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Method for reducing horizontal current in molten aluminum of aluminum electrolysis bath

A horizontal current and aluminum electrolytic cell technology, which is applied in the field of reducing the horizontal current of aluminum liquid in aluminum electrolytic cells, can solve the problems that restrict the development of large-scale tanks, the technological progress of the aluminum industry, the carbon block is easily corroded, and the existence of horizontal current in aluminum liquid, etc.

Active Publication Date: 2011-11-09
中铝郑州有色金属研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The large horizontal current in the aluminum liquid will generate electromagnetic force under the action of the magnetic field, which will increase the instability of the electrolytic cell, reduce the current efficiency, and increase the power consumption; the uneven current distribution in the cathode carbon block will cause the carbon block to be easily damaged. Corrosion, reducing tank life
At present, with the enlargement of the electrolytic cell, the increase of the width of the electrolytic cell will lead to the existence of more liquid aluminum horizontal current and the uneven distribution of cathode current
Although the magnetic field of large slots is constantly being optimized, the large increase in horizontal current still restricts the development of large slots and the advancement of aluminum industry technology

Method used

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  • Method for reducing horizontal current in molten aluminum of aluminum electrolysis bath
  • Method for reducing horizontal current in molten aluminum of aluminum electrolysis bath
  • Method for reducing horizontal current in molten aluminum of aluminum electrolysis bath

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Effect test

Embodiment 1

[0031] Such as figure 1 , Figure 5 As shown, the conduction material is laid between the cathode carbon block and the steel rod, and the current conduction material (3) can be laid in various ways as required. Without changing the structure of the carbon block and the steel rod, lay a thin layer of current-conducting material (3) between the carbon block and the steel rod, or first combine it with the steel rod. It can be one or several materials with higher resistivity than the carbon block, or use non-continuously laid insulating materials, which are combined and laid on the outer 1 / 3 or 2 / 3 of the carbon block as required, so as to increase the cathode resistance of this section , to reduce its current flow, thereby reducing the horizontal current in the aluminum liquid.

Embodiment 2

[0033] Such as figure 2 As shown, the conduction material (3) is laid between the cathode carbon block and the steel rod, and the current conduction material (3) can be laid in various ways according to needs. Without changing the structure of the carbon block and the steel rod, lay a thin layer of current-conducting material (3) between the carbon block (1) and the steel rod (2), which can be a material with a resistivity greater than that of the carbon block Or insulating material, laid between the carbon block (1) and the steel rod (2), through the change of the shape of the guide material, its length can be laid from the position of the top of the steel rod or a certain position in the middle to the outlet of the steel rod The electricity is aligned with the edge of the charcoal block. The upper surface of the steel rod completely covers the width of the steel rod, such as Figure 5 As shown, the side part gradually widens from the inside to the outside, or widens i...

Embodiment 3

[0035] Such as Figure 6 , 7 , 8, and 9, the current conduction material (3) is embedded in the carbon block to replace part of the steel rod. As shown in the figure, a material with a lower resistance than the steel rod is used to replace part of the steel rod at the top of the inner end of the steel rod , its length can be less than or equal to the length of the steel rod in the carbon block, its width is the same as that of the steel rod, and its height gradually decreases from the inside to the outside or decreases in steps such as Figure 6 , 7 As shown, the height of the corresponding steel bar material (2) below the flow guide material (3) gradually increases from the inside to the outside, until the height of the steel bar does not change at the place where there is no flow guide material (3) above. The closer the cathode is to the internal resistance, the smaller the electrical conductivity inside the cathode is, so that the current in the aluminum liquid is mor...

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Abstract

The invention relates to a method for reducing horizontal current in molten aluminum of an aluminum electrolysis bath. The method for reducing the horizontal current in the molten aluminum of the aluminum electrolysis bath is characterized in that: partial current guide material (3) is spread at a cathode carbon block (1) or a steel bar (2) or connecting material cathode paste thereof or phosphorus pig iron (4), so that the current in the molten aluminum enters the cathode carbon block relatively uniformly, passes through the steel bar and is released from the side of the electrolysis bath. In the current guide material (3), at least one material or an insulating material composition, the resistivity of which is different from that of the carbon block or the steel bar, is spread at different parts of a cathode as required and can be used for substituting partial carbon block material or steel bar material or combined together with the carbon block material or the steel bar material, and meanwhile, the width, the height or the thickness of the current guide material (3) can be gradually changed in a step shape or a gradual change form by adjusting the shape of the current guide material (3), so that the resistance distribution of the cathode is changed, the current distribution of the cathode is regulated, the horizontal current in the molten aluminum is reduced, the stability of magnetic fluid of the electrolysis bath is increased, the efficiency of the current is improved and the service life of the bath is prolonged.

Description

technical field [0001] A method for reducing the horizontal current of molten aluminum in an aluminum electrolytic cell relates to a method for changing the distribution of cathode current in an electrolytic cell used for aluminum electrolytic production, reducing the horizontal current of the aluminum liquid layer, and improving the stability of the cell. Background technique [0002] In a traditional aluminum electrolytic cell, the current enters the cell downward through the anode, passes through the molten electrolyte and aluminum liquid, reaches the cathode carbon block, and then passes through the carbon block and the confluence horizontally embedded in the cathode carbon block connected by cathode paste or phosphorus pig iron Steel rods come out from both sides of the electrolytic cell and enter the next cell through the cathode busbar. Under this structure, since the current will always flow through the path with the least resistance, the third part of the outlet sid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C3/20
CPCC25C3/16C25C3/20C25C3/08
Inventor 李旺兴杨建红邱仕麟张艳芳王跃勇侯光辉
Owner 中铝郑州有色金属研究院有限公司
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