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Xanthate adsorbs on pyrite surface at mildly acidic pH, rendering mineral surface hydrophobic. By far, the electrochemical behavior of pyrite exposed to cyanide‐bearing solution has been reported in alkaline media. The impact of cyanide on the chemisorption of xanthate on pyrite in mildly acidic media is unclear. The present study clearly pictured the interfacial processes in pyrite ...
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Correlation between copper-activated pyrite flotation and surface species: Effect of pulp oxidation potential . × ... Surface modifications in the chalcopyrite-sulphite ion system. I. collectorless flotation, XPS and dissolution study. By William Skinner. Sulphide mineral flotation : a new insight into oxidation mechanisms ...
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Microflotation tests, electrokinetic and electrochemical measurements were carried out to investigate the flotation behavior of pyrite samples taken from different regions of Turkey. Chemical analyses and mineralogical examinations showed that these pyrite samples have different impurities and structural properties. The flotation characteristics of pyrites using ethyl xanthate were similar ...
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Aspects 136 (1998) 51-62 flotation of pyrite, and reported that when low concentrations of xanthates were used, in spite of the nature of xanthate species added (xanthate or dixanthogen), a high or complete recovery in the acidic region, a partial recovery under mildly alkaline solution, and an intermediate depression or low recovery region in ...
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ability toward chalcopyrite than sodium isobutyl xanthate and O-isopropyl-N-ethylthionocarbamate. Moreover, BIBX displays superior selectivity for chalcopyrite compared to pyrite. The adsorption data indicate that BIBX can be applied under slightly acidic or alkaline conditions. BIBX behaves like a bidentate ligand, bonding with the
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However, the correlation between pyrite surface oxidation, xanthate adsorption and its flotation response has not been clearly established. The complexity lies in various intermediate sulfur oxidation products in different solution conditions. Thus, investigation of sulfur oxidation behavior is the key to understand pyrite oxidation.
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Pyrite,pyrrhotite and arsenopyrite are sulphide minerals which bear iron in their structures and are collected in flotation plants by thio-compounds, for example: xanthates, dithiophosphates, mercaptans, mercaptobenzothiazolea Selective flotation among iron bearing minerals is always difficult to be achieved.The present flotation state-of-art
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Pyrite flotation with xanthate under alkaline conditions-application to environmental desulfurization. Proceedings of the Centenary of Flotation Symposium, Brisbane, Queensland, 6-9 June 2005. Australasian Institute of Mining and Metallurgy, Melbourne. pp. 683-692. Links ] Monardes, A. 2009. ...
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Wang and Forssberg reported that Fe(CN) 6 4− and Fe(CN) 6 3− are the main products in the Fe-CN-Xanthate-H 2 O system under neutral to alkaline conditions; as such, the reactivity between xanthate and passivated pyrite might be reduced due to the passivation effect of Fe(CN) n m− on pyrite (Guo et al. 2016).
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The selective action mechanism of sodium butyl xanthate (BX), ammonium salt (NH4+), and sodium m-nitrobenzoate (m-NBO) on pyrite and arsenopyrite was examined by experiments and quantum chemistry. The experiments show that under alkaline conditions, ammonium salt (NH4+) and m-NBO can have a strong inhibitory effect on arsenopyrite. At pH 11, the recovery rate of arsenopyrite reduces to 16% ...
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Charge screening and adsorption capacity of monovalent ions onto pyrite (Py) in aqueous suspensions and the effect of potassium amyl xanthate (PAX) has been studied by measuring the changes in zeta potential (zp) versus pH with streaming potential. PAX addition in the absence of salts leads to an increase in |zp| suggesting dissolution of the surface ferric hydroxides and recovery of bare Py ...
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pyrite flotation induced by xanthate using X-ray spectroscopy (XPS) under aerated and non-aerated conditions. The study showed that DETA is more effective for pyrite depression than SMBS on an individual basis; however, high dosages of DETA (500 g/t) are required. Oxidation (aeration of the flotation pulp) of Cu-activated pyrite induced by ...
