A composite liner plate for semi-autogenous and ball mills

Abstract

The utility model relates to a kind of composite lining for semi-autogenous mill and ball mill, including first lining body, second lining body and metal ceramic block, first lining body includes boss and transition zone;First lining body is used for semi-autogenous mill;Second lining body includes boss, transition zone and bottom plate, bottom plate is between two bosses;Second lining body is used for ball mill;Metal ceramic block is evenly distributed in the working surface of first lining body and second lining body;Metal ceramic block is provided with through hole, and metal liquid of boss, transition zone and bottom plate is fused into an organic whole with metal ceramic block by through hole.The utility model hole makes metal liquid infiltrate into the inside of metal ceramic block when casting, forms "metal anchor nail" structure after cooling and solidification, provides pullout resistance perpendicular to interface for metal ceramic block, effectively prevents metal ceramic block from transverse slip or drop under impact load.

Description

Technical Field

[0001] This utility model relates to the field of mining machinery and equipment technology, specifically to a composite liner for semi-autogenous grinding mills and ball mills. Background Technology

[0002] In the complex and harsh working environment of semi-autogenous mills and ball mills, liners perform multiple critical functions. On the one hand, they resist the impact and friction of ore. During operation, the ore continuously impacts and scrapes the liner surface. Through its wear-resistant properties, the liner protects the main structure of the equipment from wear and damage, extending the equipment's service life. On the other hand, liners optimize material crushing. Their special shape and structural design guide the ore to form a reasonable movement trajectory within the equipment, enhancing crushing and grinding efficiency and ensuring uniform particle size of the output material. However, the hardness, particle size, and abrasiveness of ores vary significantly. When high-hardness ores continuously impact the liner surface, it can cause fatigue spalling of the surface material, groove wear, and even cracks. The moisture content or sticky substances in the ore may exacerbate adhesive wear between the liner and the ore, leading to thinning of the liner thickness and a decrease in structural strength over long-term operation.

[0003] Authorization Announcement No.: CN212576439 U, Application Date: 2020.06.28, Utility Model Name: A Novel Wear-Resistant Liner for Semi-Autogenous Grinding Mills. This utility model discloses a novel wear-resistant liner for semi-autogenous grinding mills, comprising a body, the body including a base plate and a lifting boss perpendicularly connected to the base plate. The lower left end of the base plate forms a lower convex plate extending to the left, and the upper right end of the base plate forms an upper concave plate extending to the right. The upper concave plate adjacent to the base plate is connected to the lower convex plate. The upper part of the lower convex plate is provided with a mating groove, and the lower part of the upper concave plate is provided with a mating protrusion matching the mating groove. The mating protrusion is engaged in the mating groove. The inner side of the base plate is provided with a side-serrated wear-resistant ridge. Both sides of the lifting boss are wavy surfaces. The lifting boss is provided with mounting holes, and both sides of the lifting boss are connected to lifting plates. This utility model discloses a novel wear-resistant semi-autogenous grinding mill liner with the above-mentioned structure, which has strong wear resistance. The overlapping connection between the liners avoids gaps and extends their service life.

[0004] The aforementioned prior art features serrated wear-resistant ridges on the inner side of the base plate, designed to enhance the impact resistance and wear resistance of the liner base plate. However, this design has drawbacks. On the one hand, under high-speed impact and continuous scraping, the tip of the ridge bears the brunt of the enormous impact force, making it prone to plastic deformation and fracture, causing the ridge to be worn flat in a short time. On the other hand, the serrated structure easily causes ore particles to embed into the grooves, forming a "wedge effect," thus losing the function of enhancing the wear resistance of the base plate and failing to meet the requirements for long-term stable operation of a semi-autogenous mill. Utility Model Content

[0005] In view of the shortcomings of the existing technology, such as short service life of the protruding ridges and loss of the function of enhancing the wear resistance of the liner, the purpose of this utility model is to provide a composite liner for semi-autogenous mills and ball mills that enhances the wear resistance of the liner body.

[0006] The technical solution provided by this utility model is as follows:

[0007] A composite liner for semi-autogenous mills and ball mills, comprising,

[0008] A first liner body, the first liner body including a boss and a transition zone; the first liner body is used in a semi-autogenous grinding mill;

[0009] The second liner body includes a boss, a transition zone, and a base plate, with the base plate located between the two bosses; the second liner body is used in a ball mill.

