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dc.contributor.advisorShadman, Farhangen_US
dc.contributor.authorMassieon, Charles Conrad, 1958-
dc.creatorMassieon, Charles Conrad, 1958-en_US
dc.date.accessioned2013-04-03T13:15:21Z
dc.date.available2013-04-03T13:15:21Z
dc.date.issued1992en_US
dc.identifier.urihttp://hdl.handle.net/10150/278173
dc.description.abstractThe kinetics and mechanism of the reduction of simulants of the iron-bearing lunar minerals olivine ((Fe,Mg)₂SiO₄), pyroxene ((Fe,Mg,Ca)SiO₃), and ilmenite (FeTiO₃) are investigated, extending previous work with ilmenite. Fayalite is reduced by H₂ at 1070 K to 1480 K. A layer of mixed silica glass and iron forms around an unreacted core. Reaction kinetics are influenced by permeation of hydrogen through this layer and a reaction step involving dissociated hydrogen. Reaction mechanisms are independent of Mg content. Augite, hypersthene and hedenbergite are reduced in H₂ at the same temperatures. The products are iron metal and lower iron silicates mixed throughout the mineral. Activation energy rises with calcium content. Ilmenite and fayalite are reduced with carbon deposited on partially reduced minerals via the CO disproportionation reaction. Reduction with carbon is rapid, showing the carbothermal reduction of lunar minerals is possible.
dc.language.isoen_USen_US
dc.publisherThe University of Arizona.en_US
dc.rightsCopyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.en_US
dc.subjectEngineering, Chemical.en_US
dc.titleReduction of iron-bearing lunar minerals for the production of oxygenen_US
dc.typetexten_US
dc.typeThesis-Reproduction (electronic)en_US
thesis.degree.grantorUniversity of Arizonaen_US
thesis.degree.levelmastersen_US
dc.identifier.proquest1349454en_US
thesis.degree.disciplineGraduate Collegeen_US
thesis.degree.nameM.S.en_US
dc.identifier.bibrecord.b27691214en_US
refterms.dateFOA2018-06-30T09:40:15Z
html.description.abstractThe kinetics and mechanism of the reduction of simulants of the iron-bearing lunar minerals olivine ((Fe,Mg)₂SiO₄), pyroxene ((Fe,Mg,Ca)SiO₃), and ilmenite (FeTiO₃) are investigated, extending previous work with ilmenite. Fayalite is reduced by H₂ at 1070 K to 1480 K. A layer of mixed silica glass and iron forms around an unreacted core. Reaction kinetics are influenced by permeation of hydrogen through this layer and a reaction step involving dissociated hydrogen. Reaction mechanisms are independent of Mg content. Augite, hypersthene and hedenbergite are reduced in H₂ at the same temperatures. The products are iron metal and lower iron silicates mixed throughout the mineral. Activation energy rises with calcium content. Ilmenite and fayalite are reduced with carbon deposited on partially reduced minerals via the CO disproportionation reaction. Reduction with carbon is rapid, showing the carbothermal reduction of lunar minerals is possible.


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