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Rapid conductive coating for newly changed anode of aluminum electrolysis cell and coating method thereof

A conductive coating, aluminum electrolytic cell technology, applied in the field of aluminum electrolysis, can solve problems such as slow conduction speed, and achieve the effect of improving conduction speed and enhancing strength

Inactive Publication Date: 2015-03-25
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Aiming at the problems that the conduction speed of the new anode is too slow, the present invention proposes a fast conductive coating for the new anode and a coating method thereof, that is, a layer of fast conductive coating is applied under the new anode to improve the speed of the new anode. The conduction speed of the anode is expected to improve the large fluctuations brought about by the change of poles at low voltage and low superheat to the aluminum electrolytic cell. positive influence

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Embodiment 1 (one-layer structure)

[0031] 1) Add 30% Al 2 o 3 Sol, 15% AlF 3 , 5% LiF, 20% Li 2 CO 3 , 5% carbon fiber, 5% silicon carbide, 10% B 2 o 3 , 10% C powder, mixed evenly at room temperature to prepare coating slurry.

[0032] 2) Anode surface cleaning: transport the assembled anode to the coating coating site, and use high-pressure air to blow the bottom palm of the anode to remove the dust on the bottom palm to ensure that the coating adheres firmly.

[0033] 3) Coat the prepared coating slurry on the bottom palm of the anode, and the coating thickness is about 5-10mm.

[0034] 4) The cured new anode coated with a fast conductive coating is used for electrolysis, and the equidistant pressure drop of the anode guide rod is measured every 10 minutes, and compared with the new anode not coated with a fast conductive coating, it is found that: coated The measured voltage drop of the newly replaced anode with fast conductive coating is twice that of the...

Embodiment 2

[0035] Embodiment 2 (one-layer structure)

[0036] 1) Add 40% Al 2 o 3 Sol, 18% AlF 3 , 10% LiF, 20% Li2 CO 3 , 2% carbon fiber, 5% B 2 o 3 , 5% C powder, mixed evenly at room temperature to prepare coating slurry.

[0037] 2) Anode surface cleaning: transport the assembled anode to the coating coating site, and use high-pressure air to blow the bottom palm of the anode to remove the dust on the bottom palm to ensure that the coating adheres firmly.

[0038] 3) Coat the prepared coating slurry on the bottom palm of the anode, and the coating thickness is about 5-10mm.

[0039] 4) The cured new anode coated with a fast conductive coating is used for electrolysis, and the equidistant pressure drop of the anode guide rod is measured every 10 minutes, and compared with the new anode not coated with a fast conductive coating, it is found that: coated The measured voltage drop of the newly replaced anode with the fast conductive coating is twice that of the new anode without ...

Embodiment 3

[0040] Embodiment 3 (three-layer structure)

[0041] 1) Preparation of the first layer (bonding layer) coating: 30% Al 2 o 3 Sol, 30% SiO 2 Sol, 10% AlF 3 , 5% carbon fiber, 5% silicon carbide, 10% B 2 o 3 , 10% B 4 C particles, mixed uniformly at room temperature to prepare coating slurry.

[0042] 2) Preparation of the second layer (functional layer) coating: 20% Al 2 o 3 Sol, 20% SiO 2 Sol, 10% AlF 3 , 5% carbon fiber, 5% silicon carbide, 20% B 2 o 3 , 20% C powder, mixed uniformly at room temperature to prepare coating slurry.

[0043] 3) Preparation of the third layer (protective layer) coating: 20% Al 2 o 3 Sol, 20% AlF 3 , 20% Li 2 CO 3 , 5% carbon fiber, 15% silicon carbide, 10% B 2 o 3 , 10% B 4 C particles, mixed uniformly at room temperature to prepare coating slurry.

[0044] 4) Anode surface cleaning: transport the assembled anode to the coating coating site, and use high-pressure air to blow the bottom palm of the anode to remove the dust on ...

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Abstract

The invention relates to a rapid conductive coating for newly changed anode of an aluminum electrolysis cell and a coating method thereof. The bottom of an aluminum electrolysis newly changed anode is coated by a layer of rapid conductive coating, and the coating comprises the following main formula components: 2-60wt% of an adhesive, 10-60wt% of an additive, 2-20wt% of an enhancer and 2-60wt% of functional particles. According to the rapid conductive coating disclosed by the invention, the initial crystallization temperature of electrolyte in a newly changed anode area can be properly reduced, so that the electrolyte is difficultly condensed on the bottom of the anode. Meanwhile, the coating has the effect of rapidly separating a condensed electrolyte layer at the bottom of the anode from the bottom of the anode, the conductive speed of the newly changed anode is greatly improved, and the aims of saving the energy and improving the efficiency during aluminum electrolysis are achieved.

Description

technical field [0001] The invention belongs to the technical field of aluminum electrolysis, and in particular relates to a fast conductive coating for new anodes of aluminum electrolysis and a coating method thereof. Background technique [0002] In the process of industrial aluminum electrolysis, the carbon anode will be continuously consumed, so that the anode is periodically replaced after a period of electrolysis (generally about 30 days), that is, the residual anode is lifted and removed from the aluminum electrolytic cell, and the new anode is replaced to the electrolyzer. However, after the new anode is replaced into the electrolytic cell, it does not conduct electricity immediately, but the newly replaced anode is gradually heated in the electrolytic cell and begins to conduct electricity slowly, but its conductive speed is very slow, and generally it takes 24 hours to complete the conduction. carry the current it normally needs to share. We hope that as soon as ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/02C04B28/24C04B28/10C04B26/26C04B28/34C09D5/24B05D5/12B05D3/12B05D3/02
Inventor 吕晓军双亚静李劼赖延清
Owner CENT SOUTH UNIV
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