Influence of crystal-transforming agent on the performance and mechanism ofα-high-strength gypsum prepared from FGD gypsum  

作　　者：Zhuoyue Xu Xiao Wang Biao Jin Dawang Zhang Hui Li 

机构地区：[1]College of Materials Science and Engineering,Xi'an University of Architecture and Technology,Xi'an,710055,China [2]Schoolof Materials and Chemical Engineering,Henan University of Urban Construction,Pingdingshan,46736,China

出　　处：《Particuology》2024年第4期37-45,共9页颗粒学报（英文版）

摘　　要：This paper investigates the impact of flue gas desulfurization(FGD)gypsum's crystal modifier on the characteristics and microcosmic mechanism ofα-high strength gypsum.The results demonstrate that all three crystal modifiers can convert FGD gypsum toα-high-strength gypsum.Citric acid(CA)has the most significant influence onα-high-strength gypsum,and the preparedα-high-strength gypsum is short columnar,with an aspect ratio in the range of 1-3,and has a faster setting time,a larger specific surface area,and a smaller standard consistency,higher compressive strength,greater surface hardness,and smaller crystal particle size.The initial setting time of theα-high-strength gypsum manufactured with CA crystal modifier was decreased by 36%compared to the blank sample,the final setting time was lowered by 37.5%,and the water consumption of the standard consistency was reduced by 8%.The maximum strength is 32 MPa after 2 h,the absolute dry compressive strength is up to 38 MPa,and the surface hardness is improved by 24.43%.

关 键 词：Flue gas desulfurization gypsum Crystal modifier Microscopic mechanism α-high-strength gypsum 

分 类 号：TQ177[化学工程—硅酸盐工业]