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Author: Admin | 2025-04-28
The calorific value of lignite and provide environmental benefits. The study was carried out on a specific example, namely for lignite in Gurha block in Bikaner, Rajasthan. The main objective of lignite separation is to reduce ashes, sulphur and other mineral impurities in lignite to increase its calorific value and provide environmental benefits. The results of the analysis show that the most effective method for removing unwanted compounds/substances from lignite is separation through dense media using cumene and carbon tetrachloride, treating it in the size range from -10 mm to +4.75 mm. With this method, the calorific value of the lignite fuel can be significantly increased and the negative impact on the environment can be minimised.Kermer et al. [58]Analysis of the possibility of using by-products of lignite combustion as a source of various metals in industrial demand.Kermer et al. [58] point out that the by-products of lignite combustion can be a potential source of many metals sought after by industry. Indeed, lignite combustion ash contains strategic metals, metalloids and rare earth elements (REEs). The study by Kermer et al. [58] seems to be very valuable as the authors have assessed the possibility of using this potential raw material for industrial purposes. The authors point out that such valuable pyrolytes, which are a source of metals sought after in industry, can be extracted in Germany in the Lausitz region. Furthermore, Kermer et al. [58] point out specific methods for the enrichment, separation and mobilisation of valuable materials from lignite ash. These methods include mechanical and thermal treatment as well as chemical and biological leaching. In thermally treated ashes, high extraction of metals such as Al, Ca, Fe, and Mg was achieved. Biological leaching with acidophilic microorganisms metabolising Fe/S (MO) and heterotrophic MO resulted in the equally high mobilisation of metals, e.g., for Al, Ca, Fe, Mg, Mn, V, Zn, Zr and for some REE. The authors’ results indicate that the stabilised ash has good parameters and can be used e.g., as an additive in cement and concrete production.Singh and Singh [87]A study of the potential for improving the calorific value of
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