Extraction of iron and aluminum from high-iron bauxite by ammonium sulfate roasting and water leaching
Ding Tian1,2 Xiao-yi Shen1,3 Yu-chun Zhai1,4 Penny Xiao5 Paul Webley5
1 School of Metallurgy, Northeastern University, Shenyang 110819, Liaoning, China； 2 School of Material Science and Engineering, Dalian Jiaotong University, Dalian 116028, Liaoning, China； 3 Liaoning Key Laboratory for Metallurgical Sensor and Technology, Northeastern University, Shenyang 110819, Liaoning, China； 4 School of Resources and Materials, Northeastern University at Qinhuangdao, Qinhuangdao 066004, Hebei, China；5 Department of Chemical & Biomolecular Engineering, University of Melbourne, Melbourne 3010, VIC, Australia
Extraction of iron and aluminum from high-iron bauxite by ammonium sulfate roasting and water leaching
Ding Tian1,2 Xiao-yi Shen1,3 Yu-chun Zhai1,4 Penny Xiao5 Paul Webley5
1 School of Metallurgy, Northeastern University, Shenyang 110819, Liaoning, China； 2 School of Material Science and Engineering, Dalian Jiaotong University, Dalian 116028, Liaoning, China； 3 Liaoning Key Laboratory for Metallurgical Sensor and Technology, Northeastern University, Shenyang 110819, Liaoning, China； 4 School of Resources and Materials, Northeastern University at Qinhuangdao, Qinhuangdao 066004, Hebei, China；5 Department of Chemical & Biomolecular Engineering, University of Melbourne, Melbourne 3010, VIC, Australia
摘要 High iron content is one of the challenges in utilizing the refractory bauxites in China. An improved method for treating the high-iron bauxite by roasting with (NH4)2SO4 was proposed, which offers a possible alternative method for utilizing the high-iron bauxite. The influences of the roasting time, roasting temperature, material ratio, and ore particle size on the extraction ratios of Fe and Al were studied, and the orthogonal test was used to optimize the reaction conditions. The optimized reaction conditions were proposed as follows: roasting temperature of 450 C, roasting time of 120 min, material ratio of (NH4)2SO4 to ore of 2.5:1.0, and ore particle size below 80 lm. The roasting mechanism and kinetic parameters including the apparent activation energy and reaction rate constant were investigated. The results showed that the control step of the roasting process was the internal diffusion on the product layer and the apparent activation energy was 19.22 kJ mol-1 in the reaction temperature range. The kinetic equation was obtained finally.
Abstract：High iron content is one of the challenges in utilizing the refractory bauxites in China. An improved method for treating the high-iron bauxite by roasting with (NH4)2SO4 was proposed, which offers a possible alternative method for utilizing the high-iron bauxite. The influences of the roasting time, roasting temperature, material ratio, and ore particle size on the extraction ratios of Fe and Al were studied, and the orthogonal test was used to optimize the reaction conditions. The optimized reaction conditions were proposed as follows: roasting temperature of 450 C, roasting time of 120 min, material ratio of (NH4)2SO4 to ore of 2.5:1.0, and ore particle size below 80 lm. The roasting mechanism and kinetic parameters including the apparent activation energy and reaction rate constant were investigated. The results showed that the control step of the roasting process was the internal diffusion on the product layer and the apparent activation energy was 19.22 kJ mol-1 in the reaction temperature range. The kinetic equation was obtained finally.
Ding Tian,Xiao-yi Shen,Yu-chun Zhai, et al. Extraction of iron and aluminum from high-iron bauxite by ammonium sulfate roasting and water leaching[J]. Journal of Iron and Steel Research International, 2019, 26(6): 578-584.
2019, Vol. 26 
