Abstract
Siderite is an important iron ore resource. The magnetization roasting is one of the most effective means to achieve efficient utilization of the low grade siderite-containing iron ore. Experimental results show that, under the conventional reduction magnetization conditions of 500 °C and 550 °C with gas reduction potential 0.45, siderite will be reduced to weak magnetic wüstite. In this paper, the two generation stages of wüstite in the siderite reduction process are clarified. Under the conditions of the gas reduction potential ≤ 0.2 at 550 °C and ≤ 0.1 at 600–800 °C, the stable existence of magnetite from the reduction of siderite can be achieved without being further reduced to wüstite. A low gas reduction potential magnetization roasting process is proposed for the utilization of refractory siderite-containing iron ore, with an optimal parameter 550 °C for 7.5 min and gas reduction potential 0.2. The process can realize the simultaneous complete magnetization roasting of siderite and hematite to magnetite, and avoid the formation of wustite while satisfying the reduction of hematite, which has wide applicability. For Shaanxi low-grade siderite ore, compared with the conventional magnetization roasting process, the iron recovery rate of weak magnetic separation is greatly improved by 34.89%.
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