Zinc recovery from sphalerite concentrate by direct oxidative leaching with ammonium, sodium and potassium persulphates

被引:69
作者
Babu, MN [1 ]
Sahu, KK [1 ]
Pandey, BD [1 ]
机构
[1] Natl Met Lab, Non Ferrous Proc Div, Jamshedpur 831007, Bihar, India
关键词
sphalerite; oxidative leaching; ammonium persulphate; diffusion-controlled kinetic model;
D O I
10.1016/S0304-386X(02)00030-0
中图分类号
TF [冶金工业];
学科分类号
0806 ;
摘要
The recovery of zinc from sphalerite concentrate by oxidative leaching with ammonium, sodium and potassium persulphates in sulphuric acid media is reported in this investigation. Effects of particle size, reaction temperature, acid concentration, pulp density (PD) and oxidant concentration on zinc dissolution rate were determined. The results showed that leaching of 95% zinc was achieved from the concentrate of particle size -150 mum at a temperature of 333 K for 5 h in the presence of 20% (w/v) ammonium persulphate (APS) with 5% (v/v) sulphuric acid concentration. The best fit of the kinetic data to a diffusion-controlled model indicated that diffusion through the product layer was the rate-controlling step during the dissolution. The activation energy was determined to be 41+/-2 kJ/mol in the temperature range 308-333 K which was also an indication of the diffusion-controlled process. The mechanism of the leaching was further established by characterising the original concentrate and the leach residue by XRD phase identification, optical and SEM-EDS studies. (C) 2002 Published by Elsevier Science B.V.
引用
收藏
页码:119 / 129
页数:11
相关论文
共 24 条
  • [1] OXIDATIVE LEACHING OF MECHANICALLY ACTIVATED SPHALERITE
    BALAZ, P
    EBERT, I
    [J]. HYDROMETALLURGY, 1991, 27 (02) : 141 - 150
  • [2] Effect of trace additives on the efficiency of peroxydisulfate regeneration
    Balazs, GB
    Cooper, JF
    Shell, TE
    [J]. JOURNAL OF APPLIED ELECTROCHEMISTRY, 1999, 29 (03) : 285 - 292
  • [3] DEGUIRE MF, 1978, WORLD MIN, V31, P92
  • [4] DUTRIZAC JE, 1974, MINERALS SCIENCE ENG, V6, P59
  • [5] Forward F.A., 1959, JOM-US, V11, P836, DOI [10.1007/BF03397848, DOI 10.1007/BF03397848]
  • [6] FRASER DB, 1977, MET 77 30 ANN C AUST
  • [7] JIN ZM, 1993, INT J MINER PROCESS, V37, P223
  • [8] KOLTHOFF IM, 1947, VOLUMETRIC ANAL, V2, P209
  • [9] LACHMANN J, 1995, HYDROMETALLURGY, V37, P89
  • [10] Oxidizing leaching of complex sulphides in ammonium chloride: sphalerite leaching kinetics
    Limpo, JL
    [J]. REVISTA DE METALURGIA, 1997, 33 (04) : 258 - 270