Environment·Health·Safety

Effect of grinding time on properties of phosphogypsum based cementitious materials

  • Qingying XU ,
  • Dingyi YANG ,
  • Wei Lü ,
  • Xiang LI ,
  • Yunfeng QIAN ,
  • Baocong DU
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  • 1.College of Civil Science and Engineering,Yangzhou University,Yangzhou 225127,China
    2.Research Institute of Green Building Materials,Yangzhou University
    3.Hubei Changyao New Material Stock Corporation

Received date: 2021-11-10

  Online published: 2022-05-31

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.

Cite this article

Qingying XU , Dingyi YANG , Wei Lü , Xiang LI , Yunfeng QIAN , Baocong DU . Effect of grinding time on properties of phosphogypsum based cementitious materials[J]. Inorganic Chemicals Industry, 2022 , 54(5) : 101 -108 . DOI: 10.19964/j.issn.1006-4990.2021-0681

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