WO2007054967A2 - Broyeur agitateur de micro-matieres - Google Patents

Broyeur agitateur de micro-matieres Download PDF

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Publication number
WO2007054967A2
WO2007054967A2 PCT/IN2006/000373 IN2006000373W WO2007054967A2 WO 2007054967 A2 WO2007054967 A2 WO 2007054967A2 IN 2006000373 W IN2006000373 W IN 2006000373W WO 2007054967 A2 WO2007054967 A2 WO 2007054967A2
Authority
WO
WIPO (PCT)
Prior art keywords
mill
slurry
micro
media
cylinder
Prior art date
Application number
PCT/IN2006/000373
Other languages
English (en)
Other versions
WO2007054967A3 (fr
Inventor
Francisco Carvalho
Original Assignee
Francisco Carvalho
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 Francisco Carvalho filed Critical Francisco Carvalho
Priority to EP06842757A priority Critical patent/EP1945365A2/fr
Publication of WO2007054967A2 publication Critical patent/WO2007054967A2/fr
Publication of WO2007054967A3 publication Critical patent/WO2007054967A3/fr

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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
    • B02C17/183—Feeding or discharging devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/05—Stirrers
    • B01F27/11—Stirrers characterised by the configuration of the stirrers
    • B01F27/115—Stirrers characterised by the configuration of the stirrers comprising discs or disc-like elements essentially perpendicular to the stirrer shaft axis

