EP1448304A1 - Method for evaluating the filling rate of a tubular rotary ball mill and device therefor - Google Patents
Method for evaluating the filling rate of a tubular rotary ball mill and device thereforInfo
- Publication number
- EP1448304A1 EP1448304A1 EP02803364A EP02803364A EP1448304A1 EP 1448304 A1 EP1448304 A1 EP 1448304A1 EP 02803364 A EP02803364 A EP 02803364A EP 02803364 A EP02803364 A EP 02803364A EP 1448304 A1 EP1448304 A1 EP 1448304A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- mill
- filling rate
- head
- foot
- pulp
- 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.)
- Granted
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
- B02C17/1805—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 around its longitudinal axis, the content of which consists of a load of grinding machines made of metal alloy and of the material to be grind 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 crusher while the foot of the content 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 relates essentially to mills of the ball or bar mill type, used in particular for grinding clinker or grinding coal and ores.
- the optimal 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 yield decreases and, above all, the grinding machines which are in contact with each other wear out mutually.
- the volume of the pulp is too large, the grinding yield also decreases. Knowing the quantity of pulp in the grinder therefore makes it possible to adjust the feeding of the crusher in the most suitable way which is suitable for optimal functioning of the crusher.
- a first means consists in measuring the evolution of the power absorbed by the mill. This power absorbed by the crusher increases with the filling rate until it reaches a maximum beyond which it begins to decrease, in particular because of the least 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 Minerai Processors" Proceedings 1998, paper No. 24 Ottawa, Ontario.
- a second method consists in measuring the forces exerted on the shielding. There is a shielded plate instrumented in the shielding and when the latter enters the load, the force exerted on the plate increases suddenly and decreases when the latter leaves the load. This measure is only applicable in a grinder equipped with a rubber shield and is very sensitive to the wear of the instrumented plate. Such a method is described in patent WO93 / 00996.
- Another method consists in measuring the deformation of the shell of the mill since it undergoes radial and transverse deformations which are all the more important as the mill is filled.
- the sensitivity of this measurement is reduced in the case of a low L / D ratio (length of the mill over diameter) and by any stiffening element such as an intermediate partition or a large thickness of the shell or of the shielding.
- the principle of this measurement is described in the article "Measurement System of the Mill charge in Grinding Bail Mill circuits" by J. Kolacz-Mineral Engineering, Vol 10, No. 12, 1997 p 1329-1338.
- Another method consists in measuring the noise generated by the shocks between the grinding bodies and the shield of the grinder. This noise increases with the filling rate in grinding machines but, the material to crush shock absorbing, the noise decreases when the filling in material increases, hence inaccuracy of the. measured.
- microphones were used which are placed near the shell of the mill to pick up noise. This method is, however, influenced by outside noise (neighboring crushers in the crushing hall) as well as other factors such as the nature of the crushed material, the shape of the crushing bodies and the wear of the shielding.
- outside noise neighborhboring crushers in the crushing hall
- 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, p. E 1 14-E 119.
- German patent DE19933995A1 attempts to remedy the interference of the various noises by replacing the microphones with ultrasonic sensors fixed to the ferrule. These sensors measure the oscillations of the shell where they are fixed and not the noise transmitted through the air, which solves the problem of noise.
- the aim of the present invention is to provide a new method and device which allows a reliable evaluation of the filling rate, which can be easily implemented on an existing mill and which can separately provide information regarding the grinding load and pulp.
- the present invention proposes a method of the type described in the preamble which is characterized in that an algorithm is established by modeling which defines a relationship between the degree of filling of a mill, a on the one hand, and the angular positions of the foot and the head of the contents of the crusher, as well as its absorbed power, on the other hand, in that one measures in the crusher whose filling rate is to be determined the angular positions of the foot and the head of the contents, as well as its absorbed power and in that the filling rate of the mill is determined using these measurements and the algorithm.
- the angular positions of the foot and the head of the grinding load are determined inductively, while the angular positions of the foot and of the head of the pulp are determined conductively.
- the device for the implementation of this process for the evaluation of the filling rate of a mill whose shell has an inner shield is characterized in that the shield comprises at least one resin or elastomer plate in which is integrated a detection system intended to detect the angular position at which the system enters the contents of the mill and the angular position at which the system leaves the contents of the mill, in that the ferrule includes a sensor intended to generate a synchronization signal at each turn of the mill, 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 of the head of the grinding load and a conductive sensor for determining the angular positions of the foot and of the head of the pulp.
