工程科学学报，第40卷，第5期：548-556,2018年5月 Chinese Journal of Engineering,Vol.40,No.5:548-556,May 2018 DOI:10.13374/j.issn2095-9389.2018.05.004;http://journals.ustb.edu.cn 红格含铬钒钛磁铁矿球团矿物学和等温氧化动力学 汤卫东)，薛向欣12)四，杨松陶)，姜涛12) 1)东北大学治金学院，沈阳1108192)辽宁省治金资源循环科学重点实验室，沈阳110819 ☒通信作者，E-mail:xuexx(@mail.neu.cdh.cm 摘要研究了红格钒钛磁铁矿(HCVTM)球团等温氧化动力学及其矿物学特征.在不同的温度(1073~1373K)和不同的时 间(10~60m)范围内，对HCVTM球团矿进行了等温氧化动力学实验.首先分析了球团在不同温度和时间下的微观结构和 矿物组成规律.然后根据定义的氧化率，计算和分析了氧化率及其变化规律，以及矿相结构对氧化率的影响.最后结合缩核 模型、修正的氧化率函数和阿伦尼乌斯公式，计算了反应速度常数、修正系数和反应活化能，并判断了反应限制性环节.研究 表明：随温度的提高，低熔点液相增加，赤铁矿晶粒的生成、长大和再结晶，形成连续的黏结相，空隙数量减少.随时间的增加， 生成的液相促进了赤铁矿晶粒间的黏结和长大，但是晶粒间硅酸盐相和钙钛矿类物相恶化了球团结构.同时，钙钛矿和铁板 钛矿相生成.HCVTM球团矿空隙数量的减少和黏结相的生成，表现在氧化速率随时间增加而减慢.HCVTM球团氧化反应主 要受扩散控制，球团氧化前期的反应活化能为13.74k·mol1,氧化后期的活化能为3.58k·mol1,氧化率函数的修正参数山2 =0.03. 关键词红格含铬钒钛磁铁矿：球团：等温氧化动力学：氧化率：矿物学 分类号TF046.6 Mineralogical characteristics and isothermal oxidation kinetics of Hongge chromium containing vanadium and titanium magnetite pellets TANG Wei-dong),XUE Xiang-xin'),YANG Song-tao),JIANG Tao'2) 1)School of Metallurgy,Northeastern University,Shenyang 110819,China 2)Liaoning Key Laboratory of Recycling Science for Metallurgical Resources,Shenyang 110819,China Corresponding author,E-mail:xuexx@mail.neu.edu.cn ABSTRACT The isothermal oxidation kinetics and mineralogical characteristics of Hongge chromium containing vanadium and titani- um magnetite (HCVTM)pellets were investigated.The experiments related to the isothermal oxidation kinetics were performed over a temperature range of 1073 to 1373K and a time range of 10 to 60min.First,the microstructure and variations in the mineral composi- tion of the pellets were analyzed.Further,the oxidation rate and its change regulation were calculated and analyzed by combining the defined oxidation rate function,and the effects of the mineral phase structures on the rate of oxidation were determined.Finally,the modified oxidation rate function,Arrhenius equation,reaction rate constant,correction factor,and reaction activation energy were cal- culated by combining the shrinking core model,and the restrictive step in the oxidation reaction was determined.The results depict that an increase in temperature causes an increase in the low melting point liquid phase;formation,growth,and recrystallization of hematite grains;and formation of a bonding phase.Additionally,it causes a decrease in the number of interspaces.With an increase in time, the bonding and growth of hematite grains are promoted due to the generation of a liquid phase.However,the structure of pellets is ob- served to deteriorate due to the formation of silicate and perovskite phases.Meanwhile,perovskite,and pseudobrookite phases are also 收稿日期：2017-07-07 基金项目：国家重点基础研究发展计划资助项目(2013CB632603):国家科技支撑计划资助项目(2015BAB19B02):国家自然科学基金资助项 目(51090384,51174051,51574082)工程科学学报,第 40 卷,第 5 期:548鄄鄄556,2018 年 5 月 Chinese Journal of Engineering, Vol. 40, No. 5: 548鄄鄄556, May 2018 DOI: 10. 