Grinding rotor for ore mill

Abstract

The invention relates to a grinding rotor for an ore mill. The grinding rotor includes a body configured as a disk having two opposing surfaces and a circumferential surface. The body is rotatable about a central axis and includes a plurality of protective elements uniformly spaced from each other on at least one of two surfaces of the body and protruding from the at least one surface. The body and the plurality of protective elements are made of a first material or a first composition. The first coating completely covers the main body and at least completely fills the space between the protection elements, so that a disc-shaped shell is formed on the main body, and the first coating is made of a second material or a second composition with the abrasion resistance lower than that of the first material or the first composition. The present application also relates to a method of manufacturing a grinding rotor, an ore grinding mill comprising said grinding rotor and a method of operating an ore grinding mill.

Description

Technical Field

[0001] This invention relates to a grinding rotor for an ore mill having a body configured in a disc shape. Furthermore, the invention also relates to a method for manufacturing a grinding rotor, an ore mill comprising at least one grinding rotor, and a method for grinding granular ore mineral materials. Background Technology

[0002] Grinding rotors for ore mills are used to agitate granular mineral ore material and grinding media within the mill body to obtain ground mineral particles. Typically, multiple grinding rotors are arranged on a shaft located within the mill body and rotated about an axis driven by this shaft. This rotation of the grinding rotors causes a circulating flow of the granular mineral ore material and grinding media within the mill body. This results in an abrasive action between the grinding media and the granular mineral ore material, breaking the latter into smaller mineral particles. However, the direct contact between the grinding material and the grinding rotor causes high wear on the grinding rotor, which can lead to severe damage and necessitate replacement. To address this issue, grinding rotors with protective elements have been developed.

[0003] For example, EP 4 132 713 describes a grinding rotor comprising a flat body having a rotation axis about which the body is configured to rotate during use, and a plurality of protective elements disposed on the body and extending laterally across the body. The protective elements are spaced apart from each other about the rotation axis, and at least some of the protective elements have rotational leading surfaces angled relative to orthogonal lines extending orthogonally from the rotation axis of the body. The protective elements are disposed on the body, extending laterally outward from one or two surfaces of the body, and extending beyond the outer edge of the body.

[0004] Another type of grinding rotor is described in EP 3 328 546. This grinding rotor includes one or more protective elements for deflecting particulate material and grinding media from the flat body. The protective elements extend radially from the outer edge of the body and radially from the opposite surface of the body.

[0005] However, such grinding rotors with protective elements still have some drawbacks, as described below: In vertical mineral ore mills, the grinding media, typically in the form of ceramic balls, fills only to a certain height within the mill body, leaving free space above the grinding media filling zone of the mill body. Granular mineral ore material is typically fed into the mill body through an inlet opening usually located at the bottom of the mill body, and then ascends through this free space. In this free space, a grinding rotor without protective elements can be used, as it is not expected to collide with the grinding media. However, during the operation of the ore mill, the height of the grinding media filling zone of the mill body typically increases. This leads to the problem that a grinding rotor without protective elements, initially located outside the grinding media filling zone, may subsequently be located within the grinding media filling zone due to the increased height. In this case, such a grinding rotor will experience significant wear and will therefore need to be replaced quickly. One possible solution to overcome this problem is to use a grinding rotor with protective elements located immediately above the grinding media filling zone at the start of the grinding operation. However, this leads to another problem, as some grinding media may be ejected from the grinding media filling area and struck by the protective elements against the inner wall of the mill body, causing damage to the inner wall. Summary of the Invention

[0006] The object of this invention is to create a grinding rotor that overcomes the disadvantages known in the prior art, and in particular, it can be used at any position on the shaft of a grinding mill while maintaining optimal wear resistance without increasing the risk of damage to the mill body.

[0007] The present invention is defined by the features of claim 1. According to the invention, a grinding rotor for an ore mill includes a body configured as a disk having two opposing surfaces and a circumferential surface. The body is rotatable about a central axis and includes a plurality of protective elements evenly spaced from and projecting from at least one of the two surfaces of the body. The body and the plurality of protective elements are made of a first material or a first composition. A first coating completely encloses the body and at least completely fills the space between the protective elements, thereby forming a disk-shaped shell on the body. The first coating is made of a second material or a second composition, the second material or second composition having lower wear resistance than the first material or first composition.

