A dry grinding dry separation apparatus system and method of use

Abstract

The application discloses a dry grinding and dry selecting equipment system and a use method, relates to the technical field of dry grinding and dry selecting metal powder, and comprises a high-pressure roller mill, a dry screening equipment, a dry selecting machine, a vertical mill and a power powder selecting machine.

Description

Technical Field

[0001] This invention patent relates to the field of dry grinding and dry separation of metal powder technology, specifically a dry grinding and dry separation equipment system and its usage method. Background Technology

[0002] Dry grinding and dry separation of metal powders refers to a processing technology in which metals or metal-containing minerals are ground and pulverized in a dry state without the use of liquid media such as water, and the metal powders are simultaneously separated and purified by methods such as magnetic separation.

[0003] The process includes:

[0004] Crushing and grinding: The raw ore is crushed in multiple stages and then fed into equipment such as a dry ball mill for grinding to achieve the fineness of monomer liberation.

[0005] Grading and magnetic separation: The ground powder is separated into coarse and fine powder by an air classifier (such as a rotary classifier). Qualified fine powder is then fed into a dry magnetic separator by air, where magnetic metal powder is separated from non-magnetic gangue (tailings) by utilizing magnetic differences to obtain concentrate. For example, existing technology CN202311084923.5 describes a dry grinding and separation device and method for magnetite, including separation and magnetic adsorption of the ore.

[0006] Existing dry separation systems all use a high-pressure roller mill and a closed-circuit dry screen to a particle size of about 2mm. This is because dry screens cannot classify finer ores, such as those at the 0.5mm level. Secondly, rich ores at 2mm are not sufficiently liberated, making it impossible to directly obtain qualified concentrate. Furthermore, existing magnetic adsorption methods cannot quickly extract metal powder from the ores.

[0007] Therefore, there is an urgent need to propose a dry grinding and dry separation equipment system and its usage method to solve the above problems. Summary of the Invention

[0008] To overcome the above deficiencies, the present invention provides a dry grinding and dry separation equipment system and its usage method, which solves the technical problems that existing mineral materials cannot be classified to the 0.5mm level and cannot quickly adsorb and extract metal powder.

[0009] To achieve the above objectives, the present invention adopts the following technical solution:

[0010] A dry grinding and dry separation equipment system includes: a high-pressure roller mill for primary grinding of raw materials;

[0011] Dry screening equipment is used to screen and classify the raw materials after primary grinding to 2±0.5mm;

[0012] The dry separator includes a frame, a feed inlet at the top of the frame, a high-level cylinder and a low-level cylinder installed inside the frame, the bottom of the high-level cylinder being connected to the low-level cylinder, and a concentrate outlet and a tailings outlet at the bottom of the dry separator.

[0013] The vertical mill has a side-mounted feed inlet that connects to the concentrate outlet of the dry separator;

[0014] Powered air classifier;

[0015] The tail feeder has a feeding chamber and a spiral magnetic system inside; a spiral air pipe is installed at the bottom and a nozzle is installed upward; the end of the spiral air pipe is connected to an external air circuit to deliver compressed gas into the spiral air pipe; a tailings inlet is installed at the top and a return pipeline is set to connect to the feed inlet of the dry separator to form a circulating dry grinding and dry separation circuit, and grinds the raw material particles to less than 0.5mm.

[0016] In a further technical solution, the tail feeder includes a main cylinder with a conical bottom and a discharge pipe at the center, and a discharge valve is provided at the bottom of the discharge pipe.

[0017] A branch of the discharge pipe is connected to a guide pipe, which is connected to the return pipe at the top;

[0018] A sampling tube is installed on the other side of the discharge pipe for particle size detection of the raw materials.

[0019] In a further technical solution, a feed pipe is provided laterally on the upper part of the tail feeder, and the feed pipe is connected to the main cylinder; an annular feed plate is installed in the main cylinder, and a feed port is provided at the bottom of the annular feed plate for pouring raw materials into the main cylinder.

