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Talc Sorting

Talc is a mineral that is commonly used in the production of many industrial products. For instance, talc is present in cosmetics, paper, plastic, paint and coatings, rubber, food, electric cables, pharmaceuticals and ceramics, to name a few. A source of talc is the mineral soapstone or steatite, which has a high abundance of talc and is white, or sometimes coarse greyish-green, in appearance.

Challenge: Distinction between Talc and Gangue

The optical color similarities, between white talc and white gangue in the rock ore, makes the task of distinguishing and sorting very hard to accomplish.

Solution: Hyperspectral Imaging for Talc Sorting

EVK HELIOS hyperspectral cameras detect the spectral differences of materials and can thus classify rocks based on their chemical composition. This allows EVK systems to be used in areas where conventional color cameras reach their limits and enables the differentiation of two similar looking rocks such as white talc and white gangue. The detection is performed directly in line and in real time for an efficient and optimized extraction process.


Hyperspectral Imaging offers the degree of classification accuracy required for applications in the mining industry by directly measuring chemical molecular composition through the absorption of light (spectroscopy).

EVK’s portfolio of sensor-based technology includes hyperspectral cameras and inductive sensor systems that can be used individually or combined with a color camera with sensor fusion to create a high-performance sorting application.

More Info at
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Other applications in the industry

[evk-related-usecases branche=mining slug=talc-sorting

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