Characterization and scale-up of microbubble generation in column flotation

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dc.contributor.authorDavis, Van Leslieen
dc.contributor.committeechairLuttrell, Gerald H.en
dc.contributor.committeememberYoon, Roe-Hoanen
dc.contributor.committeememberKarmis, Michael E.en
dc.contributor.committeememberAdel, Gregory T.en
dc.contributor.departmentMining and Minerals Engineeringen
dc.date.accessioned2014-03-14T21:32:16Zen
dc.date.adate2009-03-24en
dc.date.available2014-03-14T21:32:16Zen
dc.date.issued1990-04-05en
dc.date.rdate2009-03-24en
dc.date.sdate2009-03-24en
dc.description.abstractRecent hydrodynamic studies suggest that small air bubbles can be used to improve the performance of column flotation. Tests carried out at Virginia Tech during the past several years have shown that various types of inline motionless (or static) mixers can successfully produce microbubbles for column flotation. Unfortunately, few guidelines exist for selecting the proper size and type of motionless mixer for generating microbubbles. In the present work, the mean bubble size produced by various types of in-line motionless mixers has been experimentally determined over a wide range of operating conditions and generator geometries. Test results indicate that generator performance is described by a series of expressions derived from a dimensional analysis. These expressions demonstrate that bubble diameter is primarily determined by the generator geometry and a dimensionless term known as the Weber number. Tests have also been conducted to determine the reduction in the performance of centrifugal pumps under air admitting conditions. A semi-empirical pump model has been utilized which allows the proper size of pump to be selected for microbubble generation. This information should prove useful for the design and operation of microbubble generation circuits on an industrial scale.en
dc.description.degreeMaster of Scienceen
dc.format.extentxii, 156 leavesen
dc.format.mediumBTDen
dc.format.mimetypeapplication/pdfen
dc.identifier.otheretd-03242009-040658en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-03242009-040658/en
dc.identifier.urihttp://hdl.handle.net/10919/41766en
dc.language.isoenen
dc.publisherVirginia Techen
dc.relation.haspartLD5655.V855_1990.D384.pdfen
dc.relation.isformatofOCLC# 22337204en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subject.lccLD5655.V855 1990.D384en
dc.subject.lcshCoal preparationen
dc.subject.lcshCoal washingen
dc.titleCharacterization and scale-up of microbubble generation in column flotationen
dc.typeThesisen
dc.type.dcmitypeTexten
thesis.degree.disciplineMining and Minerals Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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