A laboratory-based investigation into the catalytic reduction of NOx in iron ore sintering with flue gas recirculation. (2nd July 2016)

• Record Type: Journal Article
• Authors: Gan, M.; Fan, X. H.; Yu, Z. Y.; Chen, X. L.; Ji, Zhiyun; Lv, W.; Liu, S.; Huang, Y. S.
• Is Part Of: Ironmaking & steelmaking. Volume 43:Number 6(2016)
• Page Start: 442
• Page End: 449
• Publication Date: 2016-07-02
• Subjects: Iron ore sintering -- Iron ore oxides -- NO reduction -- Catalytic activity; Iron industry and trade -- Periodicals; Steel industry and trade -- Periodicals; 669.1
• DOI: 10.1080/03019233.2015.1136114
• Languages: English
• ISSNs: 0301-9233

Abstract

Abstract : The catalytic reduction behaviours between NO x and CO in sinter zone were studied as using flue gas recirculation (FGR). Minerals in sinter can act as catalysts during NO x reduction. The catalytic activity of minerals has the order of calcium ferrite > kirschsteinite > fayalite. The catalytic procedure includes two steps: iron-bearing minerals are reduced to lower valence oxides by CO, and then NO is reduced to N2 by lower valence oxides. Improving the generation amount of calcium ferrite, especially acicular-type silico-ferrite of calcium and aluminium (SFCA), contributes to significantly reinforcing the catalytic performance between NO and CO. As the basicity of sinter increases to 2.2, it enables to generate maximum amount of acicular-type SFCA which has larger specific surface areas, therefore facilitates decreasing NO x emission during FGR sintering.