Flottasie van 'n growwe pirieterts in 'n luggeborrelde hidrosikloon

dc.contributor.advisorVan Deventer, J. S. J.
dc.contributor.advisorCloete, F. L. D.
dc.contributor.authorBurger, Andries Jacobus
dc.contributor.otherUniversity of Stellenbosch. Faculty of Engineering. Dept. of Process Engineeringen_ZA
dc.descriptionThesis (MScEng) -- Stellenbosch University, 1986en_ZA
dc.description.abstractENGLISH 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.en_ZA
dc.format.extent172 p. : ill.
dc.publisherStellenbosch : Stellenbosch Universityen_ZA
dc.subjectFlotation of particlesen_ZA
dc.subjectSeparators (Machines)en_ZA
dc.subjectDissertations -- Process engineeringen_ZA
dc.subjectTheses -- Process engineeringen_ZA
dc.titleFlottasie van 'n growwe pirieterts in 'n luggeborrelde hidrosikloonaf
dc.rights.holderStellenbosch Universityen_ZA

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