Pyrite flotation was induced by xanthate (1.1 × 10 −4 mol/L) and activated by copper cations (2.6 × 10 −4 mol/L). In the presence of sulfite (1.9 × 10 −3 mol/L), the recovery dropped from 70% to 53% (pH 7) and from 69% to 58% (pH 9). …
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The tests for flotation pyrite depression were performed in a 1 L self-aerated laboratory cell from the Denver brand. It had an impeller at the bottom of the apparatus and a …
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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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The strong depression of pyrite in copper flotation at highly alkaline pH is owing to pyrite oxidation and the formation of hydrophilic ferric hydroxide (Fe(OH) 3) on pyrite surfaces …
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Pyrite is the most abundant sulfide mineral which requires being separated from other base metal sulfide minerals in differential flotation. The chemistry for pyrite flotation and depression was reviewed by Ball and Rickard (1976).In general, pyrite flotation and depression strongly depend on pH.
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Sulphide gives rise to an anodic wave preceding the wave due to xanthate oxidation. The flotation and depression of pyrite are interpreted in terms of mixed-potential mechanisms. ... Gaudin, 1957). Detailed studies involving pyrite, however, are relatively limited. The chemistry of pyrite flotation ancl depression has recently been reviewed by ...
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The more flotation collector you have on, the higher you will need to increase that pH for effective pyrite depression. You also need to insure your pyrite and copper minerals are well liberated for good chemical separation by pH. In froth flotation, depressing pyrite or any metal is impossible if minerals are locked.
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In the flotation of copper sulfides, pyrite is often activated by Cu 2+ ions dissolved from copper-bearing minerals in alkaline media (pH ˃ 9), which results in pyrite entering the copper concentrate. To reduce the floatability of pyrite, we designed a novel functionally modified biopolymer, tricarboxylate sodium starch (TCSS), that showed superior depression selectivity …
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Efficient separation of pyrite is of great importance for the metallurgical performance of flotation processes. Presently, separation of pyrite by flotation is becoming more and more important for reduction of sulfur in coal. In this work Fourier Transform Infrared Spectroscopy (FTIR) and X-ray Photoelectron Spectroscopy (XPS) were used to study the …
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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. ... (2014) found that the three biopolymers differing in molecular weight and polymer chemistry ...
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Theoretical substantiation of activation, deactivation and depression processes in flotation of copper-pyrite, copper-zinc and polymetallic ores with the use of cyanide as well as their regularities are considered. Physico-chemical models derived for various cyanide processes in flotation and automatic control systems
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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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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 potential activator …
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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 measurements revealed that the …
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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 Andreas Lauten}, journal={Minerals …
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The adsorption of GuG on the pyrrhotite surface was chemical adsorption, while GuG was mainly adsorbed on the chalcopyrite surface by hydrogen bonding. Therefore, GuG has a significant depression effect on pyrite flotation and …
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Fenton oxidation modification exhibited desirable depression on the flotation of pyrite, and had negligible impact on the chalcopyrite floatability in this paper. This activity provided a viable option for the Cu-S flotation separation. The corresponding depression mechanism on pyrite lied in the formation of multitude hydrophilic species
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Small changes in the surface chemistry of pyrite may significantly affect its floatability [86]. ... Depression mechanism of pyrite flotation by these organic compounds has been investigated in both non-activated and Cu-activated states [232]. Electrochemical studies conducted on non-activated pyrite flotation showed that the biopolymers, ...
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The mechanisms underlying the depression effect on pyrite flotation may be attributed to the formation of insoluble hydrophilic iron cyanide compounds on mineral surfaces, preventing the chemisorption of xanthate. ... The technologies using various physical, chemical, and biological methods or a combination thereof to detoxify and utilize ...
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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 Processing}, year={1977}, volume={4}, pages={227 …
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Inorganic, organic reagents and non-xanthate collectors are used to depress pyrite. Inorganic depressants act by inhibiting xanthate adsorption. Organic depressants act by adsorption on pyrite forming a hydrophilic layer. Non-xanthate collectors ensure selectivity …
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Xanthate flotation tests show that oxalic acid and other organic acids, as well as sulphuric acid and other inorganic acids and their salts can restore xanthate flotation of pyrite …
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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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The effective depression of pyrite in air flotation by adjusting pulp pH could only be achieved under high alkalinity conditions. However, compared with air aeration, the depression …
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The depression mechanism of sulfite ions on sphalerite and Pb2+ activated sphalerite in the flotation separation of galena from sphalerite still lacked in-depth insight. Therefore, the depression mechanism of sulfite ions on sphalerite and Pb2+ activated sphalerite in the flotation separation of galena from sphalerite was further systematically investigated with …
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Semantic Scholar extracted view of "Lactic acid as selective depressant for flotation separation of chalcopyrite from pyrite and its depression mechanism" by Guang Han et al. ... Chemistry; Journal of Molecular Liquids; View via Publisher. Save to Library Save. ... ABSTRACT The depression of pyrite in the flotation separation of molybdenum ...
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Froth flotation is a common mineral processing technique that is used to remove low economic gangue minerals, such as pyrite, from ore. The main hydrophilization mechanism on the pyrite surface is explained by the formation of hydrophilic iron (Fe) hydroxide and its complexation with calcium (Ca) and magnesium (Mg) ions; however, few quantitative results …
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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 or ...
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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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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 …
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The activation properties of ammonium oxalate on the flotation of pyrite and arsenopyrite in the lime system were studied in this work. Single mineral flotation tests showed that the ammonium ...
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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 calculations. The experiment results demonstrated …
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Thus, understanding why pyrite's flotation performance varies within orebodies and the features affecting its floatability is critical for an efficient depression and possible reclamation of pyrite. Natural pyrite can exhibit different electrochemical properties, chemical composition, and texture depending on the ore genesis.
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