High-wear-resistance mixing blade for copper concentrate mixing

Abstract

The utility model discloses a kind of high wear-resisting stirring paddles for copper concentrate mixed ore, belong to mineral processing equipment technical field, in view of the problem that stirring paddle material receiving surface and end face are seriously worn due to high hardness material continuous impact in copper concentrate mixed ore operation, leading to short service life and frequent replacement increase cost, provide a solution, including paddle main body, paddle main body is provided with at least two fixed holes, its outer edge one side is equipped with convex edge and is integrally formed with paddle main body, jointly define material receiving surface, the side of convex edge away from paddle main body is end face;Wear plate includes that first wear plate is welded on material receiving surface, second wear plate is welded on end face, strengthen high wear area by welding wear plate, disperse stress and reduce main body loss.The paddle is mainly used for copper concentrate mixed ore stirring equipment, improve wear resistance and service life, reduce maintenance downtime, guarantee production efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of mineral processing equipment technology, specifically relating to a high wear-resistant stirring blade for mixing copper concentrate with a raised edge structure and wear-resistant plates welded to the surface. Background Technology

[0002] In copper concentrate blending operations, the mixer blades are the core component for achieving uniform mixing of materials. Copper concentrate, due to its high hardness (Mohs hardness can reach 6-7), coarse particles, and abrasive properties, experiences continuous impact and wear on the blade surface during high-speed mixing. This wear is particularly severe on the blade's facing surface (the area directly in contact with the material) and end faces (the edges that contact the sidewalls or bottom of the mixing vessel), where it is subjected to high-speed scouring and friction. Taking a typical copper concentrate blending production line as an example, traditionally made blades from a single material (such as ordinary alloy steel) have an average service life of only about 15 days without special wear-resistant strengthening treatment. Frequent blade replacements not only increase spare parts procurement costs but also require frequent downtime for maintenance, reducing the effective operating time of the production line and significantly impacting production efficiency and enterprise capacity.

[0003] To improve the wear resistance of impeller blades, the industry has attempted to adopt a split-type wear-resistant structure. For example, patent CN110328422A proposes a "wear-resistant impeller for mixing and stirring" solution. This solution uses screw fastening combined with copper powder melting process to fix the wear-resistant head, which has significant drawbacks: insufficient interface bonding strength, screws are prone to loosening or breaking under high-frequency impact, causing the wear-resistant head to fall off. At the same time, the connecting layer formed by copper powder melting is prone to fatigue cracks and fretting wear under long-term vibration load, reducing structural stability; the risk of high-temperature welding damage is significant. The connection between the wear-resistant head and the substrate requires high-temperature melting at 800–1000℃, while hard alloy materials (such as tungsten carbide) will undergo metallographic phase transformation at temperatures exceeding 1000℃, resulting in decreased hardness and increased brittleness, which weakens the wear resistance; the structure is highly complex, the precision machining requirements for the assembly groove and end are stringent, and the melting process takes as long as 36–48 hours, significantly increasing production costs.

[0004] Furthermore, while wear-resistant overlay technology is widely used, its thickness is typically limited to no more than 8 mm due to process bottlenecks, and it is prone to failure due to brittle spalling. Once local spalling occurs, wear will spread rapidly, leading to the complete scrapping of the blade. Therefore, there is an urgent need for a wear-resistant blade technology that combines high interfacial bonding strength, low risk of thermal damage, and structural stability to adapt to the high-wear conditions of copper concentrate mixed ore. Utility Model Content

[0005] One object of this invention is to solve at least the problems described above and to provide at least the advantages that will be explained later.

[0006] To achieve these objectives and other advantages of this utility model, a high wear-resistant stirring impeller for copper concentrate mixing is provided, characterized in that it comprises:

[0007] The blade body has at least two fixing holes. A raised edge is provided on one side of the outer edge of the blade body. The raised edge is integrally formed with the blade body. The outer edge of the blade body and the outer edge of the raised edge together define the receiving surface. The side of the raised edge away from the blade body is the end face.

[0008] The wear-resistant plate includes a first wear-resistant plate and a second wear-resistant plate. The first wear-resistant plate is welded to the material-facing surface, and the second wear-resistant plate is welded to the end face.

