Optical sorting for control of limestone quality
Summary: SCHAEFER KALK GmbH & Co. KG processes limestone from a number of ­different quarries in the kilns of its Steeden plant. Two optical sorting machines were ­officially ­commissioned at this plant in late 2011 to permit sustainable continued operation of the quarries and to ensure constant high quality in the particle fractions for burning.

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,...

Related articles:

Issue 2021-01-02 Make one out of two

C?onstruction waste is produced when civil engineering structures are demolished and during the deconstruction of buildings. Even if a building is selectively deconstructed, mixes of building...

Issue 2013-01-02

Sensor-based sorting systems available on the market today must demonstrate sufficient flexibility to permit their application in a wide range of conditions. Typical challenges for the sorting systems...

Issue 2012-07-08

Dear Readers   Limestone is one of the most important raw materials for the building materials industry. From p. 83 you will be informed about the possibilities offered by the sensitive optical...

Issue 2021-05 Tests on a freefall sorter

1? Sorting systems in the recycling economy Concomitant with the rapid development of computer technology and significant advances in sensor engineering, the development of sensor-supported sorting...

Issue 2023-05 Energy-efficient ejection module

TOMRA Mining has launched a new ejection module for its proven COM Tertiary XRT sorter specifically developed for sorting small particle sizes. The COM Tertiary XRT Fines sorter, featuring the new...