The solution pH of single bornite substantially increased from 1.7 to 4.6 in the first 11 days, after that pH maintained at approximate 4.6. Conversely, the solution pH of single pyrite decreased continuously. Trends of pH suggested that the dissolution of bornite was an acid consuming process, while the dissolution of pyrite was an acid ...Web
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148 ii. Surface colloid and reagent chemistry which determines selectivity of separation (collectors, frothers, Process …Web
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Figure 14: Collectorless flotation of pyrite in the presence of Cu2+ ions (pH 9.2, flotation time - 5 min). [15]. ..... 28 Figure 15: Effect of atmosphere (grinding, flotation) on chalcopyrite floatability after grindingWeb
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Although flotation studies of bornite under oxidation treatment are spares in the literature, bornite oxidation is much faster than chalcopyrite but slower than that enargite and tennantite (Acres ...Web
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The effect of iron ions in backwater on the flotation of diaspore bauxite was investigated by ICP measurement, micro-flotation tests, zeta potential measurements and solution chemistry analyses.Web
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Just prior to use, 1 g of chalcopyrite was ground in a small amount of "pretreated" water with a ceramic mortar and pestle. The mineral dispersion was then transferred into a water-jacketed, closed reaction vessel and conditioned at 21±0.2°C for 20 min. in 0.5 dm 3 of a 0.01 mol dm −3 KCl solution in the presence of nitrogen or oxygen …Web
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This study considers bornite and chalcocite mi- croflotation, adsorption studies and zeta potential measurements, and three key factors were ex- plored: pH, galvanic interactions …Web
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that make the flotation process more difficult. The diameter of the characteristic minerals – chalcosine, covellin, bornite in the copper sulfide ore varies: 0.2 mm for chalcosine and to 0.03 µm for bornite. The chalcocite inclusions have equigranular structure [1]. Theoretical substantiations and experimentally confirmed optimal conditions forWeb
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Flotation Results. Figure 2 shows the effect of grinding fineness on recovery rate of copper. It is observed that a rise of the proportion of the grinding fineness of −0.074 mm from 60 to 80% obviously increased the copper recovery, then decreased when it exceeded 80%. This is because the initial appearance was dissociation fragmentation ...Web
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The effect of flotation operational parameters on froth stability and froth recovery was studied. Froth stability was measured using a special column. To determine the froth recovery, the froth height change model and froth …Web
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Effect of oxidation treatment using hydrogen peroxide (H 2 O 2) on the floatability of copper sulfide minerals (i.e., chalcopyrite and bornite) and arsenic-bearing copper minerals (i.e., tennantite and enargite) is reported in this study.Pure mineral flotation shows that the floatability of each mineral significantly decreases after the oxidation …Web
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The copper ore in Chilean copper porphyry deposits is often associated with molybdenum minerals. This copper–molybdenum (Cu–Mo) sulfide ore is generally mined from various locations in the mining site; thus, the mineral composition, oxidation degree, mineral particle size, and grade vary. Therefore, in the mining operation, it is common to …Web
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The wettability and floatability of oxidized chalcocite, bornite, and chalcopyrite with the conditions of sodium hydrosulfide (NaHS) dosages and pHs were studied by contact angle measurements, and single and mixture mineral flotation tests. To evaluate the results of the flotation, the flotation kinetic model for copper sulfide …Web
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Effect of pH on Flotation pH control can be used to selectively float specific ores in a mineral mixture. This may be of particular importance in complex separations such as in the case of bornite andWeb
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Porphyry copper deposits are important sources of copper and typically processed by flotation to produce copper concentrates. As mining areas become deeper, the amounts of impurities, such as sphalerite, can be increased in copper ores, so the appropriate depression of sphalerite floatability should be achieved to obtain saleable copper …Web
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In this paper, the effect of sodium butyl xanthate (NaBX) adsorption on the surface of bornite at different pH on flotation was studied by adsorption kinetic and thermodynamic. The flotation results demonstrated that the recovery was the highest when pH was 9 in NaBX solution (4×10−5 mol/L). The adsorption kinetics showed the reaction …Web
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The solution chemical analysis and micro-flotation experiments indicated that the Cu 2+ ions have produced copper hydroxide (Cu(OH) 2) precipitation under …Web
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The adsorption of the flotation collector O-isopropyl-N-ethyl thionocarbamate on air-exposed Cu metal, cuprite, chalcocite, covellite, cubanite, chalcopyrite, bornite and pyrite at pH ∼6 has ...Web
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The interaction of grinding media and collector in pyrite flotation at alkaline pH. Yufan Mu, Yupu Cheng, Yongjun Peng. ... The critical degree of bornite surface oxidation in flotation. Tiisetso Moimane, Yangyang Huai, Yongjun Peng ... select article Fundamental and flotation techniques assessing the effect of water quality on bubble …Web
