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Method and electrolytic tank for producing metal titanium through directive electrolysis of titanium dioxide

A technology of titanium dioxide and electrolytic cells, applied in the field of electrolytic cells, can solve the problems that the reducing agent Ca regeneration ability is not enough to support a long-term, continuous reduction process, slow solid phase migration process, slow electrolysis rate, etc., to achieve continuous The production process, simplify the reduction process route, increase the effect of corrosion resistance

Inactive Publication Date: 2012-10-10
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the same time, the oxygen removed by the anode is introduced into the molten salt and circulates to participate in the discharge process on the anode, resulting in a waste of electricity
The slow electrolysis rate of the FFC method is mainly due to the limitation of the deoxidation link: the oxygen removal process has to go through four steps: liberalization, cathode solid-phase migration, ion molten salt migration and anode reaction. The ionization process and solid phase migration process are slow, thereby delaying the overall electrolysis process
OS method reduces the interface to TiO 2 The contact interface between particles and molten salt has certain advantages in terms of kinetics, but the regeneration ability of the reducing agent Ca is not enough to support the long-term and continuous reduction process

Method used

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  • Method and electrolytic tank for producing metal titanium through directive electrolysis of titanium dioxide

Examples

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Effect test

Embodiment 1

[0026] The KCl-LiCl molten salt with a molar ratio of 47.0:53.0 was dehydrated at 300°C for 12 hours and transferred to a graphite crucible while it was still hot, and the temperature was rapidly raised to 450°C in the reactor for melting (the upper cover was filled with circulating cooling water ), the molten salt depth is controlled at 1 / 2 to 2 / 3 of the height of the reactor, and the time required for the heating and melting process does not exceed 30 minutes. The pre-electrolysis process was carried out at 2.0V and 0.5h with the iron-chromium-aluminum high-temperature-resistant conductor as the pre-electrolysis cathode and the graphite crucible as the anode. Introduce 600ml / min high-purity argon gas into the YSZ tube for 0.5h, then add 300g solid metal sodium, seal the upper cover and YSZ tube, install the cathode wire and continue to inject high-purity argon gas. Connect the above-mentioned combined cathode to the upper cover of the electrolytic cell and slowly lower the c...

Embodiment 2

[0029] A certain amount of KCl-LiCl molten salt with a molar ratio of 40.8:59.2 was dehydrated at 300°C for 12 hours and transferred to a graphite crucible while it was still hot, and the temperature was rapidly raised to 450°C in the reactor for melting (the upper cover was circulated Cooling water), the depth of molten salt is controlled at 1 / 2 to 2 / 3 of the height of the reactor, and the time required for the heating and melting process does not exceed 30 minutes. The pre-electrolysis process was carried out at 2.0V and 0.5h with the iron-chromium-aluminum high-temperature-resistant conductor as the pre-electrolysis cathode and the graphite crucible as the anode. Introduce 600ml / min high-purity argon gas into the YSZ tube for 0.5h, then add 300g solid metal sodium, seal the upper cover and YSZ tube, install the cathode wire and continue to inject high-purity argon gas. Connect the above-mentioned combined cathode to the upper cover of the electrolytic cell and slowly lower ...

Embodiment 3

[0032] A certain amount of KCl-LiCl molten salt with a molar ratio of 40.8:59.2 was dehydrated at 300°C for 12 hours and transferred to a graphite crucible while it was still hot, and the temperature was rapidly raised to 450°C in the reactor for melting (the upper cover was circulated Cooling water), the depth of molten salt is controlled at 1 / 2 to 2 / 3 of the height of the reactor, and the time required for the heating and melting process does not exceed 30 minutes. The pre-electrolysis process was carried out at 2.0V and 0.5h with the iron-chromium-aluminum high-temperature-resistant conductor as the pre-electrolysis cathode and the graphite crucible as the anode. Introduce 600ml / min high-purity argon gas into the YSZ tube for 0.5h, then add 400g solid metal sodium, seal the upper cover and YSZ tube, install the cathode wire and continue to inject high-purity argon gas. Connect the above-mentioned combined cathode to the upper cover of the electrolytic cell and slowly lower ...

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Abstract

The invention belongs to the non-ferrous metallurgy field and discloses a method and an electrolytic tank for producing metal titanium through directive electrolysis of titanium dioxide. According to the method, titanium dioxide powder serves as a raw material, liquid metal sodium serves as a cathode reduction medium, the titanium dioxide powder enters the cathode of the metal sodium continuously for a reduction reaction under a joint action of a spirally feeding mode and argon flow serving as a carrier gas, and an electrolytic product is highly purified sponge titanium powder; and oxygen ions are released during the electrolytic process, enter KC1-NaC1 binary mixed molten salt through a stable zirconia solid oxygen permeable membrane of yttrium oxide under the effect of an electric field, transfer to a graphite anode for an electrochemical reaction, and then are discharged. The producing process is capable of producing the metal titanium through direct and rapid reduction of the titanium dioxide powder and producing continuously, high in current efficiency and deoxidation efficiency, strong in regeneration capacity of a reducing agent, simple and suitable for industrial applications.

Description

[0001] technical field [0002] The invention belongs to the field of non-ferrous metal metallurgy, and in particular relates to a novel molten salt electrolysis technique for directly preparing elemental titanium metal by using titanium dioxide as a raw material and an electrolytic cell involved. Background technique [0003] The method commonly used in the production of sponge titanium industry in the world is the Kroll process. The Kroll method mainly uses metal Mg to reduce TiCl 4 Process, vacuum separation process to manufacture titanium metal. The process consists of three parts: one is to prepare refined TiCl from titanium-containing minerals 4 ; The second is the reduction of TiCl by magnesium 4 The reduction process of producing sponge titanium; the third is vacuum distillation, purification and regeneration of magnesium. In the reduction process, liquid TiCl 4 Feed from the top of the reactor and flow through the molten Mg for reduction, and deposit at the bot...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C3/26
Inventor 郭占成蔡卓飞张志梅
Owner UNIV OF SCI & TECH BEIJING
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