Acid-resistant ball milling system

Abstract

The invention relates to an acid-resistant ball milling system which comprises a feeding mechanism, a ball mill and a drum screen, the feeding mechanism comprises a sand setting feeding device, a belt feeding chute and a buffer feeding bin, and outlets of the sand setting feeding device and the belt feeding chute are both communicated with a stock bin of the buffer feeding bin; rubber lining plates are arranged on the inner wall of the sand setting feeding device and the inner wall of the buffering feeding bin. A chute body of the belt feeding chute is of a structure with the thick bottom wall and the thin side wall. Three layers of acid-resistant and corrosion-resistant plates are arranged on the inner wall of the ball mill barrel; the ball mill feeding port, the ball mill discharging port and the cylinder screen frame are all formed by integrally compounding stainless steel frameworks and anti-corrosion rubber layers, and the anti-corrosion rubber layers are sprayed on the inner surfaces of the stainless steel frameworks. By comprehensively transforming the feeding mechanism, the ball mill and the drum screen, the durability, the operation stability and the maintenance convenience of equipment in an acid medium environment are remarkably improved, and a set of economical, efficient and stable ball milling system is provided for acid materials.

Description

Technical Field

[0001] The invention relates to the technical field of ball milling, in particular to an acid-resistant ball milling system. Background Art

[0002] Ball mills are widely used for crushing and grinding materials in industries such as mineral processing, building materials, and chemicals. However, traditional ball mills suffer from high energy consumption, rapid liner wear, and poor acid resistance during operation. These issues are particularly prominent when processing ores containing acidic media.

[0003] However, with process optimization, it was discovered that adding extraction liquid to the ball mill during the ball milling stage could allow the acid to take effect, allowing the ore to fully contact the acid while being ground, achieving pre-leaching. This reduces the amount of sulfuric acid used in the subsequent stirring leaching process and effectively reduces the amount of new water entering the production system, thereby alleviating the expansion problem of the tailings pond. Based on these process considerations, the ball mill system must meet the requirements of acid corrosion resistance and wear resistance.

[0004] However, existing carbon steel ball mill systems cannot meet the requirements of acidic environments (pH = 1-2) and are easily corroded by acid. Therefore, this application aims to provide an acid-resistant ball mill system to enhance the acid resistance and wear resistance of the equipment. Summary of the Invention

[0005] The invention provides an acid-resistant ball milling system.

[0006] The specific technical solution of the present invention is: an acid-resistant ball milling system, including a feeding mechanism, a ball mill and a cylindrical screen, the feeding mechanism including a grit feeding device, a belt feeding chute and a buffer feeding bin, the outlets of the grit feeding device and the belt feeding chute are both connected to the silo of the buffer feeding bin, the inner walls of the grit feeding device and the buffer feeding bin are both provided with rubber linings, and the belt feeding chute has a thick bottom and thin side walls; The cylinder and the inner walls of the inlet and outlet covers of the ball mill are provided with three layers of acid-resistant and corrosion-resistant plates; the ball mill feed port, ball mill discharge port and cylindrical screen frame are all integrated with a stainless steel frame and an anti-corrosion rubber layer, and the anti-corrosion rubber layer is sprayed on the inner surface of the stainless steel frame.

[0007] Furthermore, the three-layer acid-resistant and corrosion-resistant plate includes a rubber plate, a protective plate and a rubber lining. The rubber plate is tightly attached to the inner wall of the cylinder and the inlet and outlet end cover, the protective plate is laid on the inner side of the rubber plate, and the rubber lining is laid on the inner side of the protective plate; the protective plate is composited by a stainless steel plate and a vulcanized rubber layer, and the stainless steel plate faces the rubber plate when laid.

[0008] Furthermore, the rubber plate is 3 mm thick and is glued to the inner wall of the ball mill cylinder using acid-resistant glue.

[0009] Furthermore, the guard plate is formed by compounding a 3mm stainless steel plate and a 3mm vulcanized rubber layer.

[0010] Furthermore, the rubber plate is glued to the cylinder and the inner wall of the feed and discharge end cover of the ball mill with acid-resistant glue. The rubber plate, guard plate and rubber lining are also provided with corresponding bolt holes, which can be connected to the cylinder and the inner wall of the feed and discharge end cover of the ball mill by bolts.

