Leaching kinetics of low grade zinc oxide ore in NH3-NH4Cl-H2O system |
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| Authors: | Rui-xiang Wang Mo-tang Tang Sheng-hai Yang Wen-hai Zhagn Chao-bo Tang Jing He and Jian-guang Yang |
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| Affiliation: | (1) School of Metallurgical Science and Engineering, Central South University, Changsha, 410083, China;(2) School of Materials and Chemical Engineering, Jiangxi University of Science and Technology, Ganzhou, 341000, China |
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| Abstract: | The leaching kinetics of low grade zinc oxide ore in NH3-NH4Cl-H2O system was studied. The effects of ore particle size, reaction temperature and the sum concentration of ammonium ion and
ammonia on the leaching efficiency of zinc were examined. The leaching kinetics of low-grade zinc oxide ore in NH3-NY4Cl-H2O system follows the kinetic law of shrinking-core model. The results show that diffusion through the inert particle pores
is the leaching kinetics rate controlling step. The calculated apparent activation energy of the process is about 7.057 kJ/mol.
The leaching efficiency of zinc is 92.1% under the conditions of ore particle size of 69 μm, holding at 80 °C for 60 min,
sum ammonia concentration of 7.5 mol/L, the molar ratio of ammonium to ammonia being 2:1, and the ratio (g/mL) of solid to
liquid being 1:10.
Foundation item: Project(2007CB613604) supported by the Major State Basic Research Development Program of China; Project(50674104) supported
by the National Natural Science Foundation of China; Project(GJJ08279) supported by the Department of Education of Jiangxi
Province |
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| Keywords: | NH3-NH4Cl-H2O system low-grade zinc oxide ore leaching kinetics |
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