Microstructural Evolution of Cast Iron Used for Cathode Rodding in Aluminium Electrolysis Cell

2016 ◽  
pp. 1305-1309
Author(s):  
Alireza Hekmat-Ardakan ◽  
Gervais Soucy ◽  
Loig Rivoaland
Keyword(s):  
Cast Iron ◽  
Microstructural Evolution ◽  
Electrolysis Cell ◽  
Aluminium Electrolysis

scholarly journals Long-term heat treatment of collector bars for aluminium electrolysis: impact on microstructure and electrical properties

2020 ◽  
Vol 2 (9) ◽  
Author(s):  
Jonas Hankel ◽  
Sandra Kernebeck ◽  
Friederike Deuerler ◽  
Sebastian Weber
Keyword(s):  
Electrical Conductivity ◽  
Energy Efficiency ◽  
Cast Iron ◽  
Electrical Properties ◽  
Phase Transformations ◽  
Diffusion Processes ◽  
Electrolysis Cell ◽  
Service Temperature ◽  
Aluminium Electrolysis ◽  
The Impact

Abstract In order to identify possible optimizations regarding the electrical energy efficiency of an aluminium electrolysis cell, the impact of service temperature on microstructure and electrical properties of the cell cathode was investigated. The investigations include experiments regarding the chemical composition, especially the content of carbon, the electrical conductivity and the microstructure at selected positions. Thermodynamic calculations were used to estimate local service temperatures and explain phase transformations and formations. It was found that due to the increased service temperature diffusion processes of carbon took place to a particular extent between cast iron and collector bar. As a result, the carbon content in the collector bar changed from 0.06 to 1.05–1.4 wt%, while in the cast iron a reduction from 3.47 to < 1.50 wt% took place. These processes led to isothermal phase transformations and formations, that changed the matrix of the collector bar from austenitic with low content of ferrite to an austenitic matrix accompanied by precipitation of secondary, predominantly allotriomorphic cementite at service temperature. It was then shown that this has a negative effect on collector bar and decreases the electrical conductivity by up to 26 %. It was also discovered that graphite spheroidization within the grey cast iron has a positive effect on its electrical conductivity, which has increased by 52 %. The results provide the basis to gain an understanding of the carbon diffusion related processes within the cathode of an electrolysis cell and reveal further potential to increase the energy efficiency of primary aluminium production.

The Aluminium Electrolysis Cell Heat Balance Challenge Under Low Voltage

2021 ◽  
pp. 413-418
Author(s):  
Changlin Li ◽  
Junqing Wang ◽  
Yunfeng Zhou ◽  
Dengpeng Chai ◽  
Zhirong Shi ◽  
...  
Keyword(s):  
Heat Balance ◽  
Low Voltage ◽  
Electrolysis Cell ◽  
Aluminium Electrolysis

scholarly journals Prediction of Low-Voltage Tetrafluoromethane Emissions Based on the Operating Conditions of an Aluminium Electrolysis Cell

JOM ◽  
2016 ◽  
Vol 68 (9) ◽  
pp. 2472-2482 ◽  
Author(s):  
Lukas Dion ◽  
László I. Kiss ◽  
Sándor Poncsák ◽  
Charles-Luc Lagacé
Keyword(s):  
Low Voltage ◽  
Operating Conditions ◽  
Electrolysis Cell ◽  
Aluminium Electrolysis

Alumina Dissolution Modeling in Aluminium Electrolysis Cell Considering MHD Driven Convection and Thermal Impact

2016 ◽  
pp. 315-319 ◽  
Author(s):  
Benoit Bardet ◽  
Thomas Foetisch ◽  
Steeve Renaudier ◽  
Jacques Rappaz ◽  
Michel Flueck ◽  
...  
Keyword(s):  
Electrolysis Cell ◽  
Thermal Impact ◽  
Aluminium Electrolysis ◽  
Alumina Dissolution

Study on the Thermal Field Distribution of Steel Claws for Anode in Aluminium Electrolysis Cell

2015 ◽  
Vol 1120-1121 ◽  
pp. 1089-1092
Author(s):  
Qing Dong Qin
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Field Distribution ◽  
Thermal Field ◽  
Voltage Drop ◽  
The Other ◽  
Electrolysis Cell ◽  
Aluminium Electrolysis ◽  
Element Analysis ◽  
Anode Carbon

The electricity consuming of aluminium electrolysis cell is affected by the voltage drop of anode steel claws during the aluminium electrolysis course. The resistivity of anode steel claws is affected by the temperature. In the present study, the thermal field distribution of anode steel claws was studied by finite element analysis. The results show that the thermal energy of anode steel claws come from anode carbon blocks and environment. The temperature of steel claws less than 1/3 height is affected by anode carbon blocks, and the other part is affected by surrounding temperature. According the results, the principle of the new anode steel claw design is proposed.

New Observations in Creep Behaviour of Ramming Paste in Aluminium Electrolysis Cell

2012 ◽  
pp. 1331-1336 ◽  
Author(s):  
Sakineh Orangi ◽  
Donald Picard ◽  
Houshang Alamdari ◽  
Donald Ziegler ◽  
Mario Fafard
Keyword(s):  
Creep Behaviour ◽  
Electrolysis Cell ◽  
Aluminium Electrolysis
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