Atmospheric oxidative and non-oxidative leaching of Ni-Cu matte by acidified ferric chloride solution

L. M. Sekhukhune, F. Ntuli, E. Muzenda

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The atmospheric leaching of copper-bearing matte by acidic ferric chloride solution was studied at the laboratory scale. The aim was to achieve maximum copper and nickel recovery by investigating the mechanisms of leaching, as well as identifying the effect of temperature, and concentration of ferric chloride and oxygen. Djurleite (Cu1.96S), hazelwoodite (Ni3S2), and Ni alloy were the primary phases detected in the matte. The quantitative composition of the matte was Cu 31%, Ni 50%, S 13%. Fe and Co constituted 2%, with platinum group metals (PGMs) accounting for 0.5%. A maximum nickel extraction of 98% was achieved using two-stage oxidative leaching at 90°C and 11 g/L Fe3+ as compared to 65% under non-oxidative conditions. A copper extraction of 99% was achieved in the first 45 minutes using two-stage non-oxidative leaching, and copper was recovered from solution by cementation. Three processes took place simultaneously throughout the leaching process, namely: dissolution, cementation/ metathesis, and oxidation. The leaching process was found to be diffusioncontrolled.

Original languageEnglish
Pages (from-to)401-409
Number of pages9
JournalJournal of the Southern African Institute of Mining and Metallurgy
Volume114
Issue number5
Publication statusPublished - Jan 1 2014

Fingerprint

Leaching
leaching
chloride
Copper
copper
Nickel
cementation
nickel
Bearings (structural)
Platinum
platinum
ferric chloride
Dissolution
Metals
dissolution
Oxygen
oxidation
Recovery
Oxidation
oxygen

All Science Journal Classification (ASJC) codes

  • Geotechnical Engineering and Engineering Geology
  • Metals and Alloys
  • Materials Chemistry

Cite this

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title = "Atmospheric oxidative and non-oxidative leaching of Ni-Cu matte by acidified ferric chloride solution",
abstract = "The atmospheric leaching of copper-bearing matte by acidic ferric chloride solution was studied at the laboratory scale. The aim was to achieve maximum copper and nickel recovery by investigating the mechanisms of leaching, as well as identifying the effect of temperature, and concentration of ferric chloride and oxygen. Djurleite (Cu1.96S), hazelwoodite (Ni3S2), and Ni alloy were the primary phases detected in the matte. The quantitative composition of the matte was Cu 31{\%}, Ni 50{\%}, S 13{\%}. Fe and Co constituted 2{\%}, with platinum group metals (PGMs) accounting for 0.5{\%}. A maximum nickel extraction of 98{\%} was achieved using two-stage oxidative leaching at 90°C and 11 g/L Fe3+ as compared to 65{\%} under non-oxidative conditions. A copper extraction of 99{\%} was achieved in the first 45 minutes using two-stage non-oxidative leaching, and copper was recovered from solution by cementation. Three processes took place simultaneously throughout the leaching process, namely: dissolution, cementation/ metathesis, and oxidation. The leaching process was found to be diffusioncontrolled.",
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Atmospheric oxidative and non-oxidative leaching of Ni-Cu matte by acidified ferric chloride solution. / Sekhukhune, L. M.; Ntuli, F.; Muzenda, E.

In: Journal of the Southern African Institute of Mining and Metallurgy, Vol. 114, No. 5, 01.01.2014, p. 401-409.

Research output: Contribution to journalArticle

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