[0020] A tail pipe is provided in the middle of the annular feeding disc, and the bottom of the tail pipe extends into the main cylinder and is located below the annular feeding disc.

[0021] In a further technical solution, the annular feeding disc is inclined and tilted downwards on the opposite side from the direction in which the material enters the main cylinder from the feeding pipe.

[0022] The tailing pipe has a circular flared opening at the bottom of the annular feeding tray, and the bottom diameter is larger than the tailings outlet diameter. The circular flared opening does not interfere with the spiral magnetic system.

[0023] In a further technical solution, a pulley one is installed on the tail pipe located above the annular feeding disc; a drive motor is installed outside the main cylinder, with the output end of the drive motor facing upward and a pulley two installed thereon; a transmission belt is installed between pulley one and pulley two.

[0024] A protective shell is installed on the drive motor. The protective shell covers the pulleys and has a position tube at the bottom. The bottom of the position tube is connected to the guide tube.

[0025] The tail pipe is connected to the main cylinder via a first mounting bearing; the top is connected to the return pipe via a second mounting bearing.

[0026] In a further technical solution, the spiral magnetic system includes a magnetic shell and magnetic steel plates. The magnetic shell is fixedly connected to the inner wall of the main cylinder, and multiple sets of magnetic steel plates are provided and constrained between the magnetic shell and the main cylinder. The spiral magnetic system is located above the spiral air pipe.

[0027] In a further technical solution, a double-line slide rail is installed inside the magnetic shell, and a magnetic inlet and a magnetic outlet are opened on the main cylinder at both the upper and lower ends of the magnetic shell, with the magnetic inlet located above the magnetic outlet; the double-line slide rail is spirally arranged.

[0028] The spiral magnetic system includes a support block, and multiple sets of magnetic steel plates are fixedly installed inside the support block; the support block has a sliding opening, which is adapted to be installed on a double-line slide rail for sliding along the double-line slide rail.

[0029] A method of using a dry grinding and dry separation equipment system includes the following steps:

[0030] Step 1, initial grinding: Adjust and set the spacing of the high-pressure roller mill, pour the raw material into the high-pressure roller mill, control the particle size at 1.5-2.5mm; and screen it through the dry screening equipment. Unqualified products are subjected to secondary initial grinding, and qualified products enter the dry separator.

[0031] Step 2: Pass the qualified product from Step 1 through the feed, select the concentrate from the product, and reduce the amount of non-metallic raw materials.

[0032] Step 3: The vertical mill grinds the concentrate and feeds it into the power classifier from the top. The power classifier screens the concentrate to form powder, which is then fed into the feed pipe of the tail feeder.

[0033] Step 4: The feed pipe pours the powder into the main cylinder through the annular feeding disc. The drive motor drives the tail pipe to rotate synchronously, causing the powder to fall downward along the circular horn opening and the inner wall of the main cylinder. The smaller metal powders are attracted to the surface of the magnetic shell by the magnetic steel plate. The bottom spiral air pipe blows compressed gas upward into the main cylinder, causing the larger metal powders and non-metal powders that cannot be attracted to be blown into the tail pipe and then conveyed upward through the return pipeline to the feed port of the dry separator, forming secondary magnetic separation and abrasion.

[0034] Step 5: When it is necessary to remove the metal powder adsorbed by the magnetic steel plate inside the main cylinder, open the bottom magnetic discharge port and the top magnetic inlet port, introduce gas into the magnetic inlet port, push multiple sets of bearing blocks to slide along the double-line slide rail to discharge the magnetic shell, and simultaneously drive the metal powder to move downward to the bottom and fall into the discharge pipe.

[0035] Step 6: If the particles pass the inspection of the discharge pipe, they are discharged through the discharge valve; otherwise, they are pumped back into the return pipe through the guide pipe.

