Preparation technology for inert anode material or inert cathode coating material for aluminum electrolysis

An inert anode and cathode coating technology, applied in electrodes, electrolysis process, electrolysis components, etc., can solve the problems of difficult to achieve wide application of titanium boride, high price of titanium boride, high comprehensive preparation cost, and low comprehensive production cost. , The effect of short preparation cycle and controllable aluminum content

Active Publication Date: 2012-09-12
SHENZHEN SUNXING LIGHT ALLOYS MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Titanium boride has good wettability to molten aluminum and is resistant to cryolite corrosion. However, the existing industrial production methods of titanium boride have harsh reaction conditions and low reaction yield (less than 90%). Comprehensive preparation Disadvantages of high cost
Due to the high price of titanium boride, it is difficult to realize the wide application of titanium boride in the preparation process of inert anode materials and inert cathode materials

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, put it into argon protection after vacuuming, raise the temperature to 750°C, add the mixture of dry potassium fluoroborate and potassium fluorotitanate to the reactor according to the reaction ratio, stir rapidly, and react After 5 hours, titanium boride and cryolite were generated, and titanium boride was obtained after separation by 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 titanium 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 titanium 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 place it in the reactor. After evacuating, put it under argon protection, raise the temperature to 750°C, add a mixture of dry sodium fluoroborate and sodium fluorotitanate to the reactor according to the reaction ratio, stir rapidly, and react After 5 hours, titanium boride and cryolite were generated, and titanium boride was obtained after separation by 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 titanium 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 titanium 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 preparation process for an inert anode material or an inert cathode coating material for aluminum electrolysis. The preparation process comprises the following steps of: (A) feeding aluminum into a reactor, vacuumizing and introducing an inert gas, adding a mixture of dried fluoborate and fluotitanate in the reactor and reacting to generate titanium boride and cryolite and separating to obtain the titanium boride; and (B) fusing the titanium boride with a titanium boride, tamping the mixture to the surface of a carbon cathode and sintering to form the inert cathode coating material for aluminum electrolysis; or uniformly mixing the obtained titanium boride with a carbon material, forming at high pressure and sintering at high temperature to form the inert anode material for aluminum electrolysis. The preparation process disclosed by the invention has the advantages of simplicity, no need of harsh reaction conditions and high yield of reaction product; the preparation process is used for preparing the inert anode material or inert cathode coating material for aluminum electrolysis; and the inert anode material or inert cathode coating material has favorable corrosion resistant performance, excellent conducting performance and thermal shock resisting performance; and the firmness of the inert anode material or inert cathode coating material meets the industrial service requirement.

Description

technical field [0001] The invention relates to a preparation process of 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 cathode...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C3/12
CPCC01B35/04C25C3/08C25C3/125C25C7/02
Inventor 陈学敏杨军李志红伍卫平
Owner SHENZHEN SUNXING LIGHT ALLOYS MATERIALS CO LTD
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