FACT SHEET Steel industry coproducts
plants often use a mix of DRI and recycled steel feeds. On average the production of one tonne of steel results in 200 kg (EAF) to 400 kg (BF/BOF) of coproducts. These include slags, dusts, sludges and other materials. Ironmaking and steelmaking slags More than 400 million tonnes of iron and steel slag is produced each year.