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Method for preparing aluminum electrolytic carbon anode ingredient

A carbon anode and aluminum electrolysis technology, applied in the field of preparing aluminum electrolytic carbon anode ingredients, can solve the problems of obvious deformation and cracks, low bulk density of roasting blocks, increased cost, etc.

Inactive Publication Date: 2010-05-26
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are some problems in this formula technology, the roasting loss is great, the deformation and cracks are obvious, the volume density of the roasted block is too low, and the cost increases due to the increase in the amount of asphalt

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] In the formula of carbon anode, the usage amount of coarse coke material (15-5mm calcined petroleum coke, purity over 90%) is 7%, the usage amount of coarse residue (15-5mm residual pole, purity over 90%) is 8%, medium coke material (5-0.8mm calcined petroleum coke, purity 60-70%) usage 37%, fine residue (5-0mm anode residue) usage 12%, raw crushed material (raw anode crushed material, particle size 5-0.8mm) ) usage amount is 6%, the usage amount of calcined coke ball mill powder (-0.075mm accounts for 70%) is 30%, and the addition amount of coal tar pitch is 14%. Its carbon anode volume density is 1.54g / cm 3 , compressive strength 52Mpa, resistivity 54.00μΩm, CO 2 The reactive residual rate was 85.3%.

Embodiment 2

[0015] In the formula of carbon anode, the usage amount of coarse coke material (15-5mm calcined petroleum coke, purity over 90%) is 7%, the usage amount of coarse residue (15-5mm residual pole, purity over 90%) is 8%, medium coke material (5-0.8mm calcined petroleum coke, purity 60-70%) usage 27%, fine residue (5-0mm anode residue) usage 12%, raw crushed material (raw anode crushed material, particle size 5-0.8mm ) in an amount of 6%, calcined coke ball mill powder (-0.075mm accounts for 50%) in an amount of 40%, and coal tar pitch in an amount of 15%. Its carbon anode volume density is 1.55g / cm 3 , compressive strength 51Mpa, resistivity 53μΩm, CO 2 The reactive residual rate was 86.6%.

Embodiment 3

[0017] In the formula of carbon anode, the usage amount of coarse coke material (15-5mm calcined petroleum coke, purity above 90%) is 10%, the usage amount of coarse residue (15-5mm residual pole, purity above 90%) is 10%, medium coke material (5-0.8mm calcined petroleum coke, purity 60-70%) usage 34%, fine residue usage 10%, (5-0mm scrap) raw crushed material (raw anode crushed material, particle size 5-0.8mm ) is used in an amount of 6%, the amount of calcined coke ball mill powder (-0.075mm accounts for 60%) is used in an amount of 30%, and the amount of coal tar pitch added is 13%. Its carbon anode volume density is 1.56g / cm 3 , compressive strength 54.00Mpa, resistivity 52.00μΩm, CO 2 The reactive residual rate was 85.4%.

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Abstract

The invention relates to a method for preparing aluminum electrolytic carbon anode ingredients, in particular to the improvement of a method for producing prebraking carbon anodes by aluminum electrolysis. The method is characterized in that when aluminum electrolytic carbon anode ingredients are prepared, the added quantity of ball milling powder is matched with the added quantity of asphalt, wherein, the added quantity of the ball milling powder accounts for 30%-40% of the weight of aggregate, while the added quantity of the asphalt accounts for 13%-15% of the weight of aggregate. By the method for preparing ingredients of the invention, the aggregate is fully filled by powder, and coal asphalt fully infiltrates the aggregate, thereby achieving the purposes of improving carbon anode quality, enhancing the inoxidizability and electric conduction of the carbon anode, and lowering baking scrap rate.

Description

technical field [0001] A method for preparing aluminum electrolytic carbon anode ingredients relates to an improvement of a method for producing prebaked carbon anode by aluminum electrolysis. Background technique [0002] The rapid development of the aluminum industry and the enlargement of electrolytic cells have put forward higher and higher requirements for the quality of prebaked anodes, requiring carbon anodes to have good electrical conductivity, strong oxidation resistance, and good chemical stability. In the production process of aluminum electrolysis, if the quality of the anode is not good, such as low density, high porosity, low mechanical strength, etc., it will cause excessive consumption of the anode in the process of aluminum electrolysis, decrease in conductive area, increase in current density, and heat generation. Increase, the conductivity of the electrolyte decreases, the pressure drop between the anode and the electrolyte increases, and the power consum...

Claims

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Application Information

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IPC IPC(8): C25C3/12
Inventor 许建华罗英涛朱世发陈开斌郭瑞敏
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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