Formation Mechanism and Emission Reduction of PCDD/Fs in Iron Ore Sintering
CANG Da-qiang1, 2, WEI Ru-fei1, 2, ZHANG Ling-ling3, BAI Yuan-yuan4
1. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China 2. State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China 3. School of Civil and Enviromental Engineering, University of Science and Technology Beijing, Beijing 100083, China 4. Key Laboratory of Electromagnetic Processing of Materials of Ministry of Education, Northeastern University, Shenyang 110002, Liaoning, China
Abstract:Iron ore sintering is an important industrial source of dioxin (PCDD/Fs), and the mechanism of generating dioxins in sintering process is very complex. Reaction by a precursor compound of an organic compound and De novo are two main ways, and De novo is the main way. Dioxins in the sintering machine are produced not only in the dry zone, but also produced in exhaust flue after the sinter zone and the combustion zone. There are three ways to reduce emissions of dioxins: source control, process control and operation, and treatment in the end. Source control is the best choice for the inhibition of dioxin, and treatment in the end is often chosen in the current process. Single dioxin abatement technologies may not be feasible for the complexity of sintering flue gas composition, and the investment is relatively large. For the technical characteristics of the sintering process and flue gas, the best way is synergistic emission reduction. Circulating sintering flue gas can reduce dioxins, [NOx] and dust content, etc. So it will be an important development direction.