[0036] The present invention has the following beneficial effects:

[0037] This invention utilizes a spirally arranged magnetic system within the main cylinder. Material falls downwards under the influence of the magnetic field and its own weight. A spiral air pipe at the lower conical opening sprays a large volume of compressed air into the cylinder through nozzles, generating an upward airflow. During this descent, the material is continuously dispersed by the combined forces of magnetism and airflow. In this dispersion process, smaller metal powders are attracted to the surface of the magnetic shell by the magnetic plates; larger metal and non-metal powders are blown into the tail section; and unqualified materials are conveyed through a guide pipe to the feed inlet of a dry separator. After secondary separation and grinding, the larger particles are fed back into the tail section separator for further separation, thereby controlling the metal powder to a particle diameter of 0.5 mm.

[0038] This invention features multiple sets of sliding, interconnected support blocks, each containing a built-in magnetic steel plate. These plates generate magnetism on the surface of the magnetic shell, attracting smaller metal powder particles from the material. Once the material is selected, if the magnetic steel plate remains fixed inside the magnetic shell, the metal powder is difficult to fall out of the main cylinder. This invention utilizes a double-line slide rail to facilitate the entry and exit of the support blocks. When not disassembled, the inlet and outlet magnetic ports are closed, confining the support blocks within the main cylinder. When metal powder needs to be removed, the inlet and outlet magnetic ports are opened, allowing compressed gas to pass through. This pushes the head support block, causing it to slide along the double-line slide rail, detaching the support blocks from the main cylinder. The moving support blocks then cause the metal powder on the magnetic shell surface to spiral downwards until it detaches from the magnetic shell at the bottom, completing rapid unloading without disassembling the main cylinder or magnetic steel plate. Attached Figure Description

[0039] Figure 1 This is a schematic diagram of the dry grinding and dry separation equipment system of the present invention;

[0040] Figure 2 This is a schematic diagram of the tail feeder of the present invention;

[0041] Figure 3 This is a cross-sectional view of the tail feeder of Embodiment 1 of the present invention;

[0042] Figure 4 for Figure 3 Enlarged view of part A;

[0043] Figure 5 This is a schematic cross-sectional view of the tail feeder of Embodiment 2 of the present invention;

[0044] Figure 6 for Figure 5 Enlarged view of part B;

[0045] Figure 7 for Figure 5 Enlarged view of part C;

[0046] Figure 8 This is a schematic diagram of the structure of the bearing block of the present invention. Figure 1 ;

[0047] Figure 9 This is a schematic diagram of the structure of the bearing block of the present invention. Figure 2 ;

[0048] Figure 10 This is a schematic diagram of the movement of the bearing block on the double-sided slide rail according to the present invention;

[0049] Figure 11 This is a front view of the dry separator of the present invention.

[0050] legend:

[0051] 1. High-pressure roller mill;

[0052] 2. Dry screening equipment;

[0053] 3. Dry separator; 31. Frame; 32. High-level cylinder; 33. Low-level cylinder; 34. Feed hopper; 35. Dust collection port; 36. Rotary feeder;

[0054] 4. Vertical mill; 5. Power classifier;

[0055] 6. Tail feeder; 61. Main cylinder; 62. Discharge pipe; 63. Discharge valve; 64. Guide pipe; 65. Sampling pipe; 66. Feed pipe; 67. Annular feed tray; 68. Tail feed pipe; 69. Circular bell mouth; 610. Pulley one; 611. Drive motor; 612. Pulley two; 613. Transmission belt; 614. Protective shell; 615. Positioning pipe;

[0056] 7. Helical magnetic system; 71. Magnetic shell; 72. Magnetic steel plate; 73. Double-line slide rail; 74. Bearing block; 75. Sliding port;

[0057] 8. Spiral air tube; 81. Nozzle;

[0058] 9. Return pipeline. Detailed Implementation

[0059] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0060] Example 1

[0061] like Figure 1-4 This is one embodiment of the present invention, specifically a dry grinding and dry separation equipment system, comprising:

[0062] like Figure 1 The high-pressure roller mill 1 shown is used for initial grinding of raw materials;

[0063] Dry screening equipment 2 screens the raw materials after primary grinding and classifies them to 2±0.5mm;

[0064] The dry separator 3 includes a frame 31, with a feed inlet at the top of the frame 31. A high-level cylinder 32 and a low-level cylinder 33 are installed inside the frame 31. The bottom of the high-level cylinder 32 is connected to the bottom of the low-level cylinder 33. A concentrate outlet and a tailings outlet are provided at the bottom of the dry separator 3.

