NOx Emission in Iron and Steel Production: A Review of Control Measures for Safe and Eco-Friendly Environment
Iron and steel manufacturing involved preparation of raw materials through processes such as sintering, pelletizing and coke making. During these processes, pollutants such as Sulphur (iv) oxides (SO2) Carbon II oxides (CO), Nitrogen oxides (NOX), Volatile organic compounds (VOC) and Particulate matter (PM) etc. are emitted. The present work is aimed at describing some mitigation technologies of controlling emissions in iron and steel production. The processes involved in the production of iron and steel using Blast Furnace (BF) and Basic Oxygen Furnace (BOF) has been described. The mitigation technologies of controlling emissions were analyzed and discussed with environmental impacts based on the economical and technical factors. In this work, the data presented is based on existing reviews. The combination of low NOX burner (LNB) and Selective catalytic reduction (SCR) is capable of reducing emission for up to 90% and above. Emissions of other pollutants into the atmosphere as a result of ammonia slip, formation of acids and other gases are harmful to the environment and causes damage to the SCR systems. Installation and operation cost are the major impacts of the SCR technology in the process of iron and steel production.