[0008] The first coating provides a substantially smooth surface to the grinding rotor, allowing it to be used outside the space filled with abrasive material without risking damage to the mill housing. When the grinding rotor is used within the space containing abrasive material, the interaction between the material and the rotor wears away the first coating over time, exposing the main body with multiple protective elements. Therefore, the external shape of the grinding rotor automatically adjusts over time according to the extent of its exposure to the abrasive material. Consequently, the grinding rotor will always exhibit an outer surface optimally adapted to the level of abrasive material within the mill housing where it is used—exposing protective elements in the space filled with abrasive material while maintaining a smooth outer surface in the space above the abrasive material.

[0009] Therefore, the grinding rotor according to the present invention can achieve the optimal grinding process, reduce the damage rate to the inner wall of the mill body, and reduce the wear of the grinding rotor.

[0010] The grinding rotor is disc-shaped, with a defined radius and a defined height in a direction perpendicular to the radius. The radius is greater than the height, preferably at least twice the height. The circumferential surface defines the circumferential edge surface of the main body.

[0011] The body includes a center of rotation coinciding with the center of the disk. A central axis intersects the center of rotation and is perpendicular to the radius of the disk. The central axis is therefore parallel to the height of the disk. The disk preferably includes a hole in the region of the center of rotation through which a mill shaft can be inserted. This hole is preferably circular and concentric with the center of rotation of the disk. Alternatively, the hole can be any suitable shape, such as rectangular, hexagonal, or any other polygonal shape. The body preferably includes a connecting device, preferably located next to or near the hole, for detachably connecting the body to the mill shaft.

[0012] The plurality of protective elements are preferably distributed at uniform angular intervals on at least one of the two opposing surfaces of the body. Preferably, the plurality of protective elements are spaced apart from each other at an angular interval of 360° / n, where n is the number of protective elements on the at least one surface.

[0013] The protective element protrudes from the at least one surface and is located away from the surface in a direction substantially parallel to the central axis.

[0014] The protective elements preferably extend from the center of rotation of the body or the edge of the hole located in the region of the center of rotation, reaching at least the circumferential surface of the body. Thus, the protective elements can follow a straight line from the center of rotation to at least the circumferential surface, or they can follow a curve or a wavy line. If the protective elements follow a wavy line, the wavy line is preferably sinusoidal. To avoid any imbalance of the body when it rotates about the central axis, the shape of the plurality of protective elements and their distribution on said at least one surface should such that the center of mass of the grinding rotor is located on the central axis.

[0015] In some embodiments, each protective element may be configured as a single block of any suitable shape, extending from the center of rotation to at least the circumferential surface of the body and following an imaginary line on the body. In other embodiments, each protective element may be configured as a series of protrusions following a straight, curved, or wavy imaginary line extending from the center of rotation to at least the circumferential surface of the body. If the imaginary line is wavy, it is preferably sinusoidal. The protrusions may be of any suitable shape, such as cubes, hemispheres, pyramids, rods, etc.

[0016] The protective element is preferably arranged on the radius of the main body, that is, the protective element follows an imaginary line that coincides with the radius of the main body. For a cuboid protective element, the central axis of the cuboid is preferably a radius parallel to the direction of the central axis. For a protective element that follows an imaginary wavy line, the bisecting axis of the imaginary wavy line preferably coincides with the radius of the main body.

[0017] If the protective element follows an imaginary curve, the curve of the imaginary line preferably begins at the center of rotation or the edge of the hole located in the region of the center of rotation, and extends along this curve at least to the circumferential surface of the body. Thus, upon reaching the circumferential surface, the imaginary line is arranged at an angle relative to the tangent of the circumferential surface. The curved imaginary line preferably has a constant radius, corresponding to a circular arc. In other embodiments, the curved imaginary line may be in the form of a partial ellipse, a hyperbola, or any other suitable curved shape.

[0018] In other preferred embodiments, the protective element may be tilted at a defined angle relative to the radius of the body. This means that the central axis of the cuboid-shaped protective element intersects the radius of the body at a defined angle. For a protective element following an imaginary wavy line, the bisector of the imaginary wavy line intersects the radius of the body at a defined angle. The central axis or bisector axis can thus intersect the radius at any point along the radius.

