文献类型：期刊文献

英文题名：Understanding the influence of iron on fluidity and crystallization characteristics of synthetic coal slags

作者：Wang, Jiajian[1];Guo, Qinghua[1];Wei, Juntao[1];Liu, Xia[1];Wang, Xingjun[1];Yu, Guangsuo[1,2]

机构：[1]East China Univ Sci & Technol, Inst Clean Coal Technol, Shanghai 200237, Peoples R China;[2]Ningxia Univ, State Key Lab High Efficiency Coal Utilizat & Gre, Yinchuan 750021, Ningxia, Peoples R China

年份：2020

卷号：209

外文期刊名：FUEL PROCESSING TECHNOLOGY

收录：;EI(收录号：20203108996633);WOS:【SCI-EXPANDED(收录号:WOS:000567732800008)】；

基金：This work was supported by National Key Research and Development Program of China (2017YFB0602601) and National Natural Science Foundation of China (21878093).

语种：英文

外文关键词：Iron; Slagging; Fluidity; Fusibility; Gasification; Interfacial crystallization

摘要：Iron was an important component in coal ash slag and had a significant influence on the gasification reactivity and slag discharge in industrial gasification process. In this study, five synthetic slags with different iron contents (Fe2O3 ratios: 0%, 5%, 10%, 15%, 20%) were prepared to investigate the effect of iron on fluidity and crystallization characteristics of synthetic slag. The results showed that the fusion temperatures of synthetic slags decreased with the increase of iron content, which was mainly resulted from the neutralization between iron and high-melting-temperature lime and the formation of lower-melting-temperature srebrodolskite during fusion process of synthetic slag. At high temperatures, slag viscosity decreased with the increase of iron content. But as the temperature further decreased, the viscosity changes of coal ash diverged without following the simple monotonous trend. Viscosity transformation after crystallization was affected by multi-factors such as interfacial crystallization, temperature and atmosphere. The sudden viscosity changes of synthetic slags showed close relationship with the formation of gehlenite and anorthite, which was mainly owing to the position replacement and polymerization degree decrease of Al3+, Si2+ and Ca2+ in melt network by iron as an amphoteric substance.