BR112019019641A2 - crushing mill, pulp lifter and external pulp lifter - Google Patents

Abstract

external pulp lifter (1) for a pulp lifter (2) for a rotary drum mill (3) comprises a first wall (4) facing the discharge end of the mill, and at least one reed (6) projecting from the inner surface (12) of the first wall (4) towards the interior of the drum grinding mill (3) and comprising a guide surface (10) on the front side of the reed (6) ). the outer edge (11) of the guide surface is angled with respect to the inner surface (12) of the first wall (4) in such a way that the angle (¿) between the inner surface (12) of the first wall (4) and the outer edge (11) of the guide surface (10) is less than 90 degrees.

Description

CRUSHING MILL, PULP LIFT AND EXTERNAL PULP LIFTING ELEMENT BACKGROUND [0001] The invention relates to crushing mills and, more particularly, to pulp lifters and external pulp lifting element.

[0002] One of the problems associated with pulp lifters is that the crushed material already raised to the pulp lifter tends to fall back into the crushing drum. This is inefficient in relation to both the flow regime and energy consumption.

BRIEF DESCRIPTION [0003] Thus, it is an objective of the present invention to provide a new grinding mill, a new pulp lifter and a new external pulp lifter. The purpose of the invention is achieved by means of a grinding mill, a pulp lifter and an external pulp lifter, which are characterized by what is established in the independent claims. Some preferred embodiments of the invention are set out in the dependent claims.

[0004] The invention is based on the idea of forming a receptacle in the pulp lifter by providing a reed of the pulp lifter at an angle to the wall of the lifter member.

[0005] An advantage of the arrangement of the invention is that a more efficient material flow and a lower energy consumption per unit of crushed material

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2/19 produced can be obtained with a simple structure. Some additional advantages are presented in the detailed description in connection with the modalities.

BRIEF DESCRIPTION OF THE DRAWINGS [0006] In the following, the invention will be described in greater detail by means of preferred modalities with reference to the accompanying drawings, in which:

[0007] Figure 1 illustrates a crushing mill;

[0008] Figure 2 illustrates a modality of an external pulp lifter element for a pulp lifter in connection with a detail of a pulp lifter assembly;

[0009] Figure 3 illustrates a modality of an external pulp lifter element for a pulp lifter in connection with a detail of a pulp lifter assembly;

[0010] Figure 4 illustrates a modality of an external pulp lifter element in connection with a detail of a pulp lifter assembly.

[0011] Figure 5 illustrates an external pulp lifter modality in connection with a detail of a pulp lifter assembly; and

[0012] The figure 6 illustrates a angle Θ in a external element of pulp lifting. DESCRIPTION DETAILED THE INVENTION [0013] The figure 1 illustrates a windmill

crushing 3, more specifically, a rotary drum crushing mill. Milling mills are used for processing hard solid material in such a way that

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3/19 large solid material is crushed into smaller pieces.

[0014] A grinding mill 3 can comprise a cylindrical casing 20 disposed about its longitudinal axis D which extends in a horizontal direction. The material to be crushed can be received in the cylindrical casing 20, for example, through a feed chute (not numbered). Crushing takes place inside the cylindrical casing 20 by lifting and dumping the material to be crushed inside the cylindrical casing 20. Lifting bars or lifting plates (not shown, but their places inside the cylindrical casing are indicated by dotted lines in figure 1) can be used to lift the material into the cylindrical casing. According to one embodiment, loose grinding elements, such as balls comprising, for example, metal or stone material, can be provided within the cylindrical shell to aid in grinding.

[0015] The grinding mill 3 can comprise at least one inlet 21 for receiving a continuous supply of material to be crushed. The material to be crushed can comprise, for example, mineral ore. The crushing mill 3 can also comprise at least one outlet 22 for continuous discharge of the crushed material. The crushed material may comprise, for example, ore slurry. Inlet (s) 21 and outlet (s) 22 may be provided at opposite ends of the cylindrical shell in the direction of the longitudinal axis D of the cylindrical shell. Thus, a continuous grinding process can be provided by means of

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4/19 feeding of material to be crushed in the cylindrical casing 20 through the inlet (s) 21, crushing the material to be crushed while it is moved through the cylindrical casing 20 and moved inside the cylindrical casing by lifting and dumping the material to be crushed on its way through the cylindrical casing 20, and discharging the crushed material through outlet (s) 22 at the opposite end of the cylindrical casing.

