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Flottasie van 'n growwe pirieterts in 'n luggeborrelde hidrosikloon
Thesis (MScEng) -- Stellenbosch University, 1986
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| Format: | Thesis |
| Language: | Afrikaans |
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Stellenbosch : Stellenbosch University
2012
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| _version_ | 1867613956141481984 |
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| access_status_str | Open Access |
| author | Burger, Andries Jacobus |
| author2 | Van Deventer, J. S. J. |
| author_browse | Burger, Andries Jacobus Van Deventer, J. S. J. |
| author_facet | Van Deventer, J. S. J. Burger, Andries Jacobus |
| author_sort | Burger, Andries Jacobus |
| collection | Thesis |
| dc_rights_str_mv | Stellenbosch University |
| description | Thesis (MScEng) -- Stellenbosch University, 1986 |
| format | Thesis |
| id | oai:scholar.sun.ac.za:10019.1/19741 |
| institution | Stellenbosch University (South Africa) |
| language | Afrikaans |
| last_indexed | 2026-06-10T12:44:22.712Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from SUNScholar — Stellenbosch University Repository |
| publishDate | 2012 |
| publishDateRange | 2012 |
| publishDateSort | 2012 |
| publisher | Stellenbosch : Stellenbosch University |
| publisherStr | Stellenbosch : Stellenbosch University |
| record_format | dspace |
| source_str | SUNScholar — Stellenbosch University Repository |
| spelling | oai:scholar.sun.ac.za:10019.1/19741 Flottasie van 'n growwe pirieterts in 'n luggeborrelde hidrosikloon Burger, Andries Jacobus Van Deventer, J. S. J. Cloete, F. L. D. University of Stellenbosch. Faculty of Engineering. Dept. of Process Engineering Hydrocyclones Flotation Ore Flotation of particles Pyrites Separators (Machines) Dissertations -- Process engineering Theses -- Process engineering Thesis (MScEng) -- Stellenbosch University, 1986 ENGLISH ABSTRACT: High turbulence, high shear forces and high centrifugal forces characterise the flow in hydrocyclones. These characteristics are employed advantageously in the air-sparged hydrocyclone so that a space time of only one second is necessary for effective flotation. Conventional flotation processes on the other hand require a few minutes. Flotation of pyrite from a coarse Witwatersrand ore (100% -300 micron; 92% +38 micron) produces a sulphur recovery of 90% with a sulphur grade of 40% in the concentrate when the content of solids of the slurry feed equals 10%. Higher recoveries up to 93% are possible when slurries with a higher content of solids (e.g. 30%) are used. However, the sulphur grade then decreases to about 35%. Flotation in a batch cell produces a recovery of sulphur of 95% with a sulphur grade of 40%, but in this case a flotation time of 5 minutes is required. A hydrocyclone with a diameter of 50 mm and a length of 410 mm produces optimum results at a slurry feed rate of 35 to 40 l/min and an air-flow rate of 200 l/min. An air-flow rate of about 150 l/min is adequate at slurry feed rates lower than 35 l/min. Flotation of particles finer than 38 micron is more successful at higher slurry feed rates. The optimum flotation of coarse particles (i.e. +106 micron) occurs at lower feed rates. The best flotation results are obtained in the size fraction between 38 and 75 micron, which produces a recovery and content of sulphur of 95% and 51% respectively. A collector concentrate of 160 g/ton, which is thrice the quantity used in conventional processes, is required. The best recoveries at slurry feed rates lower than 35 l/min are obtained when the frother concentrate is low (approximately 20 mg/l). A higher frother concentrate, i.e. between 50 to 60 mg/l, is required at higher feed rates. The air-sparged hydrocyclone may be used effectively for rougher flotation and especially for the flotation of ore finer than 150 micron. The use of a specially designed pedestal can minimize blockage of the underflow. Such a pedestal has been designed and tested successfully. MINTEK Masters 2012-02-14T06:55:23Z 2012-02-14T06:55:23Z 1986-12 Thesis http://hdl.handle.net/10019.1/19741 af Stellenbosch University 172 p. : ill. application/pdf Stellenbosch : Stellenbosch University |
| spellingShingle | Hydrocyclones Flotation Ore Flotation of particles Pyrites Separators (Machines) Dissertations -- Process engineering Theses -- Process engineering Burger, Andries Jacobus Flottasie van 'n growwe pirieterts in 'n luggeborrelde hidrosikloon |
| title | Flottasie van 'n growwe pirieterts in 'n luggeborrelde hidrosikloon |
| title_full | Flottasie van 'n growwe pirieterts in 'n luggeborrelde hidrosikloon |
| title_fullStr | Flottasie van 'n growwe pirieterts in 'n luggeborrelde hidrosikloon |
| title_full_unstemmed | Flottasie van 'n growwe pirieterts in 'n luggeborrelde hidrosikloon |
| title_short | Flottasie van 'n growwe pirieterts in 'n luggeborrelde hidrosikloon |
| title_sort | flottasie van n growwe pirieterts in n luggeborrelde hidrosikloon |
| topic | Hydrocyclones Flotation Ore Flotation of particles Pyrites Separators (Machines) Dissertations -- Process engineering Theses -- Process engineering |
| url | http://hdl.handle.net/10019.1/19741 |
| work_keys_str_mv | AT burgerandriesjacobus flottasievanngrowwepirietertsinnluggeborreldehidrosikloon |