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A kind of flexible graphite impregnant formulation and its preparation and application process

A technology of flexible graphite and impregnating agent, applied in the field of impregnating agent of carbon or graphite materials, can solve the problems of unsatisfactory effect of anode carbon block transformation, increasing the number of carbon anode roasting, high cost, etc., so as to reduce ineffective waste. The effect of reducing slag rate, increasing anode compactness and reducing slag removal rate

Active Publication Date: 2022-08-02
湖南国发控股有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the existing electrolytic aluminum carbon anode impregnation process, the modified pitch is generally used as the impregnating agent, and it will be roasted again after impregnation. Since the volatile matter will escape after roasting, new pores will be formed, so the pitch impregnating agent is very important for the anode. The transformation effect of carbon block is not ideal, and it increases the number of carbon anode roasting, making the cost of time, raw materials, equipment, etc. high, making it difficult to industrialize
[0003] Flexible graphite, as a functional carbon material, is generally used as a sealing, flame retardant, and adsorption material. The conductivity of flexible graphite can also be used in the production of batteries. However, flexible graphite is currently used as an impregnating agent to treat prebaked anodes. There are very few studies on the technical materials of this application, so this application aims to provide a high-efficiency flexible graphite-type impregnating agent, which has high impregnation efficiency and good impregnation effect, and can effectively prolong the service life of the anode carbon block

Method used

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  • A kind of flexible graphite impregnant formulation and its preparation and application process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The high-efficiency flexible graphite impregnating agent in this embodiment is a glue solution prepared by mixing 15% flexible graphite, a total amount of 5% treatment agent and 85% water;

[0031] Flexible graphite is a mixture of various expandable graphites, and the flexible graphite meets the following requirements at the same time:

[0032] 1. The expandable graphite whose expansion temperature is between 60℃-100℃ accounts for 5%, the expandable graphite whose expansion temperature is between 100℃-300℃ accounts for 5%, and the expandable graphite whose expansion temperature is above 300℃ accounts for 5%. %.

[0033] In this embodiment, the treating agent is composed of an oxidizing agent, a coupling agent, a dispersing agent, and a thickening agent. Aminopropyltriethoxysilane, dispersant is 1% sodium lignosulfonate, thickener is 1% potassium chloride.

[0034] The concrete steps of the preparation and application method of impregnating agent in the present embodi...

Embodiment 2

[0047] In this example, the impregnating agent is also a glue solution prepared by mixing 15% flexible graphite, a total amount of 5% treating agent and 85% water; the difference from Example 1 is that the flexible graphite in this example The composition also meets the following requirements:

[0048] 1. Expandable graphite with expansion temperature between 60℃-100℃ accounts for 0%, expandable graphite with expansion temperature between 100℃-300℃ accounts for 7.5%, and expandable graphite with expansion temperature above 300℃ accounts for 7.5% %.

[0049] 2. In this embodiment, the mass fraction ratios in the total impregnating agent are respectively 2% of ammonium persulfate oxidant, 1% of γ-aminopropyl triethoxysilane coupling agent, and 1% of sodium lignosulfonate dispersant. %, potassium chloride thickener 1%.

[0050] The specific steps of its processing method are the same as those in Example 1.

[0051] The obtained air permeability test result is 0.58nPm; the air ...

Embodiment 3

[0053] In this embodiment, the impregnating agent is a glue solution prepared by mixing 20% ​​flexible graphite, 7.5% treating agent and 77.5% water in total;

[0054] In this embodiment, the flexible graphite satisfies the following conditions:

[0055] 1. Expandable graphite with expansion temperature between 60℃-100℃ accounts for 10%, expandable graphite with expansion temperature between 100℃-300℃ accounts for 5%, and expandable graphite with expansion temperature above 300℃ accounts for 5%. %.

[0056] 2. In this example, the mass fraction of the total impregnating agent is 3% of ammonium persulfate oxidant, 1.5% of γ-aminopropyl triethoxysilane coupling agent, and 1.5% of sodium lignosulfonate dispersant. %, potassium chloride thickener 1.5%.

[0057] The specific steps of its processing method are the same as those in Example 1.

[0058] The obtained air permeability test result is 0.50nPm; the air reactivity test result is that the anode carbon block loss rate is 6....

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Abstract

The invention discloses a formula of a flexible graphite impregnating agent and a preparation and application process thereof. The impregnating agent is a glue liquid formed by adding expandable graphite with different particle sizes and different concentrations into water in which a treatment agent is dissolved. The impregnating agent is immersed into the anode pores by means of negative pressure first, then positive pressure and ultrasonic waves, and flexible graphite of different particle sizes can effectively fill the pores of the corresponding particle size. After several times of gradient heating, the expansion effect of each heating has different effects. Different pores and pore channels are filled and blocked with different effects, which not only increases the density and weight of the anode carbon block, but also because the main component of the impregnant is treatment The latter flexible graphite can be closely combined with the inside of the carbon block to prevent slag drop, improve the current density, and fill the pores to block the oxidation reaction channel, which reduces the ineffective oxidation and prolongs the service life.

Description

technical field [0001] The invention relates to the technical field of impregnating agents for carbon or graphite materials which are mixed and pressed with one or more raw materials in graphite, carbon powder, petroleum coke and pitch coke and then sintered and formed, in particular to an impregnating agent for electrolytic aluminum. The invention relates to an impregnating agent for anode carbon blocks, in particular to a formula of a flexible graphite impregnating agent and a preparation and application process thereof. Background technique [0002] Electrolytic aluminum carbon anodes generally use various cokes as the main raw materials. The coke itself has a honeycomb or fiber macrostructure, and there are pore gaps with different pore sizes on the surface and inside. Pyrolysis and volatilization escape also lead to the formation of irregular vent holes inside the anode. In short, after the prebaked anode carbon block is produced, there will be a large number of pores ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B41/85
CPCC04B41/5001C04B41/85C04B41/009C04B35/52C04B41/4535C04B41/50C04B41/49C04B41/4905C04B41/0072
Inventor 黄强卢丰玉黄治齐
Owner 湖南国发控股有限公司
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