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·1330· 北京科技大学学报 第33卷 无成核剂球团相比,表观活化能降低了43.92%,成 (朱德庆,翟勇,潘建.煤基直接还原一磁选超微细贫赤铁矿新 核剂有利于球团的还原.工艺实验结果表明,在相 工艺,中南大学学报:自然科学版,2008,39(6):1132) [6] 同的条件下,成核剂能够使还原产品的金属化率由 Mei X G,Yan M L,Zuo W L,et al.Kinetics of the nucleation 88.38%提高到96.21% and grain growth of metallic phase in direct reduction of high iror red mud with coal base.J Cent South Unig Sci Technol,1996,27 3结论 (2):159 (梅贤恭,袁明亮,左文亮,等.高铁赤泥煤基直接还原中铁品 (1)直接还原过程金属铁晶粒形核热力学研究 粒成核及品核长大动力学.中南工业大学学报,1996,27(2): 159) 表明,成核剂能够使金属铁品粒形核位垒降低50% [7]Li J.A Study on Mechanism and Process of Direct Reduction of Pel- 以上,促进球团中铁晶粒快速形核 lets Made From Concentrate and Composite Binder [Dissertation]. (2)气体等温还原动力学研究表明,成核剂能 Changsha:Central South University,2007 强化赤铁矿球团的还原性能.在还原温度900~ (李建.铁精矿复合粘结剂球团直接还原法工艺及机理研究 1050℃,时间120min,以C0和N,的体积比为30: [学位论文].长沙:中南大学,2007) 70的气体还原气体的条件下,无成核剂球团和成核 8] Mo D C.Metallurgical Kinetics.Changsha:Central South Univer- sity of Technology Press,1987 剂球团皆受气体内扩散控制,两种球团直接还原反 (莫鼎成.治金动力学.长沙:中南工业大学出版社,1987) 应表观活化能分别为18.10kJ·mol-1和10.15kJ· 9]Lang L K,Che Y C.Metallurgical Thermodynamics and Kinetics. mol-',成核剂使球团直接还原反应表观活化能降低 Shenyang:Northeastern University of Technology Press,1982 43.92%. (梁连科,车荫昌.治金热力学及动力学.沈阳:东北工学院出 版社,1982) [10]Qin M S.Non-Blast Furnace Ironmaking.Beijing:Metallurgical 参考文献 Industry Press,1988 [Xu B,Zhuang J M,Bai G H.Study on coal-based direct reduc- (秦民生.非高炉炼铁.北京:治金工业出版社,1988) tion process in utilizing the low-grade and hard-toseparate iron 01] Zhou J C.Study on Dephosphorization Technology for High Phos- ores.Multipurpose Util Miner Resour,2001 (6):20 phorus Oolitic Hematite by Coal Based Direct Reduction [Disserta- (许斌,庄剑鸣,白国华.低品位铁矿煤基直接还原的研究,矿 tion].Wuhan:Wuhan University of Science and Technology 产综合利用,2001(6):20) 2007 ]Zhang J S.Status and trend of exploitation and utilization of iron (周继程.高磷鲕状赤铁矿煤基直接还原法提铁脱磷技术研 ore resource in China.Iron Steel,2007,42(2):1 究[学位论文].武汉:武汉科技大学,2007) (张泾生,我国铁矿资源开发利用现状及发展趋势。钢铁, [12]Li T Q,Wang C Y,Liu X J.Similarities and differences of car- 2007,42(2):1) bonaceous mesophases derived from homogenous and heterogene- Wang Y.Analysis of China iron resource situation and strategy of ous systems.Carbon Tech,2008,27(5):5 its sustainable supply.Met Mine,2008(1):12 (李同起,王成扬,刘秀军.均相成核和非均相成核碳质中间 (王颖.我国铁矿资源形势分析与其可持续供给的策略,金属 相的异同,碳素技术,2008,27(5)5) 矿山,2008(1):12) 03] Liu J H,Zhang J Y,Zhou T P.Assessment of apparent activa- 4]Zhai Y.Investigation on Effective Beneficiation of Microfine Low tion energies for reducing iron oxides by CO and H.J Iron Steel Grade Hematite [Dissertation].Changsha:Central South Univer- Res,2000,12(1):5 siy,2008:46 (刘建华,张家芸,周土平.C0及C0-H2气体还原铁氧化物 (翟勇.低品位微细粒赤铁矿高效利用技术研究[学位论 反应表观活化能的评估.钢铁研究学报,2000,12(1):5) 文].长沙:中南大学,2008:46) [14]Chun T J.Study on Process and Mechanism of Effective Beneficia- [5]Zhu D Q,Zhai Y,Pan J.Beneficiation of super microfine low- tion of Superfine Lone Grade Hematite [Dissertation].Changsha: grade hematite ore by coal-based direct reduction-magnetic concen- Central South University,2010 tration process.J Cent South Unie Sci Technol,2008,39(6): (春铁军.低品位微细粒赤铁矿高效富集技术及机理研究 1132 [学位论文].长沙:中南大学,2010)北 京 科 技 大 学 学 报 第 33 卷 无成核剂球团相比,表观活化能降低了 43. 92% ,成 核剂有利于球团的还原. 工艺实验结果表明,在相 同的条件下,成核剂能够使还原产品的金属化率由 88. 