CN209156147U - The MAGNETIC HYDROCYCLONES selected for weak magnetic mineral and magnetic reconnection close separation system - Google Patents

Abstract

The utility model discloses a magnetic hydrocyclone for selecting weak magnetic minerals. The direction of the magnetic field gradient is from the inside of the hydrocyclone to the outside. The utility model also provides a magnetic gravity combined sorting system. The magnetic gravity combined separation system of the utility model makes full use of the difference in specific magnetic susceptibility and specific gravity between weak magnetic minerals and gangue minerals, and is used in the selection of weak magnetic minerals, with low energy consumption and high separation efficiency. , low cost, easy adjustment and control.

Description

Magnetic Hydrocyclone and Magnetic Gravity Combined Separation System for Weak Magnetic Mineral Selection

technical field

The utility model belongs to the field of mineral processing, in particular to a cyclone and a sorting system for selecting weakly magnetic minerals.

Background technique

Weak magnetic mineral resources mainly include hematite, limonite, siderite, ilmenite, wolframite, manganese ore and tantalum-niobium rare earth ore. These weak magnetic mineral raw materials have played an important role in my country's economic development. High gradient magnetic separation is a common method to deal with weak magnetic minerals, but due to the mechanical inclusion of gangue minerals, it is difficult to obtain qualified weak magnetic mineral concentrate products in a single high gradient magnetic separation operation, and high gradient magnetic separation is usually used in production. In roughing, the obtained rough concentrate is then subjected to flotation and beneficiation to obtain the final concentrate product. The technological process is complex, the consumption of flotation reagents is large, the production index is unstable, and pollution will occur. Compared with the combined magnetic levitation sorting process, the combined magnetic gravity sorting process has been paid more and more attention.

In recent years, high-gradient magnetic separation is used for rough separation of weakly magnetic minerals, and the obtained coarse concentrate is selected with a centrifuge to obtain better separation indicators, but in general, the recovery of fine-grained weakly magnetic minerals rate is still low. The development of a new magnetic-gravity combined separation process and equipment for weakly magnetic minerals is of great significance for the clean and efficient processing and utilization of weakly magnetic minerals.

Utility model content

The technical problem to be solved by this utility model is to overcome the deficiencies and defects mentioned in the above background technology, and to provide a magnetic hydrocyclone and a combined magnetic gravity separation system for the selection of weak magnetic minerals. The magnetic field is used to strengthen the selection of weakly magnetic minerals in the hydrocyclone, and the recovery rate of fine-grained weakly magnetic minerals is higher. In order to solve the above-mentioned technical problems, the technical scheme proposed by the present utility model is:

A magnetic hydrocyclone for the selection of weakly magnetic minerals, including a hydrocyclone, the outer wall of the hydrocyclone is uniformly provided with a plurality of permanent magnets for forming a magnetic field gradient, and the direction of the magnetic field gradient is determined by The inside of the hydrocyclone points to the outside.

In the above-mentioned magnetic hydrocyclone, preferably, the polarities of the permanent magnets on the side close to the outer wall of the hydrocyclone are alternately arranged, and the permanent magnets are all perpendicular to the outer wall of the hydrocyclone. The polarity of the permanent magnets is alternately arranged so that the N pole of a permanent magnet moves to the S pole of the adjacent permanent magnet, and the magnetic lines of force are the densest near the hydrocyclone. The design of this structure can ensure the outer wall of the hydrocyclone. The magnetic force is the largest and the effect is the best.

In the above-mentioned magnetic hydrocyclone, preferably, the hydrocyclone includes a cylindrical section and a conical section that are connected to each other, the cylindrical section is located above the conical section, and an overflow pipe is arranged above the cylindrical section , the top of the side wall of the cylindrical section is provided with a ore feeding port, and the bottom of the conical section is provided with a sand sink.

In the above-mentioned magnetic hydrocyclone, preferably, the inner diameter of the cylindrical section is 50-200mm, the length is 50-150mm, the taper of the conical section is 5-20°, and the inner diameter of the feeding port is 50-200mm. The range is 10-40mm, the inner diameter of the overflow pipe is 10-50mm, the depth is 30-150mm, and the inner diameter of the grit chamber is 5-30mm.

In the above magnetic hydrocyclone, preferably, the size of the magnetic field generated by the permanent magnet is 0.2-0.6T. The strength of the magnetic field can be selected according to the size of the hydrocyclone, and the general magnetic field range is about 0.2-0.6T.

