Preparation and characterization of porous magnetic steel slag abrasives

To effectively solve the problems of environmental pollution and resource waste caused by steel slag and open up a new field of application of steel slag, the porous magnetic steel slag abrasive was prepared by combining the gas quenching process with steel slag as the main raw material. Besides, and the micro-morphology, the pore structure, the magnetic properties, the mechanical properties and the abrasive properties of steel slag abrasive were characterized by field emission scanning electron microscope, high-performance automatic mercury porosimeter, magnetometer, etc. The results show that the steel slag abrasive is monodisperse spherical, and there are disordered pores arranged in round or elliptical shape on its surface and cross section. The porosity of abrasive sample is 37% to 45%, and the pore volume is 0.18 to 0.23 mL/g. Under the action of external magnetic field, with the increase of the particle size of the abrasive sample, its hysteresis loop shifts clockwise and presents a narrow “S” type closed curve. The abrasive sample shows typical ferrous magnetism, which can effectively improve the surface quality of aluminum alloy workpiece, and the surface roughness R_a of the workpiece is reduced from 3.2 µm to 0.7 µm.