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Meeting 2023 TMS Annual Meeting & Exhibition
Symposium Alumina & Bauxite
Presentation Title Process Simulation with Tertiary Cyclone for Kaolinite Removal from Amazonian Bauxite Reduction in Mineral Processing
Author(s) Allan Suhett Reis, Geraldo Magela Duarte, Eslyn Neves, Geovan Oliveira, Thiago Jatobá
On-Site Speaker (Planned) Allan Suhett Reis
Abstract Scope Bauxite is the main ore for metallic aluminum production, consisting of aluminum and iron oxides and kaolinite, a clay mineral commonly found in Amazonian bauxites, as the main carrier of reactive silica. In the process, due to the small particle size, kaolinite is usually removed by attrition and washing of coarse material followed by desliming using hydrocyclones. In the Bayer process, kaolinite reacts with sodium hydroxide, increasing reagent consumption in the process. Beneficiation process at Mineração Paragominas is based on the separation of coarser fractions with higher gibbsite content from the clay minerals, where kaolinite is more concentrated. The separation takes place in hydrocyclones, equipment that inherently presents a by-pass of fine particles for the underflow, consequently, contaminating the concentrate with kaolinite, increasing the operating cost in the Bayer process. Additional desliming stages were evaluated for a potential increase in kaolinite removal. Industrial surveying campaigns were carried out and mass balances obtained after laboratory characterization and statistical analysis of operational databases. Nageswararao model for hydrocyclones was calibrated and used in tertiary stages simulation. A black-box model was developed for predicting the benefits on bauxite chemical composition. Five routes for bauxite silica reduction were analyzed considering the inclusion of tertiary stages of desliming in cyclones. Process simulations pointed to a potential solution for the reduction of reactive silica in Paragominas’ bauxite, setting tertiary cyclone in fine classification circuit (26” cyclones) as the most attractive solution, with a potential silica reduction of 4.9%, with 0.4% loss in metallurgical recovery of alumina.
Proceedings Inclusion? Planned: Light Metals
Keywords Other

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

Digestion Efficiency Improvement of Gibbsite-boehmite Bauxite
Effect of Thermal Activation Temperature on Pre-desilication of Low-grade Bauxite
Granulometry Impact on Digestion Efficiency and Cost-economics in Alumina Refinery for East Coast Bauxite (INDIA)
Hematite and Anatase Conversion to Magnetic Phases During Reductive Re-digestion of Gibbsitic Bauxite Residue
Improvement Seminars: Continuous Improvement and People´S Engagement to Support the Sustainability
Process Simulation with Tertiary Cyclone for Kaolinite Removal from Amazonian Bauxite Reduction in Mineral Processing
Reduction of GHG Emissions and Increase Operational Reliability using Immersed Electrode Boiler in an Alumina Refinery
Statistical Modelling of Operating Parameters on Bauxite Slurry Hyperbaric Filtration
Steam Grid Stability using Advanced Process Control and Real Time Optimization in an Alumina Refinery
Study of Repeatability and Reproducibility in Analyzes of Available Alumina and Reactive Silica in Bauxites
Turning Bauxite Residue to Metal Adsorption Materials through a Low-cost Approach
Zero Waste Alumina Production

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