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Meeting 2016 TMS Annual Meeting & Exhibition
Symposium Alumina & Bauxite
Presentation Title Leaching Kinetics for Recovering Alumina from Waste Tricalcium Aluminate Generated after Filtration of Bayer's Liquor
Author(s) Balakrushna Padhi
On-Site Speaker (Planned) Balakrushna Padhi
Abstract Scope A study was performed on the leaching kinetics to recover the alumina from Tricalcium aluminate (TCA) generated as waste after removal of suspended red mud particles in the Bayer process by different concentrations of Na2CO3 solution at different temperatures and solid:liquid ratios. The influences of initial sodium carbonate and stirring speed on reaction rate constant were examined and the corresponding apparent activation energy was calculated. The results indicate that the leaching process is a first order reaction, and the reaction rate constant 8.6410-6 mol/(L.m). Optimization of recovery and minimization of Na2CO3 in liquor were studied, and the dissolution rate of TCA and conversion of CaCO3 also increases. The apparent activation energy is 52.86 kJ/mol, and temperature has great influence on the leaching rate of TCA. The leaching rate is controlled by diffusion of reacting reagents in the solid product layer. A higher leaching rate of TCA is obtained by higher temperature and/or lower solid g/l during leaching process.
Proceedings Inclusion? Planned: Light Metals Volume

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

Alkalinity Precipitation Measurement on Carbonation of Bauxite Residue
An Improved Lime Sinter Process to Produce Al2O3 from Low-grade Al-containing Resources
Effect of Different Silica Mineral Compositions on the Digestion Results in Bayer Process
Effect of Lime Addition during Digestion on Stability of Digested Liquor of Diasporic Bauxite
Extraction of Alumina from the Magnetic Separation Tailings Derived from Reductive Roasting of Red Mud
Going FAR (Floating Alumina Refinery)
Industrial Implementation Characteristics of Aluminates Liquor Low-temperature Desilication Technology
Influence Factors of Stirring Speed of Self-stirring Tubular Reactor Used in Bauxite Digestion Process
Investigation of Flotation Behaviors of Refractory High Silica Bauxite
Leaching Kinetics for Recovering Alumina from Waste Tricalcium Aluminate Generated after Filtration of Bayer's Liquor
Reaction Behavior and Conversion of Anatase in Alumina Production Process with Calcification-carbonization Method
Research on Activated Alumina Obtained by Spray Pyrolysis Method
Study on Effective Extraction of Al and Fe from High-iron Bauxite through “Calcification-carbonization” Method
Study on the Influence of Chemical Additives during the Digestion of Bauxite
Sustaining Capital of Alumina Refinery Projects – Important but Unloved
Ways to Improve of Aluminium Content Raw Material Treatment by Sintering Method

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