(中南大學(xué) 資源加工與生物工程學(xué)院，長沙 410083)
摘 要: 研究鹽酸對攀枝花還原鈦鐵礦中金屬鐵銹蝕反應(yīng)速率和銹蝕法鐵鈦分離效果的影響，并對還原鈦鐵礦中金屬鐵的銹蝕反應(yīng)動力學(xué)進(jìn)行分析。結(jié)果表明：鹽酸顯著提高還原鈦鐵礦中金屬鐵的銹蝕反應(yīng)速率及銹蝕法鈦鐵分離的效果；當(dāng)鹽酸用量由0增加到4%時，還原鈦鐵礦中金屬鐵的銹蝕率由43%提高到90%以上，銹蝕法鈦鐵分離后富鈦料中TiO2的品位由64.92%提高到81.21%，總鐵含量(FeT)由18.25%降到5.06%；還原鈦鐵礦中金屬鐵的銹蝕反應(yīng)受內(nèi)擴(kuò)散控制，添加4%的鹽酸，銹蝕反應(yīng)的表觀活化能由59.26 kJ/mol 降低到38.65 kJ/mol，其作用機(jī)理是鹽酸促進(jìn)金屬鐵銹蝕過程的陰極反應(yīng)，從而加快Fe2+的生成和擴(kuò)散速率。
關(guān)鍵字: 還原鈦鐵礦；鈦鐵分離；富鈦料；還原銹蝕；動力學(xué)
strengthened by hydrochloride
（School of Resources Processing and Bioengineering, Central South University, Changsha 410083, China）
Abstract: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+.
Key words: reduced ilmenite; titanium-iron separation; Ti-rich material; reduction-rusting; kinetic
