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Characterization and kinetic study on ammonia leaching of complex copper ore 被引量:8
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作者 a.a.baba M.K.GHOSH +3 位作者 S.R.PRADHAN D.S.RAO A.BARAL F.A.ADEKOLA 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2014年第5期1587-1595,共9页
Ammonia leaching kinetics of a complex Cu-ore assaying 8.8% Cu and 36.1% Fe was examined. Mineralogical characterization indicated that the major phase of the ore was siderite with chalcopyrite as the major sulfide mi... Ammonia leaching kinetics of a complex Cu-ore assaying 8.8% Cu and 36.1% Fe was examined. Mineralogical characterization indicated that the major phase of the ore was siderite with chalcopyrite as the major sulfide mineral. The effects of parameters such as agitation, temperature, NH3 concentration, particle size and oxygen partial pressure (Po2) were investigated. Under the standard leaching conditions of 125-212 μm particle size, 120 ℃, 1.29 mol/L NH3 and 202 kPa ofpo2, about 83% Cu could be selectively extracted in 2.5 h. However, when using higher NH3 concentration and lower particle size, more than 95% extraction was achieved. The leaching process was found to be surface reaction controlling. The estimated activation energy was (37.6±1.9) kJ/mol and empirical orders of reaction with respect topos and [NH3] were about 0.2 and 1, respectively. 展开更多
关键词 ammonia leaching CHALCOPYRITE SIDERITE leaching kinetics
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