|
|
Effects of Microwave Heating on Pore Fractal Properties of Blast Furnace Sludge |
GAO Zhi-fang1,LI Liao-sha1,WU Zhao-jin1,SHEN Xing-mei1,Lv�g Hui-hong1,SU Shi-huai2 |
1. Anhui Provincial Key Laboratory of Metallurgy Engineering and Resources Recycling, Anhui University of Technology,Ma��anshan 243002, Anhui, China 2. Maanshan Iron and Steel Co��, Ltd��, Ma��anshan 243002, Anhui, China |
|
|
Abstract Effects of microwave heating on the pore fractal properties of blast furnace sludge (BFS) and relative mechanism were studied. The results show that the morphology features of iron bearing sinter and coke particles, which are the main constituents of the BFS, were remarkably changed by microwave heating. The porosity, surface roughness and specific surface area of modified particle surface all increased obviously. Combining with fractal method called Sierpinski model, the fractal dimensions of sinter, coke and others increased from 2��35, 2��24 and 2��58 to 2��65, 2��44 and 2��61 respectively, after modification by microwave heating. The results predicted that the reaction mechanism of microwave heating for BFS is related to two aspects. Different mineral phases existed in BFS particles incline to dissociate each other due to their different microwave absorbability;some recombination or reconstruction of matters or structure leads to structure defects, which have great influences on the surface morphology characteristics and chemical properties. The research indicated that fractal dimension can be used as an effective factor for quantitative analysis of the pore changes in morphology of the sludge. Furthermore, it is helpful for separation and extraction of valuable constituent from BFS.
|
Received: 09 May 2012
Published: 23 August 2013
|
|
|
|
[1] |
WANG Yi-ci,LI Hai-yang,LUO Guo-ping,LI Shuang-wei. Macrokinetics of gasification dephosphorization of converter slag by microwave carbon thermal reduction[J]. Chinese Journal of Iron and Steel, 2017, 29(2): 93-97. |
[2] |
WANG Yi- ci,LI Hai- yang,LI Shuang- wei,LUO Guo- ping. Thermodynamic analysis and experiment on gasification dephosphorization reaction of converter slag[J]. Chinese Journal of Iron and Steel, 2016, 28(6): 31-34. |
[3] |
CHEN Yan,BAI Chen- guang,YOSHIKAWA Noboru,TANIGUCHI Shoji. Numerical simulation on the heating of blast furnace (BF) slag with high TiO2 under microwave irradiation[J]. Chinese Journal of Iron and Steel, 2016, 28(2): 14-18. |
[4] |
HU Bing,,HUANG Zhu-cheng,WANG Zhao-cai,,SUN Ying,. Microscopic mechanism of oxidized pellets during coal-based direct reduction by microwave heating[J]. Chinese Journal of Iron and Steel, 2016, 28(10): 43-49. |
[5] |
GUO Luo-fang��WANG Shi-song��ZHANG Xiao-wei��LI Hong��WANG Yao. A new numerical simulation method of colliding-agglomerating growth of Al2O3 inclusions[J]. Chinese Journal of Iron and Steel, 2015, 33(2): 52-57. |
[6] |
WANG Jie-ping��XIE Quan-an��SUN Zhang��JI Bin��LIANG Ying-hua. Pore structure development of coke during carbon solution loss reaction[J]. Chinese Journal of Iron and Steel, 2015, 50(11): 8-13. |
|
|
|
|