Susceptibility of Granite Rock to scCO2/Water at 200 degrees C and 250 degrees C
Granite rock comprising anorthoclase-type albite and quartz as its major phases and biotite mica as the minor one was exposed to supercritical carbon dioxide (scCO{sub 2})/water at 250 C and 13.78 MPa pressure for 104 hours. For comparison purpose, four other rocks, albite, hornblende, diorite, and...
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Brookhaven National Laboratory
2011
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ftunivnotexas:info:ark/67531/metadc836278 2023-05-15T15:52:45+02:00 Susceptibility of Granite Rock to scCO2/Water at 200 degrees C and 250 degrees C Sugama, T. Gill, S., Ecker, L., Butcher, T., Warren, J. DOE - OFFICE OF GEOTHERMAL TECHNOLOGIES 2011-01-01 Text http://digital.library.unt.edu/ark:/67531/metadc836278/ English eng Brookhaven National Laboratory rep-no: BNL--94638-2011 grantno: DE-AC02-98CH10886 osti: 1033189 http://digital.library.unt.edu/ark:/67531/metadc836278/ ark: ark:/67531/metadc836278 Granites Quartz Potassium Hydrofluoric Acid Granite Rock Kaolinite Supercritical Carbon Dioxide 15 Geothermal Energy Carbonates Siderite Mica Feldspars Carbonic Acid Biotite Aluminium Geothermal System Microstructure By-Products Silicon Supercritical Carbon Dioxide Carbon Dioxide Diorites Hornblende Calcite Leaching Report 2011 ftunivnotexas 2016-07-23T22:11:12Z Granite rock comprising anorthoclase-type albite and quartz as its major phases and biotite mica as the minor one was exposed to supercritical carbon dioxide (scCO{sub 2})/water at 250 C and 13.78 MPa pressure for 104 hours. For comparison purpose, four other rocks, albite, hornblende, diorite, and quartz, also were exposed. During the exposure of granite, ionic carbonic acid, known as the wet carbonation reactant, preferentially reacted with anorthoclase-type albite and biotite, rather than with quartz. The susceptibility of biotite to wet carbonation was higher than that of anorthoclase-type albite. All the carbonation by-products of anorthoclase-type albite were amorphous phases including Na- and K-carbonates, a kaolinite clay-like compound, and silicon dioxide, while wet carbonation converted biotite into potassium aluminum silicate, siderite, and magnesite in crystalline phases and hydrogen fluoride (HF). Three of these reaction by-products, Na- and K-carbonates and HF, were highly soluble in water. Correspondingly, the carbonated top surface layer, about 1.27 mm thick as carbonation depth, developed porous microstructure with numerous large voids, some of which have a size of {>=} 10 {mu}m, reflecting the erosion of granite by the leaching of these water-soluble reaction by-products. Comparing with this carbonation depth, its depth of other minerals was considerable lower, particularly, for hornblende and diorite with 0.07 and 0.02 mm, while no carbonate compound was detected in quartz. The major factor governing these low carbonation depths in these rocks was the formation of water-insensitive scale-like carbonate by-products such as calcite (CaCO{sub 3}), siderite (FeCO{sub 3}), and magnesite (MgCO{sub 3}). Their formation within the superficial layer of these minerals served as protective barrier layer that inhibits and retards further carbonation of fresh underlying minerals, even if the exposure time was extended. Thus, the coverage by this barrier layer of the non-carbonated surfaces of the underlying rock was reason why the hornblende and diorite exhibited a minimum depth of carbonation. Under exposure to the scCO{sub 2}/water at 200 C and 10.34 MPa pressure for up to 42 days, the ranking of the magnitude of erosion caused by wet carbonation was in the following order; granite > albite > hornblende > diorite > quartz. The eroding-caused weight loss of granite (0.88 %) was {approx}2.4, {approx}5.2, {approx}9.8, and {approx}17.6 times greater than that of albite, hornblends, diorite, and quartz, respectively. Report Carbonic acid University of North Texas: UNT Digital Library |
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Open Polar |
collection |
University of North Texas: UNT Digital Library |
op_collection_id |
ftunivnotexas |
language |
English |
topic |
Granites Quartz Potassium Hydrofluoric Acid Granite Rock Kaolinite Supercritical Carbon Dioxide 15 Geothermal Energy Carbonates Siderite Mica Feldspars Carbonic Acid Biotite Aluminium Geothermal System Microstructure By-Products Silicon Supercritical Carbon Dioxide Carbon Dioxide Diorites Hornblende Calcite Leaching |
spellingShingle |
