攀枝花钛铁矿固态还原行为.pdf

文档介绍：11 1
第 41 卷第 5 期中南大学学报(自然科学版)
2010 年 10 月 Journal of Central South University (Science and Technology) Oct. 2010

攀枝花钛铁矿固态还原行为

郭宇峰,游高,姜涛,邱冠周

(中南大学资源加工与生物工程学院,湖南长沙,410083)

摘要:以我国攀枝花钛铁矿为研究对象,研究钛铁矿固态碳热还原反应的宏观动力学、钛铁矿还原产物的物相
转变及显微结构的变化规律,探讨攀枝花钛铁矿固态碳热还原行为。研究结果表明:钛铁矿精矿还原速率较小,
在温度为 1 000~1 150 ℃时,攀枝花钛铁矿精矿的还原过程受界面化学反应控制,反应的表观活化能为
kJ/mol;在钛铁矿还原过程中,将会形成 M3O5 型(M 为 Fe,Ti,Mg 和 Mn 等)固溶体和 TinO2n−1 等导致铁离子活
度降低的物相,使钛铁矿的还原难度加大,而且还原产物的结构和 Mg 在未反应内核处的富集都阻碍了攀枝花钛
铁矿精矿的进一步还原。
关键词:钛铁矿;固态还原;动力学;微观机理
中图分类号:TF533 文献标志码:A 文章编号:1672−7207(2010)05−1639−06

Solid-state reduction behavior of Panzhihua ilmenite

GUO Yu-feng, YOU Gao, JIANG Tao, QIU Guan-zhou

(School of Minerals Processing and Bioengineering , Central South University, Changsha 410083, China)

Abstract: The macrodynamics of solid-state carbonthermic reduction of Panzhihua ilmenite and the mineral phases
transformation and microstructure change of reduction products were researched, and the solid-state carbonthermic
reduction behavior of Panzhihua ilmenite was also researched. The results show that the reduction rate of ilmenite is low,
and the reduction reaction is controlled by interfacial chemical reaction and apparent activated energy of reaction is
kJ/mol at 1 000−1 150 ℃. The M3O5 (M is Fe, Ti, Mg, Mn, etc) solid solution and TinO2n−1 are found