Synthesis of High-Performance Cement Materials Using CaSO4 Prepared from Phosphogypsum

doi:10.16552/j.cnki.issn1001-1625.2026.0196

Abstract

Abstract:

To improve the resource utilization rate of phosphogypsum （PG）， in this study， anhydrous gypsum （AH） prepared by the PG crystallization method， hemihydrate gypsum （HPG） prepared by calcining PG， calcium sulfoaluminate （CAS）， and calcium oxide （CaO） were used to develop a sustainable， fast-setting， high-strength cementitious material （AHCSO） based on PG. The results indicate that the optimal formulation for the cementitious material—comprising 70% （mass fraction， the same below） AH， 20% HPG， 0.3% polycarboxylic acid superplasticizer （PCE）， 7% CAS， and 3% CaO—exhibits excellent rapid-setting properties， with an initial setting time of 0.3 h and a final setting time of 0.5 h. This cementitious material achieves a compressive strength of 20.8 MPa after 1 d （29.0 MPa when completely dry）， 35.0 MPa after 3 d （38.1 MPa when completely dry）， and 39.8 MPa after 28 d （45.7 MPa when completely dry）， softening coefficient of 0.89 and a PG utilization rate as high as 90% （AH 70%， HPG 20%）. Ultimately， the hydration rate， setting time， and pore structure of this cementitious material are synergistically controlled， leading to the successful preparation of AHCSO with rapid-setting and high-strength properties.

Key words: phosphogypsum, anhydrous gypsum, high blend ratio, quick setting, early strength, efficient resource utilization

CLC Number:

TQ177.3⁺8

CHEN Yiheng, FANG Keneng, CHEN Qianlin. Synthesis of High-Performance Cement Materials Using CaSO₄ Prepared from Phosphogypsum[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2026, 45(9): 3187-3201.

Figures/Tables 17

Table 1 Chemical composition analysis of raw materials

Material	Mass fraction/%
Material	SO₃	CaO	SiO₂	P₂O₅	Al₂O₃	MgO	Fe₂O₃	Na₂O	K₂O	Other
AH	59.679	36.395	2.811	0.275	0.195	0.075	0.070	0.129	0.031	0.340
PG	53.480	39.067	4.788	1.281	0.480	0.080	0.190	0.075	0.069	0.490

Fig.1 XRD patterns of raw materials

Fig.2 SEM images of raw materials

Table 2 Mix proportion of AH based cementitious material

Serial number	Sample name	Mass fraction/%					Standard consistency water demand/%
Serial number	Sample name	AH	HPG	CAS	CaO	PCE	Standard consistency water demand/%
1	A1（control group）	100					0.587
2	A2	95	5				0.607
3	A3	90	10				0.615
4	A4	85	15				0.628
5	A5	80	20				0.633
6	A6	75	25				0.650
7	B1	70	20	10			0.650
8	B2	70	20	7	3		0.747
9	B3	70	20	5	5		0.750
10	B4	70	20	3	7		0.753
11	B5	70	20		10		0.767
12	D1	70	20	7	3	0.1	0.313
13	D2	70	20	7	3	0.2	0.260
14	D3	70	20	7	3	0.3	0.243
15	D4	70	20	7	3	0.4	0.233
16	D5	70	20	7	3	0.5	0.227

Fig.3 Setting time of cementitious materials under different excitation conditions

Fig.4 Standard consistency of cementitious materials under different excitation conditions

Fig.5 Absolute dry compressive strength of gypsum cementitious material under different excitation conditions

Fig.6 Standard curing compressive strength of gypsum cementitious materials under different excitation conditions

Fig.7 Water resistance of gypsum-based cementitious materials under different curing conditions

Fig.8 Hydration rate of gypsum cementitious materials under different activation conditions

Fig.9 XRD patterns of gypsum cementitious materials under different excitation conditionsk

Fig.10 SEM images of gypsum cementitious material cured for 3 d under different excitation conditions

Fig.11 EDS spectrum of AFt

Fig.12 SEM images of gypsum cementitious material cured for 28 d under different excitation conditions

Fig.13 TG-DTG curves of gypsum cementitious material under different excitation conditions

Fig.14 Pore size analysis of gypsum cementitious material under different excitation conditions

Fig.15 Hydration structure control mechanism of gypsum cementitious material

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Synthesis of High-Performance Cement Materials Using CaSO₄ Prepared from Phosphogypsum

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