[0065] The vertical mill 4 has a side feed inlet that is connected to the concentrate outlet of the dry separator 3;

[0066] 5-speed power classifier;

[0067] The tail feeder 6 has a feeding chamber inside and a spiral magnetic system 7 installed; a spiral air pipe 8 is installed at the bottom and a nozzle 81 is installed upward; the end of the spiral air pipe 8 is connected to an external air passage for conveying compressed gas into the spiral air pipe 8; a tailings inlet is installed at the top and a return pipe 9 is installed to connect to the feed inlet of the dry separator 3 to form a circulating dry grinding and dry separation circuit, and grind the raw material particles to less than 0.5mm.

[0068] This invention employs a high-pressure roller mill and dry screening equipment to classify raw materials into particles down to approximately 2mm. The dry separator uses a dual-cylinder high-low configuration for two-stage magnetic separation of the ore. Subsequently, the material is ground in a vertical mill, screened by a power classifier, and then the qualified product is separated by a tailings separator. Unqualified products require a second dry separator process, achieving the goal of maximizing concentrate grade in the first stage and ensuring tailings grade in the second stage.

[0069] like Figure 2 As shown, the tail feeder 6 includes a main cylinder 61 with a conical bottom and a discharge pipe 62 in the center. A discharge valve 63 is installed at the bottom of the discharge pipe 62. The discharge valve is an electrically controlled valve that can remotely control the discharge. A guide pipe 64 is connected to one side of the discharge pipe 62, and the guide pipe 64 is connected to the return pipe 9 at the top. A sampling pipe 65 is installed on the other side of the discharge pipe 62 for particle size detection of the raw materials.

[0070] A feed pipe 66 is provided laterally on the upper part of the tail feeder 6, and the feed pipe 66 connects to the main cylinder 61; for example Figure 3 and 4As shown, the spiral magnetic system 7 includes a magnetic shell 71 and a magnetic steel plate 72. The magnetic shell 71 is fixedly connected to the inner wall of the main cylinder 61. Multiple sets of magnetic steel plates 72 are provided and constrained between the magnetic shell 71 and the main cylinder 61. The spiral magnetic system 7 is located above the spiral air pipe 8.

[0071] This invention utilizes a spirally arranged magnetic system within the main cylinder. Material falls downwards under the influence of the magnetic field and its own weight. At the lower conical opening, a spiral air pipe with nozzles injects a large volume of compressed air into the cylinder, generating an upward airflow. During this descent, the material is continuously dispersed by both magnetic and airflow forces. During this dispersion process, smaller metal powders are attracted to the magnetic shell surface by the magnetic plates; larger metal and non-metal powders are blown into the tail section pipe; and unqualified materials are conveyed through a guide pipe to the feed inlet of a dry separator. After secondary separation, the larger particles are ground and then fed back into the tail section separator for further separation.

[0072] Example 2

[0073] like Figure 5-10 As shown, another embodiment of the present invention is provided. Based on embodiment 1, an annular feeding tray 67 is installed inside the main cylinder 61. The bottom of the annular feeding tray 67 is provided with a feeding port for pouring raw materials into the main cylinder 61.

[0074] A tail pipe 68 is provided in the middle of the annular feeding plate 67. The bottom of the tail pipe 68 extends into the main cylinder 61 and is located below the annular feeding plate 67.

[0075] like Figure 6 As shown, the annular feeding tray 67 is inclined and tilted downwards on the other side from the direction in which it enters the main cylinder 61 from the feeding pipe 66; the tilt angle should not be too large and should be controlled at 1-5°, which is conducive to the downward discharge of the concentrated material.