- All the sensors are preferably doubled and buried at different depths of the plates which carry them in order to enter into service successively as the plates wear.
- FIG. 1 schematically illustrates a diametrical section through a grinder
- - fig. 2 is a schematic view of a longitudinal section through a mill equipped with the equipment proposed by the present invention
- - fig. 3 schematically illustrates a diametrical section through the grinder of FIG. 2; - fig. 4 and 5 show an enlarged sectional view of the plates carrying the sensors;
- FIG. 6 is a view similar to that of FIG. 1 illustrating the details of the angular positions and - FIG. 7 shows a graph representing the correlation between the calculation made according to the present invention and the actual weighing of the grinding machines.
- Fig. 1 shows a mill whose grinding charge 1 is made up of balls and which contains a certain quantity of material to be ground 2 forming the pulp.
- the filling with grinding balls 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 an optimal operation of the mill, as it was specified in the introduction, approximately to the volume of the voids between the balls or is slightly greater without exceeding it by 20%.
- the content of the mill has, in section, the overall shape of a "bean” and is mainly concentrated in the fourth trigonometric quarter.
- the feet 3 and 5 of the pulp, respectively of the balls extend however 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 which trigger an electrical signal when they enter the pulp 2, respectively the load 1, and another signal when they exit therefrom.
- the invention has provided conductive sensors 7 and 8 by which a measurement is made of a current created by a chemical cell constituted by two masses of steel of different compositions forming electrodes which, connected together by a conductive medium formed by the pulp, are the source of an electric current.
- These steel masses are integrated into a resin or elastomer plate 9 which, for ease of access, can be placed on the door of the mill.
- a pair of sensors 7, 8 shown respectively in FIGS. 4 and 5 is provided. As can be seen, these sensors are buried at different depths in the elastomer plate 9. Thus, when the sensor 7, 8 on the surface of Figure 4 is degraded by wear, the sensor 7, 8 of Figure 5 buried in the plate 9 can take over.
- the sensor 7, 8 of Figure 5 buried in the plate 9 can take over.
- the electrodes 7 and 8 of the sensor penetrate into the pulp, the latter allows the passage of a current between these electrodes thus triggering a signal whose appearance makes it possible to determine the angular position of the foot 3 of the pulp.
- the electrodes 7, 8 come out of the pulp the current is interrupted and the moment of this interruption provides information on the angular position of the pulp head 4.
- a synchronization signal is generated at each revolution of the mill by a device of cells, for example photoelectric, provided respectively on the ferrule and on a fixed chassis and making it possible to provide a reference for determining the angular positions. . If this signal is the point of at the outset, knowing the rotation speed 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 of the heads 4 and 6 relative to a reference point which may be that the position of the synchronization device.
- the signals supplied by the sensors are recorded, filtered and processed by an on-board system 12 fixed to the shell which, sends them by radio to a computer center not shown. All these on-board devices can be powered by an electric generator 13 fixed on the shell or by energy transmission by inductive means.
- FIG. 6 schematically illustrates the measurements provided by the sensors 7, 8 and 10. These are the angles ⁇ , and ⁇ 2 of the foot 3, respectively of the head 4, of the pulp, as well as the angles Q> ⁇ and ⁇ 2 of foot 5, respectively of head 6, of the grinding load. These angles are measured with respect to a reference axis determined, in this case, by the synchronization device.
- J 1 a ⁇ a + b 1 ⁇ 2 + ⁇ , kW + d 1
- J 2 a 2 ⁇ 1 + b 2 ⁇ 2 + c 2 kW + d 2 in which:
- FIG. 7 summarizes the results of such tests for the evaluation of the filling rate in grinding machines for grinding ores.
- the charge for these tests consisted of balls of 40 mm and 25 mm in diameter.
- the relative mineral-water percentage was kept constant and the mill speed was 34 rpm.
- the filling of the ball mill has been gradually increased from 700 kg to 900 kg by additions between 8 and 20 kg.
- the filling with pulp was not controlled but was the result of the evolution of the process and varied between 289 and 443 kg.