[0010] Among them, the thickness of the boss is greater than the thickness of the transition zone or the base plate;

[0011] It also includes metal-ceramic blocks; among which,

[0012] The metal-ceramic blocks are evenly distributed on the working surfaces of the first liner body and the second liner body.

[0013] The metal-ceramic block is provided with through holes, and the molten metal of the boss, transition zone and base plate is fused together with the metal-ceramic block through the through holes.

[0014] Furthermore, each of the metal-ceramic blocks has at least two through holes, and the through holes are circular or square.

[0015] Furthermore, the metal-ceramic block includes single-row metal-ceramic blocks and multi-row metal-ceramic blocks;

[0016] The through holes of the single-row metal-ceramic block are arranged in a straight line, while the through holes of the multi-row metal-ceramic block are arranged in an array.

[0017] Furthermore, the working surface of the first liner body is cast with metal-ceramic blocks and / or multiple rows of metal-ceramic blocks; the working surface of the second liner body is cast with metal-ceramic blocks and / or multiple rows of metal-ceramic blocks.

[0018] Furthermore, when the through hole is circular, its diameter is A, and A ranges from 18mm to 23mm; the net distance between adjacent through holes is C, and A / 2≤C≤A;

[0019] When the through hole is square, its side length is B, and B ranges from 20mm to 25mm; the net distance between adjacent through holes is D, and B / 2≤D≤B.

[0020] Furthermore, the metal-ceramic blocks are arranged with gaps, and the net distance between two adjacent metal-ceramic blocks is not less than 12mm.

[0021] Furthermore, along the length direction of the boss, at least one row of metal-ceramic blocks is fused and cast onto the working surface of the boss;

[0022] Along the width direction of the boss, there is a gap between the edge of the boss and the edge of the metal-ceramic block.

[0023] Furthermore, the thickness of the metal-ceramic block on the boss is not less than the thickness of the metal-ceramic block on the transition zone and the base plate.

[0024] Furthermore, the transition zone comprises a plane, an arcuate surface, and a buffer surface connected in sequence;

[0025] The boss is located on the side of the buffer surface away from the curved surface;

[0026] The thickness of the transition zone gradually increases from the plane to the buffer surface.

[0027] Furthermore, along the length extension direction of the transition zone, the planar surface and the buffer surface are uniformly cast with metal-ceramic blocks, while the arc-shaped surface is not cast with metal-ceramic blocks.

[0028] Furthermore, along the direction from the plane to the buffer surface, the metal-ceramic block sequentially crosses the plane, the arc-shaped surface, and the buffer surface.

[0029] Compared with the prior art, the technical solution provided by this utility model has the following advantages:

[0030] (1) This utility model provides a through hole inside the metal-ceramic block, allowing molten metal to seep into the block during casting. After cooling and solidification, it forms a "metal anchor" structure, providing the metal-ceramic block with a pull-out force perpendicular to the interface, effectively preventing the metal-ceramic block from sliding laterally or falling off under impact loads. When dealing with high impact conditions during ore crushing, it ensures that the metal-ceramic block consistently exhibits its high hardness and high wear resistance, maintaining the wear resistance of the liner surface, effectively reducing equipment maintenance frequency and lowering operating costs.

[0031] (2) The metal ceramic block of this utility model has no less than two through holes; on the one hand, multiple through holes significantly increase the contact and bonding area between the molten metal and the metal ceramic block, further strengthening the metallurgical bond between the two, making the structure of the composite liner at the micro level more compact and stable, and improving the overall mechanical properties; on the other hand, the diverse through hole arrangement methods give rise to single-row metal ceramic blocks and multi-row metal ceramic blocks, allowing users to flexibly select the appropriate type of metal ceramic block according to different ore characteristics, working parameters of grinding and crushing equipment, and other actual working conditions. Attached Figure Description

[0032] Figure 1 This is an overall structural diagram of the first liner body in one embodiment of this application;

[0033] Figure 2 This is a schematic diagram of a transition zone simultaneously casting single-row and multi-row metal-ceramic blocks in one embodiment of this application;

[0034] Figure 3 This is a schematic diagram of a single-row metal-ceramic block with a transition zone casting in one embodiment of this application;

[0035] Figure 4 This is an overall structural diagram of the second liner body in one embodiment of this application;

