Influence of Carbon Addition on Mineralogical Structures and Metallurgical Properties of Sinter Prepared with Fine-grained Hematite Concentrates
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摘要: 对不同配碳量条件下的细粒赤铁精粉烧结矿矿相结构及冶金性能进行了系统研究。结果表明,当细粒赤铁精粉(司家营铁精粉)配加量为100%时,随着配碳量的增加,烧结矿显微结构逐渐均匀化,赤铁矿及硅酸二钙含量降低。当细粒赤铁精粉配比为50%~90%时,随配碳量增加,烧结矿转鼓指数先增加后降低;当细粒赤铁精粉增加到100%,随配碳增加转鼓指数提高。随配碳量的增加,低温还原粉化指数有所改善,还原度略有降低。烧结原料中随司家营铁精粉配加量的的增加,相应的配碳量应适当提高。Abstract: The mineralogical structures and metallurgical properties of sinter prepared with fine-grained hematite concentrates and different amount of carbon were systematically studied.The results show that where the proportion of Sijiaying iron ore is 100%,with the increase of carbon content,the mineralogical structures of the sinter homogenize gradually,and the contents of hematite and dicalcium silicate decrease.Where the proportion is 50%~90%,the drum index of sinter increases before decreases with the increase of carbon content; Where the proportion rises to 100%,the drum index of sinter increases.The low-temperature RDI and the reducibility of the sinter improve and decrease respectively with the increase of carbon content.The content of carbon should be increased with the increase of Sijiaying iron ore's proportion in raw materials for sintering.
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Key words:
- sinter /
- carbon addition /
- fine-grained hematite /
- mineralogical structure /
- metallurgical property
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