- the straight line in Figure 7 represents the actual quantities of balls in the grinder.
- the points represent the evaluations of the quantity of balls obtained thanks to the aforementioned mathematical model and based on the measurement of the angles c ⁇ and ⁇ 2 as well as of the absorbed power. These tests have shown that the invention allows an evaluation of the filling rate in balls with an accuracy of the order of 98%.
- 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 lifting of the pulp, therefore the angle ⁇ 2 , is lower the more the fluidity is greater. This knowledge also contributes to optimizing the operation of the mill.
Landscapes
- 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)
- Sampling And Sample Adjustment (AREA)
- Containers And Plastic Fillers For Packaging (AREA)
- Management, Administration, Business Operations System, And Electronic Commerce (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BE2001/0758A BE1014486A3 (en) | 2001-11-22 | 2001-11-22 | Evaluation process of filling rate of rotary tube mill and device for its implementation. |
BE200100758 | 2001-11-22 | ||
PCT/EP2002/012637 WO2003043740A1 (en) | 2001-11-22 | 2002-11-11 | Method for evaluating the filling rate of a tubular rotary ball mill and device therefor |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1448304A1 true EP1448304A1 (en) | 2004-08-25 |
EP1448304B1 EP1448304B1 (en) | 2008-01-09 |
Family
ID=3897130
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02803364A Expired - Lifetime EP1448304B1 (en) | 2001-11-22 | 2002-11-11 | Method for evaluating the filling rate of a tubular rotary ball mill and device therefor |
Country Status (14)
Country | Link |
---|---|
US (1) | US7347113B2 (en) |
EP (1) | EP1448304B1 (en) |
CN (1) | CN1305574C (en) |
AT (1) | ATE383201T1 (en) |
AU (1) | AU2002366196B2 (en) |
BE (1) | BE1014486A3 (en) |
BR (1) | BR0214198B1 (en) |
CA (1) | CA2466593C (en) |
DE (1) | DE60224561T2 (en) |
DK (1) | DK1448304T3 (en) |
ES (1) | ES2297054T3 (en) |
NO (1) | NO329507B1 (en) |
WO (1) | WO2003043740A1 (en) |
ZA (1) | ZA200403559B (en) |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FI115854B (en) | 2003-01-17 | 2005-07-29 | Outokumpu Oy | Procedure for determining the degree of filling of the mill |
WO2007124528A1 (en) * | 2006-04-27 | 2007-11-08 | The University Of Queensland | Method and apparatus for monitoring a mill |
RU2011121585A (en) * | 2008-10-30 | 2012-12-10 | ЗИЛ Пол Хендрик Стефанус ВАН | PROTECTION SYSTEM FROM COLLAPSED LOADED MATERIAL AND MONITORING SYSTEM |
CN103495487B (en) * | 2013-10-17 | 2016-01-06 | 中冶长天国际工程有限责任公司 | A kind of ore mill regulates the method and apparatus of steel ball filling rate in controlling |
FI125518B (en) | 2014-04-28 | 2015-11-13 | Outotec Finland Oy | Method and Arrangement for Determining the Filling Rate of a Large Grinder and a Large Grinder |
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 (en) * | 2017-12-28 | 2023-09-05 | 湖南科技大学 | Device for measuring filling rate of materials with cross section of pipe belt of experiment table of circular pipe belt conveyor |
CN110314741A (en) * | 2018-03-29 | 2019-10-11 | 南京梅山冶金发展有限公司 | The method of precise measurement globe mill medium pack completeness |
CN109840377B (en) * | 2019-01-30 | 2022-12-30 | 北京矿冶科技集团有限公司 | Online soft measurement method for mixed filling rate of mill |
US20230302460A1 (en) * | 2020-04-09 | 2023-09-28 | S.P.M. Instrument Ab | Method and system for generating information relating to an internal state of a tumbling mill |
