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Composite spinel material for insulation of side wall of aluminium electrolysis cell and preparation method thereof

An aluminum electrolytic cell and spinel technology, which is applied in the field of composite spinel materials for thermal insulation of aluminum electrolytic cell sidewalls and its preparation, can solve the problem of poor oxidation resistance and electrolyte corrosion resistance, poor oxidation resistance, and sidewall insulation. Material damage and other problems, to achieve excellent corrosion resistance, improve grain boundary stability, and promote the effect of aggregate densification

Active Publication Date: 2017-12-15
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since Si 3 N 4 Combined with the poor oxidation resistance of SiC sidewall materials, it will react with oxidizing gases to form SiO in the absence of furnace side protection 2 ; SiO 2 It will react with high-temperature molten electrolyte to generate gaseous SiF 4 , resulting in severe damage to the sidewall material
In addition, Si 3 N 4 Combined with the high preparation cost of SiC materials, it is not suitable for large-scale use as a material for the side wall insulation of aluminum electrolytic cells
[0004] From the above, it can be seen that the side wall of the aluminum electrolytic cell is made of Si 3 N 4 Combined with SiC material, due to its high thermal conductivity, poor oxidation resistance and electrolyte erosion resistance, it can no longer meet the stable maintenance of heat preservation on the inner wall of the aluminum electrolytic cell, and the high manufacturing cost restricts the application of new energy-saving and consumption-reducing processes for aluminum electrolysis. and development

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A composite spinel material for heat preservation of the side wall of an aluminum electrolytic cell and a preparation method thereof. The preparation method described in this embodiment is:

[0032] First, 65-68wt% granular material, 17-20wt% iron oxide fine powder, 5-8wt% zinc oxide fine powder and 8-10wt% α-Al 2 o 3 The fine powder is a mixture, and then add 0.5-1.0wt% manganese monoxide fine powder and 2.5-3.5wt% polyvinyl alcohol to the mixture, stir evenly, shape, and dry; then keep warm at 1350-1400°C After 2-4 hours, the composite spinel material for thermal insulation of the side wall of the aluminum electrolytic cell is obtained.

[0033]The preparation method of the granular material is as follows: 55-59wt% iron oxide fine powder and 41-45wt% zinc oxide fine powder are used as raw materials, and 0.5-1.0wt% vanadium pentoxide fine powder and 2.0 wt% of the raw materials are added. ~3.0wt% polyvinyl alcohol, mixed evenly, pressed and molded, dried, kept at 13...

Embodiment 2

[0036] A composite spinel material for heat preservation of the side wall of an aluminum electrolytic cell and a preparation method thereof. The preparation method described in this embodiment is:

[0037] First, 67-70wt% granular material, 15-18wt% iron oxide fine powder, 6-9wt% zinc oxide fine powder and 7-9wt% α-Al 2 o 3 The fine powder is a mixture, and then add 0.9-1.4wt% manganese monoxide fine powder and 3.4-4.4wt% polyvinyl alcohol to the mixture, stir evenly, shape, and dry; then keep warm at 1380-1430°C After 3-5 hours, the composite spinel material for the side wall insulation of the aluminum electrolytic cell is obtained.

[0038] The preparation method of the granular material is as follows: 57-61wt% iron oxide fine powder and 39-43wt% zinc oxide fine powder are used as raw materials, and 0.9-1.4wt% vanadium pentoxide fine powder and 2.9 ~3.9wt% polyvinyl alcohol, mixed uniformly, pressed into shape, dried, kept at 1330-1380°C for 3-5 hours, cooled in a furnace...

Embodiment 3

[0041] A composite spinel material for heat preservation of the side wall of an aluminum electrolytic cell and a preparation method thereof. The preparation method described in this embodiment is:

[0042] First, 69-72wt% of granular material, 13-16wt% of iron oxide fine powder, 7-10wt% of zinc oxide fine powder and 6-8wt% of α-Al 2 o 3 The fine powder is a mixture, and then add 1.3-1.8wt% manganese monoxide fine powder and 4.3-5.3wt% polyvinyl alcohol to the mixture, stir evenly, shape, and dry; then keep warm at 1410-1460°C After 4-6 hours, the composite spinel material for the side wall insulation of the aluminum electrolytic cell is obtained.

[0043] The preparation method of the granular material is as follows: 59-63wt% iron oxide fine powder and 37-41wt% zinc oxide fine powder are used as raw materials, and 1.3-1.8wt% vanadium pentoxide fine powder and 3.8 ~4.8wt% polyvinyl alcohol, mixed uniformly, pressed into shape, dried, kept at 1360-1410°C for 4-6 hours, cooled...

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Abstract

The invention relates to a composite spinel material for insulation of the side wall of an aluminium electrolysis cell and a preparation method thereof. The technical scheme is that the composite spinel material comprises the procedures of: by adopting 65-75wt% of granule, 10-20wt% of iron-oxide fine powder, 5-15wt% of zinc-oxide fine powder and 5-10wt% of alpha-Al2O3 micropowder as a mixture, adding 0.5-2.0wt% of manganese monoxide and 2.5-5.5wt% of polyvinyl alcohol, stirring, forming, drying, and insulating for 2-8 hours at the temperature of 1350-1550 DEG C to obtain the composite spinel material for insulation of the side wall of the aluminium electrolysis cell. The preparation method comprises the following steps of: byadopting 55-65wt% of iron-oxide fine powder and 35-45wt% of zinc-oxide fine powder as materials, adding 0.5-2.0wt of vanadium pentoxide fine powder and 2.0-5.0wt% of polyvinyl alcohol, mixing, forming, drying, insulating for 2-6 hours at the temperature of 1300-1500 DEG C, cooling and crushing. A product prepared by the invention has the characteristics of low cost, lower heat-conductivity coefficient, good antioxidation property and excellent electrolyte-corrosion resistance.

Description

technical field [0001] The invention belongs to the technical field of composite spinel materials for heat preservation of aluminum electrolytic cells. In particular, the invention relates to a composite spinel material for thermal insulation of the side wall of an aluminum electrolytic cell and a preparation method thereof. Background technique [0002] Si is widely used in the sidewall of the current Hall-Héroult aluminum electrolysis cell 3 N 4 Combined with SiC material masonry. Since Si 3 N 4 Combined with the high thermal conductivity of SiC material, a large amount of heat will be quickly dissipated through the side wall during the electrolysis process, so that a layer of solidified electrolyte—the side wall is formed on the surface of the side wall. Under the protection of the hearth, Si 3 N 4 Combined with SiC sidewall material, it will not be in direct contact with molten electrolyte and oxidizing gas, so a better use effect has been achieved. However, to m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/26C04B35/622
Inventor 徐义彪李亚伟桑绍柏王庆虎
Owner WUHAN UNIV OF SCI & TECH
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