Effects of Compound Silicate Gangue on Formation of Complex Calcium Ferrite During Sintering Process

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• 作者：Guo-ping LUO^a ; ^b ; ^{luoguoping3@126.com}Author Vitae ; Sheng-li WU^a ; Guang-jie ZHANG^b ; Yi-ci WANG^a ; ^b
• 关键词：kalium ; natrium ; compound silicate gangue ; sintering ; complex calcium ferrite
• 刊名：Journal of Iron and Steel Research, International
• 出版年：2013
• 出版时间：March, 2013
• 年：2013
• 卷：20
• 期：3
• 页码：18-23
• 全文大小：870 K

文摘

In order to improve the quality of sinter produced by Baiyunebo iron ore concentrate, the effects of compound silicate gangue containing kalium and natrium on formation of complex calcium ferrite were studied using minisintering test device, optical microscope (OM) analysis and scanning electron microscope (SEM)/energy dispersive X-ray spectroscopy (EDX) analysis. The results show that with the increasing of K₂O and Na2 O content in sintering samples, K₂O and Na₂O highly enriched in the glassy phases, the contents of complex calcium ferrite and hematite in sinter decreased and the porosity increased; the mineral microstructure exhibited large cavities and thin framework and became inhomogeneous. The compound silicate gangue containing kalium and natrium significantly inhibited the generation of complex calcium ferrite (SFCA). When the content of K₂O and Na₂O was higher in samples, a part of K₂O and Na₂O entered into complex calcium ferrite, which caused the fine grains of SFCA with acicular and columnar to agglomerate into coarse grains, and its bonding effect to iron oxides reduced. The content of K₂O and Na₂O in sinter had effects on quantity, composition and morphology of complex calcium ferrite.