US3224686A - Impact pulverization-classification - Google Patents

Impact pulverization-classification Download PDF

Info

Publication number
US3224686A
US3224686A US190761A US19076162A US3224686A US 3224686 A US3224686 A US 3224686A US 190761 A US190761 A US 190761A US 19076162 A US19076162 A US 19076162A US 3224686 A US3224686 A US 3224686A
Authority
US
United States
Prior art keywords
solids
classification
carrier gas
pulverized
pulverization
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
US190761A
Other languages
English (en)
Inventor
Jr Curtis C Wallace
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.)
EIDP Inc
Original Assignee
EI Du Pont de Nemours and Co
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
Priority to BE631610D priority Critical patent/BE631610A/xx
Application filed by EI Du Pont de Nemours and Co filed Critical EI Du Pont de Nemours and Co
Priority to US190761A priority patent/US3224686A/en
Priority to CH484963A priority patent/CH400733A/fr
Priority to FR932357A priority patent/FR1355213A/fr
Priority to GB16306/63A priority patent/GB958484A/en
Priority to DEP31687A priority patent/DE1291604B/de
Application granted granted Critical
Publication of US3224686A publication Critical patent/US3224686A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C13/00—Disintegrating by mills having rotary beater elements ; Hammer mills
    • B02C13/14—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C13/00—Disintegrating by mills having rotary beater elements ; Hammer mills
    • B02C13/14—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices
    • B02C13/18—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices with beaters rigidly connected to the rotor
    • B02C13/1807—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices with beaters rigidly connected to the rotor the material to be crushed being thrown against an anvil or impact plate
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C13/00—Disintegrating by mills having rotary beater elements ; Hammer mills
    • B02C13/14—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices
    • B02C13/18—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices with beaters rigidly connected to the rotor
    • B02C13/1807—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices with beaters rigidly connected to the rotor the material to be crushed being thrown against an anvil or impact plate
    • B02C13/1814—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices with beaters rigidly connected to the rotor the material to be crushed being thrown against an anvil or impact plate by means of beater or impeller elements fixed on top of a disc type rotor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C13/00—Disintegrating by mills having rotary beater elements ; Hammer mills
    • B02C13/22—Disintegrating by mills having rotary beater elements ; Hammer mills with intermeshing pins ; Pin Disk Mills
    • B02C13/24—Disintegrating by mills having rotary beater elements ; Hammer mills with intermeshing pins ; Pin Disk Mills arranged around a vertical axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
    • B02C23/18—Adding fluid, other than for crushing or disintegrating by fluid energy
    • B02C23/24—Passing gas through crushing or disintegrating zone
    • B02C23/30—Passing gas through crushing or disintegrating zone the applied gas acting to effect material separation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
    • B02C23/18—Adding fluid, other than for crushing or disintegrating by fluid energy
    • B02C23/24—Passing gas through crushing or disintegrating zone
    • B02C23/32—Passing gas through crushing or disintegrating zone with return of oversize material to crushing or disintegrating zone

