University of Oulu

Exploring the use of Mineral Carbonation and Alkali activation for the valorization of Mg-rich mine tailings

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Author: Allah, Prince1
Organizations: 1University of Oulu, Faculty of Technology, Oulu Mining School
Format: ebook
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 2.5 MB)
Pages: 72
Persistent link: http://urn.fi/URN:NBN:fi:oulu-202204201617
Language: English
Published: Oulu : P. Allah, 2022
Publish Date: 2022-04-20
Thesis type: Master's thesis (tech)
Tutor: Luukkanen, Saija
Reviewer: Srivastava, Sumit
Luukkanen, Saija
Description:

Abstract

CO₂ levels in the atmosphere has raised concerns about its influence on climate change. At the same time, mine tailings present a significant environmental problem for the mining industry. In the existing literature, two environmentally friendly technologies, CO₂ sequestration and Alkali activation are widely employed to solve these challenges. The technologies are however decoupled. Thus, this study explores the simultaneous use of both methods to solve both environmental problems: first through CO₂ sequestration using mineral carbonation of mine tailings, and then the valorization of CO₂-treated mine tailings using alkali activation. Batch experiments were first conducted to determine the leachability of Mg–rich tailings to extract Mg and Ca for carbonation. The residues of the batch experiments were dissolved in strong alkaline solution to determine their reactivity. The results indicated that the Mg-rich tailings can serve as good feedstock for Mg and Ca cations for carbonation. The Si-rich residues obtained can be activated to form a geopolymer, according to activation test. This study reveals that alkali activation and mineral carbonation can be coupled to solve both environmental problems presented by CO₂ and mine tailings. Thus, after leaching several tons of magnesium or calcium silicates from tailing, their residues can be utilized for the formation of alkali activated products.

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Copyright information: © Prince Allah, 2022. Except otherwise noted, the reuse of this document is authorised under a Creative Commons Attribution 4.0 International (CC-BY 4.0) licence (https://creativecommons.org/licenses/by/4.0/). This means that reuse is allowed provided appropriate credit is given and any changes are indicated. For any use or reproduction of elements that are not owned by the author(s), permission may need to be directly from the respective right holders.
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