Abstract: In order to resolve the flotation issues of iron ores containing high content of ferric carbonates in Dong'anshan Iron Ore, the nature floatability of pure minerals including martite, magnetite, siderite and quartz in sodium oleate flotation system were investigated, and the effects of CaCl₂, starch and the compound regulatant of CaCl₂ and starch on flotation of the pure minerals were studied as well. The results showed that with the compound regulatant of CaCl₂ and starch, siderite was separated firstly in neutral condition, partly removing the effect of siderite on flotation, and then the reverse flotation was adopted to separate quart at high pH value condition. Therefore, the separation of iron ore containing high content of ferric carbonates in Dong'anshan by flotation was achieved.

Key words: Martite, Siderite, Quartz, Sodium oleate, CaCl₂, Starch, Floatability