[0016] The grinding mill 3 may further comprise a grid 23 provided between the interior of the cylindrical casing 20 and the outlet 22. The grid 23 may comprise openings 31 for the passage of crushed material particles of a predetermined or smaller size. In other words, the openings 31 can be sized such that particles of a predetermined or smaller size pass through the openings 31 and can thus be moved towards the outlet 22, and particles that are larger than the predetermined size do not. pass through the openings, but fall back into the cylindrical casing for further crushing. Thus, the grid prevents the passage of particles larger than the predetermined size through the grid. The grinding mill 3 can also comprise a spillway 24 provided at the outlet end 22 of the grinding mill to discharge the crushed material through outlet 22.

[0017] The shredder 3 can also comprise a pulp lifter 2. The pulp lifter 2 can comprise at least one external pulp lifter and / or a pulp lifter 2

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5/19 provided between the grid and the unloader to guide the crushed material from the cylindrical casing to the unloader 24. More specifically, the pulp lifter 2 can be arranged to lift the crushed material passed through the grid 23 to the outlet 22 for unloading the crushed material through the unloader 24, when the pulp lifter is arranged to rotate together with the cylindrical casing about the longitudinal geometric axis D of the cylindrical casing. Depending on the mode, the pulp lifter 2 can be arranged to rotate, together with the cylindrical casing, in a clockwise or counterclockwise direction. Different configurations of such an external pulp raising and / or pulp raising element 2 are described in the description.

[0018] The pulp lifter 2 may comprise at least one external pulp lifter element 1. Typically, a pulp lifter 2 comprises multiple external pulp lifter elements. According to one embodiment, an external pulp-lifting element comprises a shape of a sector or a truncated sector and a number of such external pulp-lifting elements can be arranged circumferentially side by side, by means of the gual the external pulp lifter elements can form a disc shape or a ring-shaped pulp lifter 2. According to one embodiment, a pulp lifter 2 can comprise from 15 to 35 external pulp lifter elements. According to another embodiment, a pulp lifter 2 can comprise from 18 to 32 elements

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6/19 external pulp lifting.

[0019] The disc-shaped or ring-shaped pulp lifter 2 can comprise a conical shape as can be seen in Figure 1, for example. The pulp lifter 2 can be arranged at the end of the cylindrical casing and to fit the end of the cylindrical casing in such a way that the midpoint F of the pulp lifter 2 can be arranged on the longitudinal axis of the cylindrical casing. The pulp lifter can be rotatably arranged in the grinding mill 3, so that the pulp lifter 2 is rotatable together as an entity with the cylindrical housing 20 around the longitudinal axis D of the cylindrical housing. Depending on the modality, all the external pulp lifter elements in a pulp lifter 2 can be similar to each other or a pulp lifter 2 can comprise different types of external pulp lifter elements.

[0020] Figures 2, 3, 4 and 5 illustrate modalities of an external pulp lifter for a pulp lifter 2, such as a pulp lifter 2 for a rotary drum crushing mill 3. More particularly, Figure 2 illustrates a part of such a pulp lifter 2 for a rotary drum crushing mill 3. The outer pulp lifter can form a truncated sector or sector of an external pulp lifter. In other words, the external polpal lifting element can comprise a sector-like shape or a truncated sector shape and a plurality of such elements

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7/19 external pulp lifter can be provided circumferentially, side by side to form an external pulp lifter from a pulp lifter 2.

[0021] The external pulp lifting element may comprise a first wall 4 facing the discharge end of the grinding mill 3. In other words, the first wall 4 can be arranged on the side of the external pulp lifting element which is opposite the side where the grid 23 is provided.

