Kiruna mineral processing starts underground — Bulk sorting by LIF

The iron ores of the Kiruna mine in Sweden are of exceptional quality except for the phosphorus content in certain zones of the orebody. The prevention of mixing ores high in phosphorus with those low in phosphorus has always been of significant economic importance. The ongoing introduction of tele-mining and automatic haulage by LHDs requires new means in the field of quality control underground, as the experienced miner as well as the underground laboratory assistant no longer are involved in the process. As of 1998, LKAB has been testing prototypes of LIF (laser-induced fluorescence) analyzers for non-contact and real-time measurement of the phosphorus content of ore being transported by LHDs from the stopes to the respective ore pass assigned to a certain ore quality. The principles of the analysis of laser-induced fluorescence, the different test phases and results are described and conclusions made. With bulk sorting of ore underground, the mining engineer supports the efforts of the metallurgist in the processing plant.
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Summary: Gas dispersion in flotation defines the efficiency of the process once the chemistry has been established. There are three measurements, superficial gas velocity, gas holdup, and bubble size, which along with the derived quantity bubble surface area flux, are used to define “gas dispersion.” Sensors for measuring gas dispersion in industrial machines have been developed. This communication describes the working principle of the techniques and illustrates their potential to detect problems and...
Publication: CIM Bulletin
Author(s): C.O. Gomez, J.A. Finch
Issue: 1066
Volume: 95
Year: 2002
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Summary: Predicting the effect of wear can lead to improved control strategies that can possibly minimize the risk of catastrophic failure due to wear while maximizing useable life. In the field of geological exploration, diamond drill rod wear illustrates just such a case. Wear conditions vary with geological formations and compositions. The objective of this paper is to determine a general relationship, based in theory and practice, that will approximate drill rod wear and therefore predict...
Publication: CIM Bulletin
Author(s): P. Radziszewski, R. Laplante, P. De Ciccio
Issue: 1066
Volume: 95
Year: 2002
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Summary: Aggregation, i.e., the tendency of particles to cluster, can be expected to influence flotation selectivity. In this paper, a method of measuring aggregation is introduced and used to conduct plant surveys. Aggregation is measured using settling rate and turbidity converted to an aggregation index (AI) where 0 corresponds to most dispersed and 1 to most aggregated over the range of conditions tested, normally pH. Surveys of Cu and Zn flotation stages at four concentrators showed the AI...
Publication: CIM Bulletin
Author(s): E. El-Ammouri, M. Mirnezami, D. Lascelles, J.A. Finch
Issue: 1066
Volume: 95
Year: 2002
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Summary: Assessment of opportunities to improve mineral processing performance in existing concentrators and in describing undeveloped orebodies is key to improving the business case of a mining company. This assessment has traditionally been performed using the distinct and separate inputs from mineral processing and mineral science. More recently, process mineralogy has been used to integrate these two disciplines. This trend has been driven by the need to develop and process more challenging ore...
Publication: CIM Bulletin
Author(s): N.O. Lotter, P.J. Whittaker, L. Kormos, J.S. Stickling, G.J. Wilkie
Issue: 1066
Volume: 95
Year: 2002
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