Assessment on tungsten mining residues potential as partial cement replacement

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Abstract

Electroremediation and deep eutectic solvents are well-documented clean-up processes for metals extraction from solid matrices. Depending on the purpose, these treatments may generate a residue free of pollutants and critical raw materials. Several studies were conducted to re-insert treated secondary resources in building materials. However, there is a research gap in the improvement of reactive properties of these secondary resources. In addition, there is a lack of pozzolans that can optimize cementitious materials. This study investigates the pozzolanic reactivity of tungsten mining residues after receiving electrodialytic treatment in the presence of natural deep eutectic solvents. In all cases, thermal treatment after electroremediation potentiated the pozzolanic reactivity of tungsten mining residues, between 64% to 87%. The introduction of these pozzolanic resources in cementitious-based materials may increase their performance, enlarge the range of applications in the construction industry, reduce the environmental impact, and contribute to a circular economy.
Original languageEnglish
Pages (from-to)228–237
JournalKnE Engineering
Volume5
Issue number4
DOIs
Publication statusPublished - 13 Apr 2020
EventREMINE International Conference on Valorization of Mining and Industrial Wastes into Construction Materials by Alkali-Activation - UBI, Covilhã, Portugal
Duration: 23 Oct 201925 Oct 2019

Keywords

  • construction material
  • pozzolanicity
  • electro-based technology
  • tungsten mining waste

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