还原钛铁矿中金属铁锈蚀反应速率过程的强化

以攀枝花还原钛铁矿为原料,研究在NH4Cl溶液体系下盐酸和氧气对还原钛铁矿中金属铁锈蚀反应过程及钛铁分离效果的影响.研究结果表明:添加盐酸后,还原钛铁矿中金属铁的锈蚀反应有转变为浸出反应的倾向；通入氧气后,还原钛铁矿中金属铁的锈蚀反应历程没有发生变化,锈蚀反应速度显著加快,钛铁分离效果明显改善；还原钛铁矿中金属铁的锈蚀反应过程受内扩散控制,通入氧气后锈蚀反应的表观活化能由通入空气时的13.28kJ/mol降低至8.12 kJ/mol,氧气加快内扩散过程,促进还原钛铁矿中金属铁锈蚀过程的阴极反应,从而加快金属铁的锈蚀反应速率.

Strengthening of metallic iron rust in reduced ilmenite

Using Panzhihua reduced ilmenite as material,the effects of hydrochloric acid and oxygen gas on rust course of metallic iron and Ti-Fe separation in reduced ilmenite in NH4Cl aqueous solution were studied.The results show that when hydrochloric acid is added in the solution,metallic iron in reduced ilmenite is leached instead of being rusted.When oxygen gas is introduced into the reaction system,the rust reaction mechanism of metallic iron is not changed,and rust rate is increased remarkably,and the Ti-Fe separation effect is greatly enhanced.Rust of metallic iron in reduced ilmenite is controlled by internal diffusions.After oxygen gas is introduced,the apparent activation energy of rust reaction is decreased to 8.12 kJ/mol from 13.28 kJ/mol in air atmosphere.Oxygen gas improves the internal diffusions and cathodic reaction of rust of metallic iron.Consequently,rust rate of metallic iron is increased.