The Research Of Influencing Factors Of Electrolytic Efficiency On Electrolysis In The Preparation Of Ti By Electro-Deoxidation In A Eutectic Melt

Titanium is a kind of functional material with superior performance in variousfields such as gas sensor, thin film capacitors, photocatalyst, solar cells, and has a wideapplication. But at present, the preparation methods of titanium can not meet the needsof its wide application, so researchers have been seeking some new processes of makingtitanium. Among all kinds of methods, a typical metallurgical process of TiO₂deoxidation, named FFC, is the best and promising technique considered by scientists.In this research, based on FFC process, titanium were obtained successfully andTiO₂electrolytic efficiency were improve by a series of experimental scheme. Theinfluences of different experiment condition （atmosphere, voltage, temperature, moltensalt） on the composition and microstructure of TiO₂cathode and cathodic productselectrolysed, and the effects of different scale samples on electric current wereinvestigated. The CaTiO₃（electrolytic form CaTiO₃and doping of the CaTiO₃） to theinfluence of electrolytic efficiencywere examined. The main contents of thisdisquisition are summarized as following:In various studying experimental conditions, argon atmosphere avail the generationof oxygen ion, under the action of voltage form the double layer, make ionized oxygen,form TiO_2-xion structure can improve the ability of the conductive TiO₂cathode. And inthe high temperature conditions, TiO₂crystals form the titanium low oxide (TiO_2-x), socaused oxygen open, molten salt ion penetration to TiO₂cathode internal, increase theelectric ion number, which affects the conductivity of the cathode. Activation electrodeto improve TiO₂cathode electrode conductive ability is important control steps. At thesame time in the same experimental conditions, with the increase of the cathode samplequality, the oxygen content of electrolysis product lower, Titanium relative content rise.Because the quality was less, the sample suppressed thickness is smaller, can shortenthe oxygen diffusion path for electrolytic deoxidization, so as to improve the efficiencyof electrolysis. The formation of CaTiO₃made the structure of the cathode film becamecompact, and specific surface area decreased, and then the migration of O^2-wasinhibited, and the effective reaction area of electrolysis was redcued, and hence TiO₂electrolytic efficiency was lowered.TiO₂of doping CaTiO₃makes deoxidizing of electrolysis products become full, andshorten the electrolysis time, improve electrolysis efficiency, as the quality of doping CaTiO₃were gradually enhance, efficiency electrolysis were increased. By the sinteringprocess, the doping CaTiO₃pore were larger, which were as the growth interface ofCaTiO₃product in a process of electrolysis, promote the diffusion and transfer of O^2-;And the doping TiO₂directly electrolysis generate distortion CaTiO₃grid type, whichwere to remove from Ca²⁺、O^2-in electrolytic stage.the doping CaTiO₃as crystal nucleuscan generate granular CaTiO₃In a relatively short time, which increase the electrolyticeffective reaction area and osteoporosis of the cathode structure. It make for Ca²⁺, O^2-tomigration, while improving the cathode electrical conductivity. Therefore, the dopingCaTiO₃make for electricity deoxidization, shorten the electrolytic time, so it enhancethe electrolysis efficiency of TiO₂.