|
|
Microstructure of a Variety of Cokes After Alkali Enrichment |
QI Cheng-lin1,ZHANG Jian-liang1,LIU Hong-quan2,KONG De-wen1,WANG Xiao-liu1 |
1. State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing100083, China 2. Sinosteel Furnace Charge Co. , Ltd. , Beijing 100080, China |
|
|
Abstract It is difficult to distinguish tamping coke and top charging coke by conventional testing methods, such as cold strength, abrasion resistance, reactivity and strength after reaction. Some of tamping coke��s properties were even better than those of top charging coke, but from practical using effects of blast furnace, tamping coke was not as good as top charging coke. The reaction conditions were featured as high temperature, high alkali condition, intense reaction atmosphere and short time. Distribution of porosity in profile, microstructure and slag forming property of ash were analyzed and following conclusions were obtained. After alkali-rich reaction, there were obvious differences between top charging coke and tamping coke in microstructure. The porosity��s unevenness of tamping coke was greater than those of top charging coke, and tamping coke was with less and big pores in out space and inner part was dense with more throughout pores. After phase diagram and microstructure analysis, it could be obtained that ash forming characteristics of top charging coke were better than those of tamping coke, and top charging coke��s pores were blocked more seriously than those of tamping coke. From analysis of tuyere samples, it could be found that calcium content of ash in coke��s pores was small and it should belong to coke��s inherent ash; kalium (wK=28%) was unusually high in coke, so the situation of high alkali was close to real blast furnace reaction condition.
|
Received: 19 April 2012
Published: 16 July 2013
|
Corresponding Authors:
Chenglin Qi
E-mail: qichenglin@ustb.edu.cn
|
|
|
|
[1] |
WANG Jie,WANG Wei,XU Run- sheng,DAI Bo- wen,YU Yue,XUE Zheng- liang. Catalysis behavior of zinc on gasification reaction of top charged coke and stamp charged coke[J]. Chinese Journal of Iron and Steel, 2017, 29(9): 732-738. |
[2] |
ZHAO Hai-quan,,QI Yuan-hong,SHI Yong-lin. Analysis of physical and chemical characteristics of stainless steel dust[J]. Chinese Journal of Iron and Steel, 2017, 29(2): 105-110. |
[3] |
WU Keng��SHE Yuan����LIU Qi-hang��ZHAN Wen-long. Consideration on properties of coke and coke deterioration after large-scale blast furnace[J]. Chinese Journal of Iron and Steel, 2017, 52(10): 1-12. |
[4] |
ZHANG Dong-hai,WANG Wei,LI Xiang-wei,ZHU Hang-yu,XUE Zheng-liang. Carbon deposition behavior of reduction of sinter by carbon monoxide[J]. Chinese Journal of Iron and Steel, 2016, 28(8): 8-12. |
[5] |
LI Hong-wei. Practice of reducing pressure drop for No.1 BF in Shougang Jingtang Iron and Steel Co.�� Ltd.[J]. Chinese Journal of Iron and Steel, 2016, 51(7): 15-21. |
[6] |
SHI Hao,HUANG Jie,SONG Li- rong. Thermal gravimetric analysis of effect of iron on coke solution loss reaction[J]. Chinese Journal of Iron and Steel, 2016, 28(3): 35-39. |
|
|
|
|