High gradient magnetic separator with stacked diamond mesh

Abstract

This invention relates to a diamond-shaped mesh stack for a high-gradient magnetic separator, consisting of several sets of meshes stacked sequentially. Each mesh set consists of N single-layer meshes stacked in a regular order; N≥2; each single-layer mesh is made of diamond-shaped steel mesh manufactured by a toothed die and cut and processed according to rules; the outer ring of each single-layer mesh is circular; the center is "O"; the x-direction is the direction parallel to the diagonal of the connecting mesh ridge within a single mesh; the distance between two adjacent meshes in the x-direction of a single-layer mesh is "L"; within the same mesh set, the centers O of two adjacent single-layer meshes are shifted a distance P relative to their positions within the mesh along the x-direction; P=L / N. This invention carefully designs the single-layer meshes and mesh sets, ultimately stacking them into a diamond-shaped mesh stack to reduce obstruction to the mesh ridge, fully utilize the sharp angles on the ridge for magnetization, and avoid forming extremely small gaps that could cause blockage.

Description

Technical Field

[0001] This invention relates to a diamond-shaped mesh stack for use in a high-gradient magnetic separator, belonging to the field of magnetic separation technology. Background Technology

[0002] High-gradient magnetic separators utilize high-performance soft magnetic materials as magnetic focusing media to generate a high-gradient magnetic field in the vicinity of a background magnetic field, thereby magnetically adsorbing magnetic mineral particles passing through that area. These soft magnetic materials are toothed, filamentous, or rod-shaped, and are used in various magnetic separation applications. Due to their shape and size characteristics, their usage methods also differ. For example, there is a gradient sawtooth magnetic media box for a high-gradient magnetic separator (Chinese Patent Publication No. CN102909128A), and a magnetic focusing media box for a high-gradient magnetic separator (Chinese Patent Publication No. CN103357495A). As for the usage of steel wool, it began to mature as early as the 1990s, as exemplified by the article "Structural Study of Magnetic Conductive Stainless Steel Wool" published in the journal "Mining and Metallurgical Engineering" in 1991.

[0003] In many high-gradient magnetic separators, rhomboid mesh sheets are preferred, which are stacked one by one to form a magnetically focusing medium. The two basic characteristics of rhomboid mesh sheets are: 1. The mesh openings are rhomboid; 2. The cross-section of the mesh ridges is rectangular or rhomboid.

[0004] Theoretically, 1. All four edges (ribs) of the mesh can adsorb magnetic mineral particles, so the diamond mesh has a robust and stable structure, while also providing more adsorption areas; 2. The sharp corners on the ribs make its magnetic focusing ability second only to filamentous magnetic media, and superior to serrated and rod-shaped magnetic media. In addition, diamond mesh also has the advantages of simple manufacturing and low cost.

[0005] However, it is difficult to achieve high throughput and high concentrate grade in industrial magnetic separation equipment. On the contrary, severe local clogging and low separation rate often occur together. After repeated trials and careful research, it was found that the root cause of the above phenomena lies in the manufacturing process of two "extensive" screens and their stacking:

[0006] 1. The wire mesh is randomly cut from a wide rectangular steel mesh;

[0007] 2. During the stacking process, the mesh sheets are randomly positioned at different angles within the plane.

[0008] The result is that in some areas, the ridges of adjacent mesh sheets almost overlap, reducing the adsorption capacity of that area and making it very easy to cause blockage; while in other areas, the space enclosed by the ridges of adjacent mesh sheets is large, with low flow resistance, fast slurry flow rate, and most of the space is far from the ridges, making it difficult for the corners on the ridges to form effective magnetic adsorption for the weakly magnetic mineral particles.

[0009] Therefore, in order to address the above problems, it is necessary to improve the diamond-shaped mesh stacking and single-layer mesh used in high-gradient magnetic separators, so as to meet the high-efficiency magnetic focusing requirements of high-gradient magnetic separators. Summary of the Invention

[0010] The purpose of this invention is to provide a diamond-shaped mesh stack for a high-gradient magnetic separator, and to design the structure of the single-layer mesh and the mesh stack so that it can achieve efficient magnetic focusing when applied to a high-gradient magnetic separator.