In general hydrocyclones, the density of weak magnetic minerals is usually higher than that of gangue minerals, so they will preferentially enter the bottom flow to become magnetic products, and gangue minerals enter the overflow to become non-magnetic products. The direction of the minerals has a great influence, and the magnetic mineral particles with small particle size are also less affected by the centrifugal force, so they are easy to enter the overflow product and lose, resulting in a decrease in the recovery rate. The design principle of the magnetic hydrocyclone in the present utility model is as follows: by evenly distributing strong permanent magnets with opposite polarities around the hydrocyclone, the direction of the magnetic lines of force generated by the permanent magnets is from the N pole of one permanent magnet to the adjacent one. The S pole of the permanent magnet is the densest magnetic field near the hydrocyclone, and the magnetic field gradient points from the inside of the hydrocyclone to the outside, so an outward magnetic field force will be generated for the weakly magnetic mineral particles. It is also subjected to the magnetic force from the inside to the outside, so it is more conducive to enter the sand and become a magnetic product. The introduction of magnetism can greatly increase the recovery of fine-grained weakly magnetic minerals.

As a general technical concept, the present utility model also provides a combined magnetic gravity separation system, including a magnetic separator for coarsely separating weakly magnetic minerals and a magnetic hydrocyclone for selecting weakly magnetic minerals device.

The utility model also provides a method for using the above-mentioned magnetic gravity combined sorting system for magnetic gravity combined sorting, comprising the following steps:

S1: Rough separation of weak magnetic minerals by strong magnetic separator or high gradient magnetic separator to obtain coarse concentrate;

S2: The coarse concentrate obtained in S1 is sent to a magnetic hydrocyclone for sorting to obtain sand settling and overflow, and the concentrate product is obtained by collecting the settling sand.

In the above method, preferably, the weakly magnetic minerals include any one of hematite, limonite, siderite, manganese ore, wolframite and tantalum niobium rare earth ore.

In the above method, preferably, the weak magnetic minerals are subjected to pulverization and sizing treatment before roughing. Pulverizing refers to pulverizing the weak magnetic minerals to -200 mesh, accounting for 80-95%. Weak magnetic minerals are adjusted to a slurry with a mass concentration of 25-35%.

In the above method, preferably, the rough selection is carried out under the condition of 5000-10000GS.

In the above method, preferably, the coarse concentrate is adjusted into a slurry with a mass concentration of 30-45% and then sent to a magnetic hydrocyclone for sorting.

Compared with the prior art, the advantages of the present utility model are:

1. The magnetic hydrocyclone of the present utility model is provided with permanent magnets on the outer wall of the hydrocyclone to form a centrifugal force-magnetic composite force field sorting equipment, and the strengthening effect of the magnetic field is utilized to obtain qualified concentrate products. Under the premise, the recovery rate of fine-grained weak magnetic minerals can be improved as much as possible.

2. The magnetic gravity combined sorting system of the present utility model makes full use of the difference in specific magnetic susceptibility and specific gravity between weakly magnetic minerals and gangue minerals, and is used in the selection of weakly magnetic minerals, with environmentally friendly process and low energy consumption. The sorting efficiency is high, the cost is low, and it is easy to adjust and control.

Description of drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without creative efforts.

FIG. 1 is a schematic view of the cutaway structure of the magnetic hydrocyclone in Embodiment 1 of the present invention.

FIG. 2 is a top view of FIG. 1 .

FIG. 3 is a process flow diagram of the method for combined magnetic gravity separation of the present invention.

FIG. 4 is a schematic structural diagram of the magnetic medium in the neutral ring high gradient magnetic separator in Example 2. FIG.

5 is a schematic diagram of the swivel structure of the neutral ring high gradient magnetic separator in Example 2.

illustration:

1. Overflow pipe; 2. Permanent magnet; 3. Cylindrical section; 5. Conical section; 6. Sand settling nozzle; 7. Mine feeding port; 10. Non-magnetically conductive part; 20. Magnetically conductive part; ; 50. Feeding system.

Detailed ways

In order to facilitate understanding of the present utility model, the present utility model will be described more comprehensively and in detail below with reference to the accompanying drawings and preferred embodiments of the specification, but the protection scope of the present utility model is not limited to the following specific embodiments.

Unless otherwise defined, all technical terms used hereinafter have the same meaning as commonly understood by those skilled in the art. The technical terms used herein are only for the purpose of describing specific embodiments, and are not intended to limit the protection scope of the present invention.

Unless otherwise specified, various raw materials, reagents, instruments and equipment used in the present invention can be purchased from the market or can be prepared by existing methods.

