混合相磷石膏基胶结材制备与早期性能研究

doi:10.19964/j.issn.1006-4990.2023-0421

Abstract

Abstract:

Mixed phase phosphogypsum was used as the main raw material，and slag，red mud，metakaolin and clinker were added to prepare mixed phase phosphogypsum-based cementing material.Its early performance was studied by compressive strength，pH and leaching toxicity tests，and the hydration mechanism was elaborated by X-ray diffraction（XRD），scanning electron microscope（SEM） and Fourier transform infrared spectroscopy（FT-IR） tests.The results showed that 53.76%（mass fraction，the same below） of mixed phase phosphogypsum，9.68% of slag，9.68% of red mud，16.13% of metakaolin and 10.75% of clinker could prepare the mixed phase phosphogypsum cementing material with optimized performance，and its compressive strength at the 3，5 d and 7 d were 8.93，10.99 MPa and 13.14 MPa respectively.Its pH alkalinity was lower than that of traditional cement-based materials，and the leaching concentration of PO₄^3- and F^- were lower than the limit of the integrated wastewater discharge standard.The results of microscopic analysis showed that phosphogypsum was calcined at 400 ℃ for 60 min to form hemihydrate-anhydrate mixed phase phosphogypsum，in which the relative contents of hemihydrate and anhydrate gypsum were 31.7% and 68.3% respectively.The hydrated calcium silicate gel，ettringite and brushite generated by hydration of mixed phase phosphogypsum-based cementing materials formed dense structures，which would improve the strength of materials and block the leaching of pollutants.The mixed phase phosphogypsum-based cementing material had good mechanical properties and environmental compatibility，which provided a new potential way for the large-scale consumption of phosphogypsum.

Key words: phosphogypsum, mixed phase, cementing material, leaching toxicity, micro structure

CLC Number:

TQ126.3

WANG Ruting, ZHAO Xiaorong, HUANG Xuquan, WANG Haojie, XUE Fei, CAI Jiawei. Research on preparation and early performance of mixed phase phosphogypsum-based cementing materials[J]. Inorganic Chemicals Industry, 2024, 56(3): 98-104.

Figures/Tables 11

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材料	w （CaO）	w（SiO₂）	w （Al₂O₃）	w （MgO）	w （SO₃）	w （Fe₂O₃）	w （K₂O）	w （Na₂O）
PG	28.81	8.56	0.96	0.21	39.72	0.67	0.67	0.32
CC	65.47	20.02	4.36	1.64	1.92	3.33	1.27	0.34
SL	38.65	29.94	15.94	7.98	3.74	1.18	0.62	0.34
RM	13.97	20.58	25.48	1.54	—	11.77	2.07	6.55
MK	0.14	49.92	42.72	0.09	0.03	0.40	0.13	0.15

实验号	因素			7 d抗压强度/MPa
实验号	A	B	C	7 d抗压强度/MPa
1	1	1	1	12.65
2	1	2	2	13.14
3	1	3	3	9.50
4	2	1	2	10.81
5	2	2	3	10.93
6	2	3	1	10.06
7	3	1	3	10.41
8	3	2	1	10.14
9	3	3	2	11.39
K₁	11.76	11.29	10.95
K₂	10.60	11.40	11.78
K₃	10.65	10.32	10.28
R	1.16	1.08	1.50

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Research on preparation and early performance of mixed phase phosphogypsum-based cementing materials

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