Studies on the effect of addition of silver ions on the direct oxidation of pyrite

J Brent Hiskey, P. P. Phule, M. D. Pritzker

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

The nature of the reaction between Ag+ and pyrite in 0.25 M H2SO4 solutions has been investigated in order to determine whether Ag+ can enhance the ferric sulfate leaching of this mineral. Analysis of reacted pyrite particles using scanning electron microscopy, X-ray photoelectron spectroscopy (XPS), and low-angle X-ray diffraction (XRD) indicates that elemental silver and elemental sulfur are the primary surface species formed by this interaction. Rest potential measurements of a pyrite electrode immersed in a solution containing 10-2 M Ag+ are also consistent with what is expected for the deposition of metallic silver. Furthermore, the XRD data reveal that, at the most, only minor amounts of Ag2S are being produced. The presence of Ag2O has also been detected, but this is due to oxidation of silver after the experiment is complete and while the particles are being transferred for surface analysis. When 1 M ferric sulfate is contacted with pyrite which has been pretreated in a AgNO3 solution, most of the silver immediately redissolves and does not redeposit while ferric ions are present. This indicates that the kinetics of the transfer reaction between Ag+ and pyrite is slower than the reaction between Fe3+ and pyrite and suggests that Ag+ does not likely enhance the ferric sulfate leaching.

Original languageEnglish (US)
Pages (from-to)641-647
Number of pages7
JournalMetallurgical Transactions B
Volume18
Issue number4
DOIs
StatePublished - Dec 1987

Fingerprint

Pyrites
pyrites
Silver
silver
Ions
Oxidation
oxidation
sulfates
ions
leaching
Leaching
ferric ions
X ray diffraction
x rays
Surface analysis
diffraction
Sulfur
Minerals
pyrite
sulfur

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Metals and Alloys
  • Materials Chemistry
  • Mechanics of Materials

Cite this

Studies on the effect of addition of silver ions on the direct oxidation of pyrite. / Hiskey, J Brent; Phule, P. P.; Pritzker, M. D.

In: Metallurgical Transactions B, Vol. 18, No. 4, 12.1987, p. 641-647.

Research output: Contribution to journalArticle

@article{657235eabcbc44ec908e565d7eb07ab8,
title = "Studies on the effect of addition of silver ions on the direct oxidation of pyrite",
abstract = "The nature of the reaction between Ag+ and pyrite in 0.25 M H2SO4 solutions has been investigated in order to determine whether Ag+ can enhance the ferric sulfate leaching of this mineral. Analysis of reacted pyrite particles using scanning electron microscopy, X-ray photoelectron spectroscopy (XPS), and low-angle X-ray diffraction (XRD) indicates that elemental silver and elemental sulfur are the primary surface species formed by this interaction. Rest potential measurements of a pyrite electrode immersed in a solution containing 10-2 M Ag+ are also consistent with what is expected for the deposition of metallic silver. Furthermore, the XRD data reveal that, at the most, only minor amounts of Ag2S are being produced. The presence of Ag2O has also been detected, but this is due to oxidation of silver after the experiment is complete and while the particles are being transferred for surface analysis. When 1 M ferric sulfate is contacted with pyrite which has been pretreated in a AgNO3 solution, most of the silver immediately redissolves and does not redeposit while ferric ions are present. This indicates that the kinetics of the transfer reaction between Ag+ and pyrite is slower than the reaction between Fe3+ and pyrite and suggests that Ag+ does not likely enhance the ferric sulfate leaching.",
author = "Hiskey, {J Brent} and Phule, {P. P.} and Pritzker, {M. D.}",
year = "1987",
month = "12",
doi = "10.1007/BF02672880",
language = "English (US)",
volume = "18",
pages = "641--647",
journal = "Metallurgical and Materials Transactions B",
issn = "1073-5615",
publisher = "Springer International Publishing AG",
number = "4",

}

TY - JOUR

T1 - Studies on the effect of addition of silver ions on the direct oxidation of pyrite

AU - Hiskey, J Brent

AU - Phule, P. P.

AU - Pritzker, M. D.

PY - 1987/12

Y1 - 1987/12

N2 - The nature of the reaction between Ag+ and pyrite in 0.25 M H2SO4 solutions has been investigated in order to determine whether Ag+ can enhance the ferric sulfate leaching of this mineral. Analysis of reacted pyrite particles using scanning electron microscopy, X-ray photoelectron spectroscopy (XPS), and low-angle X-ray diffraction (XRD) indicates that elemental silver and elemental sulfur are the primary surface species formed by this interaction. Rest potential measurements of a pyrite electrode immersed in a solution containing 10-2 M Ag+ are also consistent with what is expected for the deposition of metallic silver. Furthermore, the XRD data reveal that, at the most, only minor amounts of Ag2S are being produced. The presence of Ag2O has also been detected, but this is due to oxidation of silver after the experiment is complete and while the particles are being transferred for surface analysis. When 1 M ferric sulfate is contacted with pyrite which has been pretreated in a AgNO3 solution, most of the silver immediately redissolves and does not redeposit while ferric ions are present. This indicates that the kinetics of the transfer reaction between Ag+ and pyrite is slower than the reaction between Fe3+ and pyrite and suggests that Ag+ does not likely enhance the ferric sulfate leaching.

AB - The nature of the reaction between Ag+ and pyrite in 0.25 M H2SO4 solutions has been investigated in order to determine whether Ag+ can enhance the ferric sulfate leaching of this mineral. Analysis of reacted pyrite particles using scanning electron microscopy, X-ray photoelectron spectroscopy (XPS), and low-angle X-ray diffraction (XRD) indicates that elemental silver and elemental sulfur are the primary surface species formed by this interaction. Rest potential measurements of a pyrite electrode immersed in a solution containing 10-2 M Ag+ are also consistent with what is expected for the deposition of metallic silver. Furthermore, the XRD data reveal that, at the most, only minor amounts of Ag2S are being produced. The presence of Ag2O has also been detected, but this is due to oxidation of silver after the experiment is complete and while the particles are being transferred for surface analysis. When 1 M ferric sulfate is contacted with pyrite which has been pretreated in a AgNO3 solution, most of the silver immediately redissolves and does not redeposit while ferric ions are present. This indicates that the kinetics of the transfer reaction between Ag+ and pyrite is slower than the reaction between Fe3+ and pyrite and suggests that Ag+ does not likely enhance the ferric sulfate leaching.

UR - http://www.scopus.com/inward/record.url?scp=51249170886&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=51249170886&partnerID=8YFLogxK

U2 - 10.1007/BF02672880

DO - 10.1007/BF02672880

M3 - Article

VL - 18

SP - 641

EP - 647

JO - Metallurgical and Materials Transactions B

JF - Metallurgical and Materials Transactions B

SN - 1073-5615

IS - 4

ER -