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首页> 外文期刊>Clean air >INTERACTION BETWEEN LIGHT/HEAVY METALS AND Al-Si PHASES FORMED FROM COMBUSTIBLE SOLID RESIDUES
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INTERACTION BETWEEN LIGHT/HEAVY METALS AND Al-Si PHASES FORMED FROM COMBUSTIBLE SOLID RESIDUES

机译：轻/重金属与可燃固体残余物形成的Al-Si相之间的相互作用

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摘要

This paper discusses the characteristics of inorganic solid particles with an emphasis on the relationships between the light/heavy metals and the ash matrix Al-Si compounds during ash solidification. The electron probe microanalysis (EPMA) of the final ash shows the distribution of major elements Al and Si in different phases such as crystalline mullite, corundum, and aluminosilicate glass. It also illustrates that the majority of the Cr coexists with the corundum phase, while Cd, Pb, Na, and K coexist with mullite and aluminosilicate glass. A quantitative analysis of the EPMA results indicates that the surface of the ash particle contains 15.8% (concentration ratio) more of Na and 14.3% more of K than at the core. However, the concentration ratio of Pb and Cd is more at the core (11.8% and 13.2%, respectively) than the surface. The ~(27)Al and ~(29)Si solid-state nuclear magnetic resonance spec-troscopy (NMR-MAS) and X-ray diffractometry studies also support the formation of three phases in the final ash. The formation of mullite and aluminosilicate amorphous phases is indicated by the presence of ~(27)Al NMR peaks at 50 ppm (AlO_4 tetrahedral group), 8 ppm (AlO_6 octahedral group), and a broad ~(29)Si NMR peak at -99 ppm. The ~(23)Na NMR spectra show a broad peak around -28.7 ppm due to the Na~+ present to compensate SiO~-. During ash evolution, Cr~(3+) replaces Al~(3+) in its octahedral sites of corundum/mullite, while Pb~(2+) and Cd~(2+) either fill oxygen vacancy in mullite or form stable compounds with the glass phase. The results clearly indicate the interaction between light/heavy metals and ash Al-Si matrix compounds.
机译：本文讨论了无机固体颗粒的特性，重点是灰分凝固过程中轻/重金属与灰分基质Al-Si化合物之间的关系。最终灰分的电子探针微分析（EPMA）显示了主要元素Al和Si在不同相中的分布，例如结晶莫来石，刚玉和硅铝酸盐玻璃。它也说明大多数Cr与刚玉相共存，而Cd，Pb，Na和K与莫来石和铝硅酸盐玻璃共存。对EPMA结果的定量分析表明，与芯部相比，烟灰颗粒的表面含有更多的15.8％（浓度比）的Na和更多的14.3％的K。但是，Pb和Cd的浓度比表面处高（分别为11.8％和13.2％）。 〜（27）Al和〜（29）Si固态核磁共振波谱（NMR-MAS）和X射线衍射研究也支持最终灰分中三相的形成。莫来石和硅铝酸盐无定形相的形成通过在50 ppm（AlO_4四面体基团），8 ppm（AlO_6八面体基团）和〜（29）Si NMR宽峰处存在〜（27）Al NMR峰表示。 99 ppm。 〜（23）Na NMR光谱显示在-28.7 ppm附近有一个宽峰，这是由于存在的Na〜+可以补偿SiO〜-。在灰分析出过程中，Cr〜（3+）在刚玉/莫来石的八面体位置替代了Al〜（3+），而Pb〜（2+）和Cd〜（2+）要么填补了莫来石中的氧空位，要么形成稳定的化合物与玻璃相。结果清楚地表明了轻/重金属与灰分Al-Si基体化合物之间的相互作用。

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