Effect of binary basicity on chromium occurrence in stainless steel slag
J. Min. Metall. Sect. B-Metall., 58 (1) (2022) 11-18 DOI:10.2298/JMMB210304043Z
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Available online 08 October 2021
(Received 04 March 2021; Accepted 05 August 2021)
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Abstract
Comprehensive utilization of stainless-steel slag (SSS) is restrained due to the risk of Cr6+ leaching. Based on the studying the microstructure of synthetic slag (SS) containing Cr2O3 with XRD, SEM-EDS, and Image pro, the effect of binary basicity on the chromium occurrence in SSS was investigated. The results indicated that the binary basicity had a significant impact on the properties of spinel crystals. There was a positive correlation between the calcium content in spinel crystals and the SS basicity. The size of spinel crystals varied from large to small and the precipitation occurrence changed with the basicity increase. Furthermore, the chromium occurrences changed with the basicity. The chromium was produced in spinel crystals at lower basicity, but as the basicity increased to 3.0, the chromium precipitated as calcium chromate. In view of the relationship between the chromium leaching behavior and its occurrence, increasing basicity raised the Cr6+ leaching.
Keywords: Stainless steel slag (SSS); Hexavalent chromium; Spinel crystals; Binary basicity
Correspondence Address:
J.-L. Li,
a The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan, China; b Hubei Provincial Key Laboratory for New Processes of Ironmaking and Steelmaking, Wuhan University of Science and Technology, Wuhan, China; c Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan University of Science and Technology, Wuhan, China;,
email: jli@wust.edu.cn
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