Process for preparing aluminum electrolysis inert anode material or aluminum electrolysis inert cathode coating material

A preparation process, inert anode technology, applied in the direction of boron/boride, metal boride, etc., can solve the problems of difficult to achieve wide application of zirconium boride, high comprehensive preparation cost, low reaction yield, etc., and achieve comprehensive production cost. Low, short preparation cycle, controllable aluminum content

Inactive Publication Date: 2012-10-24
SHENZHEN SUNXING LIGHT ALLOYS MATERIALS CO LTD
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Zirconium boride has good wettability to aluminum liquid and is resistant to cryolite corrosion, but the existing industrial production methods of zirconium boride have harsh reaction conditions, and the reaction yield is not high (less than 90%). Comprehensive preparation Disadvantages of high cost
Due to the high price of zirconium boride, it is difficult to realize the wide application of zirconium boride in the preparation process of inert anode material or inert cathode material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Weigh 2 tons of aluminum and put it in the reactor. After evacuating, put it under argon protection, raise the temperature to 750°C, add the dry mixture of potassium fluoroborate and potassium fluorozirconate into the reactor according to the reaction ratio, stir rapidly, and react After 5 hours, zirconium boride and cryolite were generated, and zirconium boride was obtained after separation by existing conventional separation methods. After drying, the weight was 1.52 tons, and the yield of the reaction product reached more than 97%.

[0023] The obtained zirconium boride and resin are mixed at a weight ratio of 90: (1-10), and then sintered under high pressure to make an inert anode material; the obtained zirconium boride and resin are mixed at a weight ratio of 90: (1-10) After mixing by weight, it is melted and tamped on the surface of the carbon cathode, and then sintered to form an inert cathode coating material.

Embodiment 2

[0025] Weigh 2 tons of aluminum and put it in the reactor. After evacuating, put it under argon protection, raise the temperature to 750°C, add the dry mixture of sodium fluoroborate and sodium fluorozirconate into the reactor according to the reaction ratio, stir rapidly, and react After 5 hours, zirconium boride and cryolite were generated, and zirconium boride was obtained after separation by existing conventional separation methods. After drying, the weight was 1.53 tons, and the yield of the reaction product reached more than 97%.

[0026] After mixing the obtained zirconium boride and resin at a weight ratio of 99:1, it can be made into an inert anode material through high-pressure sintering; after mixing the obtained zirconium boride and resin at a weight ratio of 99:1, after melting Tamped to the surface of the carbon cathode and sintered to form an inert cathode coating material.

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PUM

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Abstract

The invention provides a process for preparing an aluminum electrolysis inert anode material or an aluminum electrolysis inert cathode coating material. The process comprises the following steps of: (A), placing aluminum into a reactor, vacuumizing the reactor, introducing an inert gas, raising temperature to 700 to 800 DEG C, adding a dry fluoroborate and fluorozirconate mixture into the reactor, quickly stirring the mixture, performing reaction for 4 to 6 hours, extracting molten liquid in an upper layer, and obtaining zirconium boride in a lower layer; and (B), melting the obtained zirconium boride and a carbon material, tamping a molten product onto the surface of a carbon cathode, and sintering the carbon cathode to obtain the aluminum electrolysis inert cathode coating material; or uniformly mixing the obtained zirconium boride and the carbon material, forming the mixture under the pressure of 1,000MPa, and sintering the formed mixture at 2,000 DEG C to form the aluminum electrolysis inert anode material. The process is simple, free of severe reaction conditions and high in reaction product yield, and the preparation requirements of the aluminum electrolysis inert anode material or the aluminum electrolysis inert cathode coating material can be met.

Description

technical field [0001] The invention relates to a preparation process for an inert anode material or an inert cathode coating material for aluminum electrolysis. Background technique [0002] At present, the aluminum electrolysis industry still adopts the traditional Hall-Heroult method. The electrolyte has always been based on cryolite-alumina. The current prebaked anode electrolytic cells mainly use carbon anodes and carbon cathodes. The precipitated oxygen is continuously consumed, transformed into carbon monoxide and carbon dioxide, and discharged into the atmosphere. The carbon cathode is not wet to the aluminum liquid, and will be corroded by cryolite for a long time. In order to prolong the service life of the electrolyzer, reduce the carbon emissions to the atmosphere, reduce the electrolysis temperature, and improve the electrolysis efficiency, it is often necessary to prepare cheap and large-scale industrially produced inert anode materials or prepare carbon cathod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B35/04C25C3/12C25C3/08
Inventor 陈学敏杨军李志红伍卫平韦世铭
Owner SHENZHEN SUNXING LIGHT ALLOYS MATERIALS CO LTD
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