[0019] In a preferred embodiment, the protective element is configured as a disc that protrudes from at least one surface in a direction parallel to the central axis. Each of the discs preferably has a diameter extending at least from the circumferential surface to a hole located in the center of rotation region, i.e., the diameter of each disc corresponds to the distance along the radius of the body from the circumferential surface of the body to the edge of the hole, wherein the origin of each disc-shaped protective element is arranged on the radius of the body.

[0020] Preferably, all protective elements of the grinding rotor have the same shape and size. However, in some embodiments, the protective elements may have two or more different shapes and / or sizes. Preferably, however, all protective elements have the same extension in a direction parallel to the central axis, i.e., all protective elements have the same height relative to at least one surface. Preferably, the protective element has a substantially flat top surface, which is preferably parallel to at least one surface of the body. The top surface of the protective element is a surface spaced apart from at least one surface of the body.

[0021] The body and protective elements are made of the same first material. Preferably, the body and protective elements are made as a single molded part. For example, such a single molded part can be manufactured by die casting, compression molding, injection molding, milling, or any other suitable manufacturing method. In other preferred embodiments, the body and each of the plurality of protective elements are separate components, wherein the protective elements are then secured to the body, for example by welding, bonding, or by mechanical fasteners such as screws, bolts, rivets, etc.

[0022] The first material or first composition preferably has sufficient wear resistance to withstand wear caused by mill operation and collisions between abrasive materials (preferably in the form of ceramic balls) over several weeks of operation. The first material is preferably steel or a steel alloy. Preferably, the first composition comprises a polymer material, a fiber-reinforced polymer or resin material, or a vulcanized natural polymer material (NR), butadiene rubber (BR), or a mixture thereof.

[0023] The first coating covers the main body, meaning it completely covers the body of the grinding rotor. This means the first coating is applied to both surfaces of the main body and around its circumference. Furthermore, the first coating completely fills the space between the protective elements; any space between two adjacent protective elements is completely filled with the first coating. The first coating thus reaches at least the level of the top surface of the protective element in the direction of the central axis. In this way, the first coating forms a shell around the main body. This shell preferably has a substantially smooth surface, which further preferably has portions parallel to the two surfaces of the main body and portions parallel to its circumferential edge surfaces.

[0024] The second material or composition of the first coating has lower wear resistance than the first material or composition, therefore the first coating wears out faster when used in a grinding rotor in an ore mill. Preferably, the wear resistance of the second material or composition is at least 20% lower than that of the first material or composition, more preferably at least 30%, even more preferably at least 40%, and most preferably at least 50%.

[0025] Preferably, the volume loss of the first material is 30 mm. 3 Up to 60 mm 3 Between, measured according to standard ISO 4649:2017, method A.

[0026] Preferably, the volume loss of the second material is 65 mm. 3 Up to 160 mm 3 Between, measured according to standard ISO 4649:2017, method A.

[0027] It is important to note that higher volume loss indicates lower wear resistance compared to lower volume loss. In other words, the smaller the volume loss, the better the wear resistance of the material.

[0028] Preferably, the Shore A hardness of the first material is between 60 and 90. Experiments show that using a first material with a Shore A hardness within this range produces the best results because the first material can withstand the deformation caused by the impact of the abrasive media, while still yielding slightly under such impact, thus preventing the abrasive element from being ejected from the abrasive rotor with excessive kinetic energy.

[0029] Preferably, the tensile strength of the first material is between 16 MPa and 30 MPa, measured according to standard ISO 37:2017. Preferably, the elongation at break of the first material is between 480% and 650%, measured according to standard ISO 37:2017.

[0030] The tensile strength of the second material is preferably between 25 MPa and 35 MPa, measured according to standard ISO 37:1997. Preferably, the elongation at break of the second material is between 400% and 600%, measured according to standard ISO 37:2017.

[0031] Preferably, the first and second materials are mixtures of natural rubber (NR) and butadiene rubber (BR), and most preferably have the volume loss and tensile strength specified above. Alternatively, the first material may comprise natural rubber (NR) or a mixture of natural rubber (NR) and butadiene rubber (BR), while the second material comprises polyurethane, preferably a polyurethane based on polyether polyol or polyester polyol. Alternatively, the first material may comprise polyurethane, while the second material may comprise natural rubber (NR) or a mixture of natural rubber (NR) and butadiene rubber (BR).

