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US3204880A - Method and apparatus for grinding solid particles - Google Patents

Method and apparatus for grinding solid particles Download PDF

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Publication number
US3204880A
US3204880A US261649A US26164963A US3204880A US 3204880 A US3204880 A US 3204880A US 261649 A US261649 A US 261649A US 26164963 A US26164963 A US 26164963A US 3204880 A US3204880 A US 3204880A
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US
United States
Prior art keywords
tank
grinder
receptacle
grinding
pump
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
US261649A
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English (en)
Inventor
Ernest R Haller
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.)
Stecco SA De Tech Chimique
STECCO TECHNIQUE CHIMIQUE SA
Original Assignee
Stecco SA De Tech Chimique
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 Stecco SA De Tech Chimique filed Critical Stecco SA De Tech Chimique
Application granted granted Critical
Publication of US3204880A publication Critical patent/US3204880A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B02C19/00—Other disintegrating devices or methods
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C21/00—Disintegrating plant with or without drying of the material
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
    • C09B67/00—Influencing the physical, e.g. the dyeing or printing properties of dyestuffs without chemical reactions, e.g. by treating with solvents grinding or grinding assistants, coating of pigments or dyes; Process features in the making of dyestuff preparations; Dyestuff preparations of a special physical nature, e.g. tablets, films
    • C09B67/0001—Post-treatment of organic pigments or dyes
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK  ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
    • C09C3/00—Treatment in general of inorganic materials, other than fibrous fillers, to enhance their pigmenting or filling properties
    • C09C3/04—Physical treatment, e.g. grinding, treatment with ultrasonic vibrations
    • C09C3/041—Grinding
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2004/00—Particle morphology
    • C01P2004/50—Agglomerated particles
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2006/00—Physical properties of inorganic compounds
    • C01P2006/60—Optical properties, e.g. expressed in CIELAB-values

