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A prebaked anode for electrolytic aluminum

A technology for pre-baked anodes and electrolytic aluminum, applied in the field of carbon anode materials, can solve the problems of high anode consumption per unit of primary aluminum, increased production cost of primary aluminum, poor thermal shock resistance, etc., and achieves low oxidation activity, low resistivity, The effect of good thermal shock resistance

Active Publication Date: 2021-06-29
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the raw materials used in the production of prebaked anodes for aluminum electrolysis are mainly calcined petroleum coke, anode residue and coal tar pitch, of which the coking value of coal tar pitch is less than 60%, resulting in the volume density of prebaked anodes after roasting is generally lower than 1.6g / cm 3 , significantly lower than the volume density of international aluminum prebaked anodes 1.6g / cm 3 The lower bulk density not only makes the resistivity of the prebaked anode higher, the mechanical properties are poor, and the thermal shock resistance is poor, but also leads to high oxidation consumption in electrolysis, high consumption of primary aluminum per anode, and greatly increases the cost of primary aluminum. Cost of production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] An electrolytic aluminum with pre-bake anodes, the composition and weight percentage content of the pre-baked anode in the first embodiment: 50%, secondary focal of 35%, modified coal asphalt; wherein calcination oil The weight percentage by the particle size distribution is: 3mm <φ ≤ 7mm particles 25%, 0.075mm ≤ φ ≤ 3mm particles 50%, φ ≤ 0.075 mm powder 25%; the secondary focus in the component passes the following method Preparation: Put the calcined petroleum coke to the particle size ≤ 0.06 mm; pour the abrasive powder into the mixed pot, stirred at a temperature of 130 ° C, stir for 20 min, then add the temperature of 150 ° C. The total weight of the total weight of 25% of the modified coal asphalt (asphalt softening point is 90 ° C), the temperature is wet at a temperature of 130 ° C, the mixed wet mixing time is 30 min, the paste is complete after the wet mixing, the paste is heat-tie 3 Secondary, the temperature of the sheet is mixed with the mixture, and the paste...

Embodiment 2

[0016] An electrolytic aluminum pre-bake anode, the composition and weight percentage content of the pre-baked anode in this Example 2 are: 52%, secondary coke 33%, modified coal asphalt; in which calcined asphalt The weight percentage of the particle size distribution is: 3mm <φ ≤ 7mm particles 27%, 0.075mm ≤ φ ≤ 3mm particles of 48%, φ ≤ 0.075 mm powder 25%; the secondary focus in the component passes the following method Preparation: Put the calcined petroleum coke abrasion to the particle size ≤ 0.06 mm; pour the abrasive powder into the blended pot, stirred at a temperature of 135 ° C, stir for 30 min, and then add the temperature of 160 ° C. The total weight of the total weight of 26% of the modified coal asphalt (asphalt softening point is 90 ° C), the temperature is wet at a temperature of 140 ° C, the mixed wet time is 40 min, and the paste is hot after the wet mixing. Secondary, the temperature of the sheet is mixed with the mixture, and the paste after the tie is cooled...

Embodiment 3

[0018] An electrolytic aluminum with pre-bake anodes, the composition and weight percentage content of the pre-baked anode in this Example 3 are: 53%, secondary coke by 30%, and 17% of modified coal asphalt; where calcination oil The weight percentage weight of the particle size is: 3mm <φ ≤ 7mm particles 25%, 0.075mm ≤ φ ≤ 3mm particles of 47%, φ ≤ 0.075 mm powder 28%; the secondary focus in the component passes the following method Preparation: Put the calcined petroleum coke to the particle size ≤ 0.06 mm; pour the abrasive powder into the blended pot, stirred at a temperature of 140 ° C, stir for 40 min, then add a temperature of 160 ° C. The total weight of the total weight of 28% of the modified coal bitumen (asphalt softening point is 95 ° C), the temperature is wet at a temperature of 150 ° C, the mixed wet time is 40 min, and the paste is hot after the wet mixing. Secondary, the temperature of the sheet is mixed with the mixture, and the paste after the tie is cooled to t...

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Abstract

The invention relates to a prebaked anode for electrolytic aluminum, the composition of the prebaked anode is calcined petroleum coke, secondary coke and modified coal tar pitch, and the composition of the calcined petroleum coke, secondary coke and modified coal tar pitch The weight percentage content is: calcined petroleum coke 50~65%, secondary coke 30~35%, modified coal tar pitch 15~20%, among which calcined petroleum coke according to the weight percentage of particle size distribution: 3mm

Description

Technical field [0001] The present invention belongs to the technical field of carbon anode material, and is specifically related to pre-bake anodes in aluminum electrolysis production. Background technique [0002] At present, the raw materials used to produce aluminum electrolysis pre-annoyate are mainly calcined petroleum coke, the residual and coal asphalt, where the coal asphalt is less than 60%, resulting in baking the pre-baking anode bulk density in the pre-baking anode mass in general than 1.6 g / cm 3 , Significantly lower than the international aluminum pretaven anode volume density 1.6g / cm 3 Indicators, lower volume density not only makes the resistivity of the pre-baked anode, poor mechanical properties, poor thermal shock resistance, and result in high oxidation in electrolysis, high-aluminum unit anode consumption, greatly increases the original aluminum Cost of production. With the development of the electrolytic cell to the large capacity, the direction of auto...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25C3/12
Inventor 刘占军李国栋张俊鹏郭晓慧
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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