TY - JOUR
T1 - Chalcopyrite Leaching Kinetics in the Presence of Methanol
AU - Solís Marcial, O. J.
AU - Nájera Bastida, A.
AU - Bañuelos, J. E.
AU - Valdés Martínez, O. U.
AU - Luevano, L. A.
AU - Serrano Rosales, B.
N1 - Publisher Copyright:
© 2019 Walter de Gruyter GmbH, Berlin/Boston.
PY - 2019/12/1
Y1 - 2019/12/1
N2 - The dissolution of chalcopyrite under near ambient conditions represents one of the main challenges in the copper industry. Thus, various routes have been proposed for chalcopyrite treatment, such as the use of polar organic solvents, and this has shown promising results. In this paper, we present a study of copper leaching from a chalcopyrite concentrate in aqueous acidic medium with methanol and various H2O2 concentrations at 15, 30, and 40â°C. The results show that nearly complete copper extraction was attained within 5âh at 40â°C. The extraction percentages were plotted as functions of time at each temperature. The experimental data were modeled using the shrinking core model considering the cylindrical particle shape (shrinking cylinder model) within acceptable confidence levels, yielding an estimated activation energy of 24.3âkJ/mol. Furthermore, the process was dependent on the H2O2 concentration, and it acts as a reagent rather than an oxidant in the leaching reaction. It was found that sulfur is the only species present in the solid phase formed during the leaching of chalcopyrite, demonstrating the co-dissolution of both copper and iron.
AB - The dissolution of chalcopyrite under near ambient conditions represents one of the main challenges in the copper industry. Thus, various routes have been proposed for chalcopyrite treatment, such as the use of polar organic solvents, and this has shown promising results. In this paper, we present a study of copper leaching from a chalcopyrite concentrate in aqueous acidic medium with methanol and various H2O2 concentrations at 15, 30, and 40â°C. The results show that nearly complete copper extraction was attained within 5âh at 40â°C. The extraction percentages were plotted as functions of time at each temperature. The experimental data were modeled using the shrinking core model considering the cylindrical particle shape (shrinking cylinder model) within acceptable confidence levels, yielding an estimated activation energy of 24.3âkJ/mol. Furthermore, the process was dependent on the H2O2 concentration, and it acts as a reagent rather than an oxidant in the leaching reaction. It was found that sulfur is the only species present in the solid phase formed during the leaching of chalcopyrite, demonstrating the co-dissolution of both copper and iron.
KW - chalcopyrite
KW - hydrogen peroxide
KW - leaching
KW - methanol
KW - shrinking core model
UR - http://www.scopus.com/inward/record.url?scp=85072553829&partnerID=8YFLogxK
U2 - 10.1515/ijcre-2019-0081
DO - 10.1515/ijcre-2019-0081
M3 - Artículo
AN - SCOPUS:85072553829
SN - 2194-5748
VL - 17
JO - International Journal of Chemical Reactor Engineering
JF - International Journal of Chemical Reactor Engineering
IS - 12
M1 - 20190081
ER -