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Meeting 2016 TMS Annual Meeting & Exhibition
Symposium Alumina & Bauxite
Presentation Title Alkalinity Precipitation Measurement on Carbonation of Bauxite Residue
Author(s) Luis Alves Venancio, José Antonio Souza, Emanuel Negrão Macedo, Fernando Aracaty Botelho
On-Site Speaker (Planned) Luis Alves Venancio
Abstract Scope The alumina production Bayer process generates 0.7 to 2.0 ton of bauxite residue (BR) and an average of 1.0 ton of CO2 per ton of alumina produced. The direct use of exhaust gases to react and reduce the alkalinity of BR may allow a triple gain: improving the storage conditions, opening a range of new applications for BR and sequester from 16 to 102 kg of CO2 per ton of alumina. This paper shows the first results of a lab scale program to measure the effects of adding different percentages of CaO and MgO in order to precipitate the alkalinity on stable compounds. . The inlet and exhaust gases were analyzed. The supernatant and the decanted were analyzed to monitor the amount of stable compounds like dawsonite. The pH of the suspension was monitored during and after the reaction to evaluate the buffer effect.
Proceedings Inclusion? Planned: Light Metals Volume


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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