Example 1:

As shown in FIGS. 1 and 2 , the magnetic hydrocyclone used for the selection of weakly magnetic minerals in this embodiment includes a hydrocyclone. The outer wall of the hydrocyclone is uniformly provided with a plurality of permanent magnets for forming a magnetic field gradient. Magnet 2, the direction of the magnetic field gradient is from the inside of the hydrocyclone to the outside.

In this embodiment, the polarities of the permanent magnets 2 are alternately arranged on the side close to the outer wall of the hydrocyclone, and the permanent magnets 2 are all perpendicular to the outer wall of the hydrocyclone. The highest magnetic field generated by permanent magnet 2 is 0.4T.

In this embodiment, the hydrocyclone includes a cylindrical section 3 and a conical section 5 that are connected to each other. The cylindrical section 3 is located above the conical section 5 , an overflow pipe 1 is arranged above the cylindrical section 3 , and above the side wall of the cylindrical section 3 A ore feeding port 7 is provided, and a sand sink 6 is provided at the bottom of the conical section 5 . The outer walls of the cylindrical section 3 and the conical section 5 are provided with permanent magnets 2 . Seven permanent magnets 2 are evenly distributed on the outer wall of the cylindrical section 3 , and 8 permanent magnets 2 are evenly distributed on the outer wall of the conical section 5 .

In this embodiment, the inner diameter of the cylindrical section 3 is 150 mm, the length is 150 mm, the taper of the conical section 5 is 10°, the length of the conical section is 250 mm, the inner diameter of the feeding port 7 is 20 mm, and the inner diameter of the overflow pipe 1 is 30 mm , the depth is 30-150mm, and the inner diameter of the sand sink 6 is 20mm.

The magnetic gravity combined sorting system of this embodiment includes the above-mentioned magnetic hydrocyclone and a vertical ring pulsating high gradient magnetic separator.

As shown in Figure 3, the method for magnetic gravity combined separation of hematite using the magnetic gravity combined sorting system in this embodiment includes the following steps:

S1: Pulverize the weak magnetic hematite with a grade of 25% to -200 mesh, accounting for 85%, and adjust the slurry to a mass concentration of 30%, as ore feeding;

S2: Use the vertical ring pulsating high gradient magnetic separator to roughen the above-mentioned feed ore under the condition of 5000-10000GS to obtain a rough concentrate with an iron grade of 45%, and adjust the rough concentrate to 35%;

S3: use the pump to feed the ore into the magnetic hydrocyclone through the ore feeding port 7 for sorting to obtain the sand settling and overflow.

Example 2:

The magnetic hydrocyclone in this embodiment is the same as that in Embodiment 1.

The magnetic gravity combined separation system of this embodiment includes the above-mentioned magnetic hydrocyclone and a vertical ring high gradient magnetic separator.

Utilize the magnetic hydrocyclone in the present embodiment to carry out the method for magnetic gravity combined separation of hematite, comprising the following steps:

S1: Pulverize the weak magnetic hematite with a grade of 25% to -200 mesh, accounting for 80%, and adjust the slurry to a mass concentration of 35%, as the ore feeding;

S2: Use a vertical ring high gradient magnetic separator to roughen the above-mentioned feed ore under the condition of 5000-10000GS to obtain coarse concentrate, and adjust the coarse concentrate to 45%;

S3: Use the pump to send the ore into the magnetic hydrocyclone through the ore feeding port 7 for sorting to obtain the sand settling and overflow. The ore feeding pressure is 0.07MPa, and the concentrated ore product is obtained by collecting the settling sand.

In this embodiment, the vertical ring high gradient magnetic separator (without a pulsation generator for applying pulsating flow) includes a swivel ring 40, a magnetic field generating device and a feeding system 50, and the feeding system 50 is arranged inside the swivel ring 40, A magnetic medium stack is continuously and uniformly arranged in the swivel ring 40, and the magnetic medium stack is composed of a plurality of magnetic media. Among them, the magnetic medium is sequentially provided with a non-magnetic-conducting part 10 and a magnetic-conducting part 20 along the flow direction of the slurry, the non-magnetic-conducting part 10 and the magnetic-conducting part 20 are fixed to each other, and the edge of the non-magnetic-conducting part 10 is a smooth curved surface for drainage structure or sharp-angle structure (such as semicircle, semi-ellipse or semi-rhombus), the magnetic conductive part 20 requires that it should be able to generate a larger magnetic field range (such as semi-circle, semi-ellipse or semi-rhombus), with more of the magnetic particles in the mine. As shown in FIG. 4 , the cross-sections of the non-magnetic-conductive part 10 and the magnetic-conductive part 20 of the magnetic medium shown in the figure are both semicircular (the shapes of the non-magnetic-conductive part 10 and the magnetic-conductive part 20 can also be changed according to requirements) ). As shown in FIG. 5 , a schematic structural diagram of the rotating ring 40 of the vertical ring high gradient magnetic separator in this embodiment is shown.

