A method for providing a protective coating for carbonaceous components of an electrolysis cell

A technology of electrolytic cells and carbon components, applied in the direction of electrolytic components, electrolytic processes, electrodes, etc., to achieve the effect of reducing net carbon consumption

Inactive Publication Date: 2003-03-05
ALCAN INT LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This suggests that there is no technically more advanced or cost-effective way to resist degradation of carbon-containing electrolyzer components

Method used

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  • A method for providing a protective coating for carbonaceous components of an electrolysis cell
  • A method for providing a protective coating for carbonaceous components of an electrolysis cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] By mixing 30 wt% H 3 BO 3 , 30 wt% AlF 3 and 40% by weight ammonium lignosulfonate to prepare a suspension. Lignosulfonate was obtained as a 50% liquid formulation from Borregaard Lignotech, Bridgewater, NJ (NORLIG TSFL TM ). In the liquid state, the lignosulfonate has a pH range of 4-5 and contains 47.5-51.5% solids. h 3 BO 3 and AlF 3 is in powder form.

[0038] Spray the suspension on the upper part of the pre-baked anode to about 1 / 2 to 1 / 3 height of the anode using a spray gun with a pressure of 120 psi.

Embodiment 2

[0040] A series of oxidation experiments were performed using small laboratory-grade samples of anode material coated with various coating formulations having lignosulfonate as the primary binder. NORLIG TSFL TM Used again as described in Example 1. Use a spray gun with 120psi pressure to apply the paint to a thickness of about 2mm, then let it air dry at room temperature for about 3 hours.

[0041] In the oxidation experiments, the coated samples were exposed to high temperatures in a 13" x 7" x 10" furnace. The furnace was heated from room temperature to 600°C in 4 hours and held at 600°C for 12 hours.

[0042] Each sample was weighed before and after exposure, and the percent weight loss was calculated. The composition of the coatings and the results obtained are listed in Table 1 below:

[0043] Sample serial number

composition

oxidation

(% weight loss)

Adhesive

Solid content

LSA **

(%)

Phenolic resin

fat

B ...

Embodiment 3

[0047] The procedure of Example 2 was repeated using other various coating compositions. The composition of the coatings used and the oxidation results obtained are listed in Table 2 below:

[0048] Sample serial number

composition

oxidation

(% weight loss)

Adhesive

Solid content

LSA **

(%)

Phenolic resin

fat

B 2 o 3

(%)

h 3 BO 3

(%)

Additives

(%)

Comparative Experiment

0

0

0

0

60-90

E-60

40

1

57

2 SiC

7

E-61

40

1

57

2 SiC

1

E-62 *

40

1

57

2 SiO 2

1

E-63 *

40

1

57

2 SiO 2

2

E-78

40

-

30

30 AlF 3

0

E-79

40

-

30

30 AlF 3

0

E-80

40

2

...

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Abstract

A method of treating a carbonaceous cell component of an electrolyte cell for the production of aluminum, to impart protection against deterioration during operation of the cell. A liquid suspension of a refractory material dispersed in a lignosulfonate binder solution is prepared and applied as a protective coating to the surface of carbonaceous cell components and allowed to dry.

Description

technical field [0001] The present invention relates to a process for the preparation of protective coatings for carbon-containing components of electrolytic cells used in aluminum production. The present invention relates more particularly to coating compositions capable of protecting carbonaceous components of electrolytic cells from degradation during electrolysis, and components containing them. Background technique [0002] Aluminum production is usually carried out by the Hall-Heroult electrolytic reduction method, in which alumina is dissolved in molten cryolite and electrolyzed at a temperature of about 900-1000°C. The method is carried out in a reduction tank, which generally comprises a stainless steel shell provided with an insulating lining made of a suitable refractory material which in turn further comprises a carbon lining in contact with the molten components. One or more anodes, usually made of prebaked carbon blocks, are connected to the positive pole of a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C3/08B05D1/00B05D7/24C04B41/50C04B41/85C04B41/87C23C18/00C23C18/12C25C3/12C25C7/02
CPCC04B41/87C04B41/5006C04B41/507C25C3/125C04B2111/00879C25C3/08C04B41/009C04B41/85C04B41/4539C04B41/5011C04B41/5059C04B41/5035C04B35/52
Inventor A·A·米尔特奇J·伯格伦
Owner ALCAN INT LTD
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