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氨浸出混合铜矿石的表征及动力学

A. A. BABA M. K. GHOSH S. R. PRADHAN D. S. RAO A. BARAL F. A. ADEKOLA

中国有色金属学报：英文版, 2014, Vol.24 (5), p.1587-1595 [Periódico revisado por pares]

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  • Título:
    氨浸出混合铜矿石的表征及动力学
  • Autor: A. A. BABA M. K. GHOSH S. R. PRADHAN D. S. RAO A. BARAL F. A. ADEKOLA
  • Assuntos: 氨浸出 ; 浸出动力学 ; 菱铁矿 ; 黄铜矿
  • É parte de: 中国有色金属学报：英文版, 2014, Vol.24 (5), p.1587-1595
  • Notas: ammonia leaching; chalcopyrite; siderite; leaching kinetics
    43-1239/TG
    A. A. BABA, M. K. GHOSH, S. R. PRADHAN, D. S. RAO, A. BARAL, F. A. ADEKOLA（ 1. Department of Industrial Chemistry, University of Ilorin, P.M.B. 1515, Ilorin-240003, Nigeria; 2. CSIR-Institute of Minerals and Materials Technology, Bhubaneswar-751013, India）
    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.
  • Descrição: 研究了含8.8％Cu和36.1％Fe的混合铜矿石的氨浸出动力学.矿物学表征表明,该矿石的含铁成分以菱铁矿为主,硫化矿以黄铜矿为主.研究了工艺参数,如搅拌速度、反应温度、氨浓度、矿石粒径、氧分压对氨浸出过程的影响.在标准的浸出条件下,即粒径125～212 μm、反应温度120℃、NH3浓度1.29 mol/L、氧分压202 kPa,在2.5 h内Cu的浸出率达到83％.在使用较高浓度的氨和较小粒径的矿石时,Cu的浸出率能够达到95％.动力学研究结果表明,浸出过程为表面反应控制,估算出的活化能为（37.6±1.9） kJ/mol,氧分压与氨浓度的反应级数分别为0.2和1.
  • Idioma: Inglês
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