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Aluminum electrolyzer electrode (variants)

An electrolytic cell and electrode technology, which is applied in the direction of electrodes, electrolysis process, electrolysis components, etc., can solve the problems of cathode weight, high brittleness, poor resistance, etc., achieve reduction of electrode weight, fire resistance and heat resistance, and improve durability Effect

Inactive Publication Date: 2017-12-01
OBSHCHESTVO S OGRANICHENNOY OTVETSTVENNOSTYU OBEDINENNAYA KOMPANIYA RUSAL INZHENERNO TEKHNOLOGICHESKIY TSENTR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Furthermore, molybdenum and tungsten are highly brittle and therefore less resistant to mechanical and shock loads than the well-known structural and heat-resistant steels
Furthermore, due to the high density of molybdenum and tungsten, the cathode will be much heavier, which is undesirable with regard to the material requirements of the cathode and the loads on the structural components of the electrolyser

Method used

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  • Aluminum electrolyzer electrode (variants)
  • Aluminum electrolyzer electrode (variants)
  • Aluminum electrolyzer electrode (variants)

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] Example 1 illustrates a first embodiment of the invention. For the manufacture of aluminum wetted electrodes, 80 mass% Fe-20 mass% TiB with dimensions 94*77*10mm is used 2 A plate of composite material serves as the matrix 2 workpiece. A stainless steel rod used as a current collector was arc welded to the plate. Next, wet the surface of the workpiece with electrodes in a phenol-formaldehyde resin solution with ceramic particles TiB 2 The suspension is covered to produce a surface coating. The covered coating was dried at room temperature for 1 hour, then at 150°C for 1 hour. In this way, a surface coating 3 having a thickness of 1.5 mm and consisting of titanium diboride (93% by mass) and phenolic resin (7% by mass) was formed on the surface of the aluminum wetted electrode.

[0060] FIG. 1(A) schematically illustrates a cross-section of an electrode prepared according to Example 1.

[0061] The samples prepared by this method were tested as vertical cathodes elec...

Embodiment 2

[0063] Example 2 shows a second embodiment of the present invention. For the manufacture of aluminum wetting electrodes, a metal matrix of structural steel St3 with dimensions 100*70*5 mm is used. The metal (steel) base has a shank for welding the metal current collector to it. In a first step, a nickel-iron foam plate with a thickness of 3 mm was brazed to the base body 1 to form an intermediate layer. The specific porosity of nickel-iron foam is 60PPI. In the phenol-formaldehyde resin solution, the porous metal matrix on the surface of the substrate was impregnated with ceramic particles TiB 2 suspension to produce a composite interlayer. In the next step, a layer of the suspension with a thickness of about 1 mm is applied to form a surface coating. In addition, the electrode workpiece having the surface coating applied thereon was dried at room temperature for 1 hour, and then at 150° C. for 1 hour. For coating sintering, samples were fired at 800 °C for 3 h in an acti...

Embodiment 3

[0068] Example 3 is an illustration of a specific variant of the first embodiment according to the invention with surface carburization of a matrix of composite material. For the manufacture of aluminum wetted electrodes, 80 mass% Fe-20 mass% TiB with dimensions 96*81*10mm is used 2 The composite material plate serves as the matrix 2 workpiece. In order to saturate the surface layer 4 of the sample with carbon diffusion, the plate was solid-phase carburized. As carburizing agent, a mixture consisting of 80% charcoal and 20% sodium carbonate was used. The carburizing process lasted 10 hours in a sealed corundum container at 900°C. Then, a stainless steel rod serving as a current collector was arc welded to the composite plate. Next, wet the surface of the workpiece with electrodes in a phenol-formaldehyde resin solution with ceramic particles TiB 2 suspension coverage. The electrode base 2 was dried at room temperature for 1 hour, and then at 150° C. for 1 hour. In this w...

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Abstract

The invention relates to vertical or inclined electrodes of an electrolyzer for electrolytically producing aluminum from aluminum oxide. An electrode contains an electrode base and a surface coating based on refractory ceramics. According to a first variant of the invention, the electrode base is made of a composite material containing between 5% and 90% by mass of refractory ceramics, and of at least one metal having a melting temperature exceeding 1000 DEG C, which forms refractory intermetallic compounds upon interaction with aluminum, and / or containing at least one alloy of such a metal. According to a second variant of the invention, the electrode base is made of a metal alloy, for example structural steel or another alloy, and the surface of the electrode base has applied thereto an intermediary layer consisting of a composite material having the composition described above.

Description

technical field [0001] The present invention relates to a device for the electrolytic production of aluminum from alumina, in particular a vertical or inclined electrode, ie a cathode or the cathodic part of a bipolar electrode, of an electrolytic cell for the electrolytic production of aluminum from alumina dissolved in a molten electrolyte. [0002] The application of vertical or inclined wetted cathodes and bipolar electrodes in new aluminum electrolytic cells can reduce the specific rated power consumption of aluminum production by reducing the anode-to-cathode distance (ACD) between the electrodes and improve on a per footprint basis Electrolyzer performance. The lag in the development of new electrolyzers equipped with vertical or inclined electrodes is especially related to the lack of technical, cost-effective and technically feasible aluminum wetted electrolyzer electrodes that can be used as vertical or inclined wetted cathodes or bipolar electrodes Cathode part. F...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C3/08C22B21/00
CPCC25C3/12C22C19/07C22C32/0073C22C38/00C22C32/0052C22C32/0057C22C1/1026C23C28/00C23C28/04C23C28/042C23C28/048B22F7/008B22F7/08B22F7/004C22C1/047C25C3/08C25B11/043C25B11/055C04B41/51C04B41/88C25C3/125C25C3/18
Inventor D·A·斯马科夫A·O·古谢夫
Owner OBSHCHESTVO S OGRANICHENNOY OTVETSTVENNOSTYU OBEDINENNAYA KOMPANIYA RUSAL INZHENERNO TEKHNOLOGICHESKIY TSENTR
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