Preparation of Ti Powder by Calciothermic Reduction of TiO2 in Vacuum Atmosphere
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摘要: 用金属钙做还原剂直接还原TiO2制备金属钛是一种流程短、成本较低的新工艺。研究了真空炉中1 000℃条件下还原时间和添加剂(CaCl2)用量对还原产物的影响,结果表明,在TiO2和CaCl2质量比为1∶4时,还原时间1.5 h后TiO2全部转化为金属钛;添加剂CaCl2可以促进TiO2还原反应的进行。对CaCl2和TiO2质量比为1∶2,还原时间6 h的还原产物进行酸洗后得到的钛粉分别进行XRD、EDS和氧氮含量分析检测,结果表明钛粉的纯度很高,钛粉的氧含量为1 000×10-6,氮含量为170×10-6。Abstract: Calciothermic reduction of titanium oxide is a new process to prepare titanium powder with short route and low cost.In this paper,effect of the amount of additive(CaCl2) and reduction time on reduced products is studied at 1000℃ in vacuum atmosphere.The results show all the titanium oxide is converted into Ti metal after reduction for 1.5 h when mass ratio of CaCl2 to TiO2 in raw materials is 1:4 and the reduction reaction can be promoted with the addition of CaCl2.After pickling,the obtained Ti powder was detected by X-ray diffractometer,scaning electron microscopy,and oxygen and nitrogen analyzer.It is found that there is no metallic impurity other than Ti in the titanium powder with oxygen content of 1 000×10-6,nitrogen content of 170×10-6.
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Key words:
- Ti powder /
- TiO2 /
- calciothermic reduction /
- vacuum /
- additive /
- reduction time
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