Dissolution of pure chalcopyrite with manganese nodules and waste water
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AuthorToro Villarroel, Norman Rodrigo; Pérez Salinas, Kevin; Saldaña Pino, Manuel; Jeldres Valenzuela, Ricardo Iván; Jeldres, Matías; [et al.]
SponsorsThe authors are grateful for the contribution of the Scien-tific Equipment Unit- MAINI of the Universidad Católica delNorte for aiding in generating data by automated electronicmicroscopy QEMSCAN®and for facilitating the chemical anal-ysis of the solutions. We are also grateful to Marina VargasAleuy, María Barraza Bustos and Carolina Ossandón Cortésof the Universidad Católica del Norte for supporting theexperimental tests. R.I.J thanks Centro CRHIAM Project Coni-cyt/Fondap/15130015.
Bibliographic CitationToro, N., Pérez, K., Saldaña, M., Jeldres, R., Jeldres, M., & Cánovas, M. (2020). Dissolution of pure chalcopyrite with manganese nodules and waste water. Journal of materials research and technology, 9, 798-805.
Chalcopyrite is the most abundant copper ore and, consequently, the most utilised to pro-duce metallic copper. The main route of treatment is through pyrometallurgical processes,but these emit significant quantities of SO2into the atmosphere (e.g. 182,000 t/year among allChilean smelters), producing mighty concern in the community. In this context, hydromet-allurgy is presented as an alternative that may be more environmentally friendly; however,the difficulties of processing sulphide minerals prevent achieving sustainable efficienciesfor the industry. In this research, a pure chalcopyrite mineral is leached at 25◦C with theaddition of manganese nodules as an oxidizing agent, and wastewater with a high con-centration of chloride that both enhances the dissolution and avoid the passivation of thechalcopyrite. The high concentrations of MnO2(4/1 and 5/1) allows that the potential valuescan be between 580 and 650 mV, which favors the dissolution of CuFeS2. The XRD showedthe formation of ...
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