Lin, Y., Luo, Q., Yan, B. et al. Effect of B₂O₃ addition on mineralogical phases and leaching behavior of synthetic CaO–SiO₂–MgO–Al₂O₃–CrOₓ slag. J Mater Cycles Waste Manag 22, 1208–1217 (2020). https://doi.org/10.1007/s10163-020-01015-4
Effect of B₂O₃ addition on mineralogical phases and leaching behavior of synthetic CaO–SiO₂–MgO–Al₂O₃–CrOₓ slag
|Author:||Lin, Yong1; Luo, Qingyun1; Yan, Baijun1;|
1School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing, 100083, China
2Research Unit of Process Metallurgy, University of Oulu, 90014, Oulu, Finland
|Online Access:||PDF Full Text (PDF, 2.2 MB)|
|Persistent link:|| http://urn.fi/urn:nbn:fi-fe2020091069232
|Publish Date:|| 2020-09-10
Boron oxide is frequently applied in modification of stainless steelmaking slag to mitigate the disintegration of slag. In this work, the effect of B₂O₃ on mineralogical phases and hexavalent chromium leaching behavior of synthetic CaO–SiO₂–MgO–Al₂O₃–CrOx slag was investigated. Di-calcium silicate, merwinite, spinel, akermanite, and matrix phase were observed as main minerals in slags by scanning electron microscope (SEM) equipped with energy-dispersive spectrometry (EDS) and X-ray diffraction (XRD) techniques. It was found that 2% B₂O₃ addition is sufficient to eliminate the disintegration of synthetic slag by suppressing the phase transition to γ-Ca₂SiO₄. The size of spinel phase increases with increasing B₂O₃, which could be well interpreted by enhanced Ostwald ripening. The amount of Ca₂SiO4 phase in slag was reduced by addition of B₂O₃; however, excess B₂O₃ (> 2%) addition would significantly increase chromium concentration and overall chromium distribution in Ca₂SiO₄ phase. Leaching results according to US-EPA-3060A method indicated that excess boron oxide addition (> 2%) leads to a significant increase of hexavalent chromium leaching concentrations and should be avoided for stabilizing stainless steel slag.
Journal of material cycles and waste management
|Pages:||1208 - 1217|
|Type of Publication:||
A1 Journal article – refereed
|Field of Science:||
215 Chemical engineering
216 Materials engineering
Open access funding provided by University of Oulu including Oulu University Hospital. This work was supported by the Academy of Finland for Genome of Steel Grant (No. 311934) and Natural Science Foundation of China (NSFC Contract No. 51774026).
© The Author(s) 2020. This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.