A cleaner production strategy for acid mine drainage prevention of waste rock:A porphyry copper case  

作　　者：Yesica L.Botero Isabelle Demers Luis A.Cisternas ArnoldoÁvila Mostafa Benzaazoua 

机构地区：[1]Departamento de Ingeniería Química y Procesos de Minerales,Universidad de Antofagasta,Antofagasta,1240000,Chile [2]Research Institute on Mines and Environment,Universitédu Québec en Abitibi-Témiscamingue,Rouyn-Noranda,QC J9X5E4,Canada [3]Eriez Flotation Group Chile S.A.,Santiago,1240000,Chile [4]Geology and Sustainable Mining Institute,University Mohammed Ⅵ Polytechnic,Lot 660 Hay Moulay Rachid,Ben Guerir 43150,Morocco

出　　处：《International Journal of Mining Science and Technology》2024年第8期1163-1177,共15页矿业科学技术学报（英文版）

基　　金：supported by Agencia Nacional de Investigación y Desarrollo de Chile(ANID);Anillo-Grant ANID/ACT210027,Fondecyt 1211498,and ANID/AFB230001;the ANID scholarship Grant 21210801;partially performed by Luis Cisternas during the visit to the Universitédu Québec,supported by MINEDUC-UA project,code ANT1999.

摘　　要：An in-process technology approach is proposed to identify the source of acid mine drainage(AMD)generation and prevent its formation in a porphyry copper waste rock(WR).Adopting actions before stockpiling 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 acidgenerating 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 desulfurized 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 850μm.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.

关 键 词：Waste rock Porphyry copper ore DESULFURIZATION Acid mine drainage HydroFloat^(®) In-process technology Cleaner production 

分 类 号：TD862.1[矿业工程—金属矿开采] X753[矿业工程—矿山开采]