Peroxodisulfate assisted leaching of chalcopyrite

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

This research investigated the effectiveness of peroxodisulfate (S 2O 8 2-) for enhancing copper leaching rates from chalcopyrite. Batch and column experiments were performed using sulfuric acid leach solutions at pH = 2, with and without Na 2S 2O 8. The presence of peroxodisulfate greatly increased copper leaching rates. Tafel analysis and electrochemical impedance spectroscopy experiments performed using chalcopyrite powder electrodes indicated that peroxodisulfate increased the corrosion rate by decreasing the charge transfer resistance for chalcopyrite oxidation. In contrast to the preferential leaching of iron that has been observed for other oxidants added to chalcopyrite leach solutions, peroxodisulfate assisted leaching resulted in the release 1 mol of Cu per mole of Fe, which is identical to their stoichiometric ratio in chalcopyrite. Rates of Cu leaching from chalcopyrite followed a surface reaction rate limited, shrinking-core model with an apparent activation energy of 41 kJ/mol.

Original languageEnglish (US)
Pages (from-to)68-73
Number of pages6
JournalHydrometallurgy
Volume121-124
DOIs
StatePublished - Jun 2012

Fingerprint

Leaching
Copper
Surface reactions
Corrosion rate
Electrochemical impedance spectroscopy
Oxidants
Sulfuric acid
Reaction rates
Charge transfer
Powders
Activation energy
Experiments
chalcopyrite
Iron
Oxidation
Electrodes

Keywords

  • Chalcopyrite
  • Copper
  • Leaching
  • Peroxodisulfate

ASJC Scopus subject areas

  • Industrial and Manufacturing Engineering
  • Materials Chemistry
  • Metals and Alloys

Cite this

Peroxodisulfate assisted leaching of chalcopyrite. / Dakubo, Francis; Baygents, James C; Farrell, James.

In: Hydrometallurgy, Vol. 121-124, 06.2012, p. 68-73.

Research output: Contribution to journalArticle

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abstract = "This research investigated the effectiveness of peroxodisulfate (S 2O 8 2-) for enhancing copper leaching rates from chalcopyrite. Batch and column experiments were performed using sulfuric acid leach solutions at pH = 2, with and without Na 2S 2O 8. The presence of peroxodisulfate greatly increased copper leaching rates. Tafel analysis and electrochemical impedance spectroscopy experiments performed using chalcopyrite powder electrodes indicated that peroxodisulfate increased the corrosion rate by decreasing the charge transfer resistance for chalcopyrite oxidation. In contrast to the preferential leaching of iron that has been observed for other oxidants added to chalcopyrite leach solutions, peroxodisulfate assisted leaching resulted in the release 1 mol of Cu per mole of Fe, which is identical to their stoichiometric ratio in chalcopyrite. Rates of Cu leaching from chalcopyrite followed a surface reaction rate limited, shrinking-core model with an apparent activation energy of 41 kJ/mol.",
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N2 - This research investigated the effectiveness of peroxodisulfate (S 2O 8 2-) for enhancing copper leaching rates from chalcopyrite. Batch and column experiments were performed using sulfuric acid leach solutions at pH = 2, with and without Na 2S 2O 8. The presence of peroxodisulfate greatly increased copper leaching rates. Tafel analysis and electrochemical impedance spectroscopy experiments performed using chalcopyrite powder electrodes indicated that peroxodisulfate increased the corrosion rate by decreasing the charge transfer resistance for chalcopyrite oxidation. In contrast to the preferential leaching of iron that has been observed for other oxidants added to chalcopyrite leach solutions, peroxodisulfate assisted leaching resulted in the release 1 mol of Cu per mole of Fe, which is identical to their stoichiometric ratio in chalcopyrite. Rates of Cu leaching from chalcopyrite followed a surface reaction rate limited, shrinking-core model with an apparent activation energy of 41 kJ/mol.

AB - This research investigated the effectiveness of peroxodisulfate (S 2O 8 2-) for enhancing copper leaching rates from chalcopyrite. Batch and column experiments were performed using sulfuric acid leach solutions at pH = 2, with and without Na 2S 2O 8. The presence of peroxodisulfate greatly increased copper leaching rates. Tafel analysis and electrochemical impedance spectroscopy experiments performed using chalcopyrite powder electrodes indicated that peroxodisulfate increased the corrosion rate by decreasing the charge transfer resistance for chalcopyrite oxidation. In contrast to the preferential leaching of iron that has been observed for other oxidants added to chalcopyrite leach solutions, peroxodisulfate assisted leaching resulted in the release 1 mol of Cu per mole of Fe, which is identical to their stoichiometric ratio in chalcopyrite. Rates of Cu leaching from chalcopyrite followed a surface reaction rate limited, shrinking-core model with an apparent activation energy of 41 kJ/mol.

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