[0009] Due to the high hardness and coarse particle size of copper concentrate, the material continuously impacts the blade edge area during mixing, causing rapid wear of the unprotected blade body material (such as ordinary metal). In traditional designs, the feed-facing and end faces of the blade body are the main impact areas, lacking targeted protection, resulting in uneven wear and susceptibility to localized failure. This forces frequent downtime for replacement, increasing maintenance costs and reducing production efficiency. Specifically, the feed-facing and end faces, formed integrally with the blade body, are wear hotspots. Existing technologies have not optimized the wear-resistant structure of these areas, leading to a shortened overall lifespan. This invention addresses this by welding a first wear-resistant plate and a second wear-resistant plate to the feed-facing and end faces of the blade body, respectively. This design specifically strengthens the structural integrity of high-wear areas. The feed-facing and end faces, formed integrally with the blade body, directly bear the material impact, and the wear-resistant plates effectively disperse mechanical stress, reducing material loss. This enhances the overall wear resistance of the blade and reduces the risk of failure due to localized wear. Simultaneously, the fixing holes ensure installation stability, and the raised edge structure optimizes material flow and improves mixing uniformity. Overall, the solution extends the maintenance cycle and improves reliability in harsh mixed ore environments.

[0010] Preferably, the wear-resistant sheet is made of tungsten carbide cemented carbide or high-performance ceramic material.

[0011] In the high-impact, high-friction environment of mixed copper concentrate, wear-resistant plates must withstand extreme mechanical stress and chemical corrosion. If the material's hardness or wear resistance is insufficient (such as with ordinary alloys), the wear-resistant plates will wear out rapidly, failing to effectively protect the blade body and leading to premature failure. This invention uses tungsten carbide cemented carbide or high-performance ceramic materials to manufacture wear-resistant plates, utilizing their high hardness and excellent wear resistance to improve impact and corrosion resistance. The chemical stability of tungsten carbide cemented carbide reduces corrosion loss, while the low coefficient of friction of ceramic materials alleviates material adhesion; both are well-suited to the high-wear characteristics of copper concentrate. Material selection ensures that the wear-resistant plates maintain surface integrity during long-term operation, avoiding premature failure due to material softening or fragmentation. This enhances the durability of the blades, reduces unexpected downtime caused by material mismatch, and supports continuous production.

[0012] Preferably, a thermal expansion transition layer is provided between the first wear-resistant plate and the material-facing surface of the blade body, and between the second wear-resistant plate and the end face of the blade body, wherein the thermal expansion transition layer is made of a nickel-based alloy.

[0013] During mixing operations, temperature fluctuations (such as frictional heat or environmental changes) cause inconsistent expansion and contraction of different materials (such as tungsten carbide wear-resistant plates and alloy steel bodies), resulting in tensile stress concentration at the interface. Traditional direct-welded structures lack buffering, and stress accumulation easily leads to the formation and propagation of microcracks, reducing bond strength. In long-term operation, crack propagation may cause wear-resistant plates to detach or blades to fail, especially under high-frequency thermal cycling conditions. This problem has not been addressed in the basic design, affecting the reliability of the blades in dynamic thermal environments. The nickel-based alloy thermal expansion transition layer of this invention absorbs thermal mismatch strain through gradient design, alleviating interfacial thermal stress. This layer acts as a buffer medium, reducing the difference in expansion coefficients between the tungsten carbide wear-resistant plates and the alloy steel body, suppressing tensile stress accumulation. Metallurgical bonding enhances interfacial adhesion, preventing microcrack formation during thermal cycling. This improves the adhesion stability of the wear-resistant plates in temperature-fluctuating environments and reduces the risk of detachment. Overall, the transition layer optimizes thermomechanical properties, ensuring the long-term structural reliability of the blades under dynamic conditions.

[0014] Preferably, the interface between the thermal expansion transition layer and the wear-resistant sheet is provided with periodically distributed mechanical anchoring units, the mechanical anchoring units comprising:

[0015] A frustum-shaped blind hole that penetrates the thermal expansion transition layer;

[0016] The protrusion, made of tungsten carbide, is set on the wear-resistant plate and its shape corresponds to and matches the shape of the frustoconical blind hole.

