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Carbon prebaked anode

A pre-baked anode and carbon technology, applied in the field of aluminum electrolysis, can solve the problems affecting anode resistivity, strength, and low anode bulk density, and achieve the effects of reducing anode resistivity, reducing resistivity, and increasing contact area.

Inactive Publication Date: 2011-02-16
SNTO TECH GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The study found that when there are many particles > 6mm in the aggregate, the fine material and powder are not enough to fill the gap between coarse particles, which will lead to a low volume density of the anode, thus affecting the technical indicators such as the resistivity and strength of the anode

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Weigh 0.3kg of calcined coke with a particle size of 6-3mm, 1.5kg of calcined coke with a particle size of 3-0mm, and 0.9kg of a 200-mesh powder of calcined coke, that is, 10% of the aggregate with a total weight of 3Kg has a particle size of 6- 3mm calcined coke, 50% 3-0mm calcined coke, 30% calcined coke 200 mesh powder and 10% residual electrode, raw crushed, among which, the purity of the powder is not less than 55%, that is, the particle size of the powder The percentage value of the material with a diameter less than 200 mesh (-0.075mm) in the mass of the powder is not less than 55%.

[0034] Pour the above raw materials into a kneader and knead evenly. After 10 minutes, add 0.53 kg of modified asphalt powder, which is 15% of the total weight of aggregate and asphalt. Knead for another 10 minutes, then heat to 150-200 ° C for 40 minutes Then take it out.

[0035] After the paste was left to stand for 1 hour, it was baked to 200°C, and at the same time, the sample...

Embodiment 2

[0043] Weigh 0.3kg of calcined coke with a particle size of 6-3mm, 1.14kg of calcined coke with a particle size of 3-0mm, and 1.05kg of calcined coke with a 200-mesh powder, that is, 10% of the aggregate with a total weight of 3Kg has a particle size of 6- 3mm calcined coke, 38% 3-0mm calcined coke, 35% calcined coke 200 mesh powder and 7% residual electrode, raw crushed, poured into the kneader and kneaded evenly, after 10 minutes, add modified asphalt powder 0.49kg of asphalt, which accounts for 14% of the total weight of aggregate and asphalt, is kneaded for 10 minutes, then heated to 150°C, and taken out after 40 minutes.

[0044] The firing step is as described in Example 1, and the bulk density of the anode sample obtained in this example is detected to be 1.59 g / cm 3 , the resistivity is 49.27μΩ·m.

Embodiment 3

[0046] Weigh 0.45kg of calcined coke with a particle size of 6-3mm, 1.65kg of calcined coke with a particle size of 3-0mm, and 0.6kg of calcined coke with a 200 mesh powder, that is, 15% of aggregates with a total weight of 3Kg have a particle size of 6- 3mm calcined coke, 55% 3-0mm calcined coke, 20% calcined coke 200 mesh powder and 10% residual electrode, raw crushed, poured into the kneader and kneaded evenly, after 10 minutes, add modified asphalt powder 0.51kg, that is, 14.5% of the total weight of pitch, kneaded for another 10 minutes, then heated to 165°C, and taken out after 40 minutes.

[0047] The firing step is as described in Example 1, and the bulk density of the anode sample obtained in this example is detected to be 1.58 g / cm 3 , the resistivity is 49.82μΩ·m.

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Abstract

The invention discloses a carbon prebaked anode in aluminum electrolysis industry. The aggregate of the carbon prebaked anode comprises calcined coke, residual anode and raw crushed straw, wherein the calcined coke with a particle size ranging from 3 to 6 millimeters accounts for 10 to 20 percent of the total weight of the aggregate, the calcined coke with a particle size ranging from 0 to 3 millimeters accounts for 30 to 55 percent of the total weight of the aggregate and the 200-mesh calcined coke powder accounts for 20 to 35 percent of the total weight of the aggregate. The formula of the anode does not adopt coarse calcined coke like the formula of the conventional carbon prebaked anode and increases the content of the fine calcined coke and 200-mesh calcined coke powder compared with the formula of the conventional carbon prebaked anode, thereby improving the volume density and compression strength of the anode and reduces the resistivity of the anode.

Description

technical field [0001] The invention relates to the technical field of aluminum electrolysis, in particular to a carbon prebaked anode. Background technique [0002] The carbon prebaked anode is located on the upper part of the aluminum electrolytic cell, which is the heart of the aluminum electrolytic cell; it not only undertakes the task of introducing direct current to the electrolytic cell and participating in electrochemical reactions, but also consumes continuously; the quality and working condition of the carbon prebaked anode, It also directly affects the main process technology, production cost and production stability of aluminum electrolytic production. [0003] The preparation process of carbon prebaked anode mainly includes raw material pretreatment, petroleum coke calcination, crushing, screening, batching, binder pretreatment, kneading, paste molding, roasting, assembly and other processes. , Mix the treated aggregates (such as calcined petroleum coke of vari...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C3/12
Inventor 高小明夏春福彭财义刘诚学刘六中
Owner SNTO TECH GRP
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