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Preparation method of cathode carbon block set for aluminum electrolytic cell

A cathode carbon block and aluminum electrolytic cell technology, applied in the direction of material forming presses, presses, manufacturing tools, etc., can solve the problems of high iron-carbon contact pressure drop, red steel rods, and damage to the bottom of the electrolytic cell, etc., to achieve Reduce the iron-carbon contact pressure drop, increase the iron-carbon contact area, and reduce the effect of thermal stress damage

Active Publication Date: 2011-08-31
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A common disadvantage of them is that the iron-carbon contact pressure drop is high
In addition, due to the thermal shock and the difference in thermal expansion between the carbon steel and the phosphorus pig iron casting method, cracks on both wings and corners of the cathode carbon block will cause hidden dangers for damage to the bottom of the electrolytic cell in the future.
The carbon paste tamping method has low strength after tamping. During the process of hoisting and placing carbon blocks, the steel rods will fall to varying degrees, resulting in uneven distribution of cathode current during roasting, which will easily make the steel rods red and the electrolytic cell Early damage, etc.
After the steel rod tamping paste is started and roasted and heated in the electrolytic cell, it will shrink volatilely, and the formed porosity is relatively large, which lays a hidden danger for the damage of the electrolytic cell

Method used

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  • Preparation method of cathode carbon block set for aluminum electrolytic cell
  • Preparation method of cathode carbon block set for aluminum electrolytic cell

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Experimental program
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Effect test

Embodiment

[0018] 1. Pretreatment of cathode steel rod: After sand washing or chemical method for rust removal of cathode steel rod, the prepared graphite powder paste (artificial graphite powder 50%-90%, binder 10%-50%, mix well) Apply evenly to the surface of the steel rod.

[0019] 2. Paste kneading: According to the conventional kneading process, the cathode paste is produced.

[0020] 3. Integrated molding: First, a lining template 5 is attached to the end of the mold 1 placed on the vibration platform 6 of the vibration molding machine, and a small groove is opened at the lower part of the lining plate to place and fix the 4 heads of the steel bars. When forming, first lay a layer of paste 3 on the bottom of the mold; (leave a margin for the bottom surface processing), the thickness is 20-50mm, and the weight 2 is lowered for static compaction. Lift the heavy hammer, place the cathode steel rod, and use the steel claw to roughen the rest of the paste surface. The remaining paste ...

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Abstract

The invention discloses a preparing method of cathode coke on the bottom of aluminium electrolytic groove bottom, which is characterized by the following: placing cathode steel bar in the slurry; vibrating; moulding the block inserted by cathode steel bar; sintering; manufacturing mechanically.

Description

technical field [0001] The invention discloses a production method of a cathode carbon block group for an aluminum electrolytic cell, relating to a method for manufacturing a cathode carbon block group used to form the furnace bottom of an aluminum electrolytic cell during the electrolytic aluminum production process. Background technique [0002] The cathode carbon block group is the main material constituting the furnace bottom of the aluminum electrolytic cell. The quality of its production directly affects the technical indicators such as the life of the electrolytic cell and the pressure drop of the furnace bottom. At present, the production process of the cathode carbon block group mainly includes the following two processes: [0003] A. Production of cathode carbon blocks: At present, the cathode carbon blocks used in aluminum electrolytic cells use electric calcined anthracite as the main raw material, adding different amounts of artificial graphite chips, and adding...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25C3/08
CPCB30B11/022
Inventor 刘风琴苏自伟罗英涛
Owner GUIZHOU BRANCH CHINA ALUMINUM IND