[0022] The outer pulp lifting element may also comprise at least one vane 6 projecting from the inner surface 12 of the first wall 4 towards the interior of the drum grinding mill 3. The vanes 6 can be arranged to survey the material passed through the grid 23 towards the middle of the pulp lifter 2 and, thus, towards the exit. According to one embodiment, the outer pulp-lifting element can comprise exactly one reed 6. According to another embodiment, the external pulp-lifting element can comprise two reeds 6 or a plurality of reeds 6. According to yet another mode, a reed 6 may extend to two or more external pulp lifting elements. In other words, a reed 6 can comprise parts of a reed that can be provided in different external pulp lifting elements, so that the reed 6 is formed when the external pulp lifting elements are assembled together.

[0023] Each reed 6 can extend from an external part of the external element of

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8/19 pulp lift towards the inner end 9 of the pulp lift external element. In other words, the reed can extend from an area on the perimeter or an area close to the perimeter towards the middle point F of the pulp lifter 2. Thus, the inner end of the outer lifting element refers to the end of the element pulp lifter facing the middle point F of the pulp lifter 2.

[0024] The vane 6 may comprise a guide surface 10 on the front side of the vane 6. The front side of the vane 6 refers to the first side of the vane 6 in the direction of rotation. In other words, the front side of the reed is the first side receiving the crushed material, such as slurry, for example, ore slurry, when the pulp lift, and more particularly the reed 6, is in the cycle elevation. The front side of the reed thus depends on the direction of rotation of the pulp lifter 2. In a pulp lifter 2 turned in the first direction, the front side of the reed is thus located on the first side of the reed 6, whereas the front side of the reed is the opposite side of the reed compared to the first side when the pulp lifter 2 is rotated in the opposite direction.

[0025] According to an embodiment, the reed 6 can extend radially from the outside of the external pulp lifting element towards the internal end of the external pulp lifting element, as in the modalities of Figures 4 and 5 .

[0026] According to another modality, the

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9/19 pallet 6 can extend from the outside of the external pulp lifting element towards the internal end of the external pulp lifting element in a curved manner, as in the modalities of Figures 2 and 3. In other words , the reed 6 may comprise a concave guide surface 10 forming a spiral formation together with an internal part of the pulp lifter 2. In an embodiment with an opposite direction of rotation compared to Figures 2 and 3, an opposite direction of Spiral movement would provide a similar effect of optimally guiding the crushed material towards the middle of the pulp lifter.

[0027] At least a part of an outer edge of the guide surface 10 can be angled with respect to the inner surface 12 of the first wall 4. Throughout the description this feature is referred to as the outer edge 11 of the guide surface 10 angled in relative to the inner surface 12 of the first wall 4, for clarity, although the purpose of the angular relationship is to form a receptacle shape, preventing the crushed material from falling off the guide surface and the effect can be obtained, even if only a part of the outer edge 11 was angled with respect to the inner surface 12 of the first wall 4.

[0028] The outer edge 11 of the guide surface 10 comprises the edge of the guide surface closest to the outer perimeter of the pulp lifter 2. According to one embodiment, the outer edge 11 of the guide surface 10 may have a profile or form a straight line and this line can be angled in relation to the surface

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10/19 inner 12 of the first wall 4. According to another embodiment, the outer edge 11 of the guide surface 10 can comprise a profile or concave shape, in which at least part of the outer edge 11 is angled with respect to the inner surface 12 of the first wall 4. The angled part of the outer edge may, in such modality, also refer to the direction of a tangent along the concave outer edge 11. Similarly, the outer edge of the guide surface may comprise a convex profile or shape. , and the angled part of the outer edge can thus also comprise a tangent along the convex outer edge 11. Of course, the outer edge 11 can comprise a profile or shape that is a combination of curved and straight parts, so at least at least a part of the outer edge 11 is angled with respect to the inner surface 12 of the first wall 4.

[0029] The angle Θ between the inner surface of the first wall 4 and the outer edge 11 of the guide surface 10 can be less than 90 degrees. The inner surface 12 of the first wall 4 can be parallel to the head of the mill. In other words, the inner surface 12 of the first wall 4 can be parallel to the discharge end of the mill. The effect of the angle Θ between the inner surface 12 of the first wall 4 and the outer edge 11 of the guide surface 10 being less than 90 degrees is that this directs the flow of crushed material, such as flow of slurry, towards the back of the pulp lifter in a more efficient manner. An angle Θ in an external pulp lifting element and a direction of rotation C is

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11/19 shown in detail in Figure 6 for clarification. In a pulp lifter with an opposite direction of rotation, a similar angle, but on the opposite side of the outer pulp lifter, would have the same effect.