[0032] Preferably, the body includes protective elements on both surfaces. Preferably, the protective elements have the same configuration on both surfaces, particularly in terms of shape, size, and / or spacing of the protective elements. Preferably, the configuration on both sides of the body, especially with respect to the configuration of the protective elements, is symmetrical with respect to a tangential plane that cuts the central axis of the body at a midpoint in the height direction.

[0033] Preferably, at least one of the plurality of protective elements protrudes beyond the circumferential surface of the body. This means that at least one protective element extends from the center of rotation beyond the circumferential surface of the body. Therefore, at least one protective element includes a portion forming a cantilever portion protruding from the circumferential surface of the body.

[0034] Preferably, all protective elements protrude beyond the circumferential surface of the body. However, in some embodiments, only a portion of the protective elements protrude beyond the circumferential surface of the body, such as half of the protective elements.

[0035] Preferably, at least one protective element is further configured to protrude from the circumferential edge surface of the body. This means that a portion of the at least one protective element hanging from the circumferential surface extends to at least partially cover the circumferential edge surface of the body.

[0036] If the body includes protective elements on both surfaces, the protective elements arranged symmetrically on the two surfaces are preferably connected to each other by means of portions that at least partially extend to cover the circumferential edge surfaces of the body. In this case, viewed from a direction perpendicular to the central axis, the protective elements and these portions form a C-shaped element.

[0037] Preferably, all of the multiple protective elements are completely covered by the first coating. This means that the first coating extends to cover each surface of the protective elements. Preferably, the first coating thus forms a disc-shaped housing that completely covers the grinding rotor. Of course, in order to use the grinding rotor in an ore mill, the housing includes holes that coincide with the holes in the disc-shaped body so that the grinding rotor can be arranged on the shaft of the ore mill.

[0038] Preferably, the body comprises a core made of metal or a metal alloy (preferably steel) that is completely encapsulated in a first material. This configuration provides the body with greater dimensional stability. The first material thus forms a second coating around the core. The core is also preferably disk-shaped, although small in size; that is, the radius and height of the core are smaller than the dimensions of the body.

[0039] Preferably, the first material or the first composition comprises at least one polyurethane, at least one natural rubber (NR), at least one butadiene rubber (BR), or a mixture thereof. Most preferably, the first material comprises a mixture of at least one natural rubber (NR) and at least one butadiene rubber (BR).

[0040] Preferably, the second material or the second composition comprises at least one polyurethane, at least one natural rubber (NR), at least one butadiene rubber (BR), or a mixture thereof.

[0041] Preferably, the body includes an annular groove that separates the disk into an outer annular element and an inner annular element. The two annular elements are concentric and connected to each other by at least two bridging elements. A plurality of protective elements are arranged on at least one surface of the outer annular element, and a first coating at least partially covers the outer annular element.

[0042] This application also relates to a method for manufacturing a grinding rotor for an ore mill. In a first step of the method, a body of the grinding rotor is manufactured. The body is configured as a disk having two opposing surfaces and a circumferential surface. The body is rotatable about a central axis and includes a plurality of protective elements uniformly spaced from each other and projecting from at least one of the two surfaces of the body. The body and the plurality of protective elements are made of a first material or a first composition. In a next step, a first coating is applied to the body and the space between the protective elements such that the body is completely covered and the space is at least completely filled by the first coating, which is made of a second material or a second composition having a lower abrasion resistance than the first material. Finally, the second material or the second composition is cured or vulcanized.

[0043] The grinding rotor manufactured by this method is preferably the grinding rotor according to the above-described embodiment.

[0044] The second material or composition is applied to the body in a flowable state by any suitable means, such as by spraying or casting, onto the body and the space therein. To prevent any leakage of the second material or composition, the application of the second material or composition is carried out in a mold in which the body may be placed.

[0045] The curing or vulcanization of the second material or the second composition can be carried out by any suitable means, such as by heating, irradiation with light of a specific wavelength, by applying a crosslinking agent or vulcanizing agent (such as sulfur, peroxide, metal oxide, acetoxysilane or urethane), by compression molding, etc.

[0046] The body can be manufactured by any suitable method, such as die casting, injection molding, compression molding, or milling.

[0047] This application also relates to an ore grinding mill, including a mill body and a motor. The mill body includes a drive shaft coupled to the motor and arranged within the mill body. A plurality of grinding rotors according to any of the above embodiments are spaced apart from each other on the drive shaft along its length.

