磷石膏基建筑石膏的制备及改性研究

doi:10.19964/j.issn.1006-4990.2023-0138

Abstract

Abstract:

Using phosphogypsum as raw material，the impurities in phosphogypsum were removed by water washing method，architectural gypsum was prepared by low-temperature calcination，and the effects of calcination temperature and calcination time on gypsum strength and three-phase component content were studied with the help of DSC-TG technology，and then the effects of additives such as sodium tripolyphosphate，fly ash reinforcing agent，melamine and polypropylene fiber of retarder were investigated on the physical and chemical properties of gypsum test block.The results showed that the mass fraction of β-CaSO₄·0.5H₂O prepared under the condition of low calcination at 170 ℃ and 3 h was 72.23%，and the mechanical properties of gypsum test block were better than those of grade 2.0 products in GB/T 9776—2008“Building Gypsum”The sodium tripolyphosphate with an added amount of 0.15%（mass fraction，the same below） was used as a retarder，and fly ash with an added amount of 5.00% was used as a reinforcing agent with an addition amount of 0.05% melamine was used as a water reducing agent and polypropylene fiber with an addition of 1.00% was modified to build gypsum powder，and the dry flexural strength and dry compressive strength of the prepared gypsum test block were 4.17 MPa and 12.97 MPa for 7 d.The role of various additives in the preparation of architectural gypsum powder using phosphogypsum as raw material was discussed，and the construction gypsum powder with good performance was prepared，which provided technical methods and theoretical basis for the comprehensive utilization of phosphogypsum.

Key words: phosphogypsum, gypsum hemihydrate, strength, construction plaster, low calcination

CLC Number:

TQ126.31

GUO Shuang, XING Dongxian, GUO Xiao, JI Xiaojie, TANG Jianwei, HUA Quanxian, WANG Baoming, LIU Yong. Study on preparation and modification of phosphogypsum-based architectural gypsum[J]. Inorganic Chemicals Industry, 2023, 55(12): 102-110.

Figures/Tables 16

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w（SO₃）	w（CaO）	w（SiO₂）	w（P₂O₅）	w（Al₂O₃）
48.71	35.10	13.13	1.13	0.81
w（Fe₂O₃）	w（MgO）	w（F）	w（Na₂O）	w（K₂O）
0.18	0.20	0.33	0.13	0.21

w（SO₃）	w（CaO）	w（SiO₂）	w（P₂O₅）	w（Al₂O₃）
50.66	36.60	10.18	0.85	0.614
w（Fe₂O₃）	w（MgO）	w（F）	w（Na₂O）	w（K₂O）
0.172	0.171	0.168	0.090 8	0.134

时间/h	w（附着水）/%	w（AIII）/%	w（HH）/%	w（DH）/%
1	0.07	0.00	46.12	41.74
2	0.00	0.06	67.35	19.66
3	0.00	3.91	72.23	10.85
4	0.00	30.24	51.58	2.18
5	0.00	53.12	28.36	1.68

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Study on preparation and modification of phosphogypsum-based architectural gypsum

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