Definitions

  • This invention relates to a method and apparatus for impact pulverization-classification, and particularly to such a method and apparatus wherein the classification is conducted immediately after the impact size reduction, while the pulverized product is still completely dispersed in the carrier gas with which the apparatus is swept.
  • an object of this invention is to provide a method and apparatus for impact pulverization-classification wherein the classification is effected immediately after the pulverization and while the particles are in dispersion in the carrier gas stream.
  • Another object of this invention is to provide a pulverization apparatus which is low in cost and maintenance, compact, and one for which the power consumption is low.
  • Another object of this invention is the provision of a pulverization apparatus adapted to the interchangeable utilization of different types of close-coupled classification apparatus therewith.
  • FIG. 1 is a side elevation view of a preferred embodiment of complete impact pulverization-classification apparatus according to this invention
  • FIG. 2 is a sectional side elevation view of the impact pulverization-classification zone of the apparatus of FIG. 1, with the connections to recycle ducts omitted,
  • FIG. 3 is a sectional side elevation view of the pulverization-classification zone of a second embodiment of apparatus especially adapted to the processing of materials the particles of which have a relatively high tendency to agglomerate, the showing being limited solely to the left-hand half of the apparatus, the right-hand half being identical,
  • FIG. 4 is a fragmentary plan view taken on line 44 of FIG. 2,
  • FIG. 5 is a longitudinal section of a preferred design of classification fluid nozzle adapted to use with the apparatus of FIG. 3, and
  • FIG. 6, which is a section on line 66, FIG. 3.
  • this invention comprises a method and apparatus for impact pulverization-classification of solids comprising, in sequence, subjecting the solids to centrifugal impact pulverization in the presence of a concurrently flowing stream of carrier gas, thereby effecting the throwout of coarse pulverized solids by the combined effects of centrifugal force and gravity, and the entrainment of fine dispersed pulverized solids in the carrier gas, introducing an additional quantity of carrier gas in vortical flow to the carrier gas entraining the fine dispersed pulverized solids in suflicient quantity to effect a classification of the dispersed pulverized solids into a first fraction of fine particle size concentrated centrally of the vortical fiow and a second fraction of coarse particle size concentrated peripherally of the vortical flow, and withdrawing at least the first fraction as a separate pulverized product.
  • Impact pulverization can be conducted most efficiently in rotary mills, such as those generally shown in US. Patent 2,694,492 and 2,981,490, employing a rapidly rotating disk provided with peripherally disposed teeth past which solids to be pulverized are flung under extreme centrifugal force loadings against either circumferential anvil surfaces, or past interdigitating stationary or counter-rotating teeth which, in themselves, constitute anvil surfaces, thereby effecting solids pulverization by very high energy impact. It is this type of impact pulverization which is intended by the term centrifugal as used herein, it being obvious that a great variety of designs of such pulverizing apparatus now exist or can be devised to meet specific pulverization requirements.
  • the rapid rotation of the pulverizer disk acts as a fan impeller and, accordingly, drives a considerable amount of air through the mill along with the solids in the course of pulverization.
  • This air constitutes a carrier vehicle for the finer-sized products of pulverization, and that which is supplied to the centrifugal mill feed inlet is hereinafter referred to as carrier gas, whereas that which is added after the pulverization to provide the high speed vortical classification medium is denoted additional carrier gas.
  • carrier gas that which is added after the pulverization to provide the high speed vortical classification medium.
  • An important advantage of my method and apparatus is the conservation of energy imparted to the carrier gas during the centrifugal impact pulverization, so that the latter complements and greatly reinforces the classification effect obtained by the introduction of the additional carrier gas in vortical flow immediately following the pulverization. Even more important is the fact that classification is, by this invention, obtained immediately after impact pulverization and before there is any intervening agglomeration of the freshly pulverized material. Performance tests have shown that products of vastly improved properties are thereby obtained, especially as regards heat-sensitive materials which suffer thermal degradation in the usual grinding equipment and also substances which must have uniform particle fineness throughout, such as grit-free paint pigments and the like.
  • FIGS. 1 and 2 one embodiment of apparatus according to this invention, utilizing air as the carrier gas throughout, is provided with a rotary impact ice pulverizer having a drive motor and frame such as that shown in US. Patent 2,981,490 hereinbefore mentioned.
  • the apparatus frame 10 is built up from circular pipe lengths 11 as uprights and rectangular or square cross-section tubes 12 as horizontal members, several of which latter are broken away to better show the details of inter-component staying.