[0030] Some advantages of this type of external pulp lifting element include preventing crushed material, such as slurry, from being poured back into the drum, that is, into the cylindrical casing, but without the need for adding complexity to the pulp lifting structure to keep the material crushed in the pulp lifter; keep the flow of crushed material away from the rear face of the grid, which typically has a rough texture and tends to decrease the flow of the material, thus decreasing the efficiency of the mill; and reducing wear on the rear side of the grid, since crushed material, such as slurry, occurs along the rear of the grid.

[0031] According to one embodiment, the angle Θ between the inner surface 12 of the first wall 4 and the outer edge 11 of the guide surface 10 can be less than 88 degrees. According to another embodiment, the angle Θ between the inner surface 12 of the first wall 4 and the outer edge 11 of the guide surface 10 can be in the range of 20 to 70 degrees. This is particularly beneficial, since angles Θ of less than 20 degrees between the inner surface 12 of the first wall 4 and the outer edge 11 of the guide surface 10 are more difficult and expensive to construct, while angles of 70 degrees or less can provide good orientation properties

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12/19 for the outer pulp-lifting element and its guide surface 10. According to an additional embodiment, the angle Θ between the inner surface 12 of the first wall 4 and the outer edge 11 of the guide surface 10 may be at range of 30 to 60 degrees. According to yet another embodiment, the angle Θ between the inner surface 12 of the first wall 4 and the outer edge 11 of the guide surface 10 can be approximately 45 degrees.

[0032] According to one embodiment, for example, one of Figure 3, an external pulp lifter element may comprise a second surface 7 extending in a radial direction B of the pulp lifter 2 and forming a front surface of the pulp pulp lifting element in the direction of rotation of the pulp lifter 2. The front surface of the pulp lifting element refers to the first surface in the direction of rotation C, which is the surface through which the material is crushed, such as slurry, from an external pulp raising element, more particularly preceding, adjacent, first enters the external pulp raising element in question. The second surface 7 can comprise an opening 8 for receiving crushed material from an adjacent external pulp lifting element. According to one embodiment, the second surface can be substantially perpendicular to the first wall 4.

[0033] In such an embodiment, the direction of the inner surface 12 of the first wall 4 can be defined by the side edge of the opening 8 of the first wall 4 which extends in the direction A-A 'in Figure 6

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13/19 parallel to the mill head and in the radial direction B of the pulp lifter 2. The outer edge of the guide surface can comprise the outer edge of the opening. The angle Θ between the inner surface 12 of the first wall 4 and the outer edge 11 of the guide surface 10 can then comprise the angle between the lateral edge of the opening 8 of the first wall 4, and the outer edge of the opening 8, such as as seen in Figure 6, for example.

[0034]

According to one embodiment, the reed can have an equal angle between the inner surface of the first wall and the guide surface 10 along the entire length of the guide surface 10. In other words, the reed 6 can be angled at an angle. similar degree along the entire length of the guide surface 10, that is, it can have the same angle compared to the direction AA 'in Figure 6, for example, along the reed from the outer end of the reed, which is the end closest to the outer end of the pulp lifter, to the inner end of the reed, that is, the end closest to the grinder mill outlet and unloader.

[0035]

According to one embodiment, the angle between the inner surface 12 of the first wall 4 and the guide surface 10 of the reed 6 can vary along the length of the guide surface 10. According to one embodiment, the angle between the inner surface 12 of the first wall 4 and the guide surface 10 of the reed 6 can be reversed at a point on the guide surface 10. In such embodiments, thus, the angle between the inner surface 12 of the first wall 4 and the guide surface 10

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14/19 of the reed 6 at the inner end of the reed and / or at a point along the guide surface of the reed, may differ from the angle Θ between the inner surface 12 of the first wall 4 and the outer edge 11 of the guide surface 10. With such modalities, an improved movement of the crushed material along the guide surface 10 can be obtained. One modality, where the angle is reversed in

a dot of the surface in guide, can be particularly beneficial to guide dumper and exit. O material crushed to the [0036] From steel rdo with one modality, the

external pulp lifting element may comprise solid cast steel material. According to another embodiment, the external pulp lifting element may comprise a rubber material finish with a steel structure provided on the inside. According to an additional embodiment, the external pulp lifting element may comprise an elastomeric material, such as urethane.

