US3536266A - Apparatus for continuously dispersing suspensions of solid articles - Google Patents

Apparatus for continuously dispersing suspensions of solid articles Download PDF

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Publication number
US3536266A
US3536266A US689429A US3536266DA US3536266A US 3536266 A US3536266 A US 3536266A US 689429 A US689429 A US 689429A US 3536266D A US3536266D A US 3536266DA US 3536266 A US3536266 A US 3536266A
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United States
Prior art keywords
vessel
suspension
particles
grinding particles
dispersing
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Expired - Lifetime
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US689429A
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English (en)
Inventor
Jan Kaspar
Vladislav Bicik
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/50—Mixing liquids with solids
    • B01F23/53—Mixing liquids with solids using driven stirrers
    • 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
    • B01F27/60—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis
    • B01F27/73—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis with rotary discs
    • 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
    • B02C17/16—Mills in which a fixed container houses stirring means tumbling the charge
    • B02C17/161—Arrangements for separating milling media and ground material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C7/00—Crushing or disintegrating by disc mills
    • B02C7/11—Details
    • B02C7/16—Driving mechanisms

Definitions

  • the aforementioned system of plates may, according to another embodiment of the invention, be located in a particular extension forming a portion of said vessel and communicating therewith, the rotary circular plate being keyed on a separate shaft having its own drive and being received in said extension.
  • the rotary circular plate has a diameter which is smaller or at the most the same as the diameter of said agitating discs, and is positioned relative to the stationary annular disc at the side of the mixture of the suspension and the dispersing corpuscles.
  • the present invention relates to -a dispersing apparatus in general, and to an apparatus for continuously dispersing solid particles up to colloidal fineness, in particular, wherein the dispersing corpuscles are separated from the suspension by means of a special separating device hereinafter referred to as dyamic separator.
  • Well-known apparatuses for continuously dispersing solid particles comprise a sealed vessel in which there is axially arranged a rotary shaft having a set of spaced agitating discs secured thereto and rotating at a relatively high circumferential speed.
  • the interior of the vessel is partially filled up with auxiliary grinding particles, the grain size of which being three milimeters at the most.
  • the axis of the vessel as well as of the shaft lies as a rule in a horizontal plane or in a plane declined therefrom at any angle up to 45 degrees.
  • the position of the vessel axis as hereinbefore referred to possesses an advantage over arrangements having their axes oriented vertically, consisting in a higher grinding efficiency resulting from different physical conditions.
  • the main drawback of the arrangements used heretofore consists in that the suspensions have to pass, when being discharged, through screen or other filtering inserts or paddings which at high flow rates, particularly with suspensions having relatively high viscosity values, are liable to be clogged.
  • auxiliary separating means hereinafter referred to as dynamic separap 4 3,536,266 1C6 Patented Oct. 27, 1970 tor designed for separating the grinding particles from the suspension to be processed, which separator being disposed adjacent the outlet portion of the dispersing vessel.
  • the dynamic separator By means of the said dynamic separator it is possible to prepare suspensions containing particles of colloidal finesness.
  • the dispersing effect is attained by combining impact and friction action of the auxiliary grinding particles which are together with the suspension subject to a thorough permanent agitation and which simultaneously are moved on stream-lined paths through the suspension volume.
  • the starting stock to be processed is constituted by mixtures of solid particles having grain sizes ranging between 0.01 and one milimeter, and a liquid component.
  • this additional device for separating the grinding particles from the suspension makes possible to cast the same back into the operating space of vessel, the grinding particles being caught by said device and then remixed with the suspension.
  • the apparatus according to the invention equipped with the aforementioned dynamic separator for separating the grinding particles can be used for processing even highly viscous suspensions regardless of their rheological characteristics, and without any problems being encountered with the discharge of the suspension and with separation of the grinding particles from the suspension. It is particularly suitable for the preparation of fine suspensions of dyestuffs, chemical compounds, and the like.
  • FIG. 1 shows an axial section of a known arrangement of a continuously operating dispersing apparatus, comprising a screen as detention means for grinding particles through which screen the suspension is discharged;
  • FIG. 2 shows an axial section of a preferred embodiment of the apparatus according to the invention, the additional separating device or dynamic separator being disposed in an extension room;
  • FIG. 3 shows an axial section of an alternate embodiment of the apparatus according to the invention, the dynamic separator being located in the dispersing vessel itself.
  • FIG. 1 a conventionally used apparatus for dispersing suspension of solid particles com prises a cylindrical sealed vessel provided with covers, a neck 1 for supplying the suspension, a shaft coaxially arranged therein and carrying a plurality of spaced agitating discs to rotate in the vessel, and with an outlet portion, wherein the suspension is discharged through a screen or filter 2 into a delivery tube 3.
  • FIG. 2 there is shown a preferred embodiment of the apparatus according to the invention, wherein the reference numeral '4 designates the cylindrical vessel containing the grinding particles P, 6 the coaxial shaft in the vessel, and 5 a set of spaced agitating discs designed for agitating the suspension charge in the vessel as well as the grinding particles located therein.
  • the entering shaft portion is sealed by means of a gasket 8.
  • 7 designates the supply neck or inlet means for the suspension.
  • the axis of the vessel is preferably disposed in a horizontal plane or in a plane declined therefrom at any angle up to 45 degrees.
  • the vessel is partially filled up with the suspension to be processed and with a charge of auxiliary grinding particles taking 40 to 60 percent of the entire vessel capacity, the grain size of the grinding particles being three millimeters at the most, preferably 0.25 to one millimeter.
