Abstract
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.
基金项目
Agencia Nacional de Investigación y Desarrollo de Chile(ANID)Anillo-Grant(ANID/ACT210027)
Agencia Nacional de Investigación y Desarrollo de Chile(ANID)Anillo-Grant(Fondecyt 1211498)
Agencia Nacional de Investigación y Desarrollo de Chile(ANID)Anillo-Grant(ANID/AFB230001)
维普
万方数据