EP0304414A2 - Procédé de broyage pour broyeur-tambour à billes, broyeur-tambour à billes et revêtement pour broyeur - Google Patents

Procédé de broyage pour broyeur-tambour à billes, broyeur-tambour à billes et revêtement pour broyeur Download PDF

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Publication number
EP0304414A2
EP0304414A2 EP88890208A EP88890208A EP0304414A2 EP 0304414 A2 EP0304414 A2 EP 0304414A2 EP 88890208 A EP88890208 A EP 88890208A EP 88890208 A EP88890208 A EP 88890208A EP 0304414 A2 EP0304414 A2 EP 0304414A2
Authority
EP
European Patent Office
Prior art keywords
balls
grooves
drum
grinding
depth
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP88890208A
Other languages
German (de)
English (en)
Other versions
EP0304414A3 (fr
Inventor
Rupert Strobl
Franz Scheucher
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Boehler GmbH
Boehler GmbH Germany
Original Assignee
Boehler GmbH
Boehler GmbH Germany
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Boehler GmbH, Boehler GmbH Germany filed Critical Boehler GmbH
Publication of EP0304414A2 publication Critical patent/EP0304414A2/fr
Publication of EP0304414A3 publication Critical patent/EP0304414A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
    • B02C17/18—Details
    • B02C17/22—Lining for containers

