燃料化学学报（中英文）2024，Vol.52Issue(1)：1-8,8.DOI:10.19906/j.cnki.JFCT.2023050
钙铁助剂对粉煤灰熔融性和结晶行为的影响机理
Influence mechanism of Ca-Fe flux on fusibility and crystallization behavior of coal fly ash
摘要
Abstract
The preparation of high-strength inorganic fibers by coal fly ash is an important method to achieve its high-value utilization.Due to high content of SiO2 and Al2O3 in coal fly ash,it is necessary that Ca-Fe flux should be added to decrease melting temperature of coal fly ash during homogenization of slag and avoid crystallization behavior during preparation of fibers.In this paper,the influence mechanism of Ca-Fe flux on the fusibility and crystallization behavior of coal fly ash under air atmosphere was investigated.The results show that calcium oxide(CaO)and iron oxide(Fe2O3)does not show synergistic fluxing effect on fusibility of coal fly ash under air atmosphere,moreover,the fluxing effect of CaO on fusibility is more obvious than that of Fe2O3.At high temperature,Fe2O3 cannot react with silicon-aluminum components to form low melting point minerals,while CaO is beneficial to transform refractory mullite into anorthite,which greatly reduces the melting point of fly ash.However,excess CaO(＞30％)leads to formation of calcium feldspar,which increases melting point of fly ash obviously.During the cooling process,iron precipitates in the form of hematite while calcium precipitates in the form of anorthite,and the crystallization temperature of hematite is lower than that of anorthite.When content of CaO is 32.46％,the melting point of coal fly ash is the lowest,and there is no crystallization during the cooling process.Therefore,CaO is suitable to adjust fusibility and crystallization behavior of coal fly ash during preparation of inorganic fiber.关键词
粉煤灰/无机纤维/钙铁助剂/熔融性/结晶行为Key words
coal fly ash/inorganic fiber/Ca-Fe flux/ash fusion temperature/crystallization分类
化学化工引用本文复制引用
王冀,郭航昊,路广军,渠永平,马志斌..钙铁助剂对粉煤灰熔融性和结晶行为的影响机理[J].燃料化学学报（中英文）,2024,52(1):1-8,8.基金项目
The project was supported by the Shanxi Province Science Foundation for Youths(202203021212135),National Natural Science Foundation of China(22078181),Shanxi Province Key Research and Development Program(202102090301004,202102090301024 and 202102090301025)and Shanxi Province Graduate Innovation Project(2022Y131).山西省基础研究计划青年项目(202203021212135),国家自然科学基金(22078181),山西省重点研发计划(202102090301004,202102090301024,202102090301025),山西省研究生创新项目(2022Y131)资助 （202203021212135）