[0011] Furthermore, the rubber lining is provided with a raised lifting strip, and the rubber lining and the lifting strip laid on the inner wall of the ball mill cylinder are an integrally formed structure.

[0012] Furthermore, the rubber plate, guard plate and rubber lining laid on the inner wall of the ball mill cylinder are connected to the inner wall of the cylinder through sealing bolts. The sealing bolts include bolts, sealing sleeves, bowl-shaped sealing rings, bowl-shaped washers, and locking nuts. The sealing sleeves are made of acid-resistant rubber material and have outward-extending annular pressure edges at both ends.

[0013] Furthermore, a raised frame is provided on the four edges of the bottom surface of the rubber lining plate laid on the inner wall of the ball mill cylinder, and a raised ring is provided on the outer edge of the bolt hole on the bottom surface, and the height of the raised ring is consistent with that of the raised frame.

[0014] Furthermore, the grit feeding device includes a feeding hopper, and a detachable grit box cover is provided on the top of the feeding hopper.

[0015] Furthermore, the sand settling box cover is connected with a feed pipe, the side wall of the feed hopper is connected with a discharge elbow, the discharge elbow is connected with the buffer feed bin, and the inner walls of the feed pipe and the discharge elbow are lined with acid-resistant and wear-resistant rubber linings.

[0016] Furthermore, the belt feeding chute is composed of a hopper, an upper buffer box, a lower buffer box, several intermediate feeding chutes and a terminal feeding chute connected in sequence; the lower buffer box, several intermediate feeding chutes and the terminal feeding chute are all structures with thick bottoms and thin side walls, and a removable chute cover is provided on the top surface of each intermediate feeding chute.

[0017] Furthermore, the buffer feeding bin includes a silo, and the second rubber lining at the bottom of the silo is concave-convex.

[0018] Furthermore, a detachable cover is provided on the top of the silo.

[0019] Furthermore, the side wall of the silo is connected to a feeding elbow, and the inner wall of the feeding elbow is lined with an acid-resistant and wear-resistant rubber lining.

[0020] Furthermore, the anti-corrosion rubber layers of the ball mill feed port, the ball mill discharge port and the screen frame of the cylindrical screen have been vulcanized.

[0021] Furthermore, a sieve cover is provided outside the sieve frame, the inner wall of the sieve cover is lined with a rubber layer, and a third rubber lining is laid above the rubber layer at the bottom.

[0022] Furthermore, the rubber layer on the inner wall of the screen cover is 6 mm thick.

[0023] Furthermore, the inner wall of the sieve frame is paved with a sieve plate, and the sieve plate is made of acid-resistant and wear-resistant rubber material.

[0024] The beneficial effects of the present invention are as follows: by comprehensively transforming the feeding mechanism, ball mill and cylindrical screen, the present invention enables them to effectively cope with the corrosion of acidic media, significantly improving the durability, operational stability and maintenance convenience of the equipment in an acidic medium environment, and providing an economical, efficient and stable ball milling system for acidic materials. The specific beneficial effects are as follows: (1) Enhanced wear and corrosion resistance of the equipment: By reasonably setting acid-resistant and wear-resistant rubber lining in the feeding mechanism, setting a triple-sealed acid-resistant and corrosion-resistant layer in the ball mill cylinder, the ball mill inlet and outlet and the cylindrical screen frame are made of an integrated composite of a stainless steel skeleton and an anti-corrosion rubber spray layer, and setting acid-resistant and wear-resistant rubber materials in the screen plate and screen cover, the overall wear and corrosion resistance of the ball mill system is enhanced, making it suitable for long-term ball milling and pre-leaching operations in acidic media.

[0025] (2) Improved equipment stability: The buffer feeding bin added to the feeding mechanism can effectively buffer the impact of the front-end feeding device, reduce the direct impact of the material on the ball mill feed port, and reduce equipment wear; the three-layer acid-resistant anti-corrosion layer inside the cylinder is made of acid-resistant rubber material and connected with a sealing sleeve and bolts to ensure the sealing of the connection point and prevent the leakage of acidic media. These designs are conducive to ensuring the reliability and stability of equipment operation.