[0037] According to one embodiment, a pulp lifter 2 for a rotary drum grinding mill 3 can comprise at least one external pulp lifter as described in that description.

[0038] According to an embodiment, the pulp lifter 2 can further comprise an internal pulp lifter 16. The reed 6 can then extend to the internal pulp lifter 16.

[0039] According to one embodiment, at least a part of the guide surface of the part of

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15/19 internal pulp lift of the pallet 6 can also be angled with respect to the internal surface of the rear wall 18 of the internal pulp lifter. According to another embodiment, the guide surface 17 of the internal pulp lifter part of the pallet 6 can be arranged on an opposite side of the pallet 6 in the area of the internal pulp lifter when compared to the area of the external pulp lifter.

opposite side of the reed 6 refers to the rear side of the reed in the direction of rotation of the pulp lifter. This is beneficial since the crushed material falls to the operational side due to gravity if the material exceeds the top, that is, if it does not leave the pulp lifter through the outlet at the highest point of the pulp lifter's rotation cycle. According to another embodiment, the reed 6 can also extend to the unloader 24.

[0040] According to one embodiment, at least a part of the guide surface 25 of the discharging part of the reed 6 can also be angled with respect to the internal surface of the discharger wall 26. That internal surface of the discharger wall 26 can form an substantially continuous surface with the inner surface of the rear wall 18 of an inner pulp lifting element6 and the inner surface 12 of the first wall 4 of an outer pulp lifting element, when the outer pulp lifting element, the inner element of polpal6 lifting and unloader 24 are mounted together, for example, in a crushing mill 3.

[0041] According to one embodiment, the grid 23 may comprise at least one grid lifter 27

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16/19 arranged on the inner side of the cylindrical wrapper of the grid 23 to guide particles of the crushed material into the pulp lifter 2 through the openings in the grid 23. This can occur in a similar way to that of the vanes in the pulp lifter; that is, the grid lifters can lift the crushed material as the grid rotates. The outer edge 28 of the guide surface of the grid 30 can then be angled with respect to a grid wall 29 facing inwardly of the cylindrical housing 20 in such a way that an angle α between the grid wall 29 and the guide surface grid lifter 30 is less than 90 degrees at least on the outer edge of the grid lifter 27.

[0042] According to another modality, the angle α can be less than 8 8 degrees. According to another modality, the angle α can be in the range of 20 to 70 degrees. According to another modality, the angle α can be in the range of 30 to 60 degrees. According to yet another embodiment, the angle α can be approximately 45 degrees.

[0043] According to one embodiment, the angle α can vary over the length of the grid lifting guide surface, according to one embodiment, the angle α can be reversed at a point on the guide surface of the grid lifter 30. In such embodiments, therefore, the angle at the inner end of the grid lifter and / or at a point along the guide surface of the grid lifter may be different from angle a. With such modalities, an improved movement of the crushed material along the guide surface of the grid lifter 30 can be

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Obtained 17/19. One embodiment, where the angle is reversed at a point on the guide surface of the grid lifter, can be particularly beneficial in guiding the crushed material to the pulp lifter.

[0044] According to an embodiment, the grid lifter and the pulp lifter can be arranged on top of each other, and the angle can extend through both the grid lifter and the pulp lifter. Thus, the inner face of both the grid lifter and the pulp lifter can be tilted.

[0045] The grid lifter may comprise a radial, curved or spiral shape. Thus, depending on the intended use, combinations of grid lifter form and pulp lift vane form can be combined in different ways, such as by combination of radial grid lifters and radial pulp lift vane, grid lifters in spiral and spiral pulp lift vanes, radial grid lift and spiral pulp lift vanes or spiral grid lift and radial pulp lift vanes.

[0046] According to one embodiment, the same angle Θ can also be extended to the grid lifter, that is, the grid lift guide surface and the pulp lift guide surface can have the same angle. These guide surfaces can even form a continuous guide surface on both sides of the grid.

