METHOD FOR GRINDING MATERIALS IN ROTATING DRUM USING FERROMAGNETIC GRINDING BODIES

摘要

The invention relates to a method for grinding materials, and can be used in processes for preparing raw materials for enrichment, and also in the building, chemical and other branches of industry. The grinding of materials is carried out in a rotating drum which is partially filled with ferromagnetic grinding bodies; a magnetic force from at least one electromagnet is applied to the grinding bodies, said electromagnet being affixed to the drum, and the magnetic field is formed of at last two separate pulses. The first pulse is separated into a series of shorter pulses, wherein the first pulse is characterized by an alternating magnetic field, and is applied beginning at an angular position of the electromagnet of -60° to -30°, counting the central angle from a vector which is directed vertically downward from the rotational axis of the housing. The second pulse is characterized by a constant magnetic field, and is applied beginning at an angular position of the electromagnet of 0° to +30°, and ending at an angular position of the electromagnet of 110° to 165°. The invention provides for increased energy efficiency during the process of grinding materials in ball mills.