Inorganic Chemicals Industry >

2024 , Vol. 56 >Issue 3: 98 - 104

DOI: https://doi.org/10.19964/j.issn.1006-4990.2023-0421

Environment·Health·Safety

Research on preparation and early performance of mixed phase phosphogypsum-based cementing materials

  • WANG Ruting ,
  • ZHAO Xiaorong ,
  • HUANG Xuquan ,
  • WANG Haojie ,
  • XUE Fei ,
  • CAI Jiawei
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  • 1.Engineering Research Center of Eco-environment in Three Gorges Reservoir Region，Ministry of Education，China Three Gorges University，Yichang 443002，China
    2.College of Hydraulic & Environmental Engineering，China Three Gorges University，Yichang 443002，China
    3.Yichang Key Laboratory of Solid Waste Disposal and Resource Utilization，China Three Gorges University，Yichang 443002，China
    4.Hubei Province Enterprise-college Cooperation Innovation Center for Comprehensive Utilization of Phosphogypsum，Yichang 443002，China

Received date: 2023-08-23

  Online published: 2024-03-14

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Abstract

Mixed phase phosphogypsum was used as the main raw material，and slag，red mud，metakaolin and clinker were added to prepare mixed phase phosphogypsum-based cementing material.Its early performance was studied by compressive strength，pH and leaching toxicity tests，and the hydration mechanism was elaborated by X-ray diffraction（XRD），scanning electron microscope（SEM） and Fourier transform infrared spectroscopy（FT-IR） tests.The results showed that 53.76%（mass fraction，the same below） of mixed phase phosphogypsum，9.68% of slag，9.68% of red mud，16.13% of metakaolin and 10.75% of clinker could prepare the mixed phase phosphogypsum cementing material with optimized performance，and its compressive strength at the 3，5 d and 7 d were 8.93，10.99 MPa and 13.14 MPa respectively.Its pH alkalinity was lower than that of traditional cement-based materials，and the leaching concentration of PO43- and F- were lower than the limit of the integrated wastewater discharge standard.The results of microscopic analysis showed that phosphogypsum was calcined at 400 ℃ for 60 min to form hemihydrate-anhydrate mixed phase phosphogypsum，in which the relative contents of hemihydrate and anhydrate gypsum were 31.7% and 68.3% respectively.The hydrated calcium silicate gel，ettringite and brushite generated by hydration of mixed phase phosphogypsum-based cementing materials formed dense structures，which would improve the strength of materials and block the leaching of pollutants.The mixed phase phosphogypsum-based cementing material had good mechanical properties and environmental compatibility，which provided a new potential way for the large-scale consumption of phosphogypsum.

Key words： phosphogypsum; mixed phase; cementing material; leaching toxicity; micro structure

Cite this article

WANG Ruting , ZHAO Xiaorong , HUANG Xuquan , WANG Haojie , XUE Fei , CAI Jiawei . Research on preparation and early performance of mixed phase phosphogypsum-based cementing materials[J]. Inorganic Chemicals Industry, 2024 , 56(3) : 98 -104 . DOI: 10.19964/j.issn.1006-4990.2023-0421

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