[0076] The tailing pipe 68 has a circular flared opening 69 at the bottom of the annular feed pan 67, and the bottom diameter is larger than the tailings opening diameter. The circular flared opening 69 does not interfere with the spiral magnetic system 7.

[0077] like Figure 6 As shown, a pulley 610 is installed on the tail pipe 68 located above the annular feed pan 67; a drive motor 611 is installed outside the main cylinder 61, and a pulley 612 is installed on the output end of the drive motor 611 facing upward; a transmission belt 613 is installed between the pulley 610 and the pulley 612.

[0078] A protective shell 614 is installed on the drive motor 611. The protective shell 614 covers the pulley 612 and has a position tube 615 at the bottom. The bottom of the position tube 615 is connected to the guide tube 64. The drive motor can be a stepper motor.

[0079] The tail pipe 68 is connected to the main cylinder 61 by a first mounting bearing; the top is connected to the return pipe 9 by a second mounting bearing.

[0080] This invention uses a drive motor to rotate the second drive pulley at a low speed, which in turn rotates the tail pipe, preventing material buildup at the circular flared opening and facilitating material descent.

[0081] like Figure 7 As shown, a double-line slide rail 73 is installed inside the magnetic shell 71, and magnetic inlet and magnetic outlet ports are opened on the main cylinder 61 at both the upper and lower ends of the magnetic shell 71, with the magnetic inlet port located above the magnetic outlet port; the double-line slide rail 73 is spirally arranged; the spiral magnetic system 7 includes a support block 74, within which multiple sets of magnetic steel plates 72 are fixedly installed; the support block 74 has a sliding opening 75, such as... Figure 8 As shown, the adapter is mounted on the double-wire slide rail 73 for sliding along the double-wire slide rail 73. The magnetic inlet and magnetic outlet are configured as follows: Figure 10 As shown, a double-line slide rail with a bend is provided to facilitate the entry and exit of the load-bearing block.

[0082] like Figure 11 As shown, the present invention includes a dry material bin 34 installed on the high-level cylinder of the dry separator. The dry material bin is shell-shaped and contains a material distribution plate connected to a rotary feeder 36. The feeding is controlled by adjusting the angle of the material distribution plate using the rotary feeder 36. A dust collection port 35 is also installed on the outer side, providing excellent dust prevention compared to traditional vibratory feeding methods. Furthermore, compared to traditional vibratory feeding methods, it reduces vibration noise, facilitating green mineral processing construction.

[0083] This invention features multiple sets of sliding, interconnected support blocks. Each support block contains a built-in magnetic steel plate, which generates magnetism on the surface of the magnetic shell, thereby attracting smaller metal powder particles from the material. After material selection, if the magnetic steel plate is fixed inside the magnetic shell, the metal powder is unlikely to fall out of the main cylinder. This invention uses a double-line slide rail to facilitate the entry and exit of the support blocks. When not removed, the inlet and outlet magnetic ports are closed, constraining the multiple sets of support blocks within the main cylinder. When metal powder needs to be removed, the inlet and outlet magnetic ports are opened, allowing compressed gas to pass through the inlet, pushing the head support block and causing it to slide along the double-line slide rail. This allows the multiple sets of support blocks to detach from the main cylinder. The moving support blocks then cause the metal powder on the surface of the magnetic shell to spiral downwards until it detaches from the magnetic shell at the bottom, completing the material removal process.

[0084] A method of using a dry grinding and dry separation equipment system includes the following steps:

[0085] Step 1, initial grinding: Adjust and set the spacing of the high-pressure roller mill 1, pour the raw material into the high-pressure roller mill 1, control the particle size at 1.5-2.5mm; and screen it through the dry screening equipment 2. Unqualified products are subjected to secondary initial grinding, and qualified products enter the dry separator 3.

[0086] Step 2: Pass the qualified product from Step 1 through the feed, select the concentrate from the product, and reduce the amount of non-metallic raw materials.

