University of Oulu

Priyadharshini Perumal, Jenni Kiventerä, Mirja Illikainen, Influence of alkali source on properties of alkali activated silicate tailings, Materials Chemistry and Physics, Volume 271, 2021, 124932, ISSN 0254-0584, https://doi.org/10.1016/j.matchemphys.2021.124932

Influence of alkali source on properties of alkali activated silicate tailings

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Author: Perumal, Priyadharshini1; Kiventerä, Jenni1; Illikainen, Mirja1
Organizations: 1Faculty of Technology, Fibre and Particle Engineering Research Unit, PO Box 4300, University of Oulu, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 11.9 MB)
Persistent link: http://urn.fi/urn:nbn:fi-fe2021090845552
Language: English
Published: Elsevier, 2021
Publish Date: 2021-09-08
Description:

Abstract

Mining activities are inevitable for the growing industrialization and urbanization in the world. Disposal of mine tailings creates a severe impact to the environment and ultimately to the society. Identifying the applications of mine tailings as potential secondary raw materials would help the mining industries in achieving circular economy. Alkali activation of tailings for their utilization as building materials or backfill in mining sites is one such popular technique. In this paper, mechanically treated silicate tailings rich in magnesium/aluminum content were chosen, to be used as aluminosilicate precursors. The effect of different alkaline sources was accessed by using sodium silicate (Na₂SiO₃), sodium sulphate (Na₂SO₄) and sodium carbonate (Na₂CO₃) as activators. Alkali activated tailings pastes were studied by examining the compressive strength and microstructural properties. High magnesium tailings show good strength results with sodium silicate activator whereas sulphate-based activator performed well in high alumina tailings. Sodium carbonate seems to be efficient in early phases but does not display improvement in later ages. This behavior of alkali activated tailings with different alkali sources were tried to be correlated with the mineralogy of the tailings and its reactivity using FTIR, XRD and TGA.

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Series: Materials chemistry and physics
ISSN: 0254-0584
ISSN-E: 1879-3312
ISSN-L: 0254-0584
Volume: 271
Article number: 124932
DOI: 10.1016/j.matchemphys.2021.124932
OADOI: https://oadoi.org/10.1016/j.matchemphys.2021.124932
Type of Publication: A1 Journal article – refereed
Field of Science: 116 Chemical sciences
215 Chemical engineering
212 Civil and construction engineering
Subjects:
Funding: The authors gratefully acknowledge the financial support received from the project GEOMINS [grant #319676: Steps towards the use of mine tailings in geopolymer materials: reactivity, CO2 sequestration and heavy metal stabilization] funded by Academy of Finland. The authors appreciate the contribution from companies, Boliden and Sibelco for arranging the tailings for this work. PP acknowledges the funding received from the European Union's Horizon 2020 research and innovation programme under the Marie Skłodowska Curie grant agreement No [839848].
Academy of Finland Grant Number: 319676
Detailed Information: 319676 (Academy of Finland Funding decision)
Copyright information: © 2021 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
  https://creativecommons.org/licenses/by/4.0/