A review on reduction technology of air pollutant in current China's iron and steel industry

China's iron and steel industry mainly adopts the "BF-BOF" steelmaking process (Blast furnace- Basic oxygen furnace) with coal as the main energy source. Therefore, a large amount of air pollutants is emitted during the iron and steel production process, mainly including sulfur dioxide (SO2), nitrogen oxides (NOx) and fine particulate matter (PM), etc. Therefore, China's iron and steel industry has implemented ultra-low emission transformation from 2019 to reduce pollutant emissions in the steel production process. China's steel industry has achieved excellent results in reducing pollutant emissions. This article summarizes the emission reduction experience of China's iron and steel industry. Firstly, it summarizes the generation mechanism of sulfur dioxide, nitrogen oxides and particulate matter in the steel production process. Secondly, this article focuses on reviewing the mainstream pollutants emission reduction technologies (including source reduction technology and process reduction technology) and flue gas treatment technology applied or researched by China's steel companies. Finally, the current pollutant emission status of China's iron and steel industry and the future development direction of China's iron and steel industry is analyzed.