Výzkum možností využití odprašků z aglomerace

Abstract

The submitted dissertation deals with the verification of technological possibilities for the material use of dust filters from baghouse filters (AL) and the last section of electrostatic precipitators (A) obtained from flue gas cleaning from the iron ore sintering process of Třinecké železárny. Sintering dust is currently deposited in landfills for hazardous waste with a negative impact on the environment or is processed in various facilities designed for this purpose. The composition of sintering dust changed after the introduction of BAT (baghouse filters) flue gas cleaning technology for PM10. Dust particles currently contain high amounts of halides (halite and sylvite) and have dangerous properties in terms of particle size and high conductivity. These properties have been described in detail. The use of dust particles after extraction with water and precipitation with suitable reagents seems to be one of the options for dealing with this type of waste in connection with the new Waste Act of the Czech Republic. Lead (Pb) is a major risk element that poses a significant problem in the further use of sintering dust. It has been found that the leachability of hazardous metals, especially Pb, increases dramatically in saturated sodium chloride solution. Despite the high alkaline pH, the metals are mobilized, leached, and thus cause a problem during the solidification. The work deals with the study of optimal conditions where Pb remains concentrated in the filter cake.