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Title: Precipitated calcium carbonates : recycling carbon dioxide and industrial waste brines
Author: Chaliulina, Roneta
ISNI:       0000 0004 8498 4843
Awarding Body: University of Aberdeen
Current Institution: University of Aberdeen
Date of Award: 2019
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Since the industrial revolution, the burning of fossil fuels has rapidly increased carbon dioxide concentration in the atmosphere, contributing towards anthropogenic global warming and climate change. The reliance on geological and biological regulation of CO2 levels has been compromised by overpopulation and deforestation. Carbon capture, storage and various utilisation routes have been proposed as part of a worldwide greenhouse gas emissions mitigation initiative to limit the increase of global temperature to 1.5 °C (UNFCCC, 2015). Expensive and controversial geological storage has received both public and political criticism leading to the rise of alternative carbon solutions. Carbon capture and mineralisation (CCM) is gaining traction as an important avenue for carbon capture as well as the production of low-carbon materials. Unconstrained by the lack of infrastructure or depleted oil fields, preconditions which are critical for the implementation of geological storage, CCM produces valuable minerals with a wide range of industrial applications with a potential to overcome the financial implications of carbon capture. This thesis concentrates on mineralisation, which entails the combination of dissolved CO2 and synthetic produced water brine solutions in order to precipitate various carbonate minerals, primarily targeting a hydrated polymorph of calcium carbonate: monohydrocalcite (MHC). MHC has no known commercial applications, however, it shares many properties with other widely utilised carbonate minerals, such as calcite. A lot is unknown about the mechanism behind precipitation and persistence of MHC. Experiments detailed in this thesis showed that MHC precipitated in the presence of Ca and Mg ions and described optimum conditions for MHC synthesis. Utilisation of alternative brines allowed for a comparison between MHC doped with Mg, Cu and Co ions which helped to understand the role of hydration in the kinetic stabilisation of MHC. MHC showed potential as a precursor for the production of valuable aragonite, as well as a versatile functional filler.
Supervisor: Cuesta, Angel ; McPhee, D. ; Glasser, F. P. Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available
Keywords: Calcium carbonate ; Carbon sequestration ; Factory and trade waste ; Recycling (Waste, etc.) ; Carbonate minerals