Electrochemical reactions of pyrite in acid perchlorate solutions

Peters, E.; Majima, Hiroshi

doi:10.1179/cmq.1968.7.3.111

Cited by 100 publications

(27 citation statements)

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“…The choice of perchlorate as an eluant has the following advantages: 44,[51][52][53] . Perchlorate is stable, and does not form a complex with metallic species.…”

Section: Selection Of Gold Eluantmentioning

confidence: 99%

Gold Recovery from Nickel Catalyzed Ammonium Thiosulfate Solution by Strongly Basic Anion Exchange Resin

2003

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Copper catalyzed ammonium thiosulfate leaching process has been proposed as an alternative gold extraction process to cyanidation. In order to recover gold from the ammonium thiosulfate solution, ion exchange process has been proposed as a gold recovery method using strongly basic anion exchange resin. However, the co-adsorption of copper along with gold causes difficulty in separating gold and copper at the gold elution stage. Our previous study has demonstrated that nickel catalyzed ammonium thiosulfate solution for gold extraction has the advantage of reducing thiosulfate consumption. In this study, the results also demonstrated the advantage of gold recovery from the nickel catalyzed ammonium thiosulfate solution by strongly basic anion exchange resin. The optimal gold loading conditions on a 1 g/dm 3 strongly base anion exchange resin (wet base value) are investigated in several ion concentrations and 95 kg-Au/t-resin has been obtained. The alternative gold eluant was investigated as the gold loaded resin cannot be eluted by conventional hydrochloric acid. Results showed that the elution efficiency was in the order of OHThe maximum gold recovery by using 2.5 mol/dm 3 ClO 4 À was around 98% with the stripped resin assayed as 0.2 kg/t Au. The feasibility of resin recycling has demonstrated that there was no deterioration in gold adsorption and desorption for four cycles.

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“…The choice of perchlorate as an eluant has the following advantages: 44,[51][52][53] . Perchlorate is stable, and does not form a complex with metallic species.…”

Section: Selection Of Gold Eluantmentioning

confidence: 99%

Gold Recovery from Nickel Catalyzed Ammonium Thiosulfate Solution by Strongly Basic Anion Exchange Resin

2003

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“…Pyrite is widely recognized as an electronic conductor and its oxidation has been described by the metal corrosion model for many years (Peters and Majima, 1968;Biegler and Swift, 1979;Peters, 1992). Some earlier studies (Springer, 1970;Biegler, 1975;Biegler and Swift, 1979) showed that n-and p-type pyrite exhibited very similar anodic and cathodic polarization curves under acidic conditions.…”

Section: Introductionmentioning

confidence: 99%

“…The conventional approach to the pyrite/aqueous interfacial studies is based on the use of a bulk pyrite specimen as an electrode for conducting electrochemical measurements (Peters and Majima, 1968;Woods, 1976;Mishra and Osseo-Asare, 1988a;Richardson et al, 1992). Because of the resulting small area of the pyrite/solution interface and the slow specific reaction rate, the response of the electrochemical reaction at the interface may not be strong enough to be detected and presented clearly by a given analytical instrument.…”

Section: Pyrite Aqueous Systemsmentioning

confidence: 99%

“…The conventional approach to pyrite electrochemistry is based on the metal electrode model (Peters and Majima, 1968;Biegler and Swift, 1979;Peters, 1992). Pyrite is treated as an electronic conductor and its oxidation is thought to proceed only through electron transfer.…”

Section: Pyrite Aqueous Systemsmentioning

confidence: 99%

“…The conventional approach to pyrite/aqueous interfacial studies is based on the use of bulk natural or synthetic pyrite specimens, i.e., planar electrodes (Peters and Majima, 1968;Woods, 1976;Mishra and Osseo-Asare, 1988a,b;Richardson et al, 1992) or relatively large particles with a size range from 106 to 125 pm (Lalvani and Shami, 1986) or 106 to 150 pm (Ciminelli and Osseo-Asare, 1995). Because of the resulting limited area of the pyrite/solution interface, the response of electrochemical reaction at the interface may not be strong enough to be detected and characterized clearly by a given analytical instrument.…”

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confidence: 99%

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Semiconductor electrochemistry of coal pyrite. Final technical report, September 1990--September 1995

Osseo-Asare¹,

Wei²

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Acid rock drainage formation and treatment: a review

Egiebor

Oni

2007

Asia-Pacific J Chem Eng

110

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The exploitation of coal and metallic mineral resources worldwide invariably results in the production of large quantities of overburden, gangue, and tailings materials containing significant amounts of sulfide minerals. These sulfide minerals, which include sphalerite, chalcopyrite, galena, and other complex sulfides, are often disseminated in pyrite, which is the most abundant sulfide mineral in the earth's crust. Once exposed to water and oxygen through mining and mineral processing operations, these sulfides become immediately susceptible to chemical and biochemical oxidation with the consequent production of highly acidic, metal‐laden leachates, which are generally referred to as acid rock drainage (ARD) or acid mine drainage (AMD). This ARD production, which can be sustained for hundreds of years, has become the single biggest environmental problem facing the mining and mineral industry. Untreated acid rock drainage leads to serious contamination of large areas of land, as well as surface and ground water resources. The seriousness of the problem has led to major research efforts to find solutions. However, effective ARD treatment and prevention solutions have eluded the scientific community over the past decades. This paper presents a detailed review of the current state of scientific knowledge with regard to the magnitude of the problem, the chemistry and mechanism of sulfide mineral oxidation and ARD formation, the role of microorganisms in ARD formation process, and the proposed approaches for the treatment, control, and prevention of ARD formation. Copyright © 2007 Curtin University of Technology and John Wiley & Sons, Ltd.

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Electrochemical reactions of pyrite in acid perchlorate solutions

Cited by 100 publications

References 1 publication

Gold Recovery from Nickel Catalyzed Ammonium Thiosulfate Solution by Strongly Basic Anion Exchange Resin

Gold Recovery from Nickel Catalyzed Ammonium Thiosulfate Solution by Strongly Basic Anion Exchange Resin

Semiconductor electrochemistry of coal pyrite. Final technical report, September 1990--September 1995

Acid rock drainage formation and treatment: a review

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