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WO1993025310A1 - Broyeur et son materiau de garniture utilise pour ce broyeur - Google Patents

Broyeur et son materiau de garniture utilise pour ce broyeur Download PDF

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Publication number
WO1993025310A1
WO1993025310A1 PCT/AU1993/000130 AU9300130W WO9325310A1 WO 1993025310 A1 WO1993025310 A1 WO 1993025310A1 AU 9300130 W AU9300130 W AU 9300130W WO 9325310 A1 WO9325310 A1 WO 9325310A1
Authority
WO
WIPO (PCT)
Prior art keywords
lining
grinding mill
balls
ball
mill according
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.)
Ceased
Application number
PCT/AU1993/000130
Other languages
English (en)
Inventor
Brian Raymond Hudson
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.)
TRELLEX Pty Ltd
Original Assignee
TRELLEX Pty Ltd
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 TRELLEX Pty Ltd filed Critical TRELLEX Pty Ltd
Priority to AU37416/93A priority Critical patent/AU656072B2/en
Publication of WO1993025310A1 publication Critical patent/WO1993025310A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • B02C17/225—Lining for containers using rubber or elastomeric material

Definitions

  • This invention relates generally to grinding mills and to lining media for such mills.
  • Rotary grinding mills are widely used for size reduction in various industries.
  • Typical types of rotary grinding mills are ball and semi-autogenous mills, in which a rotating drum drives a contained ball charge for effecting comminution of the material being treated.
  • Semi-autogenous grinding relies on a combination of balls and large particles of ore to effect comminution of the material being ground.
  • the speed of the grinding mill is increased then a proportionate increase in power is drawn from the drive motor, allowing a greater tonnage of feed material to be ground down to the desired product size.
  • the balls are generally steel and the annular lining is often formed of circumferentially alternate replaceable -" ⁇ mponents respectively known as shell plates and lifter bars.
  • the shell plates are commonly formed in an elastomeric rubber having a high impact resistance, while the lifter bars are formed wholly in such material or are themselves capped with a wear-resistant insert of metal, cemented carbide or ceramic. Examples of the latter construction are shown, for example, in Australian patent applications 23435/70 and 79998/87.
  • the lifter bars are designed to protrude above the level of the shell plates to provide the grip necessary to transmit the motor power to the ball charge in the mill.
  • US patent 3607606 to Beninga is concerned generally with composite rubber/ ceramic wear-resistant linings.
  • This patent shows, in Figures 6 and 7, a lining for truck beds used to carry rocks or the like, in which an array of alumina-based ceramic spheres are embedded in an elastomeric substrate.
  • This patent also shows a lining for a ball mill in Figures 8 to 9 in which square ceramic bodies are embedded in the rubber substrate but do not protrude therefrom, apart from occasional elongate ceramic bodies which serve as lifter bars.
  • US patent 4162900 to Judd discloses a wear-resistant composition in which a plurality of abrasive-resistant bodies are embedded within an elastomeric substrate.
  • Figure 4 depicts the situation in which these bodies are exposed after wearing down of the substrate in use.
  • the bodies are generally of elongate configuration.
  • a grinding mill especially a ball mill or SAG mill
  • improved performance of a grinding mill can be achieved by, in general, providing a lining in which a multiplicity of at least partially spherical wear-resistant bodies protrude from an elastomeric substrate, eg of rubber or polyurethane plastics material.
  • these bodies are balls of a material of similar hardness or harder than, and preferably similar material to, the ball charge.
  • the invention provides a grinding mill comprising a rotatable drum with an internal lining comprising an impact absorbent substrate and having an inwardly facing working surface, and a ball charge for the interior of said drum, wherein said lining arther includes an array of wear-resistant bodies of a hardness similar to or greater than the hardness of the ball charge, which bodies are embedded in the substrate and protrude from said working surface, said bodies defining part-spherical impact surface portions above said working surface.
  • the invention provides a lining medium for a grinding mill comprising an impact absorbent substrate having a working surface and an array of wear-resistant bodies which are embedded in and protrude from said surface, said bodies presenting respective part-spherical impact surface portions above said working surface.
  • the invention provides a grinding mill comprising a rotatable drum with an internal lining comprising an impact absorbent substrate and having an inwardly facing working surface, wherein said lining further includes an array of wear-resistant bodies which are embedded in and protrude from said surface, said bodies presenting respective part-spherical impact surface portions above said working surf ace.
  • the embedded wear-resistant bodies are preferably balls, which may conveniently have diameters of similar order to the balls of the ball charge.
  • the embedded balls are of similar construction to those of the ball charge.
  • the lining medium is preferably a shell plate or lifter for a ball mill and preferably includes provision for replaceably attaching the medium on the interior surface of a drum of a ball mill.
  • the lining of the mill preferably comprises an annular array of lining segments replaceably mounted to the drum. In one embodiment, these segments are of substantially uniform height inwardly from said wall, or at least the top surfaces of the segments are flush, ie there is no alteration of height from one segment to another. In this embodiment, there are therefore no lifter bars in the conventional sense and the arrangement relies on the embedded bodies to drive the ball charge. In an alternative embodiment, providing both shell plates and lifter bars, the embedded bodies may be provided in both the shell plates and lifter bars.
  • Figure 1 is a cross-section of a small segment of the drum of a ball mill in accordance with a first embodiment of the invention
  • Figure 2 depicts the shape of the ball charge when the mill is rotated at various speeds with different designs of liners
  • Figure 3 is a similar view to Figure 1 but showing a second embodiment of the invention.