[0036] Figure 5 This is a schematic diagram of a multi-row metal-ceramic block with a transition zone in one embodiment of this application;

[0037] Figure 6 This is a three-dimensional structural diagram of a single-row metal-ceramic block with circular through holes in one embodiment of this application;

[0038] Figure 7 This is a front view of a single-row metal-ceramic block with circular through holes in one embodiment of this application;

[0039] Figure 8 This is a three-dimensional structural diagram of a single-row metal-ceramic block with square through holes in one embodiment of this application;

[0040] Figure 9 This is a front view of a single-row metal-ceramic block with square through holes in one embodiment of this application;

[0041] Figure 10 This is a three-dimensional structural diagram of a multi-row metal-ceramic block with circular through holes in one embodiment of this application;

[0042] Figure 11 This is a front view of a multi-row metal-ceramic block with circular through holes in one embodiment of this application;

[0043] Figure 12 This is a front view of a multi-row metal-ceramic block with hexagonal through holes in one embodiment of this application.

[0044] Explanation of the labels in the diagram:

[0045] 11. Boss; 12. Transition zone; 121. Plane; 122. Curved surface; 123. Buffer surface; 13. Base plate;

[0046] Metal-ceramic block 2, single-row metal-ceramic block 21, multi-row metal-ceramic block 22. Detailed Implementation

[0047] To further understand the content of this utility model, a detailed description of this utility model will be provided in conjunction with the accompanying drawings and embodiments.

[0048] The structures, proportions, and sizes illustrated in the accompanying drawings are merely for illustrative purposes and to aid those skilled in the art in understanding and reading the invention. They are not intended to limit the scope of the invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of the invention, should still fall within the scope of the technical content disclosed in this utility model. Furthermore, terms such as "upper," "lower," "left," "right," and "middle" used in this specification are merely for clarity and not intended to limit the scope of implementation. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention's implementation.

[0049] A semi-autogenous grinding mill mainly consists of a cylinder, end covers, a hollow shaft, a transmission device, liners, grate plates, and grinding media (steel balls). The liners are the core component, used to resist the impact of materials and steel balls; the end covers are connected to the hollow shaft for material inlet and outlet; the transmission device drives the cylinder to rotate; the grate plates are located at the discharge end, controlling material discharge and circulation; and the steel balls, as auxiliary grinding media, typically occupy 8% to 15% of the cylinder volume.

[0050] The material to be ground enters the cylinder through the feed inlet and the hollow shaft. This material can be pre-crushed ore, which directly enters the semi-autogenous mill for further grinding.

[0051] The transmission device drives the cylinder to rotate, and the material and steel balls inside the cylinder rise with the cylinder under the action of centrifugal force and friction. As the cylinder rotates, the material and steel balls are gradually lifted to a certain height, at which point the material and steel balls are in a circular motion state inside the cylinder.

[0052] Once the material and steel balls are lifted to a critical angle, they begin to fall due to gravity. During this descent, large pieces of material collide with the steel balls and the liner, generating a powerful impact that initially breaks the material apart. Smaller pieces are further ground and pulverized through the squeezing and friction between the steel balls and the liner, and between the steel balls themselves. Simultaneously, some harder materials collide and rub against each other, achieving self-grinding and reducing reliance on the steel balls.

[0053] A ball mill is mainly composed of five parts: cylinder, end cover, hollow shaft, transmission device, liner and grinding media. The grinding media are usually steel balls, steel segments or ceramic balls, accounting for 30% to 50% of the cylinder volume, and are the key medium for material crushing.

[0054] Ball mills primarily rely on the impact and grinding action of grinding media such as steel balls and steel segments to pulverize materials. The rotating cylinder lifts the media to a certain height before it falls, using kinetic energy to crush the material (impact crushing). Simultaneously, the compression and friction between the media achieve surface grinding of the material (grinding and pulverizing). Semi-autogenous mills, on the other hand, utilize the material itself and a small amount of steel balls as grinding media. The material collides and rubs against each other within the cylinder to achieve autogenous grinding, while the steel balls assist in enhancing the crushing effect, especially supplementing the crushing of material particle sizes that are difficult to handle with autogenous grinding.

