为了研究在炼焦过程中配加铁矿粉对焦炭性能的影响，在气煤中配加0、5%和10%的铁矿粉炼制铁焦，采用I-型转鼓、差热分析仪、SEM、XRD和光学显微镜对铁焦的强度、反应性、微观结构、微晶结构和光学组织进行研究，并采用Coats-Redfern方法计算气化反应的动力学参数。结果表明，在气煤中配加铁矿粉可以有效提高铁焦的转鼓强度及反应性，随着铁矿粉配比的增加，铁焦的堆垛高度Lc值逐渐减小，石墨化程度降低，并且铁焦的气孔逐渐减小，且附着于气孔表面的铁原子密度增大，出现成片含铁区域，焦炭结构中各向同性结构和镶嵌结构减少，残炭结构增多。根据动力学分析可知，配加0、5%和10%的铁矿粉制得的铁焦，其活化能分别为228.4、235.5和256.7 kJ/mol，并且发现表观活化能与指前因子具有动力学补偿作用。
In order to clarify the effect of iron ore fines which were added during coking process on the coke properties, three different iron ore blend ratios (0,5%and 10%) were used to make iron-coke. I-type drum、thermogravimetric analy-ser、SEM、XRD and optical microscope were used to investigate the properties of iron-coke,such as strength,reactivi-ty,microstructure,crystallite structure and optical texture. Moreover,the method of Coats-Redfern was used to calcu-late the kinetics parameters of the gasification reaction. The results showed that it could increase the cold strength and re-activity of iron-coke by adding iron ore fines into gas coal. With the increase of iron ore blend ratio,the stacking height Lc value of iron-coke and the gphitization degree decreased. The pore size of iron-coke became smaller as well. The den-sity of Fe atom attaching to the surface of the pore increased,and a piece of iron region was found. The isotropic and mosaic structure in coke was reduced,while the residual carbon structure was increased. According to the kinetics analysis,the activation energy of iron-coke with 0,5% and 10% iron ore fines blend ratio was 228.4,235.5 and 256.7 kJ/mol,respectively. Meanwhile,it was found that the apparent activation energy and pre-exponential factor had a kinetic compensation effect.
参考文献
| [1] | Seiji NOMURA;Hidetoshi TERASHIMA;Eiji SATO.Some Fundamental Aspects of Highly Reactive Iron Coke Production[J].ISIJ International,20076(6):823-830. |
| [2] | Kenichi HIGUCHI;Seiji NOMURA;Kazuya KUNITOMO.Enhancement of Low-temperature Gasification and Reduction by Using Iron-coke in Laboratory Scale Tests[J].ISIJ International,20118(8):1308-1315. |
| [3] | Seiji NOMURA;Hisatsugu KITAGUCHI;Kouichi YAMAGUCHI.The Characteristics of Catalyst-coated Highly Reactive Coke[J].ISIJ International,20072(2):245-253. |
| [4] | Shungo NATSUI;Ryo SHIBASAKI;Tatsuya KON.Effect of High Reactivity Coke for Mixed Charge in Ore Layer on Reaction Behavior of Each Particle in Blast Furnace[J].ISIJ International,201310(10):1770-1778. |
| [5] | 张慧轩;毕学工;史世庄;吴琼;孙超祺;马毅瑞;程向明;李鹏.炼焦配煤中添加铁矿石对焦炭性能的影响[J].武汉科技大学学报（自然科学版）,2014(2):91-96. |
| [6] | 史世庄;孙超祺;毕学工;张慧轩;董晴雯;林志龙.铁矿粉配比对铁焦性能影响的试验研究[J].钢铁,2014(5):7-12. |
| [7] | 史世庄;董晴雯;毕学工;李鹏;罗永辉;汪恭二.炼焦工艺条件对铁焦性能影响的试验[J].钢铁,2015(4):8-12. |
| [8] | 李鹏;毕学工;史世庄;张慧轩;周进东.铁焦气化反应行为的实验室研究与分析[J].钢铁研究学报,2015(12):10-15. |
| [9] | 史世庄;鲁帅;毕学工;李鹏;毛彦高;郑齐.铁焦初始反应温度的降低及其机理[J].钢铁,2015(7):15-19,42. |
| [10] | 毕学工;马毅瑞;李鹏;张慧轩;程向明;史世庄.混装铁焦对人造富矿还原行为的影响[J].钢铁,2014(11):9-13,35. |
| [11] | 马毅瑞 .铁焦和铁矿石混合反应行为热力学与实验室研究[D].武汉科技大学,2014. |
| [12] | 张龙龙 .神府煤-Ⅲ制备的含铁型焦的物理化学基础研究[D].太原理工大学,2015. |
| [13] | 蔡湄夏;郭豪;张建良;张旭.铁氧化物对焦炭溶损反应的影响[J].钢铁研究学报,2009(7):8-12. |
| [14] | 左海滨;戎妍;张建良;吴小兵;高冰.氧化钙对焦炭性能的影响[J].钢铁,2014(1):7-12. |
| [15] | 吕青青;杜屏;周俊兰.高炉块状带焦炭劣化机理[J].钢铁,2016(1):13-18. |
| [16] | 蔡皓宇;陈辉;张勇;武建龙.入炉碱负荷与焦炭劣化的关系[J].中国冶金,2015(12):17-21,39. |
| [17] | 高冰;张建良;左海滨;孔德文;祁成林.2000m3高炉焦炭质量评价[J].钢铁,2014(2):9-14. |
| [18] | Ueki, Yasuaki;Nunome, Yoko;Yoshiie, Ryo;Naruse, Ichiro;Nishibata, Yuko;Aizawa, Sadayoshi.Effect of Woody Biomass Addition on Coke Properties[J].ISIJ International,201411(11):2454-2460. |
| [19] | 闫云飞;张磊;张力;雷强;张杰.氧气浓度对劣质煤掺混生活污泥燃烧特性的影响[J].燃料化学学报,2013(4):430-435. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%