Microstructure Variation of Pellets Containing Ferrous Dust during Carbonation Consolidation

IMR OpenIR

	Microstructure Variation of Pellets Containing Ferrous Dust during Carbonation Consolidation
其他题名	Microstructure Variation of Pellets Containing Ferrous Dust during Carbonation Consolidation
	Shi Yan 1; Liu Shimeng 2; Hu Changqing 2; Zhang Yuzhu 2
	2015
发表期刊	JOURNAL OF IRON AND STEEL RESEARCH INTERNATIONAL
ISSN	1006-706X
卷号	22 期号:2 页码:128-134
摘要	The carbonation and microstructure characteristics of pellets containing ferrous dusts were investigated during carbonation consolidation at different reaction temperatures and CO2 partial pressures. The results indicated that green pellets had loose and network supporting structure with initial strength. and large cracks and pores existed in the pellets. The carbonation reaction was controlled by interfacial chemical reaction at the initial fast stage, which limited diffusion and thus caused the reaction rate to decrease. With increasing reaction temperature and CO2 partial pressure, the conversion rates of CaO and the number of microcrystalline CaCO3 particles increased, and the volume expansion of CaC2O3 led to a decrease in the open porosity. average pore size and specific surface area of the pellets. Micro-pores were occluded, and the number of smaller pores (diameter less than 50 nm) increased, thereby resulting in the more compact and uniform structure of carbonated pellets. Simultaneously, the dense structure prevented CO2 diffusion into the product layer. affecting the increase in carbonation conversion rate.
其他摘要	The carbonation and microstructure characteristics of pellets containing ferrous dusts were investigated during carbonation consolidation at different reaction temperatures and CO_2 partial pressures. The results indicated that green pellets had loose and network supporting structure with initial strength, and large cracks and pores existed in the pellets. The carbonation reaction was controlled by interfacial chemical reaction at the initial fast stage, which limited diffusion and thus caused the reaction rate to decrease. With increasing reaction temperature and CO_2 partial pressure, the conversion rates of CaO and the number of microcrystalline CaCO_3 particles increased, and the volume expansion of CaCO_3 led to a decrease in the open porosity, average pore size and specific surface area of the pellets. Micro-pores were occluded, and the number of smaller pores (diameter less than 50 nm) increased, thereby resulting in the more compact and uniform structure of carbonated pellets. Simultaneously, the dense structure prevented CO_2 diffusion into the product layer, affecting the increase in carbonation conversion rate.
关键词	BASIC OXYGEN STEEL IRON-OXIDE PELLETS HIGH-TEMPERATURE FLUXED PELLETS CO2 SLUDGE SLAG ferrous dust microstructure CaO conversion rate carbonated pellet green pellet
收录类别	CSCD
语种	英语
资助项目	[National Natural Science Foundation of China] ; [Natural Science Foundation of Hebei Province of China]
CSCD记录号	CSCD:5370021
引用统计	被引频次：1[CSCD] [CSCD记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/150026
专题	中国科学院金属研究所
作者单位	1.中国科学院金属研究所 2.Hebei United University, Hebei Key Lab Modern Met Technol, Tangshan 063009, Hebei, Peoples R China
推荐引用方式 GB/T 7714	Shi Yan,Liu Shimeng,Hu Changqing,et al. Microstructure Variation of Pellets Containing Ferrous Dust during Carbonation Consolidation[J]. JOURNAL OF IRON AND STEEL RESEARCH INTERNATIONAL,2015,22(2):128-134.
APA	Shi Yan,Liu Shimeng,Hu Changqing,&Zhang Yuzhu.(2015).Microstructure Variation of Pellets Containing Ferrous Dust during Carbonation Consolidation.JOURNAL OF IRON AND STEEL RESEARCH INTERNATIONAL,22(2),128-134.
MLA	Shi Yan,et al."Microstructure Variation of Pellets Containing Ferrous Dust during Carbonation Consolidation".JOURNAL OF IRON AND STEEL RESEARCH INTERNATIONAL 22.2(2015):128-134.