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@PHDTHESIS{Breuer:1015563,
author = {Breuer, Ben},
othercontributors = {Clausen, Elisabeth and Goldmann, Daniel},
title = {{D}etektierbarkeit von {W}ertträgern in geringen
{K}onzentrationen in polymetallischen {E}rzen im {H}inblick
auf eine sensorgestützte {S}ortierung am {B}eispiel eines
{K}assiteriterzes einer {S}karnerzlagerstätte},
school = {Rheinisch-Westfälische Technische Hochschule Aachen},
type = {Dissertation},
address = {Aachen},
publisher = {RWTH Aachen University},
reportid = {RWTH-2025-06443},
pages = {1 Online-Ressource : Illustrationen},
year = {2025},
note = {Veröffentlicht auf dem Publikationsserver der RWTH Aachen
University; Dissertation, Rheinisch-Westfälische Technische
Hochschule Aachen, 2025},
abstract = {In this research work, the detectability of value carriers
in low concentrations in polymetallic ores is investigated
with regard to sensor-based sorting (SBS) using the example
of a cassiterite ore from a skarn ore deposit. In this
polymetallic deposit, the value carrier tin is strongly
intergrown with iron-bearing minerals, among other metals.
The deposit has already been intensively explored, but never
commercially exploited. Sensor-based sorting could help to
compensate for the geological disadvantages that have so far
hindered the exploitation of this and similar deposits. Tin
is one important economic factor for digitalisation, due to
its use as a solder in the electrical industry. The EU is
almost entirely dependent on tin imports. The two largest
production areas in the world are in Asia and South America.
Given the sometimes faltering global trade and a
reassessment of supply security through global supply
chains, domestic deposits are becoming more attractive. The
technical applicability of SBS was tested on a German skarn
deposit, where existing exploration made it possible to
obtain samples in sufficient quantity by taking several
samples in different parts of the deposit. The objective of
the SBS was find a reasonable balance between reduce the
mass of the ore for subsequent beneficiation processes and
keeping as much value as possible. A comprehensive
geological investigation within the research project,
especially about the association of valuable mineral
Cassiterite and minerals of the host rock, formed the basis
to identify suitable sensor types for the present case (NIR
and XRT). In practical tests the effectiveness of the
potential sensor types could be analysed and compared. The
applicability of the prioritized sensor type XRT was
demonstrated by means of a sequential, multi-stage,
experimental setup. The final stage involved the realisation
of SBS in industrial scale, highlighting potential
optimization approaches. The most significant approach was
the utilisation of magnetic separation as rougher step and
the use of SBS as scavenger in the magnetic separation
tailings fraction. In order to investigate specific
individual parameters in detail, synthetic test specimens
with defined but realistic metal contents of iron, tin and
tungsten were manufactured. Based on the known metal
contents as well as the matrix composition, a reference
value for the attenuation of the X-ray transmission of the
test specimens could be established in order to enable the
comparability of different electronic data processing (EDP)
methods. The results of the different EDP procedures were
evaluated for strengths and weaknesses in order to work out
optimization approaches for future procedures. Both - the
variations of the results of the same specimen in multiple
exposures and variations of the results between different
specimen of as similar composition as possible - were
investigated. Furthermore, the entire width of the
composition was examined for a systematics of the
fluctuations. Another approach to the investigation of the
value fluctuations was the metal content of the test
specimens and to what extent the different metal components
influence the value fluctuation. No systematic pattern was
identified in the fluctuations and thus no correction factor
could be developed.},
cin = {513310 / 510000 / 513220 / 512320},
ddc = {620},
cid = {$I:(DE-82)513310_20180515$ / $I:(DE-82)510000_20140620$ /
$I:(DE-82)513220_20170101$ / $I:(DE-82)512320_20140620$},
pnm = {BMBF 033R128 - AFK - Aufbereitung feinkörniger,
polymetallischer Zinn-, Wolfram- und Indium-Komplexerze
(033R128)},
pid = {G:(BMBF)033R128},
typ = {PUB:(DE-HGF)11},
doi = {10.18154/RWTH-2025-06443},
url = {https://publications.rwth-aachen.de/record/1015563},
}
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