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XPS and SEM study of calcite bearing rock powders in the case of reactivity measurement with HCl solution
Author(s) -
Järvinen Lauri,
Leiro Jarkko Albert,
Bjondahl Frej,
Carletti Claudio,
Eklund Olav
Publication year - 2012
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/sia.3838
Subject(s) - calcareous , calcite , dissolution , hydrochloric acid , chemistry , scanning electron microscope , x ray photoelectron spectroscopy , reactivity (psychology) , calcium carbonate , mineralogy , nuclear chemistry , analytical chemistry (journal) , chemical engineering , inorganic chemistry , materials science , geology , chromatography , composite material , medicine , paleontology , alternative medicine , organic chemistry , pathology , engineering
The dissolution of seven natural limestones and calcareous rocks in hydrochloric acid solution was examined to investigate their capability for wet flue gas desulphurisation. All samples were crushed, ground and sieved to a size‐fraction of 150–250 µm. Thereafter they were subjected to a dissolution experiment utilising stepwise titration with hydrochloric acid. The dissolution rates of three calcareous rocks were found to be controlled by reaction kinetics, while the limestones showed mass transfer control. The surface characterisation was implemented before and after dissolution experiments using X‐ray photoelectron spectroscopy and scanning electron microscopy. Additional characterisation was carried out with X‐ray diffraction, X‐ray fluorescence and polarizing microscope. Initial reactivities have been shown to decrease in the order limestone, calcareous rock with high calcium concentration, calcareous rock with low calcium concentration. Coarse grain structure is proposed to decrease the initial reactivity. Copyright © 2011 John Wiley & Sons, Ltd.