碱金属盐对气基还原铁矿石的催化规律研究

Study on Catalytic Mechanism of Gas-based Reduction of Iron Ore

通过气体催化还原氧化铁试验,研究了碱金属盐对气基还原铁氧化物反应的影响规律,对于同一种阳离子的盐催化活性规律为:氟化物>氯化物>碘化物>溴化物;硝酸盐>氢氧化物>碳酸盐>硫酸盐>磷酸盐。并提出了一种新的微观催化机理:添加剂的催化作用在于添加剂的原子改变Fe-O化学键的作用程度;添加剂的催化活性与阳离子、阴离子种类以及化合物的稳定性有关;这三方面因素相互耦合,共同决定添加剂的催化性能;其催化性能用公式表示为:Ψ=αf(M^+)+βf(X^-)-γ(T)f(MX)。

Influence of alkali salt on gas- based reduction of iron ore was studied. For the same cation, the sequences of the catalytic effect F^- 〉 Cl^- 〉 I^- 〉 Br^- and NO3^- 〉 OH^- 〉 CO3^2- 〉 SO4^2- 〉 PO4^3- are shown. The new catalytic mechanism was proposed, Upon this theory, the catalytic effect of catalyst is attributed to Fe - O chemical bond influenced by catalyst. The effect of catalysts differs from the kinds of cations and anions and stabilization of compounds, which can be formulated as Ψ=αf（M^＋）＋βf（X^-）-γ（T）f（MX）.