赤外分光分析法による無機水酸化物の脱水挙動の解析と不定形耐火物評価技術への応用(<特集>分析技術と方法論の最近の進歩)

概要

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Inorganic oxides are widely used as raw materials and formed as byproducts in iron and steelmaking processes. Some inorganic oxides such as CaO and MgO absorb water to form inorganic hydrates. When hydrates form, they expand. On the other hand, hydrates often dehydrate on heating to form oxides. To analyze hydrates in oxides is therefore important in order to examine hydration and dehydration processes. This paper concerns with the analysis of dehydration processes of Mg(OH)_2, Ca(OH)_2 and Al(OH)_3 in which high temperature infrared spectrophotometry and thermogravimetry (TG) were used to elucidate the expansion behavior of monolithic refractories. Two monolithic refractories, which contained the same amount of MgO, were investigated with hydration. Mg(OH)_2 was observed in the samples that expanded after pressed. No Mg(OH)_2 was observed in the sample that did not expand after pressed. In addition, infrared spectrums give the amount of Mg(OH)_2. Infrared spectrophotometry can be used for the quantitative analysis of the small amount of inorganic hydrates in oxides.
社団法人日本鉄鋼協会の論文
2007-02-01