Co-utilisation of CO2 and calcium silicate-rich slags for precipitated calcium carbonate production (part II)

Sanni Eloneva, Sebastian Teir, Jaakko Savolahti, Carl Johan Fogelholm, Ron Zevenhoven

Research output: Chapter in Book/Conference proceedingConference contributionScientificpeer-review

5 Citations (Scopus)

Abstract

Production of commercial calcium carbonate from calcium silicate-rich slag is an attractive concept for reducing CO2 emissions. In order for this calcium carbonate to be marketable it has to be very pure, requiring separation of calcium from the slag prior to carbonation. In this study, a process concept that produces relatively pure calcium carbonate from slag is presented. It uses an aqueous solution of acetic acid to dissolve blast furnace slag, followed by removal of residues and evaporation of the acid to produce acetate, which is then dissolved in water before CO2 is introduced. The alkalinity of the solution is raised by addition of sodium hydroxide, which causes calcium to precipitate as calcium carbonate. The fate of other elements released from the slag during the process was studied as well. It was found that while Si, Ti and Zr can be separated by facilitating gel formation, Al, V, Mn, Fe, and Ba require additional separation methods to produce pure calcium carbonate. The process also requires additional measures for preventing sulphuric vapour emissions. The economical feasibility of the proposed process was also investigated. The evaporation step was found to be expensive, unless the process could be integrated with a waste heat source. Recovery of the sodium acetate solution, a by-product of the carbonation step, was also considered necessary for the process to be economically feasible.

Original languageEnglish
Title of host publicationECOS 2007 - Proceedings of the 20th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems
EditorsAlberto Mirandola, Ozer Arnas, Andrea Lazzaretto
PublisherUniversita degli Studi di Padova
Pages1389-1396
Number of pages8
ISBN (Electronic)9788889884089
Publication statusPublished - 2007
MoE publication typeA4 Article in a conference publication
Event20th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems, ECOS 2007 - Padova, Italy
Duration: 25 Jun 200728 Jun 2007

Publication series

NameECOS 2007 - Proceedings of the 20th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems
Volume2

Conference

Conference20th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems, ECOS 2007
CountryItaly
CityPadova
Period25/06/0728/06/07

Keywords

  • Acetic acid
  • Blast furnace slag
  • CO utilisation
  • Mineral carbonation

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