[0011] To achieve the above-mentioned objectives, the present invention provides a diamond-shaped mesh stack for a high-gradient magnetic separator, which is composed of several groups of meshes stacked sequentially;

[0012] Each mesh assembly consists of N single-layer meshes stacked in a regular order; N≥2;

[0013] The single-layer wire mesh is made of diamond-shaped steel mesh that has been punched by a toothed die and then cut and processed according to rules;

[0014] Each mesh of the diamond-shaped steel mesh has 6 sides around it, which are parallel to each other in pairs; among them, the vertical connection between two adjacent meshes is the connecting mesh, which is connected to two single meshes, namely the first mesh and the second mesh.

[0015] The thickness of the connecting mesh ridge is twice the thickness of the first or second mesh ridge;

[0016] The length of the connecting embankment is shorter than the length of the first or second embankment;

[0017] The outer ring of the single-layer mesh is circular; the center of the circle is "O".

[0018] In a single mesh, the direction parallel to the diagonal of the connecting ridges is defined as the x-direction;

[0019] In a single-layer mesh, the spacing between two adjacent meshes in the x-direction is “L”;

[0020] N single-layer mesh panels within the same mesh panel assembly are translated and cut into diamond-shaped steel mesh along the x-direction;

[0021] For N single-layer meshes within the same mesh assembly, the center O of two adjacent single-layer meshes is shifted a distance P relative to their position in the mesh along the x-direction; P = L / N;

[0022] Within the same mesh assembly, the nth single-layer mesh has the same translation direction of its center O relative to the (n-1)th single-layer mesh; n = 2 to N;

[0023] When adjacent layers of mesh are stacked into a diamond-shaped mesh stack, the first piece of the previous mesh stack and the Nth piece of the next mesh stack are placed adjacent to each other, and the direction of the connecting mesh ridges of the single-layer mesh within the adjacent mesh stacks is consistent.

[0024] As a further improvement of the present invention, N = 3;

[0025] The three single-layer mesh panels in the same mesh panel combination are the first layer mesh panel, the second layer mesh panel, and the third layer mesh panel;

[0026] The first layer of mesh, with center O1 located slightly to the left of the mesh opening;

[0027] The second layer of mesh has its center O2 shifted by a distance P relative to the center O1 of the first layer of mesh, and its center O2 is located in the middle of the mesh.

[0028] The third mesh layer has its center O3 shifted by a distance P relative to the center O2 of the second mesh layer, and its center O3 is located slightly to the right of the mesh opening.

[0029] The first layer of mesh, the second layer of mesh, and the third layer of mesh are stacked in sequence to form a mesh combination.

[0030] As a further improvement of the present invention, positioning holes are provided on the single-layer mesh; the positions of the positioning holes relative to the center O and the x-axis direction are fixed.

[0031] Furthermore, the positioning hole is a round hole, and the diameter of the positioning hole is larger than the short pitch of the diamond mesh.

[0032] The diameter of the positioning hole is more than 1.5 times the short pitch of the diamond mesh.

[0033] Furthermore, the number of positioning holes is two or more.

[0034] Furthermore, the diameters of two or more positioning holes are different.

[0035] Furthermore, the positions of two or more positioning holes are asymmetrical relative to the center O and the x-axis.

[0036] Furthermore, the positions of more than three positioning holes are asymmetrical or unevenly distributed relative to the center O.

[0037] As a further improvement of the present invention, an opening is provided in the middle of the single-layer mesh.

[0038] The high-gradient magnetic separator of the present invention uses diamond-shaped mesh stacking. First, the cutting process of single-layer mesh on diamond steel mesh is designed. According to certain rules, N single-layer meshes are cut and then stacked in sequence to form a mesh combination. The mesh combination is further stacked to form the diamond-shaped mesh stack of the high-gradient magnetic separator of the present invention. The aim is to ensure that the connecting ridges of any single-layer mesh are located in the mesh area of ​​the adjacent single-layer mesh, and the first or second ridges only have a simple intersection relationship and will not obstruct the ridges. This allows full use of the sharp corners on the ridges to concentrate magnets. The regular arrangement also avoids the formation of particularly small gaps that could cause blockage.

