beneficiation of carbonate iron ores

Siderite beneficiation is challenging, because of the low iron content of the ore compared to magnetite and hematite ores. The industrial practice is to blend siderite with other high-grade ores in the sinter plant. 15,16 During the sintering process, siderite is converted to hematite Fe 2 O 3 through roasting in air according to eqn (1) .