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Study on Titanium Dioxide to Titanium in Molten Salt

Author: ChenXiaoLiang
Tutor: TaoChangYuan
School: Chongqing University
Course: Physical and chemical
Keywords: Titanium dioxide Titanium Molten salt Electrolysis Reduction Mechanism
CLC: O614.411
Type: Master's thesis
Year: 2008
Downloads: 171
Quote: 1
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Abstract


Titanium is an excellent structural materials and functional materials, and is an important strategic material in the materials industry and high-tech fields. Prevalence of traditional titanium preparation process complexity, high cost, and energy consumption as well as pollution of the environment and other issues. 2000 Cambridge proposed a direct voltage is applied to the new method (called FFC Cambridge process) so that the metal of the metal oxide electrical deoxy prepared. This method has a short process, does not produce pollutants, etc.. Titanium production process is currently being studied, developed or improved a lot, but most of them are still in the stage of laboratory research. The TiO 2 direct electrochemical reduction from the current situation, is one of the most promising methods. Although the direct electrolysis of TiO 2 titanium or titanium concentrates production difficult Kroll process, its superiority is that it can simplify the process and reduce energy consumption, is worthy of further study and development process, but also the future trends of the titanium metal production. The method of research is still in its infancy, both in terms of the depth and breadth needed further exploration. Laboratory-made electrolytic device, in respect of the year of cathode preparation, molten salt pretreatment, electrolysis equipment improved, the electrolysis process control and other aspects of the FFC process exploratory experimental study, and the electrolysis process basic electrochemical characteristics a preliminary study, focusing on the electrolytic reduction mechanism. Prepared by molten salt electrolysis TiO 2 required for the preparation of titanium sponge TiO 2 electrode, and the cathode of titanium dioxide conductivity study. XRD, XPS product before and after sintering and electrolysis products were analyzed, and the results showed that: high temperature sintering, the electric double layer and the molten salt can change the electrical conductivity of the TiO 2 electrode. High-temperature sintering can be changed a of TiO 2 of the energy band structure, resulting in a large number of conductive space, thereby increasing the conductivity of the electrode; electrode in the electric double layer is formed in the molten salt, the oxygen atom is ionized, and is formed of TiO < sub> 2-x structure and improve the conductivity of the electrode capacity; ion penetration in the molten salt to the electrodes internal to increase the number of conductive ions within the electrode, and improve the conductivity of the electrode capacity. The article also preliminary study O 2 - formation of the migration process and the cathode to think that high temperatures promote the TiO 2 structure oxygen vacancy formed in the molten salt electrolysis system, O, 2 - in the cathode by forming the absence of migration, the perovskite is an inevitable intermediate product of the electrolysis process, the cathode surface generation metal titanium hinder O 2 - migrate from the cathode to the inner layer out layer.

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CLC: > Mathematical sciences and chemical > Chemistry > Inorganic Chemistry > Metal elements and their compounds > Section Ⅳ group metal elements and their compounds > The titanium Vice family ( IV B group metal elements) > Ti Ti
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