An evaluation of factors affecting the robustness of colour measurement and its potential to predict the grade of flotation concentrate

Reddicka, J. F., Hesketh, A. H., Morara, S. H. and Bradshaw, D. J. (2009) An evaluation of factors affecting the robustness of colour measurement and its potential to predict the grade of flotation concentrate. Minerals Engineering, 22 1: 64-69. doi:10.1016/j.mineng.2008.03.018


Author Reddicka, J. F.
Hesketh, A. H.
Morara, S. H.
Bradshaw, D. J.
Title An evaluation of factors affecting the robustness of colour measurement and its potential to predict the grade of flotation concentrate
Journal name Minerals Engineering   Check publisher's open access policy
ISSN 0892-6875
Publication date 2009-01
Sub-type Article (original research)
DOI 10.1016/j.mineng.2008.03.018
Volume 22
Issue 1
Start page 64
End page 69
Total pages 6
Place of publication United Kingdom
Publisher Elsevier
Language eng
Subject 09 Engineering
Abstract Recent developments in machine vision, applied to froth flotation, show the potential for the use of the measurement of froth surface descriptors to provide an improvement to the operation of flotation cells and banks. One such descriptor, froth colour, has been traditionally assumed to relate to the grade of the concentrate recovered. This work sets out to test this assumption, and was performed using a machine vision system, SmartFroth. This system included a camera hood with built in LED lighting, a colour calibration patch and a CIE ‘Lab’ colour space conversion algorithm, which all served to reduce the effect of ambient lighting on the colour measurements. The effectiveness of these techniques was evaluated by comparing colour measurements of dry synthetic ore under various lighting conditions. It was found that the influence of ambient lighting had not been completely eliminated. Batch flotation tests were conducted on a sulphide ore, from the Kennecott Utah Copperton Concentrator, and established that froth colour does not account for entrained gangue, which is barely visible on the froth surface. Thus, froth colour alone cannot be used to accurately predict concentrate grade.
Keyword On-line analysis
Process control
Sulphide ores
Froth flotation
Q-Index Code C1
Q-Index Status Provisional Code

Document type: Journal Article
Sub-type: Article (original research)
Collection: Julius Kruttschnitt Mineral Research Centre Publications
 
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Created: Wed, 22 Sep 2010, 14:38:10 EST by Laura McTaggart on behalf of Sustainable Minerals Institute