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Sulphur is one of the major constituents of lignite. In addition, it is used to measure the negative environmental impacts of this raw material. The presented study included field work and laboratory work. Field work was aimed at collecting coal samples, which were subjected to a series of laboratory tests. In total, about 150 coal samples were collected and used for proximate analysis. In addition, a large database of archival results from mines and scientific literature was collected. Overall, more than 4000 coa...

All the elements in the periodic table from polonium to uranium belong to the group of radioactive elements. Additionally, potassium isotopes (40 K) should also be included to the mentioned group. A number of studies have shown that coal has a moderate ability to concentrate radioactive elements, but this problem becomes more important in the case of coal ash, where the accumulation of these elements takes place. This is associated with the low volatility of uranium and thorium, of which only a small amount is rel...