Thermodynamic studies on behavior of newly formed metallic iron on surface of particles

Zhan DU

doi:10.11949/0438-1157.20190931

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Thermodynamic studies on behavior of newly formed metallic iron on surface of particles

Thermodynamics | 更新时间：2020-06-24

- Thermodynamic studies on behavior of newly formed metallic iron on surface of particles
- CIESC Journal Vol. 70, Issue 11, Pages: 4143-4152(2019)
- 作者机构：
  
  Information Research Institute of the Ministry of Emergency Management, Beijing 100029, China
- 作者简介：
- 基金信息：
- DOI：10.11949/0438-1157.20190931
  CLC： TQ 021.2
- Received：13 August 2019，
  
  Revised：2019-09-16，
  
  Published：05 November 2019
- 稿件说明：
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杜占. 颗粒表面金属铁析出规律的热力学研究[J]. 化工学报, 2019, 70(11): 4143-4152

DU Zhan. Thermodynamic studies on behavior of newly formed metallic iron on surface of particles[J]. CIESC Journal, 2019, 70(11): 4143-4152
杜占. 颗粒表面金属铁析出规律的热力学研究[J]. 化工学报, 2019, 70(11): 4143-4152 DOI： 10.11949/0438-1157.20190931.

DU Zhan. Thermodynamic studies on behavior of newly formed metallic iron on surface of particles[J]. CIESC Journal, 2019, 70(11): 4143-4152 DOI： 10.11949/0438-1157.20190931.

摘要

从热力学角度出发，揭示了还原条件对高温气基还原过程中颗粒表面铁析出行为的影响规律，提出了通过改变还原气氛调控铁析出形貌的操控方法。研究表明在CO中混入H

可以加快铁晶粒的生长速率，同时增加还原初期矿粉表面的铁形核数量，导致矿粉表面新生成的金属铁由晶须状转变为致密状。随着CO-CO

中CO

含量的升高，矿粉表面新生成的金属铁会由“锋利”的晶须状转变为“仙人掌状”，并且表面铁的分布密度会变小。随着还原温度的降低，矿粉表面铁晶须的强度会变弱。

Abstract

The influence of reduction conditions on the morphology of newly formed metallic iron during high temperature gas-based reduction of iron ore are studied from the standpoint of thermodynamic analysis

and the solutions for controlling iron morphology through regulation of reduction conditions are proposed. Experimental results showed that addition of H

in CO could not only accelerate the growth rate of iron grains

but also increase the amounts of iron nuclei

resulting in the transformation of fibrous iron into dense one

addition of CO

in CO could transform the“sharp-pointed”iron whiskers into“cactus-like”ones

decrease of reduction temperature could lower the strength of fibrous iron.

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references

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