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ORIGIN, PROPERTIES, PROCESSING AND USE OF FLY DUST FROM CUPOLA FURNACES
Abstract
Cupola furnaces are still considered the most suitable furnace units for cast iron melting. Typical exhaust gas from a cupola furnace contains CO, SO2 and NOx. A relatively large amount of dust emissions are emitted from the cupola furnace. These are formed during melting in the cupola furnace. These emitted particles can contain CaO, FeO, Pb, MnO, MgO, SiO2 and Zn. Crushing and mechanical abrasion during charge preparation and charging generate particles, some of which are emitted immediately. Dust is also generated during melting, by abrasion of the charge and lining. The paper deals with fly dust from hot-air and cold-air cupola furnaces. Their chemical composition, granulometry and density were analyzed. The high carbon content in the fly dust together with the iron content (in the form of oxides) indicate its prospective reuse in the cupola furnace charge. The dust was pelletized and briquetted using various binders, or even without a binder. Bentonite, water glass (without drying and with drying) and cement were used as binders. In the case of fly dust from a hot-air cupola furnace, bentonite was the most effective binder, and in the case of fly dust from a cold-air cupola furnace, it was water glass (after drying).
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