Skip to main content
main-content

Tipp

Weitere Artikel dieser Ausgabe durch Wischen aufrufen

06.11.2019 | Original Paper | Ausgabe 11/2019

Journal of Iron and Steel Research International 11/2019

Fundamental mechanism of effects of MgO on sinter strength

Zeitschrift:
Journal of Iron and Steel Research International > Ausgabe 11/2019
Autoren:
Hong-song Han, Feng-man Shen, Xin Jiang, Chuan-guang Bi, Hai-yan Zheng, Qiang-jian Gao

Abstract

MgO-containing flux may have a series of effects on the quality of sinter and performances of the blast furnace. Thus, the fundamental mechanism of the effects of MgO on the sinter strength was investigated. Both the chemical reagent and industrial flux were used for preparing the specimens. The experimental results show that the sinter strength decreases with MgO addition. There are three reasons for it. The first reason is diffusion rate. Almost all of the CaO may react with Fe2O3 and generate CaO·Fe2O3, but most of MgO cannot react with Fe2O3, and it still remains in the state of original minerals. The diffusion rate of MgO in iron oxide is only 17.51 μm/min in 30 min. The second reason is the fluidity and ability to generate liquid phase. In the case of Fe2O3 mixed with CaO, there is some liquid phase formed above 1200 °C, while in the case of Fe2O3 mixed with MgO, even at 1200 and 1220 °C, there is still no liquid phase. The third reason is self-strength. In the case of industrial flux, the compression strength of the specimens made of Fe2O3 and limestone is 0.52 and 0.71 kN at 1150 and 1180 °C, respectively, while that of the specimens made of Fe2O3 and magnesite is 0.48 and 0.56 kN, respectively. Therefore, the fundamental mechanism of the effects of MgO additive on sinter strength can be better understood based on the diffusion rate of MgO in iron oxides, the fluidity of liquid phase, and the self-strength of bonding phase.

Bitte loggen Sie sich ein, um Zugang zu diesem Inhalt zu erhalten

Literatur
Über diesen Artikel

Weitere Artikel der Ausgabe 11/2019

Journal of Iron and Steel Research International 11/2019 Zur Ausgabe

Premium Partner

    Marktübersichten

    Die im Laufe eines Jahres in der „adhäsion“ veröffentlichten Marktübersichten helfen Anwendern verschiedenster Branchen, sich einen gezielten Überblick über Lieferantenangebote zu verschaffen. 

    Bildnachweise