Definitions

  • the present invention has for its object, in a method of grinding utilizing a number of discontinuous passes, to limit the above drawbacks and to provide the advantages of operation with continuous re-cycling, with a more uniform granular size.
  • the invention ischaracterized in that, in the grinding machine in continuous operation, distinct successive passes of the whole of the material to be ground are carried out, these passes being initiated automatically, following a pre-determined programme.
  • a fresh pass into the grinding machine can only be started after the whole of the "material ground during the preceding pass has passed passes producing its appropriate degree of fineness. It is therefore by a sequence of discontinuous operations that complete grinding is obtained. These operations are however carried out automatically without any manual action, so that there is obtained in this way an automatic cycling by discontinuous passes.
  • the automatic operation of the successive passes in accordance with the pre-established programme is effected by a set of valves operated by relays actuated according to the indications of level-indicators in the tanks which receive the material under treatment.
  • This material normally in the form of a dispersion in an appropriateliquid, is handled by pumps, and the set of valves according to the programme provides the suit able successive circuits which bring the dispersion to the grinding machine.
  • FIG. 1 is a general view in perspective of the grinding installation.
  • FIG. 2 is a View in cross-section of a tank of FIG. 1.
  • FIG. 3 is a diagram explaining the manner in which the successive passes are carried out.
  • FIG. 4 shows the arrangement of the electrical equipment which controls the circulation channels.
  • This installation is essentially composed of a grinding machine 1 and three tanks 2, 3 and 4.
  • the grinder 1 can be of any conventional type with balls, discs, cylinder, sand, etc.
  • this grinder is of the vertical-shaft type mounted on a support 5 and driven by a motor 6 which is mounted on the frame 7.
  • the tank 2 which will subsequently be known as the pre-mixing tank, is provided with a two-speed agitator 8, driven by a reduction gear 9.
  • Each of the tanks is equipped substantially as shown in FIG. 2.
  • the latter shows a cross-section of the premixing tank 2.
  • a casing 14 providing for a circulation of cooling water; 15 is the water inlet and 16 is its outlet.
  • the evacuation pipe 18 In the vicinity of the domed bottom 17 are arranged on the one hand the evacuation pipe 18 to which is connected the piping from the circulation pump, and on the other hand the pipe 19 of the rinsing valve.
  • the filling pipe has its outlet at 20.
  • An intermediate tank 21 (FIGS. 1 and 3) is associated with the grinding machine 1.
  • This tank intended to receive the product passing out of the grinder through the overflow outlet 22, comprises at 23 a filter intended to retain the balls or the grinding sand which may be carried away with the ground material.
  • the circulation of the material to be ground is effected by two pumps 24 and 25, driven by a motor group 26.
  • On the drive of the pump 25 is provided an electro-magnetic clutch 56.
  • the suction of the pump 24 is coupled through a piping 27, on the one hand at 28 to the tank 2 and on the other hand at 29 to the tank 3.
  • Valves 30 and 31 are respectively arranged on the pipes 28 and 29.
  • This pipe 32 is provided with a stop-valve 33.
  • the pump 25 is under the head due to the intermediate tank 21 through the pipe 34.
  • This pump 25 delivers into the piping 35, which is provided at 36 with a threeway device which directs the'circulating material into one of the pipes 37, 38 or 39; 37 to the tank 2, 38 to the tank 3 and 39 to the tank 4.
  • the device 36 may be arranged so as to ensure the orientation of the circulation. This orientation can however also be obtained by means of valves 40, '41 and 42, provided on the piping systems 37, 38 and 39.
  • valves The control of the various valves is effected automatically by a series of electric contacts. These valves are preferably of the diaphragm type actuated by compressed air and controlled by electric relays. The whole of the control of the valves is effected by a programming device. The initiation and control of the operations are effected from a control desk 43 (FIG. '1).
  • the cycle of the operations and the control of the circulation are operated by electric probes mounted in the tanks 2, 3 and 21.
  • the tank 2 is provided with two probes 44 and 45; the probe 44 in the vicinity of the bot tom of the tank (FIGS. 2 and 3), the probe 45 below the level of the agitator 8.
  • the tank 3 is provided with a probe 46 close to the bottom.
  • the tank 21 has two probes 47 and 48, one close to the bottom and the other at the upper portion.
  • the probes 44 and 46 control the starting of a motor 49 (FIG. 4), the shaft of which is provided with a succession of earns 50, 51, 52 and 53.
  • the probe 45 stops the motor of the agitator 8 when the level falls below that of the agitator.
  • the probes 47 and 48 control the electro-magnetic clutch 56 of the .pump 25.
  • Each of the cams is in contact with the push-rod 54 of a contact 55, as shown by the broken away portion of the contact of the cam 50. These contacts operate the relays which control the actuation of the valves.
  • the tank 2 is filled with this suspension.
  • the suspension is first deflocculated by putting the agitator 8 into action at high speed.
  • an automatic time-switch changes the agitator to low speed and then stops it until the froth which may have formed has subsided.
  • the pump 24 is started-up and the valve 30 is automatically opened.
  • the pump sucks-in the suspension and delivers it into the grinding machine 1.
  • the tank 2 thus empties gradually.
  • the probe 45 When its level has reached the probe 45, the latter operates the stopping of the agitator 8.
  • the programming device comes into action and reverses the circuit.
  • valves 30 and 41 are closed, the valves 31 and 40 are opened. This opening is effected by rotation through half a revolution of the cams 50 to 53 which actuate the contacts 55.
  • the tank 2 is again filled and the tank 3 is empty. A fresh cycle begins and so on. In this way, an appropriate number of successive passes from 2 towards 3 and from 3 towards 4 is obtained, with intermediate grinding at 1.
  • the valve 42 is opened and the valves 40 and 41 are closed. The treated material is then directed at 39 into the finishing tank 40, from which it is collected.
  • the opening of the valve 40 is initiated by a predetermining counter which counts the successive cycles.
  • the probes 47 and 48 of the tank 21 have the object of maintaining permanently a certain quantity of product in the said tank, in order to prevent the pump 25 from drawing air into the circuits.
  • the stopping of the pump 25 takes place if the level in 21 falls below the probe 47, in order to prevent the pump 25 from working when empty.
  • the probe 48 starts up the pump 25 again when the level in 21 rises to that of probe 48. The stopping is effected by the release of the electro-magnetic clutch 56 of the pump 25.
  • Safety devices are provided in addition, in order to stop the whole installation in the event of an untoward incident of any kind.
  • Example 1 20 kgs. dry weight of a pulp obtained from a filter press of a pigment resulting from the copulation of diazotized meta-nitro-para-toluidine, and copulated on acetyl-aceto-anilide, and complying with the following formula:
  • Example 2 NO OQHN are put in reaction in the apparatus with kgs. of 1.4 dioxane and a small proportion of hydrogenated colophony as the dispersing agent.
  • Example 3 50 kgs. of phthalo-cyanine blue of the alpha form, ob-
  • the dispersion is then subjected to the method of discontinuous cycling for 3 cycles, the covering power being verified according to the usual standards, in order to bring the blue to a uniform state of granulation permitting the best covering power to be obtained.
  • This dispersion is then added to an emulsion of vinyl acetate containing the chemical products necessary for the manufacture of a paint. There is thus obtained a paint of indoor or outdoor quality having a very strong resistance to light, a maximum covering power and an excellent colour efiiciency.
  • Example 4 There is put into the apparatus 30 kgs. of sulphur in dispersion in 150 litres of water and there are then carried out discontinuous cyclings following the process indicated above, with the desired dispersing agent.
  • the emulsion thus obtained is poured into a Werner- Pfeiderer apparatus under vacuum or alternatively the emulsion is atomized in an atomization chamber until a powder is obtained which, When diluted in water, can serve as a highly-active pepticide product.
  • Example 5 32 kgs. of acetyl salicylic acid are put into dispersion with 68 kgs. of water in the apparatus which has been described above. This dispersion is treated in the apparatus described until a molecular division of about 0.5 mg is obtained.
  • a method of grinding solid particles in a plurality of repeating cycles comprising placing the material to be ground in suspension in a liquid in a first receptacle, passing the material from the first receptacle into a grinder until the 'first receptacle is substantially empty, collecting the material from the grinder in a second receptacle, passing the material from the second receptacle back into the grinder until the second receptacle is substantially empty, and passing the material from the grinder back into the first receptacle.
  • Grinding apparatus comprising a grinder, two receptacles for receiving the material to be ground, conduit means connecting the grinder with each of the two receptacles, valve means for directing the material alternately through the conduit means from the first receptacle through the grinder to the second receptacle and from the second receptacle through the grinder to the first receptacle, and means responsive to the level of the material in the first and second receptacles to actuate the valve means alternately to fill and empty the first and second receptacles.
  • Apparatus as claimed in claim 2 comprising detector means in the first and second receptacles for detecting the level of material therein.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Crushing And Grinding (AREA)
US261649A 1962-03-05 1963-02-28 Method and apparatus for grinding solid particles Expired - Lifetime US3204880A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH269162A CH398270A (fr) 1962-03-05 1962-03-05 Procédé de broyage de particules solides