Definitions

  • the invention relates to a grinding process for ball tube mills, the grinding drum of which is equipped with grinding plates, the lateral surfaces of which have grooves for the balls which crush the material to be ground. Furthermore, the invention relates to a ball tube mill, the drum of which is equipped with grinding plates, the grinding surfaces of which have grooves running essentially in the circumferential direction for the balls comminuting the ground material and, if appropriate, webs lying between the grooves. Finally, the invention relates to a grinding plate for tubular ball mills of this type.
  • grinding plates are known from AT-PS 283 092, in the construction of which this slip is consciously taken into account in order to use this provided friction mechanism on the wall to an increased extent for comminuting the ground material.
  • the coarse grinding is a specific essential Lich higher energy expenditure per cm2 generated surface requires than the subsequent fine grinding. The reason for this is that the large grains of the feed material can only be drawn in with difficulty from a dense spherical packing of the grinding media, since the grains dodge; The grains must therefore be used several times and attempts must be made to feed them in several times, which increases the energy requirement.
  • the grain size distribution of the feed material with high d supervised Montgomery values and possibly high grinding resistances entails special measures for the known mill armouring for pre-comminution or design of the grinding plates for the coarse grinding area.
  • Such a special measure is the combination of a known groove armor (AT-PS 283 092) with grinding plates with wavy grooves of constant depth according to AT-PS 379 762.
  • AT-PS 283 092 known groove armor
  • the expected improvement occurs, if at all, only in special grinding situations, since an intensified Cataract stress also causes an increased power requirement of the mill drive.
  • the object of the invention is to create a ball tube mill or to design its inner lining in such a way that, in particular in the area of the mill inlet, ie in the coarse size reduction area, a gradual influencing of the cataract movement or loosening of the grinding media is possible, whereby the feed conditions for the regrind with, for example high d80 values between the balls and between the balls and the grooved grinding plates can be improved.
  • a d80 value means an 80% sieve pass with a certain mesh size; eg if the passage of a mill feed through a sieve with a 10 mm mesh size is 80% and thus 20% of the grains are larger than 10 mm. This value is used to calculate the grinding energy.
  • Such mills are used primarily for grinding minerals, cement clinker, limestone, ores, etc.
  • a grinding process of the type mentioned at the outset is characterized in that to improve the material intake and the friction behavior in the longitudinal direction of the drum successive balls or in the longitudinal direction of the drum successive rows of balls extending in the circumferential direction or in the longitudinal direction of the drum successive ball layers formed by superimposed balls or rows of balls during their opposite the rotational direction of the drum, the circulating movement is subjected to a mutual relative movement, in particular by raising or lowering balls, rows of balls or ball layers in the radial direction, which have different circumferential positions from one another in the drum, and returning them to their starting position.
  • a ball tube mill according to the invention is characterized in that, preferably in the mill inlet, in particular in the area of coarse grinding, in order to improve the intake conditions for the material to be ground, grooves are provided in the grinding plates with a depth which changes, in particular decreasing, along the circumference of the drum.
  • a grinding plate according to the invention is characterized in that the grinding plate has, in addition to grooves with a constant depth, grooves with a variable depth, which essentially have a depth have a continuously or evenly decreasing groove outlet and / or a groove inlet which increases or abruptly increases or abruptly decreases with respect to its groove depth, for example in the form of a vertical shoulder.
  • This procedure or this design of a ball tube mill makes it possible to draw the regrind better into the ball aggregate, since this temporarily deviates from the shape of a densest ball packing due to the relative movement of the individual balls or rows of balls or ball layers and the regrind into the open spaces can be better fed.
  • the grinding media are located in the drum in a bed in the form of the densest packing of balls, the balls being circulated or the balls which are lifted the highest in the course of the rotation of the drum falling into a lower position.
  • the balls in contact with the drum wall follow the surface shape of the grinding plates and can be raised or lowered radially by appropriate shaping of the grinding plates and pass this movement on to radially internal balls, so that entire layers of balls that run perpendicular to the drum axis are moved.
  • the balls return to their starting position by lowering, in which they are arranged in a side-by-side position with the balls that remained in adjacent grooves.
  • a ball causes lifting of radially inner balls as it is lifted; due to the hexagonally closest packing, the packing is also disturbed in neighboring rows of balls. By lifting or lowering balls, they get a different peripheral speed, so that differences in the ball speeds occur in the circumferential direction. Due to the relative movement, not only is the intake volume between the grinding plates and the balls or rows of balls near the drum increased, but also the intake capacity of the entire ball bed. The crushing effect is increased so that optimal pressure, preferably all-round pressure, is exerted on the ground material by returning the balls to their closest packing.
  • the depth of the grooves changes in relation to the surface or base of the grinding plates or in relation to the inner wall of the drum.
  • the surface areas of the grinding plates lying between the grooves thus lie on a cylindrical surface opposite to which the bottom of the grooves approaches or moves away with variable depth.
  • balls or rows of balls or layers of balls with a radially constant position are circulated between balls or rows of balls or layers of balls which are raised and lowered. This results in an orderly relative movement. It is useful to lift balls only over partial areas of the circumferential extent of the ball bed so that there is a relative movement of balls that are in a circumferential groove to balls that are in an adjacent one Are circumferential groove, can form. According to the invention it is provided that groove areas with varying depths are arranged offset in relation to one another in the circumferential direction of the drum in the case of grooves of variable depth which follow one another in the longitudinal direction of the drum, in order not to obtain a rectified movement of the balls in adjacent groove areas.
  • grooves of variable depth are arranged alternately, in particular regularly alternating, with grooves of constant depth in the longitudinal direction of the drum.
  • a row of balls or a layer of balls with balls is provided between two rows or layers of balls, which perform an up and down movement, which maintain their position.
  • the grinding effect is increased if the balls or rows of balls or ball layers are raised or lowered several times in the course of a drum revolution.
  • the raising or lowering can either be steady or continuous or abrupt. According to the invention it is provided that the depth of the grooves from the surface of the grinding plates when entering until reaching the intended groove depth or from the intended groove depth to the outlet into the surface of the grinding plates substantially continuously or uniformly or increases, or that the inlet or initial name rich of grooves of variable depth is formed as an abrupt, preferably vertical, drop from the surface of the grinding plate to the bottom of the groove.
