Influence of Coating MgO on Sticking and Functional Mechanism during Fluidized Bed Reduction of Vanadium Titano-magnetite

被引：15

作者：

Guo, Lei ^{[1
]}

Yu, Jin-tao ^{[1
]}

Tang, Jing-kun ^{[1
]}

Lin, Yin-he ^{[1
]}

Guo, Zhan-cheng ^{[1
]}

Tang, Hui-qing ^{[1
]}

机构：

[1] Univ Sci & Technol Beijing, State Key Lab Adv Met, Beijing 100083, Peoples R China

来源：

JOURNAL OF IRON AND STEEL RESEARCH INTERNATIONAL | 2015年 / 22卷 / 06期

基金：

中国国家自然科学基金;

关键词：

fluidized bed; sticking; oxide coating; iron ore fine; vanadium titano-magnetite; DOPED FE2O3 COMPACTS; 1173-1473; K; IRON-ORES; BEHAVIOR; PARTICLES; MAGNESIUM; FERRITE; OXIDE; CO;

D O I：

10.1016/S1006-706X(15)30028-5

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

The vanadium titano-magnetite (VTM) iron ore fines of 110-150 pm in diameter were reduced in a transparent quartz fluidized bed by 70%CO-30%H-2 (volume fraction) mixtures. MgO powders served as coating agent to solve sticking problem. Two coating methods were introduced in this experiment: high temperature injection method and briquetting -> oxidizing roast -> crushing method. According to the experimental results, the minimum effective coating amount of MgO was 0.1 mass%. The metallization ratio (MR) of the product: rose from around 58% to above 90% with the above treatments. To investigate the sticking mechanism of fine ore, the morphology evolution was investigated. Instead of iron whiskers, an interlaced fibrous porous surface formed. The ulvospinel (2FeO center dot TiO2) in VTM is more difficult to be reduced than FeO according to thermodynamic calculation. XRD results showed that MgO diffused into Fe2O3 lattice before forming pleonaste (MgO center dot Fe2O3) during oxidizing roast at 1273 K. The melting point of the pleonaste is 1986 K and that made contribution to prevent the sticking problem.

引用

页码：464 / 472

页数：9

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