EP0319579B1 - Broyeur tubulaire a boulets - Google Patents

Broyeur tubulaire a boulets Download PDF

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Publication number
EP0319579B1
EP0319579B1 EP87902864A EP87902864A EP0319579B1 EP 0319579 B1 EP0319579 B1 EP 0319579B1 EP 87902864 A EP87902864 A EP 87902864A EP 87902864 A EP87902864 A EP 87902864A EP 0319579 B1 EP0319579 B1 EP 0319579B1
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EP
European Patent Office
Prior art keywords
annular
housing
angle
partitions
casing
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.)
Expired - Lifetime
Application number
EP87902864A
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German (de)
English (en)
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EP0319579A1 (fr
EP0319579A4 (fr
Inventor
Vasily Stepanovich Bogdanov
Ivan Ivanovich Miroshnichenko
Nikolai Stepanovich Bodganov
Nikolai Dmitrievich Vorobiev
Vladimir Zelmonovich Pirotsky
Ivan Nikolaevich Shevchenko
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.)
Belgorodsky Tekhnologichesky Institut Stroitelnykh Materialov Imeni Iagrishmanova
Original Assignee
Belgorodsky Tekhnologichesky Institut Stroitelnykh Materialov Imeni Iagrishmanova
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Application filed by Belgorodsky Tekhnologichesky Institut Stroitelnykh Materialov Imeni Iagrishmanova filed Critical Belgorodsky Tekhnologichesky Institut Stroitelnykh Materialov Imeni Iagrishmanova
Publication of EP0319579A1 publication Critical patent/EP0319579A1/fr
Publication of EP0319579A4 publication Critical patent/EP0319579A4/fr
Application granted granted Critical
Publication of EP0319579B1 publication Critical patent/EP0319579B1/fr
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    • 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
    • B02C17/04—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 with unperforated container
    • B02C17/06—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 with unperforated container with several compartments