  • the pulverizer drive motor 16 is supported with drive shaft vertical by attachment to a channel member 17 (cut away vertically in FIG. 1), and the drive is via sheave 18, belt-connected to sheave l9 keyed to the pulverizer shaft 20. Inter-bracing of drive motor 16, frame 10 and the shaft housing 21 of the pulverizer is secured by turnbuckle fitting 22.
  • the pulverizer is suspended from horizontal I-beam supports 26 welded or otherwise attached to tubes 12, the housing indicated generally at 27 constituting both the impact pulverization zone and the classification chamber, whereas housing 28 immediately thereunder constitutes the fine product oiftake volute communicating, via connection flange 29, with a screening bag air exhausting auxiliary not shown.
  • a double-ended motor 30 is mounted with drive shaft upright so as to drive, at one shaft end, a suction fan 31 (FIG. 2) and, at the other shaft end, a similar classification air supply fan 32, shown only partially in broken line representation within air supply volute housing 33, through keyed connections at the two shaft ends.
  • the classification air supply line is duct 34, typically 6" inside diameter, opening into the intake of fan 32.
  • Classification air is delivered through duct 35 discharging into the annular air supply receiver 38 (FIG. 2) encircling housing 27, while ducts 39 are optionally provided for recycle of coarse pulverized solids to the impact pulverization zone.
  • Port 40 constitutes an inlet for fresh solids feed to the apparatus, it being understood, of course, that one or more of the ducts 39 may be disconnected to thereby afford additional fresh feed supply inlets if these are required in preference to recycle.
  • the impact pulverizer disk 45 consists of a generally circular imperforate plate fixedly attached to the lower end of shaft 20 by nut 46.
  • a multipilcity of radially disposed solids-directing vanes 47 are provided around the entire upper face of disk 45, which vanes not only impart high centrifugal energies to solids introduced to pulverization but also draw in a large amount of carrier air through port 40 as well as through ducts 39.
  • the actual pulverization is effected by solids impact, either direct or ricochet, against stationary pins 48 depending from stator ring 49, or against the lower encircling face 50 thereof.
  • An enhanced pulverizing effect is frequently obtained by provision of a row of rotating pins 51 integral with disk 45.
  • the inside periphery of air supply receiver 38 is provided around its entire circumference, at intervals in the range of about to 15, with a plurality of additional carrier gas supply louvers 55 (FIG. 4), typically fifty in number, each defined by a pair of pivotally mounted plates 56, which can all be adjusted simultaneously by provision of an interconnecting ring (not shown) shiftable manually from outside housing 27.
  • These louvers supply classification air from receiver 38 to classification chamber 57 along tangential lines.
  • the vortical flow of classification air is generally counter-clockwise, as viewed in top plan view, thereby matching the ascribed directions of rotation of disk 45 and fan 31, indicated by adjacent arrows. Obviously, these directions are a matter of choice and could be just as conveniently all opposite in sense.
  • annular plate 60 which is typically 2" wide x A" thick, tapered to the outside edge from the underside at an angle of about 15".
  • This plate is attached to the underside of pulverizer disk 45 by lugs 61, which lugs are preferably extended below plate 60 to support annular lower plate 62 defining the floor of chamber 57.
  • lugs 61 which lugs are preferably extended below plate 60 to support annular lower plate 62 defining the floor of chamber 57.
  • the periphery of plate 62 is machined to form short length air propulsion vanes 64 between which coarse solids thrown out from the impact pulverization, or ejected outwardly during classification, can both pass into a circularly extending trough 65, and thence via ducts 39 connected therewith to recycle.
  • vanes 64 of plate 62 and the vanes of fan 31 both apply moderate suction on the opposite sides of the labyrinth seal, thereby sweeping it clear of any particulate solids which might otherwise collect there, and at the same time keeping the air of the room in which the apparatus is located clean of the products of pulverization.
  • Relatively coarse non-entrained solid particles travel more or less 00- parallel to the surface of face 50 extended and quickly impinge on vanes 64, to be immediately ejected from housing 27 via trough and ducts 39 connecting therewith, thus being recycled through the impact pulverizer.
  • the finer particles resulting from the pulverization are entrained in the swirling carrier gas drawn into the pulverizer by vanes 47 and are further subjected to the high velocity vortical sweep of additional carrier gas, preferably supplied at about 0.1 to about 0.9 sonic velocity, introduced through louvers 55.
  • the fraction of fine particles resulting from the classification is concentrated centrally of the vortical flow and withdrawn from chamber 57 by fan 31, which delivers the fine product still entrained in air through the product delivery volute 36 encircling the inside of chamber 28 and thence via connection flange 29 to the nextfollowing equipment in sequence, usually a bag filter for product separation from the air stream.
  • the floor 62 for chamber 57 is preferably driven in rotation at the same speed as disk 45 and plate 69, so as to equalize the frictional drag on the vortically moving classification air as well as impel coarse material from chamber 57 by the rotation of vanes 64.
  • plate 62 can be made stationary if desired and, in fact, this latter arrangement is particularly advantageous Where a heavy, low tensile strength, extremely hard substance is used as a material of construction and, additionally, where a relatively coarse-grade central roduct of classification is desired.