[0039] The diamond-shaped mesh stacking for the high-gradient magnetic separator of the present invention is suitable for magnetic separation applications such as impurity removal of non-metallic minerals with high content of weak magnetic impurities or enrichment of weak magnetic metallic minerals. The specific size parameters can be determined based on small-scale mineral processing experimental data. It is necessary to ensure that the non-magnetic mineral particles in the raw ore can pass through without obstruction, and that the mesh ridges have sufficient magnetic adsorption force on the weak magnetic mineral particles.

[0040] The diamond-shaped mesh stacking for the high-gradient magnetic separator of the present invention has the following beneficial effects:

[0041] 1. The flow channels within the stack are evenly distributed;

[0042] 2. The mesh ridge has a large effective adsorption area;

[0043] 3. It can avoid blockages;

[0044] 4. Improved the utilization efficiency of magnetic media. Attached Figure Description

[0045] Figure 1 This is a front view of a stack of diamond-shaped mesh sheets used in a high-gradient magnetic separator according to the present invention.

[0046] Figure 2 This is a side view of the stacked diamond-shaped mesh sheets used in the high-gradient magnetic separator of the present invention;

[0047] Figure 3 This is a front view of the mesh assembly of the present invention;

[0048] Figure 4 for Figure 3 A magnified view of a portion of the image;

[0049] Figure 5 This is a front view of the single-layer mesh of the present invention;

[0050] Figure 6 This is a partially enlarged schematic diagram of the single-layer mesh of the present invention;

[0051] Figure 7 This is a front view of the first layer of the mesh assembly of the present invention;

[0052] Figure 8 for Figure 7 A magnified view of a portion of the image;

[0053] Figure 9 This is a front view of the second layer of the mesh assembly of the present invention;

[0054] Figure 10 for Figure 7 A magnified view of a portion of the image;

[0055] Figure 11 This is a front view of the third layer of the mesh assembly of the present invention;

[0056] Figure 12 for Figure 7 A magnified view of a portion of the image;

[0057] Figure 13 A schematic diagram showing the usage status of the positioning pin seat;

[0058] Figure 14 A front view of a single-layer mesh used in a multi-cavity parallel magnetic separation tank or a multi-cavity series dual magnetic separation tank;

[0059] Figure 15 This is a front view of a combination of mesh sheets or a stack of diamond mesh sheets used in a multi-cavity parallel magnetic separation tank or a multi-cavity series dual magnetic separation tank. Detailed Implementation

[0060] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0061] The overall structure of the diamond-shaped mesh stacked in the high-gradient magnetic separator of the present invention is as follows: Figure 1 , Figure 2 As shown, it is composed of... Figure 3 The several sets of mesh panels shown are stacked in sequence.

[0062] And such Figure 3 , Figure 4 The mesh combination 2 shown consists of N meshes as follows: Figures 5-8 The single-layer mesh shown is formed by stacking the mesh in a regular order.

[0063] The single-layer mesh of the present invention has the following specific structure: Figures 5-6 As shown, the diamond-shaped steel mesh is made by punching with a toothed die and then cut and processed according to certain rules.

[0064] Each mesh 14 of the diamond-shaped steel mesh has 6 sides around it, which are parallel to each other; among them, the connecting mesh 13 connects two adjacent meshes vertically, and the two connected mesh ridges are the first mesh ridge 11 and the second mesh ridge 12 according to the arrangement direction.

[0065] The thickness of the connecting ridge 13 is generally twice the thickness of the first ridge 11 or the second ridge 12.

[0066] The length of the connecting ridge 13 is significantly shorter than the length of the first ridge 11 or the second ridge 12.

[0067] To accommodate the use of high gradient magnetic separators, the outer ring of the single-layer mesh 1 is generally circular to match the circular magnetic cavity.

