RU2344879C1 - Drum magnetic separator - Google Patents

Abstract

FIELD: engines and pumps; mining.

SUBSTANCE: invention is used for processing of unsized material with fineness of up to 250 mm. Drum magnetic separator comprises non-magnet rotary drum, magnetic system installed inside drum, feeder and receiver. Magnet system is made of permanent magnet plates of neodymium-iron-boron, which are assembled in the first quarter of drum in the form of rings with alternating magnetic polarity along drum width. In the second quarter magnetic system is also arranged from permanent magnet plates of neodymium-iron-boron. They are assembled in the form of magnet rows with alternating magnetic polarity in the direction of material movement, with alternating pole pitch from 120 mm to 60 mm and possibility to combine separate plates in blocks.

EFFECT: higher efficiency of large-sized unclassified ore separation process, high selectivity of coarse grain products separation in the first quarter of drum, magnetic transport of coarse and selection of fine ones in the second quarter of drum.

1 cl, 2 dwg

Description

The invention relates to the field of magnetic beneficiation of magnetite ores and can be used for processing unclassified material with a particle size of up to 250 mm

A known electromagnetic separator comprising a non-magnetic drum and an open combined radial-type electromagnetic system located inside the drum [RF, a.s. No. 668706, IPC V03s 1/10, publ. 06/25/79, bull. No. 23].

The disadvantage of this magnetic separator is the presence of electromagnets, low magnetic field strength and significant power consumption.

The closest technical solution is a magnetic separator with an adjustable magnetic system, including a mechanism for changing the position of the blocks relative to the axis of the non-magnetic drum [RF, a.s. No. 1153987, IPC V03s 1/10, publ. 04/07/83, bull. No. 17, (prototype)].

The disadvantages of this separator are the low magnetic field induction on the surface of the non-magnetic drum: 0.11-0.12 T with a maximum number of magnetic plates in the working block - 6 pcs, with a decrease in the number of plates to 3 pcs - 0.035-0.04 T, and complex kinematics when changing the position of the rows relative to the surface of the drum, as well as a limited scope.

The technical result of the invention is to increase the efficiency of the separation process of lumpy unclassified ore, the high selectivity of the separation of products of large fractions in the first quarter of the drum, as well as magnetic transport of large and selection of small in the second quarter of the drum.

The specified technical result is achieved in that in a magnetic separator containing a non-magnetic rotating drum and a magnetic system located inside the drum, a feeder and a receiver, it is new that the magnetic system is made of neodymium iron pickup permanent magnets assembled in the first quarter of the drum in the form of rings with alternating magnetic polarity across the width of the drum, in the second quarter the magnetic system is also made of plates of permanent magnets neodymelezobor collected in the form of magnetic rows with black driven by magnetic polarity in the direction of movement of the material, with a variable pole pitch from 120 mm to 60 mm and the possibility of combining individual plates into blocks.

In the magnetic separator, the magnetic system is made of permanent magnets in the form of rectangular prisms of non-ferrous-iron-containing alloys measuring 60 × 80 × 20 mm, which are installed in the first quarter of the drum in the form of rings with alternating magnetic polarity across the width of the drum, in the second quarter the magnetic system is also made of plates Nd-Fe-B permanent magnets installed on the magnetic core in the form of magnetic rows with alternating magnetic polarity along the material, with a variable pole pitch of 120 mm to 60 mm and possibly by combining individual plates into blocks to achieve the required magnetic field parameters, as well as by the presence of a section with a reduced magnetic field strength at the edge of the magnetic system for unhindered passage of magnetic material from a non-magnetic shell. The presence of the longitudinal and transverse components in one magnetic system, in contrast to their separate installation, allows enriching large and small material without loss of valuable component. The presence of a ring system with high extracting ability allows you to extract all the valuable product in the first quarter of the drum, and the variable pole pitch and the transverse arrangement of the magnetic rows in the second quarter of the magnetic system allows you to transport lumpy material without turning over, and small - to subject magnetic agitation to periodicals with different pole pitch . The quality of the products obtained is regulated by the centrifugal component of the separation process and the slide gate.