[0026] (3) Optimized convenience of maintenance and replacement: The design concept of the removable cover and segmented chute in the feeding mechanism greatly facilitates the maintenance and replacement of the equipment, which is conducive to reducing operating and maintenance costs and reducing maintenance time.

[0027] (4) Improved overall work efficiency: The modification of the feeding mechanism can ensure that the acidic material is stably and evenly supplied to the ball mill, thereby improving the ball milling efficiency and product quality; the anti-corrosion rubber spray coating of the ball mill feed port, discharge port and cylindrical screen is integrated, which can improve the overall performance and operating efficiency of the equipment and reduce the downtime caused by equipment failure. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is an overall structural diagram of an acid-resistant ball milling system of the present invention; Figure 2 It is a structural diagram of the grit feeding device; Figure 3It is a longitudinal cross-sectional view of the grit feeding device; Figure 4 It is a structural diagram of the belt feeding chute; Figure 5 It is a longitudinal section of the belt feeding chute; Figure 6 This is a schematic diagram of the structure of the buffer feeding silo; Figure 7 This is a longitudinal cross-sectional view of the buffer feed silo; Figure 8 It is a structural diagram of the ball mill feed port; Figure 9 It is a longitudinal cross-sectional view of the ball mill feed port; Figure 10 It is a structural diagram of the ball mill discharge port; Figure 11 It is a longitudinal cross-sectional view of the ball mill discharge port; Figure 12 It is a longitudinal cross-sectional view of the ball mill cylinder; Figure 13 It is a cross-sectional view of the feed end or discharge end of the ball mill cylinder; Figure 14 This is the front view of the rubber lining; Figure 15 The following is a schematic diagram of the rubber lining structure (the right picture shows the middle rubber lining, and the left picture shows the edge rubber lining); Figure 16 This is the back view of the rubber lining; Figure 17 for Figure 12 Cross-section at point C in the middle; Figure 18 It is a structural diagram of the sealing bolt; Figure 19 for Figure 13 Cross-sectional view of the connection structure of the lifting strip and three-layer acid-resistant and corrosion-resistant plate; Figure 20 It is a structural diagram of a cylindrical screen; Figure 21 It is a transverse cross-sectional view of the cylindrical screen and the screen cover; Figure 22 It is the right view of the screen cover; Figure 23 for Figure 22 DD profile; Figure 24 for Figure 22 EE profile diagram; In the picture: 1-sand feeding device 1, 11-feeding hopper, 12-sand box cover, 13-feed pipe, 14-discharge elbow, 15-first rubber lining; 2-belt feeding chute, 21-hopper, 22-upper buffer box, 23-lower buffer box, 24-head feeding chute, 25-middle feeding chute, 251-chute cover, 26-end feeding chute; 3- buffer feeding bin, 31- silo, 311- removable cover, 32- feeding elbow, 33- second rubber lining; 5- ball mill feed port, 51- stainless steel frame, 52- anti-corrosion rubber layer; 6-ball mill, 61-rubber plate, 62-guard plate, 63-rubber lining, 631-raised frame, 632-bolt hole, 633-raised ring, 64-lifting bar, 65-sealing bolt, 651-bolt, 652-sealing sleeve, 653-bowl-shaped sealing ring, 654-bowl-shaped washer, 655-locking nut, 66-T-bolt; 7-ball mill discharge port; 8-cylinder screen, 81-screen frame, 82-screen plate, 83-guide plate; 9-screen cover, 91-rubber layer, 92-third rubber lining. DETAILED DESCRIPTION

[0029] In order to make the technical problems and technical solutions solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0030] like Figure 1 As shown, this embodiment provides an acid-resistant ball milling system, comprising a feeding mechanism, a ball mill 6, and a cylindrical screen 8. The feeding mechanism is connected to the ball mill feed port 5, and the cylindrical screen 8 is connected to the ball mill discharge port 7. By comprehensively modifying the feeding mechanism, ball mill 6, and cylindrical screen 8, the system can effectively resist corrosion from acidic media, thereby significantly improving the durability and maintenance ease of the equipment, providing a complete ball milling system for acidic materials.