CN111633828B (en) * | 2020-05-28 | 2021-07-30 | 三一专用汽车有限责任公司 | Measuring device, mixing drum, concrete mixing and transporting vehicle and measuring method |
CN115055272A (en) * | 2022-04-29 | 2022-09-16 | 云南驰宏锌锗股份有限公司 | Method for determining optimal filling rate of medium-sized ball mill |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1607580A1 (en) * | 1967-04-26 | 1969-10-02 | Rheinische Kalksteinwerke | Method for determining the profile of the Schuett and the resulting power consumption of a pipe mill |
DE2117556A1 (en) * | 1971-04-10 | 1972-10-26 | Fried. Krupp Gmbh, 4300 Essen | Method and device for regulating the fill level in ball mills |
SE468749C (en) | 1991-07-12 | 1996-11-18 | Skega Ab | Apparatus for recording milk volume in a mill drum |
US5698787A (en) * | 1995-04-12 | 1997-12-16 | Mcdonnell Douglas Corporation | Portable laser/ultrasonic method for nondestructive inspection of complex structures |
FR2734739B1 (en) * | 1995-06-01 | 1997-07-11 | Gec Alsthom Stein Ind | DEVICE FOR MONITORING A BALL MILL |
FR2792224B1 (en) * | 1999-04-15 | 2001-06-01 | Alstom | METHOD FOR CONTROLLING THE COAL FILLING LEVEL OF A BALL MILL |
DE19933995A1 (en) | 1999-07-20 | 2001-03-01 | Kima Ges Fuer Echtzeitsysteme | Measurement of the level of filling of a ball mill with aggregate by use of microphones attached directly to the wall of the mill to improve sound transmission from the mill interior and improve accuracy of level determination |
DE10253791A1 (en) * | 2001-12-24 | 2003-07-03 | Gustav Eirich Gmbh & Co Kg | agitating mill |
-
2001
- 2001-11-22 BE BE2001/0758A patent/BE1014486A3/en not_active IP Right Cessation
-
2002
- 2002-11-11 DK DK02803364T patent/DK1448304T3/en active
- 2002-11-11 US US10/494,513 patent/US7347113B2/en not_active Expired - Fee Related
- 2002-11-11 CA CA2466593A patent/CA2466593C/en not_active Expired - Fee Related
- 2002-11-11 BR BRPI0214198-1A patent/BR0214198B1/en not_active IP Right Cessation
- 2002-11-11 CN CNB028231759A patent/CN1305574C/en not_active Expired - Fee Related
- 2002-11-11 AU AU2002366196A patent/AU2002366196B2/en not_active Ceased
- 2002-11-11 DE DE60224561T patent/DE60224561T2/en not_active Expired - Lifetime
- 2002-11-11 WO PCT/EP2002/012637 patent/WO2003043740A1/en active IP Right Grant
- 2002-11-11 ES ES02803364T patent/ES2297054T3/en not_active Expired - Lifetime
- 2002-11-11 AT AT02803364T patent/ATE383201T1/en not_active IP Right Cessation
- 2002-11-11 EP EP02803364A patent/EP1448304B1/en not_active Expired - Lifetime
-
2004
- 2004-04-29 NO NO20041757A patent/NO329507B1/en not_active IP Right Cessation
- 2004-05-10 ZA ZA2004/03559A patent/ZA200403559B/en unknown
Non-Patent Citations (1)
Title |
---|
See references of WO03043740A1 * |
Also Published As
Publication number | Publication date |
---|---|
ATE383201T1 (en) | 2008-01-15 |
DE60224561T2 (en) | 2008-04-30 |
CA2466593C (en) | 2011-07-26 |
NO329507B1 (en) | 2010-11-01 |
CN1589178A (en) | 2005-03-02 |
BR0214198A (en) | 2004-08-31 |
CN1305574C (en) | 2007-03-21 |
BE1014486A3 (en) | 2003-11-04 |
CA2466593A1 (en) | 2003-05-30 |
AU2002366196B2 (en) | 2007-06-07 |
DE60224561D1 (en) | 2008-02-21 |
US20040256505A1 (en) | 2004-12-23 |
US7347113B2 (en) | 2008-03-25 |
ZA200403559B (en) | 2005-05-25 |
DK1448304T3 (en) | 2008-05-26 |
EP1448304B1 (en) | 2008-01-09 |
NO20041757L (en) | 2004-07-15 |
AU2002366196A1 (en) | 2003-06-10 |
ES2297054T3 (en) | 2008-05-01 |
WO2003043740A1 (en) | 2003-05-30 |
BR0214198B1 (en) | 2011-04-19 |
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