含钛废渣熔盐电脱氧法制备钛铁合金  

Preparation of ferrotitanium alloy by molten salt electrolysis from waste residue containing titanium

作　　者：卢洪鹏 陈朝轶[1,2] 王博 刘江 向明亮 袁再燕 LU Hong-peng;CHEN Chao-yi;WANG Bo;LIU Jiang;XIANG Ming-liang;YUAN Zai-yan(College of Materials and Metallurgy,Guizhou University,Guiyang 550025,Guizhou,China;Guizhou Province Key Laboratory of Metallurgical Engineering and Process Energy Saving,Guiyang 550025,Guizhou,China)

机构地区：[1]贵州大学材料与冶金学院,贵州贵阳550025 [2]贵州省冶金工程与过程节能重点实验室,贵州贵阳550025

出　　处：《中国冶金》2021年第3期82-86,共5页China Metallurgy

基　　金：国家自然科学基金资助项目(51664005);贵州省科技计划资助项目(黔科合平台人才[2017]5626);贵大SRT基金资助项目((2018)316号)。

摘　　要：以泡沫镍包裹含钛废渣和Fe_(2)O_(3)混合物为阴极,碳棒为阳极,在900℃、3.1V、CaCl_(2)熔盐电解质中,采用熔盐电脱氧法制备钛铁合金,重点考查阴极成型压力对微观形貌及电解效果的影响。结果表明,烧结后阴极片孔隙率随着成型压力的增加而减小,当成型压力为2MPa时,烧结后阴极片孔隙率为39.5%,具有良好的电化学活性,电解产物颗粒尺寸均匀、氧含量低、呈明显海绵态,产物主要为FeTi和少量Fe_(2)Ti;随着成型压力的增加,电解产物逐渐致密化,发生脱氧反应的三相界面降低,阴极内部的氧离子迁移受阻,导致电脱氧效果变差,产物中出现TiO。电解初期电流迅速下降,20min后趋于平缓,150min后出现增加的趋势。Ferrotitanium alloy was prepared by molten salt electrolysis in CaCl_(2)molten salt electrolyte at 900℃and 3.1Vusing nickel foam wrapped titanium slag and Fe_(2)O_(3)mixture as cathode and carbon rod as anode.The influence of cathode forming pressure on the microstructure and electrolysis effect was investigated.The results showed that the porosity of the sintered cathode decreased with the increase of the molding pressure.When the molding pressure was 2MPa,the porosity of the sintered cathode was 39.5%,and the cathode sheet had good electrochemical activity.The electrolytic products had uniform particle size,low oxygen content and obvious sponge state,which were mainly FeTi and a small amount of Fe_(2)Ti.With the increase of molding pressure,the electrolytic products became dense gradually,the three-phase interface of the deoxidization reaction was reduced,and the oxygen ion migration in the cathode was blocked,resulting in the deterioration of the electro-deoxidation effect and the appearance of TiO in the products.The current decreased rapidly at the beginning of electrolysis,then tended to be flat after 20min and increased after 150min.

关 键 词：含钛废渣 熔盐电脱氧 孔隙率 Fe-Ti合金 阴极结构 成型压力 

分 类 号：TF651[冶金工程—钢铁冶金] X758[环境科学与工程—环境工程]