[0048] The preferred type of ore grinding mill is a vertical ore grinding mill. Alternatively, a horizontal ore grinding mill may also be used. The drive shaft is preferably coupled to the motor via a suitable gear, such as a spur gear, preferably with multiple gear trains. The motor speed can be reduced by the gears, while the torque acting on the drive shaft can be increased. The motor is preferably an electric motor.

[0049] The mill body is preferably configured as a cylinder and preferably includes an inlet for introducing grinding media and granular ore material into the mill body, and an outlet for removing the ground mineral particles. The inlet is preferably located at the bottom of the mill body, and the outlet at the top. The long shaft of the mill body is preferably arranged perpendicular to the surface on which the ore mill is placed. In the case of a horizontal mill, the long shaft is preferably arranged horizontally, and most preferably parallel to the surface on which the ore mill is placed.

[0050] The mill body preferably includes multiple shelves arranged on the inner surface of the mill body. Such shelves improve grinding efficiency because they create additional grinding zones, thereby increasing the grinding force applied to the mineral ore particles. In addition, the shelves prevent mineral ore particles from bypassing the grinding rotor.

[0051] This application also relates to a method for grinding granular ore materials in an ore grinding mill, preferably in an ore grinding mill as described above. In the first step of the method, grinding media are introduced into the mill body of the ore grinding mill such that the mill body is at least partially filled with grinding media. Next, granular ore materials are introduced into the mill body. Subsequently, a drive shaft arranged within the mill body is operated by a motor. The drive shaft includes a plurality of grinding rotors according to any of the above embodiments. During operation, a first coating of the grinding rotor is eroded over time through interaction with the grinding media and the granular ore materials, thereby forming the external geometry of each grinding rotor, which corresponds to the hydrodynamically optimal shape of a particular grinding rotor along the shaft position.

[0052] The operation of the drive shaft, namely its rotation about its long axis, induces circumferential motion of the abrasive material and granular ore material located within the mill body. This circumferential motion causes abrasion between the abrasive material and the granular ore material, resulting in the latter being ground into smaller mineral particles.

[0053] The grinding material is preferably in the form of ceramic balls.

[0054] Other advantageous embodiments and combinations of features can be derived from the following detailed description and all claims. Attached Figure Description

[0055] The accompanying drawings used to explain the implementation scheme show:

[0056] Figure 1-3 According to a first embodiment of the grinding rotor of the present invention; Figure 4-6 : A second embodiment of the grinding rotor according to the present invention; Figure 7-9 The third embodiment of the grinding rotor according to the present invention; Figure 10-12 The fourth embodiment of the grinding rotor according to the present invention; Figure 13-15 The fifth embodiment of the grinding rotor according to the present invention; Figure 16-18 The sixth embodiment of the grinding rotor according to the present invention; Figure 19 A schematic side view of the main body of another embodiment of the grinding rotor according to the present invention; Figure 20 : A schematic side view of an embodiment of the ore grinding mill according to the present invention.

[0057] In the accompanying drawings, the same parts are given the same reference numerals. Detailed Implementation

[0058] Figures 1 to 3 A first embodiment of a grinding rotor 1 for a grinding mill according to the present invention is shown. Figure 1 This is a perspective view of the grinding rotor 1 after the first coating 13 has been removed. Figure 2 This is a perspective view of the grinding rotor 1 with the first coating 13. Figure 3 This is a perspective view of the grinding rotor 1 with a partial section of the first coating 13. See also... Figure 1The grinding rotor 1 includes a body 2 configured as a disc. The body 2 includes a first surface 3 and a second surface 4, the second surface 4 being opposite to and parallel to the first surface 3. Furthermore, the body 2 includes a circumferential surface 5. In the illustrated embodiment, the body 2 includes an annular groove 7 that divides the body 2 into an outer annular element 8 and an inner annular element 9. The outer annular element 8 and the inner annular element 9 are connected to each other by three bridging elements 10.1, 10.2, and 10.3, which radially span the annular groove 7. The body 2 includes a rotation center C, enabling the grinding rotor 1 to rotate about a central axis A containing the rotation center C and perpendicular to the surfaces 3 and 4 of the body 2. To enable rotation, a hole 11 is provided in the inner annular element 9 so that the grinding rotor 1 can be connected to a shaft of a grinding mill. To enable the shaft to transmit torque to the grinding rotor 1, a connecting device 12 is provided in the hole 11, the connecting device 12 in the illustrated embodiment being configured as a form-fitting element.

