Method for producing semi-graphite prebaked anode

A technology of prebaked anode and production method, which is applied in the field of direct production of semi-graphite prebaked anode, can solve the problems of high consumption of primary aluminum unit anode, increased production cost of primary aluminum, poor thermal shock resistance, etc., and achieves low oxidation activity, The effect of low resistivity, good thermal shock resistance

Inactive Publication Date: 2004-03-31
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] At present, the raw materials used in the production of prebaked anode carbon blocks are calcined petroleum coke, residual poles, and coal tar pitch. This kind of prebaked anode carbon blocks has high resistivity, high oxidation activity, poor thermal shock resistance, and oxidation consumption during electrolysis High, high anode consumption per unit of primary aluminum, greatly increasing the production cost of primary aluminum

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Control the semi-graphitized petroleum coke content (percentage by weight) in the prebaked anode paste to 30%, and add it in the form of particles; the content of the residual electrode is 15%, and add it in the form of particles; the calcined petroleum coke content is 39.5%, and add it in the form of powder ; Medium-temperature coal tar pitch is used, and the dosage is 15.5%; the kneading temperature is 155°C, the molding temperature is 140°C, and the roasting temperature is 1100°C. The ash content of the semi-graphite prebaked anode produced is 0.31%, the resistivity is 42.6μΩm, CO 2 Response factor 32.4mg / cm 2 h.

Embodiment 2

[0019] Control the content (percentage by weight) of artificial graphite in the prebaked anode paste to 30%, and add it in the form of powder; the content of residual electrode is 10%, and add it in the form of particles; the content of calcined petroleum coke is 43.5%, and it is added in the form of particles and powder Addition; modified coal tar pitch is used, and the dosage is 16.5%; the kneading temperature is 180°C, the molding temperature is 150°C, and the roasting temperature is 1150°C. The ash content of the semi-graphite prebaked anode produced is 0.48%, the resistivity is 43.7μΩm, CO 2 Response factor 33.6mg / cm 2 h.

Embodiment 3

[0021] Control the semi-graphitized petroleum coke content (percentage by weight) in the prebaked anode paste to be 20%, add in the form of powder; 20% of artificial graphite crushed content, add in the form of particles; calcined petroleum coke content 44%, in the form of particles, It is added in the form of powder; high-temperature coal tar pitch is used, the dosage is 16%, the kneading temperature is 160°C, the molding temperature is 150°C, and the roasting temperature is 1150°C. The ash content of the semi-graphite prebaked anode produced is 0.37%, the resistivity is 40.6μΩm, CO 2 Response factor 30.1mg / cm 2 h.

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PUM

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Abstract

A method of producing prebaking semi-graphite anodes comprises: cracking-screening-blending-pugging-molding-baking. It is characterized in, after the middle forging, the prebaking anode thickener contains( by weight), 20úÑ-50úÑ petrolatum coke, 0úÑ-50úÑ semi-graphite petrolatum coke or graphite petrolatum coke, 0úÑ-40úÑ man-made graphite, 14úÑ-20úÑ coal pitch, 0úÑ-20úÑ stub, ash below 1%; puggingis at 140degree C-180degree C, molding is at 130degree C-150degree C, baking is at 1050degree C-1250degree C. The prebaking semi-graphite anode has a low resistance and a low oxidization activity, excellent performance of resisting heat and shock.

Description

technical field [0001] The invention relates to a production method of a semi-graphite prebaked anode, in particular to directly produce a semi-graphite prebaked anode by using calcined petroleum coke, semi-graphitized petroleum coke, fully graphitized petroleum coke, artificial graphite chips, coal tar pitch and residues as raw materials. The method of baking the anode. Background technique [0002] At present, the raw materials used in the production of prebaked anode carbon blocks are calcined petroleum coke, residual poles, and coal tar pitch. This kind of prebaked anode carbon blocks has high resistivity, high oxidation activity, poor thermal shock resistance, and oxidation consumption during electrolysis High, high anode consumption per unit of primary aluminum, greatly increasing the production cost of primary aluminum. With the development of electrolytic cells towards large capacity and automation, increasing the anode current density is an effective way to greatly...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C3/12
Inventor 刘凤琴陈喜平杨宏杰陈开斌苏自伟杨晓佩
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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