Effects of iron oxide on crystallization behavior and spatial distribution of spinel in stainless steel slag

• Published in: International journal of minerals, metallurgy and materials metallurgy and materials, 2024-02, Vol.31 (2), p.292-300
• Main Authors: Yan, Zihang, Zhao, Qing, Han, Chengzhi, Mei, Xiaohui, Liu, Chengjun, Jiang, Maofa
• Format: Article
• Language: English
• Subjects: Ceramics; Characterization and Evaluation of Materials; Chemistry and Materials Science; Chromium; Composites; Corrosion and Coatings; Corrosion resistance; Crystallization; Glass; Iron oxides; Materials Science; Metallic Materials; Natural Materials; Research Article; Slag; Spatial distribution; Spinel; Stainless steel; Stainless steels; Surfaces and Interfaces; Thin Films; Tribology
• ISSN: 1674-4799; 1869-103X
• DOI: 10.1007/s12613-023-2713-7

Chromium plays a vital role in stainless steel due to its ability to improve the corrosion resistance of the latter. However, the release of chromium from stainless steel slag (SSS) during SSS stockpiling causes detrimental environmental issues. To prevent chromium pollution, the effects of iron oxide on crystallization behavior and spatial distribution of spinel were investigated in this work. The results revealed that FeO was more conducive to the growth of spinels compared with Fe 2 O 3 and Fe 3 O 4 . Spinels were found to be mainly distributed at the top and bottom of slag. The amount of spinel phase at the bottom decreased with the increasing FeO content, while that at the top increased. The average particle size of spinel in the slag with 18wt% FeO content was 12.8 µm. Meanwhile, no notable structural changes were observed with a further increase in FeO content. In other words, the spatial distribution of spinel changed when the content of iron oxide varied in the range of 8wt% to 18wt%. Finally, less spinel was found at the bottom of slag with a FeO content of 23wt%.