[0059] The grinding rotor 1 also includes a plurality of protective elements 6, which, in the illustrated embodiment, protrude from the first surface 3 and the second surface 4. Furthermore, in this embodiment, the protective elements 6 also protrude from the circumferential surface 5 of the body 2 and are all arranged on the outer annular element 8. In this embodiment, the protective elements 6 are generally cubic in shape, and each extends along the radius R of the body 2. The protective elements are evenly distributed along the entire circumference of the outer annular element 8.

[0060] The main body 2 and its protective element 6 are made of the same first material.

[0061] Figure 2 It shows the relationship with Figure 1 The diagram shows a perspective view of the same grinding rotor 1, but with a first coating 13 applied. The first coating 13 is made of a second material, which has lower wear resistance than the first material. In the illustrated embodiment, coating 13 is applied over the entire outer section 8 and completely covers the second section 8 and the protective element 6. This... Figure 3 Clearly visible in the middle, Figure 3 Showing Figure 2 The grinding rotor has a portion of the first coating 13 removed. It can be seen that the thickness of the first coating is chosen to be greater than the height of the protective element 6 so as to completely cover the protective element 6. Thus, the space between each protective element 6 is completely filled with the second material of the first coating 13. Figure 3 As can be clearly seen, the first coating 13 also completely covers the portion of the protective element 6 protruding from the circumferential surface 5 of the disk. Therefore, the first coating 13 provides an annular housing around the outer annular element 8 of the grinding rotor 1.

[0062] Figures 4 to 6 A second embodiment of a grinding rotor 1 for a grinding mill according to the present invention is shown. Figure 4This is a perspective view of the grinding rotor 1 with the first coating 13 removed in the second embodiment. Figure 5 This is a perspective view of the grinding rotor 1 with the first coating 13 in the second embodiment, and Figure 6 This is a perspective view of the grinding rotor 1 with the first coating 13 partially cut through.

[0063] Essentially, the grinding rotor 1 according to this embodiment includes a... Figures 1 to 3 The first embodiment shown has the same features. However, the configuration of some features is different.

[0064] The first obvious difference is that the outer annular element 8 is offset relative to the inner annular element 9 in the direction of the central axis A. Furthermore, the illustrated embodiment does not use three bridging elements 10.1, 10.2, 10.3, but only two bridging elements 10.1, 10.2 (where the second bridging element 10.2 is obscured by the outer annular element 8 in the perspective view used). Due to the offset of the outer annular element 8 relative to the inner annular element 9, the bridging elements 10.1, 10.2 are angled relative to the annular elements 8, 9. Another difference is the configuration of the protective element 6. In this embodiment, viewed from the direction of the first surface 3 or the second surface 4, the protective element 6 is wedge-shaped, each of which is angled relative to the radius R of the body 2.

[0065] Figures 7 to 9 A third embodiment of a grinding rotor 1 for a grinding mill according to the present invention is shown. Figure 7 This is a perspective view of the grinding rotor 1 with the first coating 13 removed according to the third embodiment. Figure 8 This is a perspective view of the grinding rotor 1 with the first coating 13 in the third embodiment, and Figure 9 This is a perspective view of the grinding rotor 1 with a partial cross-section of the first coating 13 in the third embodiment.

[0066] Essentially, the grinding rotor 1 according to the third embodiment includes a... Figures 1 to 3 The first implementation scheme shown and Figures 4 to 6 The second embodiment shown has the same features. However, the configuration of some features is different.

[0067] According to the third embodiment, the protective element 6 is configured as a disk arranged on the first surface 3 and the second surface 4 in the region of the outer annular element 8. The disk-shaped protective element 6 spans the entire width of the outer annular element 8 in the radial direction R of the body 2. This means that the diameter of each protective element 6 corresponds to the width of the outer annular element 8 in the radial direction R of the disk 2. Furthermore, the diameter of each disk-shaped protective element 6 coincides with the radius R of the body 2. Unlike the first and second embodiments, the protective element 6 does not protrude from the circumferential surface 5 of the body 2. Another difference is that bridging protective elements 14 are arranged on the two surfaces 3 and 4 of each of the bridging elements 10.1, 10.2, and 10.3.

