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Force and Energy Measurement of Bubble-Particle Detachment

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dc.contributor.authorSchimann, Hubert C. R.en
dc.contributor.committeechairYoon, Roe-Hoanen
dc.contributor.committeememberLuttrell, Gerald H.en
dc.contributor.committeememberNovak, Thomasen
dc.contributor.committeememberAdel, Gregory T.en
dc.contributor.departmentMining and Minerals Engineeringen
dc.date.accessioned2011-08-06T16:01:40Zen
dc.date.adate2004-06-15en
dc.date.available2011-08-06T16:01:40Zen
dc.date.issued2004-05-10en
dc.date.rdate2004-06-15en
dc.date.sdate2004-06-04en
dc.description.abstractPossibilities for increasing the upper limit of floatable particle sizs in the froth flotation process have been examined since the early beginnings of mineral flotation. The economic implications of such an incresae are far ranging; from decreased grinding costs and increased recoveries to simplified flow-sheet design and increased throughput, all leading to increased revenue. Bubble-particle detachment has been studied to better understand the factors influencing the strength of attachment and the energies involved. Direct measurements of bubble particle detachment were performed using a hanging balance apparatus (KSV Sigma 70 tensiometer) and using a submerged hydrophobic plate in water. Three experiments were used; direct force measurement of bubble-particle detachment, detachment force and energy of a bubble from a submerged hydrophobic plate, and detachment force and energy of a cetyltrimethylammonium bromide coated silica sphere from a flat bubble. Octadecyltrichlorosilane was used as a hydrophobic coating in the first two experimental methods. These experiments were recorded with a CCD camera to identify the detachment processes involved. Energies for both methods were calculated and divided into the two main steps of the detachment process: Three-Phase-Contact pinning and three phase contact line sliding. The first step represents the energy barrier which must be overcome before detachment can begin. It is directly related to contact angle hysteresis. Detachment occurs during the second step, where the solid-vapor interface is replaced by solid-liquid and liquid-vapor. This step corresponds to the work of adhesion. The effects of surface tension, contact angle and hysteresis were well demonstrated with the three experimental methods. Good correlation was found between theoretical work of adhesion and measured energies.en
dc.description.degreeMaster of Scienceen
dc.format.mediumETDen
dc.identifier.otheretd-06042004-121921en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-06042004-121921en
dc.identifier.urihttp://hdl.handle.net/10919/9963en
dc.publisherVirginia Techen
dc.relation.haspartThesis_ETD.pdfen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectcontact angle hysteresisen
dc.subjectbubble-particle detachmenten
dc.subjectoctadecyltrichlorosilaneen
dc.subjectcetyltrimethylammonium bromideen
dc.subjectcoarse particle flotationen
dc.titleForce and Energy Measurement of Bubble-Particle Detachmenten
dc.typeThesisen
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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