Monomer dissociation characteristics and selective recovery technology of micro-fine iron particles

This article studies the existing form of iron particles in direct reduction clinker and their selective recovery technology. It is found that the existing form of iron in tailings is micro-fine iron particles. In direct reduction clinker, the particles greater than 10μm can be recovered by magnetic separation, however those less than 5μm cannot. Considering both the grade and recovery of iron powders, it is necessary to conduct a selective recovery of different types of iron powders. Increasing the monomeric liberation of coarse intergrowths and recovering iron particles specifically from the intergrowths are the key to improve the recovery index of iron powders. Though the recovery of iron can be improved by increasing the magnetic field intensity, the quality of iron powders reduces. Technological parameters have been optimized for the separation by orthogonal test. Under the optimization condition the TFe content of iron powders and the recovery rate of iron is 92.91% and 92.03%, respectively.