球磨时间对磷石膏基胶凝材料性能影响研究

doi:10.19964/j.issn.1006-4990.2021-0681

Abstract

Abstract:

Taking undisturbed phosphogypsum as the research object，on the basis of exploring the dehydration temperature and time of phosphogypsum by thermogravimetric analysis and phase composition analysis，the effect of grinding time on the size and distribution of intact phosphogypsum，hardened phosphogypsum and properties of phosphogypsum?cement binder was studied.The dehydration temperature was 130 ℃ and the dehydration time was 60 min of original phosphogypsum.In 0~20 min，the fluidity of phosphogypsum cement cements could be reduced effectively by prolonging the grinding time，and the setting time could be effectively shortened.The mechanical strength of phosphogypsum hardened body and phosphogypsum?cement increased firstly and then decreased.The optimal grinding time was 15 min，and the particle size of the original phosphogypsum was about 29 μm.The obtained phosphogypsum cement binder had better mechanical properties and its water resistance was improved.

Key words: heat treatment, grinding time, phosphogypsum, particle size distribution, mechanical property

CLC Number:

TQ126.3

XU Qingying,YANG Dingyi,LÜ Wei,LI Xiang,QIAN Yunfeng,DU Baocong. Effect of grinding time on properties of phosphogypsum based cementitious materials[J]. Inorganic Chemicals Industry, 2022, 54(5): 101-108.

Figures/Tables 14

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	w（磷石膏）/%	w（水泥）/%	水胶比（m_水∶m_胶）
磷石膏硬化体	100	0	0.85
磷石膏-水泥胶结料	50	50	0.60

时间/ min	w（CaSO₄· 2H₂O）/%	w（CaSO₄· 1/2H₂O）/%	w（CaSO₄）/ %	w（其他）/ %
0	87.6	2.4	0.0	10.0
30	60.4	18.2	11.3	10.1
40	53.1	22.6	13.2	11.1
50	42.3	31.2	15.6	10.9
60	25.7	49.5	16.2	8.6
70	24.2	42.3	22.1	11.4
80	21.1	40.7	28.6	9.6
90	19.5	37.6	33.3	9.6
100	16.2	34.3	38.4	11.1
110	14.6	30.5	44.2	10.7
120	13.4	28.2	47.1	11.3

时间/ min	w（CaSO₄· 2H₂O）/%	w（CaSO₄· 1/2H₂O）/%	w（CaSO₄）/ %	w（其他）/ %
0	87.6	2.4	0.0	10.0
30	48.4	29.5	12.2	9.9
40	40.2	34.6	15.1	10.1
50	28.4	43.1	18.7	9.8
60	10.5	60.5	20.2	8.8
70	10.1	53.1	25.5	11.3
80	8.3	49.4	31.8	10.5
90	9.1	27.7	50.5	12.7
100	8.2	20.3	58.5	13.0
110	4.4	20.2	62.8	12.6
120	2.1	12.7	74.6	10.6

球磨时间/min	中位径/μm	球磨时间/min	中位径/μm
0	90.75	15	29.69
5	58.02	20	17.15
10	49.89

球磨时间/ min	初凝时间/ s	终凝时间/ s	比表面积/（m²·kg^-1）
0	470	940	92
5	390	820	235
10	325	515	351
15	285	470	501
20	245	400	741

National Inorganic Salts Information Center

Inorganic Acid-Base-Salt Committee of CIESC

Effect of grinding time on properties of phosphogypsum based cementitious materials

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