Airflow suspension dry type magnetic separation combined equipment

Abstract

The utility model discloses airflow suspension dry type magnetic separation combined equipment which comprises a drum type magnetic separator and a low-pressure pulse bag type collector (14). The drum type magnetic separator comprises a drum (6) located in a separation box body (8), a magnetic system (7) is arranged in the drum (6), a discharging opening of a feeding conical drum (19) penetrates through the upper portion of the separation box body (8) and corresponds to the upper portion of the drum (6), and a magnetic separator air inlet (5) is formed in the side face of the feeding conical drum (19). A tailing discharging port (10) is formed in the lower portion of the separation box body (8) and located on one side of the magnetic system (7), a concentrate discharging port (9) is formed in the lower portion of the separation box body (8) and away from one side of the magnetic system (7), and an air outlet (13) of the magnetic separator is connected with a dust feeding port of a low-pressure pulse bag type collector (14). According to the utility model, high-efficiency separation of fine powdery dry materials is realized under the condition of airflow suspension, the problem of poor dispersity of mineral powder on the surface of the roller is effectively solved, and the problem of dust pollution in the dry separation process of the fine materials is completely eradicated.

Description

Technical Field

[0001] The utility model belongs to the technical field of iron ore separation, and in particular relates to a magnetic ore dry separation device, which is particularly suitable for the efficient separation of magnetic iron in fine-grained powdery dry materials. Background Art

[0002] Permanent magnetic dry separator is an effective dry magnetic separation equipment for strongly magnetic minerals. At present, the permanent magnetic dry separators used at home and abroad are all traditional belt-head wheel separators, which are effective in sorting large minerals, but the current dry magnetic separation is only suitable for dry tailing of coarse, medium and fine particles between 350 and 20 mm, and commercial iron concentrate cannot be obtained. Especially when sorting small powdered minerals, due to the fine particle size and easy agglomeration of the materials, the current dry magnetic separator cannot effectively sort and separate the powdered materials.

[0003] In addition, the powder ore dry magnetic separators currently under development still have dust pollution problems, which are extremely unfriendly to the environment; and it is impossible to obtain high-grade commercial iron ore concentrate through dry separation.

[0004] Therefore, it is urgent to develop equipment suitable for dry sorting of iron ore in arid, water-scarce, high-altitude and cold areas. Utility Model Content

[0005] The purpose of the utility model is to provide an air flow suspension dry magnetic separation combined equipment suitable for use in arid and water-deficient areas in view of the above-mentioned problems existing in the prior art.

[0006] In order to achieve the above-mentioned purpose of the utility model, the utility model adopts the following technical solutions for an airflow suspension dry magnetic separation combined device:

[0007] The utility model discloses an air flow suspension dry magnetic separation combined equipment, which contains a raw material bin. It is characterized in that it also contains a drum magnetic separator and a low-pressure pulse bag collector; the drum magnetic separator includes a drum located in a sorting box, a magnetic system is arranged in the drum, the magnetic system is installed on the rotating shaft of the drum, the magnetic wrap angle of the magnetic system is greater than 198°, and the drum and the sorting box are supported on a frame; a vibrating distributor and a feeding cone are arranged in sequence between the raw material bin and the sorting box, the vibrating distributor is inclined, the receiving end of the vibrating distributor is located at the lower part of the raw material bin, the discharge port of the vibrating distributor is connected to the feed port of the feeding cone, the discharge port of the feeding cone passes through the upper part of the sorting box and corresponds to the upper part of the drum, and the feeding cone is connected to the feeding cone. An air inlet for a magnetic separator is arranged on the side of the material cone; a tailings discharge port is arranged on the side of the lower part of the sorting box body located at the magnetic system, a concentrate discharge port is arranged on the side of the lower part of the sorting box body away from the magnetic system, and an air outlet for a magnetic separator is arranged on the upper part of the sorting box body located at the side of the magnetic system; the air outlet of the magnetic separator is connected to the dust feed port of a low-pressure pulse bag collector through a pipeline, the side of the low-pressure pulse bag collector is connected to the fan through a pipeline, a dust discharge port is arranged at the bottom of the low-pressure pulse bag collector, a spiral material conveyor is arranged obliquely at the lower part of the dust discharge port, and the outlet of the spiral material conveyor corresponds to the tailings bin for storing tailings.

[0008] Furthermore, the magnetic wrap angle of the magnetic system is preferably in the range of 210 to 240°, the number of magnetic poles of the magnetic system is preferably 15 to 20, and the N and S poles are alternated along the circumferential direction.

