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首页> 外文期刊>ISIJ international >Chemical State Of Chromium In Cao-sio_2 Base Oxides Annealed Under Different Conditions
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Chemical State Of Chromium In Cao-sio_2 Base Oxides Annealed Under Different Conditions

机译：不同条件下Cao-sio_2基氧化物中铬的化学状态

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摘要

In order to understand the formation mechanism of Cr(VI) in chromium-containing steel slag, X-ray diffrac-tiometry (XRD), X-ray absorption spectroscopy (XAS) in the region of X-ray absorption near edge structure (XANES), and X-ray photoelectron spectroscopy (XPS) measurements were performed for analyzing the chromium contained in the model slag of CaO-SiO_2 base. The model slag was annealed under different temperatures and atmospheres to change the chemical state of chromium. XRD results showed that a diffraction peak that can be assigned to CaCrO_4 comprising of Cr(VI) was detected in the model-slag sample annealed under a high partial pressure of oxygen (air). XANES results showed that the Cr(VI) concentration in the slag increased by annealing under a high partial pressure of oxygen, while it was very low in the slag sample annealed under a low partial pressure of oxygen. The XANES results were consistent with the XRD results. The formation conditions of Cr(VI) were discussed on the basis of the thermodynamic characteristics of a Ca-Cr-O system. The XPS results for the slag surface were dependent on the leaching tests performed on the slag, while the XANES results were insensitive to the leaching tests. This indicates that Cr(VI) dissolved from only a surface layer of the model slag. The chromium that dissolved from the slag in an aqueous solution by the leaching test was also analyzed and was found to be in the form of Cr(VI); further, its concentration depended on the annealing conditions of the slag.
机译：为了了解含铬钢渣中Cr（VI）的形成机理，X射线衍射法（XRD），X射线吸收光谱法（XAS）在靠近边缘结构的X射线吸收区域（XANES） ），并进行X射线光电子能谱（XPS）测量，以分析CaO-SiO_2基模型渣中所含的铬。模型炉渣在不同的温度和气氛下退火以改变铬的化学状态。 XRD结果表明，在氧（空气）高分压下退火的模型炉渣样品中检测到可归因于由Cr（VI）组成的CaCrO_4的衍射峰。 XANES结果表明，在较高的氧气分压下进行退火可提高炉渣中的Cr（VI）浓度，而在较低的氧气分压下进行退火的炉渣样品中的Cr（VI）浓度非常低。 XANES结果与XRD结果一致。根据Ca-Cr-O体系的热力学特性，讨论了Cr（VI）的形成条件。炉渣表面的XPS结果取决于对炉渣进行的浸出试验，而XANES结果对浸出试验不敏感。这表明Cr（VI）仅从模型炉渣的表层溶解。还对通过浸出试验从炉渣中溶解的铬进行了分析，结果发现其为Cr（VI）形式。此外，其浓度取决于炉渣的退火条件。

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