Granites Quartz Potassium Hydrofluoric Acid Granite Rock Kaolinite Supercritical Carbon Dioxide 15 Geothermal Energy Carbonates Siderite Mica Feldspars Carbonic Acid Biotite Aluminium Geothermal System Microstructure By-Products Silicon Supercritical Carbon Dioxide Carbon Dioxide Diorites Hornblende Calcite Leaching Sugama, T. Gill, S., Ecker, L., Butcher, T., Warren, J. Susceptibility of Granite Rock to scCO2/Water at 200 degrees C and 250 degrees C |
topic_facet |
Granites Quartz Potassium Hydrofluoric Acid Granite Rock Kaolinite Supercritical Carbon Dioxide 15 Geothermal Energy Carbonates Siderite Mica Feldspars Carbonic Acid Biotite Aluminium Geothermal System Microstructure By-Products Silicon Supercritical Carbon Dioxide Carbon Dioxide Diorites Hornblende Calcite Leaching |
description |
Granite rock comprising anorthoclase-type albite and quartz as its major phases and biotite mica as the minor one was exposed to supercritical carbon dioxide (scCO{sub 2})/water at 250 C and 13.78 MPa pressure for 104 hours. For comparison purpose, four other rocks, albite, hornblende, diorite, and quartz, also were exposed. During the exposure of granite, ionic carbonic acid, known as the wet carbonation reactant, preferentially reacted with anorthoclase-type albite and biotite, rather than with quartz. The susceptibility of biotite to wet carbonation was higher than that of anorthoclase-type albite. All the carbonation by-products of anorthoclase-type albite were amorphous phases including Na- and K-carbonates, a kaolinite clay-like compound, and silicon dioxide, while wet carbonation converted biotite into potassium aluminum silicate, siderite, and magnesite in crystalline phases and hydrogen fluoride (HF). Three of these reaction by-products, Na- and K-carbonates and HF, were highly soluble in water. Correspondingly, the carbonated top surface layer, about 1.27 mm thick as carbonation depth, developed porous microstructure with numerous large voids, some of which have a size of {>=} 10 {mu}m, reflecting the erosion of granite by the leaching of these water-soluble reaction by-products. Comparing with this carbonation depth, its depth of other minerals was considerable lower, particularly, for hornblende and diorite with 0.07 and 0.02 mm, while no carbonate compound was detected in quartz. The major factor governing these low carbonation depths in these rocks was the formation of water-insensitive scale-like carbonate by-products such as calcite (CaCO{sub 3}), siderite (FeCO{sub 3}), and magnesite (MgCO{sub 3}). Their formation within the superficial layer of these minerals served as protective barrier layer that inhibits and retards further carbonation of fresh underlying minerals, even if the exposure time was extended. Thus, the coverage by this barrier layer of the non-carbonated surfaces of the underlying rock was reason why the hornblende and diorite exhibited a minimum depth of carbonation. Under exposure to the scCO{sub 2}/water at 200 C and 10.34 MPa pressure for up to 42 days, the ranking of the magnitude of erosion caused by wet carbonation was in the following order; granite > albite > hornblende > diorite > quartz. The eroding-caused weight loss of granite (0.88 %) was {approx}2.4, {approx}5.2, {approx}9.8, and {approx}17.6 times greater than that of albite, hornblends, diorite, and quartz, respectively. |
author2 |
DOE - OFFICE OF GEOTHERMAL TECHNOLOGIES |
format |
Report |
author |
Sugama, T. Gill, S., Ecker, L., Butcher, T., Warren, J. |
author_facet |
Sugama, T. Gill, S., Ecker, L., Butcher, T., Warren, J. |
author_sort |
Sugama, T. |
title |
Susceptibility of Granite Rock to scCO2/Water at 200 degrees C and 250 degrees C |
title_short |
Susceptibility of Granite Rock to scCO2/Water at 200 degrees C and 250 degrees C |
title_full |
Susceptibility of Granite Rock to scCO2/Water at 200 degrees C and 250 degrees C |
title_fullStr |
Susceptibility of Granite Rock to scCO2/Water at 200 degrees C and 250 degrees C |
title_full_unstemmed |
Susceptibility of Granite Rock to scCO2/Water at 200 degrees C and 250 degrees C |
title_sort |
susceptibility of granite rock to scco2/water at 200 degrees c and 250 degrees c |
publisher |
Brookhaven National Laboratory |
publishDate |
2011 |
url |
http://digital.library.unt.edu/ark:/67531/metadc836278/ |
genre |
Carbonic acid |
genre_facet |
Carbonic acid |
op_relation |
rep-no: BNL--94638-2011 grantno: DE-AC02-98CH10886 osti: 1033189 http://digital.library.unt.edu/ark:/67531/metadc836278/ ark: ark:/67531/metadc836278 |
_version_ |
1766387849856286720 |