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Graphitized wetable cathode carbon block for aluminium electrolysis bath and production method thereof

A technology of cathode carbon block and aluminum electrolytic cell, which is applied in the direction of presses, material forming presses, manufacturing tools, etc., can solve the problems that it is difficult to meet the requirements of cathode carbon conduction and heat conduction, and achieve good resistance, good conduction and heat conduction, Good electrical and thermal conductivity

Inactive Publication Date: 2008-04-09
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, the matrix of the wettable cathode carbon block of the composite layer is an ordinary cathode carbon block or a semi-graphite cathode carbon block, which is difficult to meet the electrical and thermal conductivity requirements of the large aluminum electrolytic cell.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The paste ratio of the wettable composite layer is: TiB 2 20%, carbonaceous material 60%, binder 20%.

[0024] TiB 2 The powder purity is 98%; the carbonaceous material is calcined petroleum coke, the particle size is below 2mm; the binder is coal tar pitch.

[0025] TiB 2 Add carbonaceous materials into a container capable of automatic temperature control and heating, and use a stirrer to mix evenly. The bitumen is melted in the heating tank to remove moisture and precipitated impurities. The liquid asphalt is added into a temperature-controlled heating container and stirred evenly. The dry material is mixed evenly in the kneading pot, and the kneading temperature is not lower than 140°C; add the prepared asphalt in proportion, and knead evenly; air the material for 3 to 5 minutes, and keep it warm for later use.

[0026] The carbon block matrix uses calcined petroleum coke as the aggregate and coal tar pitch as the binder. The matrix paste is batched and kneaded...

Embodiment 2

[0028] The paste ratio of the wettable composite layer is: TiB 2 23%, carbonaceous material 53%, binder 24%.

[0029] TiB 2 The powder has a purity of 98%; the carbonaceous material is petroleum coke, and the particle size is below 2 mm; the binder is made of coal tar pitch and coal tar in a ratio of 9:1.

[0030] TiB 2 Add carbonaceous materials into a container capable of automatic temperature control and heating, and use a stirrer to mix evenly. The asphalt is melted in the heating tank, the water and precipitated impurities are removed, and the coal tar is added and stirred. The liquid binder is added into a temperature-controlled heating container and stirred evenly. The dry material is mixed evenly in the kneading pot, and the kneading temperature is not lower than 140°C; add the prepared asphalt in proportion, and knead evenly; air the material for 3 to 5 minutes, and keep it warm for later use.

[0031]In the aggregate of the carbon block matrix, calcined petroleu...

Embodiment 3

[0033] The paste ratio of the wettable composite layer is: TiB 2 30%, carbonaceous material 48%, binder 22%.

[0034] TiB 2 The powder purity is 98%; the carbonaceous material is petroleum coke, the particle size is below 2mm, and the binder is made of coal tar pitch and coal tar in a ratio of 8:2.

[0035] TiB 2 Add carbonaceous materials into a container capable of automatic temperature control and heating, and use a stirrer to mix evenly. The asphalt is melted in the heating tank, the water and precipitated impurities are removed, and the coal tar is added and stirred. The liquid binder is added into a temperature-controlled heating container and stirred evenly. The dry material is mixed evenly in the kneading pot, and the kneading temperature is not lower than 140°C; add the prepared asphalt in proportion, and knead evenly; air the material for 3 to 5 minutes, and keep it warm for later use.

[0036] In the carbon block matrix aggregate, calcined petroleum coke: pitch...

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Abstract

The invention relates to a graphitized wettable cathode carbon block used in an aluminum electrolytic tank and a production method thereof, and is characterized in that the graphitized wettable cathode carbon block consists of a graphitized carbon block matrix and a TiB2 compound layer integrated on the matrix. The production method of the graphitized wettable cathode carbon block is characterized in that when the cathode carbon block is produced through vibration molding, the working surface of the cathode carbon block is integrated with and molded by a TiB2 compound layer; a pressing molded greed block is roasted, leached, graphitized and processed by machine and a graphitized wettable cathode carbon block is prepared. The carbon block matrix of the graphitized wettable cathode carbon block used in the aluminum electrolytic tank of the invention has good electric and heat conductivity, and the TiB2 compound layer integrated and molded on the matrix is roasted and treated by high temperature heat process, thus the compound intensity can be effectively improved, so the graphitized wettable cathode carbon block used in aluminum electrolytic tank has excellent electrolyte corrosion resistance and aluminum liquid scouring resistance as well as good electric and heat conductivity.

Description

technical field [0001] The invention relates to a graphitized wettable cathode carbon block for an aluminum electrolytic cell and a production method thereof. Background technique [0002] In the aluminum electrolytic production process, the performance and quality of the cathode carbon block directly affect the service life of the aluminum electrolytic cell and the technical and economic indicators of electrolytic production. The cathode carbon block is an important part of the lining material of the electrolytic cell, and its consumption is about 70% to 75% of the cathode weight, accounting for about three quarters of the entire cell bottom area. In the aluminum electrolytic production process, the cathode carbon block is built on the innermost layer of the aluminum electrolytic cell to form a part of the reaction molten pool produced by aluminum electrolysis, which is in direct contact with the melt. Since the melt temperature of aluminum electrolysis is 930-1050°C, it i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C3/08
CPCB30B11/022C25C3/08
Inventor 刘风琴罗英涛杨宏杰罗钟生陈开斌
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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