Influence of phosphogypsum on mechanical properties and microstructure of iron tailings cementitious material

• Autorzy: Xu Jiaqi , Chen Pan , Zhang Chenyang , Yang Yaohui

Identyfikatory

DOI

10.1007/s43452-023-00831-3

• Języki publikacji: EN

Abstrakty

EN

The disposal of industrial by-product tailings has become the focus of mine follow-up work and an important issue in solving environmental pollution. This study explores the potential of utilizing iron tailings and phosphogypsum as cementitious materials, guided by the concept of comprehensive utilization. The mechanical property of cementitious materials was studied under curing 7 days, 14 days, and 28 days. The characteristics of the pores and products of the cementitious material were extracted and analyzed by industrial computed tomography (CT), X-ray diffraction (XRD), and scanning electron microscope (SEM). In the presence of phosphogypsum, more ettringite was generated in the cementitious system. The macropores in the system were filled, reducing the total porosity fraction of cementitious materials from 24.56% to 18.39%. The reduction of macropores significantly enhanced the compressive strength of cementitious material. The addition of fine phosphogypsum reduced the large porosity of the cementitious materials, which revealed the importance of the size in the cementitious material system. The effect of phosphogypsum content on the pore structure of cementitious material of iron tailings was studied. The new type of low-carbon cementitious material prepared from phosphogypsum and iron tailings provided a novel perspective for the multi-solid waste collaborative disposal in this study. In addition, the large amount of consumption of tailings reduced the pollution to the environment.

Słowa kluczowe

EN

iron tailing; phosphogypsum; total porosity; microstructure

PL

porowatość; mikrostruktura; utylizacja odpadów przemysłowych

• Wydawca: Springer ; Wrocław University of Science and Technology
• Czasopismo: Archives of Civil and Mechanical Engineering
• Rocznik: 2024
• Tom: Vol. 24, no. 1
• Strony: art. no. e18, 2024
• Opis fizyczny: Bibliogr. 52 poz., rys., wykr.

Twórcy

autor

Xu Jiaqi

• School of Minerals Processing and Bioengineering, Central South University, Changsha 410000, China

autor

Chen Pan

• College of Materials Science and Engineering, Sichuan University, Chengdu 610064, China

autor

Zhang Chenyang

• School of Minerals Processing and Bioengineering, Central South University, Changsha 410000, China

autor

Yang Yaohui

• Institute of Multipurpose Utilization of Mineral Resources, Chinese Academy of Geological Science, Chengdu 610041, China

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Uwagi

Opracowanie rekordu ze środków MNiSW, umowa nr POPUL/SP/0154/2024/02 w ramach programu "Społeczna odpowiedzialność nauki II" - moduł: Popularyzacja nauki (2025)