[0031] The feeding mechanism includes a grit feeding device 1, a belt feeding chute 2, and a buffer feeding bin 3. The outlets of the grit feeding device 1 and the belt feeding chute 2 are both connected to the silo of the buffer feeding bin 3, and the outlet of the buffer feeding bin 3 is connected to the ball mill feed inlet 5. The feeding mechanism provided in this embodiment, on the one hand, improves the traditional grit feeding device 1 and the belt feeding chute 2 to provide a stable and uniform supply of acidic material to the ball mill. On the other hand, by adding the buffer feeding bin 3 between the grit feeding device 1 and the belt feeding chute 2 and the ball mill feed inlet 5, the feeding of the two front feeding devices is effectively buffered, reducing the impact of material directly fed into the ball mill feed inlet 5.

[0032] like Figure 2 Figure 3As shown, the grit feeding device 1 includes a feeding hopper 11, and a grit box cover 12 is provided on the top of the feeding hopper 11. The grit box cover 12 is connected to the top of the feeding hopper 11 by bolts, which is convenient for disassembly and maintenance. A feed pipe 13 is connected to the grit box cover 12, and a discharge elbow 14 is connected to the side wall of the feeding hopper 11. The discharge elbow 14 is connected to the buffer feeding bin 3. A first rubber lining 15 is provided on the inner wall of the feeding hopper 11, and the first rubber lining 15 is connected to the feeding hopper 11 by bolts, which is convenient for disassembly and replacement; the inner walls of the feed pipe 13 and the discharge elbow 14 are lined with acid-resistant and wear-resistant rubber linings. The grit feeding device 1 provided in this embodiment transforms the traditional integrated feeding hopper into a detachable grit box cover 12, which is convenient for replacement and maintenance of the first rubber lining 15 inside the feeding hopper 11. At the same time, the first rubber lining 15 and the acid-resistant and wear-resistant rubber lining can respectively protect the feeding hopper 11, the feeding pipe 13 and the discharging elbow 14 to prevent corrosion by acidic media.

[0033] like Figure 4 Figure 5 As shown, the belt feeding chute 2 is composed of a hopper 21, an upper buffer box 22, a lower buffer box 23, several intermediate feeding chutes 24, and a terminal feeding chute 25, which are connected in sequence. The specific number of the intermediate feeding chutes 24 is flexibly configured according to the feeding distance. After being connected, several intermediate feeding chutes 25 are arranged between the lower buffer box 23 and the terminal feeding chute 25, and the terminal feeding chute 25 is connected to the silo of the buffer feeding bin 3. The lower buffer box 23, the intermediate feeding chute 24, and the terminal feeding chute 25 all have a thick bottom wall and thin side walls. A removable chute cover 241 is provided on the top surface of each intermediate feeding chute 24 and is connected by bolts. Compared with the traditional structure of a feeding hopper plus a conveying pipe (generally a plastic pipe or an iron pipe), the belt feeding chute 2 provided in this embodiment first adds two buffer boxes under the feeding hopper to perform preliminary buffering of the material; secondly, a segmented chute design is adopted, which is conducive to subsequent segmented maintenance and replacement, reducing material costs; finally, the chute cover plate 241 design on the top of the intermediate feeding chute 24 facilitates the dredging and cleaning of the chute, solving the common problem of pipeline blockage.

[0034] like Figure 6 Figure 7 As shown, the buffer feed silo 3 includes a silo 31 and a feed elbow 32 connected to its outlet. The top of the silo 31 is designed with a removable cover 311. The inner wall of the silo 31 is equipped with a second rubber lining 33. The second rubber lining 33 at the bottom has a concave-convex shape to enhance wear resistance and cushioning effect. The inner wall of the feed elbow 32 is lined with an acid-resistant and wear-resistant rubber lining. The second rubber lining 15 and the acid-resistant and wear-resistant rubber lining respectively protect the buffer feed silo 3 and the feed elbow 32 from corrosion by acidic media.

