Nature of atmospheric emissions

During melting, abrasion of the charge against the refractory lining will also generate dust. 

A third source of particulate matter is coke ash, generated in the melting zone, which is not trapped by the slag phase. 

Carbonaceous smoke is airborne matter formed by the incomplete combustion of organic matter in the cupola. Scrap contaminants such as oil and grease, wood, textiles and, rubber will form oily vapours in the stack gases. Vapours and partially burnt organic matter may carry unpleasant smells. 

scrap cleanliness and its nature significantly effect the nature of the emissions. The burning of coke creates odorous gas emissions containing CO2, CO and SO2. Decreasing the proportion of the coke charge (by increasing the thermal efficiency) or (partial or complete) substitution of the coke by natural gas can help reduce the levels of these substances. 

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