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In this paper, the effect of sodium butyl xanthate (NaBX) adsorption on the surface of bornite at different pH on flotation was studied by adsorption kinetic and …Web
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Effect of oxidation treatment using hydrogen peroxide (H 2 O 2) on the floatability of copper sulfide minerals (i.e., chalcopyrite and bornite) and arsenic-bearing copper minerals (i.e., tennantite and enargite) is reported in this study. Pure mineral flotation shows that the floatability of each mineral significantly decreases after the ...Web
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The major sulphide minerals were chalcopyrite, sphalerite, pyrite, chalcocite and bornite. The liberation size for flotation feed was 80% passing 38 μm. In addition to the existing condition, two more sampling surveys were performed at steady-state condition around the Zn rougher bank in a Cu–Zn flotation plant at two different collector ...Web
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1.1. Effect of pH on Flotation pH control can be used to selectively float specific ores in a mineral mixture. This may be of particular importance in complex separations such as in the case of bornite and chalcocite. This is due to the ore itself either exhibiting alkaline or acidic properties, whichWeb
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Fig. 2 shows chalcopyrite flotation recovery in the pure water, sea water and 0.05 M MgCl 2 solutions at pH 10. The cumulative recovery was approximately 70% in pure water after 10 min, indicating a good natural floatability of chalcopyrite. An apparently lower chalcopyrite recovery of 58% was observed in sea water, especially in the initial stage, …Web
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When considering Table 3, it is clear that the majority of conditions used in this study would promote the flotation of chalcocite as shown by the ratios being less than one in most cases. pH 5 in DIW shows a particularly high preference for bornite flotation, while pH 3 in DIW and pH 7 in SPW show a higher preference for chalcocite flotation ...Web
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In the flotation process a number of physicochemical variables are important. According to- [6], the important physico-chemical variables in flotation are: i. Role of mineral/water interface. ii. Surface charge on the minerals. iii. Effect of hydrocarbon length of the collector. iv. Effect of neutral molecules. v.Web
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The Hallimond flotation results presented in Figure 6 confirm that it is possible to float the sulfides at the natural pH region, since the recovery of chalcopyrite is highest at pH 7, and that of chalcocite and bornite at pH 8. It is also notable that while the recovery of chalcocite and bornite is very low at acidic pH, recovery of ...Web
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The four flotation concentrates were combined and reground in a rod mill with stainless steel grinding media. The total weight of grinding media was about 10.3 kg.Particle size P 80 = 20 μm was achieved by adjusting the grinding time. The size distribution was determined by Laser Diffraction with a Malvern MasterSizer (Malvern Instrument Ltd., …Web
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During bornite (bio)leaching, the relationship between the production of intermediate products and redox potential is unknown. In this study, a series of electrochemical tests and surface analytical methods were adopted to investigate the electrochemical dissolution of natural bornite and the formation of the sulfur species on …Web
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Interactions between chalcopyrite and bornite during bioleaching by moderately thermophilic bacteria were investigated mainly by X-ray diffraction, scanning electron microscopy, and electrochemical measurements performed in conjunction with bioleaching experiments. The results showed that a synergistic effect existed between …Web
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This study considers bornite and chalcocite microflotation, adsorption studies and zeta potential measurements, and three key factors were explored: pH, …Web
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Abstract Beneficiation of sulphide ores by flotation is ascribed to the natural electrochemical activity associated with sulphide minerals. Flotation is an …Web
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The Importance of pH in Flotation In flotation, pH control is a vital method to control selective mineral separation. A standard …Web
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The process is commonly carried out in alkaline pH adjusted with lime to depress pyrite, but in seawater depressing effect of Ca ions on molybdenite flotation is augmented, and different pyrite ...Web
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The flotation is optimum in the narrow pH range of 5.5 to 6, falls sharply at pH 5, and is moderate in the pH range 7 to 11, Infrared spectra indicate that copper …Web
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Emirhan Kiraz. The aim of this study was the recovery of copper from the oxide copper ore by froth flotation and agitating sulphuric acid (H2SO4) leaching. The ore with 4.21% copper grade used in ...Web
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An increase in degree of bornite surface oxidation to a magnitude of 7.48, induced by a H 2 O 2 concentration of 2 wt%, led to a dramatic decline in flotation …Web
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