[0009] As a preferred embodiment of the utility model, the tailings discharge port is equipped with a rotary feeder with adjustable discharge speed, and the concentrate discharge port is also equipped with a rotary discharge valve with adjustable discharge speed, the purpose of which is to ensure that a portion of the corresponding concentrate and tailings always remain in the concentrate area and tailings area in the sorting box. This design can prevent air from directly entering the sorting box from the concentrate discharge port and the tailings discharge port, affecting the gas-solid suspension state inside the sorting box. The concentrate discharge port and the tailings discharge port are installed with a rotary discharge valve with adjustable discharge speed, so that after magnetic separation of ores of different properties, the concentrate and tailings yields obtained are different. By adjusting the discharge speed, it is ensured that a portion of the corresponding concentrate and tailings always remain in the concentrate area and the tailings area in the sorting box, thereby ensuring the stability of the gas-solid suspension state inside the sorting box.

[0010] Furthermore, the sorting box is a closed space structure.

[0011] As a preferred embodiment of the present invention, the vibrating distributor is a uniform vibrating distributor with adjustable amplitude and frequency.

[0012] In actual use, the utility model of an airflow suspension dry magnetic separation combined equipment is used for the separation of powder materials with a particle size of ≤3mm and a moisture content of less than 5%. If the moisture content is too high, it is easy to agglomerate and cannot form an airflow suspension state. If the particle size is too large, it cannot form an airflow suspension state, which is not conducive to efficient separation. In addition, the frequency converter is used to adjust the drum surface linear speed of the drum magnetic separator to control it in the range of 2 to 10m / s. If the speed is too low, it will affect the equipment processing capacity and the concentrate grade; if the speed is too high, it will affect the recovery rate of the magnetic ore.

[0013] Compared with the prior art, the utility model of an airflow suspension dry magnetic separation combined equipment adopts the above technical solution, which has the following beneficial effects:

[0014] (1) For the first time in China and abroad, an airflow suspension dry magnetic separation combined equipment was used to efficiently separate fine-grained dry materials containing magnetic iron with a particle size of ≤3mm and a moisture content of less than 5%, effectively solving the problem of poor dispersion of mineral powder on the drum surface. The results of laboratory test research show that compared with conventional fine-grained dry magnetic separators, under similar recovery rates, the total iron grade of the concentrate is increased by 3 to 7 percentage points.

[0015] (2) The speed of the drum magnetic separator is adjustable, the wind speed at the feed port of the magnetic separator is adjustable, the residence time of the concentrate in the concentrate area is adjustable, and the residence time of the tailings in the tailings area is adjustable. According to the feed particle size and the magnetic iron content, the appropriate magnetic field strength, drum speed, and wind speed at the feed port of the magnetic separator can be selected to achieve the superposition and coordination of magnetic separation, gravity separation, wind separation, and centrifugal separation in the separation box to obtain the optimal separation conditions.

[0016] (3) Material sorting is carried out in the closed space of the sorting box. The fine powder with low magnetic iron content discharged from the air outlet of the magnetic separator is processed by a low-pressure pulse bag collector. The fan outlet is purified air, which effectively eliminates the dust pollution problem during the dry sorting of fine particles. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The utility model is a schematic diagram of the structure of an airflow suspension dry magnetic separation combined equipment.

[0018] The accompanying drawings are marked as: 1-raw material bin, 2-raw material, 3-vibrating distributor, 4-feeding port of magnetic separator, 5-air inlet of magnetic separator, 6-drum, 7-magnetic system, 8-sorting box, 9-concentrate discharge port, 10-tailings discharge port, 11-concentrate, 12-tailings, 13-air outlet of magnetic separator, 14-low-pressure pulse bag collector, 15-dust discharge port, 16-screw material conveyor, 17-fan, 18-rotating shaft; 19-feeding cone. DETAILED DESCRIPTION

[0019] In order to better describe the utility model, the airflow suspension dry magnetic separation combined equipment of the utility model is further described in detail below with reference to the accompanying drawings.