Get priceHowever, talc still does not adsorb the collector xanthate after the flotation agent is assembled between molecules. Figure 6. The adsorption amount of PAX (a) and guar gum (b) on talc and pyrite surfaces as a function of PAX and guar gum. PAX and guar gum exist simultaneously. ... Under alkaline conditions, pyrite is more effective than talc.
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The mechanism for xanthate flotation of pyrite has been considered extensively ' 5~zo. Recently, Fuerstenau showed that the oxidation product, dixanthogen, is the species responsible for pyrite flotation when xanthate is used as the collector. ... The minimum price of alkaline sulfites is 4 cents a pound, while the price of sodium cyanide is 28 ...
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crushinggrinding crushinggrinding and flotation of nickel. Destroy Grinding And Flotation Of Nickel. Iron ore crushing plant nickel crush grinding plant. There is an overlapping s
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the flotation of pyrite, while the decrease in recovery under alkaline conditions may be related to the formation of iron hydroxide species or lack of dixanthogen on the surface. As shown in Fig. 3(b), flotation behaviour of ... chalcopyrite may be floated by either of metal xanthate or dixanthogen but pyrite can only be floated by
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This work provides valuable implications for understanding the correlation of surface oxidation, xanthate adsorption and its floatation behavior to mediate pyrite flotation. 2. Materials and methods 2.1. Materials Highly pure pyrite samples were obtained from Banlao Mine (Gengma, Yunnan Province, China).
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flotation experiment reach optimal quantity at pH=12 in the Sodium hydroxide system. Butyl xanthate as collector in Sulfuric acid and natural pH system In the Fig. 3(f), considering the butyl xanthate has a good flotation performance under the weak acidic conditions, it is necessary to add a set of tests which study the recovery of Cu and Mo in
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Citer ce document: Noirant, G. (2019). Caractérisation de la pyrite dans les conditions de désulfuration environnementale à l'aide du xanthate et de collecteurs alternatifs (Mémoire de maîtrise, Polytechnique Montréal). Tiré de https://publications.polymtl.ca/3803/
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The effects of H2O2 on the flotation separation of chalcopyrite and pyrite in seawater were investigated. Pyrite was more significantly oxidized by 0.05 vol% H2O2 in seawater at pH 8, as compared to that of chalcopyrite. Under optimized condition, a recovery difference of greater than 70% was obtained for chalcopyrite and pyrite. The contact angle measurements showed that pyrite surface was ...
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The type of collector had greater effect on the chalcopyrite flotation than the other parameters. The recovery and grade of chalcopyrite and pyrite were obtained as 79.95%, 49% and 5.3%, 7.98% using the Aero 407, respectively. Under the optimum conditions, the grade of final concentrate increased from 0.94% to 21.3% with three cleaner stages.
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Dextrin as a non-toxic depressant for pyrite in flotation with xanthates as collector. Minerals Engineering, 2004. A. López-Valdivieso. Download Download ... Flotation and depression control of arsenopyrite through pH and pulp redox potential using xanthate as the collector. By Alejandro López-Valdivieso. Handbook of Flotation Reagents ...
Get priceThe U.S. Department of Energy's Office of Scientific and Technical Information
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In this study, we investigated the localized and concomitant precipitation of calcium (Ca)/magnesium (Mg)-bearing species and iron oxides/oxyhydroxides, and their depression characteristics to the pyrite floatability in flotation process at pH 9 and pH 10.5 with prolonged pre-oxidation. Contrary to the depression characteristics at pH 9, the incipient (within aeration times of 30 min ...
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The adsorption of Cu species onto pyrite surface and its effect on flotation were investigated by using microflotation tests, first-principle calculations, and XPS surface analysis. The results indicated that the flotation of pyrite appears to be activated with CuSO4 only at alkaline pH, while being depressed at acidic and neutral pH. The adsorption of copper ions on pyrite surface ...
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flotation tests showed that calcium hypochlorite (Ca(ClO) 2) had a stronger depression effect on pyrite pre-adsorbed sodium butyl xanthate (SBX), while having a negligible depressive effect on chalcopyrite. A copper concentrate with Cu grade of 33.32% and Cu recovery of 94.47% could be obtained from flotation tests of mixed minerals.
