Experimental Investigation of Factors Affecting the Electrical Performance of the Stub to Carbon Connection

Molenaar, D.; Kilpatrick, Tony; Montalto, Aurelio

doi:10.1007/978-3-319-65136-1_229

Cited by 3 publications

(3 citation statements)

References 6 publications

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“…These factors lead to an additional electrical resistance, thus a higher production cost. Finally, the extreme conditions of the process can cause large changes in the geometry of the connection leading to an additional energy loss [4]. It is important to consider that the manufacture, operation, maintenance and cleaning of the assembly represent a significant portion of the aluminum production costs [5].…”

Section: Problem Statementmentioning

confidence: 99%

“…This element leads to a premature maintenance of the anode assembly. In 2013, Molenaar et al [4] used a high amperage testing facility to study the impact of deterioration parameters including the change of stub diameter, height and the eccentricity of the stub in the stub hole on anode performance. He concluded that a net increase of more than 50 mV is possible for a deteriorated anode rod fleet.…”

Section: Geometry Modificationsmentioning

confidence: 99%

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Development of a New Approach to Increase the Electrical Performance of Anodic Assemblies

et al. 2015

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The electrical resistance of an electrolytic cell requires a voltage drop of about 4.5 V for a current of 300 kA of which 7% is attributable to the anode assembly. Reducing this voltage drop is one of the most challenging research topics for the aluminum industry. Over the past decades, there has been much research on the minimization of this loss using the same assembly configuration. In this work, a new approach, which consists of inserting elements into the carbon paste during the anode production, was developed. This approach would provide a significant reduction in the voltage drop mainly through the improvement of contact quality and contact surface at the anode connection. Laboratory tests simulating the baking as well as the installation steps of small-scale assembly were carried out to estimate the resistance. The results demonstrate that it is possible to decrease the resistance at the anode connection under the conditions similar to those used by industry.

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Section: Problem Statementmentioning

confidence: 99%

Section: Geometry Modificationsmentioning

confidence: 99%

Development of a New Approach to Increase the Electrical Performance of Anodic Assemblies

et al. 2015

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“…During cast iron solidification, the cast iron pulls away from the stub hole, forming a shrinkage gap that affects the contact voltage drop during cell operation, which is relative to temperature history during solidification. It was reported that poor casting process would result in an increase of the anode voltage drop of about 50 mV [1]. Secondly, the cooling rate has great effects on the final phase and microstructure of the cast iron, affecting the performance of the cast iron, such as ultimate tensile strength (UTS), hardness, and elongation [2,3].…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation on the Transient Temperature Field of Anode Rodding in Aluminium Reduction Cells

Tao

Wang

et al. 2018

Metals

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The temperature field of the anode rodding process is the root of most of problems related to the anode. A 3D transient thermal finite element model was developed, based on ANSYS in this paper. The temperature field of the rodding process was investigated using this model. The results were presented and analyzed in detail, including the transient temperature fields of different components in the anode, the characteristics of the cast iron solidification, and the cooling rate distribution. The conclusions were as follows. When the stub hole was filled up at 10 s, 30% by volume of cast iron was below the liquidus temperature. At 70 s, the cast iron solidified completely. The cast iron close to the stub solidified prior to that close to the carbon. The solidification mode was intermediate-freezing. The solidifying sequence was vertically from bottom to top, indicating that shrinkage cavities were less likely to occur. The temperature of the stub was higher than the carbon, and portion at high temperature was concentrated around the stub hole. The cooling rate during solidification was 4.3 °C s−1 to 43.7 °C s−1, and the gradient on the radial direction was relatively obvious.

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Anode Stub 3D Inspection System

Côté¹,

Gagné²,

Minville³

et al. 2015

Light Metals 2015

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Experimental Investigation of Factors Affecting the Electrical Performance of the Stub to Carbon Connection

Cited by 3 publications

References 6 publications

Development of a New Approach to Increase the Electrical Performance of Anodic Assemblies

Development of a New Approach to Increase the Electrical Performance of Anodic Assemblies

Numerical Simulation on the Transient Temperature Field of Anode Rodding in Aluminium Reduction Cells

Anode Stub 3D Inspection System

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