An electrochemical investigation of pyrite flotation and depression

Janetski, N.D.; Woodburn, S.I.; Woods, R.

doi:10.1016/0301-7516(77)90004-7

Cited by 118 publications

(42 citation statements)

References 11 publications

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“…These observations regarding an increase in pyrite oxidation with pH have also been reported by other authors [17,18]. In addition, the increased carbonate ion concentration in the alkaline region could further accelerate the oxidation process via the formation of Fecarbonate complexes [19,20].…”

Section: Effects Of Ph and Dissolved Oxygen (Do) On As And Pb Leachingsupporting

confidence: 87%

Mechanisms of arsenic and lead release from hydrothermally altered rock

Tabelin

Igarashi

2009

Journal of Hazardous Materials

117

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This paper describes the effects of pH, dissolved oxygen (DO), redox conditions, and mixing ratio of different rocks on the leaching behaviors of As and Pb from hydrothermally altered rock as well as the functional groups incorporating As and Pb in the rock. Most of As and Pb were incorporated in the residual or crystalline phase although significant amounts were also determined to be exchangeable, with carbonates and with FeMn oxides. Under oxic conditions, As and Pb showed similar leaching behaviors at similar pH values, a higher mobilization in the acidic and alkaline regions and a minimum at circumneutral pH. The absence of DO restricted the oxidation of sulfide minerals that also contained significant quantities of As resulting in a lower As release under these conditions. Strongly reducing conditions favored the release of As by the reductive dissolution of FeMn oxides and prevention of carbonate precipitation while the same conditions immobilized Pb because of its re-precipitation under reducing conditions. In general, depending on the pH, DO, and redox conditions, the major modes of As and Pb release from these sources could be either one or more of the following mechanisms: acid dissolution, reductive dissolution, ion exchange, desorption and sulfide oxidation processes.

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Section: Effects Of Ph and Dissolved Oxygen (Do) On As And Pb Leachingsupporting

confidence: 87%

Mechanisms of arsenic and lead release from hydrothermally altered rock

Tabelin

Igarashi

2009

Journal of Hazardous Materials

117

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“…Pyrite (FeS 2 ), a common constituent of base metal ore deposits, is widely associated with other base metal sulfide minerals (e.g., chalcopyrite) and precious minerals (e.g., gold) [1][2][3][4][5]. It is usually perceived as a gangue mineral and removed from valuable minerals by flotation which exploits the difference in surface properties [6,7].…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, the flotation and depression of this mineral is of great significance. Alkyl xanthates, known to selectively interact with sulfides and render their surfaces hydrophobic, are the most extensively used collectors in the flotation of base metal sulfide minerals [3,4]. Pyrite responds strongly with xanthates (X À ) in acidic to neutral pH conditions and it is generally acknowledged that dixanthogen (X 2 , oxidation product of xanthate ions) is the main product responsible for pyrite flotation [3,8].…”

Section: Introductionmentioning

confidence: 99%

Electrochemistry aspects of pyrite in the presence of potassium amyl xanthate and a lignosulfonate-based biopolymer depressant

Peng

Lauten³

2015

Electrochimica Acta

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“…Janetski et al (18) and Hamilton and Woods (19) observed current peaks on cyclic voltammograms of pyrite electrodes in basic solutions and assigned them to the Fe(OH) 2 /Fe(OH) 3 redox couple. Michell and Woods (20) analyzed the surface of pyrite by X-ray emission spectroscopy, after oxidizing the surface electrochemically in pH 9.2 buffer solution.…”

Section: Introductionmentioning

confidence: 99%