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Sorting of Disseminated Sulphide Ore by X-Ray Transmission and Electromagnetic Sensors

Sensor-based sorting of sulphide ores has been under investigation since the 1950s where sorters worked with metal detectors and channelised feed streams to detect massive lumps of sulphides, which were rejected by mechanical flaps. Today, sorters with metal detectors are able to detect and reject massive sulphide ores at high throughput rates. They work in random feed mode where the material is fed randomly across the full working width of either chute or belt sorters. Nonetheless, currently available sensors are not sensitive enough to measure the metal contents of finely disseminated sulphide ores.

Since the run-of-mine from most sulphide ore deposits has a huge percentage of low grade disseminated ore with grades below 1%, sensors or combinations thereof have to be found that are able to discriminate between low grade ore and waste rock. This cut-off has to be made in a range between 0.1 and 0.3 % metal content in the case of, for example, nickel sulphides and cannot be achieved by conventional sorting methods like density separation or currently available metal sensors. Research was done at the Department of Mineral Processing (AMR) at RWTH Aachen University to determine the behaviour of the most currently available sensors with regard to the measurement of the sulphide grade of finely disseminated ores. To gain an understanding of the fundamentals involved in the measurements of a metal and an x-ray sensor, a set of artificial sulphide ore samples was produced, comprising a matrix of six different metal grades and six different sulphide particle size distributions. Each sample was measured with both sensors and the results were put into correlation with the metal grade and sulphide particle size.

Copyright:	© ANTS - Institut für anthropogene Stoffkreisläufe an der RWTH Aachen
Quelle:	SBSC 2006 (Juni 2006)
Seiten:	8
Preis:	€ 4,00
Autor:	Univ.-Prof. Dr.- Ing. Hermann Wotruba Dipl.- Ing. Fabian Riedel
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