铁化合物对煤热解行为及合成焦冶金性能的影响

IF 3.1 2区 材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING Journal of Iron and Steel Research(International) Pub Date : 2017-12-01 DOI:10.1016/S1006-706X(18)30014-1
Shu-xing Qiu, Sheng-fu Zhang, Qing-yun Zhang, Gui-bao Qiu, Liang-ying Wen
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引用次数: 13

摘要

高活性高强焦炭的利用可以通过促进氧化铁的间接还原来提高高炉的效率。铁化合物作为含铁矿物的主要成分,在制备高活性铁焦方面引起了广泛的关注。然而,铁化合物对煤的热解行为和焦炭的冶金性能的影响尚不清楚。因此,采用Fe3O4、Fe2O3和FeC2O4·2H2O三种铁化合物,研究了它们对煤热解行为和焦炭冶金性能的影响。热重曲线和差热重曲线表明,铁化合物对混合煤的热行为有轻微的影响。不同铁化合物的表观活化能不同,从94。85到110。一次热解过程所需表观活化能为11 kJ/mol,二次热解过程所需表观活化能较低。铁化合物对焦炭的力学性能和碳结构有不利影响。焦炭的反应活性、反应后的焦炭强度与焦炭中金属铁的含量或结晶堆积高度之间存在较强的相关性,反映了焦炭的热性能与金属铁含量和碳结构的相关性。
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Effects of iron compounds on pyrolysis behavior of coals and metallurgical properties of resultant cokes

The utilization of highly reactive and high-strength coke can enhance the efficiency of blast furnace by promoting indirect reduction of iron oxides. Iron compounds, as the main constituent in iron-bearing minerals, have aroused wide interest in preparation of highly reactive iron coke. However, the effects of iron compounds on pyrolysis behavior of coal and metallurgical properties of resultant cokes are still unclear. Thus, three iron compounds, i. e., Fe3O4, Fe2O3 and FeC2O4 · 2H2O, were adopted to investigate their effects on coal pyrolysis behavior and metallurgical properties of the resultant cokes. The results show that iron compounds have slight effects on the thermal behavior of coal blend originated from thermogravimetric and differential thermogravimetric curves. The apparent activation energy varies with different iron compounds ranging from 94. 85 to 110. 11 kJ/mol in the primary pyrolysis process, while lower apparent activation energy is required for the secondary pyrolysis process. Iron compounds have an adverse influence on the mechanical properties and carbon structure of cokes. Strong correlations exist among coke reactivity, coke strength after reaction, and the content of metallic iron in cokes or the values of crystallite stacking height, which reflect the dependency of thermal property on metallic iron content and carbon structure of cokes.

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来源期刊
CiteScore
4.30
自引率
0.00%
发文量
2879
审稿时长
3.0 months
期刊最新文献
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