TY - JOUR
T1 - Extraction of iron and aluminum from high-iron bauxite by ammonium sulfate roasting and water leaching
AU - Tian, Ding
AU - Shen, Xiao-yi
AU - Zhai, Yu-chun
AU - Xiao, Penny
AU - Webley, Paul
PY - 2019/9/4
Y1 - 2019/9/4
N2 - 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 μm. 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.
AB - 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 μm. 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.
KW - Ammonium sulfate
KW - High-iron bauxite
KW - Kinetics
KW - Reaction process
KW - Roasting
UR - http://www.scopus.com/inward/record.url?scp=85070403574&partnerID=8YFLogxK
U2 - 10.1007/s42243-018-0128-x
DO - 10.1007/s42243-018-0128-x
M3 - Article
AN - SCOPUS:85070403574
SN - 1006-706X
VL - 26
SP - 578
EP - 584
JO - Journal of Iron and Steel Research International
JF - Journal of Iron and Steel Research International
IS - 6
ER -