Definitions

  • the present invention relates to devices for comminuting solid materials, in particular to ball tube mills.
  • a ball tube mill which contains a housing which has an inlet and an outlet for the material to be comminuted and in the interior of which a perforated intermediate wall is arranged which divides its interior into coarse and fine grinding chambers.
  • annular partition walls are arranged with a predetermined step, which are perpendicular to the longitudinal axis of the housing. Some of these partitions have a smaller inner diameter and are perforated.
  • the other partitions which have a larger inner diameter, are designed without perforation, i.e. they are full-walled.
  • the perforated and the non-perforated annular partitions are arranged alternately.
  • There is a perforated grate in the housing in front of the outlet opening see e.g. copyright certificate No. 1024101, issued in the USSR and published in the bulletin "Discoveries, Inventions, Designs, Trademarks", No. 23 of June 23, 1983).
  • the annular partitions enable the quality of the finished product to be increased, but they do not influence the movement character (the mode of operation) of the grinding media.
  • the grinding media which are located in the mill housing between the ring-shaped partition walls, only move in the mill housing cross section and rise to an angle of 35 °, whereby they mainly crush the ground material particles by means of blows.
  • the grinding media located in the central part of the entry contour form standstill zones and do not participate in the comminution process, which reduces the overall grinding efficiency.
  • annular partitions Swell and create a jam which reduces the longitudinal movement speed of regrind particles through the mill housing from the entrance to the exit.
  • the dwell time of the particles in the mill housing increases, which leads to excessive comminution of regrind particles, reduction in the throughput of the mills, adhesion of the regrind to grinding media and discharge.
  • a Kugelrohr mill is known with an annular partition, which is attached at an angle to the longitudinal axis of the housing and has an elliptical shape.
  • the invention has for its object to provide a ball tube mill in which the annular partitions would have such a design that it would run to increase the grinding efficiency of solid materials by rational energy distribution of grinding media located in the mill housing.
  • annular partition walls are arranged in succession with a predetermined step, according to the invention the annular partition walls are attached at an angle to the housing axis and have an elliptical shape, while the step between adjacent annular partition walls is somewhat larger than D / tg ⁇ , where D is the housing inner diameter and ⁇ is the angle of inclination of the ring-shaped partition wall to the housing longitudinal axis.
  • the annular partitions are expediently arranged at an angle of 45-65 ° to the longitudinal axis of the housing.
  • the inner diameter of the annular partition walls increases exponentially in the direction of movement of the ground material in the housing from its entry to the exit.
  • annular partition walls ensures a highly efficient energy distribution of grinding media along the mill housing.
  • each annular partition should have a shortened length along the large ellipse axis, which is 0.3-0.5 of the housing diameter, and a flat forehead that is parallel to the small ellipse axis, with adjacent annular partition walls being offset by an angle of 180 ° to be arranged relative to each other.
  • This design of the ring-shaped partitions intensifies the transverse-longitudinal movement of grinding media, which obtain the greatest possible energy, which increases the grinding efficiency of materials that can be ground.
  • the annular partition walls are offset relative to one another along the axes of the same name by an angle of 90 °.
  • annular partition walls ensures a uniform intensification of the grinding media movement with each revolution of the mill housing.
  • the spherical tube mill designed according to the present invention significantly intensifies the grinding media work thanks to the longitudinal movement of the grinding media, the standstill zones in the central entry area are destroyed, the throughput speed of the grinding material particles through the mill increases, an efficient energy distribution of the grinding media along the mill housing is ensured in accordance with the pulverization conditions. This increases the overall grinding efficiency.
  • the ball tube mill contains a housing 1 (FIG. 1), which is closed at the end by cover 2. Through holes (not shown) - inlet and outlet - are provided in these lids for the entry and exit of a material to be comminuted from the mill.
  • annular partition walls 4, 5, 6, 7 are arranged in succession at an angle ⁇ to the longitudinal axis 3, which can be perforated as well as full-walled. These partitions are attached with a step l from each other.
  • the step l between two adjacent partitions 4, 5; 5, 6; 6, 7 must be slightly larger than D / tg ⁇ , where D means the inside diameter of the housing 1 and ⁇ the angle of inclination of the annular partitions 4, 5, 6, 7 to the axis 3 of the housing 1.
  • the angle of inclination ⁇ of the annular partitions 4, 5, 6, 7 to the longitudinal axis 3 of the housing 1 should be within 45-65 °.
  • the size of the angle is selected depending on the physical-mechanical properties (grindability) of the regrind particles. A smaller angle ⁇ is used for materials that are difficult to grind, and a larger angle ⁇ for materials that are easy to grind.
  • the particles have a size Above 1 mm most effectively crushed, those less than 1 mm in size but most effectively crushed. It has been proven that the regrind particles with a size greater than 1 mm can practically not be crushed by grinding in a ball tube mill.
  • a predominantly striking operating state (waterfall operation) of the grinding media I.e. a striking comminution of coarser regrind fractions.
  • the respective height h 1, h 2 of the annular partitions 4, 5 must be such that they would lift the greatest possible mass of grinding media, i.e. the height h 1 of the annular partition 4 must be greater than the height h 2 of the annular partition 5 (h 1> h 2).
  • the impact energy of the grinding media should also decrease.
  • the comminution of the regrind particles with a size of less than 200 ⁇ m should expediently be done by grinding.
  • the height h of the annular partitions 4, 5, 6, 7 increases along the longitudinal axis 3 of the housing 1 according to the relationship also exponentially from where h i , h i + 1 the height of a previous and a subsequent annular partition, 1 the distance between two adjacent annular partition walls (step), b, n the parameters which depend on the grindability of the material to be milled, which result from the Rosin-Rammler relationship.
  • the ring-shaped partitions 4, 5, 6, 7 of Fig. 1 are arranged such that their small and large ellipse axes are parallel to each other.
  • the annular partitions 4, 5, 6, 7 are offset in succession along the elliptical axes of the same name by an angle of 90 °, which makes it possible to intensify the movement of the grinding media uniformly with each revolution of the mill housing.
