EP1448304B1 - Procede d'evaluation du taux de remplissage d'un broyeur rotatif tubulaire et dispositif pour sa mise en oeuvre - Google Patents

Procede d'evaluation du taux de remplissage d'un broyeur rotatif tubulaire et dispositif pour sa mise en oeuvre Download PDF

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Publication number
EP1448304B1
EP1448304B1 EP02803364A EP02803364A EP1448304B1 EP 1448304 B1 EP1448304 B1 EP 1448304B1 EP 02803364 A EP02803364 A EP 02803364A EP 02803364 A EP02803364 A EP 02803364A EP 1448304 B1 EP1448304 B1 EP 1448304B1
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EP
European Patent Office
Prior art keywords
mill
contents
pulp
angular positions
filling ratio
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Expired - Lifetime
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EP02803364A
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German (de)
English (en)
French (fr)
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EP1448304A1 (fr
Inventor
Bernard De Haas
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Magotteaux International SA
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Magotteaux International SA
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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
    • B02C17/18—Details
    • B02C17/1805—Monitoring devices for tumbling mills

Definitions

  • the present invention relates to a method for evaluating the filling rate of a tubular rotary mill comprising a cylindrical shell rotating about its longitudinal axis, the contents of which consist of a load of grinding gear of metal alloy and the material to grinding which forms the pulp inside the mill as it is ground, and occupies, during the rotation thereof and seen in the direction of rotation, essentially the fourth trigonometric quarter of the section of the mill. grinder while the foot of the contents extends into the third trigonometric quarter while the head is raised in the first trigonometric quarter.
  • the invention also relates to an advantageous device for implementing this method.
  • the invention is essentially mills type ball mills or bars, used in particular for grinding clinker, coal and or ores.
  • the optimum grinding conditions are achieved when the volume of the pulp corresponds approximately to the volume of the voids existing between the grinding machines or is slightly greater than this volume, without however exceeding it by 20%.
  • the volume of the pulp is too low, the grinding efficiency decreases and, above all, the grinding machines which are in contact with each other wear out one another.
  • the volume of the pulp is too great the grinding efficiency also decreases.
  • the knowledge of the amount of pulp in the mill makes it possible, therefore, to adjust the feed of the crusher in the most adequate way that is suitable for optimum operation of the crusher.
  • a first means consists in measuring the evolution of the power absorbed by the mill. This power absorbed by the grinder increases with the filling rate until reaching a maximum beyond which it begins to decrease, in particular because of the lesser influence of the unbalance.
  • the power curve has a very flat maximum, which greatly reduces the sensitivity of the measurement as soon as we approach this maximum. Such a method is described in: "Canadian Mineral Processors" Proceedings 1998, Paper No. 24 Ottawa, Ontario.
  • a second method consists in measuring the forces exerted on the shielding.
  • An instrumented shielding plate is placed in the shield and when it enters the load, the force exerted on the plate increases suddenly and decreases as it exits the load. This measure is only applicable in a mill equipped with a rubber shield and is very sensitive to the wear of the instrumented plate. Such a method is described in the patent WO93 / 00996 .
  • Another method is to measure the deformation of the ferrule of the mill as it undergoes radial and transverse deformations which are all the more important that the mill is filled.
  • the sensitivity of this measurement is reduced in the case of a low L / D ratio (mill length to diameter) and by any stiffening element such as an intermediate partition or a thick thickness of the ferrule or shield.
  • the principle of this measure is described in the article " Measuring System of the Mill Load in Grinding Ball Mill Circuits "by J. Kolacz-Mineral Engineering, Vol 10, No. 12, 1997 p 1329-1338 .
  • Another method is to measure the noise generated by the shocks between the grinding bodies and the shield of the mill.
