脱硫灰和赤泥对碱激发循环流化床灰体系调控的差异性分析
Analysis on differences in regulating alkali-activated circulating fluidized bed fly ash system by desulfurization ash and red mud
Circulating fluidized bed fly ash (CFB-FA),desulfurization ash (SDA),and red mud (RM) are used as siliceous-aluminous solid waste,sulfate solid waste,and alkaline solid waste,respectively,the differences in regulating alkali-activated CFB-FA system by SDA and RM are studied,mainly focusing on the impact on setting time and compressive strength.Study results show that the optimal Na/Al and Si/Al ratios for the alkali-activated CFB-FA system are 1.0 and 4.8,respectively,presenting an initial time of 80 min,a final setting time of 300 min,and a 28-day compressive strength of 17.4 MPa.Generally,SDA promotes the setting of the alkali-activated CFB-FA system,while RM retards it.Both SDA and RM accelerates the formation of type I C-S-H and aragonite,but the effect is more pronounced in SDA experiment.The appearance and disappearance of type I C-S-H and aragonite are closely related to the strength after doping with SDA or RM,which confirms the phenomenon of strength development in the early stage and strength reduction in the later stage.Tricalcium silicate is observed in both cases,but no sodium feldspar is found.With the increasing SDA dosage,the contents of tricalcium silicate and calcium carbonate decrease,while the content of C-S-H gel increases.With the increase of RM dosage,the contents of tricalcium silicate and calcium carbonate remain unchanged,but the content of C-S-H gel decreases.
循环流化床灰 / 调控 / 微观结构 / 碱激发材料 / 拜耳法赤泥 / 脱硫灰
circulating fluidized bed fly ash / regulation / microstructure / alkali-activated material / Bayer method red mud / desulfurization ash
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中央引导地方科技发展专项资金项目任务书(YDZX20191400002883)
山西省重点研发计划项目(201903D321073)
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