[0020] Depend on Figure 1 As shown in the schematic diagram of the structure of the airflow suspension dry magnetic separation combined device of the utility model, the airflow suspension dry magnetic separation combined device of the utility model comprises a raw material bin 1, a drum magnetic separator, and a low-pressure pulse bag collector 14; the drum magnetic separator comprises a drum 6 located in a sorting box 8, a magnetic system 7 is arranged in the drum 6, and the magnetic system 7 is mounted on the rotating shaft 18 of the drum 6 and is fixed, the magnetic wrap angle of the magnetic system 7 is 210-240°, the number of magnetic poles of the magnetic system is 15-20, and the N and S poles are alternated along the circumferential direction, and the drum 6 passes through the rotating shaft 18. The bearing seat is supported on the frame, and the sorting box 8 is a closed space structure and supported on the frame; a vibrating distributor 3 and a feeding cone 19 are sequentially arranged between the raw material bin 1 and the sorting box 8, the vibrating distributor 3 is tilted, and the vibrating distributor 3 adopts an amplitude and frequency adjustable uniform vibration distributor, the receiving end of the vibrating distributor 3 is located at the lower part of the raw material bin 1, the discharge port of the vibrating distributor 3 is connected with the feed port of the feeding cone 19, the discharge port of the feeding cone 19 passes through the upper part of the sorting box 8 and corresponds to the upper part of the drum 6, and on the side of the feeding cone 19 A magnetic separator air inlet 5 is provided on the surface; a tailings discharge port 10 is provided at the lower part of the sorting box 8 on one side of the magnetic system 7, and the tailings discharge port 10 is equipped with a rotary discharge valve with adjustable discharge speed, and a tailings bin for storing tailings 12 is provided at the lower part of the tailings discharge port 10; a concentrate discharge port 9 is provided at the lower part of the sorting box 8 on the side away from the magnetic system 7, and the concentrate discharge port 9 is equipped with a rotary discharge valve with adjustable discharge speed, and a concentrate bin for storing concentrate 11 is provided at the lower part of the concentrate discharge port 9; a magnetic separator is provided at the upper part of the sorting box 8 on the side of the magnetic system 7. The air outlet 13 of the magnetic separator is connected to the dust feed port of the low-pressure pulse bag collector 14 through a pipeline, and the side of the low-pressure pulse bag collector 14 is connected to the fan 17 through a pipeline. The lower part of the low-pressure pulse bag collector 14 is provided with a dust discharge port 15, and a spiral material conveyor 16 is obliquely provided at the lower part of the dust discharge port 15. The outlet of the spiral material conveyor 16 corresponds to the tailings bin for storing tailings 12; the rotation speed of the drum 6 is adjusted by a frequency converter, and the surface linear speed of the drum 6 is controlled in the range of 2 to 10 m / s.

[0021] In the specific application of the utility model of air flow suspension dry magnetic separation combined equipment, the relevant technical parameters are designed as follows:

[0022] ① Used for airflow dry magnetic separation of powdery materials with a particle size of 3 to 0 mm: the magnetic field intensity of the drum 6 surface during rough separation is 400mT to 500mT, the rotation speed of the drum 6 is 2m / s to 4m / s, and the wind speed at the feed port 4 of the magnetic separator is 4m / s to 8m / s; the magnetic field intensity of the drum 6 surface during fine separation is 350mT to 450mT, the rotation speed of the drum 6 is 4m / s to 6m / s, and the wind speed at the feed port 4 of the magnetic separator is 8m / s to 12m / s;

[0023] ② Used for airflow dry magnetic separation of powdery materials with a particle size of -0.076mm accounting for 50% to 70%: the magnetic field intensity of the drum 6 surface during airflow dry magnetic separation is 400mT to 500mT, and the wind speed of the magnetic separator feed port 4 is 5m / s to 10m / s; the magnetic field intensity of the drum 6 surface during airflow dry magnetic separation is 350mT to 450mT, and the wind speed of the magnetic separator feed port 4 is 10m / s to

[0024] 15m / s;

[0025] ③ Used for airflow dry magnetic separation of powdery materials with a particle size of -0.076mm accounting for 80% to 90%: the magnetic field intensity on the surface of drum 6 during rough separation of airflow dry magnetic separation is 350mT to 450mT, and the wind speed at the feed port 4 of the magnetic separator is 4m / s to 8m / s; the magnetic field intensity on the surface of drum 6 during fine separation of airflow dry magnetic separation is 250mT to 350mT, and the wind speed at the feed port 4 of the magnetic separator is 8m / s to 12m / s.

