半水磷石膏参与固化原状磷石膏制备复合胶凝材料

doi:10.19964/j.issn.1006-4990.2021-0553

Abstract

Abstract:

The phosphogypsum-based composite cementitious material（PBCM）was prepared by using hemihydrate phospho-gypsum（HPG）with ash calcium powder and cement to solidify the raw phosphogypsum（RPG）.The single factor experiments was carried out to investigate the influence of HPG content on PBCM slurry performance,and the effects of various admixtures on the strength and water resistance of PBCM were further explored through orthogonal experiments.The results showed that HPG was an effective and environmental solidification material for RPG,more than 20%（mass fraction）of HPG could com-pletely solve the bleeding problem and significantly shorten the setting time of PBCM slurry.The slurry fluidity was effectively improved by more than 40%（mass fraction）of HPG.The HPG,ash calcium powder and cement could effectively improve the strength of PBCM.The effect of cement on water resistance was significant.Microscopic analysis was revealed that the main hydrates of PBCM were CaSO₄·2H₂O and ettringite,which were interweaved with each other and grow between the RPG crystals,so as to realize the effective solidification of RPG.

Key words: raw phosphogypsum, hemihydrate phosphogypsum, phosphogypsum-based composite cementitious materials, strength, softening coefficient

CLC Number:

TQ126.3

MIAO Xun,LU Yuexian,FU Rusong,KONG Dewen,FU Rubin,HU Qun. Hemihydrate phosphogypsum as used to solidify the raw phosphogypsum to prepare composite cementitious material[J]. Inorganic Chemicals Industry, 2022, 54(4): 10-16.

Figures/Tables 8

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References 25

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原料	w（SO₃）	w（CaO）	w（SiO₂）	w（P₂O₅）	w（F）	w（Fe₂O₃）	w（Al₂O₃）	w（MgO）	w（K₂O）	w（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
灰钙粉	0.24	98.29	0.60	0.01	—	0.11	0.14	0.58	—	0.01
水泥	3.96	61.71	19.9	0.17	—	4.46	5.16	1.73	—	0.16

水平	因素
水平	A m（RPG）∶m（HPG）	B 灰钙粉掺量/%	C 水泥掺量/%
1	85∶15	1	6
2	75∶25	2	9
3	65∶35	3	12

组号		编号	因素			测试结果
组号		编号	m（RPG）∶ m（HPG）（A）	w（灰钙粉）/% （B）	w（水泥）/% （C）	抗压强度（28 d）/MPa	软化系数（28 d）
1		PBCM-1	85∶15	1	6	4.19	0.46
2		PBCM-2	85∶15	2	9	5.96	0.48
3		PBCM-3	85∶15	3	12	9.18	0.51
4		PBCM-4	75∶25	1	9	8.32	0.40
5		PBCM-5	75∶25	2	12	8.43	0.52
6		PBCM-6	75∶25	3	6	7.01	0.41
7		PBCM-7	65∶35	1	12	9.38	0.54
8		PBCM-8	65∶35	2	6	8.88	0.40
9		PBCM-9	65∶35	3	9	8.54	0.45
抗压强度（28 d）/MPa	K₁		6.44	7.30	6.69
	K₂		7.92	7.76	7.61
	K₃		8.93	8.24	9.00
	R		2.49	0.95	2.31
	影响程度			A>C>B
	最优水平		A₃	B₃	C₃
	最优组合			A₃B₃C₃
软化系数（28 d）	K₁		0.48	0.47	0.42
	K₂		0.44	0.47	0.44
	K₃		0.46	0.46	0.52
	R		0.04	0.01	0.10
	影响程度			C>A>B
	最优水平		A₁	B₁	C₃
	最优组合			A₁B₁C₃

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Hemihydrate phosphogypsum as used to solidify the raw phosphogypsum to prepare composite cementitious material

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