权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Dynamic Behavior of Sulfur in Rapid Smelting Redution of Carbon-Coated-Iron Ore

硫在碳包铁矿快速熔炼还原中的动态行为

基本信息

批准号：
08650904
负责人：
SUGAWARA Katsuyasu
金额：
$ 1.47万
依托单位：
Akita University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1997
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08650904/
关键词：
smelting reduction iron ore sulfur drop-tube reactor kinetics 急速熱分解

项目摘要

As one of the new iron-making processes for the next century, direct-iron-ore-smelting reduction process is now attracting a great deal of attention in which noncaking coal and iron ore powder can be used directly without coke oven. Development of direct-iron-ore-smelting reduction process requires accurate understanding of reaction mechanism and kinetic evaluation in melting condition.As a part of fundamental study on the kinetics of rapid smelting reduction of iron oxide with solid carbon, particles of carbon-coated-iron ore were prepared by heating of mixture of iron ore and phenolphthalein as a model compound of coal tar at 773 K in an nitrogen stream. Reduction behavior of carbon-coated-iron ore particles during rapid heating has been observed by using a drop-tube reactor in a nitrogen stream at temperatures from 1073 K-1860 K.The change in iron forms during rapid heating was successfully simulated and kinetic parameters of successive reaction for metallic iron formation from hematite via wustite were determined. The carbon-coated-iron ore with sulfur addition was also prepared and sulfur distribution was investigated during rapid smelting reduction. The experimental results showed that sulfur existed as FeS in molten iron phase and formation of metallic iron was retarded by sulfur addition to solid carbon.

作为下世纪炼铁新工艺之一，铁矿石直接熔炼还原工艺由于不结焦煤和铁矿粉无需焦炉而直接使用，目前受到广泛关注。铁矿石直接熔炼还原工艺的发展需要准确理解反应机理和熔融条件下的动力学评估。作为固体碳快速熔炼还原氧化铁动力学基础研究的一部分，通过将铁矿石和酚酞混合物作为煤焦油的模型化合物在氮气流中加热到773 K，制备了碳包覆铁矿石颗粒。利用落管式反应器，在氮气流中，在1073 K-1860 K的温度下，观察了碳包覆铁矿石颗粒在快速加热过程中的还原行为。成功地模拟了快速加热过程中铁形态的变化，并确定了赤铁矿到维氏体形成金属铁的连续反应的动力学参数。还制备了添加硫的碳包覆铁矿石，并研究了快速熔炼还原过程中硫的分布。实验结果表明，硫以FeS的形式存在于铁水相中，并且向固体碳中添加硫阻碍了金属铁的形成。