[0026] The operation process of the air flow suspension dry magnetic separation combined equipment of the utility model when in use is as follows: the raw material 2 is uniformly fed into the vibrating distributor 3 through the raw material bin 1, and the material is uniformly distributed on the vibrating distributor 3 by controlling the vibration amplitude, so that the material is uniformly fed into the drum magnetic separator in the sorting box through the magnetic separator feed port 4 in the horizontal and vertical directions. The magnetic separator air inlet 5 is located below the magnetic separator feed port 4. The high-speed air contacts the material to form a gas-solid two-phase flow with a certain speed and good material dispersion. Under the action of the high-speed rotating drum 6 and the magnetic system 7, the magnetic material is adsorbed on the surface of the drum 6, and enters the concentrate discharge area as the drum rotates 6, and enters the concentrate bin through the adjustable concentrate discharge port 9 to form concentrate 11. The coarse particles in the non-magnetic material directly enter the tailings discharge area due to inertia and gravity, and enter the tailings bin through the adjustable tailings discharge port 10 to form tailings 12. The fine particles in the non-magnetic material enter the low-pressure pulse bag collector 14 through the magnetic separator outlet 13 with high-speed air, and the collected non-magnetic fine particles enter the tailings bin through the dust discharge port 15 and the spiral material conveyor 16 to form tailings 12. The high-speed air power source is provided by the fan 17, and the fan outlet is purified air, thereby completing the entire sorting operation. Material sorting is carried out in the closed space of the sorting box 8, which effectively eliminates the dust pollution problem during the dry sorting of fine particles.

[0027] The utility model has prepared an industrial prototype of an air suspension dry magnetic separation combined equipment, and has been tested on iron-containing surrounding rocks. The iron-containing surrounding rocks (referred to as raw ore) were taken from a spoil dump of a mining company in Inner Mongolia. The iron grade in the raw ore was 13.40%, and the magnetic iron grade was 5.35%, which was much lower than the boundary grade of magnetite.

[0028] In the embodiment, the raw ore is subjected to crushing, screening, dry magnetic separation, high-pressure roller mill, ball mill, dry high-frequency vibrating screen classification, cyclone separator classification and several airflow dry magnetic separations of the utility model, and finally an excellent iron ore concentrate grade TFe63.81% and an iron recovery rate of 83.05 are obtained, which creates a precedent for directly obtaining high-grade commercial iron ore concentrate powder by dry magnetic separation of powder ore, and achieves unexpected technical effects.

Claims

1. An air flow suspension dry magnetic separation combined device, comprising a raw material bin (1), characterized in that: It also contains a drum magnetic separator and a low-pressure pulse bag collector (14); the drum magnetic separator comprises a drum (6) located in a sorting box (8); a magnetic system (7) is arranged in the drum (6); the magnetic system (7) is mounted on a rotating shaft (18) of the drum (6); the magnetic wrap angle of the magnetic system (7) is greater than 198°; the drum (6) and the sorting box (8) are supported on a frame; a vibrating distributor (3) and a feeding cone (19) are arranged in sequence between the raw material bin (1) and the sorting box (8); the vibrating distributor (3) is arranged in an inclined manner; the receiving end of the vibrating distributor (3) is located at the lower part of the raw material bin (1); the discharge port of the vibrating distributor (3) is connected to the feed port of the feeding cone (19); the discharge port of the feeding cone (19) passes through the upper part of the sorting box (8) and corresponds to the upper part of the drum (6); A magnetic separator air inlet (5) is provided on the side of the separation box (19); a tailings discharge port (10) is provided on the lower part of the separation box (8) on the side of the magnetic system (7); a concentrate discharge port (9) is provided on the lower part of the separation box (8) away from the magnetic system (7); and a magnetic separator air outlet (13) is provided on the upper part of the separation box (8) on the side of the magnetic system (7); the magnetic separator air outlet (13) is connected to the dust feed port of the low-pressure pulse bag collector (14) through a pipeline, the side of the low-pressure pulse bag collector (14) is connected to the fan (17) through a pipeline, the lower part of the low-pressure pulse bag collector (14) is provided with a dust discharge port (15), and a spiral material conveyor (16) is obliquely provided below the dust discharge port (15), and the outlet of the spiral material conveyor (16) corresponds to the tailings bin for storing tailings (12).

2. The airflow suspension dry magnetic separation combined equipment according to claim 1, characterized in that: The magnetic wrap angle of the magnetic system (7) is 210-240°, the number of magnetic poles of the magnetic system is 15-20, and the N and S poles are alternating along the circumferential direction.

3. The airflow suspension dry magnetic separation combined equipment according to claim 1, characterized in that: The tailings discharge port (10) is equipped with a rotary discharge valve capable of adjusting the discharge speed.

4. The airflow suspension dry magnetic separation combined equipment according to claim 1, characterized in that: The concentrate discharge port (9) is equipped with a rotary discharge valve capable of adjusting the discharge speed.

5. An airflow suspension dry magnetic separation combined device as claimed in claim 1, 2, 3 or 4, characterized in that: The sorting box (8) is a closed space structure.

6. The airflow suspension dry magnetic separation combined equipment according to claim 5, characterized in that: The vibrating distributor (3) is a uniform vibrating distributor with adjustable amplitude and frequency.

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