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Meeting 2020 TMS Annual Meeting & Exhibition
Symposium Aluminum Reduction Technology
Presentation Title The Rate of HF Formation During Addition of Alumina to Cryolite Melts
Author(s) Karen S. Osen, Dian Mughni Felicia, Christian Rosenkilde, Camilla Sommerseth, Ole Kjos
On-Site Speaker (Planned) Karen S. Osen
Abstract Scope A major contributor to HF gas evolution during aluminium electrolysis is the hydrolysis of alumina water. The objectives of this work were to investigate the kinetics of HF generation, and how water residence time in the atmosphere above the bath influences the HF formation. The HF concentration in the off-gas was measured during additions of alumina to a Na-AlF3 melt (r=2.2). The alumina water release rate upon rapid heating was also measured separately when alumina was added to a hot empty quartz cell. In the molten cryolite experiments, the residence time of the alumina water was varied by changing the nitrogen gas flow rate through the experimental reactor. The HF formation occurred instantly and the rate determining step is the alumina water release rate. For the range in this study, there was no effect of residence time of the gas in the reaction chamber on the amount of HF formed.
Proceedings Inclusion? Planned: Light Metals

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

A Laboratory Study of the HF Generation Potential of Particulate Fluorides from Cell Emissions
Adapting Modern Industrial Operation Parameters in a Standardized Laboratory Cell for Measuring Current Efficiency for Aluminium Deposition, Unexpected Challenges and Lessons Learned
Alumina Concentration Measurements in Cryolite Melts
An Advanced Nonlinear Control Approach for Aluminum Reduction Process
Anodic Incident Detection Through Multivariate Monitoring of Individual Anode Current Signals
Change of Anode Operation Pattern from Single to Double Staircase at Albras
Comparison Between Different Laminated Aluminum Busbars Expansion Joints in Terms of Mechanical Performance and Relative Costs
Demo Retrofit Study of a Chinese Inspired Cell Technology
Development and Application of GP500+ Energy Saving Aluminum Reduction Cell
Development of a Mathematical Model to Simulate Raft Rormation
Efficient Alumina Handling
Electrochemical Behavior of Cu-Al Oxygen-evolving Anodes in Low-temperature Fluoride Melts and Suspensions
Electrolysis of Low-temperature Suspensions: an Update
Fault Detection and Diagnosis of Alumina Feeding System using Individual Anode Current Measurement
Lab Scale Experiments on Alumina Raft Formation
Mass- and Heat Transfer During Dissolution of Alumina
MassTransport by Waves on the Bath Metal Interface in Electrolysis Cell
Measurement System for Fugitive Emissions in Primary Aluminium Electrolysis
Method Development to Estimate Total Low Voltage and High Voltage PFC Emissions
Model Based Approach for Online Monitoring of Aluminium Production Process
Optimization of a Gas Treatment Center Equipped with Extended Surface Bag Filters
Predictive Analytics for Enhancing Productivity of Reduction Cells
Recycling of the Flue Gas from Aluminium Electrolysis Cells
Reducing the Carbon Footprint: Aluminum Smelting with Changing Energy Systems and the Risk of Carbon Leakage
Restart of Shutdown Pots - Troubles, Solutions and Comparison with Normal Pots to Improve Results
Study of Heat Distribution due to Acd Variations For Anode Setting
The Australian Energy Crisis: Its Impact on Domestic Aluminium Smelting and Potential Solutions
The Effect of Hard Grey Scale Deposition on the Wall Heat Flux of a Cold Finger
The Influence of Polarization on the Wetting of Graphite in Cryolite-alumina Melts
The Rate of HF Formation During Addition of Alumina to Cryolite Melts
Toward Minimizing the of Co-evolution of PFC Emission in EGA Smelter
Update on SO2 Scrubbing Applied in Primary Aluminium Smelters
Update on the Abart Gas Treatment and Alumina Handling at the Karm°y Technology Pilot
Utilization of Waste Heat for Pre-heating of Anodes
Validation of QCL CF4 Gas Analyzer for Sensitivity and Selectivity
Validation of the Gravimetric Method to Properly Follow Alumina Dissolution in Cryolithic Bath

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