  • the impact pulverizer proper is identical with that hereinbefore described with respect to the embodiment of FIGS. 1 and 2, and the several elements thereof are accordingly denoted by the same reference numerals.
  • the classification is entirely different and this is conducted within housing 74, substituted for housing 27 and all following equipment of the first embodiment.
  • Housing 74 is provided around the outside periphery with an annular steam chest 75, and the housing is drilled to receive evenly spaced outwardly disposed plugs 76 for convenience in assembling the inwardly oriented steam introduction nozzles 77 (typically 16 in number) mounted in line therewith, with longitudinal axes generally coparallel with the plane of disk 45.
  • Nozzles 77 discharge steam as the classification fluid into generally circular cross-section classification chamber 78, and a powerful vortical sweep is obtained by disposing the nozzles along lines tangential to a circle concentric with chamber 78, with outlets all disposed in a common sense preserving the swirl imparted to the carrier gas (air) drawn in by the impact pulverizer disk 45.
  • nozzles aligned 30 away from radii drawn from the center of chamber 78 gave good results.
  • the embodiment of apparatus shown in FIG. 3 is adapted to utilize steam at from about 90 to 300 lbs./ sq. in. gauge pressure, whereupon the introduction via nozzles 77 to chamber 78 is either at, or well above, sonic speeds. Under these conditions it is desirable to dispose the nozzle outlets somewhat farther outwards radially from the periphery of disk 45, and, accordingly, a ring 49' of somewhat greater terminal diameter than ring 47 is preferably substituted for the latter.
  • the remaining construction of the classifier is very similar to that already described for the first embodiment, incorporating a rotating chamber floor plate 79 suspended from circular cross-section lugs 80.
  • Floor plate 79 is not machined with peripheral air propulsion blades, such as blades 64, FIG. 2, nor is a coarse solids trough 65 incorporated in the design of FIG. 3, for the reason that recycle is not contemplated with this embodiment.
  • the finely pulverized product is swept off through central exhaust vent 82, which is in open communication with chamber 78 but offset therefrom 90, from whence it can be collected in a bag filter, or passed to other following equipment in train, in the same manner as hereinbefore described for the first embodiment.
  • a preloaded stiffening support for floor plate 79 can conveniently consist of four spokes 83 carried by a hub 85 and spaced apart one from another, which assembly is slipped on the end of shaft 20 before nut 46 is screwed on.
  • Spokes 83 are preferably round in cross-section at the inner and outer extremities, for lengths of approximately one diameter extent, and therebetween are machined to a rectangular cross-section such as indicated at 84, FIG. 6, disposed at an angle of approximately 45 with the longitudinal axis of the spokes.
  • the lengths 84 function as suction vanes in the course of rotation of spokes 83, assisting in the withdrawal of the fine classified fraction from chamber 78.
  • spokes 83 are proportioned such that the outboard ends abut the inside periphery of floor plate 79 with a tight shrink fit, facilitated by heating one part and cooling the other as conditions require, so that plate 79 and spokes 83 are, in effect, a single piece, even though not joined together. Consequently, when disk 45 is brought up to speed, carrying plate 79 with it, spokes 83 minimize flutter of the plate occasioned by the high rotational speeds and mechanical shocks resulting from impacts with particles, while also providing a portion of the torque-transmitting effort from shaft 20 to plate 79.
  • the underside of plate 79 is preferably machined with a plurality of concentric grooves 86 mating with the ends of upstanding ring portions 87 provided on the top face of stationary circular base member 88, thereby providing a labyrinth seal against steam and particle leakage from chamber 78.
  • Nozzles 77 can have a variety of designs, depending upon the velocities which are desired within classification chamber 78.
  • a straight cylindrical bore nozzle produces classification gas velocities in the approximately sonic range
  • a converging-diverging nozzle such as that shown in FIG. and covered in copending U.S. Patent application Ser. No. 189,927, which has now matured into US. Patent 3,178,121, is capable of introducing steam at velocities Well above sonic, such as, typically in the range of 2.2 times sonic for 300 p.s.i.g. steam and 1.8 times sonic for 150 p.s.i.g. steam.
  • the solids feed is introduced into the apparatus of FIG. 3 in the same manner as hereinbefore described for the embodiment of FIGS. 1, 2 and 4.
  • the classification is again effected by a vortically flowing additional carrier gas, in this case steam, but at considerably greater velocities than obtained with the air flow through louvers 55.
  • the classification is so efficient that the classification assistance plate 60 can be entirely dispensed with, centrifugal forces of the order of 20 10 to 180x10 times the force of gravity being applied to particles in entrainment, as distinguished from forces in the general range of only about 0.6 to 10 10 times gravity attained in the apparatus of FIGS. 1 and 2.