[0055] In addition, ball mills can produce finer-sized products by adjusting parameters such as steel ball gradation and cylinder rotation speed. They are often used in applications with high particle size requirements, such as the preparation of fine mineral powders and the grinding of paint pigments. Semi-autogenous mills produce relatively coarser particles and are often used as coarse grinding equipment in the grinding process to provide materials of suitable particle size for subsequent fine grinding processes.

[0056] This application discloses a composite liner, comprising a first liner body for a semi-autogenous grinding mill, a second liner body for a ball mill, and a cermet block 2. The first liner body includes bosses 11 and a transition zone 12. The second liner body includes bosses 11, the transition zone 12, and a base plate 13 located between the two bosses. In both the first and second liner bodies, the thickness of the bosses 11 is greater than the thickness of the transition zone 12 or the base plate 13.

[0057] Metal-ceramic blocks 2 are evenly arranged on the working surfaces of the first liner body and the second liner body. The net distance between two adjacent metal-ceramic blocks 2 is not less than 12mm. The net distance mentioned here refers to the vertical distance between the edge of a metal-ceramic block 2 and the edge of the adjacent metal-ceramic block 2.

[0058] The cermet block 2 has through holes, through which the molten metal of the boss 11, transition zone 12, and base plate 13 is fused together with the cermet block 2. Simultaneously, the cermet block 2 is located on the working surfaces of the first and second liner bodies and does not protrude from them. Therefore, a unique wear protection mechanism is formed, avoiding stress concentration caused by the cermet block 2 protruding from the working surfaces. Stress concentration can easily lead to cracks at the joint between the cermet block 2 and the first and second liner bodies, causing the cermet block 2 to loosen or even fall off.

[0059] The composite liner of this application is designed with the metal-ceramic block 2 flush with the working surface, which allows stress to be evenly distributed along the working surface, ensuring the structural stability of the composite liner under long-term high-load working environment.

[0060] Another approach is to place the surface of the metal-ceramic block 2 slightly below the working surface by 0.5 to 3 mm, which can form a unique wear protection mechanism. After the working surface is worn to a certain extent, the metal-ceramic block 2 is gradually exposed and bears the main wear load (similar to the "gradient wear" mechanism), forming a natural "hard support layer".

[0061] To ensure the structural strength of the cermet block 2, for a single cermet block 2, the net distance from the edge of the through hole to the edge of the cermet block 2 is E, where E ≥ 10 mm, forming an annular protective layer with a width of not less than 10 mm. To ensure the bonding stability between the cermet block 2 and the first and second liner bodies, the cermet block 2 preferably adopts a porous structure with at least two through holes. This structure can significantly increase the contact area with the molten metal of the liner body 1, enhancing the interfacial metallurgical bonding effect.

[0062] Each metal-ceramic block 2 has at least two through holes. When the through hole is circular, the diameter A ranges from 18mm to 23mm, and the net distance between adjacent through holes is C, where A / 2 ≤ C ≤ A. When the through hole is square, the side length B ranges from 20mm to 25mm, and the net distance between adjacent through holes is D, where B / 2 ≤ D ≤ B. It is worth noting that the net distance mentioned here refers to the vertical distance between the edges of adjacent through holes.

[0063] In addition, through holes can also be regular polygons other than squares, such as regular hexagons. In this case, the diameter of the circumscribed circle of the through hole is 20mm to 25mm, and the net distance between adjacent through holes is not less than the radius of the circumscribed circle of the through hole and not greater than the diameter of the circumscribed circle of the through hole.

[0064] The diameter of the through hole is required to ensure that the molten metal of the first liner body and the second liner body is fully filled in the through hole, forming a uniformly distributed "metal anchor" reinforcement structure, which enhances the mechanical interlocking performance between the metal ceramic block 2 and the first liner body and the second liner body, and ultimately improves the overall wear resistance and impact resistance of the composite liner.

[0065] More specifically, along the length of the boss 11, at least one row of metal-ceramic blocks 2 is cast and fused onto its working surface; along the width of the boss 11, there is a gap between the edge of the boss 11 and the edge of the metal-ceramic block 2, and the net distance between the two is not less than 12 mm, preferably ranging from 12 mm to 18 mm. It is worth noting that the net distance between the edges mentioned here refers to the vertical distance between the edge of the boss 11 and the boundary of the nearest metal-ceramic block 2.

