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High performance room temperature cured titanium boride cathode coating for aluminium reduction cell

A technology of curing aluminum electrolytic cells at room temperature, applied in the field of cathode coatings for aluminum electrolytic cells, to achieve the effects of small deformation, accelerated heating rate, and high carbon formation rate

Inactive Publication Date: 2012-04-18
SOUTHWEAT UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a new high-performance aluminum electrolytic cell with room temperature curing titanium boride cathode coating for the defects of the above-mentioned titanium boride cathode coating for aluminum electrolytic cells

Method used

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  • High performance room temperature cured titanium boride cathode coating for aluminium reduction cell
  • High performance room temperature cured titanium boride cathode coating for aluminium reduction cell
  • High performance room temperature cured titanium boride cathode coating for aluminium reduction cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The formula of the titanium boride cathode coating paste of this embodiment is shown in Table 1.

[0039] Table 1

[0040]

[0041] Stir and mix the materials in Table 1 to form a paste, then apply it on the carbon cathode of the aluminum electrolytic cell, and cure it at room temperature for 24 hours. At the same time, the coating paste sample was taken for comprehensive thermal analysis, and the results were as follows: figure 1 shown. according to figure 1 According to the comprehensive thermal analysis results, according to the method for determining the carbonization temperature rise system in the summary of the invention, the specific carbonization variable speed temperature rise system of the coating paste is determined, as shown in Table 2. In practical applications, high-temperature carbonization can be carried out by using the heat generated by the aluminum electrolytic roasting process according to the carbonization variable speed heating system given i...

Embodiment 2

[0046] The formula of the titanium boride cathode coating paste of this embodiment is shown in Table 3.

[0047] table 3

[0048]

[0049] The construction method of this embodiment and the determination of the carbonization variable speed heating system of the cathode coating are the same as that of Embodiment 1, omitted. TiB obtained after high temperature carbonization 2 Cathode coating, no cracks, no falling off, the bonding strength is greater than the tensile strength of the semi-graphite cathode carbon block for aluminum electrolysis (>3.0MPa); the resistivity at 25°C: 26.6μΩ·m; wet with aluminum liquid It has good performance and has the basic conditions for application in aluminum electrolysis production.

[0050] In addition, the cross-sectional morphology of the titanium boride cathode coating prepared in this example is shown in image 3 . It can be seen from the figure that TiB 2 Uniformly dispersed in the coating, while the carbon fiber is embedded betwee...

Embodiment 3

[0052] The formula of the titanium boride cathode coating paste of this embodiment is shown in Table 4.

[0053] Table 4

[0054]

[0055] The construction method of this embodiment and the determination of the carbonization variable speed heating system of the cathode coating are the same as that of Embodiment 1, omitted. TiB obtained after high temperature carbonization 2 Cathode coating, no cracks, no falling off, bonding strength greater than the tensile strength of semi-graphite cathode carbon block for aluminum electrolysis (>3.0MPa); open porosity <13%; resistivity at 25°C: 31.4μΩ· m; It has good wettability with molten aluminum and has the basic conditions for application in aluminum electrolysis production.

[0056] In addition, the cross-sectional morphology of the titanium boride cathode coating prepared in this example is shown in Figure 4 . It can be seen from the figure that TiB 2 Uniformly dispersed in the coating, while the carbon fiber is embedded bet...

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Abstract

The invention discloses a high performance room temperature cured titanium boride cathode coating for an aluminium reduction cell. The coating is characterized by taking titanium boride powder as a base material, adding phenolic resins, acrylic resins and a curing agent on the basis of the conventional auxiliary material composition, firstly mixing the materials to prepare paste, then applying the paste on the carbon cathode of the aluminium reduction cell, carrying out curing for at least 24 hours at room temperature and then carrying out carbonization according to the optimum carbonization temperature rising system worked out based on variation of mass and energy of the coating paste in the process of high temperature carbonization variation, wherein the phenolic resins and the acrylic resins have the advantages of excellent heat resistance, higher carbon yield and the like. The invention can realize room temperature curing of the TiB2 cathode coating, improve the impact damage resistance capability and toughness of the coating and reduce the resistivity, obtain the TiB2 cathode coating with less deformation and optimum performance and more advantageously promote the popularization and application of the TiB2 cathode coating.

Description

technical field [0001] The invention belongs to the technical field of cathode coatings for aluminum electrolytic cells, and in particular relates to a high-performance aluminum electrolytic cell for curing titanium boride cathode coatings at room temperature. Background technique [0002] Titanium boride (TiB 2 ) high melting point, high conductivity, good compactness, high hardness, resistance to wetting by molten aluminum and cryolite melt, and good properties such as being completely wetted by molten aluminum. It has become a wettable inert material for aluminum electrolysis. Material of choice for cathodic coatings. But in order to make TiB 2 It can be bonded to the surface of carbon cathode for aluminum electrolysis, often in the form of TiB 2 The paste of the cathodic coating as the base material is added with a thermosetting resin, a curing agent, a solvent, etc., so that TiB 2 Under the action of the curing agent, the powdered resin will cross-link and polymeriz...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25C3/08
Inventor 戴亚堂胡小平张欢李常雄周龙平刘志虎
Owner SOUTHWEAT UNIV OF SCI & TECH
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