52-57. View PDF View article View in Scopus Google Scholar. Kruesl, 1972. ... Sulphuric acid leaching of mechanically activated copper sulphidic concentrate. Miner. Eng., 24 (2011), pp. 1713-1716.
— 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.. …
— The preparation process of sodium molybdate has the disadvantages of high energy consumption, low thermal efficiency, and high raw material requirement of molybdenum xide, in order to realize the green and efficient development of molybdenum concentrate resources, this paper proposes a new process for efficient …
— Copper extraction during water leaching of cinder versus roasting temperature: (a) duration -90 min, NaCl consumption -150% of the concentrate mass, (b) duration -120 min, Na 2 CO 3 consumption ...
DOI: 10.1016/J.HYDROMET.2013.05.012 Corpus ID: 97794733; Kinetics of copper dissolution in the purification of molybdenite concentrates by sulfidation and leaching @article{Padilla2013KineticsOC, title={Kinetics of copper dissolution in the purification of molybdenite concentrates by sulfidation and leaching}, author={Rafael Padilla and Hugo …
— On the other hand, molybdenite ores are the primary source of Re as 100 to 3,000 ppm of Re has been found in molybdenite in porphyry copper deposits. ... Cu, Fe, and S ions obtained from pressure oxidative leaching of molybdenite concentrate was investigated. The results showed that the extraction at a concentration of A:O = 1:25, …
— Purification of molybdenite concentrate from copper concentrates was performed by sulfation. The sulfation of molybdenite concentrates was carried out with pure sulfuric acid (> 96%) at 160–190 °C to study the influence of the reaction temperature and reaction time on the residual copper in the molybdenite concentrates. A purified …
DOI: 10.1016/j.hydromet.2020.105284 Corpus ID: 212890043; Co-volatilizing-water leaching process for efficient utilization of rhenium-bearing molybdenite concentrate @article{Sun2020CovolatilizingwaterLP, title={Co-volatilizing-water leaching process for efficient utilization of rhenium-bearing molybdenite concentrate}, author={Hu Sun and …
— In this study, the selective dissolution of copper and iron from the molybdenite (MoS 2) concentrate consisting of chalcopyrite and pyrite by acidic sodium nitrate leaching has been investigated to improve the quality of molybdenite.The influence of various leaching parameters, namely sodium nitrate (NaNO 3) and sulfuric acid (H 2 SO 4) …
— Semantic Scholar extracted view of "Molybdenum extraction from molybdenite concentrate in NaCl electrolyte" by Zhan-fang Cao et al. ... A study on the kinetics of leaching copper-cadmium slag was carried out.The effects of acidity,solid/liquid ratio,reaction temperature,leaching time on the comprehensive leaching ratio were ...
— In this study, the selective dissolution of copper and iron from the molybdenite (MoS 2) concentrate consisting of chalcopyrite and pyrite by acidic sodium …
— Section snippets Molybdenite concentrate. The MoS 2-containing ore at the Sarcheshmeh Copper Complex also contains Cu-bearing minerals.The MoS 2-containing fraction is separated from Cu-sulfides with a rougher and seven sequential flotation cells in a four series bank.In this process, the molybdenite concentrate is moved to the next …
— The current study was carried out to investigate the kinetics of reactions for the pressure oxidative leaching of a molybdenite concentrate in less than one hour. The effects of oxygen pressure, stirring speed, pulp density, acid concentration and temperature on the leaching rate of the molybdenum were studied.It was found that about 85% of …
— 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.
the copper leaching process with an obtained activation energy of 33.56 kJ/mol. For recovery of the leached copper, the precipitation process was done by the addition of Na 2 S at 45 °C, S/Cu = 1, and pH = 9. Keywords Copper dissolution · Molybdenite · Oxidizing reagent · Copper leaching kinetics 1 Introduction
— The removal of molybdenum from a copper ore concentrate by sodium hypochlorite leaching was investigated. The results show that leaching time, liquid to solid ratio, leaching temperature, agitation speed, and sodium hypochlorite and sodium hydroxide concentrations all have a significant effect on the removal of molybdenum.
— Molybdenite in porphyry ores is a byproduct of copper concentrate, therefore it is more reasonable to establish both the grinding size and the flotation scheme for copper minerals. [8] Fig. 19 (a) [ 13 ] displays the average size by size recovery of molybdenum and copper for 18 months in the Bingham Canyon mine.
— Alkaline leaching of copper concentrate bearing molybdenite was investigated. Thermodynamic analysis of Mo-S-H 2 O and Cu-Fe-S-H 2 O indicates that alkaline leaching of copper concentrate is feasible for selective extraction of molybdenum. The oxidation mechanisms of sulfide ores in the copper concentrate were discussed …
— 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.
