Method of magnetic dressing in sign-variable gradient magnetic fields and device to this end

FIELD: process engineering.

SUBSTANCE: invention relates to magnetic dressing of ores. Proposed method comprises extracting magnetic mineral grains from pump, carrying them by rotary nonmagnetic drum relative to permanent magnets arranged inside said drum that have magnetic polarity alternating in direction of rotation. Note here that floccules swing without separation from drum surface for partial separation of nonmagnetic inclusions. Magnetic system ensures periodical separation of magnetic fraction from drum surface in radial direction, hence, intensive destruction of magnetic floccules and efficient cleaning of magnetic concentrate from nonmagnetic impurities.

EFFECT: higher quality of concentrate.

2 cl, 1 dwg

 

The invention relates to the field of magnetic ores.

The aim of the invention is to improve the quality of the concentrate by removing undisclosed grains, rotkovich particles and impurities, magnetic dilution of the concentrate.

Known methods and devices for their implementation, used for mineral mixes the wet method includes feeding the pulp into the tub, the Department under the action of the permanent magnets of the magnetic particles from non-magnetic, pressing their magnetic forces to the surface of a rotating magnetic drum, move to the unloading area and partial purification from non-magnetic impurities due to the magnetization reversal and reversal of the magnetic flocs (strands) during their movement on the drum surface as it moves relative to the inboard stationary permanent magnets with alternating magnetic polarity [Handbook"ore". "Basic processes". Edited by Bogdanov, M., Nedra, 1983, page 172,175].

The design features of magnetic systems depend on the properties of the processed materials [Karmazin CENTURIES, Karmazin V. "Magnetic, electrical and special methods of mineral processing. M., Publishing house of Moscow state mining University, 2005 Volume 1, str, 512].

The closest analogue (prototype) of the claimed method and device for its accomplished what I have is the way, implemented in drum magnetic separator comprising a non-magnetic drum mounted rotatably located inside the drum magnet system is made of permanent magnets in the form of rectangular prisms with cross-cutting circular holes located along the Central axis of the prism (A.S. SU # 1286288 A1, VC 1/10).

The disadvantage of this method and device for its implementation is the inability to obtain high-quality concentrates.

The aim of the invention is to improve the quality of the concentrate with magnetic separation, reducing the process load on the equipment and cost by reducing the number of repeated cleanings.

This objective is achieved in that in the method of magnetic enrichment, including the filing of the original material in the form of a slurry from the bottom of the drum, the attraction of particles with magnetic properties to the surface of the rotating drum, the transport of the magnetic fraction in zone peredishki and unloading, it is new that the cleaning of the magnetic material from nonmagnetic impurities is carried out by periodic drop them in the radial direction from the drum surface with the subsequent return. When this occurs the destruction of the magnetic flocs, "opolaskivanie" from nonmagnetic impurities obrazovanie new flocs.

The proposed technical solution for the implementation of a new method of magnetic separation, is the device of the magnetic system, providing education on the drum surface of the separator areas in which the maximum magnetic field strength is at a distance of 30-40 mm from the magnetic system. When moving the separated product through this area is garbage magnetic product due to a change of the sign of the gradient of the magnetic field on the opposite. When you exit this area and return the cleaned magnetic product to the surface of the drum.

The result, on the achievement of the aims of the proposed method and the technical solution to implement, is to improve the quality of concentrate.

This result is achieved due to the fact, in the wet method magnetic ore enrichment with magnetic minerals, including removing grains of magnetic minerals from the pulp, move them using a rotating magnetic drum relative to the inside of the drum of permanent magnets with alternating direction of rotation of the magnetic polarity, thus there is a coup (rolling) of flocs without separation from the drum surface with partial clearing of non-magnetic inclusions, it is new that the proposed magnetic system of especial periodic garbage magnetic fraction from the drum surface in the radial direction, in which there is intense destruction of magnetic flocs and effective cleaning of the magnetic concentrate from non-magnetic impurities, and a device for wet magnetic enrichment of finely ground ore with magnetic minerals, including non-magnetic drum rotatably around a horizontal axis mounted inside on a stationary yoke magnetic system with magnetic blocks, magnetized along the radii, system loading and unloading of the separated products, what's new is that the magnetic system is implemented as two or more rows of magnets with the same magnetic polarity in the direction of movement of the pulp and magnetic wedges between rows of the same polarity with smaller magnetic induction in the area of peredishki and rows of magnets and pins with the opposite magnetic polarity in the area to extract.

Figure 1 schematically shows a General view of the device.

Magnetic separator includes mounted for rotation on an axis 1 non-magnetic drum 2, bath 3, the channel load 4, the device for flushing the magnetic concentrate 5, channel discharge 6 and the nonmagnetic tailings 7.

On the yoke 8 contains the main magnets of barium ferrite, grouped in rows a-h with the same magnetic polarity in the series. Located between the main magnets of the series B and magnetic the e wedges have opposite magnetic polarity on the main magnets, and magnetic wedges in the ranks of the G, D, E of the same name (magnetic induction is directed normally to the surface of the drum). Between the rows a-B; B -; C-G; G-D; D-E; E-W magnetic wedges tangentially magnetized in the direction of the blocks with the polarity - N. Magnetic induction wedges 30-50% of the induction of the main magnets.

Works separator as follows.

Source food in the form of slurry enters the tub through the channel 4. Under the action of magnetic forces and pressure jet of pulp supply the main part of the magnetic particles is pressed against the surface of the drum and with him moved to the unloading area concentrate 5. The remaining part is moved in the direction of the discharge zone, under the influence of magnetic forces is the additional extraction of the magnetic product. Thanks to the proposed magnetic system using the related series of the main magnetic blocks and located between the magnetic wedges with the same magnetic polarity increases by 30-40% of the depth of the extract, which helps to increase the performance of the separator. Between the rows of blocks are formed of the zone in which the maximum magnetic field strength is not located on the surface of the drum, and at a distance of 30-40 mm from it in the radial direction. Changing the direction of the magnetic field gradient leads to isolation (bounce) magnitnykh particles, the destruction of flocs and "rinse" them from nonmagnetic impurities to produce more high quality magnetic concentrate.

Thus, the inventive method magnetic enrichment in magnetic fields with alternating gradient and device for its implementation allow:

to increase the performance of the separator by increasing the depth of extraction;

- effectively destroy the magnetic conglomerates, strands and flocculi;

to provide a higher selectivity of separation of the products of the separation.

1. The wet method magnetic ores containing magnetic minerals, including removing grains of magnetic minerals from the pulp, move them using a rotating magnetic drum relative to the inside of the drum of permanent magnets with alternating direction of rotation of the magnetic polarity, thus there is a coup (rolling) of flocs without separation from the drum surface with partial clearing of non-magnetic inclusions, characterized in that the proposed magnetic system provides periodic garbage magnetic fraction from the drum surface in the radial direction, in which there is intense destruction of magnetic flocs and effective cleaning of the magnetic concentrate from non-magnetic impurities.

2. Wet magnetic obog is of finely ground ore with magnetic minerals, including non-magnetic drum rotatably around a horizontal axis located inside on the fixed yoke magnetic system with magnetic blocks, made in the form of rectangular prisms, magnetized along the radii, the system of loading and unloading of the separated products, characterized in that the magnetic system is implemented as two or more rows of magnets with the same magnetic polarity in the direction of movement of the pulp and magnetic wedges between rows of the same polarity with smaller magnetic induction in the area of peredishki and rows of magnets and pins with the opposite magnetic polarity in the zone of the extract.



 

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