Preparation method of TiB2 composite layer cathode carbon block

A cathode carbon block and composite layer technology, applied in the direction of electrodes, electrolysis process, electrolysis components, etc., can solve the problems of hard to resist erosion, ineffectiveness, non-receipt, etc., and achieve strong adhesion, no bumps, and sodium absorption The effect of volume reduction

Active Publication Date: 2008-02-06
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the difference in properties between this kind of smear layer and the matrix carbon block, it is too thick to form a stable one, and it is easy to fall off; it is too thin to resist erosion or not work, so it has not received the expected effect, and it has failed one after another.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] With 50L electric heating mixing pot, the mass ratio is 20% TiB 2 Powder, graphite powder with a mass ratio of 63%, coal tar pitch with a mass ratio of 17% SP equal to 85.5°C, and the TiB 2 Dry mix with graphite powder for 20 minutes, add asphalt and then wet mix for 50 minutes, and the mixing temperature is 145°C to prepare a composite material.

[0020] The base material is electrocalcined anthracite as the aggregate, and the paste for the production of cathode carbon block with a powder resistivity of 540μΩm is used. Weigh 1450Kg of the cathode base block paste, place it in a mold box with a length of 3620mm and a width of 560mm and vibrate for 45see with a heavy hammer, lift the heavy hammer, roughen the upper surface with a special small rake, evenly spread 40kg of compound material, put down the heavy hammer again and vibrate for 2min After demoulding, cooling. After 230 hours of heating and roasting, it was released, processed and inspected, and TiB 2 The comp...

Embodiment 2

[0022] With 50L electric heating mixing pot, the mass ratio is 50% TiB 2 powder, mass ratio of 37% graphite powder, mass ratio of 13% epoxy resin for mixing ingredients, first TiB 2 Dry mix with graphite powder for 10 minutes, add epoxy resin and then wet mix for 35 minutes, and the mixing temperature is 165°C to prepare a composite material.

[0023] The base material is electrocalcined anthracite as the aggregate, and the paste for the production of cathode carbon block with a powder resistivity of 540μΩm is used. Weigh 1450Kg of the cathode base block paste, vibrate the heavy hammer for 45sec in a mold box with a length of 3620mm and a width of 560mm, lift the heavy hammer, roughen the upper surface with a special small rake, evenly spread 40kg of compound material, put down the heavy hammer again and vibrate for 2min After demoulding, cooling. After 230 hours of heating and roasting, it was released, processed and inspected, and TiB 2 The composite layer is closely inte...

Embodiment 3

[0025] Use 50L electric heating mixing pot to mix the mixture, TiB 2 The mass ratio is 70%, the mass ratio is 15% of the crushed graphite, and the mass ratio of 15% is equal to the coal tar pitch of 85.5° C. Other parameters and steps are the same as in Example 1. The blank, after cooling, roasting, processing, and inspection, the composite layer and the matrix are integrated, there is no obvious interface, the working surface is flat, and the thickness of the composite layer is about 10mm. It is tested with metal aluminum liquid and the wetting angle is 10-12°. It can be used as electrolysis Wettable cathode blocks for tanks. During processing, the working surface of the product is not processed, and only the remaining five surfaces are processed. The unprocessed working surface is used as the upper surface of the furnace bottom when the furnace is built.

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Abstract

A process for preparing the composite TiB2-graphite carbon block used as the cathode of large aluminium electrolyzer includes such steps as proportionally mixing TiB2 powder, adhesive and graphite powder, adding it to the basic block until the carbon block is shaped, and calcining. Its advantages are low voltage drop on cathode, less electric consumption, and long service life of electrolyzer.

Description

technical field [0001] a TiB 2 A method for preparing a composite layer cathode carbon block, relating to the preparation of a cathode material carbon block for a large aluminum electrolytic cell, especially TiB 2 -The preparation method of graphite composite cathode carbon block. Background technique [0002] During the production process of aluminum electrolysis, due to the reaction between the aluminum liquid and the cathode carbon and the penetration of the sodium generated by the electrochemical reaction in the electrolyte to the carbon lattice, the phenomenon of expansion, swelling, and cracking of the carbon cathode is caused, and the electrolyte melt leaks. , The tank shell is deformed, and the electrolytic tank is damaged in the early stage, which shortens the life of the electrolytic tank and is forced to be overhauled. TiB 2 It is an excellent wettable material for metal aluminum. After the aluminum liquid covers the cathode, a layer of aluminum liquid film is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25C3/08C25B11/12
Inventor 李旺兴刘凤琴杨宏杰
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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