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

IF 2.3 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

JOM Pub Date : 2025-06-18 DOI:10.1007/s11837-025-07499-5

Xi Lan, Jintao Gao, Guoliang Feng, Zhancheng Guo

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Abstract

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 MnCr_1.93Al_0.07O₄ < FeCr_1.94Al_0.06O₄ < MgCr_1.89Al_0.11O₄. The findings of this research can serve as a theoretical foundation for the detoxification and utilization of Cr-bearing slag.

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含铬渣中不同cr尖晶石晶体的原位分离及结构表征

含铬渣是不锈钢生产中重要的废渣。cr尖晶石是渣中突出的含cr凝固相，而cr尖晶石基础数据的缺乏严重限制了含cr渣的可持续利用。本研究首次采用超重力技术从含铬渣中原位分离出Fe-Cr/Mn-Cr/ mg - cr -尖晶石晶体。分离渣相中Cr2O3含量由4.36%下降至1.74%，Cr回收率由53.71%上升至80.91%。随后，通过对XRD数据进行Rietveld细化，对各种高纯cr尖晶石晶体进行结构表征，确定cr尖晶石晶体的基本晶格参数。此外，还测量了不同Cr尖晶石中Cr的浸出量，比较了它们的凝固能力。结果表明，不同Cr尖晶石对Cr的固定效果存在显著差异，依次为mncr1.93 al0.070 o4 <、fecr1.94 al0.060 o4 <、mgcr1.89 al0.110 o4。研究结果可为含铬渣的脱毒利用提供理论依据。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

JOM 工程技术-材料科学：综合

CiteScore

4.50

自引率

3.80%

发文量

540

审稿时长

2.8 months

期刊介绍： JOM is a technical journal devoted to exploring the many aspects of materials science and engineering. JOM reports scholarly work that explores the state-of-the-art processing, fabrication, design, and application of metals, ceramics, plastics, composites, and other materials. In pursuing this goal, JOM strives to balance the interests of the laboratory and the marketplace by reporting academic, industrial, and government-sponsored work from around the world.