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Effect of Lime on Properties of Filling Cementitious Material Prepared by Hemihydrate Phosphogypsum
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Guanzhao JIANG1, Aixiang WU1, Yiming WANG1, Jianqiu LI2
Journal of the Chinese Ceramic Society | 2020, 48(1) : 86 - 93
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Journal of the Chinese Ceramic Society | 2020, 48(1): 86-93
Effect of Lime on Properties of Filling Cementitious Material Prepared by Hemihydrate Phosphogypsum
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Guanzhao JIANG1, Aixiang WU1, Yiming WANG1, Jianqiu LI2
Affiliations
  • 1.School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China
  • 2.School of Chemistry and Chemical Engineering, Guizhou University, Guiyang 550025, China

    • JIANG Guanzhao (1993-), male, Ph.D. candidate. E-mail:

About Author:

JIANG Guanzhao (1993-), male, Ph.D. candidate. E-mail:

Published: 2020-01-20 doi: 10.14062/j.issn.0454-5648.20190314
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The gelling activity of hemihydrate phosphogypsum (HPG) is poor and its setting process is slow due to the effect of soluble impurities such as P2O5 and F-. Compared to cement clinker, the strength of HPG modified with lime as a hemihydrate phosphogypsum filling cementitious material (HCM) for goaf filling can be improved. The setting time and bleeding rate of HCM decrease rapidly and then increase slowly, and the compressive strength reverses with the increase of lime. Also, the concentration of total phosphorus and fluoride in the HCM leaching solution gradually decreases to below the standard values from the National Standard of Class I Solid Wastes. For the filling performance and environmental protection, the optimum mass fraction of lime in HCM is 2.0%. Lime can transform soluble P2O5 and F- into insoluble precipitates such as Ca3(PO4)2 and CaF2 to accelerate HPG hydration, increase the number of dihydrate gypsum crystal contact points, and further improve the HCM filling performance. The experimental pH value of HCM leaching solution is lower than the theoretical value, indicating that P2O5 in crystal can dissolve into soluble P2O5 in the process of HPG hydration, thus leading to a decreased alkalinity of backfill.

lime  /  hemihydrate phosphogypsum  /  material properties  /  modification mechanism  /  mining backfill
姜关照, 吴爱祥, 王贻明, 李剑秋. 生石灰对半水磷石膏充填胶凝材料性能影响. 硅酸盐学报, 2020 , 48 (1) : 86 -93 . DOI: 10.14062/j.issn.0454-5648.20190314
Guanzhao JIANG, Aixiang WU, Yiming WANG, Jianqiu LI. Effect of Lime on Properties of Filling Cementitious Material Prepared by Hemihydrate Phosphogypsum[J]. Journal of the Chinese Ceramic Society, 2020 , 48 (1) : 86 -93 . DOI: 10.14062/j.issn.0454-5648.20190314
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Year 2020 volume 48 Issue 1
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Article Info
doi: 10.14062/j.issn.0454-5648.20190314
  • Receive Date：2019-05-13
  • Online Date：2026-10-29
  • Published：2020-01-20
Article Data
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History
  • Received：2019-05-13
  • Revised：2019-07-03
Funding
Affiliations
    1.School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China
    2.School of Chemistry and Chemical Engineering, Guizhou University, Guiyang 550025, China

Corresponding:

WU Aixiang (1963-), male, Ph.D., Professor. E-mail:
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表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
total species (%)		 属
Genus		 种数
Number of
species		 占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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