Influence of Carbon Addition on Mineralogical Structures and Metallurgical Properties of Sinter Prepared with Fine-grained Hematite Concentrates

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.