Carbon dioxide dissolution and ammonia losses in bubble columns for precipitated calcium carbonate (PCC) production
| Autor: | Mika Järvinen, Arshe Said, Daniel Legendre, Ron Zevenhoven |
|---|---|
| Přispěvatelé: | Åbo Akademi University, Department of Chemical and Metallurgical Engineering, Department of Mechanical Engineering, Aalto-yliopisto, Aalto University |
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Materials science
020209 energy Carbonation MASS-TRANSFER Mixing (process engineering) Alkalinity Bubble swarm dissolution Precipitated calcium carbonate (PCC) 02 engineering and technology ESCAPE Industrial and Manufacturing Engineering chemistry.chemical_compound 020401 chemical engineering Carbon dioxide capture and utilisation (CCU) Ammonia 0202 electrical engineering electronic engineering information engineering Mass transfer 0204 chemical engineering Electrical and Electronic Engineering CO2 ABSORPTION ta216 Dissolution Civil and Structural Engineering Carbon dioxide (CO ) Aqueous solution business.industry Mechanical Engineering Slag Building and Construction Pollution Carbon dioxide (CO2) Steelmaking General Energy chemistry Chemical engineering GAS visual_art Carbon dioxide visual_art.visual_art_medium business |
| Zdroj: | Scopus-Elsevier |
| Popis: | The slag2PCC concept aims at transforming steelmaking slag into precipitated calcium carbonate (PCC) with market value. This paper reports on R&D work on two features that impact the overall performance and costs of slag2PCC as a carbon capture and utilisation (CCU) technology. Operating near ambient conditions, calcium is selectively leached from steelmaking slag using aqueous ammonium salt solvent, followed by carbonation using a CO2-containing stream. Separators for removing spent slag and PCC connect two reactors for extraction and carbonation, respectively, between which the solvent solution is cycling. One requirement is effective conversion of the CO2 fed to the system: while the dissolution of CO2 is the rate-liming step it is essential to minimise release of unreacted CO2. Mixing the solutions enhances mass transfer. High-speed video recordings were made around mixers located at various heights in a bubble column, analysing CO2 bubble swarm dissolution. A second feature studied are losses of ammonia (NH3) from the solution. An outlet for unreacted gas presents a risk of NH3 vapour release, which lowers solution alkalinity while adding costs. Multicomponent mixture mass transfer analysis showed that diffusion of NH3 into CO2 bubbles may be significant at least during initial stages of dissolution. Experimental findings were verified. (C) 2019 Elsevier Ltd. All rights reserved. |
| Databáze: | OpenAIRE |
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