Electromagnetic elutriation and selection machine

Abstract

The invention discloses an electromagnetic elutriation fine separation machine. The electromagnetic elutriation fine separation machine comprises a separation tube, a feeding device is arranged on the separation tube, a water inlet device is arranged outside the separation tube in a communicated mode, the separation tube is sleeved with an electromagnetic coil which comprises a circulation coil in the middle, and the electromagnetic coil further comprises two fixed coils which are vertically stacked at the top and used alternatively. According to the electromagnetic elutriation fine separation machine, the grade of tailings is low, the recovery rate of concentrate is high, feeding is even, and the overflow liquid level is stable.

Description

technical field [0001] The invention relates to the technical field of magnetic separator equipment, in particular to an electromagnetic elutriation and selection machine. Background technique [0002] The equipment used to improve the grade of concentrate in the magnetite concentrator mainly includes conventional permanent magnet drum magnetic separator, magnetic concentrator, magnetic separation column, and elutriation magnetic separator. However, these existing magnetic separation equipments have more or less defects: the conventional permanent magnetic drum magnetic separator has obvious magnetic agglomeration phenomenon in the beneficiation process, and the range of improving the concentrate grade is limited; the magnetic field of the magnetic agglomerator is constant and cannot Adapt to the requirements of different ore properties and concentrate grades, and have defects such as running tails; every time the entire set of excitation coils of the magnetic separation col...

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Problems solved by technology

However, these existing magnetic separation equipments have more or less defects: the conventional permanent magnetic drum magnetic separator has obvious magnetic agglomeration phenomenon in the beneficiation process, and the range of improving the concentrate grade is limited; the magnetic field of the magnetic agglomerator is constant and cannot Adapt to the requirements of different ore properties and concentrate grades, and have defects such as running tails; every time the entire set of excitation coils of the magnetic separation column changes for one cycle, there will be a non-magnetic area in the upper overflow area, which will easily cause the overflow tailings to have higher magnetic iron grades. Affect concentrate recovery

Because the fixed coil is always energized, the adsorbed ferromagnetic minerals will become thicker and thicker, which is not conducive to the continued adsorption of ferromagnetic minerals in the later stage

[0006] At the same time, when the weight of the ferromagnetic minerals adsorbed is greater than the suction force of the magnetic field and the momentum of the rising water, they will slide down along the inner wall of the elutriation machine as a whole. During the sliding process, because the stable sorting environment inside the elutriation machine is destroyed, it will Most of the missing and chained iron ore minerals are washed out by the rising water flow, resulting in sudden overflow, causing intermittent fluctuations in the overflow liquid level, unstable overflow liquid level, and not conducive to effective tail control , leading to an increase in the magnetic iron content of the tailings, an increase in the grade of the tailings, and a decrease in the recovery rate of the concentrate

Therefore, the elutriation magnetic separator with only one fixed coil control mode is difficult to reasonably and effectively tail some mines, resulting in higher tailings grade, lower concentrate recovery rate, less stable control, and affected economic benefits.

[0007] At present, the diameter of the feeding pipe of the feeder of the elutriation magnetic separator is relatively small, generally equal to or smaller than the diameter of the closed inner cylinder, because the closer to the shaft diameter of the separation cylinder, the weaker the magnetic field strength, so the closer to the feeder The magnetic iron in the feed pipe is less likely to be captured by the magnetic field, resulting in an increase in the content of magnetic iron in the overflow tailings, which also results in higher tailings grades and lower concentrate recovery rates.

In addition, after the magnetite powder enters the feeder of the elutriation magnetic separator, it overflows directly from the drop pipe at the lower part of the feeder. After the material enters the sorting cylinder in this way, the bulk material is not uniform, which is not conducive to elutriation magnetic separation. Machine-to-concentrate beneficiation

[0008] In addition, the elutriation magnetic separator also has problems such as large water consumption, and the influence of the selection effect when the feed fluctuates.

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