Definitions

  • the present invention is related to a micro-media agitator mill to reduce particle size and disperse the particulate matter in slurry such as pigment in slurry.
  • micro-media agitator mills comprise of a vertical or a horizontal cylinder with a rotating shafts with a series of equally spaced agitator discs mounted on the shaft.
  • the cylinder is charged with the micro- bead grinding media 60% to 80% of its volume, depending upon the type of mill and the product to be milled.
  • the rotating shaft and the discs rotate at a high speed and generate a centrifugal force proportional to the peripheral speed, which is generally above 10 m/s at the edge of the discs.
  • 6000646 discloses a double barrel chamber for a media mill where the media mill is used to grind and disperse pigments for paint, coating, ink products, and other pigment-vehicle fluids, as well as grinding and dispersing other particulate matter.
  • a rotatable shaft Centered in each barrel is a rotatable shaft.
  • the shafts are parallel and arranged such that the edges of the discs overlap to cause major impacting and mixing in the central portion of the chamber when the shafts are rotated in a common direction.
  • a coiled cooling water jacket system for cooling the cylinder. The system allows 100%, or near 100% recovery of cleaning solvent, limits potential damage to a pumping system and allows slurry-feeding flexibility.
  • a special bearing seal section is disclosed which allows use of a diaphragm pump.
  • the pump in conjunction with the spinning discs force the pigment slurry up from the bottom of the chamber and out through a specially designed discharge screen, which is also disclosed.
  • a bump feature on each disc is disclosed. The bump feature increases pumping and impact of media in the media mill.
  • an micro-media agitator mill which provides sufficient retention time for the slurry and can provide multiple circulation of the slurry through the mill to obtain required size reduction and a narrow range of distribution of the particles in the slurry.
  • Another need is to device a micro-media agitator mill that can reduce the wear of the internal parts of the micro-media agitator mill to the minimum. Further, studies on existing mill have shown that only a small percentage of the power input to the mill is actually used to do the work of particle size reduction and dispersion; this needs to be changed so as to increase the efficiency of energy conversion.
  • a micro- media agitator mill for particle size reduction and dispersion of particulate size matter, comprises a cylinder having inlet and outlet; atleast one rotating shaft adapted centrally to the cylinder; a series of equally spaced rotating discs having a series of concentric inner openings near its axis of rotation; an inner spacer adapted between the two discs to separate the shaft and the inner openings of the rotating discs; an outer spacer adapted between the rotating discs such that inner spacer and outer spacer forms an annular space between the cylinder and shaft forming an annular passage extending from one end to other end of the mill in combination with the inner openings of the rotating discs; and a turbine adapted on the shaft for sucking the slurry and grinding media through the annular passage formed between the cylinder and shaft from one end to the other end of the mill thereby reduces the accumulation of the grinding media near the outlet of the mill and allowing re-circulation of the slurry within the mill.
  • a micro- media agitator mill for particle size reduction and dispersion of particulate matter
  • said micro-media agitator mill comprises a cylinder having inlet and outlet for slurry, wherein inner surface of cylinder has bellows-like deflectors; atleast one rotating shaft adapted centrally to the cylinder; a series of rotating discs adapted on the shaft, wherein each disc have an outer opening for passing of the slurry; and a deflector provided on the rotating shaft between the two rotating discs matching with the deflectors provided on the cylinder wherein deflectors in combination with the two rotating discs form a compartment between the two disc and directs the slurry and grinding media to circulate within the compartment improving attrition between the grinding media and increasing the retention time of the slurry in the mill.
  • the deflectors mounted between discs and provided on the inner wall of the cylinders are concave for circulation of the slurry within the compartment.
  • a rotating disc or impeller for a micro-media agitator mill having a central opening for mounting of the shaft, said disc comprises atleast two sets of concentric openings adapted at different radial positions from the central hole, wherein a set of concentric inner openings near to the rotational axis of the disc is tapered so as to create a suction force on slurry and grinding media while rotating in the micro-media agitator mill.
  • said inner openings and outer openings are of any shape and preferably they are kidney shape.
  • Fig 1 shows the cross sectional view of a micro-media agitator mill of the present invention having single shaft.
  • Fig 2 shows a magnified view of W marked on Fig 1.
  • Fig 3 shows the cross sectional view of a micro-media agitator mill of the present invention having two shafts.
  • Fig 4 shows a top view of the rotating disc of the present invention.
  • Fig 1 and Fig 3 shows micro-media agitator mills of the present invention comprising single shaft and two shafts respectively.
  • the micro-media agitator mill (100) of the present invention for particle size reduction and dispersion of particulate size matter in slurry comprises a cylinder (10) having inlet (12) and outlet (14) for the slurry in which particulates are required to be size-reduced and dispersed, a rotating shaft (20) adapted centrally to the cylinder (10), a series of equally spaced rotating discs (30) having a series of concentric inner openings (32) near its axis of rotation, an inner spacer (40) adapted between the rotating discs (30) to separate the shaft (20) and the inner openings (32) of the rotating discs (30), an outer spacer (50) adapted between the rotating discs (30) and a turbine (60) adapted on the shaft (20).
  • the inner spacer (40) and the outer spacer (50) are preferably cylinders having diameters such that an annular space (P) forms between the inner spacer and outer spaces.
  • This annular space (P) in combination with the rotating discs (30) forms an annular passage (45) extending from one end to other end of the mill.
  • the inner spacer (40) acts as a partition by avoiding contact of the grinding media with the shaft (20) thereby prevents the wear and tear of the shaft (20).
  • a turbine (60) adapted on the shaft (20) sucks the slurry and grinding media through the annular passage (45) from one end to the other end of the mill (100).
  • the turbine (60) is adapted at the end of the annular passage (45) and preferably near the inlet (12) of the cylinder (10) for slurry.
  • the inner openings (32) on the rotating disc (30) are tapered so as to produce pumping action on rotation.
