石炭フライアッシュの酸処理による元素抽出と表面組織の変化(<特集>石炭利用と分析化学)

概要

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In order to have an insight into the acid digestion methods for the elemental analysis of coal fly ash, the extent of dissolution of some major and trace elements from the fly ash samples treated by various acids (based on hydrochloric, nitric and sulphuric acid), and the accompanied changes in the surface elemental composition and in the surface morphology of the ash particles were investigated. The amount extracted as determined by ICP emission spectrometry ranged from several % to 80 % depending on elements, but, for the most elements, the efficiency of the extraction varied with the acid only within a factor of two. Characteristic etching patterns were observed on the individual particles by scanning electron microscopy, while ESCA measurements revealed that most elements except Si, Al and Ti were almost completely dissolved from the surface layers of the ash particles. An important part of the dissolution of elements, especially trace elements, is considered to take place without giving clear etching patterns, which is consistent with the reported mechanism of the accumulation of trace elements onto coal fly ash particles.
社団法人日本分析化学会の論文
1985-05-05