[0066] By controlling the edge clearance, the molten metal can be fully fused with the metal-ceramic block 2, thereby improving the bonding strength between the two and effectively preventing the metal-ceramic block 2 from falling off during mill operation. Stable fusion bonding allows the high hardness and high wear resistance of the metal-ceramic block 2 to be better utilized, working synergistically with the liner substrate to improve the wear resistance and impact resistance of semi-autogenous mills and ball mills during grinding operations.

[0067] The transition zone 12 includes a plane 121, an arc-shaped surface 122, and a buffer surface 123 connected in sequence. The boss 11 is located on the side of the buffer surface 123 away from the arc-shaped surface. The thickness of the transition zone 12 gradually increases from the plane 121 to the buffer surface 123. The arc-shaped surface ensures a smooth transition when materials move on the surface of the composite liner, reducing movement resistance and wear. By rationally designing the curvature, the movement trajectory of materials within the mill can be optimized, improving grinding efficiency.

[0068] When the radius of curvature or arc length of the arc surface 122 is small, the metal-ceramic block 2 is not placed in this area, but the metal-ceramic block 2 is uniformly cast on the plane 121 and buffer surface 123. This is mainly based on considerations of both casting process and grinding function. From the perspective of casting process, a smaller radius of curvature or a shorter arc length will result in limited flow space for the molten metal during casting, leading to poor fluidity. This can cause the molten metal to fail to fully fill the through holes and surrounding gaps of the metal-ceramic block 2, thereby reducing the casting effect between the molten metal and the metal-ceramic block 2 and affecting their bonding strength. From the perspective of grinding function, in the actual operation of semi-autogenous mills and ball mills, due to the relatively large diameter of the steel balls, the arc surface 122 participates less in direct grinding during the material grinding and crushing process, and the requirements for wear resistance are relatively low. Therefore, even if the metal-ceramic block is not placed on the arc surface 122, it will not have a significant impact on the overall grinding and crushing function of the composite liner, and can also avoid quality problems caused by poor casting effect.

[0069] When the radius of curvature or arc length of the arc surface 122 is large, meaning that the arc surface 122 participates to a large extent in the grinding and crushing of materials, the metal-ceramic block 2 adopts a cross-regional casting layout along the direction from the plane 121 to the buffer surface 123, successively spanning the plane 121, the arc surface 122, and the buffer surface 123. This design allows the metal-ceramic block 2, with its high hardness and high wear resistance, to effectively resist the impact and friction between the steel ball and the material when the arc surface 122 participates in the grinding of materials, significantly reducing the wear rate of the arc surface 122. At the same time, the continuous layout of the metal-ceramic block 2 helps to evenly transmit stress between the plane 121, the arc surface 122, and the buffer surface 123, avoiding local damage caused by stress concentration on the arc surface 122, thereby improving the overall service life and working stability of the composite liner under complex grinding conditions.

[0070] The metal-ceramic blocks 2 are classified according to the type of through holes, including single-row metal-ceramic blocks 21 and multi-row metal-ceramic blocks 22. Among them, the through holes of the single-row metal-ceramic blocks 21 are arranged in a straight line, while the through holes of the multi-row metal-ceramic blocks 22 are arranged in an array.

[0071] Depending on the actual working conditions of the semi-autogenous mill and the ball mill, single-row metal-ceramic blocks 21, multi-row metal-ceramic blocks 22, or a combination of both can be flexibly selected, and a single metal-ceramic block 2 is placed horizontally or vertically on the first liner body and the second liner body.

[0072] Taking the layout design of boss 11 as an example: When the width of boss 11 is small, due to space limitations and stress characteristics, a single-row metal ceramic block 21 is selected and arranged longitudinally along the length of boss 11. This can ensure the wear resistance of key areas of the working surface and avoid the problems of insufficient casting space and reduced bonding strength caused by multiple rows.

[0073] When the width of the boss 11 is large, multiple rows of metal-ceramic blocks 22 can be arranged longitudinally to enhance the overall wear resistance and impact resistance by utilizing their array-type through-hole structure; alternatively, two single rows of metal-ceramic blocks 21 can be arranged longitudinally in parallel to expand the wear-resistant coverage area while ensuring casting quality, thus meeting the needs of wide bosses under high-intensity grinding conditions.

