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Meeting 2020 TMS Annual Meeting & Exhibition
Symposium Alumina and Bauxite
Presentation Title Conversion Behavior of Iron-containing Minerals in the Process of Dissolving High-iron Bauxite by Starch Hydrothermal Method
Author(s) Yongfei He, Yiyong Wang, Jidong Li, Xingyuan Wan, Zhe Ning
On-Site Speaker (Planned) Yongfei He
Abstract Scope Abstract: In the process of hydrothermal dissolution of bauxite, reducing agent starch can simultaneously reduce and separate iron oxide. Thermodynamic calculations show that Fe2O3 can be converted to Fe3O4. Fe2O3 will dissolve in alkaline solution to form Fe(OH)4-. The starch can be decomposed under alkaline hydrothermal conditions and form a strong reduction system, and reduce Fe(OH)4- to Fe(OH)3- , Fe(OH)4- reacts with Fe(OH)3- to form Fe3O4, which realizes the directional transformation of hematite to magnetite. It is found that temperature and alkali concentration have a great influence on the hydrothermal reduction of Fe2O3, and the dissolution of aluminum and the reduction process of iron compounds promote each other. The dissolution rate of aluminum is 98.57%, the iron reduction rate is 98.41%, the magnetic separation rate is above 97.0%, and the iron grade is 73.5%.
Proceedings Inclusion? Planned: Light Metals

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

A Digital Refinery Approach to Process Troubleshooting and Improvements
A Review of Comprehensive Utilization of High-iron Red Mud of China
Application of Advanced Oxidative Process for Organic Compounds Removal from Bayer Liquor
Bayer Process Towards the Circular Economy – Metal Recovery from Bauxite Residue
Bayer Process Towards the Circular Economy – Soil Conditioners from Bauxite Residue
Brazilian Bauxite Residue Physical-chemical Characterization and Acidic Neutralization Potential
Conversion Behavior of Iron-containing Minerals in the Process of Dissolving High-iron Bauxite by Starch Hydrothermal Method
Disc Magnetic Separator Applied to the Extraction of Magnetite in Bauxite Residue
Effect of Concentrations and Pressures of CO2 on Calcification-Carbonation Treatment of Bauxite residue
Effects of the Granular Properties of Bauxite Pisolites on the Solid/Liquid Separation in Liquid Fluidized Beds of Classifiers
F-4: Investigation on Heat Resisting Cast Iron Produced Through Carbothermic Reduction of Alumina Residue (Bayer Red Mud)
Impacts of Mineralogy on Soluble Phosphorus Concentrations During Low Temperature Processing of Jamaican Bauxites
Improved Technology of Scandium Recovery from Solutions of Bauxite Residue Carbonation Leaching
Inhibition of Kaolinite Dissolution in Bayer Liquor Through Addition of Lithium
Ionic Effect of NaCl and KCl on the Flotation of Diaspore and Kaolinite using Sodium Oleate as Collector
Mineralogical Assessment of the Solid Phase Obtained on Leaching of Brazilian Red Mud
Quantifying the Effect of Seeds on Gibbsite Crystallization – Mathematical Modelling of Particle Size Distribution
Recovery of Iron from High-iron Bayer Red Mud by Smelting Reduction
The Alumina Technology Roadmap 4.0.

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