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Method and structure for improving cathode current density of aluminium-electrolytic cell

An aluminum electrolytic cell and cathode current technology, which is applied in the field of cathode steel rods, can solve the problems of shortening the electrolytic cell, resistance difference, cathode electrochemical corrosion, etc., and achieve the effect of improving the current density distribution, weakening the peak value of the current density, and reducing the current component

Active Publication Date: 2006-10-11
GUIYANG AL-MG DESIGN & RES INST
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Problems solved by technology

In the prior art, the steel rods are all in the shape of a rectangular parallelepiped or a cylinder with a constant cross-section. Since the current enters vertically to the cross-section of the tank during electrolysis and is drawn out from the width direction of the tank cross-section, the difference in resistance between the middle and the sides of the tank results in the cathode The current density distribution of the bottom block has a peak at the edge
The uneven distribution of current density will not only reduce the electric energy efficiency of aluminum electrolysis, but also fully show from the long-term electrolytic cell anatomy that the electrochemical corrosion of the cathode at the position with high current density is serious, which seriously affects the service life of the cathode, which shortens the life of the electrolytic cell.
[0004] Overhaul cycle, increasing operating and maintenance costs

Method used

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  • Method and structure for improving cathode current density of aluminium-electrolytic cell

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Embodiment Construction

[0013] Embodiment of the present invention: when making, the cross section of steel bar (2) can be made into rectangle or circle, the middle section top of steel bar (2) is thickened, is made into large cross-section section (4), steel bar ( The two ends of 2) are made into a small section section (5) with a small section, and a slope-type variable section section (6) is made between the large section section (4) and the small section section (5), and the steel rod (2) The length ratio of the large section section (4), the small section section (5) and the variable section section (6) is 1:1:1, the lower part of the steel bar (2) is on the same straight line, and the large section section (4) The area ratio of the small section (5) is 1.3:1, so that the surface of the steel rod (2) transitions smoothly, and a steel rod groove (3) matching the shape of the steel rod (2) is processed in the cathode bottom block (1) ), steel bar groove (3) can be processed into rectangular double...

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Abstract

This invention discloses an aluminum electrolytic trough cathode current density method and structure, wherein the aluminum electrolytic trough is embed with cathode bottom block with steel bar, when embedding the steel bar into the cathode bottom block, making the steel bar into the shape whose middle section is large, two ends section is small, and the space between large section and small section is used a slope variable cross-section to connect, then embedding the steel bar in cathode bottom block, which can make the resistance at the electrolytic trough middle and border incline to consistent to improve the current disposition of the cathode bottom block and reduce the electrolytic corrosion of the cathode bottom block.

Description

technical field [0001] The invention relates to a method and structure for improving the cathode current density of an aluminum electrolytic cell, which belongs to a cathode steel rod for an aluminum electrolytic cell [0002] technology field. Background technique [0003] In the aluminum electrolytic cell, the carbon cathode bottom block is used as a conductive lining, and the current is led out by the cathode steel rod. In the prior art, the steel rods are all in the shape of a rectangular parallelepiped or a cylinder with a constant cross-section. Since the current enters vertically to the cross-section of the tank during electrolysis and is drawn out from the width direction of the tank cross-section, the difference in resistance between the middle and the sides of the tank results in the cathode The current density distribution of the bottom block has a peak at the edge. The uneven distribution of current density will not only reduce the electric energy efficiency of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C3/08
Inventor 包崇爱黄俊杨溢姚世焕
Owner GUIYANG AL-MG DESIGN & RES INST
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