改性磷石膏作为水泥缓凝剂的应用研究

doi:10.19964/j.issn.1006-4990.2025-0164

Abstract

Abstract:

Phosphogypsum，as a by-product of the wet-process phosphoric acid industry，is limited in its application as a cement retarder due to the presence of soluble phosphorus and fluorine impurities.To address this issue，a modification method for stockpiled phosphogypsum based on an in-situ leaching process was proposed.Ca（OH）₂ and CaCO₃ solutions were used to carry out harmless treatment of phosphogypsum，and the modified phosphogypsum was then used to prepare cement.The physical properties of the hydrated cement samples were measured to systematically evaluate the impact of the modified phosphogypsum on cement performance.The experimental results showed that the soluble phosphorus and fluorine contents in phosphogypsum treated with Ca（OH）₂ were reduced to 0.03% and 0.08% respectively，meeting the first-grade index standards of "Phosphogypsum"（GB/T 23456—2018） and making it suitable for use in gypsum building materials.When it was used as a retarder and added to P·O42.5 cement，the standard consistency water requirement of the cement was reduced to 26.4%，the initial and final setting time were shortened to 314 min and 365 min respectively，and the 28 d compressive strength reached 50.2 MPa，meeting the requirements of "General Portland Cement"（GB 175—2023）.The compounding experiments showed that when the dosage of modified phosphogypsum was 5%，the comprehensive performance of the cement could meet the standard requirements，and the substitution rate of natural gypsum could be increased to 83%.This study verified the feasibility of the in-situ leaching process in the harmless treatment and resource utilization of phosphogypsum，providing technical support for alleviating the pressure of phosphogypsum stockpiling and promoting green production in the cement industry.

Key words: phosphogypsum, in-situ leaching, harmless treatment, cement retarder, compressive strength, setting time

CLC Number:

TQ126.31

CHEN Zixiang, ZHANG Qutian, ZHANG Xia, ZHANG Long, YANG Xinyi, YU Junxia, LUO Huihua, CHI Ru′an, ZHOU Fang. Study on application of modified phosphogypsum as cement retarder[J]. Inorganic Chemicals Industry, 2026, 58(3): 78-84.

Figures/Tables 8

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References 22

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样品	w（CaO）	w（SiO₂）	w（Al₂O₃）	w（SO₃）	w（Fe₂O₃）	w（MgO）
天然二水石膏	25.04	6.35	1.29	46.08	1.06	1.55
水泥熟料	61.49	22.33	5.26	0.48	3.46	3.89
石灰石	50.36	5.40	1.39	0.15	0.31	2.08
高炉矿渣	34.01	34.50	17.71	1.64	1.03	6.01

样品	w（可溶性磷）/%	w（可溶性氟）/%	w（总磷）/%	w（总氟）/%	编号
磷石膏原样	0.97	0.84	1.17	1.45	M1
CaCO₃（中）	0.29	0.16	0.97	1.13	M2
Ca（OH）₂（中）	0.16	0.11	1.12	1.26	M3
CaCO₃（上）	0.13	0.09	0.95	1.09	M4
Ca（OH）₂（上）	0.03	0.08	0.59	0.93	M5

编号	磷石膏种类	w（熟料）/%	w（磷石膏）/%	w（天然二水石膏）/%	w（石灰石）/%	w（高炉矿渣）/%
M5-1	M5	84	5	1	4	6
M5-2	M5	84	4	2	4	6
M5-3	M5	84	3	3	4	6
M5-4	M5	84	2	4	4	6
M5-5	M5	84	1	5	4	6

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Inorganic Acid-Base-Salt Committee of CIESC

Study on application of modified phosphogypsum as cement retarder

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