  • the grooves run around themselves in the circumferential direction or run in the form of helical lines around the drum axis.
  • the grinding plates can be arranged in such a way that grinding plates with grooves of constant depth and grinding plates with outlets and / or inlets or wastes, preferably in regular succession, are attached along the circumference of the drum.
  • the radius of the grooves in the tapering or running-in groove area corresponds to the radius of the grooves of constant depth
  • the radius of the grooves is thus consistently constant
  • Flattened webs are advantageously provided between the grooves, and the spacing of the grooves is selected such that a hexagonally closest ball packing is produced in grooves or groove areas of constant depth.
  • Pointed intermediate webs which are heavily worn during grinding, should be avoided. These ridges are widened in the groove inlets and outlets; However, the radius of the grooves for the balls remains the same, so that the distance or the mutual position of the balls in the longitudinal direction of the drum remains unchanged.
  • Fig. 1 shows the surface of grinding plates 1 and 1 ', as they can be installed inside a drum of a Kugelrohr mill.
  • grinding plates 1 ' shown, which correspond to conventional grinding plates and have circumferential grooves 2 with constant depth, the radius of the grooves 2 corresponding to the radius of the largest balls 6 used.
  • grinding plates 1 designed according to the invention are used between the known grinding plates or instead of them.
  • These grinding plates 1 have grooves or groove areas with varying depths. To form such grooves, groove areas with constant depth are followed by areas in which the groove depth decreases and then increases again to the constant depth.
  • a groove area 9 has a smaller groove depth and lifts it balls 6 running therein against balls running in adjacent grooves with constant depth.
  • the extent of the depth reduction, the number of reductions in a groove and the number of grooves with such a reduction on a grinding plate 1 are largely determined by the intended use.
  • Grooved areas with changing depth are advantageously realized by grooved areas which begin or end a groove 2, ie lead to the surface of the grinding plate 1; 2 shows groove inlets or outlets 3 or 3 ', in which the groove bottom is continuously or continuously in the direction of the surface of the grinding plate 1 or in the opposite of the web area 7 between grooves 2 with constant depth widened web area 7 'lifts; the areas either have the function of a groove inlet or groove outlet, depending on the possible direction of rotation of the grinding plate in a drum indicated by arrow 10.
  • Such groove areas with changing depth are alternately arranged with grooves of constant depth. These outlets or inlets 3, 3 'cause balls 6 which move along such grooves to rise and fall on their path.
  • FIG. 3 shows a grinding plate 1, in which a groove 2 is provided with an abrupt starting area 4.
  • the grinding plates 1 according to FIG. 3 can only be moved with the drum in the direction of arrow 8, since if the drum were rotated in the other direction, the balls would be taken away by the waste 4 and the grinding effect would be impaired.
  • Fig. 4 shows a row of grinding plates 1 according to the invention with outlets 3, which pass over an abrupt drop 11 into the next groove 2 with groove outlet 3.
  • the drum can turn according to arrow 8.
  • Fig. 4a shows the same grinding plates 1 as Fig. 4, but the upper grinding plate 1 is rotated by 180 °, so that in the joint area of the two grinding plates 1 there is a relative movement between the balls guided in adjacent grooves 2.
  • 4 and 4a cause a similar behavior of the balls 6 as the grinding plate 1 shown in Fig. 1, but the outlets 3 and the inlets 3 'are in the grinding plates according to FIGS. 4 and 4a on separate grinding plates 1st In this case the drum can turn according to arrow 10.
  • Fig. 7 shows a section through a groove of in a drum 13 along the drum circumference successively arranged grinding plates (1, 1 ', 1 ⁇ , 1 ⁇ ', 1 ' v ).
  • the grinding plates 1 ' have grooves 2 with a constant depth
  • the grinding plate 1 ⁇ ' has a groove reaching the surface
  • the grinding plate 1 has a groove region 9 with a modified groove depth, the bottom of the groove not reaching the surface of the grinding plate
  • the grinding plate 1 ⁇ having one the surface of the grinding plate reaching inlet 3 and a similar outlet 3 '.
  • the abrupt drop between the grinding plates 1 ⁇ 'and 1' is indicated by 11.
  • the grinding plate 1 ' v has an area 5 with increased depth of the groove.
  • FIG. 8 shows a perspective view of a grinding plate 1, in which continuous grooves 2 of constant depth, run-out areas 3 with a steady increase, a groove start 4 with an abrupt drop 11 and a groove with a groove area 9 with a reduced depth are shown.
  • the length of the areas with changed, ie increasing or decreasing, depth advantageously corresponds to a multiple, in particular 3-5 times, of a ball diameter of the balls used.
  • the ball bed can have balls with a predetermined diameter distribution.
  • the balls 6 are encompassed over their circumference by the grooves 2 over an angle of 90 °.
  • Fig. 9 shows a grinding plate 1 ⁇ 'with two grooves 2 constant depth and a groove outlet 3'.
  • the balls are denoted by 6 and it can be seen that the balls 6 take up a hexagonally closest ball packing; the spacing of the grooves 2 are chosen so that this pack is achieved.
  • Fig. 10 shows a view along the line B-B in Fig. 9 and it can be seen that the middle ball, which is located in the groove outlet 3 ', is raised.
  • Fig. 11 shows a grinding plate 1 ⁇ ', which has two groove outlets 3' and a groove 2.
  • the grinding plates according to FIGS. 9 and 11 can advantageously be arranged in succession, so that the balls are lifted in each groove at a distance of the length of two grinding plates. Since a grinding plate is 100 mm long, it is lifted every 200 mm.
  • Fig. 12 shows a section through a groove of a grinding plate 1 ⁇ 'according to Fig. 9 and 11. It can be seen similar to Fig. 7, the course of the groove outlet 3'.
  • FIG. 13 shows a diagram of a ball mill (two-chamber mill) and FIG. 14 shows a grinding diagram of this mill.
  • the grinding diagram of a well-regulated mill the surface created in the fine grinding area is shown as an ascending straight line, whereas in the coarse grinding area 13 this increase occurs only gradually. This means that hardly any shredding work is done on the first stretch of the grinding track. In this area, the cataract movement should be increased as required.
  • the critical grinding zone 13 of chamber I the material fed is not drawn in sufficiently, so that the The grinding effect is low, as curves 14 and 15 show in this area. According to the invention, an improvement is achieved in this area 13, as is illustrated by curve 16.
  • cement clinker was ground with an initial grain size of 0-30 mm.
  • the ball bed in chamber I with balls with a diameter of 100-60 mm had an active grinding surface of about 10 m2 / t.
  • the crushing was carried out to 50% sieve residue on a 90 ⁇ m sieve (4,900 meshes / cm2). It was found that the grinding capacity of the mill increased by 18%.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
EP88890208A 1987-08-20 1988-08-12 Procédé de broyage pour broyeur-tambour à billes, broyeur-tambour à billes et revêtement pour broyeur Withdrawn EP0304414A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT2084/87 1987-08-20
AT208487A AT393234B (de) 1987-08-20 1987-08-20 Mahlverfahren fuer kugelrohrmuehlen, kugelrohrmuehle und mahlplatte

