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<p>Chromium (Cr)-bearing slag is a significant waste product associated with stainless steel production. Cr-spinel is a prominent Cr-bearing solidification phase in the slag, while the lack of basic data for Cr-spinel severely limits the sustainable utilization of Cr-bearing slag. In this study, the in situ separation of Fe-Cr/Mn-Cr/Mg-Cr-spinel crystals from the Cr-bearing slag was first conducted using super-gravity technology. The Cr<sub>2</sub>O<sub>3</sub> content in the separated slag phase diminished from 4.36% to 1.74%, while the recovery ratio of Cr surged from 53.71% to 80.91%. Subsequently, the structural characterization of various high-purity Cr-spinel crystals was performed through Rietveld refinement of XRD data to determine the basic lattice parameters of Cr-spinel crystals. Additionally, the leaching of Cr from various Cr-spinels was measured to compare their solidification capacity. The results indicated significant differences in the Cr immobilization effects among different Cr-spinels, with the order being MnCr<sub>1.93</sub>Al<sub>0.07</sub>O<sub>4</sub> &lt; FeCr<sub>1.94</sub>Al<sub>0.06</sub>O<sub>4</sub> &lt; MgCr<sub>1.89</sub>Al<sub>0.11</sub>O<sub>4</sub>. The findings of this research can serve as a theoretical foundation for the detoxification and utilization of Cr-bearing slag.</p>

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In Situ Separation and Structural Characterization of Various Cr-Spinel Crystals from Cr-Bearing Slag

  • 期刊论文

  • 发表日期：

    2025年6月18日

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  • Xi Lan,
  • Jintao Gao,
  • Guoliang Feng,
  • Zhancheng Guo

摘要

Chromium (Cr)-bearing slag is a significant waste product associated with stainless steel production. Cr-spinel is a prominent Cr-bearing solidification phase in the slag, while the lack of basic data for Cr-spinel severely limits the sustainable utilization of Cr-bearing slag. In this study, the in situ separation of Fe-Cr/Mn-Cr/Mg-Cr-spinel crystals from the Cr-bearing slag was first conducted using super-gravity technology. The Cr2O3 content in the separated slag phase diminished from 4.36% to 1.74%, while the recovery ratio of Cr surged from 53.71% to 80.91%. Subsequently, the structural characterization of various high-purity Cr-spinel crystals was performed through Rietveld refinement of XRD data to determine the basic lattice parameters of Cr-spinel crystals. Additionally, the leaching of Cr from various Cr-spinels was measured to compare their solidification capacity. The results indicated significant differences in the Cr immobilization effects among different Cr-spinels, with the order being MnCr1.93Al0.07O4 < FeCr1.94Al0.06O4 < MgCr1.89Al0.11O4. The findings of this research can serve as a theoretical foundation for the detoxification and utilization of Cr-bearing slag.