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Research of Physical Fields in Inert-Anode Aluminum Reduction Cell

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Tutor: Li
School: Central South University
Course: Non-ferrous metallurgy
Keywords: Aluminum electrolytic,Inert anodes,Physical field,Numerical Simulation,Optimizat
CLC: TF821
Type: PhD thesis
Year:  2009
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Abstract:
Aluminum reduction cell the aluminum core equipment, its development and progress on behalf of the aluminum smelting process innovation. Traditional aluminum electrolytic process has been in use consumable carbon anode, resulting a series of questions, the inert anode electrolytic new technology to solve these problems and become the focus of research of the international aluminum industry to carry out the inert anodes in aluminum reduction cell design The research has a very important significance. This paper, in order to meet the demand on the building to expand to the test with a (5kA level) inert anodes in aluminum reduction cell \anode aluminum reduction cell simulation of physical field. The main results are as follows: (1) in the full study cermet inert anode replace the existing carbon anode electrolyzer significant changes in structure and process parameters on the basis of inert anodes in aluminum reduction cell electro - magnetic - heat - flow - stress-physics simulation methods and procedures. Proven that this method is reasonably practicable, convergence, high accuracy, and provides technical support for the development of inert anodes in aluminum reduction cell. (2) for our group developed a deep cup cermet inert anodes in-depth study of the distribution and evolution of the thermal stress. The calculation results show that: the compressive stress acting on the most area of ??the anode, the anode and the electrolyte and the air of the contact phase at the interface there is a larger axial tensile stress is the main reason for the rupture of the anode; optimize the parameters of the anode structure, an anode immersed in an electrolyte in depth as well as the electrolysis process parameters (including an anode current density and the electrolysis temperature, etc.) can reach the purpose of mitigation anode thermal stress, for example, appropriate to increase the height of the anode, the anode hole depth, and the decrease in the pore radius, the depth of the anode immersed in the electrolyte and reduce the electrolysis temperature can reduce the the anode thermal stress. (3) for the aluminum reduction cell melt flow field (ie flow field) flow field simulation methods (especially the relatively complex structure of the inert anode flow field around) simulation results are poor, the aluminum reduction cell quasi-phase flow simulation method. By gas effect is equivalent to the volume force, the complex electrolyte - liquid aluminum - bubble-phase flow calculation into a multi-step two-phase flow, which can be achieved in the flow field of gas and electromagnetic force under the action of electrolyte and aluminum coupling. The application of the method of inert anodes in aluminum reduction cell flow field simulation calculations show that the depth of anode immersed in the electrolyte and electrolytic process parameters can be achieved by optimizing the parameters of anode structure, optimize the electrolyte and aluminum purpose of the flow field. (4) 5kA variety of the inert anode aluminum reduction cell structure prototype to study the field distribution of the electric field, thermal stress, electromagnetic field, the flow field and other physical characteristics of the electrolyzer. Comparative analysis showed that the six anode electrolytic cell of an anode group than eight anode for an anode group of electrolyzer has better physical field distribution, suitable electrolyzer uses. Based on this simulation superheat and current intensity 5kA level of inert anodes in aluminum reduction cell physical field, these conclusions provide technical support for the construction and testing of inert anodes.
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