The products of the blast furnace process are hot metal or pig iron, slag, top gas, and flue dust. Download : Download full-size image; Figure 17.7. Blast furnace process: 1—iron burden, 2—flux and/or other additives, 3—coke, 4—hot blast with oxygen, 5—injectants, 6—taping of hot metal and slag, 7—top gas.