Effect of cooling regime on phase transformation and chromium enrichment in stainless-steel slag

ABSTRACT

Cooling regime of stainless-steel slag has a great influence on the migration rule of chromium. Effect of cooling rate on chromium distribution in CaO–SiO₂–MgO–Al₂O₃–Fe_xO–Cr₂O₃ system has been studied by FactSage, XRD and SEM-EDS in this paper. Results showed that the main phases in stainless-steel slag are spinel, bredigite, wustite, lime and periclase. Chromium was enriched in the stable phases. With the decrease in cooling rate, the size of chromium-rich phase increased relatively while chromium content in spinel phase reduced. Rapid cooling was favourable to the chromium enrichment in spinel phase in high basicity (high than 2.0) stainless-steel slag.

KEYWORDS:

• Stainless-steel slag
• cooling rate
• spinel
• distribution

Acknowledgements

We are grateful to anonymous reviewers for helpful comments on the original manuscript.

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

The financial support from the National Natural Science Foundation of China (No. U1360204) is gratefully acknowledged.