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Dissolution kinetics of secondary covellite resulted fromdigenitedissolutionin ferric/acid/chloride media

Treść / Zawartość
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Warianty tytułu
Języki publikacji
EN
Abstrakty
EN
Dissolution kinetics of digenite (Cu9S5) was studied in Fe3+-H2SO4-NaCl media. The temperature range for the study was between 297 and 373 K (24 and 100°C), with a ferric concentration between 0.0100 and 0.0806 mol/dm3, a sulfuric acid concentration of 0.05 to 1.5 mol/dm3 and a NaCl concentration of 1.5 to 5 mol/dm3. Agitation speed and particle size were also studied. Results indicate that the dissolution mechanisms of digenite occurs in two stages: i) generation of covellite (CuS) with the formation of cupric ion (Cu2+) and ii) dissolution of covellite (CuS) with copper production in the system, as well as amorphous sulfur (S°). The second stage occurred very slowly compared to the first stage, the above variables studied directly affected the second stage. Temperature, Fe3+ and H2SO4 concentration positively affected dissolution of covellite formed (second stage), while the presence of NaCl did not increase dissolution of Cu9S5 or CuS. Results showed that stirring speed had an important role in the dissolution rate of CuS. Dissolution kinetics was analyzed using the model of diffusion through the porous layer. Covellite dissolution reaction order was 2.3 and 0.2 with respect to the concentration of ferric and sulfuric acid, respectively, and the rate was inversely proportional to particle size. The calculated activation energy was 36.1 kJ/mol, which is a typical value for a reaction controlled by diffusion in the porous layer at temperature between 297 and 373 K (24 and 100°C).
Słowa kluczowe
Rocznik
Strony
840--851
Opis fizyczny
Bibliogr. 21 poz., rys., tab., wz.
Twórcy
  • Escuela de Ingeniería Química, Pontificia Universidad Católica de Valparaíso, Avenida Brasil 2162, Cod. Postal 2362854, Valparaíso, Chile
  • Escuela de Ingeniería Química, Pontificia Universidad Católica de Valparaíso, Avenida Brasil 2162, Cod. Postal 2362854, Valparaíso, Chile
autor
  • Instituto de Geología Económica Aplicada (GEA), Universidad de Concepción, Casilla 160-C, Concepción, Chile
  • Instituto de Investigación Multidisciplinar en Ciencias y Tecnología, Universidad de La Serena, Benavente 980, 1720170, La Serena, Chile
  • International Organization for Dew Utilization (OPUR), 60 rue Emeriau, Paris, France
  • Departamento de Ingeniería Química y Medio Ambiental, Universidad Técnica Federico Santa María, Avenida España 1680, Valparaíso, Chile
Bibliografia
  • ANTONIJEVIC,M. M., DIMITRIJEVIC,M.,JANKOVIC,Z., 1997. Leaching of pyrite with hydrogen peroxide in sulphuric acid. Hydrometallurgy 46,71-83.
  • DOMIC, E., 2001, Hidrometalurgia,Fundamentos, procesos y aplicaciones, Editorial Null, Santiago, Chile.
  • DUTRIZAC,J. E., MACDONALD,R. J. C.,INGRAHAM,TR., 1970. The kinetics of dissolution of bornite in acidified ferric sulfate solutions. Metallurgical Transactions 1, 225-226.
  • FISHER,W. W., 1994. Comparison of chalcocite dissolution in the sulfate, perchlorate, nitrate, chloride, ammonia, and cyanide systems. Minerals Engineering 7, 99-103.
  • GRIZO, A., PACOVIC, N., POPOSK , F., KONESKA, Z., 1982. Leaching of a low-grade chalcocite-covellite ore containing iron in sulphuricacid: The influence of pH and particle size on the kinetics of copper leaching. Hydrometallurgy 8, 5-16.
  • HERREROS., O., QUIROZ, R., HERNÁNDEZ,M.C.,VIÑALS, J., 2002. Dissolution kinetics of enargite in dilute Cl2/Cl-media. Hydrometallurgy 64, 153-160.
  • HIROYOSHI, N., MIKI, H., HIRAJIMA, T.,TSUNEKAWA, M., 2001. Enhancement of chalcopyrite leaching by ferrous ions in acidic ferric sulfate solutions. Hydrometallurgy 60, 185-197.
  • LU, J., DREISINGER, D., 2013. Copper chloride leaching from chalcopyrite and bornite concentrates containing high levels of impurities and minor elements. Hydrometallurgy 138, 40-47.
  • LU, Z., JEFFREY, M.,LAWSON, F., 2000. The effect of chloride ions on the dissolution of chalcopyrite in acidic solutions. Hydrometallurgy 26,189-202.
  • MIKI, H., NICOL, M.,VELÁSQUEZ-YÉVENES, L., 2011. The kinetics of dissolution of synthetic covellite, chalcocite and digenite in dilute chloride solutions at ambient temperatures. Hydrometallurgy 105, 321-327.
  • PADILLA, R., GIRÓN, D.,RUIZ, MC., 2005. Leaching of enargite in H2SO4-NaCl-O2media. Hydrometallurgy 60, 272-279.
  • PADILLA, R., JEREZ, O.,RUIZ, MC., 2015. Kinetics of the pressure leaching of enargite in FeSO4-H2SO4-O2 media. Hydrometallurgy 58, 49-55.
  • PESIC, B.,OLSON, FA., 1983. Leaching of bornite in acidified ferric chloride solutions. Metallurgical Transactions B 14B, 577-578.
  • PESIC, B.,OLSON, FA., 1984. Dissolution of bornite in sulfuric acid using oxygen as oxidant. Hydrometallurgy 12, 195-215.
  • RENMAN, R., LIU, Z., BIAN, WU., GUIYING, Z.,JIANKANG, W., 2010. Comparison on the leaching kinetics of chalcocite and pyrite with or without bacteria. Rare Metals 29, 552-562.
  • RIVEROS, PA.,DUTRIZAC, JE., 2008. The leaching of tennantite, tetrahedrite and enargite in acidic sulphateand chloride media. Canadian Metallurgical Quarterly 47, 235-244.
  • RUIZ, MC., HONORES, S.,PADILLA, R., 1999. Leaching kinetics of digenite concentrate in oxygen chloride media at ambient pressure. Metallurgical and Materials Transactions B 29B, 961-969.
  • SENANAYAKE, G., 2007. Chloride assisted leaching of chalcocite by oxygenated sulphuric acid via Cu(II)-OH-Cl. Minerals Engineering 20, 1075-1088.
  • SHON, HY., WADSWORTH, ME., 1979. Rate processes of extractive metallurgy. Plenum Press, New York, United State of America.
  • TONGAMP, W., TAKASAKI, Y.,SHIBAYAMA , A., 2010. Selective leaching of arsenic from enargite in NaHS-NaOH. Hydrometallurgy 101, 64-68.
  • YOO, K., KIM, SK., LEE, JC., ITO, M., TSUNEKAWA, M.,HIROYOSHI, N., 2010. Effect of chloride ions on leaching rate of chalcopyrite. Minerals Engineering 23, 471-477.
Uwagi
Opracowanie rekordu ze środków MNiSW, umowa Nr 461252 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2020).
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-d8b86974-a94b-4216-b337-ef76654cfd89
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