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v117n5a12 An improved flotation test method and pyrite

metal extraction processes. Pyrite depression is usually reached at highly alkaline conditions An improved flotation test method and pyrite depression by an organic reagent during flotation in seawater by R.I. Jeldres*, D. Calisaya*, and L.A. Cisternas* *59,484 Flotation of copper

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Biodepression of Copper Activated Pyrite with

problem is greater because chalcopyrite oxidizes and releases copper ions that react with pyrite. Because the use of natural seawater is becoming relevant in flotation process, it is necessary to evaluate if bacteria are capable of depressing copper activated pyrite in flotation with seawater. 2. Materials and Methods 2.1. Mineral Preparation

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Selectively Depress Copper Activated Pyrite in Copper

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

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Biodepression of Copper Activated Pyrite with

Acidithiobacillus ferrooxidans has been shown to be a good depressant of pyrite in freshwater and seawater flotation. However, the effect of these bacteria over copper activated pyrite has not been studied. At the industrial scale, the activation of pyrite with copper is a common process that occurs because Cu2+ ions, released from other minerals, react with pyrite.

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Depression of pyrite in seawater flotation by guar gum

The microflotation tests were performed at pH 8, which is the pH at the copper sulfide processing plants that operate with seawater. Pyrite flotation recovery was correlated with FBRM and PVM characterization to delineate the pyrite depression mechanisms by the guar gum.

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Depression of pyrite in porphyry copper flotation

Pyrite in the feed was Cu activated , and adsorbed xanthate even at high pH (10.5), becoming highly floatable pyrite depression was achieved by increasing the pH with lime Na 2SO 3and DETA were effective in preventing/reversing the activation of pyrite in the presence of O2, reducing pyrite recovery by 50%.

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The depression of pyrite in selective flotation by

1/10/2016· Agorhom et al. (2014) studied the depression effect of DETA on the flotation of copper activated pyrite with PAX as collector with or without aeration at pH 10. It was found that DETA depressed the flotation of Cu activated pyrite at high dosages (500 g t 1 ).

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CHAPTER 7 FLOTATION OF SULPHIDE MINERALS

Above pH 11, the surface of pyrite is of ferric hydroxide (Fe(OH) 3), a hydrophilic compound. Calcium ion contributed by lime in pH adjustment also adds to pyrite depression. Flotation is affected about one pH unit lower if CaO is used for raising pH compared with KOH or K 2 CO 3 The pzc for pyrite is at pH = 6.9.

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Physico chemical models for activation, flotation and

Physico chemical models for activation, flotation and depression of pyrite in copper flotation book By A. A. Abramov, G. Önal, Z. Doğan Book Mineral Processing on the Verge of the 21st Century

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A study on the effect of active pyrite on flotation of

Abstract: Active pyrite is one of the most undesirable phenomena in the flotation of porphyry copper ores. Misreported pyrite into copper concentrates decreased the grade and recovery of copper. In this study, the effective parameters on the flotation process including grinding condition and chemical parameters were evaluated in order to

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The depression of pyrite in selective flotation by

Pyrite is a gangue mineral widely associated with valuable minerals. It is problematic to deal with in differential flotation because it easily reports to flotation concentrates. Pyrite may float due to natural or self induced hydrophobicity or collector induced hydrophobicity. Its flotation can also be enhanced by the activation of

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Pyrite depressant useful in flotation separation

17/6/1997· While a vast array of reagents for pyrite depression have been proposed and reported, we are unaware of use of 2 S thiouronium ethane sulfonate (IESA) as a pyrite depressant during both coal and copper sulfide flotation operations, and moreover, we are surprised by the effectiveness thereof in such operations.

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The role of sodium sulfide in the flotation of pyrite

Pyrite Depression Flotation Sodium sulfide Sulfidization Surface oxidation products ABSTRACT In copper gold flotation plants, pyrite which is depressed in copper otation is often oated subsequently with the addition of sodium sulfide (Na 2S) to recover the associated gold. For the first time, this study investigated the role of Na

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Biodepression of Copper Activated Pyrite with

Acidithiobacillus ferrooxidans has been shown to be a good depressant of pyrite in freshwater and seawater flotation. However, the effect of these bacteria over copper activated pyrite has not been studied. At the industrial scale, the activation of pyrite with copper is a common process that occurs because Cu2+ ions, released from other minerals, react with pyrite.