  • additional carrier gas in aid of classification can be supplied to the classification zone in a variety of ways, and that the louvers of FIG. 2 and the nozzles 77 of FIG. 3 are each to be considered representative, and not restrictive. It is also practicable to utilize diverse gas introduction means, such as, for example, one or more steam nozzles 77 interspersed with air louvers 55, or the like, so that precise preselected velocity or temperature patterns can be preserved within the classification zone, as where temperature-sensitive materials are being processed or where a concomitant steam distillation effect removing adhering solvent from particulate solids is advantageous. This readily enables the use of two or more different gases as components of the additional carrier gas, which can be highly desirable.
  • a completely unanticipated advantage derived from impact pulverization-classification according to this invention is the marked increase in efficiency in the over-all pulverization effort as compared to that obtained where impact pulverization and classification are conducted as separate operations. This is displayed in greatly improved uniformity of particle size in the products obtained and also in the power required for a given degree of pulverization. Hence, the immediate, essentially complete removal of fine particle solids with elimination of their dwell within, as well as their return to, the pulverization zone frees the coarse material from any accompanying burden of energy-absorbing fines which could interfere with the maximum application of energy to pulverization per se.
  • this gas can be supplied in whole or in part, and singly or collectively, by air drawn in from the room through port 40, air reinjected into the pulverization zone via recycle ducts 39, or even by gas introduced from entirely different sources, as might be required where inert atmospheric blanketing of operations is essential.
  • the apparatus can, in fact, be completely sealed off, so that the carrier gas is then supplied exclusively internally by return flow adjacent ring face 50.
  • introduction of carrier gas to the pulverization section is, of course, completely independent of raw or recycle solids feed to the apparatus, the only requirement being that the carrier gas in this section proceed radially outward of the impact rotor together with any solids in course of pulverization.
  • a method of impact pulverization-classification of solids comprising, in sequence, subjecting said solids to centrifugal impact pulverization in the presence of a concurrently flowing stream of carrier gas, thereby effecting the throwout of coarse pulverized solids by the combined effects of centrifugal force and gravity and the entrainment of fine dispersed pulverized solids in said carrier gas, introducing an additional quantity of carrier gas in co-rotational vortical flow to the carrier gas entraining said fine dispersed pulverized solids in sufficient quantity to effect a classification of said dispersed pulverized solids into a first fraction of fine particle size concentrated centrally of said vortical flow and a second fraction of coarse particle size concentrated peripherally of said vortical flow, and withdrawing at least said first fraction as a separate pulverized product.
  • a method of impact pulverization-classification of solids comprising, in sequence, subjecting said solids to centrifugal impact pulverization in the presence of a concurrently fiowing stream of carrier gas, thereby effecting the throwout of coarse pulverized solids by the combined effects of centrifugal force and gravity and the entrainment of fine dispersed pulverized solids in said carrier gas, introducing an additional quantity of carrier gas in co-rotational vortical flow to the carrier gas entraining said fine dispersed pulverized solids in sufficient quantity to effect a classification of said dispersed pulverized solids into a first fraction of fine particle size concentrated centrally of said vortical flow and a second fraction of coarse particle size concentrated peripherally of said vortical flow, and withdrawing said first fraction and said second fraction as separate pulverized products.
  • a method of impact pulverization-classification of solids comprising, in sequence, subjecting said solids to centrifugal impact pulverization in the presence of a concurrently fiowing stream of carrier gas, thereby effecting throwout of coarse pulverized solids by the combined effects of centrifugal force and gravity and entrainment of fine dispersed pulverized solids in said carrier gas, introducing at a plurality of points spaced not in excess of about 15 one from another around the periphery of the zone receiving said fine dispersed solids in said carrier gas and at a velocity within the range of about 0.1 to about 0.9 sonic velocity an additional quantity of carrier gas in co-rotational vortical flow to the carrier gas entraining said fine dispersed pulverized solids in sufficient quantity to effect a classification of said dispersed pulverized solids into a first fraction of fine particle size concentrated centrally of said vortical flow and a second fraction of coarse particle size concentrated peripherally of said vortical flow, and withdrawing said first fraction
  • a method of impact pulverization-classification of solids comprising, in sequence, subjecting said solids to centrifugal impact pulverization in the presence of a concurrently fiowing stream of carrier gas, thereby effecting throwout of coarse pulverized solids by the combined effects of centrifugal force and gravity and entrainment of fine dispersed pulverized solids in said carrier gas, introducing an additional quantity of carrier gas at substantially sonic velocity or above in co-rotational vortical flow to the carrier gas entraining said fine dispersed pulverized solids in suflicient quantity to effect a classification of said dispersed pulverized solids into a first fraction of fine particle size concentrated centrally of said vortical flow and a second fraction of coarse particle size concentrated peripherally of said vortical flow, and withdrawing at least said first fraction as a separate pulverized product.
