Metall. Res. Technol.
Volume 115, Number 1, 2018
|Number of page(s)||8|
|Published online||28 November 2017|
Analysis on the stability of chromium in mineral phases in stainless steel slag
Key laboratory for ecological metallurgy of multimetallic mineral (Ministry of Education), Northeastern University, Liaoning,
Shenyang, PR China
2 School of Metallurgy, Northeastern University, Liaoning, 110819 Shenyang, PR China
* Corresponding author: email@example.com
Accepted: 5 September 2017
Stainless steel slag from high alloy steel is hardly used in the construction industry. The chromium leaching in unstable phase is the limiting factor for the application in the slag. The aim of this study is to investigate the stability of mineral phases in stainless steel slag. In this work, the mineral phases were firstly confirmed through experimental results by SEM-EDS and XRD. Thermodynamic calculation and leaching test were adopted to characterize the theoretical stability of mineral phases in aqueous solution. The results showed that the main phases in the stainless steel slag were spinel, melilite [solid solution of gehlenite (Ca2Al2SiO7) and akermanite (Ca2MgSi2O7)], dicalcium silicate, merwinite and periclase phases. It can be concluded that the minerals behave differently when dissolving in aqueous solution and the dissolution of dicalcium silicate (Ca2SiO4), merwinite (Ca3MgSi2O8), akermanite (Ca2MgSi2O7) and periclase phase could be generally higher, especially at lower pH values. In addition, the solubility of chromium in the spinel phase is considered low. The leaching test demonstrated that the formation of spinel phase can limit the leaching of chromium and the chromium existing in the silicate and periclase phases can facilitate the chromium leaching.
Key words: stainless steel slag / mineral / thermodynamic calculation / chromium leaching
© EDP Sciences, 2017
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