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Preparation method of phosphorus pig iron cathode for aluminum electrolysis

A technology for phosphorus pig iron and aluminum electrolysis, applied in the field of aluminum electrolysis, can solve the problems of poor connection between the cathode carbon block and square steel, and achieve the effects of reducing the cathode pressure drop, prolonging the service life and reducing the power consumption.

Active Publication Date: 2013-07-24
YUNNAN YONGXIN ALUMINUM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a method that can effectively solve the problem of poor connection between the cathode carbon block and the square steel, and at the same time effectively The preparation method of the phosphorus pig iron cathode for aluminum electrolysis reduces the cathode voltage drop in the aluminum electrolysis process greatly, thereby reduces the production cost in the aluminum electrolysis process

Method used

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  • Preparation method of phosphorus pig iron cathode for aluminum electrolysis

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Effect test

Embodiment 1

[0012] The pre-assembly of the cathode square steel and the cathode carbon block is sealed, that is, the oxygen in the box is discharged to avoid the oxidation of the cathode square steel and the cathode carbon block, and then it is heated in a soaking furnace at a heating temperature of 450 ° C and kept for 5 Hours, after being transported out of the soaking furnace, cast with the pre-prepared phosphorus pig iron water, and then seal it, discharge the oxygen in the box, and then put it into normal temperature for natural cooling, and the obtained phosphorus pig iron cathode can be used in the production of aluminum electrolysis . The weight percentages of impurities contained in the phosphorus pig iron are: Mn: 0.2%, P: 0.4%, Si: 1.5%, C: 2.5%, S<0.3%.

[0013] The prepared phosphorus pig iron cathode was applied in an aluminum electrolytic cell, and the pressure drop difference between the phosphorus pig iron cathode and the traditional hot stamped cathode was compared. Res...

Embodiment 2

[0015] The pre-assembly of the cathode square steel and the cathode carbon block is sealed, that is, the oxygen in the box is discharged to avoid the oxidation of the cathode square steel and the cathode carbon block, and then it is heated in a soaking furnace at a heating temperature of 650 ° C and kept for 10 Hours, after being transported out of the soaking furnace, cast with the pre-prepared phosphorus pig iron water, and then seal it, discharge the oxygen in the box, and then put it into normal temperature for natural cooling, and the obtained phosphorus pig iron cathode can be used in the production of aluminum electrolysis . The weight percent of the impurity contained in the phosphorus pig iron is: Mn: 1.2%, P: 1.8%, Si: 4.5%, C: 3.7%, S<0.3%.

[0016] The prepared phosphorus pig iron cathode was applied to an aluminum electrolytic cell, and the difference in pressure drop between the phosphorus pig iron cathode and the hot stamped cathode was compared. Results: When ...

Embodiment 3

[0018] The pre-assembly of the cathode square steel and the cathode carbon block is sealed, that is, the oxygen in the box is discharged to avoid the oxidation of the cathode square steel and the cathode carbon block, and then it is heated in a soaking furnace at a heating temperature of 800 ° C and kept for 20 Hours, after being transported out of the soaking furnace, cast with the pre-prepared phosphorus pig iron water, and then seal it, discharge the oxygen in the box, and then put it into normal temperature for natural cooling, and the obtained phosphorus pig iron cathode can be used in the production of aluminum electrolysis . The weight percentage composition of the impurity content contained in the phosphorus pig iron is: Mn: 0.8%, P: 1.2%, Si: 3.5%, C: 3.1%, S<0.3%.

[0019] The prepared phosphorus pig iron cathode was applied in an aluminum electrolytic cell, and the difference in pressure drop between the phosphorus pig iron cathode and the hot stamped cathode was co...

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Abstract

The invention relates to a preparation method of a phosphorus pig iron cathode for aluminum electrolysis, comprising the following steps of: sealing a pre-assembly of cathode square steel and a cathode carbon block, exhausting oxygen in a tank body to avoid oxidation of the cathode square steel and the cathode carbon block, placing the pre-assembly in a pit furnace, heating to 400-1000 DEG C, preserving the heat for 4-24h, carrying the pre-assembly from the pit furnace and casting with the prepared phosphorus molten pig iron, then sealing, exhausting oxygen in the tank body and then cooling naturally at the normal temperature. The invention has the advantages of simple process and low producing and processing cost. The produced phosphorus pig iron cathode can effectively reduce the cathode fall for the aluminum electrolysis, thereby greatly reducing the power consumption in the process of the aluminum electrolysis, greatly lowering the energy consumption after the product is applied, simultaneously prolonging the service life of the cathode and achieving remarkable economic benefit.

Description

technical field [0001] The invention relates to the technical field of aluminum electrolysis, and relates to a method for preparing a phosphorus pig iron cathode in the process of aluminum electrolysis. Background technique [0002] The cathode for aluminum electrolysis is composed of carbon block and square steel. The combination method is as follows: first heat the cathode carbon block and cathode square steel to above 200°C, then spread the heated hot and cold paste evenly on the bottom of the dovetail groove of the cathode carbon block, and put it into the cathode square steel after solidifying it with tools , and finally use hot paste on both sides of the square steel to make it firm. This combination method has the following disadvantages: First, the hot paste stuck on the bottom of the dovetail groove and the surface of the cathode square steel are all in contact with the surface of the square steel due to the self-weight pressure of the square steel. Affected by fac...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25C3/08
Inventor 丁吉林杨叶伟熊自勇赵瑞敏陈才荣颜非亚王建平王跃全陈渝信伟松赵仕堂普光平龙国辉
Owner YUNNAN YONGXIN ALUMINUM
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