  • the agitating discs have a diameter amounting 50 to 95 percent of the inner vessel diameter.
  • the shaft 6 together with the agitating discs 5 secured thereon is adapted to rotate at a relatively high circumferential speed of 8 m./sec.
  • the separation of the grinding particles from the suspension is carried out by means of an additional separating device or dynamic separator constituting a feature of the present invention.
  • the dynamic separator is located in a special extension 15 provided adjacent the outlet portion of the dispersing vessel 4 and communicates with the interior thereof; it comprises two plates, a rotary circular plate 10 in form of a flattened cylindrical body adapted to rotate together with a separate shaft 13 arranged coaxially in said extension 15 and provided with its own driving means 14, and a stationary annular plate 9 secured at its external circumferential portion to the inner wall of said extension 15.
  • the diameter of the rotary circular plate 10 is preferably larger than that of the central opening provided in the stationary annular plate 9, and the same or smaller than the diameter of said agitating discs 5. Between the two plates 10 and 9 there is provided an axial gap of which the thickness corresponds to -70 percent 0 of grain size of the smallest grinding particles used.
  • the cylindrical surface of the rotary circular plate 10 is designated in FIG. 2 by numeral 12.
  • One of the novel features of the present invention consists in that the rotary circular plate 10 is positioned, relative to the stationary annular plate 9, at the side of the mixture of the grinding particles and the suspension of solid particles.
  • the reference numeral 11 designates the delivery tube or outlet means.
  • FIG. 3 Another embodiment of the apparatus according to the invention is shown in FIG. 3.
  • the dynamic separator is provided in the very interior of the dispersing vessel 4 and comprises similarly the rotary circular plate 10 having a cylindrical surface 12, and the stationary annular plate 9.
  • the rotary plate 10 is secured directly on the shaft 6 of the agitator while the stationary plate 9 is supported on the inner Wall of the vessel 4.
  • the apparatus according to the invention operates as follows:
  • a suspension of milled material is supplied through the supply neck into the interior of the dispersing vessel where it is intensively agitated together with the auxiliary grinding particles.
  • a desirable dispersing effect is attained by a combined impact and friction action of the grinding particles which are moved in the vessel content along streamlined paths.
  • the whole vessel capacity is uniformly filled up with the grinding particles and the suspension.
  • the milled material is led successively from the supply neck towards the outlet portion of the vessel where a separation of the suspension from the auxiliary grinding particles by means of an additional separating device or dynamic separator takes place.
  • the mixture of the suspension and the auxiliary particles reaches the space adjacent the cylindrical surfaces of the rotary circular plate of the dynamic separator. Due to the rotation thereof the grinding particles are partially separated from the suspension on said cylindrical surface so that the gap between the rotary and the stationary plate is fed with the suspension already partially freed from the grinding particles. Thus the total separating efficiency of the dynamic separator is greater than if depending solely upon the action of the gap between the plates. Due to the permanent agitation the grinding particles detained by the separator are continuously returned back into the operating space of the vessel. Said partial separation of the grinding particles from the suspension already on the cylindrical surface of the rotary circular plate influences desirably the rate of remixing these particles back into the suspension.
  • the suspension after having passed the dynamic separator is kept by agitating in permanent movement and in fluid state. Due to the continuous rotation of the circular plate the suspension is kept in permanent movement in the gap zone, which movement contributes to a considerable extent lest even highly viscous suspensions, with their rheological characteristics in view, might lose the fluidity. In this way the passage of the processed suspension through the gap is facilitated, and the tendency of the rather narrow passage between the plates of getting choked may be suppressed unlike with screens or similar filtering means.
  • Apparatus for continuously grinding solid particles to colloidal fineness and for dispersing said particles in a liquid comprising, in combination, a substantially closed cylindrical vessel having opposite ends and being provided in the region of said opposite ends With inlet and outlet means for respectively supplying to the interior of said vessel a suspension of said solid particles in a liquid and for discharging a suspension with particles of reduced size therefrom; grinding particles in the interior of said vessel; means for agitating said suspension and said grinding particles in the interior of said vessels; and means upstream of said outlet means for separating said grinding particles from said suspension and for preventing discharge of said grinding particles from the interior of said vessel, said separating means comprising a stationary annular plate fixed to said vessel upstream of said outlet means and a rotary plate axially displaced in a direction away from said outlet means with regard to said annular stationary plate, said rotary plate having an outer diameter greater than the inner diameter of said annular plate and said plates having respectively overlapping annular front and rear face portions parallel to each other and substantially normal to the axis of rotation of
  • said agitating means comprise a drive shaft substantially coaxial with the axis of said cylindrical vessel and a plu rality of circular disks axially spaced from each other and coaxially fixed to said drive shaft for rotation therewith, said disks having peripheral surfaces spaced from the inner surface of said vessel.
  • said vessel is provided at the end thereof distant from said inlet means with a hollow extension extending transverse to the axis of said vessel, said extension having an outer end, said outlet means communicating with the interior of said extension in the region of said outer end, said annular plate being fixed in the interior of said extension inwardly spaced from said outer end and said rotary plate being axially spaced from said annular plate in a direction away from said outer end of said extension.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Dispersion Chemistry (AREA)
  • Crushing And Grinding (AREA)
  • Mixers Of The Rotary Stirring Type (AREA)
US689429A 1966-12-12 1967-12-11 Apparatus for continuously dispersing suspensions of solid articles Expired - Lifetime US3536266A (en)

