复合镁盐对脱硫建筑石膏性能的影响

doi:10.19964/j.issn.1006-4990.2024-0440

Abstract

Abstract:

Desulfurized building gypsum is a type of building gypsum made from by-products mainly composed of calcium sulfate dihydrate（CaSO₄·2H₂O） produced during the wet removal of sulfur dioxide from flue gas using lime，calcium hydroxide，or limestone.Desulfurization building gypsum is made into building gypsum through calcination，but its insufficient mechanical properties seriously limits industrial application.Therefore，improving its strength is the focus of current research.The building gypsum was obtained by calcining desulfurization gypsum at 170 °C for 2 h using a certain proportion of magnesium acetate and magnesium sulfate composite magnesium salt as crystal modifier，and the effects of the proportion and dosage of composite magnesium salt on the properties of building gypsum were studied using X-ray diffractometer and scanning electron microscop.The results showed that using the compound magnesium salt of magnesium acetate and magnesium sulfate as crystal modifier，the Mg²⁺ in magnesium sulfate could promote crystal growth，corresponding to the best mechanical properties.The appropriate amount of SO₄^2- accelerated the hydration reaction by increasing the supersaturation of the dihydrate gypsum solution，ultimately improving the performance of building gypsum.The introduction of magnesium acetate not only ensured that the Mg²⁺ concentration was controllable，but also the acetate group could form a surface complex with Ca²⁺ to achieve precise control of crystal growth.The optimal process parameters were optimized in the experiment.When the dosage was 0.30% and the mass ratio of magnesium acetate to magnesium sulfate was 1∶2，the hydration product of the building gypsum prepared under this condition showed short and thick hexagonal crystals，and the mechanical properties of building gypsum were the best，with 2 h flexural and compressive strengths of 3.90 and 9.82 MPa，respectively，and absolute dry flexural and compressive strengths of 7.40 and 22.50 MPa，respectively.It met grade 3.0 building gypsum standard in GB/T 9776—2022 "Calcined Gypsum"，and close to grade 4.0 level..

Key words: desulfurization building gypsum, compound magnesium salt, building gypsum, mechanical properties

CLC Number:

TQ177.377

TIAN Bo, HAO Jianying, WANG Shengchang. Effect of compound magnesium salt on performance of desulfurized building gypsum[J]. Inorganic Chemicals Industry, 2025, 57(8): 87-93.

Figures/Tables 9

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Fig.1

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Table 4

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Fig.5

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样品	m（乙酸镁）∶m（硫酸镁）	掺量/%
G0	0	0
G1	1∶3	0.30
G2	1∶2	0.30
G3	1∶1	0.30
G4	2∶1	0.30
G5	3∶1	0.30
G6	1∶2	0.15
G7	1∶2	0.45

试样	a/nm	b/nm	c/nm	α、γ/ （°）	β/ （°）
半水石膏（PDF#41-0224）	12.028 0	6.932 0	12.691 0	90	90.183
G0	11.972 1	6.973 7	12.555 6	90	90.150
G1	11.983 2	6.932 2	12.662 7	90	90.180
G2	11.989 5	6.923 6	12.634 8	90	90.250
G3	11.994 5	6.916 6	12.646 3	90	90.050
G4	11.994 6	6.921 4	12.638 5	90	90.200
G5	11.983 8	6.921 9	12.645 0	90	90.090

样品	晶面（400）			晶面（204）
样品	2θ/（°）	FWHM	高度/nm	2θ/（°）	FWHM	高度/nm
G0	29.580	0.204	364	31.935	0.217	449
G1	29.720	0.213	380	31.940	0.248	470
G2	29.782	0.220	412	31.960	0.219	512
G3	29.783	0.202	374	31.980	0.224	469
G4	29.786	0.182	370	31.990	0.229	466
G5	29.791	0.208	368	32.040	0.226	460

National Inorganic Salts Information Center

Inorganic Acid-Base-Salt Committee of CIESC

Effect of compound magnesium salt on performance of desulfurized building gypsum

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