[0074] The thickness of the metal-ceramic block 2 ranges from 10mm to 70mm, with the specific value adjusted according to the thickness of different parts of the liner body. Taking the boss 11 as an example, since the boss 11 has the largest thickness and its working surface has higher requirements for wear resistance, the thickness of the metal-ceramic block 2 on the boss 11 is not less than the thickness of the metal-ceramic block 2 on the transition zone 12 and the base plate 13. Preferably, the thickness of the metal-ceramic block 2 on the boss 11 is greater than the thickness of the metal-ceramic block 2 in the other parts.

[0075] The preparation method of the composite liner is described.

[0076] S1: Prefabricated metal-ceramic block 2 with through holes;

[0077] S2: Create foam white molds for the first and second liner bodies, reserving fitting portions on their usable surfaces to match the metal-ceramic block 2. Place the metal-ceramic block 2 into the fitting portions;

[0078] S3: Evenly cover the surface of the foam white mold embedded with metal ceramic blocks 2 with refractory coating and let it dry to form an effective barrier layer;

[0079] S4: Place the foam white mold coated with refractory paint in a sand box and fill it with molding sand;

[0080] S5: Negative pressure evacuation to compact the molding sand and fix the foam white mold and metal-ceramic block 2;

[0081] S6: The molten metal of the first liner body and the second liner body is injected into the sand box through the gate, so that the foam white mold is heated and vaporized and disappears. The molten metal fills the space of the original foam model and undergoes an interfacial metallurgical bonding reaction with the metal ceramic block 2. A bottom pouring system is used when casting the molten metal.

[0082] S7: After the molten metal cools and solidifies, remove the blank workpiece and perform processing and heat treatment in sequence to obtain the final product.

[0083] The preparation process of the metal-ceramic block 2 in step S1 is carried out according to the following steps:

[0084] Raw material selection and proportioning: High-temperature resistant casting inorganic binder, FeCrC self-fluxing alloy powder, and ceramic particles are precisely proportioned at a mass ratio of 0.4:3:7 to 0.5:4:8. The ceramic particles are selected from 10-20 mesh zirconia alumina, black alumina, silicon carbide, or boron carbide. These particles have high hardness and strong wear resistance, significantly improving the wear resistance of the liner. The binder is a compound of high-temperature resistant inorganic mineral powder and inorganic resin, possessing excellent high-temperature bonding performance and capable of withstanding the strong impact of molten metal above 1400℃, ensuring the structural stability of the liner under high-temperature conditions. The FeCrC alloy powder particle size is controlled between 0.5 and 30 μm, and its addition amount is 25% to 35% of the ceramic particle mass. FeCrC alloy powder has good self-fluxing properties, and at high temperatures, it can form a strong metallurgical bond with ceramic particles and binder, enhancing the overall strength of the composite liner.

[0085] Mixing Process: The above raw materials are placed in a mixer and thoroughly mixed using mechanical stirring. During the stirring process, the FeCrC alloy powder is uniformly adhered to the surface of the ceramic particles by controlling the stirring speed and time, forming metal-ceramic hybrid particles with a binder coating. This mixing process ensures sufficient contact and uniform dispersion of the raw materials, laying the foundation for the subsequent casting process and ensuring the uniform and stable performance of all parts of the composite liner.

[0086] Molding Process: A foaming mold is selected as the molding carrier, and the uniformly mixed metal-ceramic granules are quantitatively filled into the mold cavity. A combined mechanical compaction and vibration process is employed. During compaction, pressure is applied through a hydraulic system to initially densify the material; simultaneously, the vibration device is activated, utilizing vibration energy to promote the filling and sliding of material particles, expelling internal air, eliminating voids, and achieving a high degree of material density. After compaction and vibration treatment, the mold is left to stand, allowing the material to further solidify naturally, forming a stable green body structure, providing a good foundation for subsequent drying processes.

[0087] Drying Process: The shaped green body is transferred to a temperature-controlled drying device. A stepped heating strategy is adopted, gradually heating to 200-250℃ at a heating rate of 80-150℃ / h. This heating rate effectively avoids excessive temperature difference between the inside and outside of the green body due to rapid heating, which can cause thermal stress and lead to defects such as cracking and deformation. After reaching the target temperature, a heat preservation treatment is performed to allow the internal moisture of the green body to evaporate fully and to promote the initial curing of the binder. After the heat preservation is completed, the heating system is turned off, and the green body is allowed to cool slowly to room temperature with the furnace. During this process, a series of physicochemical reactions occur inside the green body, ultimately forming a porous metal-ceramic block 2.

