ORBi: Leroy Sophie - Optical analysis of particle size and chromite liberation from pulp samples of a UG2 ore regrinding circuit

Reference : Optical analysis of particle size and chromite liberation from pulp samples of a UG2 ore...


	Document type :	Scientific journals : Article
	Discipline(s) :	Engineering, computing & technology : Geological, petroleum & mining engineering
	To cite this reference:	http://hdl.handle.net/2268/99702

Title :	Optical analysis of particle size and chromite liberation from pulp samples of a UG2 ore regrinding circuit
Language :	English
Author, co-author :	Leroy, Sophie [Université de Liège - ULg > Département Argenco : Secteur GeMMe > Géoressources minérales & Imagerie géologique >]
	Dislaire, Godefroid [ > > ]
	Bastin, David [Université de Liège - ULg > Département Argenco : Secteur GeMMe > Génie minéral et recyclage >]
	Pirard, Eric [Université de Liège - ULg > Département Argenco : Secteur GeMMe > Géoressources minérales & Imagerie géologique >]
Publication date :	Oct-2011
Journal title :	Minerals Engineering
Publisher :	Pergamon Press - An Imprint of Elsevier Science
Volume :	24
Pages :	1340-1347
Peer reviewed :	Yes (verified by ORBi)
Audience :	International
ISSN :	0892-6875
City :	Oxford
Country :	United Kingdom
Keywords :	[en] Sizing ; Liberation analysis ; Particle morphology
Abstract :	[en] Since the early seventies high chromite and low base metal sulphide (BMS) contents of the UG2 reef imposes technological challenges to mineral processors and extractive metallurgists. Forty years later, particle size distribution and size by size mineralogy are considered as key factors to the continuous improvement of the UG-2 ore metallurgy. With the successful development of ultra fine grinding technologies, a compromise has to be found between fine grinding to achieve platinum group minerals liberation and to avoid the overgrinding of gangue minerals, especially chromite gangue which is detrimental in smelting process. Indeed, fine chromite grains, despite of being naturally hydrophobic mineral, can be recovered in flotation concentrate by entrainment. In addition, overgrinding also increase liberation of naturally floatable gangue (talc) which contaminate the concentrate and need to be controlled during flotation. In this paper, innovative techniques of single particle image analysis from both dry and wet samples have been tentatively used to assess the chromite particle size distribution and the chromite grade of samples taken from a secondary milling circuit. Preliminary results demonstrate excellent potential for online particle imaging making use of both the particle geometry (size, shape) and the optical properties (translucency).
Target :	Researchers
Permalink :	http://hdl.handle.net/2268/99702
DOI :	10.1016/j.mineng.2011.06.006

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