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Meeting 2016 TMS Annual Meeting & Exhibition
Symposium Aluminum Reduction Technology
Presentation Title The Role of Key Impurity Elements on the Performance of Aluminium Electrolysis - Current Efficiency and Metal Quality
Author(s) Jassim Ali Al-Mejali, Geir Martin Haarberg
On-Site Speaker (Planned) Jassim Ali Al-Mejali
Abstract Scope The behavior of phosphorus and silicon in industrial aluminium cells were investigated. Measurements were carried out in QATALUM cells by analysis of bath and metal after adding of AlPO4, Na3PO4 and SiO2 compounds to the bath. Phosphorus showed to have much longer retention time in the bath than silicon. Start-up and anode effects influence the phosphorus and silicon level in the cells. Data trends showed that the amount of phosphorus decreases with increasing the temperature. The effect of phosphorus on current efficiency was determined by measuring the metal inventory by copper dilution. The results were compared with current efficiency estimated from measuring the sodium concentration in the aluminium. Mass balance for phosphorus was presented. It was found that massive amounts of phosphorus entering the cells were transported with the off-gases to the dry scrubbers. Mass transfer coefficient for silicon was determined. It was found to be 3.1 x 10-5 m/s.
Proceedings Inclusion? Planned: Light Metals Volume

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

A Novel Method for Processing Sodium Reduction Skimming Station Residue
Alcoa STARProbeTM – Update in Further Development for Measuring Cryolite Properties
Alumina Dissolution Modeling in Aluminium Electrolysis Cell Considering MHD Driven Convection and Thermal Impact
Alumina Handling in the Smelter- from Port to Pot
Aluminerie de Bécancour Conditioning Tower Replacement
Analysis and Visualization of Aluminum Reduction Cell Noise Based on Wavelet Transform
Anode Effect Initiation during Aluminium Electrolysis in a Two-compartment Laboratory Cell
Assessing the Role of Smelter Grade Alumina Porosity in the HF Scrubbing Mechanism
Characterization of Bubble Behavior in Aluminum Reduction Cells
Compact GTC Design: Reducing Footprint and Overall Steel Weight
Conception of a “Dream Cell” in Aluminium Electrolysis
Design and Demonstration of an Improved Automated Pot Tapping Method and Equipment
Design, Start-up and Performance of Four Gas Treatment Centers for the Ma’aden Smelter
Detection of Local Cell Conditions Based on Individual Anode Current Measurements
Development, Proof of Concept and Industrial Pilote of the New CHAC Scrubbing Technology : An Innovative Efficient Way to Scrub Sulfur Dioxide
Dynamic Response of Cryolitic Bath and Influence on Cell Heat and Mass Balance with Large Scale Potline Power Shifts
Effect of Carbon Dust on the Electrical Resistivity of Cryolite Bath
Elimination of Lithium from Aluminium Electrolyte by Acid Leaching Method
Enhancing Production Performance by Optimization All Resources at PT INALUM (Persero)
Evaluation of Gas Composition from Laboratory Scale Electrolysis Experiments with Anodes of Different Sulphur Content
Evolution of Crust Breaker Control for DX+ and DX+ Ultra Technologies
Hall-Héroult Cell Simulator: A Tool for the Operation and Process Control
Hydro’s Cell Technology Path towards Specific Energy Consumption below 12 kWh/kg
Impact of the Heat Flux on the Solidification of a Cryolithe Based Bath
Investigation of Sodium Sulfate Additions into Cryolite-Alumina Melts
Management and Performance of the Largest Gas Treatment Centre at EMAL Potline during Major Shutdown of Main Exhaust Fans
Modelling of Metal Flow and Metal Pad Heaving in a Realistic Reference Aluminium Reduction Cell
Numerical Investigation on the Impact of Anode Change on Heat Transfer and Fluid Flow in Aluminum Smelting Cells
On the Importance of Field Validation in the Use of Cell Thermal Balance Modeling Tools
Pilot Test of Aluminum Electrolysis by the NiFe2O4-M Inert Anodes
Polyvalent Impurities and Current Efficiency in Aluminium Cells: A Model Concerning Electrochemical Short Circuiting
QCL-based Perfluorocarbon Emission Monitoring
Recent Developments in Hyper-Dense Phase Alumina Handling Systems
Reduction Operating Experience on Power Shading at Maaden
Rio Tinto AP44 Cell Technology Development at Alma Smelter
SiC in Electrolysis Pots: An Update
Sideledge Facing Metal in Aluminium Electrolysis Cells: Preliminary Modelling Study of Bath Film Formation
Sideledge Facing Metal in Aluminium Reduction Cells: Freezing and Melting in the Presence of a Bath Film
Simulations on the Bath Chemistry Variables using Neural Networks
Sodium in Aluminum Metal of Operating Prebake Cells: Confirmation and New Findings
Studies on Anode Preheating Using Individual Anode Current Signals in Hall-Héroult Reduction Cells
Study on Effect of Al-O-C Compound in Alumina Carbonthermal Reduction
Sustainable Practices in Spent Potlining - an Industrial Ecology Approach
Sustainable Reduction of Anode Effect and Low Voltage PFC Emissions
Technology for Removal of Sulphur Compounds from Gases Generated during Aluminum Production
Technology Research on Decreasing the Aluminum Surface Waves and Reducing the Cathode Voltage Drop in Aluminum Electrolysis Cells
The 'Virtual Battery' – Operating an Aluminium Smelter with Flexible Energy Input
The Challenge to Supply Consistent Alumina Quality to All Pots on the Increasing Longer and Higher Capacity Potlines
The Competitive Adsorption of HF and SO2 on Smelter Grade Alumina
The Impact of Alumina Quality on Current Efficiency and Energy Efficiency in Aluminum Reduction
The Impact of the Cavity on the Top Heat Losses in Aluminum Electrolysis Cells
The LCL&L Process: A Sustainable Solution for the Treatment and Recycling of Spent Potlining
The Performance of Aluminium Electrolysis in a Low Temperature Electrolyte System
The Role of Key Impurity Elements on the Performance of Aluminium Electrolysis - Current Efficiency and Metal Quality
The Successful Implementation of DUBAL DX+ Technology at EMAL
Understanding the Basic Requirements of the Anode Set Modifier
Using Artificial Neural Network to Predict Low Voltage Anode Effect PFCs at the Duct End of an Electrolysis Cell

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