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Casting nickel-magnesium-iron composite spinel brick used for aluminum electrolytic cell side wall and preparation method thereof

A technology of aluminum electrolytic cell and spinel brick, which is applied in the field of fused-cast nickel-magnesium-iron composite spinel brick for the side wall of aluminum electrolytic cell and its preparation, which can solve the problem of poor oxidation resistance and electrolyte corrosion resistance, which restricts aluminum electrolysis The application and development of new technology cannot meet the problems of stable maintenance of the electrolytic cell, and achieve the effects of excellent oxidation resistance, improved electrolyte corrosion resistance, and excellent corrosion resistance

Inactive Publication Date: 2018-01-23
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this case, because there is not a large amount of heat quickly dissipated through the side wall, the furnace side cannot be formed on the surface of the side wall. If silicon nitride and silicon carbide are still used as the side wall material, it will directly contact the molten electrolyte and oxidizing gas. touch
Since Si 3 N 4 Combined with the SiC side wall material, the apparent porosity is high and the oxidation resistance is poor. Without the protection of the furnace side, it will react with the oxidizing gas in the electrolytic cell to form SiO 2 ; SiO 2 React with highly corrosive high-te

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A fused-cast nickel-magnesium-iron composite spinel brick for the side wall of an aluminum electrolytic cell and a preparation method thereof. The preparation method described in this embodiment is:

[0031] Step 1, with 75~79wt% iron oxide powder, 13~16wt% magnesium oxide powder and 6~9wt% nickel oxide powder as raw materials, plus the copper oxide powder of 1.0~1.4wt% of the raw materials and 0.5~1.0 wt% cobalt oxide powder, and stir evenly to obtain mixed powder.

[0032] Step 2. Put the mixed powder into the electric arc furnace, first raise the temperature to 1830~1840°C, and keep it warm for 60~65 minutes; then raise the temperature to 2130~2140°C, and keep it warm for 25~28 minutes; The time interval of the second oxygen blowing is 20~24 minutes, the insertion depth of the oxygen lance is 250~280mm below the solution surface, the oxygen blowing amount is carried out under the condition of 4.0~4.5 atmospheric pressure, and the time of the two oxygen blowing is 2....

Embodiment 2

[0036] A fused-cast nickel-magnesium-iron composite spinel brick for the side wall of an aluminum electrolytic cell and a preparation method thereof. The preparation method described in this embodiment is:

[0037] Step 1, with 79 ~ 83wt% iron oxide powder, 10 ~ 13wt% magnesium oxide powder and 6 ~ 9wt% nickel oxide powder as raw materials, plus the copper oxide powder of 1.3 ~ 1.7wt% of the raw materials and 0.9 ~ 1.4 wt% cobalt oxide powder, and stir evenly to obtain mixed powder.

[0038]Step 2: Put the mixed powder into the electric arc furnace, first raise the temperature to 1835~1845°C, and keep it warm for 63~68 minutes; then raise the temperature to 2140~2150°C, keep it warm for 27~30 minutes; The time interval of the second oxygen blowing is 22~26 minutes, the insertion depth of the oxygen lance is 270~300mm below the solution surface, the oxygen blowing volume is carried out under the condition of 4.3~4.8 atmospheric pressure, and the time of the two oxygen blowing ...

Embodiment 3

[0042] A fused-cast nickel-magnesium-iron composite spinel brick for the side wall of an aluminum electrolytic cell and a preparation method thereof. The preparation method described in this embodiment is:

[0043] Step 1, with 83 ~ 87wt% iron oxide powder, 7 ~ 10wt% magnesium oxide powder and 6 ~ 9wt% nickel oxide powder as raw materials, plus the copper oxide powder of 1.6 ~ 2.0wt% of the raw materials and 1.3 ~ 1.8 wt% cobalt oxide powder, and stir evenly to obtain mixed powder.

[0044] Step 2: Put the mixed powder into the electric arc furnace, first raise the temperature to 1840~1850°C, and keep it warm for 65~70 minutes; then raise the temperature to 2150~2160°C, keep it warm for 29~32 minutes; The time interval of the second oxygen blowing is 24~28 minutes, the insertion depth of the oxygen lance is 290~320mm below the solution surface, the oxygen blowing volume is carried out under the condition of 4.6~5.1 atmospheric pressure, and the time of the two oxygen blowing ...

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Abstract

The invention relates to a casting nickel-magnesium-iron composite spinel brick used for aluminum electrolytic cell side walls and a preparation method thereof. Through the technical scheme, the preparation method comprises the following steps: taking 75wt% to 87wt% of a ferric oxide powder, 7wt% to 16wt% of a magnesium oxide powder and 6wt% to 12wt% of a nickel oxide powder as raw materials, additionally adding 1.0wt% to 3.0wt% of a copper oxide powder and 0.5wt% to 2.0wt% of a cobaltous oxide powder as raw materials, stirring uniformly, putting the raw materials into an electric arc furnace,preserving the temperature at 1830 to 1870 DEG C for 60 to 80 minutes, and preserving the temperature at 2130 to 2170 DEG C for 25 to 35 minutes; then blowing oxygen twice, wherein the time intervalof oxygen blowing twice is 20 to 30 minutes, and oxygen blowing is maintained for 2.0 to 4.0 minutes under 4.0 to 6.0 atmospheric pressures; when the temperature of the furnace is decreased to be 1850to 1890 DEG C, pouring and repouring, wherein the time interval of pouring and repouring is 6 to 14 minutes; then annealing for 7 to 12 days in a tunnel kiln, and taking out of the kiln at the temperature of 35 to 75 DEG C so as to obtain the casting nickel-magnesium-iron composite spinel brick used for the aluminum electrolytic cell side walls. The prepared product is low in apparent porosity, good in oxidation resistance, excellent in electrolyte osmosis resistance and good in erosion resistance.

Description

technical field [0001] The invention belongs to the technical field of composite spinel bricks for side walls of aluminum electrolytic cells. Specifically relates to a fused-cast nickel-magnesium-iron composite spinel brick for the side wall of an aluminum electrolytic cell and a preparation method thereof. Background technique [0002] The side wall material in the aluminum electrolytic cell determines the stability and service life of the aluminum electrolytic cell. The side wall of the traditional aluminum electrolytic cell uses Si with high thermal conductivity 3 N 4 Combined with the SiC material masonry, a large amount of heat is quickly dissipated through the side wall material during the electrolysis process, so that a protective solidified electrolyte layer is formed on the surface, that is, the furnace side. The formation of the furnace side avoids the direct contact of the side wall material with the oxidizing gas and the highly corrosive molten electrolyte, so...

Claims

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Application Information

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IPC IPC(8): C04B35/26C04B35/653C25C3/08
Inventor 徐义彪李亚伟桑绍柏王庆虎
Owner WUHAN UNIV OF SCI & TECH
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