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 in-vestigated.
The kinetics of molybdenum and copper extraction from Sarcheshmeh molybdenite concentrate (Kerman, Iran) was studied by electroleaching process in batch mode. The effects of several critical parameters including sodium chloride concentration, pH, temperature, time, operating voltage, and the sodium carbonate addition on the molybdenum …
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 that with the …
Sulfidation leaching is effective for copper removal from molybdenite concentrates. •. Chalcopyrite copper in molybdenite concentrate was lowered to less than 0.2 …
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 …
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 …
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.
Separation of chalcopyrite from molybdenite is currently mainly carried out by flotation, but this process is costly because of the extensive use of inhibitors. This study briefly describes a 7.0T/100CGC low-temperature superconducting magnetic separator and discusses its separation principle as well as the effect of magnetic induction on chalcopyrite separation from …
With additional FeS2 (test 10), the concentration of Fed increased relatively slowly as the result of pyrite oxidation. 3.2. Bioleaching of 6% (w/v) molybdenite concentrate in 9 K medium formulation The bioleaching of Cu in 6% (w/v) molybdenite concentrate pulp was tested at three temperatures (Fig. 4).
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 …
By the subsequent ammonia leaching, 91.5% molybdenum was leached out from the calcine produced from oxidative roasting of the acid-leached concentrate, while only 79.3% Mo was leached from the ...
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. From the resu...
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 …
The technology of molybdenum extraction from molybdenite concentrate by using potassium chlorate (KClO 3) or sodium chlorate (NaClO 3) has been investigated.
The molybdenum concentrate used in the experiments is produced from copper ore and contains a significant amount of Cu. Since the behavior of Cu during roasting of MoS 2-based concentrate is also important, Mo-O-S and Cu-O-S systems were investigated together in the thermodynamic analysis.. In this part, all graphs are drawn with the FactSage program.
The obtained results represented the probable molybdenite dissolution and the formation of various types of copper sulfide, iron chloride, and copper chloride complexes in …
Semantic Scholar extracted view of "Copper removal from molybdenite concentrate by sodium dichromate leaching" by M. C. Ruiz et al. Skip to search form Skip to main content Skip to account menu. Semantic Scholar's Logo. Search 221,614,655 papers from all fields of science. Search ...
In Sarcheshmeh Copper Complex, a molybdenite floatation concentrate was produced by selective removal of copper impurities with 7 stages of cleaner floatation banks, that contains around 1% copper and 54.5% molybdenum. Mineralogical studies, physical and chemical characterizations showed that the sample contained 91% molybdenite (MoS2), …
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 and X-ray.
Molybdenum is commonly obtained as a byproduct from treatment of porphyry copper ores in which molybdenite is a minor constituent. The conventional separation process is differential flotation, which includes successive re-cleaning steps required to produce high-grade molybdenite concentrate [1], [2], [3].As a result of the many steps involved in the production …
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 paper discusses methods of processing copper-containing molybdenite concentrates. A process flow diagram based on roasting with sodium chloride (or carbonate) …
Meanwhile, they concluded that at 100 °C, about 80% of Cu was dissolved from the concentrate, and a chemical surface reaction was proposed to control the leaching process due to an activation energy of 79 kJ/mol. Ruiz and Padilla (1998) presented 95% Cu dissolution from molybdenite concentrate by leaching with 0.3 M H2SO4 and 0.12 M Na2Cr2O7 solution at …
In this study, optimal conditions for maximum copper leaching (> 99%) were obtained at the concentration of HCl = 1 M, FeCl3 = 0.5 M, CuCl2 = 0.05 M, CaCl2 = 0.5 M at …
In a copper‑molybdenum processing plant, copper sulfide concentrate (such as chalcopyrite) is floated together with molybdenite in the first stage. [7] The separation of molybdenite and copper sulfide is achieved in the second stage through flotation. [8] In most scenarios, copper sulfides, such as chalcopyrite, are depressed using a depressant (e.g. …
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 …
DOI: 10.1016/J.MINPRO.2014.02.003 Corpus ID: 95624381; Mesophilic and thermophilic bioleaching of copper from a chalcopyrite-containing molybdenite concentrate @article{Abdollahi2014MesophilicAT, title={Mesophilic and thermophilic bioleaching of copper from a chalcopyrite-containing molybdenite concentrate}, author={Hadi Abdollahi and Sied …
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 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 stage and the Cu-bearing tailing is diverted to the previous …