[0017] During mixer operation, mechanical vibration generates periodic shear stress, which acts on the interface between the thermal expansion transition layer and the wear-resistant sheet. Traditional thermal expansion transition layers experience stress concentration at the interface, easily leading to fatigue crack initiation and propagation, especially when thermal stress is superimposed on vibration. If cracks propagate along the interface, it can cause the wear-resistant sheet to loosen or detach, reducing structural integrity. While thermal expansion transition layers alleviate thermal stress, they are not optimized for vibration and cannot suppress crack growth under dynamic loads, requiring additional mechanical reinforcement. This invention utilizes a mechanical anchoring unit composed of a frustum-shaped blind hole and protrusions. Through an interlocking structure, the interfacial shear stress is converted into local compressive stress, inhibiting crack propagation. The protrusions embedded in the blind hole form a physical anchor, enhancing the bond strength between the transition layer and the wear-resistant sheet. Under vibration loads, this design disperses periodic stress, reducing fatigue crack initiation. The mechanical interlocking provides additional failure paths, delaying interface delamination. This improves the vibration resistance of the wear-resistant sheet in dynamic environments, ensuring the structural integrity during long-term operation.

[0018] Preferably, the bottom diameter of the frustum-shaped blind hole is 15%-25% of the thickness of the wear-resistant sheet, the depth is 60%-80% of the thickness of the transition layer, and the center-to-center distance between adjacent blind holes is 2-3 times the bottom diameter.

[0019] The frustum-shaped blind holes and protrusions require specific dimensions to optimize stress conversion: if the blind holes are too large or too shallow, the interlocking strength is insufficient, failing to effectively convert shear stress into compressive stress; if the dimensions are too small or densely distributed, processing becomes difficult and local stress concentration is easily triggered. Traditional solutions do not define parameters, potentially leading to uneven stress distribution and poor crack suppression. Under vibration loads, improper dimensions accelerate interface fatigue and weaken the long-term stability of the anchoring unit. This invention optimizes the stress conversion effect of mechanical anchoring by defining the bottom diameter, depth, and spacing parameters of the frustum-shaped blind holes. Reasonable dimensions ensure moderate interlocking strength between the blind hole and the protrusions: the ratio of the bottom diameter to the wear-resistant plate thickness enhances load-bearing capacity, the ratio of the depth to the transition layer thickness ensures embedding stability, and the spacing design avoids stress overlap. This improves the uniformity of interface stress distribution and prevents local overload. Under vibration conditions, parametric design enhances crack suppression efficiency and extends the service life of the anchoring unit.

[0020] Preferably, the edges of both the first and second wear-resistant sheets are rounded, and the radius of the rounded corners is 10%-20% of the thickness of the wear-resistant sheets.

[0021] The edges of wear-resistant pads (especially the facing and end faces) are the direct impact points of materials. Sharp edges are prone to high stress concentration factors, leading to the initiation of microcracks. Traditional wear-resistant pads have untreated edges, concentrating impact energy at the corners, causing edge fragmentation or spalling. This not only reduces wear resistance but may also contaminate mixed mineral materials. This problem is particularly prominent in coarse-particle environments like copper concentrate, but the basic design does not consider edge geometry optimization, increasing maintenance frequency. This invention's wear-resistant pad features a rounded edge design that reduces the stress concentration factor, alleviating high edge stress under impact loads. The optimized geometric transition between the rounded radius and thickness disperses material impact energy, reducing microcrack initiation in corner areas. This prevents edge chipping or fragment detachment, maintaining the surface integrity of the wear-resistant pad. Simultaneously, the rounded corners improve material flow, reducing localized wear hotspots. Overall, this design improves the impact resistance of the wear-resistant pad and reduces maintenance requirements.

[0022] Preferably, a plurality of stress dispersion grooves are provided on the surface of the wear-resistant sheet. The stress dispersion grooves are V-shaped grooves, the depth of which is 15%-25% of the thickness of the wear-resistant sheet, and the width is 1-1.5 times the depth.

[0023] Repeated impacts of copper concentrate particles on the surface of the wear-resistant sheet create localized high-stress points, making it prone to surface crack initiation. Without a stress-dispersing structure, these cracks propagate rapidly, leading to spalling or fragmentation. Traditional smooth surfaces cannot interrupt the transfer of impact energy, and stress concentration areas become crack sources, reducing the overall lifespan of the wear-resistant sheet. This problem is exacerbated, especially under non-uniform loads, leading to localized wear. The introduction of V-shaped stress-dispersing grooves in this invention disperses surface impact energy through a geometric interruption effect, inhibiting crack initiation. The groove depth and width ratio optimizes stress release, and the V-shaped structure guides crack direction, delaying propagation. The groove distribution enhances surface crack resistance and reduces localized high-stress points. Under high-frequency impact, this design improves the overall toughness of the wear-resistant sheet, preventing surface spalling. This extends the lifespan of the wear-resistant sheet and ensures stability during the mixing process.

[0024] Preferably, the stress dispersion grooves are staggered on the surface of the wear-resistant sheet, and the distance between adjacent grooves is 2-3 times the width of the groove.

