Production of calcium carbonate from steelmaking slag and captured CO2- optimisation of the carbonation process and product quality
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Journal Title
Journal ISSN
Volume Title
Insinööritieteiden korkeakoulu |
Master's thesis
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Author
Date
2016-12-12
Department
Major/Subject
Innovative and Sustainable Energy Engineering
Mcode
IA3025
Degree programme
Master’s Programme in Energy and HVAC Technology
Language
en
Pages
82+12
Series
Abstract
The X2PCC pilot plant produces precipitated calcium carbonate (PCC) from calcium extracted from steel slag and CO2 gas. This work investigates the carbonation process in order to optimise it to produce PCC of the desired morphology and size. A literature review is presented showing the potential effects of different parameters on the morphology, size and quality of the PCC produced. Experiments are conducted varying different parameters and the morphology and size of the PCC are analysed based on this. Supersaturation is seen as key to understanding and controlling the process, so a model is built to show the supersaturation of the system. This involves activity coefficient modelling using the Pitzer model and estimations of the CO2 solubility and solubility product, Ksp. Pure rhombohedral calcite is produced and needle-like aragonite is produced up to a purity of 70%.Description
Supervisor
Järvinen, MikaThesis advisor
Said, ArsheKeywords
PCC, precipitation, calcium carbonate, Pitzer model, supersaturation, steel slag
