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 …
The purpose of this study was to evaluate the bioleaching of copper from a chalcopyrite-bearing molybdenite flotation concentrate using a shake flask technique and mesophilic and thermophilic microorganisms.
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 thickening circuits is to recover spent ferric chloride leach solution from the leached moly concentrates. Since approximately 2.5 percent of the ferric chloride in ...
Abstract. 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 …
In this study, the leaching rate of molybdenite concentrate was evaluated in sulfuric medium, and the influence of the diverse oxidants including hydrogen …
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. In this …
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. …
In order to determine the optimum parameters for the total oxidizing roasting process of molybdenite concentrate to produce MoO 3 and purify the MoO 3 product by removing the copper ... roasted product was leached with H 2 SO 4 to remove copper. Leaching conditions were optimized by investigating the effects of different H 2 SO 4 …
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 ...
June 2022. DOI: 10.1007/s42461-022-00628-7. Authors: Igor Wilkomirsky. University of Concepción. J. Becker. Fernando Parada L. University of Concepción. Request full …
A process has been developed for leaching copper, lead and calcium from molybdenite concentrate. The leachant is a solution containing an oxidizing chloride (e. g., CuCl//2, FeCl//3) and an ...
Direct oxidative leaching of molybdenite from copper concentrate by caustic-hypochlorite solution (Liu et al., 2011) is an environment-friendly method with high molybdenum recovery. However the operation is still inconvenient because of an over-swelling phenomenon and high cost of NaClO.
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 …
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 …
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 ...
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 …
Molybdenite flotation concentrate was leached with sodium dichromate–sulfuric acid solutions in order to remove the copper sulfide impurities. The …
Abstract. Molybdenite (MoS 2) has been found to leach slowly in dilute (1–4 M) nitric acid at room temperature, to yield solutions of molybdic acid (H 2 MoO 4) and sulphuric acid. The solutions are supersaturated with respect to MoO 3 β 1 2 H 2 O, which is easily precipitated from the filtered pregnant solution as a fibrous crystalline solid ...
The kinetics of molybdenum and copper extraction from Sarcheshmeh molybdenite concentrate (Kerman, Iran) was studied by electroleaching process in …
Furthermore, in most cases, it is necessary to use a final step, namely chemical purification of the molybdenite concentrate, to reduce the copper content to a level suitable for marketing. Common methods of chemical purification in industrial practice include the cyanide leaching, ferric chloride leaching, and hydrochloric acid leaching ...
Ferric chloride leaching of molybdenite concentrate. Gupta (1992) reports that the ideal leaching solution for CuFeS 2 removal from MoS 2 contains 30% CaCl 2, 10% FeCl 3, 3% HCl, and 1% CuCl 2 (all percentages are weight percentages). It is widely held that the leaching proceeds via Eq. (1). (1) CuFeS 2 + 4 FeCl 3 → CuCl 2 + 5 FeCl 2 …
CONCLUSIONS It was found that concentrated sulfuric acid leaching (190-240 C) activated by microwaves, in a batch-type ambient pressure process, decreased the copper content of the molybdenite concentrate from 3.6% to less Molybdcnite conccntrate cleaning by copper sulfation activated by microwave 1419 than 0.1 h (>95% …
To meet consumer requirements, molybdenite concentrate should contain less than 0.5 percent copper. 5 When copper is present in the form of chalcopyrite, …
In order to reduce the copper content, molybdenite concentrates are generally leached with a ferric chloride solution (Brenda process) or cyanided, although …
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 …
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% to …
of time on the leaching rate of molybdenum and copper was studied. As shown in Fig. 1, the leaching rate of molybde-num and copper reached 98.05% and 96.81% after 360 min, respectively. Molybdenum and copper in the molybdenite concentrates were completely leached into the liquid after 6 h in the conventional electro-oxidation process.
Nitric acid concentration was an important parameter in pressure leaching of the molybdenite concentrate. At least 35–40 g/L nitric acid was required for the leaching of 100 g/L molybdenite concentrate (containing 92% of molybdenite). 4. An increase in the amount of pulp density decreased the leaching efficiency of the molybdenum.
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 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 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 ...
For upgrading molybdenite concentrates for further processing, it may be feasible to minimize the Cu content of molybdenite through bioleaching. For the present study, the feasibility of the bioleaching of copper was assessed with a molybdenite flotation concentrate which contained chalcopyrite as well as pyrite (FeS 2) as the minor …
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.
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.
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.
Extraction and processing constitute an important area in the metallurgy of molybdenum. Molybdenum xide (MoO3) production is one of the most important stages in molybdenum production. In this study, the effects of different furnace types on MoO3 production were investigated by using molybdenum concentrate as a raw material …
The copper extraction degree (Equation (1)) was determined by calculating the ratio between the copper content in the analyzed leach solutions [Cu] 2 (g/L) and the total copper content in the powdered sample of a specific mass of concentrate [Cu] 1 that undergoes leaching (g/L). In order to accurately calculate the leaching degree, it is ...
Molybdenite (MoS 2), driven by its unique sandwich structure, is chemical inert and hydrophobic leading to a high refractory sulfide ore, and Co-white alloy, due to its grinding and corrosion resistance, is a refractory product (mainly containing Co, Fe, Cu and Si) for use in traditional hydro-metallurgical processing.In this work, a novel, two-step …