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Fundamentals of the Reduction of SFC in CO/CO2 Gas at 1000°C
ISIJ International ( IF 1.6 ) Pub Date : 2020-10-20 , DOI: 10.2355/isijinternational.isijint-2020-064
Xin Jiang 1 , Jiaxin Yu 1 , Lin Wang 2 , Tengyu He 1 , Haiyan Zheng 1 , Qiangjian Gao 1 , Fengman Shen 1
Affiliation  

SFC (Sillico-Ferrite of Calcium) is a kind of simplified SFCA (Sillico-Ferrite of Calcium and Aluminum) with no Al2O3. SFC and SFCA are believed to be the most desirable bonding phase in sinter. In order to better understand the fundamentals of the reduction of SFC, a series of experiments on the SFC reduction were carried out in the present work, including phase equilibria tested by XRD, morphology tested by SEM-EDS, and reduction pathway under the different CO/CO2 mixture gas at 1000°C. The experimental results indicated, (1) in the case of CO = 20% and 40%, most of Fe2O3 in SFC was reduced to FeO. The equilibrium phases were FeO, CaO·Fe2O3, and CaO·SiO2. (2) In the case of CO = 60%, CaO·Fe2O3 was reduced to generate FeO and 2CaO·Fe2O3. The equilibrium phases were FeO, 2CaO·Fe2O3, and CaO·SiO2. (3) In the case of CO = 80% and 90%, FeO was reduced to Fe, and 2CaO·Fe2O3 was reduced to generate Fe and CaO. The equilibrium phases were Fe, CaO, and CaO·SiO2. The findings from this work may provide guidelines for the improvement of sintering production and blast furnace performances.

Schematic diagram of the reduction pathway of SFC. Fullsize Image


中文翻译:

1000°C下还原CO / CO2气体中SFC的基本原理

SFC(钙硅铁素体)是一种不含Al 2 O 3的简化SFCA(钙铝硅铁素体)。人们认为SFC和SFCA是烧结矿中最理想的粘结阶段。为了更好地了解SFC还原的基本原理,本文进行了一系列的SFC还原实验,包括XRD测试的相平衡,SEM-EDS测试的形态以及不同CO下的还原途径。 / CO 2混合气体在1000°C下。实验结果表明:(1)在CO = 20%和40%的情况下,SFC中的大部分Fe 2 O 3还原为FeO。平衡相为FeO,CaO·Fe 2 O 3和CaO·SiO2。(2)在CO = 60%的情况下,将CaO·Fe 2 O 3还原而生成FeO和2CaO·Fe 2 O 3。平衡相为FeO,2CaO·Fe 2 O 3和CaO·SiO 2。(3)在CO = 80%和90%的情况下,FeO被还原成Fe,并且2CaO·Fe 2 O 3被还原而生成Fe和CaO。平衡相为Fe,CaO和CaO·SiO 2。这项工作的发现可能为提高烧结产量和高炉性能提供指导。

SFC还原途径的示意图。全尺寸图片
更新日期:2020-10-28
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