Molybdenite Concentrate Copper Leachingri

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 purification by a hydrometallurgical method is …

A procedure for recovery and separation of molybdenum (VI) and copper (II) from acid leaching residual solution of Chilean molybdenite concentrate by solvent extraction is …

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 of …

Silver-catalyzed bioleaching of copper, molybdenum and rhenium from a chalcopyrite–molybdenite concentrate Olli Tuovinen 2015, International Biodeterioration & Biodegradation

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 xide in 40 min at 823 K.

Here molybdenum concentrates are slurried with hot ferric chloride leach solution to dissolve the copper and lead contaminants present. The primary function of the filtration and …

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 ...

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 recleaning steps in order to …

Alkaline leaching of copper concentrate bearing molybdenite was investigated. Thermodynamic analysis of Mo-S-H2O and Cu-Fe-S-H2O indicates that alkaline leaching of copper concentrate is feasible ...

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 added to culture medium to enhance the activity of bacteria. ...

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 …

economically a high-grade molybdenite concentrate that contains less than 0.5% of copper [8–10]; generally, a long and complicated otation process is required [], which 9 leads to signicant losses in molybdenum recovery [10]. On the other hand, to avoid excessive molybdenite losses, the copper content in the nal concentrate varies from 2–4 wt%,

The results show that leaching time, liquid to solid ratio, leaching temperature, agitation speed, and sodium hypochlorite and sodium hydroxide concentrations all have a …

In order to achieve lower levels of copper — but also avoid excessive molybdenite losses — a continuous sulfation-leaching process is investigated and applied successfully on a pilot scale. …

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 (53.8% Mo) also …

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 ...

In this study a molybdenite concentrate was refined by the selective removal of copper. The main objective of this study was to investigate the removal of copper in 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 …

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 stage.

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 ...

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 ...

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 data show thatthe

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 222,184,689 papers from …

Efficiency of Copper Bioleaching of Two Mesophilic and Thermophilic Bacteria Isolated from Chalcopyrite Concentrate of Kerman-Yazd Regions in Iran Soheila Yaghmaei Scientia Iranica, 2007

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 …

Rhenium is occurring in the form of rheniite (ReS 2), because of the fact that Re rarely presents on its own sulfide minerals, Re is distributed within molybdenite and extracted as a by-product of molybdenum [5] (e.g., the concentration of Re in copper/molybdenum sulfide concentrates after flotation is in the range of 50–100 ppm [6].On the other hand, molybdenite …

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 significant effect on the …

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 …

acid-leached concentrate (leaching residue) was roasted at 550 C for 100 min. 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 calcine produced by roasting molybdenite concentrate without pretreatment.

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 ...