CO2 fixation using magnesium silicate minerals part 1: Process description and performance

Johan Fagerlund, Experience Nduagu, Inês Romão, Ron Zevenhoven*

*Corresponding author for this work

    Research output: Contribution to journalArticleScientificpeer-review

    61 Citations (Scopus)

    Abstract

    This paper describes a staged carbonation process for magnesium silicate mineral carbonation. This carbon dioxide capture and storage (CCS) alternative involves the production of magnesium hydroxide, followed by its carbonation in a pressurised fluidised bed (PFB) reactor. The goal is to utilise the heat of the carbonation reaction to drive the Mg(OH)2 production step. The results show that Mg(OH)2 can be produced successfully (up to 78% Mg extraction extent achieved so far) and efficiently from different serpentinite minerals from locations worldwide (Finland, Lithuania, Australia, Portugal...). From the extraction step, ammonium sulphate is recovered while iron oxides (from the mineral) are obtained as by-products. The carbonation step, while still being developed, resulted in >50%-wt conversion in 10 min (500°C, 20 bar) for > 300 μm serpentinite-derived Mg(OH)2 particles. Thus the reaction rate achieved so far is much faster than what is currently being considered fast in the field of mineral carbonation.

    Original languageEnglish
    Pages (from-to)184-191
    Number of pages8
    JournalEnergy
    Volume41
    Issue number1
    DOIs
    Publication statusPublished - May 2012
    MoE publication typeA1 Journal article-refereed

    Keywords

    • Carbon dioxide capture and storage
    • Gas-solid carbonation
    • Staged process

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