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Application Number Priority Date Filing Date Title
CS789866 1966-12-12

Publications (1)

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US3536266A true US3536266A (en) 1970-10-27

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Country Status (6)

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US (1) US3536266A (de)
AT (1) AT281771B (de)
CH (1) CH472912A (de)
DE (1) DE1607615A1 (de)
GB (1) GB1209618A (de)
NL (1) NL6716902A (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3904133A (en) * 1973-09-28 1975-09-09 Netzsch Maschinenfabrik Separation device for separating grinding elements and ground suspension in an agitator mill
US4534516A (en) * 1981-03-16 1985-08-13 Iwao Hashizume Dynamic separator for a grinding mill
RU2585466C1 (ru) * 2015-02-26 2016-05-27 Закрытое акционерное общество "Путь 910" Способ получения активированной суспензии с использованием дискового измельчителя

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3245825C2 (de) * 1982-12-10 1994-01-27 Buehler Ag Geb Rührwerksmühle
CN111805388B (zh) * 2020-07-27 2022-01-18 湖北灿业科技有限公司 一种机械零部件加工用原材料块打磨除锈装置

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1342334A (fr) * 1962-09-29 1963-11-08 L Delplanque & Fils Ets Perfectionnement aux broyeurs à billes
US3164330A (en) * 1960-09-06 1965-01-05 Neidl Georg Rotary-pump apparatus
US3298618A (en) * 1963-10-17 1967-01-17 Du Pont Dispersing apparatus
US3311310A (en) * 1964-06-20 1967-03-28 Draiswerke Gmbh Stirring mill
US3327953A (en) * 1964-09-09 1967-06-27 Chicago Boiler Company Sealing means for rotary agitator of a grinding and dispersing mill
US3432109A (en) * 1964-01-18 1969-03-11 Netzsch Mas Fab Geb Machine for dispersing and comminuting flowable materials

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3164330A (en) * 1960-09-06 1965-01-05 Neidl Georg Rotary-pump apparatus
FR1342334A (fr) * 1962-09-29 1963-11-08 L Delplanque & Fils Ets Perfectionnement aux broyeurs à billes
US3298618A (en) * 1963-10-17 1967-01-17 Du Pont Dispersing apparatus
US3432109A (en) * 1964-01-18 1969-03-11 Netzsch Mas Fab Geb Machine for dispersing and comminuting flowable materials
US3311310A (en) * 1964-06-20 1967-03-28 Draiswerke Gmbh Stirring mill
US3327953A (en) * 1964-09-09 1967-06-27 Chicago Boiler Company Sealing means for rotary agitator of a grinding and dispersing mill

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3904133A (en) * 1973-09-28 1975-09-09 Netzsch Maschinenfabrik Separation device for separating grinding elements and ground suspension in an agitator mill
US4534516A (en) * 1981-03-16 1985-08-13 Iwao Hashizume Dynamic separator for a grinding mill
RU2585466C1 (ru) * 2015-02-26 2016-05-27 Закрытое акционерное общество "Путь 910" Способ получения активированной суспензии с использованием дискового измельчителя

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Publication number Publication date
CH472912A (de) 1969-05-31
NL6716902A (de) 1968-06-13
GB1209618A (en) 1970-10-21
DE1607615A1 (de) 1970-07-09
AT281771B (de) 1970-06-10

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