Effect of MgO on migration and distribution of chromium in stainless-steel slag glass–ceramics and glass properties
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Herein, stainless-steel slag was used to prepare glass–ceramics. The effects of the MgO content on the occurrence, distributionstate, and migration behavior of Cr in glass–ceramics as well as glass properties were systematically studied. Results revealedthat in the nucleation stage, the number of Cr-spinel (Cr spinel) nanocrystals initially increased and then decreased with theincreasing MgO content. In the crystallization stage, the diopside crystal phase considered Cr-spinel nanocrystals asheterogeneous nuclei, which gradually nucleated and grew. Transmission electron microscopy and X-ray photoelectronspectroscopy analyses showed that part of Cr in the spinel migrated into the diopside lattice and some other parts remainedin the Cr spinel wrapped by the diopside. Cr in the glass phase also diffused and migrated into the diopside lattice with theformation of diopside crystals. When the MgO content was 12.3 wt.%, 97.33 wt.% of the total amount of Cr was observedin the diopside crystal phase and the leaching concentration of Cr in the glass–ceramics was only 0.006 mg/L. The compressivestrength of the glass–ceramics was 261.7 MPa, and the Vickers hardness was 1007.7 HV. The research results providetheoretical and technical support for strengthening Cr fixation and realizing harmless and high-value utilization of stainlesssteelslag.
Abstract
Herein, stainless-steel slag was used to prepare glass–ceramics. The effects of the MgO content on the occurrence, distributionstate, and migration behavior of Cr in glass–ceramics as well as glass properties were systematically studied. Results revealedthat in the nucleation stage, the number of Cr-spinel (Cr spinel) nanocrystals initially increased and then decreased with theincreasing MgO content. In the crystallization stage, the diopside crystal phase considered Cr-spinel nanocrystals asheterogeneous nuclei, which gradually nucleated and grew. Transmission electron microscopy and X-ray photoelectronspectroscopy analyses showed that part of Cr in the spinel migrated into the diopside lattice and some other parts remainedin the Cr spinel wrapped by the diopside. Cr in the glass phase also diffused and migrated into the diopside lattice with theformation of diopside crystals. When the MgO content was 12.3 wt.%, 97.33 wt.% of the total amount of Cr was observedin the diopside crystal phase and the leaching concentration of Cr in the glass–ceramics was only 0.006 mg/L. The compressivestrength of the glass–ceramics was 261.7 MPa, and the Vickers hardness was 1007.7 HV. The research results providetheoretical and technical support for strengthening Cr fixation and realizing harmless and high-value utilization of stainlesssteelslag.
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