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首页> 外文期刊>ISIJ international >Tetsu-to-Hagane, Vol. 99 (2013), No. 9 (September)
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Tetsu-to-Hagane, Vol. 99 (2013), No. 9 (September)

机译：哲海（ゔ）l。 99（2013），. 9（将p设为m）

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摘要

A new approach to quantifying free magnesium oxide (f-MgO) in steel-making slag has been proposed by using solid-state ~(25)Mg nuclear magnetic resonance (NMR) spectroscopy. Although ~(25)Mg (I= -5/2) signals in solid materials often suffer from the second-order quadrupolar broadening, a quite narrow and symmetric signal of MgO is obtained in the ~(25)Mg NMR spectrum thanks to its highly symmetric Mg sites. By contrast, other Mg-contain-ing compounds (e.g. magnesium hydroxide, diopside and akermanite) are more or less affected by the second-order quadrupolar interaction, resulting in severe broad signals buried in the spectral noise. Therefore, the MgO peak can be only detected for steelmaking slag in the ~(25)Mg NMR spectrum without any hindrance. It is significant to select the optimum internal standard (e.g. Mg_2Si and MgS) showing the narrow ~(25)Mg signal being free from the second-order quadrupolar broadening like MgO to obtain reliable data. Accuracy of f-MgO concentration obtained by the present method has been demonstrated by using the standard samples in which f-MgO concentration is known. The advantages of the present method to quantify f-MgO in steel-making slag, no need to dissolve slag in any solvent and detection of surface f-MgO as well as inner f-MgO of slag particles, should outweigh the disadvantages of poor signal-to-noise ratio which is surmounted by using a larger sample rotor and/or a higher magnetic field. These ideas for quantification of f-MgO by NMR should be explicated to that of free calcium oxide (f-CaO) which is responsible for hydrated expansion of steelmaking slag as well.
机译：提出了一种利用固态〜（25）Mg核磁共振（NMR）光谱定量钢渣中游离氧化镁（f-MgO）的新方法。尽管固体材料中的〜（25）Mg（I = -5/2）信号经常遭受二阶四极扩宽的影响，但由于〜（25）Mg NMR光谱获得的MgO信号非常狭窄且对称高度对称的镁位点。相比之下，其他含镁化合物（例如氢氧化镁，透辉石和钙钛矿）或多或少地受到二阶四极相互作用的影响，从而导致严重的宽信号埋在频谱噪声中。因此，仅能在〜（25）Mg NMR谱图中检测出炼钢渣的MgO峰而没有任何障碍。重要的是选择最佳内标（例如Mg_2Si和MgS），以显示窄的〜（25）Mg信号没有像MgO那样的二阶四极展宽，以获得可靠的数据。已经通过使用已知f-MgO浓度的标准样品证明了通过本方法获得的f-MgO浓度的准确性。本发明用于量化炼钢炉渣中f-MgO的方法的优点，不需要将炉渣溶解在任何溶剂中，并且检测炉渣颗粒的表面f-MgO以及内部f-MgO的优点，应胜过信号差的缺点。噪声比通过使用更大的样品转子和/或更高的磁场来克服。这些通过NMR定量f-MgO的想法应与游离氧化钙（f-CaO）的想法相提并论，游离氧化钙也负责炼钢炉渣的水合膨胀。

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