半水磷石膏固化原状磷石膏制备胶凝材料及性能研究

doi:10.19964/j.issn.1006-4990.2021-0530

Abstract

Abstract:

Using raw phosphogypsum（RPG） as the base material，the influence law and action mechanism of the relative content of raw phosphogypsum（RPG） and β-hemihydrate phosphogypsum（HPG） and the three admixtures of quicklime，cement and silica fume on the compressive strength，flexural strength and softening coefficient of phosphogypsum?based composite cementitious materials（PGBM） were studied by single factor experiment.The results showed that the increase of the relative content of HPG，quicklime，cement and silica fume could effectively increase the strength and softening coefficient of PGBM，and silica fume had the most obvious effect.However，when the content of quicklime and cement（calculated by mass fraction） was greater than 4% and 6%，the water resistance of PGBM was not improved significantly.When the mass fraction radio of RPG and HPG was 7∶3，and the content of quicklime，cement and silica fume（calculated by mass fraction） were 4%，12% and 5% respectively，the 28 d compressive strength and softening coefficient of the specimen could reach 26.29 MPa and 0.79 respectively.The microscopic analysis showed that each admixture mainly affected the contact strength between the RPG particles through the filling rate of the hydration product，which in turn affected the strength and water resistance of the PGBM.

Key words: phosphogypsum, cementitious materials, compressive strength, softening coefficient, scanning electron microscope

CLC Number:

TQ177.375

FU Rusong,LU Yuexian,AN Hongfang,KONG Dewen,FU Rubin. Study on preparation of cementitious materials from raw phosphogypsum cured by hemihydrate phosphogypsum and their properties[J]. Inorganic Chemicals Industry, 2022, 54(6): 109-114.

Figures/Tables 7

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Table 1

Table 2

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项目	主要成分质量分数/%
项目	SO₃	CaO	SiO₂	P₂O₅	F	Fe₂O₃	Al₂O₃	MgO	K₂O	SrO
RPG	55.28	39.52	2.68	0.89	0.65	0.37	0.30	—	0.07	0.06
HPG	53.60	41.84	2.71	0.86	—	0.38	0.29	—	0.07	0.06
水泥	3.96	61.71	19.90	0.17	—	4.46	5.16	1.73	—	0.16
硅灰	0.46	0.48	97.60	0.04	—	0.07	0.81	0.21	—	—
生石灰	0.24	98.29	0.60	0.01	—	0.11	—	0.58	—	0.01

w（RPG）∶w（HPG）	生石灰掺量/%	水泥掺量/%	硅灰掺量/%	水灰质量比
100∶0，90∶10， 80∶20，70∶30， 60∶40，50∶50	—	—	—	0.23
70∶30	0，2，4，6， 8，10	—	—	0.23
70∶30	4	0，6，9，12， 15，18	—	0.23
70∶30	4	12	0，1，3， 5，7，9	0.23

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Study on preparation of cementitious materials from raw phosphogypsum cured by hemihydrate phosphogypsum and their properties

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