  • An apparatus for impact pulverization-classification of solids comprising, in combination, (1) a centrifugal impact mill incorporating a power-driven rotary pulverizer disk provided on its outboard surface with radially disposed solids-directing vanes imparting extreme centrifugal force loadings to solids moved therepast mounted generally co-axial with respect to a stator ring having an axially oriented face encircling the periphery of said pulverizer disk at close clearance therewith, means for introducing solids to be pulverized, and means for introducing carrier gas in concurrent fioW with said solids radially outward past the vanes of said pulverizer disk, and (2) a generally circular cross-section chamber disposed axially adjacent of and in open endwise communication with the interspace between said stator ring and the periphery of said pulverizer disk, said chamber being provided with a centrally disposed port on the end remote from the inboard surface of said pulverizer disk for the withdrawal of fine pulverized solids
  • An apparatus for impact pulverization-classification of solids comprising, in combination, (1) a centrifugal impact mill incorporating a power-driven rotary pulverizer disk provided on its outboard surface with radially disposed solids-directing vanes imparting extreme centrifugal force loadings to solids moved therepast mounted generally coaxial with respect to a stator ring having an axially oriented face encircling the periphery of said pulverizer disk at close clearance therewith, means for intro ducing solids to be pulverized, and means for introducing carrier gas in concurrent flow with said solids radially outward past the vanes of said pulverizer disk, and (2) a generally circular cross-section chamber disposed axially adjacent of and in open endwise communication with the interspace between said stator ring and the periphery of said pulverizer disk, said chamber being provided with a peripherally disposed port for the withdrawal of coarse pulverized solids thrown out from said pulverizer disk and a centrally disposed
  • An apparatus for impact pulverizadon-classification of solids comprising, in combination, (1) a centrifugal impact mill incorporating a power-driven rotary pulverizer disk provided on its out-board surface with radially disposed solids-directing vanes imparting extreme centrifugal force loadings to solids moved therepast mounted generally co-axial with respect to a stator ring having an axially oriented face encircling the periphery of said pulverizer disk at close clearance therewith, means for introducing solids to be pulverized, and means for introducing carrier gas in concurrent fiow with said solids radially outward past the vanes of said pulverizer disk, and (2) a generally circular cross-section chamber disposed axially adjacent of and in open endwise communication with the interspace between said stator ring and the periphery of said pulverizer disk, said chamber being provided with a peripherally disposed port for the withdrawal of coarse pulverized solids thrown out from said pulverizer disk and an end wall remote
  • An apparatus for impact pulverization-classification of solids comprising, in combination, (1) a centrifugal impact mill incorporating a power-driven rotary pulverizer disk provided on its outboard surface with radially disposed solids-directing vanes imparting extreme centrifugal force loadings to solids moved t-herepast mounted generally co-axial with respect to a stator ring having an axially oriented face encircling the periphery of said pulverizer disk at close clearance therewith, means for introducing solids to be pulverized, and means for introducing carrier gas in concurrent flow with said solids radially outward past the vanes of said pulverizer disk, and (2) a generally circular cross-section chamber disposed axially adjacent of and in open endwise communication with the interspace between said stator ring and the periphery of said pulverizer disk, said chamber being provided with a peripherally disposed port for the withdrawal of coarse pulverized solids thrown out from said pulverizer disk and an end wall
  • An apparatus for impact pulverization-classification of solids wherein said chamber is further provided with a flat plate classification element interposed intermediate said inboard surface of said pulverizer disk and said annular plate driven in rotation co-directional with said pulverizer disk of said impact mill, said flat plate classification element being also driven in rotation co-directional with said pulverizer disk of said impact mill.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Combined Means For Separation Of Solids (AREA)
  • Disintegrating Or Milling (AREA)
  • Crushing And Grinding (AREA)
  • Cyclones (AREA)
US190761A 1962-04-27 1962-04-27 Impact pulverization-classification Expired - Lifetime US3224686A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
BE631610D BE631610A (en, 2012) 1962-04-27
US190761A US3224686A (en) 1962-04-27 1962-04-27 Impact pulverization-classification
CH484963A CH400733A (fr) 1962-04-27 1963-04-18 Procédé de traitement de matières solides et appareil pour la mise en oeuvre de ce procédé
FR932357A FR1355213A (fr) 1962-04-27 1963-04-23 Perfectionnements aux procédés et aux appareils du pulvérisation par choc et de classement
GB16306/63A GB958484A (en) 1962-04-27 1963-04-25 Method and apparatus for impact pulverisation-classification
DEP31687A DE1291604B (de) 1962-04-27 1963-04-27 Sichtermuehle

