Abstract
Based on the analysis of the non-standard iron-bearing raw materials treatment process and the results of real composition measurements of the flue gas, the study of hazards by identification of harmful substances that occur in the accident, as well as the modeling of the system of protection against air-pollution due to the cancellation of work the bag filter was carried out. Applying the model (Aloha software package) provides an overview of possible developments of events and zones of propagation of the precipitated particulate matter through the share of cadmium (Cd) in them. In the case of malfunction of filter system, emissions of particulate matter enormously exceed the permitted values. In the conditions of the simulated accident, particle velocity of flue gases was amounted E≈738mg/s or 2657g/h of dust. The propagation of the precipitated particulate matter in the lower layer of the atmosphere, downwind, given trough the share of Cd in them, is 100m from the source of pollution for the characteristic density of 5mg/m2×day and 140m for the characteristic density of 2mg/m2×day, in the stable state of the atmosphere, i.e. 870m and 1100m, respectively, in the neutral state of the atmosphere.
Highlights
As one of the major industrial sector, secondary steel production generates large amounts of dust and slag containing iron, zinc, lead, chromium, nickel and molybdenum
Based on the analysis of the non-standard iron-bearing raw materials treatment process and the results of real composition measurements of the flue gas, the study of hazards by identification of harmful substances that occur in the accident, as well as the modeling of the system of protection against air-pollution due to the cancellation of work the bag filter was carried out
Based on the analysis of the technological process and the results of real measurements of the off-gas composition, the analysis of hazards by identification of harmful substances that occur in the accident, as well as the modeling of the system of protection against air-pollution due to the malfunction of bag filter was carried out using the Aloha software package
Summary
Al2O3, iron oxide, chromium, nickel, molybdenum, manganese, magnesium, phosphorus, and others, as well as evaporable metals Zn, Pb and Cd. Electric-arc furnace dust (EAFD) from the production of steel is considered hazardous waste due to the high alkalinity and high content of heavy metals They represent a complex material, which contains large amounts of zinc and lead, as well as significant amounts of Ca, Mn, Mg, and Cr, so they cannot be landfilled without treatment. Based on the analysis of the technological process and the results of real measurements of the off-gas composition, the analysis of hazards by identification of harmful substances that occur in the accident, as well as the modeling of the system of protection against air-pollution due to the malfunction of bag filter was carried out using the Aloha software package. Applying the model provides an overview of possible developments of events and zones of propagation of the precipitated particulate matter through the share of cadmium (Cd) in them
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