  • This noise increases with the filling rate in grinding apparatus but, the material to grinding dampens shocks, the noise decreases when the material filling increases, hence inaccuracy of measurement.
  • microphones were used which are placed near the mill shell to pick up the noises.
  • this method is influenced by external noise (nearby grinders in the grinding chamber) as well as other factors such as the nature of the crushed material, the shape of the grinding media and the wear of the shield.
  • Such a method is described in the article "New acoustic method for measuring the filling ratio of mill feed in tube mills" by F. Godler and J. Hagenbach, Zement-Kalk-Gyps No. 4/1994, pE 114-E 119 .
  • the document US-A-5,698,797 discloses a device for controlling a ball mill comprising a cylinder which contains a mass of balls which, when the mill is rotating at a nominal speed, take a position between two generatrices spaced by an angle between a minimum angle and a maximum angle, and a coal mass which, when the mill is rotating at a nominal speed, takes a position between two generators, said apparatus further comprising an electromagnetic wave transmitter disposed within the mill and at least one wave receiver disposed outside the mill, said at least one wave receiver being operably connected to an electronic circuit for determining at least one parameter of the mill selected from the group consisting of a quantity of balls, a quantity of coal and the wear of the cylinder.
  • the measurement by wave absorption makes it possible to distinguish the material to grind balls but is not applicable to any type of material and presents a health hazard because of X-rays or gamma.
  • the object of the present invention is to provide a new method and device which allows a reliable evaluation of the filling ratio, which can be easily implemented on an existing mill and which can separately provide information regarding the grinding load and pulp.
  • the present invention provides a method of the kind described in the preamble which is characterized in that one establishes, by modeling, an algorithm which defines a relationship between the degree of filling of a mill, a part, and the angular positions of the foot and the head of the grinder contents, as well as its absorbed power, on the other hand, in that it is measured in the grinder whose fill rate is to be determined angular positions of the foot and the head of the content, as well as its absorbed power and in that one determines, using these measures and the algorithm, the filling rate of the mill.
  • the angular positions of the foot and the head of the grinding charge are determined inductively, while the angular positions of the foot and the head of the pulp are determined by a conductive route.
  • the device for carrying out this method for the evaluation of the filling rate of a mill whose shell comprises an inner shield is characterized in that the shield comprises at least one resin or elastomer plate in which is integrated a detection system for detecting the angular position at which the system enters the grinder contents and the angular position at which the system leaves the grinder contents, in that the ferrule comprises a sensor for generating a synchronization signal at each mill tower, in that the signals supplied by the detection system and the sensor are processed in an on-board processing device and sent by radio to a computer center.
  • the detection device preferably comprises an inductive sensor for determining the angular positions of the foot and the head of the grinding charge and a conductive sensor for determining the angular positions of the foot and the head of the pulp.
  • All the sensors are preferably doubled and buried at different depths in the plates that carry them in order to enter into service successively as and when the plates wear.
  • Fig. 1 shows a grinder whose grinding load 1 consists of balls and which contains a quantity of material to be crushed 2 forming the pulp.
  • the grinding ball filling generally corresponds, depending on the operating conditions, to 20 to 40% of the total volume of the mill.
  • the volume of the pulp corresponds for optimum operation of the mill, as has been stated in the introduction, approximately to the volume of the voids between the balls or is slightly higher without exceeding it by 20%.
  • the contents of the mill has, in section, the overall shape of a "bean" and focuses essentially in the fourth trigonometric quarter.