38% 提高到 96. 21%[14]. 3 结论 ( 1) 直接还原过程金属铁晶粒形核热力学研究 表明,成核剂能够使金属铁晶粒形核位垒降低 50% 以上,促进球团中铁晶粒快速形核. ( 2) 气体等温还原动力学研究表明,成核剂能 强化赤铁矿球团的还原性能. 在还原温度 900 ~ 1 050 ℃,时间 120 min,以 CO 和 N2的体积比为 30∶ 70 的气体还原气体的条件下,无成核剂球团和成核 剂球团皆受气体内扩散控制,两种球团直接还原反 应表观活化能分别为 18. 10 kJ·mol - 1 和 10. 15 kJ· mol - 1 ,成核剂使球团直接还原反应表观活化能降低 43. 92% . 参 考 文 献 [1] Xu B,Zhuang J M,Bai G H. Study on coal-based direct reduc￾tion process in utilizing the low-grade and hard-to-separate iron ores. Multipurpose Util Miner Resour,2001( 6) : 20 ( 许斌,庄剑鸣,白国华. 低品位铁矿煤基直接还原的研究,矿 产综合利用,2001( 6) : 20) [2] Zhang J S. Status and trend of exploitation and utilization of iron ore resource in China. Iron Steel,2007,42( 2) : 1 ( 张泾生. 我国铁矿资源开发利用现状及发展趋势. 钢铁, 2007,42( 2) : 1) [3] Wang Y. Analysis of China iron resource situation and strategy of its sustainable supply. Met Mine,2008( 1) : 12 ( 王颖. 我国铁矿资源形势分析与其可持续供给的策略,金属 矿山,2008( 1) : 12) [4] Zhai Y. Investigation on Effective Beneficiation of Microfine Low Grade Hematite[Dissertation]. Changsha: Central South Univer￾sity,2008: 46 ( 翟勇. 低品位微细粒赤铁矿高效利用技术研究[学 位 论 文]. 长沙: 中南大学,2008: 46) [5] Zhu D Q,Zhai Y,Pan J. Beneficiation of super microfine low￾grade hematite ore by coal-based direct reduction-magnetic concen￾tration process. J Cent South Univ Sci Technol,2008,39 ( 6) : 1132 ( 朱德庆,翟勇,潘建. 煤基直接还原--磁选超微细贫赤铁矿新 工艺,中南大学学报: 自然科学版,2008,39( 6) : 1132) [6] Mei X G,Yan M L,Zuo W L,et al. Kinetics of the nucleation and grain growth of metallic phase in direct reduction of high iron red mud with coal base. J Cent South Univ Sci Technol,1996,27 ( 2) : 159 ( 梅贤恭,袁明亮,左文亮,等. 高铁赤泥煤基直接还原中铁晶 粒成核及晶核长大动力学. 中南工业大学学报,1996,27( 2) : 159) [7] Li J. A Study on Mechanism and Process of Direct Reduction of Pel￾lets Made From Concentrate and Composite Binder[Dissertation]. Changsha: Central South University,2007 ( 李建. 铁精矿复合粘结剂球团直接还原法工艺及机理研究 [学位论文]. 长沙: 中南大学,2007) [8] Mo D C. Metallurgical Kinetics. Changsha: Central South Univer￾sity of Technology Press,1987 ( 莫鼎成. 冶金动力学. 长沙: 中南工业大学出版社,1987) [9] Lang L K,Che Y C. Metallurgical Thermodynamics and Kinetics. Shenyang: Northeastern University of Technology Press,1982 ( 梁连科,车荫昌. 冶金热力学及动力学. 沈阳: 东北工学院出 版社,1982) [10] Qin M S. Non-Blast Furnace Ironmaking. Beijing: Metallurgical Industry Press,1988 ( 秦民生. 非高炉炼铁. 北京: 冶金工业出版社,1988) [11] Zhou J C. Study on Dephosphorization Technology for High Phos￾phorus Oolitic Hematite by Coal Based Direct Reduction[Disserta￾tion]. Wuhan: Wuhan University of Science and Technology, 2007 ( 周继程. 高磷鲕状赤铁矿煤基直接还原法提铁脱磷技术研 究[学位论文]. 武汉: 武汉科技大学,2007) [12] Li T Q,Wang C Y,Liu X J. Similarities and differences of car￾bonaceous mesophases derived from homogenous and heterogene￾ous systems. Carbon Tech,2008,27( 5) : 5 ( 李同起,王成扬,刘秀军. 均相成核和非均相成核碳质中间 相的异同,碳素技术,2008,27( 5) : 5) [13] Liu J H,Zhang J Y,Zhou T P. Assessment of apparent activa￾tion energies for reducing iron oxides by CO and H2 . J Iron Steel Res,2000,12( 1) : 5 ( 刘建华,张家芸,周土平. CO 及 CO--H2 气体还原铁氧化物 反应表观活化能的评估. 钢铁研究学报,2000,12( 1) : 5) [14] Chun T J. Study on Process and Mechanism of Effective Beneficia￾tion of Superfine Low Grade Hematite [Dissertation]. Changsha: Central South University,2010 ( 春铁军. 低品位微细粒赤铁矿高效富集技术及机理研究 [学位论文]. 长沙: 中南大学,2010) ·1330·
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