[0068] Figures 10 to 12 A fourth embodiment of a grinding rotor 1 for a grinding mill according to the present invention is shown. Figure 10 This is a perspective view of the grinding rotor 1 with the first coating 13 removed according to the fourth embodiment. Figure 11 This is a perspective view of the grinding rotor 1 with the first coating 13 according to the fourth embodiment, and Figure 12 This is a perspective view of the grinding rotor 1 with a partial cross-section of the first coating 13 in the fourth embodiment.

[0069] Essentially, the configuration of the grinding rotor 1 according to the fourth embodiment is similar to Figure 7-9 The third embodiment shown differs in that the protective element 6 is dome-shaped, that is, the protective element 6 has a hemispherical shape.

[0070] Figures 13 to 15 A fifth embodiment of a grinding rotor 1 for a grinding mill according to the present invention is shown. Figure 13 This is a perspective view of the grinding rotor 1 with the first coating 13 removed according to the fifth embodiment. Figure 11 This is a perspective view of the grinding rotor 1 with the first coating 13 according to the fifth embodiment, and Figure 12 This is a perspective view of the grinding rotor 1 with a partial cross-section of the first coating 13 in the fifth embodiment.

[0071] Essentially, the grinding rotor 1 according to this embodiment includes a... Figures 1 to 3 The first embodiment shown has the same features. The only difference from the first embodiment is the shape of the protective element 6. In this embodiment, the protective element 6 is elliptical when viewed from the direction of one of the surfaces 3 and 4. Furthermore, the protective element 6 does not protrude from the circumferential surface 5 of the body 2.

[0072] Figures 16 to 18 A sixth embodiment of a grinding rotor 1 for a grinding mill according to the present invention is shown. Figure 16 This is a perspective view of the grinding rotor 1 with the first coating 13 removed according to the sixth embodiment. Figure 17This is a perspective view of the grinding rotor 1 with the first coating 13 according to the sixth embodiment, and Figure 18 This is a perspective view of the grinding rotor 1 with a partial cross-section of the first coating 13 in the sixth embodiment.

[0073] Essentially, the grinding rotor 1 according to this embodiment includes a... Figures 1 to 3 The first embodiment shown has the same features. The only difference from the first embodiment is the shape of the protective element 6. In this embodiment, the protective element 6 is semi-cylindrical and protrudes from each surface 3, 4. Furthermore, the protective element 6 does not protrude from the circumferential surface 5 of the body 2.

[0074] Figure 19 This is a schematic side view of the main body of another embodiment of the grinding rotor 1 according to the present invention. According to this embodiment, the main body 2 includes a core 15 made of metal or a metal alloy, which is completely covered by a first material 16. It should be noted that the protective element 6 in this embodiment is also made of the first material 16.

[0075] Figure 20This is a schematic side view of an embodiment of an ore grinding mill 17 according to the present invention. The ore grinding mill 17 includes a mill body 18 in the form of a vertical cylinder. The ore grinding mill 17 also includes a motor 19 that drives a drive shaft 20, which is at least partially arranged within the mill body 18. A plurality of grinding rotors 1.1, 1.2, 1.3, 1.4, 1.5, 1.6 according to any embodiment described herein are arranged on the drive shaft 20 to be driven to rotate by the motor 19. During operation, the mill body 18 is at least partially filled with grinding media, such that a space 21 filled with grinding media and a space 22 above the grinding media are formed within the mill body 18. When grinding granular ore material, the granular ore material is introduced into the mill body 17 through an inlet 24 located in the bottom region of the mill body 18. Subsequently, the granular ore material rises through the space 21 filled with grinding media to the space 22 above the grinding media. By rotating grinding rotors 1.1, 1.2, 1.3, 1.4, 1.5, and 1.6, a circulating flow of grinding media and granular ore material is induced within the space 21 filled with grinding media. The granular ore material is thus reduced in size through abrasive action with the grinding media (typically provided in the form of ceramic balls). The ground ore material is then removed from the mill body 18 through outlet 23 located in the top region of the mill body 17. The first coating 13 of the grinding rotors 1.1, 1.2, 1.3, 1.4, 1.5, and 1.6 is eroded by collisions with the grinding media and the granular mineral material. Thus, over time, the external shape of the grinding rotors 1.1, 1.2, 1.3, 1.4, 1.5, and 1.6 is eroded into an optimal shape suitable for their relative position within the space 21 filled with grinding media, wherein protective elements may be at least partially or completely exposed. It is important to note that the first coating of the grinding rotors 1.1 and 1.2 within the space 22 above the grinding media will not be eroded, thus preserving the housing with a smooth surface. This eliminates the risk that individual grinding media particles ejected from the space 21 filled with grinding media into the space 22 above the grinding media, if colliding with the protective elements of the grinding rotors 1.1 and 1.2, would be forcefully thrown against the inner wall of the mill body 18, potentially causing serious damage to the inner wall.

