Leaching kinetics of low grade zinc oxide ore in NH3-NH4Cl-H2O system |
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| Authors: | WANG Rui-xiang TANG Mo-tang YANG Sheng-hai ZHAGN Wen-hai TANG Chao-bo HE Jing YANG Jian-guang |
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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-NH4Cl-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 7.057kJ/mol. The leaching efficiency of zinc is 92.1% under the conditions of ore particle size of 69μm, holding at 80℃ for 60min, sum ammonia concentration of 7.5mol/L, the molar ratio of ammonium to ammonia being 2:1, and the ratio (g/mL) of solid to liquid being 1:10. |
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| Keywords: | NH3-NH4Cl-H2O system low-grade zinc oxide ore leaching kinetics |
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