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In alkaline environments, Mine-float 070 is useful for the flotation of copper, silver, gold, lead and zinc sulphides, as in general it does not float pyrite at high pH. Many operators have found that Mine-float 070 together with an alkyl dithiophosphate or a xanthate are the best combinations for optimum grade and recovery.
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One explanation for the high flotation of pyrite in alkaline pH conditions is its inadvertent activation by copper either dissolved from copper minerals present in the ore or added in the zinc circuit to activate the flotation of sphalerite Bushell and Krauss, 1962; Voigt et al., 1994.. ... Woods, R., Wouterlood, H.J., 1989. An XPS ...
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Ester-105: It has selectivity and foaming property to reduce the cost of reagents and improve the mineral processing index. DMDC: It has a strong collection capacity for copper and a weak collection capacity for pyrite and unactivated sphalerite. It can be used for copper and sulfur separation and its flotation index is higher than butyl xanthate.
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A 74‐year‐old man experienced complete atrioventricular (AV) block 2 days after catheter ablation for right atrial (RA) macroreentrant tachycardia.
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The hydrocarboxycarbonyl thiourea collectors and the process of the present invention unexpectedly provide superior metallurgical recovery in froth flotation separations as compared with conventional sulfide collectors, even at reduced collector dosages, and are effective under conditions of acid, neutral or mildly alkaline pH.
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Copper ore in Hubei contains 0.67%copper and .012%molybdenum.The high-alkaline copper-molybdenum mixed flotation process was used on site which caused problems such as high lime consumption and difficult wastewater treatment.Through the use of combined collectors and adjustment of ore slurry potential,under the conditions of lime and calcium ...
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Since sphalerite flotation is mostly operated under alkaline ... the activation of pyrite by copper will be studied under flotation related conditions. 1.2. Literature Review ... Although copper sulfate has been used as an activator many years befo re xanthate were adopted to flotation, it is believed that copper activation of sphalerite was ...
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minus 0.044 mm 95% under a microscope Polan 312. Flotation tests were carried out on the mechanical laboratory flotation machine 240FL. They used a collector (butyl potassium xanthate) and a foaming agent (floatation oilT-92). The concept includes a main flotation, flotation control, two recleaning main operations of concentrate flotation. The
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For both pyrite and arsenopyrite, high flotation recoveries are achieved under acidic pH conditions proposed to be as a result of elemental sulphur as well as a high ratio of dixanthogen to surface oxidation product (Choi et al., 2013; Guongming and Hongen, 1989; Park et al., 2015; Zhang and Zhang, 2014) . Conversely, a
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A case study reporting synergistic interactions between thiol collectors in the flotation of pyrite at pH = 4 is included. The use of Potassium n-butyl xanthate (PNBX) and a dithiocarbamate type collector (DTC) were tested both as pure collectors and as components in a collector mixture.
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Oct 01, 2016· A study conducted by Mu et al. (2014) demonstrated that three lignosulfonate-based biopolymers (DP-1775, DP-1777 and DP-1778) differing in molecular weight and polymer chemistry depressed the flotation of un-activated pyrite (at pH 5), copper-activated pyrite (at pH 9) and chalcopyrite (at pH 9).
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Xanthate such drugs include xanthate, xanthate, etc. Sulfur and nitrogen, such as ethyl sulfide, have stronger collecting ability than xanthate. It has strong ability to collect lead ore and chalcopyrite, weaker ability to collect pyrite, good selectivity, faster flotation speed, and less use than xanthate.
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Tests covered the frothless flotation of pyrite under different concentrations of depressants at various solution pH's with potassium butyl xanthate (KBX) as collector. Flotation test results have shown that NaCN, and even more the combination of reagents FeSO4/NaCN are more successful in pyrite depression than complex cyanide salts, such as ...
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Pyrite Flotation With Xanthate Under Alkaline Conditions — Application to Environmental Desulfurisation R. Mermillod-Blondin, M. Kongolo, +4 authors M. Aubertin Materials Science 2005 The extensive literature on sulfide flotation indicates that pyrite poorly floats under alkaline condition.
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