Microstructure Variation of Pellets Containing Ferrous Dust during Carbonation Consolidation
查看参考文献16篇
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文摘
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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. |
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来源
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Journal of Iron and Steel Research
, International,2015,22(2):128-134 【核心库】
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DOI
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10.1016/s1006-706x(15)60020-6
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关键词
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ferrous dust
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microstructure
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CaO conversion rate
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carbonated pellet
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green pellet
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地址
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1.
College of Material and Metallurgy, Northeastern University, Hebei Key Laboratory of Modern Metallurgy Technology, Liaoning, Shenyang, 110004
2.
Hebei United University, Hebei Key Laboratory of Modern Metallurgy Technology, Hebei, Tangshan, 063009
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语种
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英文 |
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文献类型
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研究性论文 |
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ISSN
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1006-706X |
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学科
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冶金工业 |
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基金
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国家自然科学基金
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河北省自然科学基金
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文献收藏号
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CSCD:5370021
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