Možnosti recyklace jemnozrnných hutnických odpadů

Abstract

Thesis deals with the topic of choice and characterization of applicable binders in the industrial manufacture of briquettes with suitable mechanical properties. At the same time, it is focused on the effect of the amount of the selected binders in the briquettes (Unipret starch, Portland cement) on the iron oxides reduction in the waste materials under study – blast furnace sludge and converter sludge – depending on retention time during the thermal treatment in laboratory (900, 1000, 1100 °C). Moreover, study was conducted on the effect of the binder on the volume and composition of the waste gas originating during the thermal treatment as well as the possible impact of this gas on the environment. In order to find the relationships in the data, the data were assessed using multivariate analyses. Conducted experiments proved relationship between the degree of iron oxide to metal iron conversion and the amount of the binder as well as the retention temperature. The presence of the binder influenced the amount of the produced waste gas as well. Factorial analysis on mixed data proved that the observed concentrations of the hydrocarbons (methane, ethane, ethene, propane, propene, butane, isobutane, isobutene, buta-1,3-diene) are positively correlated with each other (all apart from ethyne) and that the concentration of the hydrocarbons and hydrogen are in close association with the applied binder. On the other hand, observed concentrations of ethyne, carbon dioxide and carbon monoxide were not influenced by the binder used. FAMD did not prove any direct effect of the chosen final temperature of the thermal treatment on the amount of the produced hydrocarbons, hydrogen, carbon dioxide and carbon monoxide. The effect of the choice of the binder on the amount of PAHs was also observed.