Effect of Al2O3 on the Composition and Microstructures of Crystal Products of CaO-Fe2O3 Melt
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摘要: 通过在CaO-Fe2O3熔体中添加Al2O3,研究了不同Al2O3含量对CaO-Fe2O3熔体结晶矿物组成及显微结构的影响。研究结果表明,随着Al2O3含量的增加,CaO-Fe2O3-Al2O3熔体结晶产物中铁酸一钙含量减少。当Al2O3含量达到3%时,铁酸二钙与富铁铁酸钙从熔体中结晶,二者含量随Al2O3含量的增加而增加。随着Al2O3含量的增加富铁铁酸钙的显微结构向细条状转变。同时,熔体黏度随着Al2O3含量增加而增加,当Al2O3含量超过5%时,熔体内铁酸钙结晶受到显著抑制。Abstract: As one of major burdens of blast furnace,the metallurgical performance of high basicity iron ore sinter is highly related to the ironmaking process in blast furnace..In this study,the effect of Al2O3 on the composition and microstructures of crystal products of CaO-Fe2O3 melt was investigated by changing the Al2O3content in CaO-Fe2O3 melt.It was found out that the CaFe2O4 decreased with increasing Al2O3 content.When Al2O3 content reached 3%,Ca2Fe2O5 and Fe-rich calcium ferrite crystallized from melt and their content increased with increasing Al2O3 content.The microstructure of Fe-rich calcium ferrite became thinner with increasing Al2O3 content.The viscosity of CaO-Fe2O3 melt was also increased with increasing Al2O3content.When the Al2O3 content exceeded 5%,the crystallization of calcium ferrite was depressed significantly.
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Key words:
- iron ore sinter /
- calcium ferrite crystallization /
- mineral composition /
- microstructure
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