  • a perforated grate 13 is fitted in the housing 1 on the outlet side, which prevents coarser ground material particles and grinding media from escaping from the mill.
  • each annular intermediate wall 14 (FIG. 3), 15, 16, 17 along the major axis 18 (FIG. 4) of the ellipse has a shortened length S, which 0.3-0.6 of D, where D means the inside diameter of the housing 1.
  • D means the inside diameter of the housing 1.
  • the forehead 19 of the annular partition walls 14, 15, 16, 17 is flat and parallel to the small axis 20 of the ellipse.
  • the adjacent annular partitions 14, 15, 16, 17 are offset by 180 ° relative to one another.
  • This design of the annular partition walls ensures an avalanche-like fall of the grinding media and creates conditions for impact and vibration comminution of the regrind particles in the falling zone of the grinding media. Selective comminution takes place, i.e. the largest particles are destroyed under the impact of impact, the smaller particles under the impact of vibration and friction. This ensures an efficient consumption of the grinding media energy for the destruction of differently sized regrind particles.
  • the Kugelrohr mill works as follows. Let us first analyze the function of one of the ring-shaped partitions, for example the ring-shaped partition 4. The function of the other ring-shaped partitions 5, 6, 7 is similar.
  • the annular partition 4 scoops with its surface the grinding media in zones 8 and 9, lifts them up by an angle of 80-90 ° and throws them avalanche-like in zone 8 on the end cover 2, in the zone 9 but from the foot of the annular partition 5, whereby the ground material is crushed.
  • the angle of rise of the grinding elements increases from 35 ° to 90 °. This increases the total energy (potential and kinetic energy) of the grinding media. So to ensure an equal amount of shredding, i.e. an equal mill output when using inclined annular partitions, a smaller number of grinding media is required, and since the power absorbed by the mill is directly proportional to the mass of the rotating parts (mill drum, lining, grinding media, regrind), their reduction also increases the Power consumption reduced.
  • annular partitions 4, 5, 6, 7 swirl the movement of the grinding media with respect to the transverse and longitudinal axes of the housing 1, as a result of which the standstill zones in the central part of the transverse entry contour are destroyed and the grinding efficiency is increased.
  • the grinding efficiency is greatest.
  • ⁇ of the annular Partitions a mass of grinding bodies contained in the mill housing 1 of 166 kg
  • the work output of a laboratory mill was 23 kg / h
  • the grinding fineness 310 m2 / kg the power consumption 1.98 kW.
  • the mill output was 23.2 kg / h
  • the power consumption 1.92 kW the fineness 325 m2 / kg.
  • the mill output decreases to 17.3 kg / h
  • the power consumption increases to 2.15 kW
  • the grinding fineness of cement decreases to 290 m2 / kg.
  • the work output of a laboratory mill is then 20.0 kg / h, the power consumption 1.9 kW, the fineness 315 m2 / kg.
  • the comminution process is therefore most effectively carried out at an angle of inclination ⁇ of the annular intermediate walls 4, 5, 6, 7 to the longitudinal axis 3 of the housing 1 of 45-65 °.
  • the height h of the annular partitions 4, 5, 6, 7 increases exponentially along the longitudinal axis 3 of the housing 1 from.
  • annular partitions 4, 5, 6, 7 are arranged according to a diagram shown in FIG. 1.
  • the annular intermediate walls 4, 5, 6, 7 are attached parallel to one another, and their elliptical axes of the same name lie parallel to one another.
  • a waterfall-like operating state for the grinding media i.e. a striking comminution of coarser regrind particles can be created.
  • the height of the annular partition walls 4, 5 must be such that they would lift the largest possible mass of grinding media, i.e. the height h 1 of the annular partition 4 must be greater than the height h 2 of the annular partition 5.
  • the ring-shaped partitions 4, 5, 6, 7 in the respective zones 8, 9, 10, 11, 12 scoop up a grinding media mass which is proportional to the height h of each of the rings, raising them to a height, which corresponds to a separation angle of 85-90 °, and they throw off like an avalanche.
  • the highest impact energy of the grinding media on the material to be shredded is achieved in zones 8, 9, in which the annular partition 4 is arranged, which has the greatest height h 1.
  • the grinding media energy exponentially decreases, namely the impact energy of the grinding media in zone 12 is minimal, since the crushing by intensive transverse-longitudinal crushing predominates here.
  • annular partitions 4, 5, 6, 7 are offset according to the ellipse axes by an angle which is greater or less than 90 °, for example by an angle of 103 ° or 82 °, the assembly of annular partitions and the same touching lining (not shown in the drawing) difficult.
  • the cycles repeat and the shortened annular partition walls 14, 15, 16, 17 successively assume characteristic positions 14a, 15a, 16a, 17a.
  • the zone 21 formed between the shortened annular partition walls 15 and 17 will move toward the cover side 2 by an amount l 1 and assume a volume which is limited by the annular partition walls 14, 16 which occupy the position 14a, 16a.
  • the entire mass of grinding media and grinding stock moves along the longitudinal axis 3 of the housing 1 towards the entry side, the grinding stock being crushed intensively by grinding.
  • each of the shortened annular partitions 14, 15, 16, 17, for example when moving from the lower position 15 to the upper position 15a, creates a mass of grinding media with a volume V 1, which are located in zone 22, and throws them like an avalanche after the entry side (the lid 2) down, as well as a measure of grinding media with a volume V2, which are located in zone 21, and throws them to the opposite side (the discharge side), the material being crushed by intense avalanche-like blows becomes.
  • the annular intermediate walls 14, 16 each assume a lower position 14a, 16a, but the annular intermediate walls 15, 17 assume a respective upper position 15a, 17a.
  • the zones 21, 22 move along the longitudinal axis 3 of the housing 1 and return to the initial position, the entire mass of the grinding media present being displaced along the axis 3 towards the entry side.
  • the material is crushed under the influence of the grinding media, which perform a transverse-longitudinal movement.
  • the standstill zones in the central part of the transverse entry contour are destroyed, the grinding efficiency increases.
  • the grinding media function in a similar manner in each of the zones lying in a row, in each case in zones 21, 22 and in zones 23, 24.
  • the shortened design of the annular partitions 14, 15, 16, 17 makes it possible to increase their number in the housing 1.
  • the grinding media mass is reduced, the power consumption is reduced and at the same time the grinding efficiency is increased.
  • this invention can be used in the cement, mining, and other industries where it is necessary to finely comminute materials.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)

