Method for producing prebaked anode capable of lowering air permeability

A technology of air permeability and prebaked anodes, which is applied in the field of improving the production process of prebaked anodes for aluminum electrolysis, can solve the problems of high absolute value of air permeability of prebaked anodes, reduction of air permeability, numerical fluctuations, etc., to achieve Solve the fluctuation of anode air permeability, improve the air permeability, and improve the effect of filling performance

Inactive Publication Date: 2016-03-02
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to address the shortcomings of the above-mentioned prior art, and to provide a production method for prebaked anodes with reduced air permeability, which can effectively solve the problems of high absolute value and large fluctuation of air permeability of prebaked anodes.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Petroleum coke adopts raw material coupling technology, which is subjected to granulation, batching and homogenization to obtain pre-calcined materials;

[0022] (2) The calcining time of the pre-calcined material in the pot calciner is 36 hours.

[0023] (3) Sieve the calcined coke, which accounts for 34% of the total calcined coke weight, use Raymond mill for grinding, use laser particle size detection system to detect and control the mill online, and produce calcined coke powder; D of coke powder 50 At 50-60 μm, the fine powder with a particle size below 75 μm should account for 55-65% of the mass fraction, and the Bollinger value of the powder is 3000-3500;

[0024] (4) Clean, crush and sieve the residual poles, and select large-particle, high-density, high-hardness residual pole fragments as a supplement for large-size particles; the particle size of large-particle residual pole fragments is 15-5mm, and the true density is >1.55g / cm 3 ;

[0025] (5) Detect t...

Embodiment 2

[0032] (1) Petroleum coke adopts raw material coupling technology, which is subjected to granulation, batching and homogenization to obtain pre-calcined materials;

[0033] (2) The calcining time of the pre-calcined material in the pot calciner is 38 hours.

[0034] (3) Sieve the calcined coke, which accounts for 29% of the total calcined coke weight, use Raymond mill for grinding, use laser particle size detection system to detect and control the mill online, and produce calcined coke powder; D of coke powder 50 At 50-60 μm, the fine powder with a particle size below 75 μm should account for 55-65% of the mass fraction, and the Bollinger value of the powder is 3000-3500;

[0035] (4) Clean, crush and sieve the residual poles, and select large-particle, high-density, high-hardness residual pole fragments as a supplement for large-size particles; the particle size of large-particle residual pole fragments is 15-5mm, and the true density is >1.56g / cm 3 ;

[0036] (5) Detect t...

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PUM

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Abstract

The invention discloses a method for producing a prebaked anode capable of lowering air permeability, and relates to the improvement of the production technology method of the prebaked anode for aluminium electrolysis. The method for producing the prebaked anode capable of lowering the air permeability is characterized by comprising the steps that (1) screening is conducted after calcinations, and screened fine coke powder is subjected to fine grinding again; (2) anode scrap ingredients are added, wherein the diameters of broken anode scraps are 5-15 mm, and the actual density of the broken anode scrapes is larger than 1.55 g / cm<3>; and (3) the specific gravity of green bodies after vibration forming is larger than or equal to 1.64 g / cm<3>. According to the method, calcined coke is partially subjected to fine grinding again, so that the adding and filling performance of the calcined coke is improved, the broken anode scrap diameter and the actual density of the anode scrap ingredients are controlled, the quality of the green bodies is effectively guaranteed, the technical problem that the air permeability in the production of the prebaked anode fluctuates and is high is solved, and the quality of the prebaked anode is improved. The average value of the air permeability of the produced anode is lowered to 0.9 npm from 2.6 npm, and the standard deviation is lowered to 0.4 from 1.863, so that the air permeability of the prebaked anode is greatly reduced.

Description

technical field [0001] The invention discloses a production method of a prebaked anode capable of reducing air permeability, and relates to an improvement of a production process method of a prebaked anode for aluminum electrolysis. Background technique [0002] Anode quality has a direct impact on aluminum electrolysis production. Poor anode quality will increase anode consumption, and more importantly, it will also increase the voltage drop of the anode, increase the amount of carbon slag oxidized and shed from the anode, increase the carbon content of the electrolyte, increase the temperature of the electrolytic cell, decrease the current efficiency, and reduce the power consumption. Therefore, the increase in production cost of aluminum electrolysis is greater than the increase in production cost due to poor anode quality. Therefore, improving the quality of anodes and reducing anode consumption is the purpose of anode manufacturers and electrolytic aluminum plants [...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C3/12
Inventor 孙丽贞陈开斌罗英涛
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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