Published date: Apr 13 2020

Journal Title: KnE Engineering

Issue title: REMINE International Conference on Valorization of Mining and Industrial Wastes into Construction Materials By Alkali-activation

Pages: 228–237

DOI: 10.18502/keg.v5i4.6814

Joana Almeidajs.almeida@campus.fct.unl.ptDepartment of Civil Engineering, School of Sciences and Technology, NOVA University of Lisbon, 2829-516 Caparica, Portugal

António Santos SilvaMaterials Department, National Laboratory of Civil Engineering, 1700-066 Lisbon, Portugal

Paulina FariaCERIS and Department of Civil Engineering, School of Sciences and Technology, NOVA University of Lisbon, 2829-516 Caparica, Portugal

Alexandra RibeiroCENSE, Department of Sciences and Environmental Engineering, School of Sciences and Technology, NOVA University of Lisbon, 2829-516 Caparica, Portugal

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.

Keywords: electro-based technology, tungsten mining waste, construction material, pozzolanicity.

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