Prebaked anode for electrolytic aluminum

A prebaked anode and electrolytic aluminum technology, which is applied in the field of carbon anode materials, can solve the problems of high consumption of raw aluminum per anode, increased production cost of raw aluminum, poor thermal shock resistance, etc., and achieve low oxidation activity, low resistivity, The effect of good thermal shock resistance

Active Publication Date: 2019-05-21
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

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Effect test

Embodiment 1

[0014] A prebaked anode for electrolytic aluminum. The components and weight percentages of the prebaked anode in Example 1 are: calcined petroleum coke 50%, secondary coke 35%, modified coal tar pitch 15%; wherein calcined petroleum coke The weight percentage of coke according to the particle size distribution is: 3mm<Φ≤7mm granular material 25%, 0.075mm≤Φ≤3mm granular material 50%, Φ≤0.075mm powder 25%; the secondary coke in the component is passed the following method Preparation: Grind the calcined petroleum coke to a particle size of ≤0.06mm; pour the ground powder into a kneading pot, stir at a temperature of 130°C for 20 minutes, and then add Zhan powder at a temperature of 150°C 25% of the total weight of the modified coal tar pitch (asphalt softening point is 90 ° C), wet mixing at a temperature of 130 ° C, the wet mixing time of kneading is 30 minutes, after the wet mixing is completed, the paste is hot-rolled in a sheeting machine for 3 The second time, the sheeting...

Embodiment 2

[0016] A prebaked anode for electrolytic aluminum. The components and weight percentages of the prebaked anode in Example 2 are: calcined pitch coke 52%, secondary coke 33%, modified coal tar pitch 15%; wherein calcined pitch The weight percentage of coke according to particle size distribution is: 3mm<Φ≤7mm granular material 27%, 0.075mm≤Φ≤3mm granular material 48%, Φ≤0.075mm powder 25%; the secondary coke in the components is passed the following method Preparation: Grind the calcined petroleum coke to a particle size of ≤0.06mm; pour the ground powder into a kneading pot, stir at a temperature of 135°C for 30 minutes, and then add Zhan powder at a temperature of 160°C Modified coal tar pitch with a total weight of 26% (asphalt softening point is 90°C), wet-mixed at a temperature of 140°C, and the wet-mixing time for kneading is 40 minutes. The second time, the sheeting temperature is the same as the kneading temperature, and the paste after sheeting is cooled and crushed to...

Embodiment 3

[0018] A prebaked anode for electrolytic aluminum. The components and weight percentages of the prebaked anode in Example 3 are: calcined petroleum coke 53%, secondary coke 30%, modified coal tar pitch 17%; wherein calcined petroleum coke The weight percentage of coke according to particle size distribution is: 3mm<Φ≤7mm granular material 25%, 0.075mm≤Φ≤3mm granular material 47%, Φ≤0.075mm powder material 28%; the secondary coke in the components is passed the following method Preparation: Grind the calcined petroleum coke to a particle size of ≤0.06mm; pour the ground powder into a kneading pot and stir at a temperature of 140°C for 40 minutes, then add Zhan powder at a temperature of 160°C Modified coal tar pitch with a total weight of 28% (asphalt softening point is 95°C), wet-mixed at a temperature of 150°C, and the wet-mixing time for kneading is 40 minutes. The second time, the sheeting temperature is the same as the kneading temperature, and the paste after sheeting is ...

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PUM

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Abstract

The invention relates to a prebaked anode for electrolytic aluminum. The prebaked anode is prepared from calcined petroleum coke, secondary coke and modified coal tar pitch in percentage by weight: 50percent to 65 percent of the calcined petroleum coke, 30 percent to 35 percent of the secondary coke and 15 percent to 20 percent of the modified coal tar pitch, wherein based on particle size distribution, the calcined petroleum coke comprises the following components in percentage by weight: 25 percent to 30 percent of granulated materials with phi being greater than 3mm and less than or equalto 7mm, 45 percent to 50 percent of granulated materials with phi being more than or equal to 0.075mm and less than or equal to 3mm and 25 percent to 30 percent of powder with phi being less than or equal to 0.075mm; and the calcined petroleum coke can be replaced by pitch coke, or the calcined petroleum coke can be replaced by a mixture of the pitch coke and the calcined petroleum coke. Materialsare mixed according to the proportion, and the prebaked anode is manufactured by adopting a conventional process. The prebaked anode produced by adopting the conventional process disclosed by the invention has the advantages of being lower in resistivity, higher in volume density and mechanical performance and low in anode consumption, so that reduction on the production cost of primary aluminumcan be facilitated.

Description

technical field [0001] The invention belongs to the technical field of carbon anode materials, and in particular relates to a prebaked anode used in the production process of aluminum electrolysis. Background technique [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 ...

Claims

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Application Information

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Patent Type & Authority Applications(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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