Investigations of the suitability of K-feldspar modified by milling for CO2 sequestration

Achimovicova, Marcela and Tóthová, Erika and Baláž, Matej and Zubrik, Anton and Erdemoglu, Murat and Birinci, Mustafa and Erdemoglu, Sema and Sis, Hikmet and Baláž, Peter (2025) Investigations of the suitability of K-feldspar modified by milling for CO2 sequestration. GEOSCIENCES AND ENGINEERING: A PUBLICATION OF THE UNIVERSITY OF MISKOLC, 13 (1). pp. 32-44. ISSN 2063-6997

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Abstract

Nowadays, carbon dioxide (CO2) emissions are one of the main factors of global warming and climate change. Controlling CO2 levels in the atmosphere and limiting global warming requires urgent action. Some minerals can be used to capture and store CO2 from the air or other sources. Mechanochemically modified K-feldspar (with KOH, Ca(OH)2, and CaO) was used for ex situ and in situ CO2 capture. In the ex situ experiment (in a thermoanalytical apparatus at 150 °C, 5 h), infrared spectroscopy indicated that mechanochemically modified K-feldspar was capable of CO2 sequestration via carbonate formation. The in situ CO2 capture experiment consists of two steps. The first step involved the mechanochemical modification of K-feldspar using Ca(OH)2 and CaO as additives during milling. The second step consisted of direct in situ CO2 sequestration in the milling chamber. X-ray diffraction patterns demonstrated the formation of the calcite phase, and thermal analysis confirmed the decomposition of such created calcite. Elemental analysis has found the binding of approximately 1.6% of carbon, and 5.23 % carbonation ratio of modified feldspar was achieved. In addition, the use of the mineral vermiculite as a natural additive for in situ sequestration of K-feldspar was investigated using the above-mentioned analytical techniques.

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