[0047] According to one embodiment, the grinding mill may comprise a grinding mill at

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18/19 wet. The grinding mill can then further comprise at least one inlet to receive a continuous feed of a liquid process substance. Depending on the embodiment, this entry for the process liquor may comprise entry 21 or a separate entry for the process liquor.

[0048] According to one embodiment, the grinding mill 3 may comprise at least one of the following: a grid discharge ball mill, a SAG mill and an AG mill.

[0049] According to one embodiment, an external pulp raising element, an internal saving raising element / or a pulp lifter may comprise an extra part of a crushing mill according to one embodiment, that extra part may be mounted retroactively on an existing grinding mill. The pulp lifter and its structural parts described in this description, such as the outer pulp lifter, the inner lifter to save the harrow lifter, can be retroactively mounted in an existing grinding mill, although this was of a conventional design, such as radial or spiral pulp lifters, conventional and / or grid lifters in existing crushing mills. In other words, the structural parts of a mill of a conventional design can be replaced by structural parts described in this description. Thus, a smoother and more efficient flow of the crushed material can be obtained and even a longer life cycle of the spare parts.

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19/19 [0050] It will be obvious to those skilled in the art that, as technology advances, the inventive concept can be implemented in several ways. The invention and its modalities are not limited to the examples described above, but may vary within the scope of the claims.

Claims (22)