Abstract

Un broyeur tubulaire à boulets comporte une enveloppe pourvue d'une entrée et d'une sortie pour le matériau à broyer, dans laquelle des diaphragmes annulaires (4, 5, 6, 7) de forme éllipsoïdale sont montés selon un angle alpha par rapport à l'axe longitudinal (3) de ladite enveloppe (1). L'écartement entre les diaphgrames annulaires adjacents (4, 5; 5, 6; 6, 7) est légèrement supérieur à D/tgalpha où D est le diamètre intérieur de l'enveloppe, et alpha est l'angle d'inclinaison du diaphgrame annulaire (4, 5, 6, 7) par rapport à l'axe longitudinal (3) de l'enveloppe (1).

Claims (5)

1. Broyeur tubulaire à boulets dans l'enveloppe (1) duquel, qui possède une entrée et une sortie pour un produit à broyer, sont disposées successivement des cloisons annulaires (4, 5, 6, 7) avec un pas prédéterminé, caractérisé en ce que des cloisons annulaires (4, 5, 6, 7) sont montées sous un angle (α) par rapport à l'axe longitudinal (3) de l'enveloppe (1) et présentent une forme elliptique tandis que le pas (ℓ), entre deux cloisons annulaires voisines (4, 5; 5, 6; 6, 7) est un peu plus grand que D/tg α où D désigne le diamètre intérieur de l'enveloppe (1) et α l'angle d'inclinaison de la cloison annulaire (4, 5, 6, 7) par rapport à l'axe longitudinal (3) de l'enveloppe (1).
2. Broyeur tubulaire à boulets selon la revendication 1, caractérisé en ce que les cloisons annulaires (4, 5, 6, 7) sont montées sous un angle de 45-65° par rapport à l'axe longitudinal (3) de l'enveloppe (1).
3. Broyeur tubulaire à boulets selon la revendication 1, caractérisé en ce que le diamètre intérieur (d₁, d₂, d₃, d₄) des cloisons annulaires (4, 5, 6, 7) croît exponentiellement dans le sens du mouvement du produit de broyage dans l'enveloppe (1) depuis l'entrée jusqu'à la sortie de celle-ci.
4. Broyeur tubulaire à boulets selon la revendication 1, caractérisé en ce que les cloisons annulaires (4, 5, 6, 7) sont décalées d'un angle de 90° les unes relativement aux autres.
5. Broyeur tubulaire à boulets selon la revendication 1, caractérisé en ce que chaque cloison annulaire (14, 15, 16, 17) possède, le long du grand axe d'ellipse (18), une longueur raccourcie (S) qui est de 0,3-0,6 du diamètre (D) de l'enveloppe (1) et a un front plat qui est parallèle au petit axe d'ellipse (20), les cloisons annulaires voisines (14, 15, 16, 17) étant disposées avec un décalage d'un angle de 180° les unes relativement aux autres.
EP87902864A 1987-01-23 1987-01-23 Broyeur tubulaire a boulets Expired - Lifetime EP0319579B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/SU1987/000007 WO1988005341A1 (fr) 1987-01-23 1987-01-23 Broyeur tubulaire a boulets

