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Meeting 2020 TMS Annual Meeting & Exhibition
Symposium Aluminum Reduction Technology
Presentation Title The Effect of Hard Grey Scale Deposition on the Wall Heat Flux of a Cold Finger
Author(s) Daniel Perez Clos, Petter Nekså, Sverre Gullikstad Johnsen, Ragnhild Elizabeth Aune
On-Site Speaker (Planned) Daniel Perez Clos
Abstract Scope A cylindrical cooled probe (cold-finger) has been used to investigate fouling in the off-gas duct located upstream from the gas cleaning system during primary aluminium production. Thermocouples and heat flux sensors allowed for the monitoring of the global and local heat transfer on both the front and rear sides of the probe placed in cross-flow from the off-gas. Hard scale was formed on the front side of the probe whereas loose deposits accumulated on the rear side, causing inhomogeneous fouling resistance along the cold-finger circumference. Additionally, a static pressure-drop monitor system was installed upstream of the probe to monitor the off-gas velocity variations. A model was developed for analysis of the heat transfer data, and identification of different phenomena allowing for deconvolution of the rather oscillating heat transfer patterns. The subsequent analysis of deposit cross-sections was later used to validate the fouling factor derived from the heat transfer analysis.
Proceedings Inclusion? Planned: Light Metals


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
Aluminium Smelter Crust – Phase Distribution and Structure Analysis of Top Zone Layer
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
Influence of Anode Cover Material Particle Size on Its Physical Property and Insulation Performance
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
Numerical Investigation of Flow Field Effect on Ledge Shape in Aluminum Reduction Cell by Coupled Thermo-flow Model
Optimization of a Gas Treatment Center Equipped with Extended Surface Bag Filters
Oxidation Study of Zinc sulfite on the Removal of Sulfur Dioxide from Aluminum Electrolysis Flue Gas by Zinc Oxide
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
Research and Application of Direct Welding Technology on Super Large Section Conductor
Restart of Shutdown Pots - Troubles, Solutions and Comparison with Normal Pots to Improve Results
Status Analysis of Particle Size Distribution and Attrition Index of the Smelter Grade Alumina
Study of Heat Distribution due to Acd Variations For Anode Setting
The Application of the“Intelligent Breaking & Feeding Technology” for Aluminum Pot Line
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 Karmøy 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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