东北大学学报(自然科学版) ›› 2025, Vol. 46 ›› Issue (11): 66-72.DOI: 10.12068/j.issn.1005-3026.2025.20240111

• 材料与冶金 • 上一篇    下一篇

TiO2碳热还原机理及影响因素的研究

张国鹏1, 沈峰满1(), 章苇玲1,2, 郑海燕1   

  1. 1.东北大学 冶金学院,辽宁 沈阳 110819
    2.宝钢湛江钢铁有限公司 制造管理部,广东 湛江 524072
  • 收稿日期:2024-05-14 出版日期:2025-11-15 发布日期:2026-02-07
  • 通讯作者: 沈峰满
  • 作者简介:张国鹏(1995—),男,山西运城人,东北大学博士研究生
  • 基金资助:
    国家自然科学基金资助项目(52274322);国家自然科学基金资助项目(52074072)

Research on Mechanism and Influencing Factors of TiO2 Carbothermal Reduction

Guo-peng ZHANG1, Feng-man SHEN1(), Wei-ling ZHANG1,2, Hai-yan ZHENG1   

  1. 1.School of Metallurgy,Northeastern University,Shenyang 110819,China
    2.Department of Technical Management,Baosteel Zhanjiang Iron and Steel Co. ,Ltd. ,Zhanjiang 524072,China.
  • Received:2024-05-14 Online:2025-11-15 Published:2026-02-07
  • Contact: Feng-man SHEN

摘要:

高炉冶炼钒钛磁铁矿过程中TiO2过度还原会严重影响高炉顺行.基于TiO2碳热还原热力学计算,并采用失重法探究温度、气氛及还原剂类型对TiO2碳热还原过程的影响.结果表明,固溶体Ti(C x,N y )的生成起始反应温度随着TiC摩尔分数的增加而升高;相同温度下,TiN在Ti(C x,N y )中的摩尔分数随N2分压增加而增大;相同反应时间内,TiO2的还原度随温度升高而增加;在Ar和N2气氛中,TiO2可与石墨发生碳热还原反应生成TiC及TiN,而在空气和CO2气氛中石墨会优先与空气中的O2及气氛中的CO2发生氧化反应;在所有还原剂中,TiO2与石墨的反应难度最大,提高入炉焦炭的石墨化程度可有效抑制高炉中TiO2的过度还原.

关键词: 钒钛磁铁矿, TiO2, 碳热还原, Ti(C x,N y )固溶体, 还原度

Abstract:

Excessive reduction of TiO2 in the process of smelting vanadium-bearing titanomagnetite in the blast furnace has a great effect on the smooth operation of the blast furnace. Based on the thermodynamic calculation of the carbothermal reduction of TiO2, the effects of the temperature, atmosphere, and the type of reductant on the carbothermal reduction process of TiO2 were explored by the loss-in-weight method. The results indicate that the starting reaction temperature of Ti(C x,N y ) solid solution increases with the increase in the mole fraction of TiC. The mole fraction of TiN in Ti(C x,N y ) increases with the increase in the partial pressure of N2 at the same temperature. The reduction degree of TiO2 increases with the increase in temperature within the same reaction time. TiO2 can be reduced to produce TiC or TiN with graphite under the atmospheres of Ar or N2, while in the air and CO2 atmosphere, graphite will be oxidized with O2 and CO2. Of all the reductants, TiO2 has the greatest difficulty in undergoing carbothermal reduction with graphite. Increasing the graphitization degree of the coke in the blast furnace is conducive to inhibiting the excessive reduction of TiO2 in the blast furnace.

Key words: vanadium-bearing titanomagnetite, TiO2, carbothermal reduction, Ti(C x,N y )solid solution, reduction degree

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