China Nonferrous Metallurgy

The iron oxide content of high-iron red mud is more than 30%, which is an important source of iron resources.In order to realize the large-scale, resourcefulness, and harmless utilization of high-iron red mud, a pilot-scale experiment on vortex smelting reduction of high-iron red mud was conducted in this paper on the basis of laboratory research. The pilot study achieved good resultswith the use of industrial reagents instead of analytically pure laboratory reagents. The iron recovery was 97.12% under the experimental conditions of the experimental temperature of 1500℃, the carbon ratio of 1.3, the holding time of 30 minutes, the stirring speed of 125r/min, the alkalinity of 1.0, and the amount of calcium fluoride was 10% of the amount of calcium oxide. The content of P and S in the pig iron was low, which can meet the requirements of the national standard L03 for steelmaking. The main phases in the reduction slag are gehlenite, calcium titanate, and nepheline, which are effective components for cement clinker production. The pilot-scale experiment on vortex smelting reduction of high-iron red mud can provide relevant data for large-scale industrial applications and has great guiding significance. Currently the production is in intermittent mode. In the future, continuous charging, continuous slagging and iron production can be realized by designing a continuous reaction unit.