  • the feet 3 and 5 of the pulp, respectively the balls extend in the third trigonometric quarter, while the heads 4 and 6 of the pulp, respectively of the balls, are raised in the first trigonometric quarter.
  • the invention provides sensors that trigger an electrical signal when they enter the pulp 2, respectively the load 1, and another signal at the time they leave.
  • the invention provides conductive sensors 7 and 8 by which is measured a current created by a chemical stack consisting of two steel masses of different compositions forming electrodes which, interconnected by a conductive medium constituted by the pulp, are the source of an electric current.
  • a pair of sensors 7, 8 respectively shown in Figures 4 and 5. As can be seen, these sensors are buried at different depths in the elastomer plate 9. Thus, when the sensor 7, 8 at the surface of Figure 4 is degraded by wear, the sensor 7, 8 of Figure 5 buried in the plate 9 can take over.
  • an inductive sensor 10 known per se, which will also be arranged in the plate 9 of the door and embedded in the mass of the resin. As shown in Figures 2, 4 and 5 will also use two sensors 10 buried at different depths to continue measurements when the surface sensor is degraded by wear.
  • a synchronization signal is generated at each revolution of the mill by a device of cells, for example photoelectric cells, respectively provided on the ferrule and on a fixed frame and making it possible to provide a reference for determining the angular positions. . If this signal is the starting point, knowing the speed of rotation of the drum, the moments of appearance and disappearance of the measurement signals provide an indication of the angular positions of the feet 3 and 5 and the heads 4 and 6 with respect to a reference point which can be that of the position of the synchronization device.
  • the signals supplied by the sensors are recorded, filtered and processed by an embedded system 12 fixed to the ferrule which sends them by radio to a computer center not shown. All these embedded devices can be powered by an electric generator 13 fixed on the ferrule or by inductive energy transmission.
  • FIG. 6 schematically illustrates the measurements provided by the sensors 7, 8 and 10. These are the angles ⁇ 1 and ⁇ 2 of the foot 3, respectively of the head 4, of the pulp, as well as the angles ⁇ 1 and ⁇ 2 of the foot 5, respectively of the head 6, of the grinding charge. These angles are measured with respect to a reference axis determined, in this case, by the synchronization device.
  • Figure 7 summarizes the results of such tests for the evaluation of the filling rate of grinding machinery for the grinding of ores.
  • the load for these tests consisted of 40 mm and 25 mm diameter balls.
  • the relative percentage of minerals - water was kept constant and the mill speed was 34 rpm.
  • the filling of the ball mill has been progressively increased from 700 kg to 900 kg per addition between 8 and 20 kg.
  • the pulp filling was not controlled but was the result of the evolution of the process and varied between 289 and 443 kg.
  • the straight line in FIG. 7 represents the actual quantities of balls in the mill.
  • the points represent the evaluations of the quantity of balls obtained by means of the aforementioned mathematical model and on the basis of the measurement of the angles ⁇ 1 and ⁇ 2 as well as the power absorbed.
  • the measurement of the angular positions ⁇ 1 and ⁇ 2 concerning the pulp provides, in addition, information on the fluidity of the pulp, that is to say its water content. Indeed, the lift of the pulp, so the angle ⁇ 2 is all the lower as the fluidity is greater. This knowledge also contributes to optimizing the operation of the mill.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
  • Disintegrating Or Milling (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Control Of Metal Rolling (AREA)
  • Management, Administration, Business Operations System, And Electronic Commerce (AREA)
  • Containers And Plastic Fillers For Packaging (AREA)
  • Sampling And Sample Adjustment (AREA)
EP02803364A 2001-11-22 2002-11-11 Procede d'evaluation du taux de remplissage d'un broyeur rotatif tubulaire et dispositif pour sa mise en oeuvre Expired - Lifetime EP1448304B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
BE200100758 2001-11-22
BE2001/0758A BE1014486A3 (fr) 2001-11-22 2001-11-22 Procede d'evaluation du taux de remplissage d'un broyeur rotatif tubulaire et dispositif pour sa mise en oeuvre.
PCT/EP2002/012637 WO2003043740A1 (fr) 2001-11-22 2002-11-11 Procede d'evaluation du taux de remplissage d'un broyeur rotatif tubulaire et dispositif pour sa mise en oeuvre

