盐酸强化还原钛铁矿中金属铁的锈蚀动力学

Rusting kinetics of metallic iron in reduced ilmenite strengthened by hydrochloride

研究盐酸对攀枝花还原钛铁矿中金属铁锈蚀反应速率和锈蚀法铁钛分离效果的影响,并对还原钛铁矿中金属铁的锈蚀反应动力学进行分析。结果表明:盐酸显著提高还原钛铁矿中金属铁的锈蚀反应速率及锈蚀法钛铁分离的效果;当盐酸用量由0增加到4%时,还原钛铁矿中金属铁的锈蚀率由43%提高到90%以上,锈蚀法钛铁分离后富钛料中TiO2的品位由64.92%提高到81.21%,总铁含量(FeT)由18.25%降到5.06%;还原钛铁矿中金属铁的锈蚀反应受内扩散控制,添加4%的盐酸,锈蚀反应的表观活化能由59.26kJ/mol降低到38.65kJ/mol,其作用机理是盐酸促进金属铁锈蚀过程的阴极反应,从而加快Fe2+的生成和扩散速率。

The effect of hydrochloride on the rusting rate of metallic iron in Panzhihua reduced ilmenite and separation efficiency of titanium and iron by rusting process were studied.The rusting kinetic of the metallic iron in reduced ilmenite was analyzed.The results show that hydrochloride can significantly increase the reaction rate and separation efficiency of titanium and iron.As the dosage of hydrochloride increases from 0 to 4%,the rusting rate of the metallic iron in the reduced ilmenite increases from 43% to more than 90%,TiO2 grade of Ti-rich material increases from 64.92% to 81.21%,while total Fe grade decreases from 18.25% to 5.06%.The rusting reaction is controlled by internal diffusion.Adding 4% hydrochloride,the rusting apparent activation energy of the rusting reaction decreases from 59.26 kJ/mol to 38.65kJ/mol.The mechanism is that hydrochloride promotes the cathodic reaction of the rusting reaction,thus speeding up the formation and the diffusion rate of Fe2＋.