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Extraction of iron and aluminum from high-iron bauxite by ammonium sulfate roasting and water leaching
- Source :
- Journal of Iron and Steel Research International. 26:578-584
- Publication Year :
- 2018
- Publisher :
- Springer Science and Business Media LLC, 2018.
-
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 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.
- Subjects :
- 010302 applied physics
Ammonium sulfate
Materials science
Metallurgy
0211 other engineering and technologies
Metals and Alloys
02 engineering and technology
Activation energy
Hematite
engineering.material
01 natural sciences
chemistry.chemical_compound
Bauxite
Reaction rate constant
chemistry
Mechanics of Materials
visual_art
0103 physical sciences
Materials Chemistry
visual_art.visual_art_medium
engineering
Leaching (metallurgy)
Particle size
021102 mining & metallurgy
Roasting
Subjects
Details
- ISSN :
- 22103988 and 1006706X
- Volume :
- 26
- Database :
- OpenAIRE
- Journal :
- Journal of Iron and Steel Research International
- Accession number :
- edsair.doi...........b1e04511ceb5ef13594a1f9baf1b3485