In the vertical ring high gradient magnetic separator of this embodiment, the non-magnetic part 10 in the magnetic medium faces the center of the swivel 40 , and the magnetically permeable part 20 and the non-magnetic part 10 in the magnetic medium stack at the bottom of the swivel 40 are separated from each other. The junction surface is perpendicular to the direction of the background magnetic field.

The vertical ring high gradient magnetic separator in this embodiment has the following advantages: 1. The magnetic medium of the vertical ring high gradient magnetic separator is sequentially provided with a non-magnetically conductive part 10 and a magnetically conductive part 20 along the flow direction of the slurry. When the magnetic particles and the non-magnetic particles pass through the magnetic medium, the non-magnetic part 10 has no magnetic force and will not capture the magnetic particles, and due to the drainage effect of the non-magnetic part 10, almost all of the ore feeding passes through the non-magnetic part 10 and does not pass through. It will accumulate in the non-magnetic part 10, which can eliminate the accumulation of particles in the upstream of conventional magnetic medium, eliminate the accumulation of magnetic particles in the upstream of the magnetic medium, make most or all of the magnetic particles accumulate in the downstream of the magnetic medium, and reduce the accumulation of magnetic minerals by the feed flow. The direct impact of the zone can reduce or eliminate mechanical inclusions and improve the grade of recovered minerals. 2. The non-magnetic part 10 and the magnetically permeable part 20 of the magnetic medium of the vertical ring high gradient magnetic separator adopt specific shapes. 10 cooperates with the material of the magnetic conductive part 20, so that the magnetic medium can generate a flow field and a magnetic field that is more conducive to the collection of magnetic minerals, which can further strengthen the effect of the magnetic medium, reduce or eliminate mechanical inclusions, and strengthen weak magnetic minerals. collection efficiency. 3. The magnetic medium of the vertical ring high gradient magnetic separator can be directly applied to the existing conventional magnetic separator. It can be used directly without improving the structure of the current magnetic separator, and the practical application is more convenient.

Using the vertical ring high gradient magnetic separator in this embodiment to cooperate with the magnetic hydrocyclone, on the one hand, the coarse concentrate obtained by the vertical ring high gradient magnetic separator has less impurities and higher grades, on the other hand, The existence of the magnetic hydrocyclone can improve the recovery rate of fine-grained weak magnetic minerals as much as possible on the premise of obtaining qualified concentrate products.

Claims (6)

1. a magnetic hydrocyclone for the selection of weakly magnetic minerals, is characterized in that, comprises a hydrocyclone, and the outer wall of the hydrocyclone is evenly provided with a plurality of permanent magnets (2) for forming a magnetic field gradient. ), the direction of the magnetic field gradient points from the inside of the hydrocyclone to the outside. 2. The magnetic hydrocyclone according to claim 1, wherein the permanent magnets (2) are alternately arranged in polarity on one side close to the outer wall of the hydrocyclone, and the permanent magnets (2) are perpendicular to the outer wall of the hydrocyclone. 3. The magnetic hydrocyclone according to claim 1, wherein the hydrocyclone comprises a cylindrical section (3) and a conical section (5) that are connected to each other, and the cylindrical section (3) is located in the Above the conical section (5), an overflow pipe (1) is provided above the cylindrical section (3), and a ore feed port (7) is provided above the side wall of the cylindrical section (3). The bottom of the section (5) is provided with a grit nozzle (6). 4. The magnetic hydrocyclone according to claim 3, wherein the inner diameter of the cylindrical section (3) is in the range of 50-200 mm, the length in the range of 50-150 mm, and the taper of the conical section (5) is in the range of 50-200 mm. The range is 5-20°, the inner diameter of the ore feeding port (7) is 10-40mm, the inner diameter of the overflow pipe (1) is 10-50mm, the depth is 30-150mm, the sand settling The inner diameter of the nozzle (6) is in the range of 5-30 mm. 5. The magnetic hydrocyclone according to any one of claims 1-4, characterized in that, the size of the magnetic field generated by the permanent magnet (2) is 0.2-0.6T. 6. A combined magnetic gravity separation system, characterized in that it comprises a magnetic separator for roughing weakly magnetic minerals and a magnetic hydrocyclone for selecting weakly magnetic minerals. The cyclone is the magnetic hydrocyclone described in any one of claims 1-5.