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Meeting 2017 TMS Annual Meeting & Exhibition
Symposium Alumina & Bauxite
Presentation Title Thermodynamic Analysis and Formation Law of Q Phase of Calcium Aluminate Clinker
Author(s) Long Lu, Dongdong Ma, Tianxu Zhang, Bo Wang
On-Site Speaker (Planned) Bo Wang
Abstract Scope The research on lime sintering process to treat low grade bauxite becomes the hotspot, because it can realize dry sintering and decrease the energy consumption. But during the sintering process the existence of MgO, which is trace element and contained in lime, will lead to the phase formation from 12CaO.7Al<SUB>2</SUB>O<SUB>3</SUB> (C<SUB>12</SUB>A<SUB>7</SUB>) to 20CaO.13Al<SUB>2</SUB>O<SUB>3</SUB>.3MgO.3SiO<SUB>2</SUB> (Q phase) whose alumina leaching property is worse than the former. The alumina leaching ratio decreases obviously. The double parameter model is used to calculate the thermodynamic data of the quaternary compound, and the formation law of alumina-containing phases is obtained by Factsage software. The results indicate that low temperature and high lime addition are benefit to the formation of C<SUB>12</SUB>A<SUB>7</SUB>. The Q phase is found in clinker when sintering temperature is 1325℃. The content of Q phase increases obviously when the temperature is higher than 1400℃.
Proceedings Inclusion? Planned: Light Metals

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

A Novel Process of Alumina Production from Low-grade Bauxite Containing Sulfur
Application of Tricalcium Aluminate Instead of Lime for the Recovery of Aluminum in Middle-low Grade Bauxite in Calcification-Carbonization Process
CFB Alumina Calciners - New and Future Generation Opportunities for Green Field Refineries
Characterization and Ore Dressing of Bauxite from Brazil
Characterization of Activated Alumina Production via Spray Pyrolysis
Chemical Alumina Preparation by Using High Alumina Content Fly Ash
Evolutional Development of Alkaline Aluminosilicates Processing Technology
I-1: A Study on Optimization of Processing Parameters for Synthesis of Calcium Hydroaluminosulfate Using Response Surface Methodology
Iron Separation from Bauxite through Smelting-reduction Process
Leaching Behavior of Alumina from Smelting Reduction Calcium Aluminate Slag with Sodium Carbonate Solution
Low Temperature Reduction of Hematite in Red-Mud to Magnetite
New Process Research on Aluminium Production from Non-traditional Aluminum Resource by Microwave Chlorination
Process Optimization for Diaspore Digestion Equilibrium Using Response Surface Methodology
Processing Diasporic Red Mud by the Calcification-carbonation Method
Recovery of Iron-, Titanium-bearing Constituents from Bauxite Ore Residue via Magnetic Separation Followed by Sulfuric Acid Leaching
Research of Flocculants and Dewatering Additives for Filtration of Red Mud
Security Disposal and Comprehensive Utilization of Bauxite Residues
Thermodynamic Analysis and Formation Law of Q Phase of Calcium Aluminate Clinker
Thermodynamic Behavior of Lime Desulfurization in Sodium Aluminate Solution

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