Roasting ores = heating them in the presence of oxygen to get metals such as iron, copper, and lead.
Sulfur Dioxide SO2 is a by-product...|||By products range, SO2, oxides of Nitrogen, uses large amounts of energy so therefore produces large amounts of co2. Paritculate matter - eg soot which reduces air quality. Heavy metal contamination of air, soil and water. There are loads of issues.
This is a good website that outlines them
http://www.pollutionissues.com/Re-Sy/Sme鈥?/a>
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