[0035] like Figures 8 to 11As shown, the ball mill feed port 5 and the ball mill discharge port 7 are formed by integrating a stainless steel skeleton 51 and an anti-corrosion rubber layer 52, and the anti-corrosion rubber layer 52 is sprayed on the inner surface of the stainless steel skeleton. During production, the skeleton of the ball mill feed port 5 and the ball mill discharge port 7 is first welded with stainless steel, and then the anti-corrosion rubber layer is sprayed on the inner surface of the skeleton. After spraying, the uncured anti-corrosion rubber layer (raw rubber) is vulcanized in a vulcanizer to convert the unvulcanized anti-corrosion rubber layer (raw rubber) into a cooked rubber with physical and mechanical properties and chemical stability, thereby improving the quality and acid and wear resistance of the ball mill feed port 5 and the discharge port 7. This embodiment uses a stainless steel skeleton plus an anti-corrosion rubber spray layer to integrate the feed port 5 and the discharge port 7. Compared with the traditional rubber-lined feed port and discharge port structure, its performance and quality are better, and it has better corrosion resistance and abrasion resistance.

[0036] like Figures 12 to 18 As shown, the cylinder body and the inner wall of the inlet and outlet end cover of the ball mill 6 are provided with three layers of acid-resistant anti-corrosion plates; the three layers of acid-resistant anti-corrosion plates include a rubber plate 61, a guard plate 62 and a rubber lining plate 63. The rubber plate 61 is closely attached to the cylinder body and the inner wall of the inlet and outlet end cover, the guard plate 62 is laid on the inner side of the rubber plate 61, and the rubber lining plate 63 is laid on the inner side of the guard plate 62. In this way, the cylinder body is laid from the outside to the inside to form a triple acid-resistant anti-corrosion protection, so that the ball mill can well adapt to the ball milling and pre-leaching of acidic materials. Among them, the rubber plate 61 is 6 mm thick and is glued to the inner wall with acid-resistant glue; after the rubber plate 61 is glued, a protective plate 62 is laid on its inner side. The protective plate 62 is 6 mm thick and has the same length and width as the rubber plate 61. The protective plate 62 is composed of a 3 mm stainless steel plate and a 3 mm vulcanized rubber layer. When laying, the stainless steel plate faces the rubber plate 61; after the protective plate 62 is laid, the rubber lining 63 is continued to be laid on its inner side.

[0037] like Figure 17 As shown, corresponding bolt holes are provided on the rubber plate 61, the guard plate 62 and the rubber lining plate 63 for the bolts to pass through. During the laying process, the bolts can be used to pass through the rubber lining plate 63, the guard plate 62, the rubber plate 61 and the cylinder or the feed and discharge end cover from the inside to the outside, and finally the three-layer acid-resistant and corrosion-resistant plate is locked and fixed on the cylinder or the feed and discharge end cover.

[0038] like Figure 12 Figure 13 As shown, a raised lifting strip 64 is provided on the top surface of the rubber lining 63 .

[0039] like Figures 14 to 15 As shown, the rubber lining 63 and the lifting bar 64 laid inside the cylinder of the ball mill 6 are an integrally formed structure.

[0040] like Figure 16As shown, the rubber lining 63 installed inside the cylinder of the ball mill 6 has a raised frame 631 around its bottom edge. Two bolt holes 632 are located on the side away from the lifting bar 64. A raised ring 633 is located on the outer edge of the bolt holes 632 on the same side as the raised frame 631, and the raised ring 633 is at the same height as the raised frame 631. The arrangement of the raised frame 631 and the raised ring 633 creates a large groove structure on the bottom surface of the rubber lining 63. This groove structure provides a certain amount of compression space between the rubber lining 63 and the guard plate 62 when the rubber lining 63 is connected. This ensures that the inner surface of all rubber liners 63 remain substantially flat after installation, thereby ensuring a tight seal.

[0041] like Figure 17 Figure 18 As shown, the rubber sheet 61, guard plate 62, and rubber lining 63, installed on the inner wall of the ball mill 6 cylinder, are connected to the inner wall of the cylinder via sealing bolts 65. The sealing bolts 65 comprise a bolt 651, a sealing sleeve 652, a bowl-shaped sealing ring 653, a bowl-shaped washer 654, and a lock nut 655. The sealing sleeve 652 is made of acid-resistant rubber and has an outward-extending annular pressure flanges at both ends. To connect the cylinder using the sealing bolts 65, the sealing sleeve 652 is first passed from the inside of the cylinder through the rubber lining 63, guard plate 62, rubber sheet 61, and cylinder. The annular pressure flanges at both ends of the sealing sleeve 652 are then aligned with the inner side of the rubber lining 63 and the outer side of the cylinder, respectively. The bolts 651 are then inserted into the sealing sleeve 652. After the bottom end of the bolts 651 protrudes from the cylinder, the bowl-shaped sealing ring 653 and bowl-shaped washer 654 are placed on top of the bolts, and the lock nut 655 is screwed in to secure the bolts. The provision of the sealing sleeve 652 can well ensure the sealing of the bolt connection point, ensuring that no leakage occurs at the connection point.

