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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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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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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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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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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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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In this article, a comprehensive review of the fundamental studies of depres-sion mechanisms and effectiveness of commonly used reagent systems to depress pyrite is presented.
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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 were found to be effective pyrite …
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Despite being a major cyanide species in the process water, it is unclear how iron cyanide influences pyritic gold ore flotation as well as how lead ions influence pyritic gold ore flotation in the presence of iron cyanide. This study aims at revealing the interaction of Fe(CN)63− and lead ions in pyrite flotation to investigate the strong depressing effect of Fe(CN)63− on …
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The pyrite rougher concentrate was obtained by two-stage copper and pyrite rougher flotation using the conditions in Table 1 and reported in Agorhom et al. (2013). However, in the present studies, the focus is to examine flotation depression of pyrite after regrinding the combined pyrite rougher concentrates using aeration and DETA (Fig. 1).
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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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In this study, pyrite was used as the research object, and the behavior and mechanism of a copper-ion-enhanced organic depressant in depressing pyrite flotation were studied. Microflotation experiments showed that, after the addition of CuSO4 and N,N-dimethyldithiocarbamate (N,N-DDS), the floating collection efficiency of pyrite declined from …
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The toxic cyanides in cyanide residues produced from cyanidation process for gold extraction are harmful to the environment. Pyrite is one of the main minerals existing in cyanide residues. In this work, the interaction of cyanide with pyrite and the decyanation of pyrite cyanide residue were analyzed. Results revealed that high pH value, high cyanide concentration, and …
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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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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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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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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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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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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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Froth flotation is an effective method for separating chalcopyrite from pyrite, using various flotation reagent depressants to amplify both minerals' surface differences in hydrophobicity [7], [8].Generally, lime is the depressant of pyrite in most of the concentrator plants [9], [10].There are two aspects to the depression mechanism of lime on pyrite.
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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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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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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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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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Surface cyanoferric species were identified, both electrochemically and spectroscopically, on pyrite surface in the presence of cyanide, inhibiting the oxidation 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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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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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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DOI: 10.1016/j.apt.2024.104424 Corpus ID: 269071577; Enhanced pyrite depression through nitrogen-aerated flotation under low alkalinity conditions @article{Wang2024EnhancedPD, title={Enhanced pyrite depression through nitrogen-aerated flotation under low alkalinity conditions}, author={Yunfan Wang and Dayong Wei and Shuming Wen and Qiqiang Lin and …
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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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