Comparative kinetic study of the silver-catalyzed chalcopyrite leaching at 35 and 68 °C

E. M. Córdoba; J. A. Muñoz; M. L. Blázquez; F. González; A. Ballester

doi:10.1016/j.minpro.2009.03.007

Comparative kinetic study of the silver-catalyzed chalcopyrite leaching at 35 and 68 °C

E. M. Córdoba, J. A. Muñoz, M. L. Blázquez, F. González, A. Ballester

Producción científica: Contribución a una revista › Artículo en revista científica indexada › revisión exhaustiva

22 Citas (Scopus)

Resumen

The influence of silver and iron concentration and the presence or absence of oxygen was investigated in the silver-catalyzed chalcopyrite leaching. The leaching tests were performed at two different temperatures (35 and 68 °C) in stirred flasks (180 rpm) containing 0.5 g of mineral and 100 mL of Fe³⁺/Fe²⁺ sulphate solutions at pH 1.8 and at an initial redox potential of 500 mV vs. Ag/AgCl. The addition of a great excess of silver favoured the transformation of chalcopyrite into copper-rich sulphides, such as: covellite, CuS, and geerite, Cu₈S₅. These sulphides prevented the formation of CuFeS₂/Ag₂S galvanic couple and, thus, the regeneration of silver. In addition, oxygen in solution plays a key role in the regeneration of silver ions acting as the main oxidizing agent for Ag₂S.

Idioma original	Inglés
Páginas (desde-hasta)	137-143
Número de páginas	7
Publicación	International Journal of Mineral Processing
Volumen	92
N.º	3-4
DOI	https://doi.org/10.1016/j.minpro.2009.03.007
Estado	Publicada - 1 ago. 2009
Publicado de forma externa	Sí

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title = "Comparative kinetic study of the silver-catalyzed chalcopyrite leaching at 35 and 68 °C",

abstract = "The influence of silver and iron concentration and the presence or absence of oxygen was investigated in the silver-catalyzed chalcopyrite leaching. The leaching tests were performed at two different temperatures (35 and 68 °C) in stirred flasks (180 rpm) containing 0.5 g of mineral and 100 mL of Fe3+/Fe2+ sulphate solutions at pH 1.8 and at an initial redox potential of 500 mV vs. Ag/AgCl. The addition of a great excess of silver favoured the transformation of chalcopyrite into copper-rich sulphides, such as: covellite, CuS, and geerite, Cu8S5. These sulphides prevented the formation of CuFeS2/Ag2S galvanic couple and, thus, the regeneration of silver. In addition, oxygen in solution plays a key role in the regeneration of silver ions acting as the main oxidizing agent for Ag2S.",

keywords = "Chalcopyrite, Ferric leaching, Oxygen, Silver catalysis, Temperature",

author = "C{\'o}rdoba, {E. M.} and Mu{\~n}oz, {J. A.} and Bl{\'a}zquez, {M. L.} and F. Gonz{\'a}lez and A. Ballester",

note = "Funding Information: The authors wish to express their gratitude to the Spanish Ministry of Science and Innovation for funding this work.",

year = "2009",

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day = "1",

doi = "10.1016/j.minpro.2009.03.007",

language = "Ingl{\'e}s",

volume = "92",

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TY - JOUR

T1 - Comparative kinetic study of the silver-catalyzed chalcopyrite leaching at 35 and 68 °C

AU - Córdoba, E. M.

AU - Muñoz, J. A.

AU - Blázquez, M. L.

AU - González, F.

AU - Ballester, A.

N1 - Funding Information: The authors wish to express their gratitude to the Spanish Ministry of Science and Innovation for funding this work.

PY - 2009/8/1

Y1 - 2009/8/1

N2 - The influence of silver and iron concentration and the presence or absence of oxygen was investigated in the silver-catalyzed chalcopyrite leaching. The leaching tests were performed at two different temperatures (35 and 68 °C) in stirred flasks (180 rpm) containing 0.5 g of mineral and 100 mL of Fe3+/Fe2+ sulphate solutions at pH 1.8 and at an initial redox potential of 500 mV vs. Ag/AgCl. The addition of a great excess of silver favoured the transformation of chalcopyrite into copper-rich sulphides, such as: covellite, CuS, and geerite, Cu8S5. These sulphides prevented the formation of CuFeS2/Ag2S galvanic couple and, thus, the regeneration of silver. In addition, oxygen in solution plays a key role in the regeneration of silver ions acting as the main oxidizing agent for Ag2S.

AB - The influence of silver and iron concentration and the presence or absence of oxygen was investigated in the silver-catalyzed chalcopyrite leaching. The leaching tests were performed at two different temperatures (35 and 68 °C) in stirred flasks (180 rpm) containing 0.5 g of mineral and 100 mL of Fe3+/Fe2+ sulphate solutions at pH 1.8 and at an initial redox potential of 500 mV vs. Ag/AgCl. The addition of a great excess of silver favoured the transformation of chalcopyrite into copper-rich sulphides, such as: covellite, CuS, and geerite, Cu8S5. These sulphides prevented the formation of CuFeS2/Ag2S galvanic couple and, thus, the regeneration of silver. In addition, oxygen in solution plays a key role in the regeneration of silver ions acting as the main oxidizing agent for Ag2S.

KW - Chalcopyrite

KW - Ferric leaching

KW - Oxygen

KW - Silver catalysis

KW - Temperature

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U2 - 10.1016/j.minpro.2009.03.007

DO - 10.1016/j.minpro.2009.03.007

M3 - Artículo en revista científica indexada

AN - SCOPUS:67349241648

SN - 0301-7516

VL - 92

SP - 137

EP - 143

JO - International Journal of Mineral Processing

JF - International Journal of Mineral Processing

IS - 3-4

ER -

Comparative kinetic study of the silver-catalyzed chalcopyrite leaching at 35 and 68 °C

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