Hanein, T. orcid.org/0000-0002-3009-703X, Simoni, M., Woo, C.L. et al. (2 more authors) (2021) Decarbonisation of calcium carbonate at atmospheric temperatures and pressures, with simultaneous CO2 capture, through production of sodium carbonate. Energy & Environmental Science, 14 (12). pp. 6595-6604. ISSN 1754-5692
Abstract
The calcination of calcium carbonate (CaCO3) is a major contributor to carbon dioxide (CO2) emissions that are changing our climate. Moreover, the calcination process requires high temperatures (~900°C). A novel low-temperature process for the decarbonisation of CaCO3 is tested whereby the CO2 is directly sequestered/mineralised in sodium carbonate. CaCO3 is reacted with an aqueous sodium hydroxide solution by mixing under atmospheric temperatures and pressures. The reaction products are calcium hydroxide (hydrated lime; Ca(OH)2) and sodium carbonate (soda ash; Na2CO3). For the first time, the extent of this reaction at ambient conditions is studied along with the NaOH requirements. Conceptual process designs, which include procedures to separate and recover material, as well as energy calculations, are also presented to demonstrate technical/industrial feasibility of the process. The technology is also successfully tested on industrially sourced limestone chalk, and the silica impurity remains inert throughout the process. This technology will enable industrial symbiosis by combining the high-temperature lime and sodium carbonate manufacturing processes into a single low-temperature process and greatly reduce the chemical (raw material) CO2 emissions associated with the production of cement and lime.
Metadata
Item Type: | Article |
---|---|
Authors/Creators: |
|
Copyright, Publisher and Additional Information: | © 2021 The Authors. This article is licensed under a Creative Commons Attribution 3.0 Unported Licence (http://creativecommons.org/licenses/by/3.0/). |
Keywords: | Calcium carbonate; Decarbonisation; Sodium carbonate; Sodium hydroxide; Low-carbon technology; Manufacturing; Cement; Lime; Soda ash |
Dates: |
|
Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Materials Science and Engineering (Sheffield) |
Funding Information: | Funder Grant number Engineering and Physical Sciences Research Council EP/R025959/1 |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 19 Nov 2021 08:27 |
Last Modified: | 15 Dec 2021 13:55 |
Status: | Published |
Publisher: | Royal Society of Chemistry (RSC) |
Refereed: | Yes |
Identification Number: | 10.1039/d1ee02637b |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:180629 |