Maybe NVA could contactNemaska
(NMX) in Quebec Canada about the sorting of ore, seeing they had trials done. From their tech report - Aug 09/19Two (2) technologies were targeted for sorting trials: surface
color differentiation sorting technology and X-ray transmission (“XRT”). XRT uses atomic density
difference separation technology.
Below the best results of the two (2) size fractions are discussed.
a. Ore Sorting on - 40 mm + 20 mm, Amphibole Removal
Using XRT, the accepted material white rocks recovery was 95.8%, with white rock at 98.7%
concentration. The photo in Figure 13.1 illustrates the visual results. There is very little
displaced material in the accepted stream.
Ore Sorting on - 20 mm + 9.5 mm, Amphibole Removal
Using XRT, the accepted material white rocks recovery was 96.8%, with white rock at 99.2%
concentration.
Steinert US was approached to test Nemaska Whabouchi ore with sensor-based sorting techniques
to beneficiate/upgrade the ore by removing waste rock consisting mainly of amphibolite. The test
sample provided consisted of pegmatite and dark amphibolite waste rocks.
The objective was test sorting efficiency of Steinert ore sorting equipment. The sorting sensor
selected was X-Ray Transmission or XRT. X-ray sensitive line-scan sensor provides high resolution
X-ray absorption images. An X-ray scintillation crystal sensor can capture up to 2,500 lines per
second.
Nemaska had prepared two (2) tonnes of sample. The sample was screened at 10 mm to remove
the fines which is not suitable for this sorting application. The first set of three tests were performed
on - 50mm + 15mm material. This size range is good ore sorter feed material, about ratio 1:3 sorting
size. The next three (3) tests were done on - 15mm + 10mm material. Finally, the last three (3) tests
were done on - 50 + 10mm size range, outside the ideal size ratio.
a. Ore Sorting on - 50 mm + 15 mm
The coarse sample - 50 mm + 15 mm yielded excellent results. Test #1 yielded the best result
at 99.4% separation efficiency of the white ore and was separated from the dark amphibolite.
The photos in Figure 13.2, illustrate the visual results. There is very little misplaced material
in the accepted and rejected streams.
b. Ore Sorting on - 15 mm + 10 mm
The finer sample - 15 mm + 10 mm was processed through the same equipment and also
produced very good results, but noticeably less than the coarse separation. The best
separation efficiency obtained was 96.7%.
c. Ore Sorting on - 50 mm + 10 mm
For the combined sample - 50 mm + 10 mm, the best separation efficiency obtained was
94.5%.....Just a thought..
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