Publications (3)

Publication Number Publication Date
EP0319579A1 EP0319579A1 (fr) 1989-06-14
EP0319579A4 EP0319579A4 (fr) 1989-10-12
EP0319579B1 true EP0319579B1 (fr) 1991-03-20

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ID=21617074

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87902864A Expired - Lifetime EP0319579B1 (fr) 1987-01-23 1987-01-23 Broyeur tubulaire a boulets

Country Status (6)

Country Link
US (1) US4917312A (fr)
EP (1) EP0319579B1 (fr)
JP (1) JPH01501848A (fr)
DE (1) DE3768816D1 (fr)
DK (1) DK524188A (fr)
WO (1) WO1988005341A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5595349A (en) * 1992-02-27 1997-01-21 Bergstrom; David A. Continuous flow rotary materials processing apparatus
US6880771B2 (en) * 2002-02-01 2005-04-19 Monsanto Technology Llc Axially reciprocating tubular ball mill grinding device and method
WO2012131998A1 (fr) * 2011-03-31 2012-10-04 有限会社大東土木 Broyeur
US20160030944A1 (en) * 2014-08-04 2016-02-04 General Electric Company Attritor
RU209381U1 (ru) * 2021-11-22 2022-03-15 Общество с ограниченной ответственностью "Объединенная Компания РУСАЛ Инженерно-технологический центр" Разгрузочная решетка барабанной мельницы
WO2024035901A1 (fr) * 2022-08-11 2024-02-15 Monsanto Technology Llc Systèmes de broyage et procédés de broyage d'échantillons

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU961761A1 (ru) * 1979-11-30 1982-09-30 Белгородский технологический институт строительных материалов им.И.А.Гришманова Межкамерна перегородка

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1683627A (en) * 1919-12-31 1928-09-11 Alexander M Read Pulverizing machine
CA909185A (en) * 1969-09-04 1972-09-05 Dominion Engineering Works Limited Autogenous mill system
US3624797A (en) * 1969-12-11 1971-11-30 Allis Chalmers Mfg Co Multiple compartment grinding mills
SU782864A1 (ru) * 1979-04-20 1980-11-30 Государственный Всесоюзный Научно-Исследовательский Институт Цементной Промышленности "Ниицемент" Трубна мельница
SU1024101A1 (ru) * 1982-01-22 1983-06-23 Государственный Всесоюзный Научно-Исследовательский Институт Цементной Промышленности Трубна мельница
EP0288565A4 (fr) * 1986-10-21 1989-10-04 Belgorodskij Ti Str Material Broyeur tubulaire a bille.
WO1988003056A1 (fr) * 1986-10-24 1988-05-05 Belgorodsky Tekhnologichesky Institut Stroitelnykh Broyeur tubulaire a bille
HU200288B (en) * 1986-11-14 1990-05-28 Belgorodskij Ti Str Material Deodorants, deodorant sheets, fi

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU961761A1 (ru) * 1979-11-30 1982-09-30 Белгородский технологический институт строительных материалов им.И.А.Гришманова Межкамерна перегородка

Also Published As

Publication number Publication date
EP0319579A1 (fr) 1989-06-14
EP0319579A4 (fr) 1989-10-12
DK524188A (da) 1988-11-23
DK524188D0 (da) 1988-09-21
JPH01501848A (ja) 1989-06-29
US4917312A (en) 1990-04-17
WO1988005341A1 (fr) 1988-07-28
DE3768816D1 (de) 1991-04-25

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