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Pyrite, as a disturbing gangue mineral in the beneficiation of valuable sulfide minerals and coal resources, is usually required to be depressed for floating in flotation practice.
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Semantic Scholar extracted view of "Selective depression of pyrite with chitosan in Pb–Fe sulfide flotation" by Peng Huang et al. ... Chemistry, Environmental Science; Minerals Engineering; ... chitosan polymer was tested as a potential selective green depressant of pyrite in the bulk flotation of galena (PbS) and chalcopyrite (CuFeS2) from ...
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In the present work an intense bibliographic search is developed, with updated information on the microscopic fundamentals that govern the behavior of flotation operations of chalcopyrite, the main copper mineral in nature. In particular, the effect caused by the presence of pyrite, a non-valuable mineral, but challenging for the operation due to its ability to capture a …
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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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theoretical chemistry and computational chemistry, quantum chemistry and molecular simulation have become increasingly powerful tools to study the molecular properties of otation reagents and reagent/mineral interaction. As such, further review is needed on the advances in pyrite depression in these aspects.
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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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Electrolytic flotation, a rather unconventional flotation technique used in effluent treatment, was investigated on pyrite; the process was enhanced by xanthate and also a cationic collector. ... Electrolytic flotation of pyrite. Konstantine A. Kydros, ... Laboratory of General & Inorganic Chemical Technology, Aristotelian University (114), 540 ...
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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 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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With increasing pyrite proportions in copper feeds, higher Py/Cpy ratios are expected, and whether HiCr steel grinding media effectively depresses high-concentration pyrite is a question to be answered. Thus, this work compared the pyrite depression ability of HiCr steel grinding media in the flotation of low- and high-pyrite-concentration feeds.
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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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Pyrite (FeS 2), an earth-abundant natural mineral, has unique electronic and optical properties and is widely used in various fields such as chemical engineering, electronics, metallurgy and energy storage [1], [2].In nature, pyrite is often associated with other sulfide minerals like galena, chalcopyrite, sphalerite and chalcocite [3].Currently, flotation technology …
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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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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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Under acidic conditions, pyrite was hardly depressed, but the depression degree of pyrite flotation increased with the increasing alkalinity. After cyanide-depressed pyrite was treated with PDS, the zeta potential of pyrite positively shifted, demonstrating the adsorption of cyanogen on the pyrite surface was destroyed and the surface potential ...
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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). Potassium amyl xanthate (PAX) and methyl isobutyl carbinol (MIBC) were used as collector and frother, respectively. Chemical species on the pyrite surface were …
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The depression of pyrite in sulfide flotation by two types of polysaccharides, CMC and guar, was investigated using micro-flotation tests, zeta potential measurements and adsorption tests. Environmentally and from an occupational safety standpoint-this would be a better processing option than cyanide.
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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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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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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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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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Gold grains are observed in a variety of forms, such as coarse-liberated native gold grains, and ultra-fine grains associated with sulfide or non-sulfide mineral particles, in the form of solid solution in sulfide minerals, mainly pyrite. In the flotation of gold ores, bulk sulfide mineral flotation is generally applied to maximize gold recovery. This approach gives high gold …
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Abstract The adsorption of both dextrin and xanthate ions at the pyrite/aqueous solution and the galena/aqueous solution interfaces have been studied through batch adsorption tests. Batch flotation tests were also carried out on a chalcopyrite ore and a chalcopyrite-galena scavenger concentrate using dextrin. Dextrin adsorption isotherms on two types of surfaces of …
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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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In the flotation of copper ores, copper sulphides are recovered while unwanted pyrite is depressed (Reyes-Bozo et al., 2014). The previous study revealed that pyrite recovery was significantly elevated when seawater was used in flotation to replace fresh water, making the flotation more difficult to separate chalcopyrite from pyrite, and the enhanced galvanic …
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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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Seawater flotation is a promising technique to reduce environmental and economic loads in mineral processing. This study attempted to depress pyrite, a common gangue sulfide mineral, using two marine iron (Fe) oxidizing bacteria (MFeOB), Thalassospira sp. TF-1 and Mariprofundus sp. E-4, in seawater flotation without pH control; the MFeOB could contribute to …
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Tannic acid causes pyrite depression in flotation pulp containing 100 mg/l of xanthate and 60 mg/L of frother at pH 6.0. This means that TA causes xanthate to desorb from …
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The Surface and Solution Chemistry of Pyrite Flotation with Xanthate in the Presence of Iron Ions. Colloids Surf. A Physicochem. Eng. Asp. 1998;136:51–62. doi: 10.1016/S0927-7757(97)00250-1. [Google Scholar] 107. Mu Y., Peng Y., Lauten R.A. The Depression of Pyrite in Selective Flotation by Different Reagent Systems—A Literature Review. Miner.
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(1992) evaluated a series ofinorganic depressants for pyrite in coal flotation. They reported that the oxidizing agents KMn04 and K2Cr20 7are good pyrite depre ssants. The joint use of CaO and K2Cr207 at pH 7 to 9 gave a superior depression effect for pyrite . In their study. the impact of the dispersing agents on pyrite depression was also ...
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