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Open AccessArticle

Experimental Study on Precipitation Behavior of Spinels in Stainless Steel-Making Slag under Heating Treatment

1,2,3,*, 1, 1 and 2,3
1
The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China
2
Hubei Provincial Key Laboratory for New Processes of Ironmaking and Steelmaking, Wuhan University of Science and Technology, Wuhan 430081, China
3
Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan University of Science and Technology, Wuhan 430081, China
*
Author to whom correspondence should be addressed.
Processes 2019, 7(8), 487; https://doi.org/10.3390/pr7080487
Received: 3 July 2019 / Revised: 25 July 2019 / Accepted: 29 July 2019 / Published: 1 August 2019
(This article belongs to the Special Issue Process Modeling in Pyrometallurgical Engineering)
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Abstract

The stability of chromium in stainless steel slag has a positive correlation with spinel particle size and a negative correlation with the calcium content of the spinel. The effect of heating time on the precipitation of spinel crystals in the CaO-SiO2-MgO-Al2O3-Cr2O3-FeO system was investigated in the laboratory. Scanning electron microscopy with energy-dispersive and X-ray diffraction were adopted to observe the microstructure, test the chemical composition, and determine the mineral phases of synthetic slags, and FactSage7.1 was applied to calculate the crystallization process of the molten slag. The results showed that the particle size of the spinel crystals increased from 9.42 to 10.73 μm, the calcium content in the spinel crystals decreased from 1.38 at% to 0.78 at%, and the content of chromium in the spinel crystal increased from 16.55 at% to 22.78 at% with an increase in the heating time from 0 min to 120 min at 1450 °C. Furthermore, the species of spinel minerals remained constant. Therefore, an extension in the heating time is beneficial for improving the stability of chromium in stainless steel slag. View Full-Text
Keywords: stainless steel slag; heating time; Cr2O3; spinel; crystal size stainless steel slag; heating time; Cr2O3; spinel; crystal size
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Li, J.; Mou, Q.; Zeng, Q.; Yu, Y. Experimental Study on Precipitation Behavior of Spinels in Stainless Steel-Making Slag under Heating Treatment. Processes 2019, 7, 487.

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