Preparation and application of gypsum whiskers from desulfurized building gypsum
Utilizing desulphurized building gypsum as a raw material,gypsum whisker can be prepared by hydrothermal method,which can realize the efficient utilization of desulphurized gypsum.This study investigates the impact of process conditions on the morphology of gypsum whiskers.The morphology and phase of the whisker are characterized by scanning electron microscopy and X-ray diffraction.Additionally,the study explores the preliminary influence of self-made gypsum whiskers on the mechanical properties of cement-based materials.The results indicate that the preparation of gypsum whiskers with desulfurized gypsum is simple without pretreatment of raw materials.Gypsum whiskers with excellent morphology and aspect ratio of about 100 can be prepared under the optimal process conditions of a 5%mass fraction of the solution,a reaction temperature of 140℃,a reaction time of 2.5 hours,a pH value of 5,and a 2%dosage of the crystallizer.The incorporation of 1.5%gypsum whiskers enhances the flexural and compressive strength of cement materials by 30.5%and 28.4%,respectively.
desulfurized building gypsumgypsum whiskerhydrothermal methodmechanical property
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