Why optical sorting?
Limestone is, as is well known, a natural product, and is thus subject to certain fluctuations in its quality and colour. Contamination with other minerals and loam at the higher quarrying levels, and also in fissures of the quarries, must also be taken into account.
Actual conversion of limestone preparation was performed during a scheduled shutdown of only six weeks’ duration. This was necessary in order to be able at all to integrate the machines into the existing process. To “core” the old system, six large scrap containers were filled during this period,...