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US190761A US3224686A (en) 1962-04-27 1962-04-27 Impact pulverization-classification

Publications (1)

Publication Number Publication Date
US3224686A true US3224686A (en) 1965-12-21

Family

ID=22702652

Family Applications (1)

Application Number Title Priority Date Filing Date
US190761A Expired - Lifetime US3224686A (en) 1962-04-27 1962-04-27 Impact pulverization-classification

Country Status (6)

Country Link
US (1) US3224686A (en, 2012)
BE (1) BE631610A (en, 2012)
CH (1) CH400733A (en, 2012)
DE (1) DE1291604B (en, 2012)
FR (1) FR1355213A (en, 2012)
GB (1) GB958484A (en, 2012)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3468489A (en) * 1965-10-22 1969-09-23 Norwood H Andrews Comminuting apparatus
US3472459A (en) * 1965-03-08 1969-10-14 Degussa Process for the production of silicas suitable for matting of lacquers and plastic materials
US3528915A (en) * 1969-02-28 1970-09-15 Titan Products Co Titaniferous biotite lubricant
US3599880A (en) * 1969-03-24 1971-08-17 Du Pont Lead-chromate-based pigment
US5690284A (en) * 1991-01-09 1997-11-25 Qed International Limited Method and apparatus for grinding
WO2004067468A1 (en) * 2003-01-29 2004-08-12 John Hugo Nellmapius Increased repla cement of fly ash in cement compositions
RU2310510C2 (ru) * 2006-01-10 2007-11-20 Федеральное государственное унитарное предприятие "Научно-исследовательский институт полимерных материалов" Способ измельчения твердых материалов

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4238445A (en) * 1979-07-02 1980-12-09 United States Gypsum Company Process for manufacturing gypsum board
DE9005091U1 (de) * 1990-05-04 1990-07-12 F.B. Lehmann Maschinenfabrik Gmbh, 7080 Aalen Wurfbrecher, insbesondere für Kakaobohnen
CA2061255A1 (en) * 1991-02-15 1992-08-16 Ronald Frederick Bourne Treatment of particulate material
CN111468241B (zh) * 2020-05-26 2024-09-17 东北林业大学 一种高速冲击式生物质秸秆超细粉碎装置

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1159122A (en) * 1912-05-09 1915-11-02 Charles J Reilly Pulverizing and separating machine.
US2092307A (en) * 1935-06-20 1937-09-07 Peabody Engineering Corp Pulverizer
US2342255A (en) * 1943-08-30 1944-02-22 Lawrence N Doyle Pulverizer
US3015391A (en) * 1960-02-24 1962-01-02 Sharples Corp Classification process and apparatus
US3023973A (en) * 1959-03-17 1962-03-06 Entoleter Centrifugal impacting apparatus

