Fixation of CO2 by dissolution of serpentinite and precipitation of magnesium carbonates

Sebastian Teir*, Hannu Revitzer, Sanni Eloneva, Carl Johan Fogelholm, Ron Zevenhoven

*Corresponding author for this work

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

Abstract

Carbonation of abundant magnesium silicates, such as serpentinites, could provide a respectable reduction of CO2 emissions in Finland, but most mineral carbonation technologies in development demand high temperatures and high CO2 pressures. In this work, we have studied the possibility for capturing and storing CO2 by producing magnesium carbonates from solutions containing dissolved serpentinite. Common acids and bases were tested in search of a solvent for extracting magnesium from serpentinite. All acids tested were able to extract magnesium (3-26 %) from serpentinite in 1 h at room temperature, while no measurable extraction was achieved using any of the bases tested. By raising the temperature to 70 °C all magnesium was extracted in 1-2 h using mineral acids. After dissolving serpentinite in HNO3 or HCl, the filtered solutions were evaporated, producing a solid salt precipitate, which was dissolved in water. By bubbling CO2 through the solutions at atmospheric pressure a very pure magnesium carbonate (99% hydromagnesite) precipitated. The optimal alkalinity for producing a carbonate precipitate was found to be pH 9 for both solutions studied. Although the results show that pure carbonates can be produced from serpentinite, the process scheme suggested requires (re)generation of large amounts of sodium hydroxide and acid. Since recycling the spent chemicals cause more CO2 emissions due to power consumption than is stored in the carbonation process, more research is needed on lowering the requirements for additional chemicals.

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
Pages1333-1340
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

  • Carbonate
  • CO capture and storage
  • Mineral carbonation
  • Serpentine

Fingerprint Dive into the research topics of 'Fixation of CO<sub>2</sub> by dissolution of serpentinite and precipitation of magnesium carbonates'. Together they form a unique fingerprint.

Cite this