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

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

*Tämän työn vastaava kirjoittaja

Tutkimustuotos: Artikkeli kirjassa/raportissa/konferenssijulkaisussaKonferenssiartikkeliTieteellinenvertaisarvioitu

Abstrakti

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.

AlkuperäiskieliEnglanti
OtsikkoECOS 2007 - Proceedings of the 20th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems
ToimittajatAlberto Mirandola, Ozer Arnas, Andrea Lazzaretto
KustantajaUniversita degli Studi di Padova
Sivut1333-1340
Sivumäärä8
ISBN (elektroninen)9788889884089
TilaJulkaistu - 2007
OKM-julkaisutyyppiA4 Artikkeli konferenssijulkaisuussa
Tapahtuma20th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems, ECOS 2007 - Padova, Italy
Kesto: 25 kesäkuuta 200728 kesäkuuta 2007

Julkaisusarja

NimiECOS 2007 - Proceedings of the 20th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems
Vuosikerta2

Konferenssi

Konferenssi20th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems, ECOS 2007
MaaItaly
KaupunkiPadova
Ajanjakso25/06/0728/06/07

Sormenjälki Sukella tutkimusaiheisiin 'Fixation of CO<sub>2</sub> by dissolution of serpentinite and precipitation of magnesium carbonates'. Ne muodostavat yhdessä ainutlaatuisen sormenjäljen.

Viittausmuodot