Preparation Of Titanium And Titanium Alloy By Molten Salt Electrolysis Of Calcium Titanate In Short Process

In view of the disadvantages of the traditional molten salt electrolysis method using TiO₂ or Ti Cl₄ as raw material to prepare titanium and titanium alloy,this paper studies the process of preparing titanium and titanium alloy by molten salt electrolysis using CaTiO₃ with a wide range of sources as raw material.The main contents are as follows:Firstly,the analysis of CaTiO₃ solid cathode with different electrolytic time in chloride molten salt shows that the reduction process of CaTiO₃ solid cathode is as follows:CaTiO₃→Ti₂O₃→TiO,Ti₂O→Ti[O]б→Ti.In order to improve the deoxidization speed of CaTiO₃ cathode,the effects of sintering temperature,porosity and electrolytic voltage on the deoxidization speed were compared.The results show that the deoxidization speed is the fastest when the electrolytic voltage is 3.2 V for the cathode sintered at 1200℃without adding poreforming agent.Secondly,the solubility of CaTiO₃ in different molten salts was analyzed,and it was found that fluoride molten salts Na F-Al F₃ and Na F-KF had better solubility of CaTiO₃.The electrochemical study results show that the reduction process of CaTiO₃ in Na F-Al F₃molten salt system is as follows:CaTiO₃→TiO→Ti₂O→Ti,following the law of thermodynamic reduction.In the Na F-KF molten salt system,CaTiO₃ will react with KF to generate K₂TiO₃,and then the titanium metal is reduced in one step.The specific reduction process is as follows:CaTiO₃→K₂TiO₃→Ti.Finally,the deoxidation process of CaTiO₃ in CaTiO₃/Sn composite cathode in chloride and the depolarization reduction process of CaTiO₃ by liquid Sn cathode in fluoride to prepare titanium alloy were studied.The results show that CaTiO₃ in CaTiO₃/Sn composite cathode in chloride would be deoxidized and reduces to Ti₂O₃ first.Ti₂O₃ and the calcium obtained by Ca²⁺reduction in molten salt can directly reduce by calcium thermal reduction.In Na F-KF molten salt system,TiO₃^2-will reduce titanium on liquid Sn electrode and be captured by liquid tin to form Ti-Sn alloy.Figure[72];Table[11];Reference[114]...