These differences allow us to conclude that the proposed technical solution meets the criterion of "novelty." The features distinguishing the claimed technical solution from the prototype are not identified in other technical solutions when studying this and related areas of technology and, therefore, provide the claimed solution with the criterion of "inventive step".

Figure 1 presents a schematic view of a separator. Figure 2 is a view of a magnetic system without a shell (AA).

The described separator consists of a rotating drum 1, with the possibility of adjusting the number of revolutions, inside of which there is a magnetic system 2, mounted on a yoke 3 and consisting of a magnetic circuit 4, permanent magnets in the form of rectangles 5, 6, 7, 8 of various sizes. In the first quarter of the drum, the magnetic system is made in the form of rings 9 with alternating magnetic polarity across the width of the separator. Metal spacers hinder the connection of bipolar poles 16. The pole pitch is selected empirically and verified by calculations in the ELKuT system. The second quarter of the drum consists of magnetic rows 6, 7, 8 with alternating magnetic polarity in the direction of movement of the material and a pole pitch that varies in magnitude from 120 mm to 60 mm. The feeder 10, the gate 11 and the receivers of the products 12, 13 allow you to conduct the process in a continuous mode. The magnetic circuit 4 consists of steel strips with sides 5–8 mm high, mounted on the yoke 3 radially with the possibility of height adjustment — to provide a calibrated gap of 4–5 mm between the surface of the magnets and the non-magnetic shell. The original design of the magnetic circuit provides the required air gap and the entire configuration of the universal magnetic system in both axial and radial directions. The system ends with a section with reduced field strength for unimpeded flow of material 15.

The work of the separator is as follows. The enriched material through the feeder 10 enters the surface of the non-magnetic drum 1 and, when it is rotated, is transported to the magnetic field of the annular magnetic system 9 formed by the magnetic plates 5. The magnetic circuit is made with the possibility of installing several magnetic plates along the vector radius and forming blocks with the goal of achieving the required magnetic induction on the surface of the drum is within 0.3 T.

Thus, using various layout options for non-ferrous-iron-containing magnetic blocks with the number of magnetic plates from 1 to 6, the induction is achieved that is necessary and sufficient to enrich large-sized unclassified magnetite ore under various separation conditions.

The first quarter of the drum material passes without magnetic agitation, which is required for large - up to 250 mm pieces. The waste rock is separated in the first quarter of the drum. The final refinement of the material extracted at the first stage of separation occurs in the second quarter of the drum with transverse magnetic rows 6, 7, 8, consisting of plates of various sizes: 6, 7 - 60 × 80 × 20 mm, 8 - 40 × 80 × 20 mm, providing a variable pole pitch, configuration and field gradient. In the second quarter, there is also the possibility of arranging the magnets in blocks from 1 to 6. A variable pole pitch provides magnetic agitation and obtaining high-quality products, which helps to increase the separation efficiency of unclassified material. The magnetic product attracted to the surface of the non-magnetic drum 1, when it is rotated, is transferred to the receiver 13, and the non-magnetic product, under the action of centrifugal and gravity, enters the receiver 12.

Thus, due to the use of combined magnetic systems, enrichment of large-sized unclassified material is possible, which significantly expands the field of application of magnetic separation as an independent operation in mines, quarries, factories without losing a valuable component.

Claims (1)

A drum magnetic separator containing a non-magnetic rotating drum and a magnetic system located inside the drum, a feeder and a receiver, characterized in that the magnetic system is made of permanent magnet plates of non-imminent sampling, assembled in the first quarter of the drum in the form of rings with alternating magnetic polarity across the width of the drum, the second quarter, the magnetic system is also made of plates of permanent magnets neodymelezobor collected in the form of magnetic rows with alternating magnetic polarity in the direction of travel Nia material with alternating pole pitch of 120 mm to 60 mm and to combine the blocks into separate plates.

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