High-gradient intense magnetic field horizontal composite magnetic gathering roller

Abstract

The invention provides a high-gradient strong magnetic field horizontal composite magnetism-converging roller, which comprises a magnetic roller mandrel and a magnetic yoke drum on the magnetic roller mandrel, wherein the magnetic yoke drum is provided with primary dovetail grooves which are axially arranged in parallel and are used for fixing double dovetail shaped permanent magnetic strips; each double dovetail shaped permanent magnetic strip is formed by combining an upper dovetail shaped part and a lower dovetail shaped part; the lower dovetail shaped part is embedded in each primary dovetail groove; the upper dovetail shaped part extends out of each primary dovetail groove; a secondary dovetail groove is formed between adjacent upper dovetail shaped parts; a single dovetail shaped permanent magnetic strip is embedded in each secondary dovetail groove; magnetic poles of the single and double dovetail shaped permanent magnetic strips are positioned on two sides of dovetail shaped sections of the single and double dovetail shaped permanent magnetic strips; and the single dovetail permanent magnetic strip has the same magnetic polarity as adjacent double dovetail shaped permanent magnetic strips on both sides. The high-gradient strong magnetic field horizontal composite magnetism-converging roller can sufficiently play the effect of all magnetism peaks in a magnetic system combination, effectively improve ore dressing grade and yield, and has the advantages of simple structure, easy manufacture, safety and reliability and long service. The roller is applicable to a common magnetic extractor, and is particularly applicable to a magnetic extractor with a super-large diameter magnetism-collecting roller so as to multiply capability of ore dressing.

Description

technical field [0001] The present invention relates to a dry or wet magnetic separator for sorting weakly magnetic metal ore powder or for impurity removal and purification of non-metallic ore powder by using a permanent magnet magnetic source, specifically a high-gradient magnetic separator for the above-mentioned magnetic separator. Strong magnetic field horizontal composite magnetic gathering roller. Background technique [0002] At present, permanent magnet mineral processing equipment has been widely used in mineral metallurgy, chemical industry, environmental protection and other fields due to its advantages of low energy consumption, low cost, convenient operation and wide application range. In the past ten years, with the continuous improvement of rare earth NdFeB high magnetic energy level materials, many weak magnetic materials have entered the field of magnetic separation. In various dry or wet magnetic separators, the energy level of the magnetic source materia...

AI Technical Summary

Problems solved by technology

However, if the magnetic energy level of the magnetic roller is increased by reducing the distance between the circular magnetic sheet or the fan-shaped magnetic sheet assembly and the external excitation body, it will obviously affect the output of magnetic separation; The thickness of the sheet is used to reduce the average distance between the magnetic peak and the selected mineral powder, and it will be limited by the high brittleness of the magnetic material and the difficulty in processing and forming.

[0005] On the other hand, the axial combination structure of circular magnetic sheets or fan-shaped magnetic sheets will bring many difficulties when producing large-diameter high-gradient strong magnetic field (above 2 Tesla) magnetic accumulation rollers: not only the larger magnetic When the pressure of the material is reduced during die-casting, the density of the magnetic material will be insufficient, which will affect its magnetic energy level; and when the diameter of the circular magnetic sheet or fan-shaped magnetic sheet exceeds 400mm, the overflowing magnetic force will also decrease significantly, resulting in its magnetic separation ability. unable to grow synchronously

[0006] Third, when the circular magnetic pieces or fan-shaped magnetic pieces are combined in the axial direction, the fixation between adjacent magnetic pieces is completely dependent on the organic adhesive material. Under the aging of the adhesive material and strong internal stress, the magnetic pieces are easy to fall off , resulting in a significant decrease in its service life

[0007] Fourth, during the bonding process of circular magnetic sheets or fan-shaped magnetic sheets, it is difficult to control due to the large repulsion effect of the magnetic force. The surface is also very difficult to smooth, and the outer circle must be finished. However, the magnet material is limited by the Curie temperature, so it cannot be turned and milled. It can only be ground with a large grinding machine. seeking, and the grinding speed is very slow, resulting in low processing efficiency and high production costs

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