[0087] Step 3: The vertical mill 4 grinds the concentrate and feeds it into the power classifier 5 from the top. The power classifier 5 screens the concentrate to form powder, which is then fed into the feed pipe 66 of the tail feeder 6.

[0088] Step 4: The feed pipe 66 pours the powder into the main cylinder 61 through the annular feed plate 67. The drive motor 611 drives the tail pipe 68 to rotate synchronously, so that the powder falls downward along the circular horn mouth 69 and the inner wall of the main cylinder 61. The smaller metal powder is attracted to the surface of the magnetic shell 71 by the magnetic steel plate 72. The bottom spiral air pipe 8 blows compressed gas upward into the main cylinder 61, so that the larger metal powder and non-metal powder that cannot be attracted are blown into the tail pipe 68 and conveyed upward through the return pipe 9 to the feed port of the dry separator 3 to form secondary magnetic separation and abrasion.

[0089] Step 5: When it is necessary to remove the metal powder adsorbed by the magnetic steel plate 72 inside the main cylinder 61, open the bottom magnetic discharge port and the top magnetic inlet port, introduce gas into the magnetic inlet port, push multiple sets of bearing blocks 74 to slide along the double-line slide rail 73 to discharge the magnetic shell 71, and simultaneously drive the metal powder to move downward to the bottom and fall into the discharge pipe 62.

[0090] Step 6: After the particles pass the inspection by the discharge pipe 62, they are discharged through the discharge valve 63; otherwise, they are pumped back into the return pipe through the guide pipe 64.

[0091] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A dry grinding and dry separation equipment system, characterized in that, include: High-pressure roller mill (1) is used for initial grinding of raw materials; Dry screening equipment (2) screens the raw materials after primary grinding and classifies them to 2±0.5mm; The dry separator (3) includes a frame (31), a feed inlet is provided at the top of the frame (31), and a high-level cylinder (32) and a low-level cylinder (33) are installed inside the frame (31). The bottom of the high-level cylinder (32) is connected to the bottom of the low-level cylinder (33), and a concentrate outlet and a tailings outlet are provided at the bottom of the dry separator (3). The vertical mill (4) has a side feed inlet that is connected to the concentrate outlet of the dry separator (3); Powered air classifier (5); The tail feeder (6) has a feeding chamber inside and a spiral magnetic system (7) installed. A spiral air pipe (8) is installed at the bottom and a nozzle (81) is installed upward. The end of the spiral air pipe (8) is connected to an external air passage to transport compressed gas into the spiral air pipe (8). A tailings inlet is installed at the top and a return pipe (9) is installed to connect to the feed inlet of the dry separator (3) to form a circulating dry grinding and dry separation circuit, and grind the raw material particles to less than 0.5 mm.

2. The dry grinding and dry separation equipment system according to claim 1, characterized in that, The tail feeder (6) includes a main cylinder (61), which is conical at the bottom and has a discharge pipe (62) in the center. A discharge valve (63) is provided at the bottom of the discharge pipe (62). A branch of the discharge pipe (62) is connected to a guide pipe (64), which is connected to the return pipe (9) at the top. A sampling tube (65) is provided on the other side of the discharge pipe (62) for particle size detection of the raw materials.

3. The dry grinding and dry separation equipment system according to claim 2, characterized in that, The upper side of the tail feeder (6) is provided with a feed pipe (66), which is connected to the main cylinder (61); an annular feed plate (67) is installed in the main cylinder (61), and a feed port is provided at the bottom of the annular feed plate (67) for pouring raw materials into the main cylinder (61); A tail pipe (68) is provided in the middle of the annular feed pan (67). The bottom of the tail pipe (68) extends into the main cylinder (61) and is located below the annular feed pan (67).

4. The dry grinding and dry separation equipment system according to claim 3, characterized in that, The annular feeding disc (67) is inclined, and the direction of feeding from the feeding pipe (66) into the main cylinder (61) is inclined downward on the other side; The tailing pipe (68) has a circular horn mouth (69) at the bottom of the annular feed pan (67), and the bottom diameter is larger than the tailings opening diameter. The circular horn mouth (69) does not interfere with the spiral magnetic system (7).