  • the rotating disc (30) is mounted on the shaft (20) in such a way that the inner tapered openings (32) pushes the slurry and the grinding media from one annular space to the other annular space as shown in Fig 2 along the annular passage (45) helping the turbine (50) to re-circulate the slurry and also prevents accumulation of the grinding media at the outlet of the mill (100).
  • the cylinder (10) of the present invention may have any cross section shape such as circular, oval or a shape claimed in US 6000646 depending on the number of the shafts adapted in the cylinder such as the cylinder for single shaft mill has preferably circular cross section.
  • the cylinder (10) has plurality of the deflectors (16A) arranged like bellows on the inner surface (not shown) and similarly the present invention provides deflectors (16B) on the outer surface of the outer spacers (50).
  • the rotating disc (30) may have series of outer openings (34) near periphery to allow passage of the slurry.
  • the deflectors (16B) on the outer spacers (50) and the deflectors (16A) on the inner surface of the cylinder (10) are adapted in such a way that the deflectors (16A, 16B) are like a mirror images of each other.
  • the deflectors (16A 1 16B) have preferably concave surface.
  • These deflectors (16A, 16B) in combination with the rotating discs (30) form at least one compartment (70) between the two rotating discs (30) and the outer openings (34) act as inlets and outlets of the compartments (70).
  • the deflectors (16A, 16B) as showed in Fig 1-3 form two compartments (60) between the two discs (30).
  • the rotating discs rotate the slurry and grinding media and push it towards the inner wall of the cylinder by centrifugal force.
  • the deflectors (16A, 16B) which form compartments (70) in the mill (100) in combination with the rotating discs (30) direct the slurry and grinding media, which are pushed towards them to circulate as shown in Fig 2 within the compartments (70).
  • the deflectors circulate the slurry, which is in contact with the upper surface of the rotating disc (30) in a direction ⁇ 1 ' while the slurry which is in contact with the lower surface of the rotating discs (30) in a direction ⁇ 2" causing in increase in the differential velocity (d) between grinding media.
  • the turbine (60) with the help of the inner openings (32) on the rotating discs (30) sucks the slurry and grinding media reached at the outlet (12) of the cylinder (10) in a direction (X) and re-circulates the grinding media and partial or total amount of slurry within the mill (100) thereby prevents accumulation of the grinding media at the outlet of the mill (100) and increases the retention time of the slurry in the mill (100).
  • the micro-media agitator mill (200) as shown in Fig 3 comprises two shaft (2OA, 20B) adapted off-centrally and plurality of rotating discs (30) adapted on the shafts partially overlapped with each other wherein the deflectors (16B) mounted on the shafts (2OA, 20B) form compartments (70 A) between rotating discs (30) of the shafts (10A, 10B) in addition to the compartments (70) that are formed by the deflectors (16B) mounted on the shaft with the deflectors (16A) provided on the inner wall of the cylinder (10).
  • the shafts (10A, 10B) of the mill (100) rotate in the same clock/anticlockwise direction thereby achieving exceptionally high differential velocity in the compartments (70A) form by overlapping of the rotating discs (30).
  • the present invention also provides the mill having compartments only for circulation of the grinding media and slurry within the compartments i.e. the mill may not have annular passage for re-circulation of the slurry and grinding media within the mill or the mill having only annular passage to re- circulate the grinding media and slurry i.e. the mill may not have compartments.
  • the rotating discs have only outer opening for the mills having only compartments for the passage of the slurry from one compartment to another compartment whereas the rotating discs adapted in the mill having inner passage have only tapered inner openings for re-circulation of grinding media and slurry within the mill.
  • the micro-media agitator mill of the present invention can be operated vertical or horizontal with necessary modifications.
  • the mills (100) shown in the Fig 1 and 3 are the horizontal mills.
  • the present invention also provides a rotating disc (30) for a micro-media agitator mill.
  • the rotating disc (30) has a central opening (36) for mounting on the shaft (20).
  • the rotating disc (30) comprises atleast two sets of concentric openings (32, 34) adapted at different radial positions from its axis of rotation (W).
  • An inner set (32) of concentric openings, which is near to the axis of rotation (W) is tapered so as to create a pumping action on slurry and grinding media in the micro-media agitator mill as described earlier.
  • the dimensions of the concentric openings depend upon the throughput of the slurry required through the micro-media agitator mill.
  • the concentric openings are any shape and preferably of kidney shape as according to the inventor, kidney shape openings provide larger area for slurry to circulate through the disc.
  • a system of separation provided at the outlet of the micro-media agitator mill to separate the grinding media from dispersed slurry depends on dimensions of the grinding media and the field of the application of the micro-media agitator mill.
  • the system of separation shown in the Fig 1 and 3 is a centrifugal separator (90).
  • the separator means can be any type of separator like screen, gap separator etc.
  • the mill may have cooling arrangement (15) as shown in Fig 1-3.
  • the mill of the present invention increases the amount of hydraulic shear developed and also enhances the forces of attrition within the grinding media suspended in the slurry in each compartment.
  • Each compartment of the micro-media agitator mill acts as a separate micro-media agitator mill.
  • micro-media agitator mill of the present invention provides re-circulation of the slurry and the grinding media within the mill though the annular passage, one can easily achieve the required size reduction of the particles and dispersion in the slurry with one pass of the slurry through the mill of the present invention.
  • the mill of the present invention reduces the particle size can be used to reduce the particle size substantially below sub-microns i.e. below 1 micron with less power input and wear and tear of the mill.
  • the mill of the present invention enables the processing of slurries with high solid content and high viscosities in spite of running the mill at relatively low peripheral speeds thus achieving very high efficiency.
  • the mill of the present invention therefore increases the amount of energy conversion for the purpose of de-agglomeration, particle size reduction, and dispersion with an additional advantage of greatly reducing wear and tear of mill internals due to the employment of relatively lower peripheral speeds of the shafts of the mill of the present invention.