[0068] In a single mesh 14, the diagonal direction parallel to the connecting mesh ridge 13 is defined as the x-direction, which serves as the translation direction of a single layer of mesh 1 when making mesh assemblies.

[0069] In mesh assembly 2, a single-layer mesh 1 needs to be set up according to certain rules.

[0070] like Figure 3 , Figure 4 As shown, in mesh combination 2, there are N single-layer meshes, where N≥2.

[0071] The outer edge of the single-layer mesh 1 is circular, and the center of the circle is defined as "O".

[0072] In a single-layer mesh 1, the distance between two adjacent meshes 14 in the x direction is “L”.

[0073] The center O of the adjacent mesh layer is shifted by a distance P along the x-direction relative to its position in mesh 14.

[0074] P = L / N.

[0075] Furthermore, the nth mesh has the same translation direction relative to the (n-1)th mesh; n = 2 to N.

[0076] Therefore, when the mesh assembly 2 is further stacked to form the diamond mesh stack for the high gradient magnetic separator of the present invention, the connecting ridge 13 of any single layer mesh 1 is located in the mesh area 14 of the adjacent single layer mesh 1, and the first ridge 11 or the second ridge 12 only has a simple intersection relationship and will not block the ridge. Thus, the sharp corners on the ridge can be fully utilized to concentrate magnets and arrange them in a regular manner, and the formation of particularly small gaps can be avoided to prevent blockage.

[0077] In this embodiment, N = 3; therefore, the specific single-layer mesh 1 is the first layer mesh 21, the second layer mesh 22, and the third layer mesh 23, with the specific structure as follows: Figures 7-12 As shown.

[0078] First layer mesh 21, as shown Figure 7 , Figure 8 As shown, the center O1 is located to the left of mesh 14.

[0079] The second layer of mesh 22, as shown Figure 9 , Figure 10 As shown, the center O2 of the second layer mesh 22 is translated by a distance P relative to the center O1 of the first layer mesh 21, and the center O2 is located in the middle of the mesh 14.

[0080] The third layer of mesh 23, as shown Figure 11 , Figure 12 As shown, the center O3 of the third mesh 23 is shifted by a distance P relative to the center O2 of the second mesh 22, and the center O3 is located to the right of the mesh 14.

[0081] The first layer of mesh 21, the second layer of mesh 22, and the third layer of mesh 23 form a minimum repeating unit, that is, they are stacked in sequence to form mesh combination 2.

[0082] To facilitate stacking, positioning holes 15 are provided on the single-layer mesh 1; the positioning holes 15 can be round holes, and their positions are located with the center O; in this embodiment, the positioning holes 15 are round holes, and there are 3 of them; the diameter of the positioning holes 15 is larger than the short pitch of the rhomboid mesh, generally more than 1.5 times the short pitch.

[0083] Therefore, when stacking, one positioning pin can be set first, such as... Figure 13 As shown, the base 31 is provided with positioning pins 32 that match the diameter, number, and position of the positioning holes 15; in this way, single-layer mesh sheets 1 can be stacked sequentially through the positioning pin seats to form mesh sheet assembly 2 and finally form the diamond mesh sheet stack for the high gradient magnetic separator of the present invention. Preferably, there are more than three positioning holes 15 with different diameters, and the corresponding positioning pins 32 are also different in size, which can facilitate quick identification and positioning of the front and back sides and angular positions of the single-layer mesh sheet 1.

[0084] When applied in multi-cavity parallel magnetic separators or multi-cavity series dual magnetic separators, the stacked structure of the single-layer mesh 1 and the diamond-shaped mesh for the high-gradient magnetic separator of the present invention is as follows: Figure 14 , Figure 15 As shown, there is an opening in the middle.

[0085] The diamond-shaped mesh stacking for the high-gradient magnetic separator of the present invention is suitable for magnetic separation applications such as impurity removal of non-metallic minerals with high content of weak magnetic impurities or enrichment of weak magnetic metallic minerals. The specific size parameters can be determined based on small-scale mineral processing experimental data. It is necessary to ensure that the non-magnetic mineral particles in the raw ore can pass through without obstruction, and that the mesh ridges have sufficient magnetic adsorption force on the weak magnetic mineral particles.