5. A dry grinding and dry separation equipment system according to claim 4, characterized in that, A pulley (610) is installed on the tail pipe (68) located above the annular feed pan (67); a drive motor (611) is installed outside the main cylinder (61), and a pulley (612) is installed on the output end of the drive motor (611) facing upward; a transmission belt (613) is installed between the pulley (610) and the pulley (612). A protective shell (614) is installed on the drive motor (611). The protective shell (614) covers the pulley two (612) and has a position tube (615) at the bottom. The bottom of the position tube (615) is connected to the guide tube (64). The tail pipe (68) is connected to the main cylinder (61) by a mounting connecting bearing; the top is connected to the return pipe (9) by a mounting connecting bearing.

6. The dry grinding and dry separation equipment system according to claim 4, characterized in that, The spiral magnetic system (7) includes a magnetic shell (71) and a magnetic steel plate (72). The magnetic shell (71) is fixedly connected to the inner wall of the main cylinder (61). Multiple sets of magnetic steel plates (72) are provided and constrained between the magnetic shell (71) and the main cylinder (61). The spiral magnetic system (7) is located above the spiral air pipe (8).

7. A dry grinding and dry separation equipment system according to claim 6, characterized in that, The magnetic shell (71) is equipped with a double-line slide rail (73), and magnetic inlet and magnetic outlet are provided on the main cylinder (61) at both the upper and lower ends of the magnetic shell (71). The magnetic inlet is located above the magnetic outlet. The double-line slide rail (73) is spirally arranged. The spiral magnetic system (7) includes a support block (74), and multiple sets of magnetic steel plates (72) are fixedly installed inside the support block (74); a sliding port (75) is opened on the support block (74), which is adapted to be installed on the double-line slide rail (73) for sliding along the double-line slide rail (73).

8. A method of using a dry grinding and dry separation equipment system, characterized in that, Includes the following steps: Step 1, initial grinding: Adjust and set the spacing of the high-pressure roller mill (1), pour the raw material into the high-pressure roller mill (1), control the particle size at 1.5-2.5mm; and screen it through the dry screening equipment (2). Unqualified products are subjected to secondary initial grinding, and qualified products enter the dry separator (3). Step 2: Pass the qualified product from Step 1 through the feed, select the concentrate from the product, and reduce the amount of non-metallic raw materials. Step 3: The vertical mill (4) grinds the concentrate and feeds it into the power classifier (5) from the top. The power classifier (5) screens the concentrate to form powder, which is then fed into the feed pipe (66) of the tail feeder (6). Step 4: The feed pipe (66) pours the powder into the main cylinder (61) through the annular feed plate (67). The drive motor (611) drives the tail pipe (68) to rotate synchronously, so that the powder falls down along the circular horn mouth (69) and the inner wall of the main cylinder (61). The smaller metal powder is attracted to the surface of the magnetic shell (71) by the magnetic steel plate (72). The bottom spiral air pipe (8) blows the compressed gas upward into the main cylinder (61), so that the larger metal powder and non-metal powder that cannot be attracted are blown into the tail pipe (68) and conveyed upward through the return pipe (9) to the feed port of the dry separator (3) to form secondary magnetic separation and grinding. Step 5: When it is necessary to remove the metal powder adsorbed by the magnetic steel plate (72) inside the main cylinder (61), open the bottom magnetic discharge port and the top magnetic inlet port, introduce gas from the magnetic inlet port, push multiple sets of bearing blocks (74) to slide along the double-line slide rail (73) to discharge the magnetic shell (71), and simultaneously drive the metal powder to move downward to the bottom and fall into the discharge pipe (62). Step 6: After the particles are inspected and found to be qualified through the discharge pipe (62), they are discharged through the discharge valve (63); Otherwise, it is pumped back into the return pipe through the guide pipe (64).

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