丁二酸对水热合成α-半水脱硫石膏微晶形貌及力学强度的影响

doi:10.11962/1006-4990.2020-0319

Abstract

Abstract:

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.

Key words: hydrothermal synthesis method, succinic acid, α-hemihydrate desulfurized gypsum, length-diameter ratio, mechanical strength

CLC Number:

TQ177.373

Hu Cheng,Xiang Weiheng,Chen Ping,Ming Yang. 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.

Figures/Tables 7

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丁二酸掺量/%	诱导成核时间/h	晶体生长时间/h	总转化时间/h
0.00	0.25	0.75	1.0
0.01	0.25	0.75	1.0
0.05	0.25	0.75	1.0
0.10	0.25	1.25	1.5
0.15	0.50	1.50	2.0
0.20	0.50	2.50	3.0

National Inorganic Salts Information Center

Inorganic Acid-Base-Salt Committee of CIESC

Effects of succinic acid on crystallite morphology and mechanical strength of α-hemihydrate desulfurized gypsum synthesized by hydrothermal method

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