[0025] If the V-grooves are unevenly distributed (e.g., parallel arrangement), the areas between the grooves may become stress concentration weak points, preventing the impact energy from being evenly distributed and causing cracks to preferentially initiate along specific paths. If the groove arrangement is not optimized, too small a spacing between the grooves will weaken the material strength, while too large a spacing will reduce coverage efficiency and affect the overall geometric interruption effect. Under random impact conditions, groove distribution defects may accelerate surface failure, necessitating improved stress dispersion uniformity. The staggered distribution of stress dispersion grooves in this invention ensures uniform impact energy distribution, preventing the areas between the grooves from becoming weak points. The staggered arrangement optimizes the coverage efficiency of the grooves, and the ratio of spacing to groove width prevents stress concentration, improving overall surface strength. The geometric interruption effect is maximized, inhibiting crack propagation along specific paths. Under random impact loads, this design enhances the fatigue resistance of the wear-resistant sheet, supporting long-term reliable operation. After the above treatment, the average service life of the agitator blades is extended from approximately 15 days to approximately 180 days, an increase of more than 10 times.

[0026] Other advantages, objectives and features of this invention will be partly apparent from the following description, and partly understood by those skilled in the art through study and practice of this invention. Attached Figure Description

[0027] Figure 1 This is a structural schematic diagram of one technical solution of this utility model;

[0028] Figure 2 This is a schematic diagram of the structure of the first wear-resistant sheet and the expansion transition layer of this utility model;

[0029] Figure 3 This is a schematic diagram of the structure of the second wear-resistant sheet of this utility model.

[0030] 1. Blade body; 2. Fixing hole; 3. Raised edge; 4. First wear-resistant plate; 5. Second wear-resistant plate; 6. Expansion transition layer; 7. Frustum-shaped blind hole; 8. Stress dispersion groove. Detailed Implementation

[0031] The present invention will now be described in further detail with reference to the accompanying drawings, so that those skilled in the art can implement it based on the description.

[0032] It should be understood that terms such as “having,” “comprising,” and “including” as used herein do not exclude the presence or addition of one or more other elements or combinations thereof.

[0033] It should be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "setting" should be interpreted broadly. For example, they can refer to fixed connection or setting, detachable connection or setting, or integral connection or setting. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. The terms "lateral," "longitudinal," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0034] like Figure 1 As shown, this utility model provides a high wear-resistant stirring impeller for mixing copper concentrate, characterized in that it comprises:

[0035] The blade body 1 has at least two fixing holes 2. A protruding edge 3 is provided on one side of the outer edge of the blade body 1. The protruding edge 3 is integrally formed with the blade body 1. The outer edge of the blade body 1 and the outer edge of the protruding edge 3 together define the receiving surface. The side of the protruding edge 3 away from the blade body 1 is the end face.

[0036] The wear-resistant plate includes a first wear-resistant plate 4 and a second wear-resistant plate 5. The first wear-resistant plate 4 is welded to the material receiving surface, and the second wear-resistant plate 5 is welded to the end face.

[0037] The blade body 1 is integrally cast from high-strength alloy steel, and commonly used engineering materials such as 42CrMo or 40CrNiMo can be selected. The outer edge of the body and the flange 3 are integrally formed, together forming the feed surface (working surface) and the end face (lateral contact surface). The number of fixing holes 2 can be two, three, or four, with a diameter of 18-22mm, and they are symmetrically distributed in the blade mounting area. Bolts pass through the fixing holes 2 and are fixedly connected to the stirring shaft. The wear-resistant plates are prefabricated parts with a thickness of 8-12mm. The first wear-resistant plate 4 covers the entire feed surface area, and the second wear-resistant plate 5 completely covers the end face. A 0.5-1mm expansion gap is reserved at the joint of the wear-resistant plates. Vacuum brazing is used for welding. The brazing filler metal can be BAg-8 silver-based alloy or BNi-2 nickel-based brazing filler metal, and the welding temperature is controlled in the range of 850-950℃.

[0038] The receiving surface and end face are treated with a belt abrasive grinder to a surface roughness of Ra1.2±0.4μm. The wear-resistant sheet is positioned using tooling fixtures; permanent magnet positioning fixtures or mechanical clamps can be used to ensure a positional accuracy of ≤0.3mm. Vacuum brazing is performed in a cold-wall furnace.

