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Effects of succinic acid on crystallite morphology and mechanical strength of α-hemihydrate desulfurized gypsum synthesized by hydrothermal method
Received date: 2020-10-16
Online published: 2021-04-23
In order to improve untilization rate and additional value of desulfurized gypsum,high strength α-hemihydrate desulfurization gypsum material was prepared by hydrothermal synthesis method in 15%（mass fraction） NaCl solution at 95 ℃. The effects of succinic acid content on crystal transformation behavior,phase composition,crystallite morphology and mechanical strength of the α-hemihydrate desulfurized gypsum were studied.The results showed that the induction nucleation and crystal growth times of the α-hemihydrate desulfurized gypsum increased gradually with the increase of mixing amount of succinic acid and the crystal transformation time was prolonged.At the same time,the length-diameter ratio of the α-hemihydrate desulfurized gypsum decreased with increase of succinic acid,which was benefit to promote hydration of α-hemihydrate desulfurized gypsum and improve compactness to enhance mechanical properties of the materials.Among,the length-diameter ratio of α-hemihydrate desulfurized gypsum reduced to 1∶1 with succinic acid of 0.20%（mass fraction） which enhanced the 2 h flexural strength and drying compressive strength of the materials to 5.54 MPa and 38.47 MPa,respectively.
Cheng Hu , Weiheng Xiang , Ping Chen , Yang Ming . Effects of succinic acid on crystallite morphology and mechanical strength of α-hemihydrate desulfurized gypsum synthesized by hydrothermal method[J]. Inorganic Chemicals Industry, 2021 , 53(4) : 76 -80 . DOI: 10.11962/1006-4990.2020-0319
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