Design of a Continuous Process Setup for Precipitated Calcium Carbonate Production from Steel Converter Slag. Issue 3 (27th February 2014)

• Record Type: Journal Article
• Authors: Mattila, Hannu‐Petteri; Zevenhoven, Ron
• Is Part Of: ChemSusChem. Volume 7:Issue 3(2014:Mar.)
• Page Start: 903
• Page End: 913
• Publication Date: 2014-02-27
• Subjects: Green chemistry -- Periodicals; Sustainable engineering -- Periodicals; Chemistry -- Periodicals; Chemical engineering -- Periodicals; 660
• DOI: 10.1002/cssc.201300516
• Languages: English
• ISSNs: 1864-5631

Abstract

<abstract abstract-type="main" xml:lang="en"> <title>Abstract</title> <p>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 ∼75 L) 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.</p> </abstract>