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Method for improving oxidation resistance of carbon anode for aluminum electrolysis

An anti-oxidation, carbon anode technology, applied in the field of industrial catalysis and organic chemicals, can solve the problems of difficult coating, little blocking effect, unevenness, etc., achieve simple and easy preparation methods, improve high-temperature coking value, The effect of improving antioxidant capacity

Active Publication Date: 2016-12-07
GUANGXI QIANGQIANG CARBON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the protective layer of alumina raw material is loose, large and uneven, and the side of the anode is still exposed to the CO generated by the electrolytic reaction. 2 In , the role of reducing excess consumption of anodes due to anodic oxidation is limited
The coating method is also difficult to be successfully applied in industry, mainly because the coating will dissolve in the cryolite molten salt and precipitate impurities that will pollute the aluminum industry
Second, the adhesion between the coating and the carbon material is poor
Most importantly, air and CO 2 It usually diffuses to a depth of 5cm-10cm on the surface of carbon anode for oxidation reaction. Petroleum coke aggregate itself has a porous structure, and a thin coating can only close the pores on the surface, but has little effect on preventing the diffusion reaction.

Method used

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  • Method for improving oxidation resistance of carbon anode for aluminum electrolysis
  • Method for improving oxidation resistance of carbon anode for aluminum electrolysis
  • Method for improving oxidation resistance of carbon anode for aluminum electrolysis

Examples

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Effect test

Embodiment 1

[0029] A method for improving the oxidation resistance of a carbon anode for electrolytic aluminum, comprising the following steps:

[0030] (1) Preparation of modified coal tar pitch: mix coal tar pitch and modified pitch agent A, heat up to 180°C for cross-linking and fusion for 1 min, then lower the temperature after cross-linking and fusion to 90°C, and then add modified pitch Agent B and stirred for 20 minutes, after cooling, the modified coal tar pitch can be obtained and set aside;

[0031] According to parts by weight, 50 parts of coal tar pitch, 5 parts of asphalt modifier A, and 3 parts of asphalt modifier B;

[0032] Wherein, the asphalt modifier A includes 1 part of modified diatomite and 2 parts of modified bentonite in parts by weight;

[0033] Among them, the modified diatomite is calcined at 500°C for 10 minutes, and after cooling, it is crushed by ultrasonic wave until the particle size is 100 mesh;

[0034] Among them, the modified bentonite is mechanically...

Embodiment 2

[0042] A method for improving the oxidation resistance of a carbon anode for electrolytic aluminum, comprising the following steps:

[0043] (1) Preparation of modified coal tar pitch: mix coal tar pitch and modified pitch agent A, heat up to 200°C for cross-linking and fusion for 30 minutes, then lower the temperature after cross-linking and fusion to 90°C, and then add modified pitch Add agent B and stir for 30 minutes, and after cooling, the modified coal tar pitch can be obtained and set aside;

[0044] 85 parts by weight of the coal tar pitch, 15 parts of asphalt modifier A, and 8 parts of asphalt modifier B;

[0045] Wherein, the asphalt modifier A includes 5 parts of modified diatomite and 8 parts of modified bentonite in parts by weight;

[0046] Among them, the modified diatomite is calcined at 600°C for 30 minutes, and after cooling, it can be pulverized by ultrasonic waves until the particle size is 150 mesh;

[0047] Among them, the modified bentonite is mechanic...

Embodiment 3

[0055] A method for improving the oxidation resistance of a carbon anode for electrolytic aluminum, comprising the following steps:

[0056] (1) Preparation of modified coal tar pitch: mix coal tar pitch and modified pitch agent A, heat up to 185°C for cross-linking and fusion for 15 minutes, then lower the temperature after cross-linking and fusion to 100°C, and then add modified pitch Agent B and stirred for 23 minutes, after cooling, the modified coal tar pitch can be obtained and set aside;

[0057] According to parts by weight, 55 parts of coal tar pitch, 8 parts of asphalt modifier A, 4 parts of asphalt modifier B;

[0058] Wherein, the asphalt modifier A includes 2 parts of modified diatomite and 3 parts of modified bentonite in parts by weight;

[0059] Among them, the modified diatomite is calcined at 540°C for 18 minutes, and after cooling, it can be pulverized by ultrasonic waves until the particle size is 120 mesh;

[0060] Among them, the modified bentonite is m...

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Abstract

The invention belongs to the field of industrial catalysis and organic chemicals, and in particular, relates to a method for improving oxidation resistance of a carbon anode for aluminum electrolysis. The method is characterized by comprising the steps of: (1) preparation of modified coal tar pitch; (2) preparation of a prebaked carbon anode raw block; (3) preparation of the carbon anode; (4) sol dipping; and (5) drying: the sol-dipped carbon anode is naturally aired or heated for drying to obtain the carbon anode. The method improves physical properties of aggregates through modifying and mixing raw materials, uses composite sol for further dipping, can effectively fill holes in the surface of the carbon anode, is deeper in filling depth compared with the prior art, can improve the oxidation resistance of the carbon anode, is easy to master a preparation process, is high in feasibility, and is high in popularization value.

Description

【Technical field】 [0001] The invention belongs to the field of industrial catalysis and organic chemicals, in particular to a method for improving the oxidation resistance of a carbon anode for electrolytic aluminum. 【Background technique】 [0002] At present, the production of pure aluminum mainly adopts Hall-Heroult's cryolite-alumina molten salt electrolysis method, and its anode material is a consumable carbon product, which is the "heart" of electrolytic aluminum. Carbon anode consumption is one of the main costs of electrolytic aluminum production, accounting for about 15% of the total cost. In the electrolytic aluminum production process, carbon anode consumption includes electrochemical consumption, chemical consumption and mechanical consumption. Among them, carbon anode and CO 2 The chemical consumption caused by the oxidation reaction with air at high temperature is the main reason for the excessive consumption of the anode, accounting for about 7%-20% of the en...

Claims

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Application Information

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IPC IPC(8): C25C3/12
CPCC25C3/125
Inventor 赵唯皓杨云坤罗高强黄海燕李永锋周勇农增宏
Owner GUANGXI QIANGQIANG CARBON
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