1. External pulp lifting element (1) for a pulp lifter (2) for a rotary drum grinding mill (3), the external pulp lifting element (1) forming a sector or a truncated sector of a external pulp lifter and comprising: a first wall (4) facing the discharge end of the grinding mill, and at least one vane (6) protruding from the inner surface (12) of the first wall (4) at towards the inside of the drum grinding mill (3), extending from an external part of the external pulp lifting element (1) towards the internal end (9) of the external pulp lifting element (1) , and comprising a guide surface (10) on the front side of the reed (6), characterized by the fact that at least part of the outer edge (11) of the guide surface (10) is angled with respect to the inner surface (12 ) of the first wall (4) in such a way that the angle ( ) Between the inner surface (12) of the first wall (4) and the outer edge (11) of the guide surface (10) is smaller than 90 degrees. 2. External pulp lifting element (1) according to claim 1, wherein the angle (Θ) between the inner surface (12) of the first wall (4) and the outer edge (11) of the guide surface ( 10) is less than 88 degrees. External pulp lifting element (1) according to claim 1 or 2, wherein the angle (Θ) Petition 870190094207, of 9/20/2019, p. 51/64 2/6 between the inner surface (12) of the first wall (4) and the outer edge (11) of the guide surface (10) is in the range of 20 to 70 degrees. External pulp lifting element (1) according to any one of claims 1 to 3, wherein the angle (Θ) between the inner surface (12) of the first wall (4) and the outer edge (11) of the guide surface (10) is in the range of 30 to 60 degrees. External pulp lifting element (1) according to any one of claims 1-4, wherein the reed (6) extends radially from the external part of the external pulp lifting element towards the inner end of the pulp. external pulp lifting element. An external pulp lifting element (1) according to any one of claims 1-4, wherein the reed (6) extends from the external part of the external pulp lifting element towards the internal end of the element pulp lifting device in a curved manner. External pulp lifting element (1) according to either of claims 1-4 or claim 6, wherein the external pulp lifting element (1) comprises a second surface (7) substantially perpendicular to the first wall ( 4) extending in a radial direction (B) of the pulp lifter (1), forming a front surface of the pulp lifter (1) in the direction of rotation (C) of the pulp lifter (2), and comprising a opening (8) for receiving crushed material from an element Petition 870190094207, of 9/20/2019, p. 52/64 3/6 external pulp lifting adjacent, such that the direction of the inner surface (12) of the first wall (4) is defined by the lateral edge of the first wall (4) of the opening (8) extending in the direction (A- A ') parallel to the mill head and the radial direction (B) of the pulp lifter (1), the outer edge (11) of the guide surface (10) comprises the outer edge of the opening (8) and The angle (Θ) between the inner surface (12) of the first wall (4) and the outer edge of the guide surface (10) comprises the angle between the lateral edge of the first wall (4) of the opening (8) and the edge opening of the opening (8). External pulp lifting element (1) according to any one of claims 1 to 7, wherein the reed (6) has an equal angle between the inner surface (12) of the first wall (4) and the surface of guide (10) along the entire length of the guide surface (10). External pulp lifting element (1) according to any one of claims 1-7, wherein the angle between the inner surface (12) of the first wall (4) and the guide surface (10) of the reed varies along the length of the guide surface (10), so that the angle between the inner surface (12) of the first wall (4) and the guide surface (10) of the reed (6) at the inner end of the reed and / or at a point along the guide surface of the reed, it differs from the angle (Θ) between the inner surface (12) of the first wall (4) and the outer edge (11) of the surface of Petition 870190094207, of 9/20/2019, p. 53/64 4/6 guide (10). External pulp lifting element (1) according to any one of claims 1 to 9, wherein the external pulp lifting element comprises solid molten steel material. External pulp lifting element (1) according to any one of claims 1 to 10, wherein the external pulp lifting element comprises a rubber material finish with steel structure provided inside. External pulp lifting element (1) according to any one of claims 1 to 11, wherein the external pulp lifting element comprises an elastomeric material. 13. Pulp lifter (2) for a rotary drum grinding mill (3), characterized by the fact that the pulp lifter (2) comprises at least one external pulp lifter (1) according to any one claims 1-12. A pulp lifter (2) according to claim 13, wherein the pulp lifter comprises an internal pulp lifter (16) and the reed (6) extends to the inner pulp lifter (16). Pulp lifter (2) according to claim 14, wherein at least a part of the guide surface (17) of the inner pulp lifter part of the reed (6) is also angled with respect to the inner surface of the wall rear (18) of the internal pulp lifter. 16. Pulp lifter (2) according to Petition 870190094207, of 9/20/2019, p. 54/64 5/6 claim 15, wherein the guide surface (17) of the internal pulp lifter part of the reed (6) is arranged on an opposite side of the reed (6), in the area of the internal pulp lifter, when compared to the area of the external pulp lifter. 17. Milling mill (3) comprising: a cylindrical casing (20) rotatably arranged around its longitudinal axis (D) extending in a horizontal direction, at least one inlet (21) to receive a continuous supply of material to be crushed at least one outlet (22) ) for continuous discharge of the crushed material, a grid (23) between the inside of the cylindrical casing (20) and the outlet (22) comprising openings for the passage of crushed material particles of a predetermined or smaller size, whereby the grid prevents the passage of parts larger than the predetermined size through the grid, and a discharger (24) provided at the outlet end (22) of the mill to discharge the crushed material through the outlet (22), characterized by the fact that a lifting element pulp (1) according to any one of claims 1 to 12 and / or a pulp lifter (2) according to any one of claims 13-16, is provided between the harrow and the unloader to guide the crushed material from the cylindrical casing to the unloader (24). 18. Grinding mill (3) according to claim 17, wherein the reed (6) extends to the Petition 870190094207, of 9/20/2019, p. 55/64 6/6 unloader (24). Grinding mill (3) according to claim 18, wherein at least a part of the guide surface (25) of the discharging part of the reed (6) is also angled with respect to the internal surface of the discharging wall (26) . Grinding mill (3) according to any one of claims 17 to 19, wherein the grid (23) comprises at least one grid lifter (27) arranged on the inside of the cylindrical housing of the grid (23) for guide particles of the crushed material into the pulp lifter (2) through the openings in the grid (23), and where the outer edge (28) of the guide surface of the grid (30) is inclined with respect to a grid wall (29) facing the inside of the cylindrical casing (20) in such a way that the angle (a) between the grid wall (29) and the guide surface of the grid lifter (30) is less than 90 degrees at least on the outer edge of the grill lifter (27). 21. The grinding mill according to any one of claims 17 to 20, wherein the mill comprises a wet grinding mill and comprises at least one inlet to receive a continuous supply of liquid process substance. 22. Grinding mill according to any one of claims 17-21, wherein the grinding mill comprises at least one of the following: a grid discharge ball mill, a SAG mill and an AG mill.