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

A technology of horizontal current and aluminum electrolytic cell, which is applied in the field of reducing the horizontal current of molten aluminum in aluminum electrolytic cells, and can solve problems such as uneven distribution of cathode current, existence of horizontal current in molten aluminum, and easy corrosion of carbon blocks.

Active Publication Date: 2013-03-20
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

Examples

Experimental program
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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

Disclosed is a method for reducing the horizontal current in liquid aluminum in an aluminum reduction cell, comprising: placing a part of current conducting material at a cathode carbon block, or a steel bar, or a connecting material cathode paste thereof, or phosphorus pig iron, and making the current in the liquid aluminum enter the cathode carbon block evenly, pass through the steel bar, and exit from a side portion of the reduction cell. The method provided by the present invention changes the resistance distribution at the cathode, adjusts the current distribution at the cathode, reduces the horizontal current in the liquid aluminum, improves the stability of the magnetic fluid in the reduction cell, improves the efficiency of the current, and extends the service life of the cell.

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 Patents(China)
IPC IPC(8): C25C3/20
CPCC25C3/08C25C3/16
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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