磷渣粉改性磷石膏实验研究

doi:10.11962/1006-4990.2019-0095

Abstract

Abstract:

The effect of phosphorus slag powder on the mechanical property and micro-property of raw material phosphogypsum was studied.The mechanical property was studied by bending and compression testing machine.The micro morphology was studied by SEM.Results showed that addition of FDN were 1.5‰.The additions of modified phosphorus slag powder was at 10%~15%.The flexural strength and compressive strength of phosphogypsum-based products were above 7.0 MPa and 15.0 MPa respectively.It was about 2 times than the blank sample.The micro morphologies of phosphogypsums before and af-ter hydration were analyzed by SEM.Results showed that the micro morphology of phosphogypsum-based mortar grew from flake or strip to short column or hollow tubular structure after adding phosphogypsum modified material,which greatly improved the performance index of phosphogypsum-based mortar material and provided theoretical and technical support for the production of gypsum mortar with phosphogypsum.

Key words: phosphogypsum, phosphorus slag powder, microstructure analysis

CLC Number:

TQ126.3

Zheng Shaocong,Wang Fan,Zhu Liping,Xu Chengkun. Experimental study on influence of phosphogypsum with modified phosphorus slag powder[J]. Inorganic Chemicals Industry, 2020, 52(1): 73-75.

项目	w（CaO）	w（SO₃）	w（SiO₂）	w（MgO）	w（Al₂O₃）
磷建筑石膏粉	30.34	41.38	11.92	0.50	0.35
磷渣粉	49.60	—	36.40	1.20	4.80
项目	w（Fe₂O₃）	w（P₂O₅）	w（F）	w（H₂O）
磷建筑石膏粉	0.24	0.50	0.31	14.4
磷渣粉	2.40	1.20	—	4.2

减水剂掺量/‰	标准稠度/%	2 h强度/MPa		24 h绝干强度/MPa
减水剂掺量/‰	标准稠度/%	抗折	抗压	抗折	抗压
0.0	75	2.4	6.6	3.2	9.2
0.1	65	2.6	6.8	3.4	9.4
0.3	60	2.8	7.0	3.8	10.2
0.5	58	3.0	7.4	3.6	9.8
1.0	55	2.9	7.2	3.5	9.8
1.5	54	3.0	7.2	3.4	9.9

改性磷渣粉掺量/%	标准稠度/ %	24 h绝干强度/ MPa		改性磷渣粉掺量/%	标准稠度/ %	24 h绝干强度/ MPa
改性磷渣粉掺量/%	标准稠度/ %	抗折	抗压	改性磷渣粉掺量/%	标准稠度/ %	抗折	抗压
0	70	2.6	8.6	12	42	8.2	16.3
5	42	4.3	9.8	15	42	7.7	15.6
8	42	7.2	13.0	20	42	6.0	11.2
10	42	8.0	15.4

标准稠度/%	石膏密度/ （kg·m^-3）	24 h绝干强度/MPa		标准稠度/%	石膏密度/ （kg·m^-3）	24 h绝干强度/MPa
标准稠度/%	石膏密度/ （kg·m^-3）	抗折	抗压	标准稠度/%	石膏密度/ （kg·m^-3）	抗折	抗压
70	1 050	2.6	8.6	45	1 375	7.4	14.6
60	1 153	3.8	7.3	42	1 453	8.5	17.5
50	1 300	6.2	12.1

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Inorganic Acid-Base-Salt Committee of CIESC

Experimental study on influence of phosphogypsum with modified phosphorus slag powder

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