[0039] Technical Effects: This technical solution optimizes the material flow field distribution through an integrated convex edge 3 structure, ensuring that impact loads are evenly transferred to the wear-resistant plates. The double wear-resistant plate full-coverage design completely protects the high-wear area, preventing the substrate from directly contacting the material. Vacuum brazing ensures the metallurgical bonding strength at the interface, overcoming the defects of traditional bolted connections that are prone to loosening. The overall structure exhibits stable impact resistance under copper concentrate conditions, reducing unplanned downtime maintenance requirements and extending the overall service life of the blades.

[0040] In another technical solution, the wear-resistant plate is made of tungsten carbide cemented carbide or high-performance ceramic material.

[0041] The cobalt content of the binder phase in the tungsten carbide cemented carbide composition is controlled at 8%-12%, the tungsten carbide grain size is 1.2-2.5μm, and the hardness range is HRA88-92; the ceramic material can be alumina-toughened zirconia (ZTA) or reaction-bonded silicon carbide (RBSiC), of which the zirconia phase transformation toughening content of ZTA ceramic is 15%-20%.

[0042] In another technical solution, a thermal expansion transition layer 6 is provided between the first wear-resistant plate 4 and the material-facing surface of the blade body 1, and between the second wear-resistant plate 5 and the end face of the blade body 1. The thermal expansion transition layer 6 is made of a nickel-based alloy.

[0043] The thermal expansion transition layer 6 is made of a nickel-based alloy, such as Inconel 625 or Hastelloy C-276, which are commercial alloys. The thickness of the transition layer is controlled within the range of 0.8-1.2 mm, and the coefficient of thermal expansion is between that of the alloy steel of the blade body 1 and the tungsten carbide of the wear-resistant plates. Before assembly, the feed surface and end face of the blade body 1 are sandblasted using 24-mesh brown corundum abrasive, achieving a surface roughness of Ra3.2-Ra3.8 μm, and then thoroughly cleaned.

[0044] In another technical solution, periodically distributed mechanical anchoring units are provided on the interface between the thermal expansion transition layer 6 and the wear-resistant sheet, the mechanical anchoring units comprising:

[0045] A frustum-shaped blind hole 7 penetrates the thermal expansion transition layer 6;

[0046] The protrusion, made of tungsten carbide, is set on the wear-resistant plate and corresponds to the shape of the frustoconical blind hole 7.

[0047] A frustum-shaped blind hole 7 is machined onto the surface of the nickel-based alloy transition layer. The cone angle of the blind hole is set to 15°±1°, the bottom diameter is 20%±2% of the wear-resistant sheet thickness (2.0±0.2mm when the wear-resistant sheet is 10mm thick), and the depth is 70%±5% of the transition layer thickness (0.7±0.05mm when the transition layer is 1mm thick). The protrusion on the bottom surface of the wear-resistant sheet can be formed by laser cladding. In a vacuum brazing furnace, the wear-resistant sheet and the transition layer are precisely assembled using a special alignment fixture, with the fitting clearance of the protrusion embedded in the blind hole ≤0.01mm. BNi-5 nickel-based brazing filler metal sheet, 0.1mm thick, is used for brazing and placed on the surface of the transition layer.

[0048] In another technical solution, the bottom diameter of the frustum-shaped blind hole 7 is 15%-25% of the thickness of the wear-resistant sheet, the depth is 60%-80% of the thickness of the transition layer, and the center-to-center distance between adjacent blind holes is 2-3 times the bottom diameter.

[0049] The diameter of the bottom surface of the frustum-shaped blind hole 7 is strictly controlled to be 20% ± 2% of the wear-resistant sheet thickness, and the depth is 70% ± 5% of the transition layer thickness (0.7 ± 0.05 mm when the transition layer is 1.0 mm). The center-to-center distance between adjacent blind holes is fixed at 2.5 times the bottom surface diameter (5.0 mm when the bottom surface diameter is 2 mm). The blind holes are machined using a precision CNC EDM machine, and a three-axis linkage EDM forming machine can be selected. The electrode is a copper conical electrode (cone angle 15° ± 0.5°). The transition layer material can be Inconel 625 nickel-based alloy plate, with a thickness tolerance controlled within ± 0.03 mm.

[0050] In another technical solution, the edges of the first wear-resistant sheet 4 and the second wear-resistant sheet 5 are both provided with rounded corners, and the radius of the rounded corners is 10%-20% of the thickness of the wear-resistant sheet.

