Reaction condition optimization and kinetic investigation of roasting zinc oxide ore using （NH4）2SO4
来源期刊：International Journal of Minerals Metallurgy and Materials2016年第10期
论文作者：Hong-mei Shao Xiao-yi Shen Yi Sun Yan Liu Yu-chun Zhai
文章页码：1133 - 1140
摘 要：An orthogonal test was used to optimize the reaction conditions of roasting zinc oxide ore using（NH4）2SO4. The optimized reaction conditions are defined as an（NH4）2SO4/zinc molar ratio of 1.4:1, a roasting temperature of 440°C, and a thermostatic time of 60 min. The molar ratio of（NH4）2SO4/zinc is the most predominant factor and the roasting temperature is the second significant factor that governs the zinc extraction. Thermogravimetric–differential thermal analysis was used for（NH4）2SO4 and zinc mixed in a molar ratio of 1.4:1 at the heating rates of 5, 10, 15, and 20 K·min-1. Two strong endothermic peaks indicate that the complex chemical reactions occur at approximately 290°C and 400°C. XRD analysis was employed to examine the transformations of mineral phases during roasting process. Kinetic parameters, including reaction apparent activation energy, reaction order, and frequency factor, were calculated by the Doyle–Ozawa and Kissinger methods. Corresponding to the two endothermic peaks, the kinetic equations were obtained.
Hong-mei Shao，Xiao-yi Shen，Yi Sun，Yan Liu，Yu-chun Zhai
School of Metallurgy, Northeastern University
摘 要：An orthogonal test was used to optimize the reaction conditions of roasting zinc oxide ore using（NH4）2SO4. The optimized reaction conditions are defined as an（NH4）2SO4/zinc molar ratio of 1.4:1, a roasting temperature of 440°C, and a thermostatic time of 60 min. The molar ratio of（NH4）2SO4/zinc is the most predominant factor and the roasting temperature is the second significant factor that governs the zinc extraction. Thermogravimetric–differential thermal analysis was used for（NH4）2SO4 and zinc mixed in a molar ratio of 1.4:1 at the heating rates of 5, 10, 15, and 20 K·min-1. Two strong endothermic peaks indicate that the complex chemical reactions occur at approximately 290°C and 400°C. XRD analysis was employed to examine the transformations of mineral phases during roasting process. Kinetic parameters, including reaction apparent activation energy, reaction order, and frequency factor, were calculated by the Doyle–Ozawa and Kissinger methods. Corresponding to the two endothermic peaks, the kinetic equations were obtained.
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