Claims

1. A grinding rotor for an ore mill, comprising a body of a disc configured to have two opposing surfaces and a circumferential surface, the body being rotatable about a central axis, and including a plurality of protective elements evenly spaced from and projecting from at least one of the two surfaces of the body, the body and the plurality of protective elements being made of a first material or a first composition, characterized in that, The body includes a first coating that completely or at least partially covers the body and at least completely fills the space between the protective elements, thereby forming a shell on at least a portion of the body. The first coating is made of a second material or a second composition, the second material or the second composition having lower abrasion resistance than the first material or the first composition.

2. The grinding rotor according to claim 1, characterized in that, The volume loss of the first material is 30 mm. 3 Up to 60 mm 3 between.

3. The grinding rotor according to claim 1 or 2, characterized in that, The volume loss of the second material is 65mm. 3 Up to 160 mm 3 between.

4. The grinding rotor according to any one of claims 1 to 3, characterized in that, The Shore A hardness of the first material is between 60 and 90.

5. The grinding rotor according to any one of claims 1 to 4, characterized in that, The body includes protective elements on both of its surfaces.

6. The grinding rotor according to any one of claims 1 to 5, characterized in that, At least one of the plurality of protective elements protrudes beyond the circumferential surface of the body.

7. The grinding rotor according to any one of claims 1 to 6, characterized in that, All of the multiple protective elements are completely covered by the first coating.

8. The grinding rotor according to any one of claims 1 to 7, characterized in that, The body comprises a core made of metal or metal alloy, preferably steel, which is completely encapsulated in the first material.

9. The grinding rotor according to any one of claims 1 to 8, characterized in that, The first material or the first composition includes at least one polyurethane or rubber.

10. The grinding rotor according to any one of claims 1 to 9, characterized in that, The second material or the second composition includes at least one polyurethane or rubber.

11. The grinding rotor according to any one of claims 1 to 10, characterized in that, The main body includes an annular groove that separates the disk into an outer annular element and an inner annular element. The two annular elements are concentric and connected to each other by at least two bridging elements. The plurality of protective elements are arranged on at least one surface of the outer annular element, and a first coating at least partially covers the outer annular element.

12. A method for manufacturing a grinding rotor, preferably a grinding rotor according to any one of claims 1 to 11, comprising the following steps: a) Manufacturing a body of the grinding rotor, the body being configured as a disk having two opposing surfaces and a circumferential surface, the body being rotatable about a central axis, and including a plurality of protective elements evenly spaced from each other and projecting from at least one of the two surfaces of the body, the body and the plurality of protective elements being made of a first material or a first composition; b) Applying a first coating to at least a portion of the body and into the space between the protective elements, such that the body is partially covered and the space between the protective elements is at least completely filled by the first coating, wherein the first coating is made of a second material or a second composition having a lower abrasion resistance than the first material; c) Curing or vulcanizing the second material or the second composition.

13. An ore grinding mill, comprising a mill body and a motor, wherein the mill body includes a drive shaft coupled to the motor and arranged within the mill body, characterized in that, Multiple grinding rotors according to any one of claims 1 to 11 are fastened to the drive shaft at intervals along the length of the drive shaft.

14. A method for grinding granular ore material in an ore grinding mill, comprising the following steps: a) Introducing grinding media into the mill body of the ore grinding mill, such that the mill body is at least partially filled with the grinding media; b) Introducing granular ore material into the mill body; c) A drive shaft arranged within the mill body by a motor, the drive shaft comprising a plurality of grinding rotors according to any one of claims 1 to 11; d) Wherein, the first coating of the grinding rotor is eroded over time through interaction with the grinding media and the particulate ore material, thereby forming the external geometry of each grinding rotor, which corresponds to the hydrodynamically optimal shape of a particular grinding rotor along the axis.

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