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Title: Carbonation of natural wollastonite at non-ambient conditions relevant for CCS : the possible use as cementitious material in wellbores
Author(s): Svensson, Kristoff
Neumann, Andreas
Feitosa Menezes, Flora
Lempp, ChristofLook up in the Integrated Authority File of the German National Library
Pöllmann, HerbertLook up in the Integrated Authority File of the German National Library
Issue Date: 2019
Type: Article
Language: English
Abstract: The reaction of wollastonite with CO2 accompanied by SO2 and NO2 in the presence of a chloride-rich brine (230 g/L NaCl, 15 g/L CaCl2, 5 g/L MgCl2) at temperatures relevant to injection conditions (333 K) in carbon capture and storage (CCS) were investigated within the joint BMWi (Federal Ministry for Economic Affairs and Energy) research project CLUSTER. The reaction which describes the formation of wollastonite during metamorphism is reversed and shows a strong temperature dependence. Wollastonite reacts in the presence of CO2 ( C¯¯¯ ) in aqueous conditions to form calcium carbonate and amorphous silicon oxide. At 333 K and 2 MPa the carbonation reaction of wollastonite ( C¯¯¯CS ) is fast (<24 h). To determine the conversion rate of the reaction quantitatively different methods were used and compared: Powder X-ray diffraction (PXRD) with the Rietveld method and differential scanning calorimetry with thermogravimetry, coupled with a mass spectrometer (DSC-TG/MS) for quantitative phase analysis and for determination of the carbonation. The carbonation (CO2 accompanied by SO2 and NO2) of natural wollastonite at 333 K in presence of chloride-rich brine was rather fast (almost complete after 24 h reaction time).
Open Access: Open access publication
License: (CC BY 4.0) Creative Commons Attribution 4.0(CC BY 4.0) Creative Commons Attribution 4.0
Sponsor/Funder: Publikationsfond MLU
Journal Title: Applied Sciences
Publisher: MDPI
Publisher Place: Basel
Volume: 9
Issue: 6
Original Publication: 10.3390/app9061259
Appears in Collections:Open Access Publikationen der MLU

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