Intermediate demagnetizing machine for magnetic selected iron ore powder

Abstract

The invention relates to a medium-frequency demagnetization device which is used for magnetically selecting iron ore powder. The medium-frequency demagnetization device comprises a hollow demagnetization assembly, a hollow insulation pipe and a capacitance assembly, wherein the hollow demagnetization assembly is formed by coils and gradually attenuates from a material flowing direction; the hollow insulation pipe is axially arranged in the hollow demagnetization assembly, and both ends of the hollow insulation pipe extend outwards; the capacitance assembly is electrically connected with the coils which are arranged on the hollow demagnetization assembly; and the hollow demagnetization assembly and the capacitance assembly are combined to supply a magnetic field which gradually attenuates from the material flowing direction for the hollow position of the hollow demagnetization assembly, and the materials can be effectively demagnetized after flowing out of the hollow insulation pipe. In an iron ore powder magnetic selection technology, the ore grade and the recovery rate can be increased by 2 to 3 percent by adding the demagnetization device.

Description

Technical field: [0001] The invention relates to an intermediate frequency demagnetizer for magnetic separation of iron ore powder. Background technique: [0002] In the existing magnetite beneficiation process, the raw ore is usually crushed by a jaw crusher, then finely ground by a ball mill and polarized by a polarizer, and then the polarized iron ore powder is directly sent to the magnetic separator. Magnetic separation. Although the process of magnetic separation of iron ore powder can separate most of the iron-containing particles, because iron ore, especially the iron ore powder after polarization, also contains many non-metallic particles, while iron-containing particles still contain many non-metallic particles. Usually carrying a remanence of 100-200 oersteds, these magnetic iron-containing particles can easily gather a number of non-metallic particles around them, resulting in the phenomenon of "magnetic agglomeration", and the particles with magnetic agglomerati...

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Problems solved by technology

[0007] The task of the present invention is to provide a medium frequency demagnetizer for magnetically separated iron ore powder, which solves the problems of waste of energy, low output, and unsatisfactory demagnetization effect by using two methods: the natural flow of the magnetically separated material and the gradual attenuation of the magnetic field intensity.

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