Enargite, known as one of the major arsenic containing copper minerals, with approximately 19% arsenic, introduces challenges to typical processing options. In most hydrometallurgical processing methods, arsenic remediation occurs after the copper recovery in an autoclave or in a stepwise neutralization process. In this study, the in situ precipitation of scorodite was investigated during an atmospheric leaching process in the presence of carbon-based catalysts and chloride media. The effective parameters of initial ferric addition, temperature, catalyst addition, and oxygen sparging rate were studied and the ferric behaviour was monitored during the scorodite precipitation. The most influential parameters on efficient scorodite precipitation are found to be: initial ferric addition, catalyst to concentrate ratio, and temperature. A 99% scorodite precipitation yield was achieved in this process.
This is a preview of subscription content, log in to check access.
Filippou D, Demopoulos GP (1997) Arsenic immobilization by controlled scorodite precipitation. JOM 49(12):52–55CrossRefGoogle Scholar
Robins RG (1987) Solubility and stability of scorodite, FeAsO4•2H2O: discussion. Am Mineral 72:842–844Google Scholar
Dutrizac JE, Jambor JL (1987) The behaviour of arsenic during jarosite precipitation: arsenic precipitation at 97 °C from sulphate or chloride media. Can Metall Q 26(2):91–101CrossRefGoogle Scholar
Demopoulos GP, Droppert DJ, Van Weert G (1995) Precipitation of crystalline scorodite (FeAsO4•2H2O) from chloride solutions. Hydrometallurgy 38(94):245–261CrossRefGoogle Scholar
Droppert DJ (1996) The ambient pressure precipitation of crystalline scorodite (FeAsO4•2H2O) from sulphate solutions. McGillGoogle Scholar
Demopoulos GP (2014) Arsenic immobilization research advances: past, present and future. In: COM 2014Google Scholar
Choi Y, Ghahremaninezhad A, Ahern N (2014) Process for activated carbon-assisted oxidation of arsenic species in process solutions and waste waters. In: COM 2014, pp 1–9Google Scholar
Dutrizac JE, MacDonald RJC (1972) The kinetics of dissolution of enargite in acidified ferric sulphate solutions. Can Metall Q 11(3):469–477CrossRefGoogle Scholar
Jahromi FG, Cowan DH, Ghahreman A (2017) Lanxess Lewatit® AF5 and activated carbon catalysis of enargite leaching in chloride media; a parameters study. Hydrometallurgy 174(May):184–194CrossRefGoogle Scholar
Parker AJ, Paul RL, Power GP (1981) Electrochemical aspects of leaching copper from chalcopyrite in ferric and cupric salt solutions. Aust J Chem 34(1):13–34CrossRefGoogle Scholar
Miki H, Nicol M (2008) The kinetics of the copper-catalysed oxidation of iron(II) in chloride solutions. In: Hydrometallurgy 2008: 6th International Symposium, pp 971–979Google Scholar
Padilla R, Girón D, Ruiz MC (2005) Leaching of enargite in H2SO4–NaCl–O2 media. Hydrometallurgy 80(4):272–279CrossRefGoogle Scholar
Le Berre JF, Gauvin R, Demopoulos GP (2008) A study of the crystallization kinetics of scorodite via the transformation of poorly crystalline ferric arsenate in weakly acidic solution. Colloids Surf A Physicochem Eng Asp 315(1–3):117–129CrossRefGoogle Scholar
Ahumada E, Lizama H, Orellana F, Suarez C, Huidobro A, Seoulveda-Escribano A, Rodriquez-Reinoso F (2002) Catalytic oxidation of Fe (II) by activated carbon in the presence of oxygen. Effect of the surface oxidation degree on the catalytic activity. Carbon N Y 40:2827–2834CrossRefGoogle Scholar