The aim of the study was to investigate the possibility of a partial upgrade of the existing technological line at the company Calumite s.r.o., intended for the treatment of blast furnace slag for its secondary use. The first step was detailed characterization of the materials by means of mechanical-physical parameters, among which are, for example, the particle size distribution, compressibility, and the angle of internal and external friction. In the next step, the method of magnetic separation was used to reduce the content of magnetic components in the samples, due to the potential of slag to also be used in the production of clear glass, among other types of use. Subsequently, it was examined how the original mechanical-physical characteristics of the measured samples have changed.The results suggest that the added magnetic separation operations allow us to declare the Fe content in the non-magnetic parts of the product below the 0.1% limit. There was; however, slightly less effective separation of the material. After the above-mentioned material treatment, we succeeded in both cases in reducing the wall friction and increasing compressibility of the product, whereas the angle of internal friction and flow-ability remained with unchanged modes. Therefore, in terms of economic considerations, the introduction of an additional operation with magnetic separation for the treatment of blast furnace slag on the technological line can be assessed as a suitable innovation, and the secondary product can be used for the production of clear glass.Keywords: slag, calumite, magnetic separation, internal and external angle, compressibility
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