Method for prolonging service life of magnesium electrolytic bath

A magnesium electrolytic cell and electrolytic cell technology, applied in the field of electrolytic magnesium production, can solve problems affecting the life of the electrolytic cell, etc., and achieve the effects of large promotion and application prospects, reduced production costs, and reduced overall costs

Active Publication Date: 2018-01-09
CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problem that the existing magnesium electrolysis affects the service life of the electrolyzer, the present invention provides a method for prolonging the service life of the magnesium electrolyzer

Method used

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  • Method for prolonging service life of magnesium electrolytic bath

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Effect test

Embodiment 1

[0023] Use sponge titanium production process to steam MgCl 2 As a raw material, the MgO content is 0.5-1.25%, and the MgO content in the electrolyte is 0.05-0.08% after purification in the electrolyte purification device for 0.5h under the condition of 750°C and an electrolysis voltage of 3.0V. Then add the above-mentioned purified electrolyte that meets the requirements into the magnesium electrolysis cell of the lower-insertion graphite anode and the side-insertion carbon steel cathode, and monitor the electrode current to control the electrode current distribution within 10%. After 3 years of operation, electrolysis The tank voltage is increased by 0.01V, and the graphite electrode is reduced by 1.1%, and stable operation can still be continued.

Embodiment 2

[0025] Using carnallite as raw material, the content of MgO is 1.5 to 5%. Under the condition of 750°C and an electrolysis voltage of 3.1V, the MgO content in the electrolyte is 0.07-0.09% after purification in the electrolyte purification device for 1 hour. Then, the purified electrolyte that meets the requirements is added to the side-insertion graphite anode and the lower-insertion carbon steel cathode magnesium electrolysis cell, and the electrode current is monitored to control the electrode current distribution within 8%. After 3 years of operation, electrolysis The tank voltage is increased by 0.05V, and the graphite electrode is reduced by 2.3%, and stable operation can still be continued.

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Abstract

The invention belongs to the field of electrolytic process magnesium preparation and particularly relates to a method for prolonging the service life of a magnesium electrolytic bath. The method for prolonging the service life of the magnesium electrolytic bath needs to meet one of the following conditions: (1) a graphite anode is arranged in a laterally inserted mode or in a downwards inserted mode, and a cathode is arranged correspondingly in a downwards inserted mode or in a laterally inserted mode; (2) the MgO content of electrolyte needs to be controlled below 0.1% through an electrolytepurification device; and (3) electrode current is distributed uniformly through electrode current monitoring and processing. By means of the method, the service life of the magnesium electrolytic bathcan be prolonged, and the comprehensive manufacturing cost of magnesium electrolysis can be reduced; the method has the important practical significance in development of the magnesium electrolytic bath.

Description

Technical field [0001] The invention belongs to the field of magnesium production by electrolysis, and specifically relates to a method for prolonging the service life of a magnesium electrolytic cell. Background technique [0002] Magnesium electrolysis is an important method for preparing metallic magnesium, and it is also a key process for magnesium-titanium joint enterprises to realize the magnesium-chlorine cycle. Its energy consumption index accounts for about 36.5% of the manufacturing cost of sponge titanium. At present, there are mainly two types of electrolytic cells without separators and multi-stage electrolytic cells according to the structure of the electrolytic cell. The electrolysis process is internally higher than MgCl at 655~720℃ 2 The process of decomposing it into liquid metal magnesium and chlorine gas above the decomposition potential. Both liquid magnesium and chlorine gas float up under the action of the density difference. The liquid magnesium is brought...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C3/04C25C7/06
Inventor 朱福兴马尚润苗庆东李开华
Owner CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD
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