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB196487A (en, 2012) * 1900-01-01
US654294A (en) * 1900-01-02 1900-07-24 Farben Fabriken Of Elberfeld Company Blue anthraquinone dye and method of making same.
DE619750C (de) * 1932-08-07 1935-10-05 Kohlenscheidungs Ges M B H Mahlanlage
FR988011A (fr) * 1942-09-07 1951-08-22 Internat Pulverizing Corp Perfectionnements apportés aux appareils broyeurs ou pulvériseurs
DE941585C (de) * 1943-07-04 1956-04-12 Arno Andreas Prallmuehle mit einem zum Schleudern dienenden Umlaeufer hoher Drehzahl
DE863284C (de) * 1948-12-28 1953-01-15 Alpine Aktien Ges Eisengiesser Mahlsichtaggregat
DE846503C (de) * 1950-02-08 1952-08-14 Kosmos Ges Fuer Internationale Prallmuehle mit Prallring und senkrechter Welle fuer verschiedenartiges Mahlgut
DE954473C (de) * 1952-08-16 1956-12-20 Basf Ag Mahlvorrichtung
US2963230A (en) * 1954-06-30 1960-12-06 Microcyclomat Co Dry material pulverizer with integral classifier
CH349475A (de) * 1955-02-14 1960-10-15 Lecher Joseph Zerkleinerungsgerät zum Herabsetzen der Korngrösse von Partikeln aus festem Material

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1159122A (en) * 1912-05-09 1915-11-02 Charles J Reilly Pulverizing and separating machine.
US2092307A (en) * 1935-06-20 1937-09-07 Peabody Engineering Corp Pulverizer
US2342255A (en) * 1943-08-30 1944-02-22 Lawrence N Doyle Pulverizer
US3023973A (en) * 1959-03-17 1962-03-06 Entoleter Centrifugal impacting apparatus
US3015391A (en) * 1960-02-24 1962-01-02 Sharples Corp Classification process and apparatus

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3472459A (en) * 1965-03-08 1969-10-14 Degussa Process for the production of silicas suitable for matting of lacquers and plastic materials
US3468489A (en) * 1965-10-22 1969-09-23 Norwood H Andrews Comminuting apparatus
US3528915A (en) * 1969-02-28 1970-09-15 Titan Products Co Titaniferous biotite lubricant
US3599880A (en) * 1969-03-24 1971-08-17 Du Pont Lead-chromate-based pigment
US5690284A (en) * 1991-01-09 1997-11-25 Qed International Limited Method and apparatus for grinding
WO2004067468A1 (en) * 2003-01-29 2004-08-12 John Hugo Nellmapius Increased repla cement of fly ash in cement compositions
RU2310510C2 (ru) * 2006-01-10 2007-11-20 Федеральное государственное унитарное предприятие "Научно-исследовательский институт полимерных материалов" Способ измельчения твердых материалов

Also Published As

Publication number Publication date
GB958484A (en) 1964-05-21
FR1355213A (fr) 1964-03-13
DE1291604B (de) 1969-03-27
CH400733A (fr) 1965-10-15
BE631610A (en, 2012)

Similar Documents

Publication Publication Date Title
US3224686A (en) Impact pulverization-classification
US4504017A (en) Apparatus for comminuting materials to extremely fine size using a circulating stream jet mill and a discrete but interconnected and interdependent rotating anvil-jet impact mill
CN105536957A (zh) 一种叶轮及超细粉磨机、超细粉磨系统
US2304264A (en) Apparatus for pulverizing and classifying materials
CN115672511B (zh) 一种根茎类中药超微粉碎系统
US5542615A (en) Pulverizing appratus
US3565348A (en) Fluid-energy mill and process
US3815833A (en) Method and apparatus for grinding thermoplastic material
US2164409A (en) Fine grinding
US3881664A (en) Wear plate in an apparatus for conditioning a granular material
US3348779A (en) Method and apparatus for comminuting materials
US3610542A (en) Pulverizer
US2754967A (en) Centripetal classifier
US2762572A (en) Apparatus for disintegrating and classifying dry materials
CN103191813A (zh) 一种改良的流化床气流粉碎机
JPS63319067A (ja) 水平旋回流型ジェットミル
US3468489A (en) Comminuting apparatus
CN203437172U (zh) 一种流化床气流粉碎机
JPS5973065A (ja) 超微粉砕機
JP2918679B2 (ja) 乾式媒体ミル
JPH01502802A (ja) 圧力室粉砕機の粉砕効率改良のための方法と装置
SU1036365A1 (ru) Мельница ударного действи
US2951648A (en) Milling apparatus
SU973156A1 (ru) Центробежно-ударна мельница
CN207735107U (zh) 一种涡流分级轮和包括其的粉碎设备