一酸化炭素雰囲気下でのセッコウの還元分解に及ぼす酸化鉄の影響

抄録

Effect of Fe₂O₃ on reductive decomposition of gypsum was investigated. The experiments were carried out by employing CaSO₄ powder of the mean particle size of 80, um which was mixed with 150 mass% Fe₂O₃, under CO : 2%-CO₂ : 30%-N₂ : balance and CO : 10%-N₂ : balance atmosphere at 1273 K, in a gas-flow type tubular reactor. Furthermore, SO₂ absorption characteristic of CaO thus regenerated from CaSO₄-Fe₂O₃ mixture by CO reductive gas was studied.
It was found that the rate of reductive decomposition of CaSO₄ was drastically enhanced by addition of Fe₂O₃. Moreover, the formation of CaS was inhibited by the addition of Fe₂O₃. Calcium ferrite such as 2CaO.Fe₂O₃ was detected in the reaction product after reductive decomposition of the mixture of CaSO₄-Fe₂O₃. As the result of SO₂ absorption experiment, it was found that CaO regenerated. from CaSO₄-Fe₂O₃ by CO reductive gas had a lower SO₂ absorption performance than CaO regenerated from CaSO₄. due to a decrease in Dore volume.