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        Effect of MgO on migration and distribution of chromium in stainless-steel slag glass–ceramics and glass properties

        Zhifang Tong,Congcong Xu,Jiaxing Wang,Zhiheng Jia 한양대학교 청정에너지연구소 2023 Journal of Ceramic Processing Research Vol.24 No.1

        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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        Cosmogenic nuclides (10Be and 26Al) erosion rate constraints in the Badain Jaran Desert, northwest China: implications for surface erosion mechanisms and landform evolution

        Tong Zhao,Wenjing Liu,Zhifang Xu,Taoze Liu,Sheng Xu,Lifeng Cui,Chao Shi 한국지질과학협의회 2019 Geosciences Journal Vol.23 No.1

        Both tectonics and climate affect surface erosion and change the landform. Long-term surface erosion rates determined by in situ produced cosmogenic nuclides are useful quantitative constraints for landform evolution in geological time scale. Measurements of cosmogenic 10Be and 26Al in the granitic rocks exposed in the Badain Jaran Desert, give a mean erosion rate of 7.3 ± 2.6 m/Ma, which is an order of magnitude higher than those reported in other extremely arid regions. Tectonic activity is supposed to be the first order control on regional erosion rate by comparing the 10Be erosion rates of arid regions with different precipitation ranges and tectonic activities worldwide. However the higher erosion rates in the Badain Jaran Desert compared with other arid regions within the stable tectonic background were attributed to the wind erosion and periodically warmer and wetter climate since late Pleistocene. Besides, the estimated eroded mass flux of 7.8 × 104 t/y suggests that erosion products of bedrocks in the Badian Jaran Desert only contribute minor desert deposits, which indicates massive exogenous materials input to the desert.

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