【作者】 邢伟；

【导师】 许茜；

【作者基本信息】 东北大学 ， 冶金物理化学， 2009， 硕士

【摘要】 本文基于我国丰富的钛铁矿资源现状以及现行钛铁合金生产工艺中所存在的高能耗、高成本等问题,采用熔盐电脱氧法,在900℃CaCl2-NaCl共晶熔盐中直接电解还原高钛渣制备高钛铁合金,为本实验室下一步采用熔盐电脱氧法直接电解钛铁矿制备钛铁合金做准备,希望最终实现钛铁矿资源低成本、低能耗的综合利用。采用熔盐电脱氧法电解人工合成钛铁复合氧化物,制备出铁钛合金。考查了不同的烧结温度对阴极片的相组成、微观形貌以及对阴极电脱氧效果的影响,确定适宜的阴极片烧结温度范围是840-900℃。对部分电化学还原样品的XRD、SEM和EDS分析结果表明,钛铁复合氧化物中Fe会被优先还原,Ti的还原过程是逐次进行的,中间产物包括CaTiO3、Ca3(Ti2O7)、Ti3O等,还原得到的金属钛可以与优先还原的铁原位合金化。在电解人工合成钛铁复合氧化物的基础上,进行了熔盐电脱氧法电解高钛渣制备高钛铁合金的相关实验,结果显示在900℃CaCl2-NaCl共晶熔盐体系中采用熔盐电脱氧法直接电解高钛渣能够制备出高钛含量的铁合金,但同时产品中残留有少量的中间产物CaTiO3和Mg、Si、Al等杂质；电解经过碱熔融和酸浸处理的高钛渣可以得到以金属钛为主体相的产品。更多还原

【Abstract】 The reserves of ilmenite is rich in China and there are many factors influenced existing high titanium ferroalloy production process such as high energy consumption, cost. In this paper, the electrochemical reduction of high titanium slag to high titanium ferroalloy in CaCl2-NaCl eutectic molten at 900℃has been performed. The next step will be electrochemical reduction of ilmenite to ferrotitanium alloy with the FFC process and eventually achieve the goal, which is utilization of ilmenite resources low-cost and low power.Titanium-iron complex oxide is electrolyzed to prepare FeTi alloy in molten salts. The study on sintering temperatures of cathode pellets shows that it is good for removing oxygen from the pellets when temperature range from 840 to 900℃. According to the results of partially reduced samples, including XRD, SEM, EDS, it is found that first deoxidize product is iron, then titanium reduction process include some mesophases, like CaTiO3, Ca3(Ti2O7), and Ti3O, finally titanium and iron will form alloy.Based on the electrolysis of titanium-iron complex oxide, high titanium slag, which treated by different processes, is electrolyzed to obtain high-titanium ferroalloy with the FFC process. The results reveal that there is small amount of intermediate, such as CaTiO3, and impurities such as Mg, Si, Al and O staying in the electrolysis product. The product, which main phase is titanium, can be prepared by electrolysis of high titanium dealt with alkali fusion and acid leaching.更多还原