13374 / j. issn2095鄄鄄9389. 2018. 05. 004; http: / / journals. ustb. edu. cn 红格含铬钒钛磁铁矿球团矿物学和等温氧化动力学 汤卫东1) , 薛向欣1,2) 苣 , 杨松陶1) , 姜 涛1,2) 1) 东北大学冶金学院, 沈阳 110819 2) 辽宁省冶金资源循环科学重点实验室, 沈阳 110819 苣 通信作者,E鄄mail: xuexx@ mail. neu. edu. cn 摘 要 研究了红格钒钛磁铁矿(HCVTM)球团等温氧化动力学及其矿物学特征. 在不同的温度(1073 ~ 1373 K)和不同的时 间(10 ~ 60 min)范围内,对 HCVTM 球团矿进行了等温氧化动力学实验. 首先分析了球团在不同温度和时间下的微观结构和 矿物组成规律. 然后根据定义的氧化率,计算和分析了氧化率及其变化规律,以及矿相结构对氧化率的影响. 最后结合缩核 模型、修正的氧化率函数和阿伦尼乌斯公式,计算了反应速度常数、修正系数和反应活化能,并判断了反应限制性环节. 研究 表明:随温度的提高,低熔点液相增加,赤铁矿晶粒的生成、长大和再结晶,形成连续的黏结相,空隙数量减少. 随时间的增加, 生成的液相促进了赤铁矿晶粒间的黏结和长大,但是晶粒间硅酸盐相和钙钛矿类物相恶化了球团结构. 同时,钙钛矿和铁板 钛矿相生成. HCVTM 球团矿空隙数量的减少和黏结相的生成,表现在氧化速率随时间增加而减慢. HCVTM 球团氧化反应主 要受扩散控制,球团氧化前期的反应活化能为 13郾 74 kJ·mol - 1 ,氧化后期的活化能为 3郾 58 kJ·mol - 1 ,氧化率函数的修正参数 u2 = 0郾 03. 关键词 红格含铬钒钛磁铁矿; 球团; 等温氧化动力学; 氧化率; 矿物学 分类号 TF046郾 6 收稿日期: 2017鄄鄄07鄄鄄07 基金项目: 国家重点基础研究发展计划资助项目(2013CB632603);国家科技支撑计划资助项目(2015BAB19B02);国家自然科学基金资助项 目(51090384,51174051,51574082) Mineralogical characteristics and isothermal oxidation kinetics of Hongge chromium containing vanadium and titanium magnetite pellets TANG Wei鄄dong 1) , XUE Xiang鄄xin 1,2) 苣 , YANG Song鄄tao 1) , JIANG Tao 1,2) 1) School of Metallurgy, Northeastern University, Shenyang 110819, China 2) Liaoning Key Laboratory of Recycling Science for Metallurgical Resources, Shenyang 110819, China 苣 Corresponding author, E鄄mail: xuexx@ mail. neu. edu. cn ABSTRACT The isothermal oxidation kinetics and mineralogical characteristics of Hongge chromium containing vanadium and titani鄄 um magnetite (HCVTM) pellets were investigated. The experiments related to the isothermal oxidation kinetics were performed over a temperature range of 1073 to 1373 K and a time range of 10 to 60 min. First, the microstructure and variations in the mineral composi鄄 tion of the pellets were analyzed. Further, the oxidation rate and its change regulation were calculated and analyzed by combining the defined oxidation rate function, and the effects of the mineral phase structures on the rate of oxidation were determined. Finally, the modified oxidation rate function, Arrhenius equation, reaction rate constant, correction factor, and reaction activation energy were cal鄄 culated by combining the shrinking core model, and the restrictive step in the oxidation reaction was determined. The results depict that an increase in temperature causes an increase in the low melting point liquid phase; formation, growth, and recrystallization of hematite grains; and formation of a bonding phase. Additionally, it causes a decrease in the number of interspaces. With an increase in time, the bonding and growth of hematite grains are promoted due to the generation of a liquid phase. However, the structure of pellets is ob鄄 served to deteriorate due to the formation of silicate and perovskite phases. Meanwhile, perovskite, and pseudobrookite phases are also