Brown Coal Bulletin, 2023 (vol. 63), issue 1
Estimation of the uncertainty of the gravimetric determination of the mass concentration of suspended PM10 particles
Ing. David Hirman
Zpravodaj Hnědé uhlí 2023, 63(1)
Two sequential sampling systems SEQ47/50 Sven Leckel Ingenieurbüro GmbH are used for quality checks of the continuous determination of the mass concentration of suspended particles in the measuring network of the Brown Coal Research Institute, Inc. (hereinafter VúHU as). In 2022, a long-term verification of the quality of measurements by these systems was carried out. The results of the determination of uncertainty for the measurement of PM10 particles were in accordance with the requirements of Decree No. 330/2012 Coll., on the method of evaluating the level of pollution, the extent of informing the public about the level of pollution and in smog...
Extraction of the Coarse Screening Plant - replacement of technology
Ing. David Hirman, Ing. Vladimír Herškovič
Zpravodaj Hnědé uhlí 2023, 63(1)
The article describes the change of technology intended for the disposal of coal dust at the Coarse Screening Plant in the Coal Treatment operational section at Severočeské doly a.s., caused by the need to respond to the change in the emission limit of Decree No. 415/2012 Coll. This concerns the replacement of four pieces of wet surface separators for four modern extraction units, the replacement of which took place in two stages. The pipeline routes and suction points were reconstructed. In connection with the change in the method of disposal of coal dust, the structure of the belt conveyor for the disposal of the wet mixture was also modified. Furthermore,...
Extraction of Ti and Ga from Coal Combustion by-products by combined chlorination-cement method
Ing. Tomáš Frýdl, Ing. Hong Nguyen Vu, Ph.D.
Zpravodaj Hnědé uhlí 2023, 63(1)
Globally, around 1 200 Mt of coal combustion by-products (CCBs) are produced by burning coal each year. They are currently considered as waste materials and are often landfilled, leading to many environmental problems. In addition to the dominant alumo-silicate matrix, they contain relatively high amounts of rare earth elements (REE) and other valuable metals, which is why they are increasingly thought of as a material for use in construction industry and as a source of valuable metals. A potentially waste-free combined roasting method, consisting of heat treatment of a mixture of CCBs, CaCO3 and CaCl2, provides a potential link between the two directions...