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采用电化学还原法,温度为900℃,在CaCl2熔盐中以烧结的TiO2与钛铁矿混合物(Ti∶Fe=1∶1原子比)为阴极,石墨棒为阳极,制备出了高钛铁合金。探讨了混合物烧结后的相组成变化及高钛铁合金的合金化历程。实验结果表明,混合物烧结后,TiO2由锐钛矿结构转变为金红石结构,钛铁矿转化为热力学稳定的Fe2TiO5。钛铁矿的晶体结构由烧结前的三方晶系经950℃以上烧结后,转变为斜方晶系的Fe2 TiO5。制备出的高钛铁中铁钛含量分别为:77.19%和9.68%(质量分数)。其合金化历程为:TiO2先生成CaTiO3,然后继续脱氧还原为金属钛;钛铁矿优先还原出金属铁,然后与生成的金属钛发生合金化反应生成钛铁合金。表明熔盐电解TiO2与钛铁矿的混合物是一条制备高钛铁合金的新途径。优化电解条件提高电流效率可进一步提高电解速度,得到质量更高的高钛铁合金。
Using electrochemical reduction method, the temperature is 900 ℃, sintered in the CaCl2 molten salt with ilmenite mixture (Ti: Fe = 1: 1 atomic ratio) as the cathode, the graphite rod as the anode, prepared a high titanium ferroalloy . The phase composition changes after sintering and the alloying process of high titanium alloy were discussed. The experimental results show that after the mixture is sintered, TiO2 is transformed from anatase to rutile and ilmenite into thermodynamically stable Fe2TiO5. The crystal structure of ilmenite is transformed into orthorhombic Fe2TiO5 by the sintering of the trigonal system before sintering at above 950 ℃. The content of iron titanium in the prepared high titanium iron is respectively 77.19% and 9.68% (mass fraction). The alloying process is as follows: TiO2 into CaTiO3, and then continue to deoxidation to metal titanium; ilmenite priority to restore the metal iron, titanium alloy and then generated alloying reaction of titanium iron alloy. It is indicated that the mixture of TiO2 and ilmenite from molten salt electrolysis is a new way to prepare high titanium ferroalloy. Optimize the electrolysis conditions to improve the current efficiency can further improve the electrolysis speed to get higher quality high titanium ferroalloy.