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

Abstract

La présente invention concerne un broyeur agitateur de micro-matières pour réduction granulométrique et dispersion de matière particulaire dans une boue qui comprend un cylindre qui possède une entrée et une sortie pour la boue, la surface intérieure du cylindre comportant des déflecteurs en forme de soufflet ; au moins un arbre rotatif conçu de façon centrale au cylindre ; une série de disques rotatifs conçus sur l’arbre, chaque disque comportant une ouverture extérieure pour faire passer la boue ; et un déflecteur prévu sur l’arbre rotatif entre les deux disques rotatifs, assorti aux déflecteurs prévus sur l’arbre, les déflecteurs, en association aux deux disques rotatifs, formant un compartiment entre les deux disques et dirigeant la boue et les matières de broyage pour circuler à l’intérieur du compartiment, optimisant l’attrition entre les matières de broyage et augmentant le temps de rétention de la boue dans le broyeur. En outre, le cylindre possède une pluralité de déflecteurs en forme de soufflet sur la surface intérieure assortis aux déflecteurs prévus sur la surface extérieure d’entretoises extérieures, formant ainsi au moins un compartiment en association aux disques rotatifs entre les deux disques rotatifs qui dirigent la boue et les matières de broyage pour circuler à l’intérieur du compartiment, optimisant ainsi l’attrition entre les matières de broyage et augmentant le temps de rétention de la boue dans le broyeur.
PCT/IN2006/000373 2005-09-18 2006-09-18 Broyeur agitateur de micro-matieres WO2007054967A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP06842757A EP1945365A2 (fr) 2005-09-18 2006-09-18 Broyeur agitateur de micro-matieres

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IN855/MUM/2005 2005-09-18
IN855MU2005 2005-09-18

Publications (2)

Publication Number Publication Date
WO2007054967A2 true WO2007054967A2 (fr) 2007-05-18
WO2007054967A3 WO2007054967A3 (fr) 2008-01-31

Family

ID=38023681

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IN2006/000373 WO2007054967A2 (fr) 2005-09-18 2006-09-18 Broyeur agitateur de micro-matieres

Country Status (2)

Country Link
EP (1) EP1945365A2 (fr)
WO (1) WO2007054967A2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108435341A (zh) * 2018-04-26 2018-08-24 苏州世名科技股份有限公司 用于制备颗粒分散体的研磨设备

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4066215A (en) * 1976-07-13 1978-01-03 Carlos Oliver Pujol Disc for grinder
US5333804A (en) * 1993-08-20 1994-08-02 Premier Mill Corp. Agitator mill
EP0700723A1 (fr) * 1994-09-09 1996-03-13 EVV-Vermögensverwaltungs-GmbH Broyeur agitateur

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4066215A (en) * 1976-07-13 1978-01-03 Carlos Oliver Pujol Disc for grinder
US5333804A (en) * 1993-08-20 1994-08-02 Premier Mill Corp. Agitator mill
EP0700723A1 (fr) * 1994-09-09 1996-03-13 EVV-Vermögensverwaltungs-GmbH Broyeur agitateur

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108435341A (zh) * 2018-04-26 2018-08-24 苏州世名科技股份有限公司 用于制备颗粒分散体的研磨设备
CN108435341B (zh) * 2018-04-26 2023-11-14 苏州世名科技股份有限公司 用于制备颗粒分散体的研磨设备

Also Published As

Publication number Publication date
EP1945365A2 (fr) 2008-07-23
WO2007054967A3 (fr) 2008-01-31

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