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A method of spraying graphite paste on the surface of anode steel claws

An anode steel claw and surface spraying technology, applied in coating, casting molding equipment, casting molds, etc., can solve the problems of reducing the strength of phosphorus pig iron, increasing the resistance of phosphorus pig iron, weak adhesion, etc., and improving the strength of phosphorus pig iron. , saving raw materials, the effect of uniform coverage

Inactive Publication Date: 2016-05-25
XINJIANG NONGLIUSHI ALUMINUM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The adhesion of graphite on the steel claw head of this process is not strong, so when the steel claw is washed by the phosphorus pig iron water during assembly and casting, a part of the graphite will be detached from the anode steel claw head and float on the surface of the phosphorus pig iron water , even solidification in the middle of phosphorus pig iron water increases the resistance of phosphorus pig iron and reduces the strength of phosphorus pig iron
Even if the formulator takes this problem into consideration and increases the proportion of graphite in graphite paste to 25% to 40% to meet production needs, about 20% of the graphite is also wasted.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A method for spraying graphite paste on the surface of an anode steel claw, comprising steps:

[0026] A, kerosene and graphite are uniformly mixed into a graphite paste, and the graphite accounts for 5-35% of the total weight of the graphite paste;

[0027] Uniform mixing can be done by mechanical stirring, flowing gas, etc., because the proportion of solvent in the graphite paste is relatively large, after thorough mixing, the graphite particles can be refined and dispersed as much as possible, and the uniformity of spraying can be enhanced.

[0028] Graphite in the prior art accounts for 25-40% of the mass of the graphite paste, because the graphite paste is brushed or dipped onto the surface of the steel claw, and the fit is not tight and easy to fall off, wasting a lot of raw materials; in fact, the graphite paste remains on the surface of the steel claw The graphite that plays the role of actual protection and lubrication is only 5-35%.

[0029] However, the embo...

Embodiment 2

[0038] A, kerosene and graphite are uniformly mixed into graphite paste; the mass ratio of graphite to kerosene is 1:9, that is, graphite accounts for 10% of the mass of graphite paste.

[0039] B. Using 0.3 MPa compressed air as the carrier, spray the mixture of kerosene and graphite to the surface of the anode steel claw twice through the spray gun, with an interval of 20s between the two times. The spraying speed is 50L / min, and the spraying thickness is 0.3mm.

[0040] After standing still for 5 minutes, place the steel claw in the anode carbon bowl, and then pour phosphorus pig iron water in the gap. During the casting process, no graphite shedding was found. After casting a phosphorus pig iron solution, the steel claws are fixed; the anode does not loosen the phosphorus pig iron ring during the service life of the aluminum electrolytic cell, and the iron-carbon pressure drop is reduced by 10mv.

[0041] During the standing process, the graphite layer can be dried to co...

Embodiment 3

[0043] A, kerosene and graphite are evenly mixed to be graphite paste; the mass ratio of graphite and kerosene is 1:19, that is, graphite accounts for 5% of the mass of the graphite paste.

[0044] B. Using 0.4 MPa compressed air as the carrier, spray the mixture of kerosene and graphite to the surface of the anode steel claw 4 times through the spray gun, with an interval of 20s between each time. The spraying speed is 450L / min, and the spraying thickness is 0.8mm.

[0045] After standing for 10 minutes, place the steel claw in the anode carbon bowl, and then pour phosphorus pig iron water into the gap. During the casting process, no graphite shedding was found. After casting a phosphorus pig iron solution, the steel claws are fixed; the anode has no loosening of the phosphorus pig iron ring during the service life of the aluminum electrolytic cell, and the iron-carbon pressure drop is reduced by 9mv.

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Abstract

The invention discloses a method for spraying a graphite paste on the surface of an anode steel claw. The method comprises the following steps: uniformly mixing kerosene with graphite to form the graphite paste, and spraying the surface of the anode steel claw with the mixture comprising kerosene and graphite through a spray tool by adopting compressed air having a pressure of 0.3-0.6MPa as a carrier, wherein the content of graphite is 5-35% of the total weight of the graphite paste. The graphite paste spraying method provided in the embodiment of the invention has the advantages of uniform and tight attachment and difficult shedding of the sprayed graphite paste, substantial reduction of the content of graphite in the graphite paste, and cost saving.

Description

technical field [0001] The invention relates to the technical field of prebaked anode assembly for an aluminum electrolytic cell, in particular to a method for spraying graphite paste on the surface of an anode steel claw. Background technique [0002] When assembling carbon prebaked anodes in the aluminum electrolysis industry, in order to prevent the phosphorus pig iron from hitting the steel claws and iron rings and sticking to the steel claws during casting, generally the anode steel claws are coated with graphite powder first, and then the phosphorus pig iron is cast. The specific process is: A. Graphite powder is put into kerosene or diesel oil to make a paste, and the proportion of graphite in the graphite paste is generally 25% to 40%; B. Brush on the steel claw head with a brush, or directly brush the steel claw head Dip it in the graphite paste; C. Dry the graphite layer with natural gas or electric heating. There are following problems in this technique and propo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C3/00B22C23/02C25C3/12
Inventor 熊自强
Owner XINJIANG NONGLIUSHI ALUMINUM
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