CO 2 mineralization by burnt oil shale and cement bypass dust: effect of operating temperature and pre-treatment
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CO2 mineralization by burnt oil shale and cement bypass dust: effect of operating temperature and pre‑treatment Can Rüstü Yörük1 · Mai Uibu1 · Mustafa Cem Usta1 · Tiit Kaljuvee1 · Andres Trikkel1 Received: 31 July 2019 / Accepted: 13 January 2020 © Akadémiai Kiadó, Budapest, Hungary 2020
Abstract The alkaline wastes such as burnt oil shale (BOS) and cement bypass dust (BPD) generally contain free lime and portlandite which make them suitable sorbent materials for CO2 trapping via mineral carbonation technique of carbon capture and sequestration. In order to study the reaction kinetics and effect of operating parameters on carbonation processes of such alkaline wastes for future industrial sized scale-ups, as well as to identify the effects on carbonation capacity when these sorbents undergo pre-treatment and are exposed to different temperatures, BOS and BPD as sorbents in CO2 mineralization process have been investigated with thermal analysis methods in the current work. Results indicate that selected types of BOS and BPD could be used as binders in the C O2 mineralization systems, binding reasonably good amount of C O2 already in the early stage of the carbonation process which later slows down as the rate of CaO carbonation becomes mainly diffusion controlled. Increased process temperature and hydration as pre-treatment improve the CO2 binding ability, while the effect of milling has been found to be staggering and not as significant as the effect of hydration and temperature rise. The appropriate kinetic mechanism functions were determined, and the kinetic parameters—activation energy (Ea) and pre-exponential factor (A) values were calculated for all the samples. The Ea values of hydrated samples are lower for BOS samples compared to non-hydrated samples. It was shown that activation by hydration enables to reach the same CO2 uptake levels at lower temperatures, thereby making the mineralization process more energy efficient and thus lowering the costs. Keywords CCS · Mineral carbonation · Oil shale ash · Bypass dust
Introduction The exploitation of fossil fuels for industrial and home uses results in atmospheric emissions of C O2 and the production of other greenhouse gases that have deleterious effects on the planet’s environment. Environmentally unsafe disposal of ashes which are produced from fossil fuel combustion is also additional negative side effect of fossil fuel combustion. Many approaches have been developed to reduce C O2 emissions, and carbon capture and sequestration (CCS) has been the limelight as the most promising method [1–3]. Mineral carbonation is one of the alternative CCS applications that can contribute to reduction in C O2 emissions and provide another advantageous way to geological storage * Can Rüstü Yörük [email protected] 1
Department of Materials and Environmental Technology, Tallinn University of Technology, Ehitajate tee 5, 19086 Tallinn, Estonia
and help the world’s transition to a lower-carbon economy. Mineral carbonation is a relatively new idea emer
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