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Meeting 2020 TMS Annual Meeting & Exhibition
Symposium Aluminum Reduction Technology
Presentation Title A Laboratory Study of the HF Generation Potential of Particulate Fluorides from Cell Emissions
Author(s) Jenny Hung, James Metson
On-Site Speaker (Planned) Jenny Hung
Abstract Scope The injection type dry scrubber is the most commonly used technology in the aluminium smelting industry to manage HF emissions. One limitation of this technology is its sensitivity to temperature and humidity. Previous studies of smelter operation data and experimental work have demonstrated a clear link between the increase in temperature and/or humidity and increase in HF concentration in the treated off-gas. In this study, the generation of gaseous HF through a hydrolysis reaction between gas stream humidity and particulate fluorides has been tested under controlled laboratory conditions. The aim is to identify the HF generation potential of various particulate fluoride phases from cell emissions, and to understand the effect of temperature and humidity on the main reactive fluoride material(s). A range of particulate fluorides were tested, including purchased high purity fluorides and laboratory generated materials such as crushed bath and condensed fume. Results to date show the most significant HF generation bath phase to be the condensed fume phase NaAlF4. However, two ferrous fluoride phases which were minor impurities in the lab generated fume were also found to be significant HF generation contributors.
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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