Process strengthening for electrochemical reduction of solid TiO_(2) to Ti in situ  

作　　者：Chang-Long Guan Ting-An Zhang Jian-She Chen Zhi-He Dou 

机构地区：[1]Key Laboratory for Ecological Utilization of Multimetallic Mineral,Ministry of Education,Northeastern University,Shenyang,110819,China [2]School of Environmental and Chemical Engineering,Shenyang ligong University,Shenyang,110159,China

出　　处：《Rare Metals》2023年第6期2104-2112,共9页稀有金属（英文版）

基　　金：financially supported by the National Key Basic Research Program of China (No.2013CB6326062);the Fundamental Research Funds for the Central Universities (Nos.N110202003 and N130102002);the National Natural Science Foundation of China (Nos.51274064 and 51422403)。

摘　　要：In this paper,a new electrolysis device was presented with corundum crucible as an electrolytic cell in place of a graphite crucible,and in the corundum crucible a sleeve with a cathode pellet with a fluted base placed flat in it was adopted to separate the cathode and anode.The process of electrochemical reduction of solid TiO_(2) to Ti in situ was studied and characterized by the time-current curves and X-ray diffraction(XRD) patterns of the electrochemical reduction products.The influence of CaCl_(2)doping in the cathode and the electrolysis device structures on electrochemical reduction mechanisms and the process strengthening was systematically studied.The results show that the oxygen content in the obtained Ti is reduced to0.51% with a cathode pellet sintering temperature of1000 ℃,sample preparation pressure of 20 MPa and CaCl_(2) doping amount of 30%.Tiny holes are formed in the cathode pellet by CaCl_(2) doping in the electrochemical reduction process,which could increase the contact area between the electrolyte and cathode and improve the electrode reaction efficiency.The new electrolysis device could reduce the carbon content in the molten salt,cathode polarization and the electrode reaction overvoltage,inhibit the chances of secondary reactions,increase the contact area between the produced Ca and cathode and strengthen the thermal reduction of TiO_(2) by Ca.

关 键 词：TITANIUM Calcium chloride Electrochemical reduction Electrolytic cell Cyclic voltammetry 

分 类 号：TF823[冶金工程—有色金属冶金]