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Optimization of a Copper/Molybdenum Flotation Circuit by

Optimization of a Copper/Molybdenum Flotation Circuit by Depressing Pyrite from the Rougher Flotation Stage Using Different Scheme of Reagents A thesis submitted in partial fulfillment of the requirements for the degree of Master Of Science in Metallurgical Engineering by Wander A. Valderrama Dr. Carl C. Nesbitt/Thesis Advisor May 2020

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Selectively Depress Copper Activated Pyrite in Copper

26/1/2021· 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.

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Electrolytic flotation of pyrite, Journal of Chemical

1/3/1994· So, the interaction of copper with xanthates takes place in solution rather than at the interface, xanthate is consumed and depression of pyrite flotation is observed. At pH values above 7.0 Cu(OH)+ predominate^.^^ This hydroxy complex of copper is adsorbed on the surface of pyrite and interaction with xanthates occurs there as described by eqn (4).

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Biodepression of Copper Activated Pyrite with

anhydrous (CuSO4) with a molecular weight 159.61g/mol was used to activate pyrite with copper. First, 1g of pyrite was contacted with 18.5mL of water and 1mL of CuSO4 solution with a concentration of 0.5 10 3 M or 1 10 3 M for 5min. Subsequently, 0.5mL of bacterial suspension with a concentration of 1.2 1010 bacteria/mL was added

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Pyrite Depression in Copper Flotation

8/10/2015· Pyrite Depression in Copper Flotation. The Pyrite Depression in a Copper Only Flotation circuit is simple enough. If your froth flotation system only tries to recover chalcopyrite copper, you need to bring the plants pH up to the other side (right side) of the PYRITE curve. The more flotation collector you have on, the higher you will need to

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Effect of bacterial conditioning and the flotation of

copper grade increase of about 22% in flotation copper ore through bacterial conditioning of pyrite surfaces resulting in pyrite depression. Key words: Chalcopyrite, bio oxidation, bacteria, mineral surface, froth flotation. INTRODUCTION Acidothiobacillus ferrooxidans is an aerobic, acidophilic, rod shaped, autotrophic, gram negative bacterium.

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(PDF) Selective depression of pyrite with polyacrylamide

Copper activation of pyrite is mainly responsible for the high flotation of this mineral in alkaline pH conditions, while its depression is due to the higher proportion of surface oxidation products inhibiting collector adsorption, orrand a reduced stability of collector such as dixanthogen ŽShen et al., 1998..

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Flotation of sphalerite and pyrite in the presence of

promotes the oxidation of copper on pyrite as copper hydroxide, but has no effect on sphalerite. This increase in the amount of oxidation products on the pyrite surface and, as a result, decrease in xanthate adsorption may explain the depression of the flotation of pyrite in the presence of sodium sulfite. q2001 Elsevier Science B.V.

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Pyrite Depression With Pionera Biopolymers Borregaard

Pyrite Depression Study. In a preliminary laboratory study, we tested Pionera F 255 in a chalcopyrite cleaner flotation with high pyrite (20%) containing ore. The feed for the laboratory flotation cell came directly from the cleaner feed tank in the plant. The cleaner feed had an iron content of about 20%, most of it as pyrite.

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Flotation of sphalerite and pyrite in the presence of

promotes the oxidation of copper on pyrite as copper hydroxide, but has no effect on sphalerite. This increase in the amount of oxidation products on the pyrite surface and, as a result, decrease in xanthate adsorption may explain the depression of the flotation of pyrite in the presence of sodium sulfite. q2001 Elsevier Science B.V.

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Depression of pyrite in seawater flotation by guar gum

The microflotation tests were performed at pH 8, which is the pH at the copper sulfide processing plants that operate with seawater. Pyrite flotation recovery was correlated with FBRM and PVM characterization to delineate the pyrite depression mechanisms by the guar gum.

Chat

Depression of pyrite in porphyry copper flotation

Pyrite in the feed was Cu activated , and adsorbed xanthate even at high pH (10.5), becoming highly floatable pyrite depression was achieved by increasing the pH with lime Na 2SO 3and DETA were effective in preventing/reversing the activation of pyrite in the presence of O2, reducing pyrite recovery by 50%.

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