[0086] The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the embodiments described. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and these equivalent modifications or substitutions are all included within the scope defined by the claims of this application.

Claims

1. A stack of diamond mesh sheets for use in the magnetic concentrate media of a high gradient magnetic separator, characterised in that, The mesh combination is formed by sequentially stacking a plurality of mesh groups; Each mesh group is formed by sequentially stacking N single-layer meshes in a regular order; N≥2; The single-layer mesh is formed by cutting and processing a diamond-shaped steel mesh punched by a tooth-shaped die; The diamond-shaped steel mesh is provided with six edges around each mesh, two by two parallel; among them, the two edges that connect two adjacent mesh vertically are connecting mesh edges, and the two edges connected to them are single mesh edges, which are the first mesh edge and the second mesh edge, respectively; The thickness of the connecting mesh edge is twice the thickness of the first mesh edge or the second mesh edge; The length of the connecting mesh edge is shorter than the length of the first mesh edge or the second mesh edge; The outer circle of the single-layer mesh is circular; the center is "O"; In a single mesh, the diagonal direction parallel to the connecting mesh edge is the x direction; In a single-layer mesh, the distance between two adjacent meshes in the x direction is "L"; In the same mesh group, the N single-layer meshes are translated and cut from the diamond-shaped steel mesh along the x direction; In the same mesh group, the centers O of the single-layer meshes of two adjacent layers are translated by a distance P in the x direction relative to the position in the mesh; P=L / N; In the same mesh group, the translation direction of the center O of the nth single-layer mesh relative to the (n-1)th single-layer mesh is consistent; n=2~N; When the mesh combinations of adjacent layers are stacked into a diamond mesh stack, the first mesh of the previous mesh combination is arranged adjacent to the Nth mesh of the next mesh combination, and the directions of the connecting mesh edges of the single-layer meshes in the mesh combinations of adjacent layers are consistent.

2. A diamond mesh stack for a high gradient magnetic separator's magnetic concentrating medium as claimed in claim 1, wherein, N=3； The three single-layer meshes in the same mesh group are the first layer mesh, the second layer mesh, and the third layer mesh, respectively; The center O1 of the first layer mesh is located on the left side of the mesh; The center O2 of the second layer mesh is translated by a distance P relative to the center O1 of the first layer mesh, and the center O2 is located in the middle of the mesh; The center O3 of the third layer mesh is translated by a distance P relative to the center O2 of the second layer mesh, and the center O3 is located on the right side of the mesh; The first layer mesh, the second layer mesh, and the third layer mesh are sequentially stacked to form a mesh combination.

3. A diamond mesh stack for a high gradient magnetic separator's polus, according to claim 1 or 2, characterized in that, Positioning holes are provided on the single-layer mesh; the positions of the positioning holes relative to the center O and the x-axis direction are fixed.

4. A diamond mesh stack for a high gradient magnetic separator's polus magnetic media as claimed in claim 3, wherein, The positioning hole is a circular hole, and the diameter of the positioning hole is greater than the short pitch of the diamond mesh; The diameter of the positioning hole is 1.5 times or more of the short pitch of the diamond mesh.

5. A diamond mesh stack for a high gradient magnetic separator's polus, according to claim 3 or 4, characterized in that, The number of positioning holes is two or more.

6. A diamond mesh stack for high gradient magnetic separator poly-magnetic media as claimed in claim 5, wherein, The diameters of the two or more positioning holes are different.

7. A diamond mesh stack for high gradient magnetic separator poly-magnetic media as claimed in claim 5, wherein, The positions of the two or more positioning holes relative to the center O and the x-axis direction are asymmetric.

8. The diamond mesh stack for a high gradient magnetic separator's polus magnetic media of claim 5, wherein, The positions of the three or more positioning holes relative to the center O are asymmetric or unevenly distributed.

9. The diamond mesh stack for a high gradient magnetic separator's polus magnetic media of claim 1, wherein, The single-layer mesh is provided with an opening in the middle.

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