Publications (2)

Publication Number Publication Date
EP1448304A1 EP1448304A1 (fr) 2004-08-25
EP1448304B1 true EP1448304B1 (fr) 2008-01-09

Family

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EP02803364A Expired - Lifetime EP1448304B1 (fr) 2001-11-22 2002-11-11 Procede d'evaluation du taux de remplissage d'un broyeur rotatif tubulaire et dispositif pour sa mise en oeuvre

Country Status (14)

Country Link
US (1) US7347113B2 (zh)
EP (1) EP1448304B1 (zh)
CN (1) CN1305574C (zh)
AT (1) ATE383201T1 (zh)
AU (1) AU2002366196B2 (zh)
BE (1) BE1014486A3 (zh)
BR (1) BR0214198B1 (zh)
CA (1) CA2466593C (zh)
DE (1) DE60224561T2 (zh)
DK (1) DK1448304T3 (zh)
ES (1) ES2297054T3 (zh)
NO (1) NO329507B1 (zh)
WO (1) WO2003043740A1 (zh)
ZA (1) ZA200403559B (zh)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI115854B (fi) 2003-01-17 2005-07-29 Outokumpu Oy Menetelmä myllyn täyttöasteen määrittämiseksi
WO2007124528A1 (en) * 2006-04-27 2007-11-08 The University Of Queensland Method and apparatus for monitoring a mill
PE20120203A1 (es) * 2008-10-30 2012-03-24 Zyl Dorothea Van Un sistema de proteccion y un sistema de seguimiento de cargas caidas
CN103495487B (zh) * 2013-10-17 2016-01-06 中冶长天国际工程有限责任公司 一种磨矿机控制中调节钢球填充率的方法和装置
FI125518B (en) 2014-04-28 2015-11-13 Outotec Finland Oy Method and arrangement for determining a degree of filling of a large mill drum and large mill drum
EP3097979A1 (en) * 2015-05-28 2016-11-30 ABB Technology AG Method for determining a lifting angle and method for positioning a grinding mill
CN107966173B (zh) * 2017-12-28 2023-09-05 湖南科技大学 圆管带式输送机实验台管带横截面物料填充率测量装置
CN110314741A (zh) * 2018-03-29 2019-10-11 南京梅山冶金发展有限公司 精确测量球磨机介质充填率的方法
CN109840377B (zh) * 2019-01-30 2022-12-30 北京矿冶科技集团有限公司 一种磨机混合填充率在线软测量方法
CN115697563A (zh) * 2020-04-09 2023-02-03 S.P.M.仪器公司 用于生成与滚磨机的内部状态相关的信息的方法和系统
CN111633828B (zh) * 2020-05-28 2021-07-30 三一专用汽车有限责任公司 测量装置、搅拌筒、混凝土搅拌运输车和测量方法
CN115055272A (zh) * 2022-04-29 2022-09-16 云南驰宏锌锗股份有限公司 一种中型球磨机最佳充填率的确定方法

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1607580A1 (de) * 1967-04-26 1969-10-02 Rheinische Kalksteinwerke Verfahren zur Bestimmung des Schuettprofils und der sich daraus ergebenden Leistungsaufnahme einer Rohrmuehle
DE2117556A1 (de) * 1971-04-10 1972-10-26 Fried. Krupp Gmbh, 4300 Essen Verfahren und Vorrichtung zum Regeln des Füllstandes von Kugelmühlen
SE468749C (sv) 1991-07-12 1996-11-18 Skega Ab Anordning för registrering av i en kvarntrumma förekommande malchargevolym
US5698787A (en) * 1995-04-12 1997-12-16 Mcdonnell Douglas Corporation Portable laser/ultrasonic method for nondestructive inspection of complex structures
FR2734739B1 (fr) * 1995-06-01 1997-07-11 Gec Alsthom Stein Ind Dispositif de surveillance d'un broyeur a boulets
FR2792224B1 (fr) * 1999-04-15 2001-06-01 Alstom Procede pour controler le niveau de remplissage en charbon d'un broyeur a boulets
DE19933995A1 (de) 1999-07-20 2001-03-01 Kima Ges Fuer Echtzeitsysteme Füllstandsmessung für Kugelmühlen
DE10253791A1 (de) * 2001-12-24 2003-07-03 Gustav Eirich Gmbh & Co Kg Rührwerksmühle

Also Published As

Publication number Publication date
AU2002366196A1 (en) 2003-06-10
DK1448304T3 (da) 2008-05-26
NO20041757L (no) 2004-07-15
BR0214198A (pt) 2004-08-31
US7347113B2 (en) 2008-03-25
ATE383201T1 (de) 2008-01-15
BE1014486A3 (fr) 2003-11-04
CN1589178A (zh) 2005-03-02
EP1448304A1 (fr) 2004-08-25
DE60224561T2 (de) 2008-04-30
US20040256505A1 (en) 2004-12-23
CA2466593A1 (en) 2003-05-30
ES2297054T3 (es) 2008-05-01
CA2466593C (en) 2011-07-26
BR0214198B1 (pt) 2011-04-19
WO2003043740A1 (fr) 2003-05-30
ZA200403559B (en) 2005-05-25
CN1305574C (zh) 2007-03-21
NO329507B1 (no) 2010-11-01
AU2002366196B2 (en) 2007-06-07
DE60224561D1 (de) 2008-02-21

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