Thermodynamics and kinetics of extracting zinc from zinc oxide ore by the ammonium sulfate roasting method
来源期刊：International Journal of Minerals Metallurgy and Materials2015年第5期
论文作者：Yi Sun Xiao-yi Shen Yu-chun Zhai
文章页码：467 - 475
摘 要：Thermodynamic analyses and kinetic studies were performed on zinc oxide ore treatment by（NH4）2SO4 roasting technology. The results show that it is theoretically feasible to realize a roasting reaction between the zinc oxide ore and（NH4）2SO4 in a temperature range of 573–723 K. The effects of reaction temperature and particle size on the extraction rate of zinc were also examined. It is found that a surface chemical reaction is the rate-controlling step in roasting kinetics. The calculated activation energy of this process is about 45.57 k J/mol, and the kinetic model can be expressed as follows: 1-（1- α）1/3 = 30.85 exp（-45.57/RT）·t. An extraction ratio of zinc as high as 92% could be achieved under the optimum conditions.
Yi Sun，Xiao-yi Shen，Yu-chun Zhai
School of Materials and Metallurgy, Northeastern University
摘 要：Thermodynamic analyses and kinetic studies were performed on zinc oxide ore treatment by（NH4）2SO4 roasting technology. The results show that it is theoretically feasible to realize a roasting reaction between the zinc oxide ore and（NH4）2SO4 in a temperature range of 573–723 K. The effects of reaction temperature and particle size on the extraction rate of zinc were also examined. It is found that a surface chemical reaction is the rate-controlling step in roasting kinetics. The calculated activation energy of this process is about 45.57 k J/mol, and the kinetic model can be expressed as follows: 1-（1- α）1/3 = 30.85 exp（-45.57/RT）·t. An extraction ratio of zinc as high as 92% could be achieved under the optimum conditions.
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