Preliminary investigations on the carbon dioxide sequestering potential of the ultramafic rock

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Fossil fuels continue to provide major sources of energy to the modern world even though global emissions of CO{sub 2} are presently at levels of 19 Gt/yr. Future antipollution measures may include sequestering of waste CO{sub 2} as magnesite (MgCO{sub 3}) by processing ultramafic rocks to obtain reactable Mg. Huge ultramafic deposits consisting of relatively pure Mg-rich silicates exist throughout much of the world in ophiolites and layered intrusions. Peridotites (especially dunites) and serpentinites comprise the best ores because they contain the most Mg by weight and are relatively reactive to hot acids such as HCl. Although mining such deposits ... continued below

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23 p.

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Goff, F.; Guthrie, G.; Counce, D.; Kluk, E.; Bergfeld, D. & Snow, M. August 1, 1997.

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Description

Fossil fuels continue to provide major sources of energy to the modern world even though global emissions of CO{sub 2} are presently at levels of 19 Gt/yr. Future antipollution measures may include sequestering of waste CO{sub 2} as magnesite (MgCO{sub 3}) by processing ultramafic rocks to obtain reactable Mg. Huge ultramafic deposits consisting of relatively pure Mg-rich silicates exist throughout much of the world in ophiolites and layered intrusions. Peridotites (especially dunites) and serpentinites comprise the best ores because they contain the most Mg by weight and are relatively reactive to hot acids such as HCl. Although mining such deposits on a large scale would have environmental impacts, the sequestering process could provide Cr, Ni, and other metals as byproducts and could dispose of existing waste (white) asbestos. Small ultramafic bodies ({approximately} 1 km{sup 3}) can potentially sequester about 1 Gt of CO{sub 2} or about 20% of annual US emissions. A single large deposit of dunite ({approximately} 30 km{sup 3}) could dispose of about 20 yr of current US CO{sub 2} emissions. The cost and environmental impact of mining these deposits must be weighed against the increased costs of energy and benefits to the atmosphere and climate.

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23 p.

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OSTI as DE98001882

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  • Other Information: PBD: Aug 1997

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  • Other: DE98001882
  • Report No.: LA--13328-MS
  • Grant Number: W-7405-ENG-36
  • DOI: 10.2172/563233 | External Link
  • Office of Scientific & Technical Information Report Number: 563233
  • Archival Resource Key: ark:/67531/metadc694767

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  • August 1, 1997

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  • Aug. 14, 2015, 8:43 a.m.

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  • Feb. 26, 2016, 3:28 p.m.

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Goff, F.; Guthrie, G.; Counce, D.; Kluk, E.; Bergfeld, D. & Snow, M. Preliminary investigations on the carbon dioxide sequestering potential of the ultramafic rock, report, August 1, 1997; New Mexico. (digital.library.unt.edu/ark:/67531/metadc694767/: accessed August 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.