It has been found that moderately oxidizing conditions are favorable for collector-less flotation of pyrite while strongly reducing or oxidizing potentials lead to its depression.
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DOI: 10.1016/J.MINENG.2016.06.018 Corpus ID: 99106529; The depression of pyrite in selective flotation by different reagent systems – A Literature review …
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The separation of chalcopyrite and pyite is not fully solved, and thus more efficient depressants are still needed in industry. This paper used potassium permanganate (KMnO 4) as a pyrite depressant to separate pyrite from chalcopyrite.Flotation and contact angle results indicated that pyrite could be depressed by KMnO 4 at pH 7, while …
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Pyrite accounts for about 60%–70% of the total sulfur in high-sulfur coal (Wang 2013). The main forms of pyrite in coal are finely dispersed pyrite, large blocks of pyrite, invaded …
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Some organic depressants such as dextrin, starch, and guar gum polymers are useful in depression of pyrite flotation [[11], ... This confirms chemical adsorption of LA on the pyrite surface. The hydrophilic hydroxyl groups in the LA structure can significantly enhance the hydrophilicity of the pyrite surface. This prevents subsequent …
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Depression of pyrite in a low-alkaline system has sparked soaring interests for the multi-metal sulfide minerals flotation recently. This study investigates effects of combined depressants (Ca(ClO)2…
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The depression of pyrite flotation is normally difficult especially when pyrite is activated by copper ions. In this study, different biopolymers, modified from lignosulfonate, were examined to depress the flotation of copper-activated pyrite. ... The surface and solution chemistry of pyrite flotation with xanthate in the presence of iron …
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Pyrite is separated from other minerals mainly by flotation. However, the hydrophilicity of pyrite is affected by many factors, causing it to easily enter the concentrate and consequently reduce the quality of concentrate. Highly efficient pyrite depressants can be selectively adsorbed on the surface of pyrite to improve its hydrophilicity, thereby …
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Copper xanthate was formed on copper(II) activated pyrite. Activation mechanism of pyrite by copper(II) salts is likely to be electrochemical where copper occurs as copper(I) on the surface of pyrite. Effective depression is achieved by sulfur dioxide and sodium cyanide. Depression at high pH is due to formation of iron(III) hydroxides.
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Polysaccharide-based depressants have shown satisfactory performance for the depression of pyrite in various flotation systems. However, due to the continuous decrease in the grade and quality of various ore deposits and the increased environmental restrictions, it would be beneficial to introduce other eco-friendly depressants to replace …
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It was interesting to find that 9.5 × 10⁻⁴ mol/L lead ions significantly counteracted the depression of 50 ppm free cyanide on pyrite flotation but did not completely restore the flotation of ...
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DOI: 10.1016/0301-7516(77)90004-7 Corpus ID: 95172929; An electrochemical investigation of pyrite flotation and depression @article{Janetski1977AnEI, title={An electrochemical investigation of pyrite flotation and depression}, author={Noel Janetski and S. I. Woodburn and Ronald Woods}, journal={International Journal of Mineral …
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This investigation is an exploratory study to evaluate a large number of potential pyrite depressants for use during coal flotation. Subsequently, the more promising reagents can be evaluated in detail. Several reagent categories (such as alkalis, lime, oxidizing agents, reducing agents, specific inorganic ions and dispersants) that …
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The species within the red line denote the conditions in which pyrite flotation is observed without collectors. Accordingly, pyrite flotation can only be achieved at ranges of pH below 5 and potential below the continuous upper line without the formation of thiosulfate (S 2 O 3 2−) or iron hydroxide (Fe(OH) 3). At higher pHs and moderate ...
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Inorganic depressants are commonly used in the flotation separation of chalcopyrite from pyrite, but they adversely affect the environment. The use of degradable and environmentally friendly depressants is therefore important. In this work, lactic acid (LA) was used as a suitable and effective depressant for selectively …
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1. Introduction. Pyrite as an associated gangue mineral of polymetallic sulfide ore, needs to be selectively depressed during the flotation process …
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Pyrite is separated from other minerals mainly by flotation. However, the hydrophilicity of pyrite is affected by many factors, causing it to easily enter the …
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Activation flotation of lime-depressed pyrite by sulfuric acid (H 2 SO 4) is usually accompanied by safety hazards and environmental pollution.Exploring eco-friendly, economical and effective activator to replace H 2 SO 4 holds great significance for the sustainable development of mining industry. In this study, carbon dioxide (CO 2) as a …
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On the other hand, associations between pyrite and other sulfides can facilitate galvanic interactions between the two minerals, thus affecting their surface chemistry and flotation performance (Barker, Gerson, and Menuge Citation 2014; Ekmekçi and Demirel Citation 1997; Forbes, Smith, and Vepsalainen Citation 2018; Rao …
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As seen dextrin did not effectively impair the pyrite flotation when the pyrite was oxidized for only 30 min, because the surface density of ferric hydroxide was low, which brought about low dextrin adsorption on the pyrite. With 200 mg/dm3 dextrin, the floatability of pyrite was 60 and 45% with propyl and ethyl xanthate, respectively.
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Pyrite depression in the flotation of copper ores is difficult due to the activation of Cu2+ ions on pyrite surface. In this study, the radical chain reaction involving the redox cycling of Cu(I/II) induced by sodium metabisulphite (MBS) was exploited to selectively depress the flotation of copper-activated pyrite at pH 8.0. Electrochemical …
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ABSTRACT The depression of pyrite in the flotation separation of molybdenum-sulfur (Mo-S) mixed concentrate has become a significant issue. This study aimed to examine the process of separating molybdenite and pyrite in the presence of sodium humate (NaHA). The results of micro-flotation tests indicated that NaHA …
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chemical studies. As pyrite feed grade increased from 5% to 25%, the anodic role of 30 wt% Cr steel did not change, but the anodic role of chalcopyrite and the cathodic role of pyrite were enhanced, promoting ... pyrite depression; copper flotation; galvanic interaction 1. Introduction Chalcopyrite (CuFeS 2) is the most crucial copper (Cu) mineral
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In froth flotation separation, the first use of polysaccharides dates back to 1928 and has continued up to now [34].Although several polysaccharides have been …
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Vast number of research has been conducted on pyrite flotation, producing significant data on this particular matter. ... and activat ion and depression of pyrite were. ... Chemical analyses and ...
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DOI: 10.1016/J.MINENG.2016.06.011 Corpus ID: 99253807; The depression of copper-activated pyrite in flotation by biopolymers with different compositions @article{Mu2016TheDO, title={The depression of copper-activated pyrite in flotation by biopolymers with different compositions}, author={Yufan Mu and Yongjun Peng and Rolf …
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The application of guar gum for pyrite depression in seawater flotation was assessed through microflotation tests, Focused Beam Reflectance Measurements (FBRM), and Particle Vision Measurements (PVM). …
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The flotation chemistry between pyrite and isomeric xanthates (butyl xanthate and isobutyl xanthate) was investigated by means of adsorption experiments, surface tension tests, and molecular dynamic simulations in this work. The flotation chemical results were confirmed and further interpreted by quantum chemical …
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The primary strategy for the depression of pyrite is the addition of modifying reagents in the flotation stage to control pH and ORP during flotation and control de interaction of collectors between individual minerals (Fuerstenau et al., 2007).
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The chemistry of pyrite flotation ancl depression has recently been reviewed by Ball and Rickard (1976). Alkyl xanthates are the most important collectors for the flotation of sulphide minerals. The products of the interaction of these compounds with 228 pyrite have been identified by U.V. and I.R. spectroscopy (Fuerstenm et al., 1968; …
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