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Appl. Sci. 2018, 8(2), 304;

The Conversion of Wollastonite to CaCO3 Considering Its Use for CCS Application as Cementitious Material

Institute for Geosciences and Geography, Martin-Luther-University of Halle-Wittenberg, Von-Seckendorff-Platz 3, 06120 Halle (Saale), Germany
Author to whom correspondence should be addressed.
Received: 21 December 2017 / Revised: 7 February 2018 / Accepted: 8 February 2018 / Published: 20 February 2018
(This article belongs to the Section Chemistry)
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The reaction of wollastonite (CaSiO3) with CO2 in the presence of aqueous solutions (H2O) and varied temperature conditions (296 K, 323 K, and 333 K) was investigated. The educts (CaSiO3) and the products (CaCO3 and SiO2) were analyzed by scanning electron microscopy (SEM), powder X-ray diffraction (PXRD), and differential scanning calorimetry with thermogravimetry coupled with a mass spectrometer and infrared spectrometer (DSC TG/MS/IR). The reaction rate increased significantly at higher temperatures and seemed less dependent on applied pressure. It could be shown that under the defined conditions wollastonite can be applied as a cementitious material for sealing wells considering CCS applications, because after 24 h the degree of conversion from CaSiO3 to CaCO3 at 333 K was very high (>90%). As anticipated, the most likely application of wollastonite as a cementitious material in CCS would be for sealing the well after injection of CO2 in the reservoir. View Full-Text
Keywords: CCS; wollastonite; carbonation; CLUSTER; CS-cement; sealing CCS; wollastonite; carbonation; CLUSTER; CS-cement; sealing

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Svensson, K.; Neumann, A.; Menezes, F.F.; Lempp, C.; Pöllmann, H. The Conversion of Wollastonite to CaCO3 Considering Its Use for CCS Application as Cementitious Material. Appl. Sci. 2018, 8, 304.

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