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Meeting 2023 TMS Annual Meeting & Exhibition
Symposium Aluminum Reduction Technology
Presentation Title Evaluation of Methodologies for Assessment of SO3 Concentration in Industrial Off-gas
Author(s) Thor Anders Aarhaug, Ole Kjos, Morten Isaksen, Jan Olav Polden
On-Site Speaker (Planned) Thor Anders Aarhaug
Abstract Scope Assessment of acid dew point in industrial off-gas has become increasingly important with strategies for heat recovery and use of more concentrated gas compositions. Several approaches to acid dew point assessment makes use of glassware not compatible with the high fluoride concentrations found in unfiltered gas. In this work, a new and simplistic approach to acid dew point assessment is evaluated side by side with conventional methodology. The new approach captures SO3 in the gas as sulfate onto solid NaCl trap. Interference from SO2 is avoided since it passes through the NaCl trap unreacted. The trap is then dissolved in water for direct analysis of the by ion chromatography. The importance of isokinetic sampling was evaluated, and no significant difference in results was observed. This suggests that the acid droplets are small. The method is shown to be promising for acid dew point assessment in industrial off-gas.
Proceedings Inclusion? Planned: Light Metals
Keywords Aluminum, Environmental Effects, Process Technology


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Application of Cell Retrofit in GP320 Aluminum Reduction Cell Line
CFD Modelling of Solidification and Melting of Bath during Raft Formation
Dissimilar Results in Restarting Two Different Potlines
Evaluation of Methodologies for Assessment of SO3 Concentration in Industrial Off-gas
Experimental Investigation of the Alumina Cloud During Alumina Injections in Low And High Temperature Conditions
Fundamental Mass Transfer Correlations Based on Experimental and Literature Data
Fundamentals of Pot Ventilation in Aluminum Smelters
Mathematical Modelling of the Desulfurization of Electrolysis Cell Gases in a Low Temperature Reactor
Numerical Investigation of the Thermal, Electrical and Mechanical Behaviour of Aluminum Reduction Cell during Preheating Phase
Potential of Production Al-Si Green Alloys in AP18 Aluminium Reduction Cell
Preheat, Start-up and Early Operation of DX+ Ultra Pots at 500 kA
Recent Improvements to a Mathematical Model Replicating the Wave and Stream at the Bath-metal Interface
Restart of Albras’ Potline 2 – Improving Performance and Changing Paradigms
Simplified 3D MHD Model for Quick Evaluation of Aluminium Electrolysis Cell Design
The Expanded Industrial Pilot of SAMI’s NCCT+ Technology
The SY500 Potline Technology Development

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