磷石膏复合胶凝材料力学性能与微观特性研究

doi:10.19964/j.issn.1006-4990.2024-0413

Abstract

Abstract:

The large stockpiles of phosphogypsum，which contain a large amount of sulfate，phosphorus，fluorine，heavy metals and other harmful substances，pose environmental risks if improperly managed.To address this issue，the CaSO₄·2H₂O content in phosphogypsum was leveraged，combined with slag，Ca（OH）₂，and Na₂SO₄，to prepare phosphogypsum composite cementitious materials. their mechanical properties，hydration mechanism，microstructure，and leaching toxicity were investigated.The results showed that the compressive strength of the phosphogypsum composite cementitious material was initially decreased then increased with the addition of Ca（OH）₂ and initially increased then decreased with the addition of phosphogypsum.The optimal mix ratio was 67% slag，30% phosphogypsum，3% Ca（OH）₂ and 3% Na₂SO₄，and the compressive strength of 3 d，7 d and 28 d could reach 4.12，25.21 and 37.45 MPa，respectively.Increasing the Ca（OH）₂ content accelerated the decomposition of phosphogypsum into SO₄²⁻ and Ca²⁺，which in turn promoted the breakdown of silicon-oxygen and aluminum⁃oxygen tetrahedra in the slag.These components then hydrated to form large amounts of ettringite and C-（A）-S-H gel，which interweaved to form a dense network structure.The concentrations of F^- and PO₄^3- in phosphogypsum leachate were 148.23 and 298.24 mg/L，respectively，while in the cementitious material，they were decreased to 2.34~4.32 mg/L and 0.05~0.18 mg/L，respectively.Additionally，all pollutants in the cementitious material met the GB 8978—1996 Integrated Wastewater Discharge Standard.

Key words: phosphogypsum, cementitious materials, mechanical properties, hydration mechanism, leaching toxicity

CLC Number:

X705

WANG Feng, SONG Yu, HE Zhaoyi, XIA Yuhua, BI Yanli, FENG Hao, CAO Dongwei. Study on mechanical properties and microscopic characterization of phosphogypsum composite cementitious materials[J]. Inorganic Chemicals Industry, 2025, 57(5): 93-99.

Figures/Tables 8

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成分	w（SiO₂）	w（SO₃）	w（CaO）	w（Fe₂O₃）	w（Al₂O₃）	w（Na₂O）	w（MgO）	w（P₂O₅）	w（其他）
磷石膏	4.87	39.02	52.20	1.25	0.88	0.26	0.17	0.86	0.49
矿渣	28.22	2.45	50.82	0.38	13.52	0.18	0.62	—	3.81

序号	w［Ca（OH）₂］/ %	w（硫酸钠）/%	w（磷石膏）/%	w（矿渣粉）/%	水胶比	胶砂比
A1	1	3	10	89	0.5	0.33
A2	2	3	10	88	0.5	0.33
A3	3	3	10	87	0.5	0.33
A4	1	3	30	69	0.5	0.33
A5	2	3	30	68	0.5	0.33
A6	3	3	30	67	0.5	0.33
A7	1	3	50	49	0.5	0.33
A8	2	3	50	48	0.5	0.33
A9	3	3	50	47	0.5	0.33

组别	浸出质量浓度/（mg·L^-1）
组别	F^-	PO₄^3-	Hg²⁺	Pb²⁺	Cd²⁺	Cu²⁺
原始磷石膏	148.23	298.24	0.015 00	0.013 0	0.006 0	0.586
A7	4.32	0.18	0.000 15	0.004 5	0.001 0	0.025
A8	3.12	0.06	0.000 08	0.004 1	0.001 1	0.024
A9	2.34	0.05	0.000 08	0.001 2	0.001 2	0.022
GB 8978—1996限值	10	0.5	0.05	1.0	0.1	0.5

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Study on mechanical properties and microscopic characterization of phosphogypsum composite cementitious materials

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