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

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

*Korresponderande författare för detta arbete

Forskningsoutput: Kapitel i bok/konferenshandlingKonferensbidragVetenskapligPeer review

Sammanfattning

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.

OriginalspråkEngelska
Titel på gästpublikationECOS 2007 - Proceedings of the 20th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems
RedaktörerAlberto Mirandola, Ozer Arnas, Andrea Lazzaretto
FörlagUniversita degli Studi di Padova
Sidor1333-1340
Antal sidor8
ISBN (elektroniskt)9788889884089
StatusPublicerad - 2007
MoE-publikationstypA4 Artikel i en konferenspublikation
Evenemang20th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems, ECOS 2007 - Padova, Italien
Varaktighet: 25 jun 200728 jun 2007

Publikationsserier

NamnECOS 2007 - Proceedings of the 20th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems
Volym2

Konferens

Konferens20th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems, ECOS 2007
Land/TerritoriumItalien
OrtPadova
Period25/06/0728/06/07

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