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The role of hydrocarbon oils in coal flotation : an investigation in to some pulp phase sub-processes
Bibliography: leaves 393-405.
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| Other Authors: | |
| Format: | Thesis |
| Language: | English |
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Department of Chemical Engineering
2014
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| _version_ | 1867613321077719040 |
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| access_status_str | Open Access |
| author | Anderson, Guy Victor Murie |
| author2 | Franzidis, Jean-Paul |
| author_browse | Anderson, Guy Victor Murie Franzidis, Jean-Paul |
| author_facet | Franzidis, Jean-Paul Anderson, Guy Victor Murie |
| author_sort | Anderson, Guy Victor Murie |
| collection | Thesis |
| description | Bibliography: leaves 393-405. |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/8377 |
| institution | University of Cape Town (South Africa) |
| language | eng |
| last_indexed | 2026-06-10T12:34:14.045Z |
| license_str | Not specified — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UCTD — University of Cape Town Open Access Repository |
| publishDate | 2014 |
| publishDateRange | 2014 |
| publishDateSort | 2014 |
| publisher | Department of Chemical Engineering |
| publisherStr | Department of Chemical Engineering |
| record_format | dspace |
| source_str | UCTD — University of Cape Town Open Access Repository |
| spelling | oai:open.uct.ac.za:11427/8377 The role of hydrocarbon oils in coal flotation : an investigation in to some pulp phase sub-processes Anderson, Guy Victor Murie Franzidis, Jean-Paul Chemical Engineering Bibliography: leaves 393-405. Oil dispersion, oil adsorption (including selectivity), and the influence of oil on bubble creation and attachment were studied, in an attempt to explain observed differences in flotation behaviour with -500 μm unbeneficiated bituminous coal. Collectors were synthesis grade and commercial stocks of aromatic and aliphatic oils; MIBC was the frother. Oil dispersions were analyzed using a Coulter Counter. All the oils were sufficiently dispersed for effective flotation, with aromatic oils being better dispersed. MIBC usually hindered oil dispersion. The kinetics and extent of oil adsorption onto solids were monitored with a specially developed technique. Aromatic oils adsorbed extensively (90 ) on the coal but aliphatic oils adsorbed far less. Nevertheless this was sufficient to render coal particles floatable. All the oils were highly selective. MIBC did not promote oil adsorption. Bubbles were electronically scaled and counted. Aromatic oils reduced bubble size markedly. Their spontaneous spreading at the air-water interface is associated with a net lowering of interfacial tensions. Aliphatic oils do not spread and consequently had little influence on bubble size. Bubble size is an important contributory factor to froth stability and oils which reduce sizes are better collectors. MIBC reduced bubble size (as expected): in combination with one commercial oil, sizes were reduced below those induced in the presence of either reagent in isolation. Coal recovery was largely dependent on froth stability since oil dispersion and adsorption was adequate. The mode of conditioning was important at low reagent dosages; as was the mode of reagent addition. Oils should be predispersed prior to addition to the pulp to facilitate their distribution. MIBC, which is preferentially oil-soluble should be added to the pulp separately and as late as possible to ensure maximum frothing activity. In the absence of extraneous surfactants, the pulp-phase behaviour of MIBC and oil is well understood and was invariably able to explain the observed flotation performance satisfactorily. Interfacial theory, which was reviewed in some detail, is currently inadequate for predictive purposes and empirical tests will remain necessary for the foreseeable future. 2014-10-11T12:15:46Z 2014-10-11T12:15:46Z 1988 Doctoral Thesis Doctoral PhD http://hdl.handle.net/11427/8377 eng application/pdf Department of Chemical Engineering Faculty of Engineering and the Built Environment University of Cape Town |
| spellingShingle | Chemical Engineering Anderson, Guy Victor Murie The role of hydrocarbon oils in coal flotation : an investigation in to some pulp phase sub-processes |
| thesis_degree_str | Doctoral |
| title | The role of hydrocarbon oils in coal flotation : an investigation in to some pulp phase sub-processes |
| title_full | The role of hydrocarbon oils in coal flotation : an investigation in to some pulp phase sub-processes |
| title_fullStr | The role of hydrocarbon oils in coal flotation : an investigation in to some pulp phase sub-processes |
| title_full_unstemmed | The role of hydrocarbon oils in coal flotation : an investigation in to some pulp phase sub-processes |
| title_short | The role of hydrocarbon oils in coal flotation : an investigation in to some pulp phase sub-processes |
| title_sort | role of hydrocarbon oils in coal flotation an investigation in to some pulp phase sub processes |
| topic | Chemical Engineering |
| url | http://hdl.handle.net/11427/8377 |
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