[0042] like Figure 19As shown, the rubber lining 63 and lifting bar 64 installed inside the inlet and outlet end covers of the ball mill 6 are separate structures. The rubber sheet 61, protective plate 62, and rubber lining 63 are connected to the end covers via T-bolts 66. The bottom of the lifting bar 64 on the inlet and outlet end covers has a through slot 67 for the T-bolt 66 to pass through. The T-bolt 66 comprises a bolt 651, a sealing sleeve 652, a bowl-shaped sealing ring 653, a bowl-shaped washer 654, and a locking nut 655. The sealing sleeve 652 is made of acid-resistant rubber and has outward-extending annular pressure flanges at both ends. When using the T-bolt 66 for connection, first pass the sealing sleeve 652 from the inside of the end cover through the rubber lining 63, the protective plate 62, the rubber plate 61 and the end cover in sequence. At this time, the annular pressure edges at both ends of the sealing sleeve 652 can fit the inner side of the rubber lining 63 and the outer side of the end cover respectively; then insert the bolt 651 into the sealing sleeve 652, and after the bottom end of the bolt 651 extends out of the cylinder, put on the bowl-shaped sealing ring 653 and the bowl-shaped gasket 654 in sequence, and then screw in the locking nut 655 to lock it.

[0043] like Figure 20 Figure 21 As shown, the cylindrical screen 8 includes a screen frame 81, a screen plate 82, and a guide plate 83. The screen plate 82 is mounted on the inner wall of the screen frame 81 by bolts, and the guide plate 83 is mounted on the inner side of the screen plate 82 by fixing bolts. The screen frame 81 is made of an integrated composite of a stainless steel skeleton and an anti-corrosion rubber layer, and the anti-corrosion rubber layer is sprayed on the inner surface of the stainless steel skeleton. During production, the skeleton of the screen frame is first welded out using stainless steel, and then the anti-corrosion rubber layer is sprayed on the inner surface of the skeleton. After spraying, it is vulcanized in a vulcanizer to convert the unvulcanized anti-corrosion rubber layer (raw rubber) into cooked rubber with physical and mechanical properties and chemical stability, forming an integrated rubber screen frame, which can greatly improve the quality and acid and wear resistance of the cylindrical screen. The screen plate 82 is made of acid-resistant and wear-resistant rubber material.

[0044] like Figures 21 to 23 As shown, a sieve cover 9 is also provided on the outside of the sieve frame 81. The inner wall of the sieve cover 9 is lined with a 6 mm thick rubber layer 91, and a third rubber lining 92 is laid on the bottom above the rubber layer 91. Specifically, the third rubber lining 92 is connected to the inner wall of the bottom of the sieve cover 9 by bolts to further enhance wear resistance and corrosion resistance.

[0045] The ball mill system in this embodiment significantly improves the service life and operational stability of the entire ball mill in acidic environments through its innovative feeding mechanism design, triple-sealed acid-resistant anti-corrosion coating on the cylinder, integrated steel structure and anti-corrosion rubber composite design of key components, and the use of acid-resistant and wear-resistant materials. This provides a scientific and effective solution for the milling and pre-leaching of acidic materials. Furthermore, its detachable and segmented design greatly facilitates equipment maintenance and replacement, reducing operating costs.

