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Research Article

Fabrication of green one-part geopolymer from silica-rich vanadium tailing via thermal activation and modification

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  • Received: 26 June 2020Revised: 10 August 2020Accepted: 31 August 2020Available online: 3 September 2020
  • The aim of this investigation is to prepare geopolymeric precursor using vanadium tailing (VT) by thermal activation and modification. The homogeneous blend of VT and sodium hydroxide is calcinated at elevated temperature for activation and then was modified with metakaolin to assemble geopolymeric precursor. During the thermal activation, the VT is corroded by sodium hydroxide, and then forms sodium silicate on the particles surface. After water is added, the sodium silicate coating is dissolved to release silicon species and create alkaline solution environment, and then the metakaolin dissolved in the alkaline environment to provide aluminum species, followed by geopolymerization. Meanwhile, the VT particles are connected together by gel produced from geopolymerization, resulted in geopolymer with excellent mechanical performance. This investigation not only improves the feasibility of geopolymer technology in large-scale and in-situ applications, but also benefits the utilization of VT and other silica-rich solid wastes.
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Fabrication of green one-part geopolymer from silica-rich vanadium tailing via thermal activation and modification

  • Corresponding author:

    Shen-xu Bao    E-mail: sxbao@whut.edu.cn

  • 1. Hubei Key Laboratory of Mineral Resources Processing and Environment, Wuhan University of Technology, Wuhan 430070, China
  • 2. School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan 430070, China
  • 3. State Environmental Protection Key Laboratory of Mineral Metallurgical Resources Utilization and Pollution Control, Wuhan University of Science and Technology, Wuhan 430081, China
  • 4. Hubei Collaborative Innovation Center for High Efficient Utilization of Vanadium Resources, Wuhan University of Science and Technology, Wuhan 430081, China

Abstract: The aim of this investigation is to prepare geopolymeric precursor using vanadium tailing (VT) by thermal activation and modification. The homogeneous blend of VT and sodium hydroxide is calcinated at elevated temperature for activation and then was modified with metakaolin to assemble geopolymeric precursor. During the thermal activation, the VT is corroded by sodium hydroxide, and then forms sodium silicate on the particles surface. After water is added, the sodium silicate coating is dissolved to release silicon species and create alkaline solution environment, and then the metakaolin dissolved in the alkaline environment to provide aluminum species, followed by geopolymerization. Meanwhile, the VT particles are connected together by gel produced from geopolymerization, resulted in geopolymer with excellent mechanical performance. This investigation not only improves the feasibility of geopolymer technology in large-scale and in-situ applications, but also benefits the utilization of VT and other silica-rich solid wastes.

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