首页|A cleaner production strategy for acid mine drainage prevention of waste rock:A porphyry copper case
A cleaner production strategy for acid mine drainage prevention of waste rock:A porphyry copper case
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An in-process technology approach is proposed to identify the source of acid mine drainage(AMD)gen-eration and prevent its formation in a porphyry copper waste rock(WR).Adopting actions before stock-piling the WR enables the establishment of potential contaminants and predicts the more convenient method for AMD prevention.A WR sample was separated into size fractions,and the WR's net acid-generating potential was quantified using chemical and mineralogical characterization.The diameter of physical locking of sulfides(DPLS)was determined,and the fractions below the DPLS were desulfur-ized using flotation.Finally,the WR fractions and tailing from the flotation test were submitted to acid-base accounting and weathering tests to evaluate their acid-generating potential.Results show that the WR's main sulfide mineral is pyrite,and the DPLS was defined as 850 μm.A sulfide recovery of 91％was achieved using a combination of HydroFloat® and Denver cells for a size fraction lower than DPLS.No grinding was conducted.The results show that size fractions greater than DPLS and the desulfurized WR are unlikely to produce AMD.The outcomes show that in-processing technology can be a more proactive approach and an effective tool for avoiding AMD in a porphyry copper WR.
Waste rockPorphyry copper oreDesulfurizationAcid mine drainageHydroFloat®In-process technologyCleaner production
Departamento de Ingeniería Química y Procesos de Minerales,Universidad de Antofagasta,Antofagasta,1240000,Chile
Research Institute on Mines and Environment,Université du Québec en Abitibi-Témiscamingue,Rouyn-Noranda,QC J9X5E4,Canada
Eriez Flotation Group Chile S.A.,Santiago,1240000,Chile
Geology and Sustainable Mining Institute,University Mohammed Ⅵ Polytechnic,Lot 660 Hay Moulay Rachid,Ben Guerir 43150,Morocco
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Agencia Nacional de Investigación y Desarrollo de Chile(ANID)Anillo-GrantAgencia Nacional de Investigación y Desarrollo de Chile(ANID)Anillo-GrantAgencia Nacional de Investigación y Desarrollo de Chile(ANID)Anillo-Grant
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