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Meeting 2017 TMS Annual Meeting & Exhibition
Symposium Aluminum Reduction Technology
Presentation Title Chemical Stability of Thermal Insulating Materials in Sodium Vapour Environment
Author(s) Raymond Luneng, Søren N. Bertel, Jørgen Mikkelsen, Arne P. Ratvik, Tor Grande
On-Site Speaker (Planned) Raymond Luneng
Abstract Scope The most typical thermal insulating materials used in the cathode lining in aluminium electrolysis cells are moler, calcium silicate or vermiculite based materials. The thermal insulation is important for the overall thermal and dimensional stability of the cell. A refractory layer protects the thermal insulation layer, but recently it has become important to investigate the chemical stability of these thermal insulating materials. Here we report on the chemical degradation, caused by sodium vapour, of thermal insulating materials in a laboratory test resembling the environments in the cathode lining. The exposed materials were investigated with respect to changes in the microstructure, chemical and mineralogical composition by a combination of optical and electronic microscopy and powder X-ray diffraction. These investigations revealed different reaction patterns for the three materials and the formation of new mineralogical phases were identified. Finally, these findings were compared with chemical reactions with sodium based on computational thermodynamics.
Proceedings Inclusion? Planned: Light Metals

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

Aging of Insulating Linings in Aluminium Electrolysis Cells
Alternative Applications of SPL: Testing Ideas through Experiments and Mathematical Modeling
Application of Multivariate Statistical Process Control with STARprobeTM Measurements in Aluminium Electrolysis Cells
Bauxite Processing via Chloride Route to Produce Chloride Products and Subsequent Electrolysis of Aluminium Chloride to Produce Aluminium Metal
Cathode Wear Based on Autopsy of a Shut down Aluminium Electrolysis Cell
Chemical Stability of Thermal Insulating Materials in Sodium Vapour Environment
Clustering Aluminium Reduction Cells
Co-evolution of Carbon Oxides and Fluorides during the Electrowinning of Aluminium with Molten NaF-AlF3-CaF2-Al2O3 Electrolytes
Detecting, Identifying and Managing Systematic Potline Issues with Generation 3 Process Control
DX+ Ultra – EGA High Productivity, Low Energy Cell Technology
Enabling Efficient Heat Recovery from Aluminium Pot Gas
Fluoride Capture Capacity of SGA: The Interplay between Particle and Pore Size Distribution
Implementation of D18+ Cell Technology at EGA Jebel Ali Smelter
Improving the Understanding of Busbar Design and Cell MHD Performance
Influence of Handling Parameter on Powder Properties
Integrating a New Smelter Supervision HMI in Existing Control Systems at ALBRAS
LES Turbulence Modeling Approach for Molten Aluminium and Electrolyte Flow in Aluminum Electrolysis Cell
Low Energy Consumption Cell Designs Involving Copper Inserts and an Innovative Busbar Network Layout
MHD of Large Scale Liquid Metal Batteries
Minimizing Cathode Voltage Drop by Optimizing Cathode Slot Design
Partial Anode Effect in a Two-Compartment Laboratory Alumina Reduction Cell
Pot Gas Treatment at High Gas Temperatures
Potroom HF Emission Reduction by Anode Inert Tray Technology Performances of ALRO Industrial 1st of Class
Predicting Instability and Current Efficiency of Industrial Cells
Predictive Formula for the Competitive Adsorption of HF and SO2 on Smeltergrade Alumina Used in Dry Scrubbing Applications
Preventive Treatment of Anode Effects Using On-Line Individual Anode Current Monitoring
Reduction in EGA Jebel Ali Potroom GHG Emissions
Retrofit of Damaged Corner Risers by Means of Bolted Connections
Role of Heat Transfer in the Formation of Carbon Oxides in Smelting Cells
Sodium in Aluminium as a Cell Performance Indicator: A Quantitative Framework
SPL Recycling and Re-Processing
Spreading of Alumina and Raft Formation on the Surface of Molten Cryolite
Stability of Chlorides in Cryolitic Electrolyte
Study of Impact of the Anode Slots on the Voltage Fluctuations of Aluminium Electrolysis Cell Using Bubble Layer Simulator
Surviving an Extended Power Outage after a Break Down in the Sub Station
The Successful Implementation of AP40 Technology at Kitimat

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