Graphitic cathode carbon block for aluminium electrolytic bath and its producing method

A technology of aluminum electrolytic cells and cathode carbon blocks, which is applied in the field of graphitized cathode carbon blocks, can solve the problems that the performance of carbon blocks cannot be improved through breakthroughs, and achieve good electrolyte erosion resistance, low electrolytic expansion rate, and extended life. Effect

Inactive Publication Date: 2007-11-21
FANGDA CARBON NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Common cathode carbon blocks and semi-graphitic cathode carbon blocks do not undergo graphitization. Due to the limitation of this process, the performance of carbon blocks cannot be improved significantly.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Graphitized cathode carbon block for aluminum electrolytic cells, its raw material ratio (weight percentage) coal tar pitch 23%, petroleum coke 75%, Fe 2 o 3 powder 0.5%, stearic acid 1.5%.

[0035] The particle size composition (percentage by weight) of the dry material is 6-4mm, 20%; 4-1mm, 25%; 1-0.15mm, 15%; ≤0.15mm, 40%.

Embodiment 2

[0037] Graphitized cathode carbon block for aluminum electrolytic cells, its raw material ratio (weight percentage) coal tar pitch 25%, pitch coke 73%, Fe 2 o 3 powder 1.5%, stearic acid 0.5%.

[0038] The particle size composition (percentage by weight) of the dry material is 6-4mm, 10%; 4-1mm, 26%; 1-0.15mm, 19%; ≤0.15mm, 45%.

Embodiment 3

[0040] Graphitized cathode carbon block for aluminum electrolytic cells, its raw material ratio (weight percentage) coal tar pitch 21%, petroleum coke and pitch coke (1:1) 77%, Fe 2 o 3 powder 1%, stearic acid 1%.

[0041] The particle size composition (percentage by weight) of the dry material is 6-4mm, 32%; 4-1mm, 20%; 1-0.15mm, 13%; ≤0.15mm, 35%.

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Abstract

The graphitized cathode carbon block for aluminum electrolytic bath is prepared with material comprising binder 21-25 wt%, petroleum coke and / or asphalt coke 73-77 wt%, Fe2O3 powder 0.5-1.5 wt% and stearic acid 0.5-1.5 wt%, and through graphitizing treatment. The graphitized cathode carbon block has thermal conductivity coefficient as high as 80 W / m.K, and is favorable to heat dissipation of electrolytic bath bottom and especially suitable for use as cathode lining of large electrolytic bath. The graphitized cathode carbon block has electric resistivity lower than 14 microohm.m and is favorable to lowering cathode voltage drop and saving electric energy. In addition, the graphitized cathode carbon block has low electrolytic expansion rate and high electrolyte corrosion resistance and is favorable to prolonging the service life of electrolytic bath.

Description

Technical field: [0001] The invention relates to a graphitized cathode carbon block for an aluminum electrolytic cell. Background technique: [0002] The aluminum electrolytic cell is the main equipment in the aluminum refining industry, and the cathode part of the cell bottom is usually built with carbon blocks. At present, the popular varieties of cathode carbon blocks on the market mainly include ordinary cathode carbon blocks and semi-graphitic cathode carbon blocks. Ordinary cathode carbon blocks are produced from ordinary calcined anthracite (calcined in a rotary kiln or tank furnace, the calcination temperature is about 1300°C). Due to the low calcination temperature, the resistivity of the ordinary cathode carbon blocks made from this is relatively high. , The electrolytic expansion rate is very high, it is easy to be eroded by the electrolyte, and the early damage of the electrolytic cell occurs. At present, except for a few small electrolytic cells that are still ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25C3/08
Inventor 齐仲辉陈杰
Owner FANGDA CARBON NEW MATERIAL CO LTD
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