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 on the leaching rate was studied. Also, the effect of the addition of the ethylene glycol to the hydrogen peroxide was studied and results showed …
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A technique for leaching molybdenum from low-grade roasted molybdenite concentrate was proposed by the aqueous solution containing sodium chlorate and …
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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 added to ...
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leaching of molybdenum and recovery of copper from complex molybdenite concentrate is an effective separa- tion method. The diffusion control model can be used to describe …
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As an example of the oxidative roasting of low grade Mongolian molybdenite concentrate, more than 95% of 53 mu m particle size molybdenite was converted to molybdenum trioxide in 40 min at 823 K.
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In this study, the selective dissolution of copper and iron from the molybdenite (MoS2) concentrate consisting of chalcopyrite and pyrite by acidic sodium nitrate leaching has been investigated to ...
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1. Introduction. Molybdenite (MoS 2) concentrates are commonly obtained as byproduct in the treatment of copper porphyry ores in which the molybdenite is a minor constituent.The conventional process to separate molybdenite from the bulk copper–molybdenum concentrate is differential flotation, which includes successive …
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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 ...
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In order to reduce the copper content, molybdenite concentrates are generally leached with a ferric chloride solution (Brenda process) or cyanided, although …
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Abstract. 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 …
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This study evaluated silver-catalyzed bioleaching to solubilize copper from a chalcopyrite-bearing molybdenite concentrate with mesophilic (32 °C) and moderately thermophilic (45 °C) microbial consortia.The Cu content of the concentrate was 0.98% (wt/wt), with chalcopyrite as the major Cu-bearing mineral. The molybdenite phase …
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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.. …
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Molybdenite is the most important molybdenum concentrate, which is mainly recovered as a by-product from porphyry copper deposits. Due to the low efficiency of purification processes such as flotation in the reduction of copper content of molybdenum concentrate to a standard level (i.e., less than 0.5 wt.%), further …
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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 …
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It indicated that small amount of molybdenite accompanied in the copper concentrate was more easily oxidized compared with other sulfides. Combined with research results of two companies, it inspired us that molybdenite can react with metal sulfide to form molybdenum matte which can be separated from the melting matte by …
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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.
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In recent years, there has been an increasing focus on the hydrometallurgical processing of molybdenite, with the decline of high-grade and easily handled molybdenum minerals. In this work, a novel method of selective extraction of complex molybdenite concentrate, which is characteristic of high-grade copper ore, has been investigated. …
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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 …
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In recent years, there has been an increasing focus on the hydrometallurgical processing of molybdenite, with the decline of high-grade and easily handled molybdenum minerals. In this work, a novel method of selective extraction of complex molybdenite concentrate, which is characteristic of high-grade copper ore, has been investigated. The results …
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Molybdenite Concentrate Copper Leaching. 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 both, into the leaching solution.
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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. ... pH, potential, pulp density, or addition of silver as catalyst. Optimal copper–iron dissolution is obtained using extreme thermophilic ...
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tive leaching of molybdenite from molybdenite concentrates when the copper impurity is in the form of chalcopyrite. An additional goal was to economically reclaim copper, and the leaching kinetics of molybdenite have been investigated. Experimental The ore sample (Mo 35.40%, S 28.40%, Cu 7.90%, P 0.04%, As 0.10%, CaO 0.17%, SiO 2
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Semantic Scholar extracted view of "Copper leaching from chalcopyrite concentrate in Cu(II)/Fe(III) chloride system" by Jianming Lu et al. ... In this research work, the copper compound which exists in the form of sulfide in molybdenite concentrate (M1 and M2 samples) dissolved with a mixed solution of iron chlorides (FeCl3 and FeCl2), …
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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 …
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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 …
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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 …
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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 …
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copper flotation circuits and were taken before entering the molybdenum circuit. The Morenci copper/molybdenum concentrate analyzed 0.2%-0.4% Mo and 28%-33% Cu, while the grade of the Copperton copper/molybdenum concentrate was 2.5%-4.1% Mo and 32%-34% Cu. The concentrates were received at 20%-35% solids. The particle size …
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