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Meeting 2020 TMS Annual Meeting & Exhibition
Symposium Alumina and Bauxite
Presentation Title Inhibition of Kaolinite Dissolution in Bayer Liquor Through Addition of Lithium
Author(s) Horace OGilvie, James Vaughan, Hong (Marco) Peng
On-Site Speaker (Planned) Horace OGilvie
Abstract Scope With increasing reactive silica in bauxite, sodium hydroxide usage increases due to the precipitation of desilication products in the Bayer process. In this study, we report on how the presence of lithium ions in the Bayer liquor inhibits the dissolution of kaolinite. The inhibition was studied at temperatures ranging from 90-150°C with residence times up to 4 hours. The inhibition effect is attributed to the localised precipitation of LiAl(OH)7.2H2O on the surface of kaolinite. This phenomenon enables a low temperature digestion process to be contemplated, whereby gibbsite is selectively dissolved in the presence of kaolinite, leading to significant savings in sodium hydroxide as well as a low-alkaline bauxite residue. Economic trade-offs between lithium addition rates and sodium hydroxide savings are discussed.
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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