— 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.

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 ...

 — The results of leaching of molybdenite concentrate of J SC Almalyksky MMC are compared ... optimal conditions for maximum copper leaching (> 99%) were obtained at the concentration of HCl = 1 M ...

 — 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 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 ...

 — 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 …

 — 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 native strain of A. ferrooxidans in less than 15 days. Ferrous sulfate, sulfur or pyrite was ...

 — 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 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 …

 — 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 …

 — 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, …

 — 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 ...

 — 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 …

 — 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 …

 — 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.

 — 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 …

 — 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 results demonstrate that the bioleaching of the Cu-containing molybdenite concentrate leads to the dissolution of the chalcopyrite phase, with variable …

 — Re-bearing solution is usually obtained from roasting fume/dust, leaching residue, and pregnant leaching solution (PLS) [10]. Re could be recovered during the roasting process of molybdenite concentrates from wet scrubbing liquors as perrhenic acid (HReO 4) [[2], [6]]. The supply, the extraction and recycling of Re have received a much ...

 — 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 …

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 …

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 …

 — 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, …

 — The process involves a sulfidation of the molybdenite concentrate with S 2 (g) at 380 °C followed by a leaching stage with H 2 SO 4 –NaCl–O 2. 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. Molybdenite dissolution was ...

Since the chalcopyrite-reacted products in the sulfidized molybdenite concentrate are essentially a mixture of covellite and pyrite, the main leaching reactions occurring concerning copper during the pressure leaching will be[13,14] CuSðsÞ þ 0:5 O2 ðgÞ þ H2 SO4 ¼ CuSO4 ðaqÞ þ S ðsÞ þ H2 OðlÞ ½2 CuS þ 2O2 ðgÞ ¼ CuSO4 : ½3 ...

 — 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.

 — 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.

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.

 — 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% …

 — 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 …