  • Figures 4 and 5 are views similar to Figures 1 and 3 but respectively showing third and fourth embodiments of the invention.
  • Figure 1 shows part of a ball mill 10 having a drum 12, an internal lining 14 of a suitable impact absorbent elastomeric rubber or polyurethane plastics material, and a charge 16 of steel balls.
  • Means (not shown) is provided to mount this drum for rotation and to rotatably drive the drum.
  • the drum may include a thin secondary rubber liner 12a under lining 14.
  • Lining 14 is essentially made up of axially extending substrate segments 22, 24 of two configurations which alternate circumferentially. Segments 22 correspond to the shell plates of conventional ball mills and have circumferentially extending base flange elements 26 which project under and are held in place by the other lining segments 24. Lining segments 24 occupy the location in conventional mills of the lifter bars, and are mounted to the drum wall in a similar fashion. Underlying metal inserts 28 vulcanised into the rubber retain the heads 29 of threaded studs 30 which project through apertures in the drum 12 and through rubber bushes 32 lining holes drilled in drum 12. These studs 30 are fastened by nuts 34 acting against external thrust washer assemblies 36.
  • Lining segments 22, 24 define inwardly facing flush working surfaces 40.
  • Embedded in and protruding from surfaces 40 is a uniform two-dimensional array of wear-resistant bodies in the form of steel balls 42.
  • Balls 42 may be selected from commercially available steel balls normally employed for ball mill charges, and may be forged or cast steel balls. In other embodiments, cast iron balls may be employed.
  • Balls 17, 42 may be geometrically similar, eg spherical, and may be of like diameter but this is not necessary.
  • the balls 42 are vulcanised into the rubber of lining segments 22, 24 so that they protrude from working surfaces 40 to define part-spherical impact surface portions 43, at a height above working surfaces 40 less than half a ball diameter, preferably between a half and a quarter of a ball radius.
  • a common ball size used in ball mills is 50 mm and thus a typical height of protrusion would be between 12.5 and 25 mm.
  • the array of embedded balls is preferably so arranged in relation to protruding height and centre-to-centre separation of the balls, that a ball 17 of the ball charge neatly fits between adjacent embedded balls in contact with or almost in contact with surface 40 and/or the adjacent balls.
  • This condition is illustrated in Figure 1 and is optimised if the balls are arranged in rows extending circumferentially of the drum.
  • the array may be a simple square array or each alternate row may be offset from the adjacent rows by, for example, half a centre-to- centre spacing. It will be appreciated that the balls adjacent the edges of lining segments 22,
  • Figure 2A shows the application of the configuration of Figure 1 to a grinding mill designed to operate at higher rotational speeds than conventionally possible.
  • the grip is achieved with the multiplicity of part-spherical protrusions provided by the embedded balls. It is found that the mill can be rotated at considerably higher speeds than were possible with conventional lifters, without creating excessive turbulence, and without cataracting the ball charge, both of which result in inefficient grinding. This is due to the shape of the part-spherical protrusion: while providing the required transmission of power, it allows the outermost layer of balls to be released far earlier from contact with the lining, limiting the resultant throw to the toe 45 of the ball charge.
  • Figure 2B and 2C depict the shape of the ball charge for conventional rubber linings respectively operating at 75% critical speed and at 80% critical speed while maintaining the shell plate to lifter height at 4:1.
  • Figure 2B demonstrates the behaviour of the ball charge at the maximum speed obtainable with the conventional mill
  • Figure 2C shows how, at high speeds, the ball charge drops behind its toe, causing direct impact on the rubber lining.
  • Figure 1 is intended to operate at 85% critical speed and above.
  • Figure 3 depicts an alternative embodiment designed to operate at intermediate speeds such as 75% to 80% critical.
  • the lining segments 24' have an inclined working surface 41a and thereby project above the adjacent lining segment 22' at one end to effectively serve as lifter bars.
  • This configuration is thus nearer the conventional in that the lining segments 22' and 24' are in essence respectively shell plates and lifter bars.
  • the embedded balls 42' are arranged in a similar array and provided in both shell plates and lifter bars.
  • FIG. 4 A further embodiment is depicted in Figure 4 in which the lining segments 24" are still more pronounced lifter bars having a flat top face 41b, an inclined forward face 41c and a normal rear face 41 d.
  • the embedded balls 42" are provided in both the top and forward faces of the lifter bars as well as in the shell plates 22".
  • each lining segment 24'" is formed integrally with a lining segment 22'", so that only one type of lining segment is provided.
  • Figure 5 also shows a quite different wear surface shape to suit particular grinding conditions in the mill.
  • the use for the embedded balls 42 of balls conventionally employed as charge balls has two advantages. Firstly, there is the simple matter of readily available supply and therefore economy of construction. Secondly, if and when a spherical ball finally parts company with the elastomeric substrate of the liner as the liner is worn away, the ball simply becomes an additional component of the ball charge. This situation is in sharp contrast to the experience with existing lifter bar caps of metal, ceramics and cemented carbides.
  • Such caps are of large mass and weight and are known to frequently detach themselves from the elastomeric underlay, especially after some period of service. These large irregularly shaped lumps of metal, rotating freely in the mill, can result in substantial damage to more vulnerable components and, due to their irregular shape, also have a detrimental effect on the grinding efficiency of the mill.
  • the provision of embedded wear-resistant balls is also preferred over lifter bar caps and inserts because the latter are typically heavy and difficult to handle.
  • the invention is applicable to any grinding mills in which there is a ball charge in the interior of the drum.
  • Such mills include the aforementioned SAG mills as well as ball mills.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)

