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Method for preparing carbon anode for aluminum

A carbon anode and preparation process technology, applied in the field of preparation of aluminum carbon anode, can solve problems such as air pollution, less sulfur removal, anode resistivity, iron-carbon pressure drop production equipment, etc., to maintain sustainability, The effect of reducing sulfur content and widening the range of resource selection

Inactive Publication Date: 2010-04-28
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because in the production of carbon anodes, the removal of sulfur is very small, and most of the sulfur becomes SO in the electrolysis process 2 emissions, air pollution
At the same time, sulfur has a great impact on the resistivity of the anode, the iron-carbon pressure drop and the production equipment

Method used

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Examples

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Comparison scheme
Effect test

preparation example Construction

[0011] A method for preparing a carbon anode for aluminum, comprising the following steps: selecting low-ash low-sulfur coal with an ash content of less than 3.0% and a sulfur content of less than 0.5%, and calcining it in a calciner (the powdered coal needs to be pelletized first) ), and the final calcination temperature is 1500-2000°C to obtain calcined coal char. Calcined coal coke and calcined high-sulfur coke are blended in proportion, as the raw coke for making carbon anode, the blending ratio is 10% to 80% (the addition ratio of calcined coal coke in the mixture), and the calcined coal coke It is blended with high sulfur coke in the form of powder, small particles or large particles. The rest are carried out according to the conventional production process of the carbon anode to obtain the carbon anode for aluminum.

[0012] The carbon anode manufacturing process reduces the sulfur content of the carbon anode through the blending of low-ash, low-sulfur coal and high-su...

Embodiment 1

[0014] The sulfur content of calcined high-sulfur coke is 4.82%, the ash content of ultra-clean coal is 1.26%, and the sulfur content is 0.09%. The ultra-clean coal is agglomerated by a briquetting machine, dried and then calcined in a calciner with a final temperature of 1800°C to obtain calcined coal char. The calcined coal coke and the calcined high-sulfur coke are blended at a ratio of 50%:50%, and the calcined coal coke is added in the form of powder and small particles. The rest are carried out according to the conventional production process of carbon anode, and the obtained carbon anode product: the sulfur content is 2.52%, and the bulk density is 1.51g / cm 3 , True density 1.99g / cm 3 , resistivity 58μΩm, compressive strength 31.8Mpa, CO 2 The reactive residual rate was 86.4%.

Embodiment 2

[0016] The sulfur content of calcined high-sulfur coke is 3.37%, the ash content of washed low-ash coal is 2.53%, and the sulfur content is 0.21%. The washed low-ash coal is calcined in a calciner with a final temperature of 1550°C to obtain calcined coal coke. The calcined coal char and the calcined high-sulfur coke are blended at a ratio of 15%:85%, and the calcined coal char is added in the form of large particles. The rest are carried out according to the conventional production process of carbon anode, and the obtained carbon anode product: the sulfur content is 2.93%, and the bulk density is 1.54g / cm 3 , True density 2.05g / cm 3 , resistivity 61μΩm, compressive strength 34.3Mpa, CO 2 The reactive residual rate was 82.7%.

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Abstract

The invention discloses a method for preparing a carbon anode for aluminum, in particular to a method for manufacturing the carbon anode for aluminum by utilizing low-ash and low-sulfur coal and high-sulfur coke as raw materials. The method is characterized in that the ash content of lower than 3%, the sulfur content of lower than 0.5%, the coke after calcining the low-ash and low-sulfur coal which is pressed into briquettes and calcined are mixed in petroleum coke during the preparation process, thereby preparing the carbon anode for aluminum. The low-ash and low-sulfur coal and the high-sulfur coke are mixed in the method, thereby reducing the sulfur content in the carbon anode, expanding the resource selection range of the carbon anode for aluminum, being conductive to maintaining the sustainability of production of the carbon anode and reducing the manufacturing cost of the carbon anode.

Description

technical field [0001] A method for preparing a carbon anode for aluminum relates to a method for making a carbon anode for aluminum by using low-ash, low-sulfur coal and high-sulfur coke as raw materials. Background technique [0002] The carbon anode for aluminum electrolysis is made of calcined petroleum coke and coal tar pitch through kneading, molding and high-temperature roasting. Petroleum coke is the main raw material for the production of carbon anodes for aluminum, and about one ton of petroleum coke is needed to produce one ton of carbon anodes. With the rapid development of my country's aluminum industry, the demand for aluminum coke is increasing. The production of carbon anodes for aluminum has higher requirements on the sulfur content of petroleum coke. Because in the production of carbon anodes, the removal of sulfur is very small, and most of the sulfur becomes SO in the electrolysis process 2 emissions, causing air pollution. At the same time, sulfur ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C3/12
Inventor 苏自伟罗英涛赵淋
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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