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Method for mixing and kneading carbon anode paste for aluminum electrolysis

A technology of carbon anode and aluminum electrolysis, which is applied in the fields of metallurgy and chemical industry, can solve problems such as lowering the softening point, and achieve the effect of low implementation cost, simple process operation and environmental protection

Inactive Publication Date: 2012-02-08
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Invention patent "A method for improving the quality of prebaked anodes" [9] (application number: 201010242721.5) This invention relates to a method for improving the quality of anode paste. The technical solution is to add a certain proportion of medium-temperature Asphalt, which reduces the overall softening point of asphalt and improves the fluidity of asphalt. This invention only increases the content of medium-temperature asphalt in the binder, and it does not belong to the change of paste kneading method.
[0005] In summary, in the research on improving the overall quality of the anode by improving the method of anode paste kneading, there is no relevant technology to improve the quality of the anode from the perspective of changing the internal structure of the coal tar pitch layer on the surface of the anode paste by kneading the anode paste.

Method used

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  • Method for mixing and kneading carbon anode paste for aluminum electrolysis
  • Method for mixing and kneading carbon anode paste for aluminum electrolysis
  • Method for mixing and kneading carbon anode paste for aluminum electrolysis

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Take dry material (coarse particle + fine particle + powder) 1.8Kg to make anode as an example:

[0048] 1) Mix 882g of coarse petroleum coke, 378g of fine petroleum coke and 513g of carbon ball mill powder (minus the part added to the coal tar pitch) and bake in an oven at 200°C for 24 hours. Put the dried dry material into a kneading pot at 180°C for 5 minutes.

[0049] 2) put 17% coal tar pitch (369g) into the melting furnace at a temperature of 180°C for 10 minutes, and then add carbon ball mill powder (27g) accounting for 5% of the total amount of carbon ball mill powder into the melted coal tar pitch; Set the stirring speed of the stirrer to 70r / min, and directly add to the kneading pot after stirring for 20 minutes.

[0050] 3) Add the molten mixed coal tar pitch obtained in step 2) to the dried dry material in the kneading pot and wet mix for 15 minutes, and then put the kneaded paste in an oven at a temperature of 145° C. to cool it for 30 minutes.

[0051] 4...

Embodiment 2

[0055] Take dry material (coarse particle + fine particle + powder) 1.8Kg to make anode as an example:

[0056] 1) Mix 882g of coarse-grained petroleum coke, 378g of fine-grained petroleum coke and 486g of dust collection powder (minus the part added to the coal tar pitch) and bake in an oven at 200°C for 24 hours. Put the dried dry material into a kneading pot at 180°C for 5 minutes.

[0057] 2) putting 17% coal tar pitch (369g) into the melting furnace at a temperature of 180°C for melting for 10 minutes, and then adding dust collection powder (54g) accounting for 10% of the total amount of dust collection powder to the melted coal tar pitch; The stirring speed of the stirrer is set to 70r / min, and the stirring time is 20 minutes, and then released to cool and make powder.

[0058] 3) Add the powdered mixed coal tar pitch obtained in step 2) to the dried dry material in the kneading pot and wet mix for 15 minutes, and then put the kneaded paste in an oven at a temperature o...

Embodiment 3

[0063] Take dry material (coarse particle + fine particle + powder) 1.8Kg to make anode as an example:

[0064] 1) Mix 882g of coarse petroleum coke, 378g of fine petroleum coke and 459g of carbon ball mill powder (minus the part added to the coal tar pitch) and bake in an oven at 200°C for 24 hours. Put the dried dry material into a kneading pot at 180°C for 5 minutes.

[0065] 2) putting 17% coal tar pitch (369g) into the melting furnace at 180°C for melting for 10 min, then adding 15% ball mill powder (81g) of the total amount of carbon ball mill powder into the melted coal tar pitch; The stirring speed of the stirrer is set to 70r / min, and the stirring time is 20 minutes, and then directly added to the kneading pot.

[0066] 3) Add the molten mixed coal tar pitch obtained in step 2) to the dried dry material in the kneading pot and wet mix for 15 minutes, and then put the kneaded paste in an oven at a temperature of 145° C. to cool it for 30 minutes.

[0067] 4) Put the ...

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Abstract

The invention relates to a method for mixing and kneading carbon anode paste for aluminum electrolysis. The method comprises the steps of: adding partial powder (namely carbon ball milled powder or dust collection powder of a calcining or intermediate crushing procedure during the production of carbon) in a carbon anode formula to a molten coal tar pitch used as a bonding agent in advance, uniformly stirring, then mixing and kneading with dried materials, forming, and roasting to obtain an anode. The method aims at improving the volume density, true density, compression strength, resistivity,thermal expansibility and other properties of the carbon anode, and has the advantages of low implementation cost, simplicity in operation and cleanness.

Description

technical field [0001] The invention relates to a method for kneading carbon anode paste in aluminum electrolysis industry. The method belongs to the technical field of metallurgy and chemical industry. Background technique [0002] With the rapid development of the aluminum industry, the demand for prebaked anodes is also increasing. As the heart of the aluminum electrolytic cell, the quality and working condition of the carbon anode have a huge impact on whether the aluminum electrolytic production is normal, current efficiency, power consumption, product grade and other economic and technical indicators. The practice of running a large number of aluminum electrolytic cells has proved that 70% of the failures of electrolytic cells are caused by poor quality anodes. Therefore, how to improve the overall quality of the anode is a very important issue. The traditional method to improve the quality of anode is mainly to study the raw materials, formula grading, coal tar pit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C3/12
Inventor 肖劲邓松云吴胜辉赖延清李劼刘业翔
Owner CENT SOUTH UNIV
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