Abstract

Un broyeur comporte un tambour rotatif (12) équipé d'une garniture intérieure et d'une charge de billes (16) à l'intérieur du tambour. La garniture comprend un substrat absorbant (14) les chocs et elle possède une surface de travail (40) dirigée vers l'intérieur. La garniture comprend de plus un réseau de pièces (42) résistant à l'usure d'une dureté similaire ou supérieure à celle de la charge de billes; ces pièces sont logées dans le substrat et elles font saillie par rapport à la surface de travail. Les pièces résistant à l'usure définissent des surfaces d'impact sphériques (41) au-dessus de la surface de travail.
PCT/AU1993/000130 1992-06-18 1993-03-30 Broyeur et son materiau de garniture utilise pour ce broyeur Ceased WO1993025310A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU37416/93A AU656072B2 (en) 1992-06-18 1993-03-30 Grinding mill

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AUPL302792 1992-06-18
AUPL3027 1992-06-18

Publications (1)

Publication Number Publication Date
WO1993025310A1 true WO1993025310A1 (fr) 1993-12-23

Family

ID=3776230

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AU1993/000130 Ceased WO1993025310A1 (fr) 1992-06-18 1993-03-30 Broyeur et son materiau de garniture utilise pour ce broyeur

Country Status (1)

Country Link
WO (1) WO1993025310A1 (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19847920A1 (de) * 1998-10-19 2000-04-20 Siegfried Pagenstecher Fa Auskleidung für Kugelmühlen und ähnliche Mahlaggregate
US6510729B2 (en) * 2000-11-06 2003-01-28 Magotteaux International Device for determining the corrosion of the grinding bodies in a rotary mill
RU2199395C2 (ru) * 2001-05-07 2003-02-27 Открытое акционерное общество "ТЯЖМАШ" Способ изготовления мельниц для размола материалов природного шельфа
BG64977B1 (bg) * 2003-04-01 2006-11-30 Радослав ДИМИТРОВ Облицовка на топкови мелници за мокро смилане
CN106391223A (zh) * 2016-10-31 2017-02-15 天津鹰麟节能科技发展有限公司 一种湿式球磨机衬板结构
WO2019139222A1 (fr) * 2018-01-10 2019-07-18 윤병원 Dispositif de production pour obtenir un agrégat recyclé satisfaisant une norme de recyclage de déchets de construction et son procédé de production
GB2589922A (en) * 2019-12-13 2021-06-16 Vulco Sa Liner for a grinding mill
CN113073319A (zh) * 2021-04-07 2021-07-06 重庆科技学院 一种球磨罐内壁硬化方法及球磨罐

