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Oxidation of elemental sulfur and chalcopyrite Oxidation of sulfur and mineral sulfides was studied in 500 and 250 ml shake flasks (160 rpm) with a liquid volume of 200 and 100 ml, respectively. The nutrient salts media and ore concentrates were autoclaved, while sulfur was heat-sterilized at 110°C over night.
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Dec 1, 2021After the flotation tests, the products, including concentrate and tailing, were collected, dried at 60 °C for 12 h and weighed to calculate the recovery of chalcopyrite. 2.5. Methods 2.5.1. Contact angle measurements
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DOI: 10.1016/0892-6875(94)90132-5 Corpus ID: 95771027; Distribution of surface metal ions among the products of chalcopyrite flotation @article{Kant1994DistributionOS, title={Distribution of surface metal ions among the products of chalcopyrite flotation}, author={Chander Kant and S. Ramachandra Rao and James A. Finch}, journal={Minerals Engineering}, year={1994}, volume={7}, pages={905-916} }
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Sulfur in the prepared chalcopyrite can be fixed in the electrode during charging-discharging because copper and iron are sulfur-friendly elements in nature. The fixing of sulfur leads to a high initial charge capacity (1300 mA h g −1 at the initial discharge current density of 100 mA g −1 ), excellent rate performance, and good cycling ...
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The current research status and the obstacles in the recovery of cyanide, gold-silver, sulfur-iron, copper-lead-zinc, and & ldquo;low-value content & rdquo; from cyanide tailings are then reviewed in detail. These processes can be used independently or in conjunction with other treatment methods depending on the nature of cyanide tailings.
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3D Characterization, Analysis, and Simulation of Multiphase Particulate Systems in Mineral Processing Using X-ray Computed Tomography; Water Structure at Hydrophobic Surfaces, J.D. Miller, 2 presentations, Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta, Canada.
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Chalcopyrite Nababeep West Mine, Nababeep tungsten mines, Okiep Copper District, Namakwa, Northern Cape, South Africa ... Muller, E., Cartigny, P., Rollion-Bard, C., Assayag, N., & Philippot, P. (2017). Iron and sulfur isotope constraints on redox conditions associated with the 3.2 Ga barite deposits of the Mapepe Formation (Barberton ...
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this work package was divided into four tasks concerning the following objectives: - definition, collection and characterization of primary raw materials, - definition, collection and characterization of secondary raw materials such as flotation tailings and metallurgical wastes, - collection and characterization of materials and intermediate .
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froth flotation flotation determining tails Prior art date 1999-05-04 Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Expired - Fee Related Application number US09/305,787 Inventor Yves Breau Martin ...
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The dominance of attached A. caldus cells may be owing to the formation of elemental sulfur on the surface of chalcopyrite and that A. caldus can use elemental sulfur as an energy source more effectively ... Liu JS (2013) Characterization of iron-sulfur cluster assembly protein isca from Acidithiobacillus ferrooxidans. Biochem Mosc 78:244-251
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characteristics of chalcopyrite grains on their leaching by sulphuric acid solution in the presence of sodium nitrate. Method for characterization In this paper, chemical, XRD and qualitative and quantitative microscopic analysis were used to determine the characteristics of the samples of complex concentrate and leach residue.
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The concentrate powder was composed mainly of free chalcopyrite and low quartz in about 3:1 weight ratio. The particle size was about 100 μm. Spectroscopic studies (FTIR, Raman, UV-visible) of the concentrate supported the XRD findings, and also revealed a marginal oxidation of the sulfide phase.
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Concentrates obtained by flotation of such ores are unsuitable for pyrometallurgical processing owing to their poor quality and low metal recovery. This paper presents the leaching of chalcopyrite concentrate from the location "Rudnik, Serbia". The samples from the flotation plant were treated with hydrogen peroxide in sulfuric acid.
Get priceTo isolate Ferroplasma thermophilum L1(T) from a low pH environment and to understand its role in bioleaching of chalcopyrite. Methods and results Using serial dilution method, a moderately thermophilic and acidophilic ferrous iron-oxidizing archaeon, named L1(T), was isolated from a chalcopyrite-leaching bioreactor.
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The prior addition of PGA achieved an improved selective flotation of chalcopyrite from pyrrhotite at pH 8, at which the grade and recovery of chalcopyrite in concentrate were over 80%.
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Results show slightly higher spe gene expression in sulfur media: gene expression is higher for speE and speD in sulfur and chalcopyrite compared to tetrathionate (S 4 O 6 2−) and iron conditions. speA does not show expression changes for any condition, which suggests it is a constitutive gene. The presence of spermidine in the supernatant ...
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Crystalline phase and surface morphologies of the crystals were characterized by X-ray diffraction and scanning electron microscopy, respectively. Volume ratio of solvent, reaction temperature, reaction time, and sulfur source were found to be the key parameters for the formation of pure pyrite crystals.
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1. Whitmire, K. H.; Schipper, D. E., In pursuit of advanced materials from single-source precursors based on metal carbonyls. Dalton Trans. 2019, 48, 2248-2262, DOI ...
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Characterization and Flotation of Sulfur from Chalcopyrite Concentrate Leaching Residue. H. K. Lin. J. of Minerals and Materials Characterization and Eng. Vol.2 ,June 12, 2003 DOI: 10.4236/jmmce.2003.21001 7,906 Downloads 10,284 Views Citations. The Analysis of an HIV and AIDS Empowering Group Work Programme for ...
