Preliminary assessment of a method utilizing carbon dioxide and steelmaking slags to produce precipitated calcium carbonate

Sanni Eloneva*, Arshe Said, Carl Johan Fogelholm, Ron Zevenhoven

*Corresponding author for this work

    Research output: Contribution to journalArticleScientificpeer-review

    109 Citations (Scopus)

    Abstract

    One of the options that can contribute to the reduction of carbon dioxide emissions for climate change mitigation is the so-called CO2 sequestration by mineral carbonation, or CO2 mineral sequestration. Steel manufacturing could benefit from this option by utilizing its own by-products, i.e. steelmaking slags to combine with CO2. We have recently studied a method, where aqueous solution of ammonium salt (e.g. ammonium acetate, ammonium nitrate and ammonium chloride) is used to extract calcium selectively from the steel converter slag, followed by precipitation of pure calcium carbonate by bubbling CO2 through the produced solution. The ammonium salt solution is recovered and re-used. The purpose of this research was to determine if the economic potential of the method warrants moving forward to large-scale application. Despite the small solvent losses, the method was found to have economical potential. In addition, it has significant CO2 emission reduction potential as well. Scaling up the reactor from the small laboratory scale will allow more detailed design for the process to be made followed by a full economical evaluation including all of the important operational and capital investment costs.

    Original languageEnglish
    Pages (from-to)329-334
    Number of pages6
    JournalApplied Energy
    Volume90
    Issue number1
    DOIs
    Publication statusPublished - Feb 2012
    MoE publication typeA1 Journal article-refereed

    Keywords

    • Ammonium salt
    • Calcium carbonate
    • Mineral carbonation
    • Potential
    • Steelmaking slag

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