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB298899A (en) * 1927-10-15 1929-01-24 Swinfen Bramley Moore Improvements in linings for grinding, refining and mixing machines
US2193956A (en) * 1938-10-10 1940-03-19 Charles J Abrams Liner for ball mills
AU3205150A (en) * 1950-01-13 1950-03-16 Societe Anonyme Usines Emile Henricus Ball-mill
FR1140441A (fr) * 1954-11-26 1957-07-22 Magotteaux Fond Revêtement pour broyeurs rotatifs à boulets, barres broyantes et autres corps broyants
AU1247270A (en) * 1970-03-12 1971-09-16 Coors Porcelain Company Ceramic-rubber composites
SU679240A1 (ru) * 1977-05-23 1979-08-15 Всесоюзный научно-исследовательский проектно-конструкторский технологический институт механизации труда в черной металлургии и ремонтно-механических работ Футеровка дл шаровых мельниц
US4583575A (en) * 1983-09-30 1986-04-22 Skega Ab Wear means for drum barker

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB298899A (en) * 1927-10-15 1929-01-24 Swinfen Bramley Moore Improvements in linings for grinding, refining and mixing machines
US2193956A (en) * 1938-10-10 1940-03-19 Charles J Abrams Liner for ball mills
AU3205150A (en) * 1950-01-13 1950-03-16 Societe Anonyme Usines Emile Henricus Ball-mill
FR1140441A (fr) * 1954-11-26 1957-07-22 Magotteaux Fond Revêtement pour broyeurs rotatifs à boulets, barres broyantes et autres corps broyants
AU1247270A (en) * 1970-03-12 1971-09-16 Coors Porcelain Company Ceramic-rubber composites
SU679240A1 (ru) * 1977-05-23 1979-08-15 Всесоюзный научно-исследовательский проектно-конструкторский технологический институт механизации труда в черной металлургии и ремонтно-механических работ Футеровка дл шаровых мельниц
US4583575A (en) * 1983-09-30 1986-04-22 Skega Ab Wear means for drum barker

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
DERWENT ABSTRACT, Accession No. D5689C/16, Class P41; & SU,A,679 240, (FERR METAL LAB MECH.), 15 August 1979. *

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19847920A1 (de) * 1998-10-19 2000-04-20 Siegfried Pagenstecher Fa Auskleidung für Kugelmühlen und ähnliche Mahlaggregate
DE19847920C2 (de) * 1998-10-19 2002-02-21 Siegfried Pagenstecher Fa Auskleidung für Kugelmühlen und ähnliche Mahlaggregate
US6510729B2 (en) * 2000-11-06 2003-01-28 Magotteaux International Device for determining the corrosion of the grinding bodies in a rotary mill
RU2199395C2 (ru) * 2001-05-07 2003-02-27 Открытое акционерное общество "ТЯЖМАШ" Способ изготовления мельниц для размола материалов природного шельфа
BG64977B1 (bg) * 2003-04-01 2006-11-30 Радослав ДИМИТРОВ Облицовка на топкови мелници за мокро смилане
CN106391223A (zh) * 2016-10-31 2017-02-15 天津鹰麟节能科技发展有限公司 一种湿式球磨机衬板结构
WO2019139222A1 (fr) * 2018-01-10 2019-07-18 윤병원 Dispositif de production pour obtenir un agrégat recyclé satisfaisant une norme de recyclage de déchets de construction et son procédé de production
CN110248742A (zh) * 2018-01-10 2019-09-17 尹炳洹 用于获得满足建筑垃圾再利用基准的循环骨料的生产装置及生产方法
GB2589922A (en) * 2019-12-13 2021-06-16 Vulco Sa Liner for a grinding mill
CN113073319A (zh) * 2021-04-07 2021-07-06 重庆科技学院 一种球磨罐内壁硬化方法及球磨罐

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