Pilot Study on the Recovery of Iron from High-Iron Red Mud by Vortex Smelting Reduction

In order to realize theHigh-iron red mud large-scale resourcefulness and harmless utilization of high-ironIron red mudRed mud, a pilot-scale experiment on vortex smelting reductionVortex smelting reduction of high-ironIron red mudRed mud was conducted using conditions determined on the basis of laboratory research. The pilot studyPilot study achieved good results. The ironIron recoveryRecovery was 97.12%, and a pig ironPig iron product containing 93.27 wt % ironIron was obtained. The experimental conditions included a temperature of 1500 °C, a carbon ratio of 1.3, a holding time of 30 min, a stirring speedSpeed of 125 rpm, an alkalinity of 1.0, and fluorite was used as a co-solvent at 10% of the calcium oxide addition. The concentrations of P and S in the pig ironPig iron were low, which allowed them to meet the requirements of the national standard L03 for steelmaking. The main phases in the reduction slag were gehlenite, calcium titanate, and nepheline, which were effective components for cement clinker production.