阴极结构对熔盐电脱氧法制备金属钛影响及杂质研究

Study on the effect of molten salt electro-deoxidation on the preparation of titanium metal

在高纯氩气气氛下,在CaCl_(2)熔盐中电解高钛渣制备金属钛,研究了成型压力与阴极片孔隙率的关系以及对电解过程的影响,并采用XRD、SEM等分析手段对阴极片及电解后的物相和微观形貌结构进行表征。结果表明:成型压力对阴极片孔隙率有直接影响,随着成型压力升高,阴极孔隙率下降;阴极片的孔隙率直接影响电脱氧过程,适当的孔隙率有利于形成中间产物CaTiO_(3)和提高电还原速率。4 MPa压制的阴极1050℃烧结2 h,孔隙率为34.79%,电解12 h产物氧含量降低至1.75%,钛含量为95.72%,此时阴极片的电化学性能较好。

Titanium metal was prepared by electrolysis of high titanium slag in CaCl_(2) molten salt under a high-purity argon atmosphere.The relationship between forming pressure and porosity of cathode sheet as well as the influence on the electrolysis process were studied.The phases and microstructures of the cathode sheet and that after electrolysis were characterized by XRD and SEM.The results showed that the forming pressure had a direct influence on the porosity of the cathode sheet,which decreased with the increase of the forming pressure.The porosity of the cathode sheet directly affected the electrode deoxidation process,and an appropriate porosity was beneficial to the formation of intermediate product CaTiO_(3) and the increase of the electroreduction rate.The porosity of the cathode pressed by 4 MPa is 34.79%when sintered at 1050℃for 2 h,and the oxygen content of the product is reduced to 1.75%and titanium content is 95.72%when electrolyzed for 12 h,which shows a better electrochemical performance of the cathode sheet.