Electrochemical spectral induced polarization modeling of artificial sulfide-sand mixtures

Edmundo Placencia-Gómez, Lee Slater

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

We examined the sensitivity of the electrochemical spectral induced polarization (SIP) model developed by Wong to the oxidation extent of pyrite and pyrrhotite minerals disseminated in silica sand. The sensitivity of this model to the oxidation of sulfide minerals was mainly related to the model parameters defining the ratio of the active to the inactive passive ions (c 2 /c o ) dissolved in the pore water, and the variation of the current reaction parameters α and β The increase in these parameters as well as in the associated exchange current densities, i o (α) and i o (β) was consistent with an increase in the activation of the charge transfer at the metal-electrolyte interface, resulting in the decrease in polarization of such an interface, which was reflected by a decrease in the SIP phase response as previously argued by Wong. Under this premise, the model described fairly well measurements below 500 Hz from a laboratory experiment, being consistent with the depletion of the SIP phase response associated with the oxidation degree promoted on the disseminate sulfides analyzed here. This suggested that electrochemical modeling of SIP measurements can provide information to assess the oxidation state of sulfides and also to infer the formation of passivating layers coating the metal minerals during oxidation-dissolution processes. Our results suggested a possible alternative for the monitoring of mine waste deposits producing acid mine drainage and the stability of sequestered harmful metals during remedial treatments by means of the SIP method.

Original languageEnglish (US)
Pages (from-to)EN91-EN106
JournalGEOPHYSICS
Volume79
Issue number6
DOIs
StatePublished - Sep 23 2014

Fingerprint

induced polarization
Sulfides
Sand
sulfide
Polarization
oxidation
sand
Oxidation
modeling
Metals
metal
mineral
Minerals
mine waste
acid mine drainage
Silica sand
Sulfide minerals
pyrrhotite
density current
electrolyte

All Science Journal Classification (ASJC) codes

  • Geochemistry and Petrology

Cite this

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abstract = "We examined the sensitivity of the electrochemical spectral induced polarization (SIP) model developed by Wong to the oxidation extent of pyrite and pyrrhotite minerals disseminated in silica sand. The sensitivity of this model to the oxidation of sulfide minerals was mainly related to the model parameters defining the ratio of the active to the inactive passive ions (c 2 /c o ) dissolved in the pore water, and the variation of the current reaction parameters α and β The increase in these parameters as well as in the associated exchange current densities, i o (α) and i o (β) was consistent with an increase in the activation of the charge transfer at the metal-electrolyte interface, resulting in the decrease in polarization of such an interface, which was reflected by a decrease in the SIP phase response as previously argued by Wong. Under this premise, the model described fairly well measurements below 500 Hz from a laboratory experiment, being consistent with the depletion of the SIP phase response associated with the oxidation degree promoted on the disseminate sulfides analyzed here. This suggested that electrochemical modeling of SIP measurements can provide information to assess the oxidation state of sulfides and also to infer the formation of passivating layers coating the metal minerals during oxidation-dissolution processes. Our results suggested a possible alternative for the monitoring of mine waste deposits producing acid mine drainage and the stability of sequestered harmful metals during remedial treatments by means of the SIP method.",
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Electrochemical spectral induced polarization modeling of artificial sulfide-sand mixtures. / Placencia-Gómez, Edmundo; Slater, Lee.

In: GEOPHYSICS, Vol. 79, No. 6, 23.09.2014, p. EN91-EN106.

Research output: Contribution to journalArticle

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