Design of a Continuous Process Setup for Precipitated Calcium Carbonate Production from Steel Converter Slag

Hannu-Petteri Mattila, Ron Zevenhoven

    Research output: Contribution to journalArticleScientificpeer-review

    17 Citations (Scopus)

    Abstract

    A mineral carbonation process slag2PCC for carbon capture, utilization, and storage is discussed. Ca is extracted from steel slag by an ammonium salt solvent and carbonated with gaseous CO2 after the separation of the residual slag. The solvent is reused after regeneration. The effects of slag properties such as the content of free lime, fractions of Ca, Si, Fe, and V, particle size, and slag storage on the Ca extraction efficiency are studied. Small particles with a high free-lime content and minor fractions of Si and V are the most suitable. To limit the amount of impurities in the process, the slag-to-liquid ratio should remain below a certain value, which depends on the slag composition. Also, the design of a continuous test setup (total volume approximate to 75L) is described, which enables quick process variations needed to adapt the system to the varying slag quality. Different precipitated calcium carbonate crystals (calcite and vaterite) are generated in different parts of the setup.
    Original languageUndefined/Unknown
    Pages (from-to)903–913
    Number of pages11
    JournalChemSusChem
    Volume7
    Issue number3
    DOIs
    Publication statusPublished - 2014
    MoE publication typeA1 Journal article-refereed

    Keywords

    • calcium
    • carbon storage
    • environmental chemistry
    • industrial chemistry
    • waste prevention

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