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Design of a Continuous Process Setup for Precipitated Calcium Carbonate Production from Steel Converter Slag
Author(s) -
Mattila HannuPetteri,
Zevenhoven Ron
Publication year - 2014
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201300516
Subject(s) - carbonation , slag (welding) , lime , calcium carbonate , metallurgy , vaterite , materials science , calcite , chemical engineering , particle size , impurity , extraction (chemistry) , ammonium carbonate , chemistry , carbonate , mineralogy , inorganic chemistry , chromatography , composite material , aragonite , engineering , organic chemistry
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 CO 2 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.