Abstract: The iron ores produced from a mine in Gansu have a complex mineral composition, where the main iron minerals are magnetite, hematite and siderite with basically similar content and a small amount of limonite.So a single process can not reach a good index.According to the nature of ores, such processes consisting of low intensity magnetic separation-high intensity magnetic separation, low intensity magnetic separation-magnetic separation after roasting, industrial roasting-magnetic separation were focused on.The industrial roasting-magnetic separation program got relatively good indicators among three kinds of programs, and reached the application standard of being in closely proximity to the current production in Jiuquan.

Key words: Micro-fine grained mixture iron ore, Roasting, Magnetic separation