[0046] The present invention is described in detail above through specific and preferred embodiments, but those skilled in the art should understand that the present invention is not limited to the embodiments described above. Any modifications, equivalent substitutions, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An acid-resistant ball milling system comprising a feeding mechanism, a ball mill (6) and a cylindrical screen (8), characterized in that: The feeding mechanism comprises a grit feeding device (1), a belt feeding chute (2) and a buffer feeding bin (3); the outlets of the grit feeding device (1) and the belt feeding chute (2) are both connected to the silo of the buffer feeding bin (3); the inner walls of the grit feeding device (1) and the buffer feeding bin (3) are both provided with rubber linings; the chute of the belt feeding chute (2) is a structure with a thick bottom and thin side walls; The cylinder and the inner wall of the inlet and outlet end covers of the ball mill (6) are provided with three layers of acid-resistant anti-corrosion plates; the ball mill feed port (5), the ball mill discharge port (7) and the screen frame (81) of the cylindrical screen are all formed by integrating a stainless steel skeleton and an anti-corrosion rubber layer, and the anti-corrosion rubber layer is sprayed on the inner surface of the stainless steel skeleton.

2. The acid-resistant ball milling system according to claim 1, characterized in that: The three-layer acid-resistant and corrosion-resistant plate includes a rubber plate (61), a protective plate (62) and a rubber lining plate (63). The rubber plate (61) is closely attached to the inner wall of the cylinder and the inlet and outlet end cover. The protective plate (62) is laid on the inner side of the rubber plate (61). The rubber lining plate (63) is laid on the inner side of the protective plate (62). The protective plate (62) is composed of a stainless steel plate and a vulcanized rubber layer, and when laid, the stainless steel plate surface faces the rubber plate (61).

3. The acid-resistant ball milling system according to claim 2, characterized in that: The rubber plate (61) is adhered to the cylinder and the inner wall of the feed and discharge end cover of the ball mill (6) using acid-resistant glue. The rubber plate (61), the guard plate (62) and the rubber lining plate (63) are also provided with corresponding bolt holes, which can be connected to the cylinder and the inner wall of the feed and discharge end cover of the ball mill (6) by bolts.

4. An acid-resistant ball milling system according to any one of claims 2-3, characterized in that: A raised lifting strip (64) is provided on the rubber lining (63), and the rubber lining (63) and the lifting strip (64) laid on the inner wall of the cylinder of the ball mill (6) are an integrally formed structure.

5. The acid-resistant ball milling system according to claim 4, characterized in that: The rubber plate (61), the guard plate (62) and the rubber lining (63) laid on the inner wall of the cylinder of the ball mill (6) are connected to the inner wall of the cylinder via a sealing bolt (65). The sealing bolt (65) comprises a bolt (651), a sealing sleeve (652), a bowl-shaped sealing ring (653), a bowl-shaped gasket (654) and a locking nut (655). The sealing sleeve (652) is made of an acid-resistant rubber material and has an annular pressure edge extending outward at both ends.

6. The acid-resistant ball milling system according to claim 5, characterized in that: The bottom surface of the rubber lining (63) laid on the inner wall of the cylinder of the ball mill (6) is provided with a raised frame (631) on four edges thereof, and the outer edge of the bolt hole (632) on the bottom surface is provided with a raised ring (633), and the raised ring (633) is at the same height as the raised frame (631).

7. An acid-resistant ball milling system according to any one of claims 1 to 3 or 5 to 6, characterized in that: The grit feeding device (1) comprises a feeding hopper (11), and a detachable grit box cover (12) is provided on the top of the feeding hopper (11).

8. The acid-resistant ball milling system according to claim 1, characterized in that: The belt feeding chute (2) is composed of a hopper (21), an upper buffer box (22), a lower buffer box (23), a plurality of intermediate feeding chutes (24) and a terminal feeding chute (25) connected in sequence; the lower buffer box (23), the plurality of intermediate feeding chutes (24) and the terminal feeding chute (25) are all structures with thick bottom walls and thin side walls, and a detachable chute cover (241) is provided on the top surface of each intermediate feeding chute (24).

9. An acid-resistant ball milling system according to claim 1 or 8, characterized in that: The buffer feed bin (3) comprises a bin (31), a detachable cover plate (311) is provided on the top of the bin (31), and a second rubber lining plate (33) at the bottom of the bin (31) is concave-convex.

10. The acid-resistant ball milling system according to claim 1, characterized in that: A sieve cover (9) is further provided on the outside of the sieve frame (81), the inner wall of the sieve cover (9) is lined with a rubber layer (91), and a third rubber lining (92) is laid above the rubber layer (91) at the bottom thereof.

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