[0051] The radius of the corner fillet on the wear-resistant sheet is set to 15% ± 2% of the thickness (1.5 ± 0.2 mm for a 10 mm thick wear-resistant sheet). Machining is performed using a CNC vertical grinder, with a diamond wheel (120 grit) for contour shaping. The corner transition areas must be smoothly connected, with a surface roughness Ra ≤ 0.8 μm. For ceramic wear-resistant sheets, wet grinding with a diamond wheel can be used, and a water-based emulsion can be selected as the coolant.

[0052] In another technical solution, a plurality of stress dispersion grooves 8 are provided on the surface of the wear-resistant sheet. The stress dispersion grooves 8 are V-shaped grooves. The depth of the stress dispersion grooves 8 is 15%-25% of the thickness of the wear-resistant sheet, and the width is 1-1.5 times the depth.

[0053] The stress dispersion groove 8 adopts a V-shaped cross-section design, with a depth set at 20% ± 2% of the wear-resistant sheet thickness (2.0 ± 0.2 mm for a 10 mm thick wear-resistant sheet), and a width 1.2 times the depth (i.e., 2.4 mm). The bottom fillet radius is controlled at 0.2 ± 0.05 mm, and the groove wall inclination angle is 60° ± 2°. A five-axis machining center can be selected for machining, using diamond-coated end mills.

[0054] In another technical solution, the stress dispersion grooves 8 are staggered on the surface of the wear-resistant sheet, and the distance between adjacent grooves is 2-3 times the width of the groove.

[0055] The stress dispersion grooves 8 adopt an alternating arrangement pattern, with the center-to-center distance between adjacent grooves fixed at 2.5 times the groove width (6.0 mm when the groove width is 2.4 mm). The distribution angle is set to 60°±5°, forming an equilateral triangular grid.

[0056] Although the embodiments of this utility model have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for this utility model. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, this utility model is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A highly wear-resistant stirring impeller for mixing copper concentrate, characterized in that, include: The blade body has at least two fixing holes. A raised edge is provided on one side of the outer edge of the blade body. The raised edge is integrally formed with the blade body. The outer edge of the blade body and the outer edge of the raised edge together define the receiving surface. The side of the raised edge away from the blade body is the end face. The wear-resistant plate includes a first wear-resistant plate and a second wear-resistant plate. The first wear-resistant plate is welded to the material-facing surface, and the second wear-resistant plate is welded to the end face.

2. The high wear-resistant stirring impeller for copper concentrate mixing according to claim 1, characterized in that, The wear-resistant pad is made of tungsten carbide cemented carbide or high-performance ceramic material.

3. The high wear-resistant stirring impeller for copper concentrate mixing according to claim 1, characterized in that, A thermal expansion transition layer is provided between the first wear-resistant plate and the material-facing surface of the blade body, and between the second wear-resistant plate and the end face of the blade body. The thermal expansion transition layer is made of a nickel-based alloy.

4. The high wear-resistant stirring impeller for copper concentrate mixing according to claim 3, characterized in that, The interface between the thermal expansion transition layer and the wear-resistant sheet is provided with periodically distributed mechanical anchoring units, the mechanical anchoring units comprising: A frustum-shaped blind hole that penetrates the thermal expansion transition layer; The protrusion, made of tungsten carbide, is set on the wear-resistant plate and its shape corresponds to and matches the shape of the frustoconical blind hole.

5. The high wear-resistant stirring impeller for copper concentrate mixing according to claim 4, characterized in that, The bottom diameter of the frustum-shaped blind hole is 15%-25% of the thickness of the wear-resistant sheet, the depth is 60%-80% of the thickness of the thermal expansion transition layer, and the center-to-center distance between adjacent blind holes is 2-3 times the bottom diameter.

6. The high wear-resistant stirring impeller for copper concentrate mixing according to claim 1, characterized in that, The edges of both the first and second wear-resistant sheets are rounded, and the radius of the rounded corners is 10%-20% of the thickness of the wear-resistant sheets.

7. The high wear-resistant stirring impeller for copper concentrate mixing according to claim 6, characterized in that, The surfaces of both the first and second wear-resistant sheets are provided with multiple stress-dispersing grooves. The stress-dispersing grooves are V-shaped grooves, with a depth of 15%-25% of the thickness of the wear-resistant sheet and a width of 1-1.5 times the depth.

8. The high wear-resistant stirring impeller for copper concentrate mixing according to claim 7, characterized in that, The stress dispersion grooves are staggered on the surface of the wear-resistant sheet, and the distance between adjacent grooves is 2-3 times the width of the groove.

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