Method for producing one-dipping two-baking anode carbon block

A technology of anode carbon block and production method, which is applied in the field of production of one-dip and two-baked anode carbon block, can solve the problems of heating of electrolyte, increase of electrolyte resistivity, increase of consumption of fluorine salt, etc., so as to prolong the service period and reduce the voltage drop. , the effect of reducing workload

Inactive Publication Date: 2008-08-27
WEN COUNTY DONGFANG CARBON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is a lot of carbon slag in the electrolytic cell, which reduces the service life of the prebaked anode carbon block, and the labor intensity of the workers increases; the resistivity of the electrolyte increases, the electrolyte

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Embodiment 1: a kind of production method of dipping two anode carbon blocks, including the production method of common anode carbon blocks, its concrete steps are:

[0031] a. Crush the delayed petroleum coke into a particle size of less than or equal to 40 mm, and then calcine it at a temperature of 1250° C. for 48 hours after blocking the air to remove volatile components and shrink the material to form a carbonaceous raw material, that is, the calcined petroleum coke A;

[0032] b. Crushing the calcined petroleum coke A, sieving and partially pulverizing to obtain calcined petroleum coke B of various particle sizes for future use;

[0033] c. Melt the coal tar pitch completely under the temperature condition of 180°C to obtain the melted pitch C, and let it stand for later use;

[0034] d. Add the melted pitch C to the calcined petroleum coke B after preheating, and knead it evenly to form a paste D under the temperature condition of 140° C., wherein the amount of t...

Embodiment 2

[0047] Embodiment 2: a kind of production method of dipping two anode carbon blocks, including the production method of common anode carbon blocks, its concrete steps are:

[0048] a. Crush the delayed petroleum coke into a particle size of less than or equal to 40mm, and then calcine it at 1300°C for 40 hours after blocking the air to remove volatile components and shrink the material to form a carbonaceous raw material, that is, the calcined petroleum coke A;

[0049] b. Crushing the calcined petroleum coke A, sieving and partially pulverizing to obtain calcined petroleum coke B of various particle sizes for future use;

[0050] c. Melt the coal tar pitch completely under the temperature condition of 150°C to obtain the melted pitch C, and put it aside for later use;

[0051] d. Add the melted pitch C to the calcined petroleum coke B after preheating, knead and knead evenly to form a paste D under the temperature condition of 160°C, wherein the amount of the melted pitch C i...

Embodiment 3

[0064] Embodiment 3: a kind of production method of anode carbon block soaked twice, comprises the production method of common anode carbon block, and its concrete steps are:

[0065] a. Crush the delayed petroleum coke into a particle size smaller than or equal to 40 mm, and then calcine it at 1300° C. for 45 hours after blocking the air to remove volatile components and shrink the material to form a carbonaceous raw material, that is, the calcined petroleum coke A;

[0066] b. Crushing the calcined petroleum coke A, sieving and partially pulverizing to obtain calcined petroleum coke B of various particle sizes for future use;

[0067] c. Melt the coal tar pitch completely under the temperature condition of 160°C to obtain the melted pitch C, and put it aside for later use;

[0068] d. Add the melted pitch C to the preheated calcined petroleum coke B, and knead it evenly to form a paste D at a temperature of 150° C., wherein the amount of the melted pitch C is 16 parts by wei...

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Abstract

The invention discloses a method for producing one impregnating two calcining anode carbon blocks, which is on the basis of producing common anode carbon blocks and comprises following steps: selectively using calcined coke, adding a little antioxidant additive, preheating a common anode under the temperature of 280-330DEG C for 18-24 hours, then, hoisting in a high pressure impregnation tank, filling impregnating pitch whose temperature is 160-180DEG C under the vacuum pressure of 0.09-0.094MPa, pressurizing 1.55-1.6MPa, maintaining the pressure for 3-5 hours, hoisting out and cooling to normal temperature, then, calcining for 200-220 hours under the temperature condition that the maximum temperature is 800-900DEG C according to a heating curve, cooling, and then cleaning up to obtain a new one impregnating two calcining anode carbon block. Since the pitch is filled in an air vent of the anode, the mechanicalness and the physical and chemical properties of the anode carbon blocks are newly changed, the bulk density and the compressive strength are increased, the porosity is lowered, the resistivity is lowered, the activity of the binder coke and the activity of aggregate tend to be consistent, the speed of selective oxidation is lowered, the voltage drop of the anode carbon blocks is lowered, and the using period of the anode is prolonged.

Description

Technical field: [0001] The invention relates to a production method of an anode carbon block, in particular to a production method of an anode carbon block soaked twice and its behavior in an aluminum electrolytic cell. Background technique: [0002] At present, the resistivity of prebaked anode carbon blocks for aluminum electrolysis is generally between 55 and 65 μΩ.m, and the service life is about 28 days. During the use process, prebaked anode carbon blocks have serious oxidation, slag drop, and cracks. There is a lot of carbon slag in the electrolytic cell, which reduces the service life of the prebaked anode carbon block, and increases the labor intensity of the workers; the resistivity of the electrolyte increases, the electrolyte heats up, the fluoride salt volatilizes and the electrolyte taken away by the carbon slag, resulting in the consumption of fluoride salt Substantial increase, workshop operating conditions deteriorated, serious environmental pollution. In...

Claims

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Application Information

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IPC IPC(8): C25C3/12C04B35/532C04B35/64
Inventor 张宝珠张兆囤王进良崔玉章周铁柱祖书鹏李志刚孙占胜孙新治
Owner WEN COUNTY DONGFANG CARBON
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