The Formation Of CatiO₃and Its Influence Of Electrolysis

Titanium is named the third metal after Ferrum and Aluminum，which has theadvantages of corrosion resistance, fatigue resistance, toughness, high specific strength,etal. In aerospace、civil、medicine industry, sailing and other fields, there are wide rangeof applications. In recent years, the demand of metal titanium increase gradually. Butthe metal titanium preparation process of industrialization—Kroll method, has somedisadvantages, making the use of metal titanium high cost, and limit the widespread useof metal titanium. FFC method is one of molten salt electrolysis and green technologyfor titanium,which is expected to replace the traditional process, domestic and foreignresearchers also do a lot of research work.Now, in the laboratory scope, this process hasbeen successful preparation of metal titanium, and widely used in other metal and alloypreparation.But FFC method has to improve electrolytic efficiency, and further study isneeded for improvement.Because titanium has a variety of valence, when FFC electrolysis method preparetitanium,the production is variety, reaction mechanism is complex. In the electrolyticprocess, middle products are easy to form, then influence the electrolysis, CaTiO₃isamong them.In order to further research the formation of CaTiO₃and how to influenceelectrolysis, this paper studied the following two aspects.The study of the formation of CaTiO₃mainly include the research of CaO and Ca2+which play a dominant role of the formation of CaTiO₃. Thermodynamics theorycalculate for the hydrolysis of CaCl₂is done. Through the different temperature gibbsfree energy calculation analysis whether the hydrolysis of CaCl₂is easy and form CaOfor CaTiO₃in the range of experiment temperature; Through sample detection ofsintered samples including CaCl₂in argon and in air atmosphere; CaO+TiO2（1:1）;CaCl₂+TiO2（1:1）; untreated CaCl₂; sintered TiO2+CaCl₂in argon; unsintered TiO2+CaCl₂in argon to confirm the effect of CaO and Ca2+to the formation of CaTiO₃. Theresults show that in the temperature range CaCl₂is not easy to hydrolysis producingCaO, CaO played a secondary role for the formation of CaTiO₃, the main function ofCaCl₂is providing Ca2+for CaTiO₃, and Ca2+played a main role for the formation ofCaTiO₃.Comparative study on the electrolysis difference of in situ CaTiO₃and ex situCaTiO₃under different time and different voltage is done, and the effect factors of in situ CaTiO₃is studied.Study on the electrolysis results of in situ CaTiO₃and ex situ CaTiO₃underdifferent time is done through crystal structure, microstructure, pore structure analyzethe effect factors of in situ CaTiO₃; Study on the electrolysis results of ex situ CaTiO₃under different voltage for study on the effect of electrolytic driving force.The results show that crystal structure distortion of CaTiO₃may promote theelectrolysis; large specific surface area may form more active-sites; pore structure ofCaTiO₃may influence the migration of ions;in different electrolytic stages, there arebest electrolytic voltage for electrolysis, the existence of the side effects can affectelectrolytic driving force.