超疏水磷石膏制品的制备及机理研究

doi:10.19964/j.issn.1006-4990.2024-0123

Abstract

Abstract:

In order to improve the water resistance of phosphogypsum products and the utilization rate of phosphogypsum，the effects of three activators（alcohol amine activator，calcium activator，and silicon aluminum activator） on the strength，water absorption rate，24 h water absorption rate，and softening coefficient of phosphogypsum products containing silicon oil were discussed in this paper.The water resistance of phosphogypsum products containing calcareous activator under different silicone oil content was further studied.Combined with contact angle and scanning electron microscope（SEM） test methods，the water resistance mechanism of calcium activator-silicon oil phosphogypsum products was revealed.The results showed that the strength of phosphogypsum products containing silicone oil was decreased gradually with the increase of the content of three activators.While the 24 h water absorption and softening coefficient showed different changing rules with the contents of three activators.Among them，phosphogypsum products containing silicone oil doped with 1% calcium activator had better strength，water absorption resistance and softening coefficient.When the content of calcium activator was 1% and the content of silicone oil was 0.10%，the water absorption rate of phosphogypsum was 3.38% for 24 h，13.97% for 14 d，and the softening coefficient was 0.86，showing superhydrophobicity.It was due to the chemical condensation reaction between calcium activator and silicone oil，which embedded/attached small synapses in the gypsum matrix，forming the “lotus leaf effect”.

Key words: phosphogypsum activator, water absorption rate, softening coefficient, microstructure

CLC Number:

TQ177.37

TANG Kaijing, LIU Chuanbei, LI Yingding, JIANG Yong, WU Junnan, ZHANG Tao. Research on preparation and mechanism of superhydrophobic phosphogypsum products[J]. Inorganic Chemicals Industry, 2025, 57(1): 97-102.

Figures/Tables 9

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w（SO₃）	w（CaO）	w（SiO₂）	w（P₂O₅）	w（Al₂O₃）	w（Fe₂O₃）
49.63	34.84	8.85	1.32	0.85	0.31
w（K₂O）	w（MgO）	w（SrO）	w（PbO）	w（TiO₂）
0.18	0.18	0.06	0.02	0.08

w（含氢硅油）/%	绝干强度/MPa	24 h饱水强度/MPa	24 h吸水率/%	7 d吸水率/%	14 d吸水率/%	软化系数
0.05	11.64	8.49	8.63	14.26	21.14	0.73
0.10	13.68	11.76	3.38	7.88	13.97	0.86
0.20	10.73	6.97	4.73	9.21	15.73	0.65
0.30	8.94	4.83	7.33	11.58	18.63	0.54

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Research on preparation and mechanism of superhydrophobic phosphogypsum products

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