Publications (1)

Publication Number Publication Date
US3204880A true US3204880A (en) 1965-09-07

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Family Applications (1)

Application Number Title Priority Date Filing Date
US261649A Expired - Lifetime US3204880A (en) 1962-03-05 1963-02-28 Method and apparatus for grinding solid particles

Country Status (6)

Country Link
US (1) US3204880A (es)
BE (1) BE628726A (es)
CH (1) CH398270A (es)
ES (1) ES285694A1 (es)
GB (1) GB961519A (es)
NL (1) NL289716A (es)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5138773U (es) * 1974-09-17 1976-03-23
US3998938A (en) * 1971-07-27 1976-12-21 Union Process International, Inc. Method and apparatus for grinding particulate solids
US4224354A (en) * 1978-09-22 1980-09-23 Union Process International, Inc. Method for making chocolate and chocolate flavored materials
US20070025178A1 (en) * 2005-07-27 2007-02-01 Xerox Corporation Pigment dispersions and preparation method thereof
US10314321B2 (en) * 2014-01-15 2019-06-11 Coatech Beheer B.V. Method for operating a ball mill and a milling system

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1069986A (en) * 1963-08-22 1967-05-24 Us Stoneware Inc Method of comminution and apparatus therefor
FR2610540B1 (fr) * 1987-02-10 1990-08-10 Cle Procede de broyage de matieres minerales quelconques et installation pour la mise en oeuvre de ce procede
CN103846141A (zh) * 2013-05-29 2014-06-11 洛阳宇航重工机械有限公司 一种产大颗粒氧化铝结壳块粒度的粉磨装置及粉磨工艺

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1265809A (en) * 1917-09-14 1918-05-14 Bertrand Andre Navarre Apparatus for regenerating old paper.
US1291877A (en) * 1919-01-21 Papeb-stock-tbeating machine
US2148608A (en) * 1936-11-20 1939-02-28 Stubner Emile C De Dispersion apparatus
US2378432A (en) * 1942-05-28 1945-06-19 Reynolds Metals Co Pigment
US2982482A (en) * 1960-06-01 1961-05-02 Ed Jones Corp Double-disk refiner
US3118622A (en) * 1962-02-09 1964-01-21 Ed Jones Corp Recirculating disk refiner

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1291877A (en) * 1919-01-21 Papeb-stock-tbeating machine
US1265809A (en) * 1917-09-14 1918-05-14 Bertrand Andre Navarre Apparatus for regenerating old paper.
US2148608A (en) * 1936-11-20 1939-02-28 Stubner Emile C De Dispersion apparatus
US2378432A (en) * 1942-05-28 1945-06-19 Reynolds Metals Co Pigment
US2982482A (en) * 1960-06-01 1961-05-02 Ed Jones Corp Double-disk refiner
US3118622A (en) * 1962-02-09 1964-01-21 Ed Jones Corp Recirculating disk refiner

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3998938A (en) * 1971-07-27 1976-12-21 Union Process International, Inc. Method and apparatus for grinding particulate solids
JPS5138773U (es) * 1974-09-17 1976-03-23
JPS5520372Y2 (es) * 1974-09-17 1980-05-15
US4224354A (en) * 1978-09-22 1980-09-23 Union Process International, Inc. Method for making chocolate and chocolate flavored materials
US20070025178A1 (en) * 2005-07-27 2007-02-01 Xerox Corporation Pigment dispersions and preparation method thereof
US10314321B2 (en) * 2014-01-15 2019-06-11 Coatech Beheer B.V. Method for operating a ball mill and a milling system

Also Published As

Publication number Publication date
ES285694A1 (es) 1963-08-01
CH398270A (fr) 1965-08-31
NL289716A (es)
BE628726A (es)
GB961519A (en) 1964-06-24

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