Powder Metallurgical Preparation Of Titanium Dioxide Cathode And Behavioral Research Of Molten Salt Electrolysis Deoxidizing

Titanium has many excellent performances such as corrosion resistance, nonmagnetic, strong aspect ratio and so on, therefore it has been widely used in aerospace, naval, chemical industry, medical equipment, etc. With the rapid progress and development of technology and economy, the demand for titanium in various fields is significantly increasing. But the high preparing cost of titanium restricted the development of titanium industry. Thus the study of preparing titanium by fused salt electrolysis from TiO2is very meaningful.In this paper, a powder metallurgy processed TiO2electrode slice was used as negative pole for fused salt electrolytic deoxidizing experiment, which was proceeded at900℃with the circulating Ar gas as protection environment, under the new concept of two electrolysis steps. The study focused on the the powder metallurgy technique, preferences and control of the main parameters in the process of molten salt electrolysis. The main conclusions were listed as follows:1) The phase composition of TiO2electrode slice, the size of micro particle, microstructure, porosity and strength and other factors were comprehensively studied, and the optimized preparation technique of the negative pole was determined:doping content of carbon powder with5%, forming at30MPa pressing pressure, heat preservation at950℃for4hours.2) Excess crystal water in molten salt was adverse for the electrolytic experiment. It could be removed through preelectrolysis method, and the main parameters for electrolysis:2.4V constant voltage electrolyzing for15hours.3) In the three factors of porosity, electrolytic time and electrolytic temperature, the efficiency of electrolysis was greatest impacted by electrolytic time, and the second factor was porosity.4) The decompression voltage of titanium oxide was increasing gradually with the decrease of valence of titanium elements. The low valence of titanium was the constraint condition of the electricity deoxidization process during the electrolytic process. 5) Puts forward two step electric solution,①using TiO2as the cathode, graphite electrodes as the electrolysis anode, to get the cathode product (titanium protoxide) with most of the oxygen removed;②using the cathode products for anode, metal titanium plate as the cathode for second electrolysis, we can get metal titanium in the cathode.