[0088] This structure not only endows the metal-ceramic block 2 with lightweight and high-strength properties, but also reduces the overall weight of the composite liner and improves the comprehensive performance of the liner.

[0089] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the figures shown are only one embodiment of the present invention; the actual structure is not limited thereto. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A composite liner for semi-autogenous mills and ball mills, comprising: A first liner body, comprising a boss (11) and a transition zone (12); the first liner body (1) is used in a semi-autogenous mill; The second liner body includes a boss (11), a transition zone (12) and a base plate (13), the base plate (13) being located between the two bosses (11); the second liner body is used in a ball mill. wherein The thickness of the boss (11) is greater than the thickness of the transition zone (12) or the base plate (13); Its characteristic is that it further includes a metal-ceramic block (2); wherein, The metal-ceramic blocks (2) are evenly distributed on the working surfaces of the first liner body and the second liner body; The metal-ceramic block (2) is provided with through holes, and the molten metal of the boss (11), transition zone (12) and base plate (13) is fused together with the metal-ceramic block (2) through the through holes.

2. A composite liner plate for use in semi-autogenous and ball mills as claimed in claim 1, wherein: Each of the metal-ceramic blocks (2) has at least two through holes, and the through holes are circular or square.

3. A composite liner for a semi-autogenous mill and a ball mill according to claim 1, characterized in that: The metal-ceramic block (2) includes a single-row metal-ceramic block (21) and a multi-row metal-ceramic block (22); The through holes of the single-row metal-ceramic block (21) are arranged in a straight line, while the through holes of the multi-row metal-ceramic block (22) are arranged in an array.

4. A composite liner for a semi-autogenous mill and a ball mill according to claim 3, characterized in that: The working surface of the first liner body is cast with a single-row type metal-ceramic block (21) and / or a multi-row type metal-ceramic block (22). The working surface of the second liner body is cast with a single-row type metal-ceramic block (21) and / or a multi-row type metal-ceramic block (22).

5. A composite liner for a semi-autogenous mill and a ball mill according to claim 2, characterized in that: When the through hole is circular, its diameter is A, and A ranges from 18mm to 23mm; the net distance between adjacent through holes is C, and A / 2≤C≤A; When the through hole is square, its side length is B, and B ranges from 20mm to 25mm; the net distance between adjacent through holes is D, and B / 2≤D≤B.

6. A composite liner plate for use in semi-autogenous and ball mills as claimed in claim 2, wherein: The metal-ceramic blocks (2) are arranged with gaps, and the net distance between two adjacent metal-ceramic blocks (2) is not less than 12mm.

7. A composite liner for a semi-autogenous mill and a ball mill according to claim 2, characterized in that: Along the length of the boss (11), at least one row of metal-ceramic blocks (2) are cast on the working surface of the boss (11). Along the width direction of the boss (11), the edge of the boss (11) has a gap with the edge of the metal ceramic block (2).

8. A composite liner plate for use in a semi-autogenous mill and ball mill as claimed in claim 1, wherein: The thickness of the metal-ceramic block (2) on the boss (11) is not less than the thickness of the metal-ceramic block (2) on the transition zone (12) and the base plate (13).

9. A composite liner for a semi-autogenous mill and a ball mill according to claim 1, characterized in that: The transition zone (12) includes a plane (121), an arc-shaped surface (122), and a buffer surface (123) connected in sequence. The boss (11) is located on the side of the buffer surface (123) away from the arc surface (122); The thickness of the transition zone (12) gradually increases along the direction from the plane (121) to the buffer surface (123).

10. A composite liner plate for use in a semi-autogenous mill and ball mill as claimed in claim 9, wherein: Along the length extension direction of the transition zone (12), the plane (121) and the buffer surface (123) are uniformly cast with metal ceramic blocks (2), while the arc surface (122) is not cast with metal ceramic blocks (2).

11. A composite liner plate for use in a semi-autogenous mill and ball mill as claimed in claim 9, wherein: Along the direction from the plane (121) to the buffer surface (123), the metal ceramic block (2) successively crosses the plane (121), the arc surface (122) and the buffer surface (123).

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