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The flotation reagent consumptions are minimum. The majority of chalcopyrite remains in the sulfur flotation tailings and can be readily recovered by flotation with different flotation reagents. When amyl xanthate is used, 85% of chalcopyrite can be recovered with a copper grade of 14.5% in a single-stage froth flotation.
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This study explores the flotation behavior of chalcopyrite in the presence of different concentrations of sodium sulfide (Na2S·9H2O) at pH 12 under controlled potential conditions. It was observed that the flotation of chalcopyrite is not depressed completely when the pulp potential is low, even at high concentrations of sodium sulfide, i.e., 10−1-10−2 mol/L. However, a partial and ...
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The resulting primary sulfur product during metal sulfide dissolution, depends on which sulfide mineral is bioleached. The resulting primary sulfur product is subsequently chemically or biologically transformed into elemental sulfur or sulfate. 46 Disulfides FeS 2, MoS 2 and WS 2 are degraded over thiosulfate as the main intermediate. Exclusively iron (III) ions are oxidative solubilizing agents.
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Jan 20, 2022The capacity of elements in the chemical formula chalcopyrite is considered as Cu +1 Fe +3 S 2−2. chalcopyrite is a stable mineral due to its building arrangement, which is filled with tetragonal lattice with center surfaces, and requires strong oxidizing to break it down.
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(d) Chalcopyrite flotation on tailings of sulfur flotation. The tailings of sulfur flotation conducted at close to neutral pH with pine oil, kerosene and sodium silicate as the frother, the collector and the dispersant, respectively contain about 4% copper and 10% sulfur. Quartz is the major component in the tailings.
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The present invention relates to a mineral processing technology and method for refractory chalcopyrite ores, particularly to a mineral processing technology and method for the separation of chalcopyrite from multiple natural types of copper ores containing chalcopyrite, pyrrhotite, talc and serpentine, which belongs to the technical field of mineral processing.
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Char acterization and Flotation of Sulfur from Chalcopyrite Concentrate Leaching Residue H. K. Lin Mineral Industry Research Laboratory University of Alaska Fairbanks, Fairbanks, AK 99775 -7240 Elemental sulfur produced by chloride leaching of sulfide ores or concentrates contains selenium and tellurium usually too high to be used in
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Characterization and/or process operations presented in the following discussion include: Copper ore d eposit, Mineralogical formation, Flotation chemistry, Smelting and converting by pyrometallurgy, and Leaching processes by hydrometallurgy, both managed and natural. The authors assume that the reader has basic knowledge about
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However, Klauber 5 has claimed the characterization techniques used to identify the possible layer formed on chalcopyrite surface and stated that the only products resulting from mineral oxidation that had been demonstrated were sulfur and jarosites. The author also stated that sulfur is not able to stop chalcopyrite dissolution since this ...
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The results of morphological and Biochemical Characterization shows that some of the bacteria belong to the Acidithiobacillus species and a few other Bacillus species that have been well documented in literature. 11 Also results of growth pattern due to bacterial count, incubation time, and temperature (Figures 1-5) further confirms that these ...
Get priceChalcopyrite is one of the most abundant and refractory minerals. Currently, about 80% copper is produced by pyrometallurgical technology. The formation of sulfur dioxide during pyrometallurgical processes has a serious impact on environmental protection, and governments are tightening environmental restrictions to control the sulfur dioxide ...
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Valuable mineral in an ore such as chalcopyrite ore can be separated from each other and from worthless gauge minerals by the froth flotation process. The process was developed in Australia at the start of the 20 th Century to treat the primary sulfidic silver/lead/zinc ore at Broken Hill (Woods and Doyle, 2000).
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Important factors in characterization includes solid phase, aqueous phase with solutes, gas or the second liquid phase, the three kinds of interface and interline, flow and force parameters and end products. The dispersed-air flotation looked preferable than dissolved air flotation.
Get priceSynthesis and Characterization of Phase-pure Copper Zinc Tin Sulfide (Cu2ZnSnS4) Nanoparticles. NASA Astrophysics Data System (ADS) ... A flotation concentrate with 8.78% Zn and 9.25% Pb was obtained, and the recovery of Zn and Pb reached 56.14% and 75.94%, respectively. ... massive chalcopyrite leachate showed the highest titrable acidity of 1 ...
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The flotation reagent consumptions are minimum. The majority of chalcopyrite remains in the sulfur flotation tailings and can be readily recovered by flotation with different flotation reagents. When amyl xanthate is used, 85% of chalcopyrite can be recovered with a copper grade of 14.5% in a single-stage froth flotation.
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Flotation tailings are hazardous due to physical and chemical instability and are currently considered one of the main pollution concerns of mining industry. Most of these tailings are fine-grained residues with low copper content (0.1-0.8%) and include toxic compounds, such as heavy metals, arsenic, and flotation reagents, among others.
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Abstract An investigation on the surface properties and collector adsorption was conducted after the galvanic interaction of chalcopyrite and pyrite in the flotation system. The surface compositions were studied through the metal ion dissolution test and X-ray photoelectron spectroscopy (XPS) characterization. The galvanic effect on flotation behavior was examined by the flotation test of ...
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Characterization techniques can be performed directly on viscous dithiocarbamate. The other state is the solid form, known as precipitate. Precipitate can be washed, dried, and weighed for further applications, such as coordination compounds' preparation and materials chemistry. Crystals can be grown from both states of dithiocarbamates. 3.
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