Publications (2)

Publication Number Publication Date
EP0304414A2 true EP0304414A2 (fr) 1989-02-22
EP0304414A3 EP0304414A3 (fr) 1990-01-31

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ID=3527416

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Application Number Title Priority Date Filing Date
EP88890208A Withdrawn EP0304414A3 (fr) 1987-08-20 1988-08-12 Procédé de broyage pour broyeur-tambour à billes, broyeur-tambour à billes et revêtement pour broyeur

Country Status (2)

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EP (1) EP0304414A3 (fr)
AT (1) AT393234B (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4023616A1 (de) * 1989-09-15 1991-03-28 Zementanlagen Und Maschinenbau Innenauskleidung fuer rohrkugelmuehlen
DE4023624A1 (de) * 1989-09-15 1991-03-28 Zementanlagen Und Maschinenbau Rohrkugelmuehlen zur effektiven desagglomeration und zerkleinerung von hochdruckzerkleinertem sproeden material

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1161110B (de) * 1956-01-09 1964-01-09 Kloeckner Werke Ag Auskleidung fuer Rohrmuehlen
AT283092B (de) * 1965-04-08 1970-07-27 Boehler & Co Ag Geb Innenauskleidung von Kugelmühlen
BE736421A (fr) * 1969-07-22 1969-12-31
DD154425A3 (de) * 1980-02-22 1982-03-24 Paul Clemens Innenauskleidung von rohrkugelmuehlen
DD228957A3 (de) * 1982-11-01 1985-10-23 Ruedersdorf Zementwerke Innenauskleidung fuer rohrkugelmuehlen
AT379762B (de) * 1984-05-10 1986-02-25 Voest Alpine Ag Innenauskleidung fuer kugelmuehlen
AT380411B (de) * 1984-10-15 1986-05-26 Voest Alpine Ag Kugelmuehle
SU1258475A1 (ru) * 1985-04-26 1986-09-23 Днепропетровский Ордена Трудового Красного Знамени Горный Институт Им.Артема Бронефутеровка барабанной мельницы

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4023616A1 (de) * 1989-09-15 1991-03-28 Zementanlagen Und Maschinenbau Innenauskleidung fuer rohrkugelmuehlen
DE4023624A1 (de) * 1989-09-15 1991-03-28 Zementanlagen Und Maschinenbau Rohrkugelmuehlen zur effektiven desagglomeration und zerkleinerung von hochdruckzerkleinertem sproeden material

Also Published As

Publication number Publication date
AT393234B (de) 1991-09-10
EP0304414A3 (fr) 1990-01-31
ATA208487A (de) 1990-07-15

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