Influence of Sijiaying Iron Ore on the Structure of Sinter

Microstructure and quality of sinter of Sijiaying iron ore were studied systematically by means of optical microscope. Results show that the content of sinter of different ratio of Sijiaying iron ore are simple, the content of metal phase are magnetite and hematite, binding phases mainly are calcium ferrite and dicalcium silicate, and the contents of calcium ferrite are higher. The whole microstructure of sinter is uniform, which is interweaving corroded structure. The magnetites are major tiny allotriomorphic crystal. The shape of calcium ferrite is needle-like. The quality of sinter can meet the production request when the proportions of Sijiaying iron ore are from 50% to 100%. Iron ore of Sijiaying mine belongs to Anshan-type iron deposit, and the iron ore is one of existing larger scale iron mining which has not yet developed at the present[1]. And now, because of lack of iron ore resources at home and abroad, how to make full use of the local iron ore resources, especially effective use of local higher grade of self-produced iron ore concentrates, is a arduous problem to many steel enterprises[2,3]. In order to reduce the sintering raw material costs and make full use of local resources, this paper has studied the structure and quality of sinter of different proportions of Sijiaying iron ore, which mainly provide reasonable technical parameters for production.