CO2 storage in solid form: a study of direct mineral carbonation
Direct mineral carbonation by an ex-situ process in an aqueous system has been investigated over the past two years. The process utilizes a slurry of water mixed with a magnesium silicate mineral, such as olivine [forsterite end member (Mg2SiO4)], or serpentine [Mg3Si2O5(OH)4]. This slurry is reacte...
Main Authors: | , , , , , |
---|---|
Language: | unknown |
Published: |
2008
|
Subjects: | |
Online Access: | http://www.osti.gov/servlets/purl/896225 https://www.osti.gov/biblio/896225 |
id |
ftosti:oai:osti.gov:896225 |
---|---|
record_format |
openpolar |
spelling |
ftosti:oai:osti.gov:896225 2023-07-30T04:02:55+02:00 CO2 storage in solid form: a study of direct mineral carbonation O'Connor, William K. Dahlin, David C. Nilsen, David N. Rush, G.E. Walters, Richard P. Turner, Paul C. 2008-02-05 application/pdf http://www.osti.gov/servlets/purl/896225 https://www.osti.gov/biblio/896225 unknown http://www.osti.gov/servlets/purl/896225 https://www.osti.gov/biblio/896225 36 MATERIALS SCIENCE 58 GEOSCIENCES 37 INORGANIC ORGANIC PHYSICAL AND ANALYTICAL CHEMISTRY ACID CARBONATES AMBIENT TEMPERATURE CARBON DIOXIDE CARBONATES CARBONIC ACID CATIONS GREENHOUSE GASES KINETICS MAGNESIUM SILICATES OLIVINE PARTIAL PRESSURE REACTION KINETICS SERPENTINE STIRRING STORAGE 2008 ftosti 2023-07-11T08:44:09Z Direct mineral carbonation by an ex-situ process in an aqueous system has been investigated over the past two years. The process utilizes a slurry of water mixed with a magnesium silicate mineral, such as olivine [forsterite end member (Mg2SiO4)], or serpentine [Mg3Si2O5(OH)4]. This slurry is reacted with sub- or supercritical carbon dioxide (CO2) to produce magnesite (MgCO3). The CO2 is dissolved in water to form carbonic acid (H2CO3), which dissociates to H+ and HCO3-. The H+ ion hydrolyzes the mineral, liberating Mg2+ cations which react with the bicarbonate to form the solid carbonate. Results of the baseline tests, conducted on ground products of the natural minerals, have demonstrated that the kinetics of the reaction are slow at ambient temperature (22 C) and subcritical CO2 pressures (below 73 atm). However, at elevated temperature and pressure, coupled with continuous stirring of the slurry and gas dispersion within the water column, significant conversion to the carbonate occurs. Extent of reaction is roughly 90% within 24 hours, at 185 C and partial pressure of CO2 (PCO2) of 115 atm. Heat pretreatment of the serpentine, coupled with bicarbonate and salt additions to the solution, improve reaction kinetics, resulting in an extent of reaction of roughly 80% within 0.5 hours, at 155 C and PCO2 of 185 atm. Subsequent tests are intended to examine various pretreatment options, the carbonation solution characteristics, as well as other mineral groups. Other/Unknown Material Carbonic acid SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) |
institution |
Open Polar |
collection |
SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) |
op_collection_id |
ftosti |
language |
unknown |
topic |
36 MATERIALS SCIENCE 58 GEOSCIENCES 37 INORGANIC ORGANIC PHYSICAL AND ANALYTICAL CHEMISTRY ACID CARBONATES AMBIENT TEMPERATURE CARBON DIOXIDE CARBONATES CARBONIC ACID CATIONS GREENHOUSE GASES KINETICS MAGNESIUM SILICATES OLIVINE PARTIAL PRESSURE REACTION KINETICS SERPENTINE STIRRING STORAGE |
spellingShingle |
36 MATERIALS SCIENCE 58 GEOSCIENCES 37 INORGANIC ORGANIC PHYSICAL AND ANALYTICAL CHEMISTRY ACID CARBONATES AMBIENT TEMPERATURE CARBON DIOXIDE CARBONATES CARBONIC ACID CATIONS GREENHOUSE GASES KINETICS MAGNESIUM SILICATES OLIVINE PARTIAL PRESSURE REACTION KINETICS SERPENTINE STIRRING STORAGE O'Connor, William K. Dahlin, David C. Nilsen, David N. Rush, G.E. Walters, Richard P. Turner, Paul C. CO2 storage in solid form: a study of direct mineral carbonation |
topic_facet |
36 MATERIALS SCIENCE 58 GEOSCIENCES 37 INORGANIC ORGANIC PHYSICAL AND ANALYTICAL CHEMISTRY ACID CARBONATES AMBIENT TEMPERATURE CARBON DIOXIDE CARBONATES CARBONIC ACID CATIONS GREENHOUSE GASES KINETICS MAGNESIUM SILICATES OLIVINE PARTIAL PRESSURE REACTION KINETICS SERPENTINE STIRRING STORAGE |
description |
Direct mineral carbonation by an ex-situ process in an aqueous system has been investigated over the past two years. The process utilizes a slurry of water mixed with a magnesium silicate mineral, such as olivine [forsterite end member (Mg2SiO4)], or serpentine [Mg3Si2O5(OH)4]. This slurry is reacted with sub- or supercritical carbon dioxide (CO2) to produce magnesite (MgCO3). The CO2 is dissolved in water to form carbonic acid (H2CO3), which dissociates to H+ and HCO3-. The H+ ion hydrolyzes the mineral, liberating Mg2+ cations which react with the bicarbonate to form the solid carbonate. Results of the baseline tests, conducted on ground products of the natural minerals, have demonstrated that the kinetics of the reaction are slow at ambient temperature (22 C) and subcritical CO2 pressures (below 73 atm). However, at elevated temperature and pressure, coupled with continuous stirring of the slurry and gas dispersion within the water column, significant conversion to the carbonate occurs. Extent of reaction is roughly 90% within 24 hours, at 185 C and partial pressure of CO2 (PCO2) of 115 atm. Heat pretreatment of the serpentine, coupled with bicarbonate and salt additions to the solution, improve reaction kinetics, resulting in an extent of reaction of roughly 80% within 0.5 hours, at 155 C and PCO2 of 185 atm. Subsequent tests are intended to examine various pretreatment options, the carbonation solution characteristics, as well as other mineral groups. |
author |
O'Connor, William K. Dahlin, David C. Nilsen, David N. Rush, G.E. Walters, Richard P. Turner, Paul C. |
author_facet |
O'Connor, William K. Dahlin, David C. Nilsen, David N. Rush, G.E. Walters, Richard P. Turner, Paul C. |
author_sort |
O'Connor, William K. |
title |
CO2 storage in solid form: a study of direct mineral carbonation |
title_short |
CO2 storage in solid form: a study of direct mineral carbonation |
title_full |
CO2 storage in solid form: a study of direct mineral carbonation |
title_fullStr |
CO2 storage in solid form: a study of direct mineral carbonation |
title_full_unstemmed |
CO2 storage in solid form: a study of direct mineral carbonation |
title_sort |
co2 storage in solid form: a study of direct mineral carbonation |
publishDate |
2008 |
url |
http://www.osti.gov/servlets/purl/896225 https://www.osti.gov/biblio/896225 |
genre |
Carbonic acid |
genre_facet |
Carbonic acid |
op_relation |
http://www.osti.gov/servlets/purl/896225 https://www.osti.gov/biblio/896225 |
_version_ |
1772813788828925952 |