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Artificial furnace material for aluminum electrolytic cell and preparation method thereof

An aluminum electrolytic cell, artificial technology, applied in the field of refractory materials, can solve problems such as poor controllability, unreasonable control of process conditions, affecting the operation stability of aluminum electrolytic cells and technical and economic indicators, etc., to achieve excellent corrosion performance and oxidation resistance excellent effect

Active Publication Date: 2018-07-17
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] This self-generated furnace aluminum electrolytic cell mainly has the following two deficiencies: 1) During the self-forming process of the furnace, once the thermal insulation structure design of the aluminum electrolytic cell, the bath temperature, the aluminum electrolytic system do not match or the process conditions are unreasonable, it is easy to misshapen hearth
Moreover, the shape controllability of this kind of self-generated furnace is poor, and it is difficult to artificially regularize it.
The appearance of deformed furnace will seriously affect the operation stability and technical and economic indicators of the aluminum electrolytic cell; 2) Since the self-generated furnace will continuously solidify and melt during the aluminum electrolytic production process, the material balance and energy balance of the aluminum electrolytic cell will be coupled with each other, It makes the control of aluminum electrolytic cell more difficult

Method used

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  • Artificial furnace material for aluminum electrolytic cell and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Using 30wt.% spinel and 70wt.% MgAlON as raw materials, plus 1wt.% polyvinyl alcohol, mix them uniformly, press molding, pretreat at 800℃ for 4h, and then under nitrogen atmosphere at 1850℃ After sintering at a temperature of 4 hours, the artificial furnace material of the aluminum electrolytic cell is obtained.

[0024] The volume density of the artificial furnace material for the aluminum electrolytic cell obtained in Example 1 is 3.6 g / cm 3 , The apparent porosity is 0.1%, the bending strength is 220MPa, and it can effectively resist the electrolyte penetration and corrosion of the composite material for 2 years.

Embodiment 2

[0026] Take 40wt.% spinel and 60wt.% MgAlON as raw materials, add 1.5wt.% polyvinyl alcohol, mix homogeneously, press and shape, pretreat at 750℃ for 3h, and then under the protection of argon atmosphere, Sintering at a temperature of 1800°C for 3 hours, the artificial furnace material of the aluminum electrolytic cell is obtained.

[0027] The volume density of the artificial furnace material for the aluminum electrolytic cell obtained in Example 2 is 3.56 g / cm 3 , The apparent porosity is 0.6%, the bending strength is 200MPa, and it can effectively resist the penetration and corrosion of the electrolyte to the composite material for 1.8 years.

Embodiment 3

[0029] Using 50wt.% spinel and 50wt.% MgAlON as raw materials, plus 2wt.% polyvinyl alcohol, mix uniformly, press and shape, pretreat at 700℃ for 2h, and then under helium atmosphere protection at 1750 Sintering at a temperature of ℃ for 2h, the artificial furnace material of the aluminum electrolytic cell is obtained.

[0030] The volume density of the artificial furnace material for the aluminum electrolytic cell obtained in Example 3 is 3.5 g / cm 3 , The apparent porosity is 1.5%, the bending strength is 180MPa, and it can effectively resist the electrolyte penetration and corrosion of the composite material for 1.6 years.

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Abstract

The invention relates to artificial hearth materials for an aluminum electrolysis cell and a preparation method of the artificial hearth materials. According to the technical scheme, the preparation method includes: using 30-80wt% of spinel and 20-70wt% of MgAlON as raw materials, adding 1-5wt% of polyvinyl alcohol, well mixing, forming through compression, processing for 1-4 hours under 600-800 DEG C, and sintering for 1-4 hours under 1650-1850 DEG C under inert atmosphere protection or a vacuum environment to obtain the artificial hearth materials for the aluminum electrolysis cell. The prepared artificial hearth materials for the aluminum electrolysis cell is excellent in oxidation resistance and electrolyte erosion resistance.

Description

Technical field [0001] The invention belongs to the technical field of refractory materials, and specifically relates to an artificial furnace material for an aluminum electrolytic cell and a preparation method thereof. Background technique [0002] Industrial aluminum electrolysis production uses cryolite, aluminum fluoride and other fluorides as the main components of the aluminum electrolyte, and the electrolysis temperature is maintained between 910 and 960°C. Therefore, the sidewall materials of the aluminum electrolysis cell need to withstand high temperature and strong corrosion of the melt. erosion. In traditional aluminum electrolysis production, in order to better protect the sidewall materials of the aluminum electrolysis cell, a solidified electrolyte layer (including the furnace side) will be formed around the electrolysis cell for a long period of time (usually about 3 months) after startup. And extending legs), that is, self-generating furnace. [0003] This kind o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25C3/08
CPCC25C3/08
Inventor 吕晓军刘建华李劼赖延清曾小鹏
Owner CENT SOUTH UNIV