US3482786A - Apparatus for comminuting materials - Google Patents

Apparatus for comminuting materials Download PDF

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Publication number
US3482786A
US3482786A US593353A US3482786DA US3482786A US 3482786 A US3482786 A US 3482786A US 593353 A US593353 A US 593353A US 3482786D A US3482786D A US 3482786DA US 3482786 A US3482786 A US 3482786A
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United States
Prior art keywords
particles
supply
blast
outlet
container
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Expired - Lifetime
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US593353A
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English (en)
Inventor
Gerald V Hogg
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GERALD V HOGG
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GERALD V HOGG
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    • 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
    • B02C19/06—Jet mills
    • B02C19/066—Jet mills of the jet-anvil type

Definitions

  • This invention relates to a method of, and apparatus for, comminuting materials, and more particularly for pulverising particles of metal or other material to produce powder of a grain size suitable for use in powder metallurgy processes.
  • the invention is more particularly concerned with pulverising scrap iron, mild steel or low alloy steels.
  • a method of pulverising metal particles which comprises the steps of entraining particles of metal or other material in a stream of compressed air or other gas, accelerating the particles to high speed and directing them against a target whereby a proportion thereof is caused to shatter into powder, separting the oversize particles from the powder, charging the oversize particles alternately into one or other of two supply containers, and discharging oversize particles from one of the supply containers into said compressed gas stream, whilst the other supply container is receiving a charge of said oversize particles.
  • the present invention also provides apparatus for pulverising particles of metal or other material which comprises a blast pipe connected to receive particles from a supply and to direct the particles in a high speed gas stream into a blast chamber in which they are shattered to form powder, a separator connected to receive a mixture of powder and oversize particles from the blast chamher and operable to separate out the oversize particles and return them to the supply, and wherein said supply comprises first and second supply containers operable alternatively to receive and store oversize particles from the separator, and to discharge the stored particles into the blast pipe, each supply container being operable in the one .sense whilst the other supply container is operating in the other sense.
  • the present invention further provides apparatus for pulverising particles of metal or other material which comprises a blast pipe for connection to a source of compressed gas and having an inlet for metal particles to be entrained in a stream of gas flowing through the blast pipe, a blast chamber into which the blast pipe is arranged to discharge, a target disposed within the blast chamber opposite the outlet of the blast pipe, a recycling conduit extending from the blast chamber, a separator connected to said recycling conduit to receive material carried from the blast chamber in the gas stream, to separate powder from oversize particles and direct the latter to an outlet, first and second supply containers connected to said outlet of the separator through first and second Patented Dec.
  • first and second supply containers being connected to said inlet of the blast pipe via third and fourth valves respectively, whereby the supply containers can be opened alternately to the blast pipe and to the separator so that whilst one container is discharging particles into the blast pipe, the other supply container is receiving particles from the separator.
  • the apparatus comprises a blast chamber 10' containing a blast shield or target 11, and a blast pipe 12 for discharging the material to be pulverised at high velocity into the blast chamber so that it will impinge against the blast target and be shattered into smaller particles.
  • the target 11 and preferably also the internal walls of the blast chamber, should be made of a material which is highly resistant to wear, and will depend on the material being pulverised.
  • the blast pipe is connected to a source of high pressure air, or other gas, and the particles of material are introduced from a supply into the blast pipe through an inlet 13 in the wall of the ppie, and are carried along the pipe in the air stream.
  • the inlet 13 is in the form of a stub pipe or Pitot tube having a downstream-facing outlet opening such that particles are sucked into the gas stream by the low pressure created on the downstream side of the outlet opening.
  • the outlet end of the blast pipe is provided with a supersonic venturi nozzle 14 to increase the velocity of the air and material flow and thereby accelerate the particles to supersonic speed.
  • This venturi will also be made of a highly wear-resistant material.
  • the base of the blast chamber is connected through a T junction 15 to a recycling conduit 16 having a second inlet closed by a flap valve 17 to enable air to enter the conduit 16, after the compressed gas supply has been shut off, to clear material from the conduit.
  • the conduit 16 leads to a first cyclone separator 18 which serves to separate out powder, and pass oversize particles into a recycling outlet 20 connected to the supply system.
  • a second cyclone separator 21 connected from the first separator 18 via a pipe 19 is provided to separate dust from the particles of required size.
  • the supply system comprises downwardly-extending branched ducts 22, 23 connected from the recycling outlet of the first cyclone separtaor to the top of two supply containers 24, 25, each branch of the duct having a valve (V V respectively) for controlling the supply of recycled material to the supply containers.
  • V V valve
  • These containers must be sufiiciently strong to withstand the maximum blast pressure.
  • the outlets of the two supply containers at the bottom of the containers are connected through downwardly-extending ducts 26, 27 to the common supply inlet 13 in the wall of the blast pipe. These two ducts are controlled by valves V V, respectively.
  • control means 30 are provided for controlling the opening and closing of the various control valves, and also sensing means 31, 32 are provided in the containers for sensing the level of material in the containers and thereby operate the control means 30, Additional or alternative sensing means can be provided to sense the flow of material at various points in the system.
  • a filling hopper 35 is provided which is connected to the top of one of the supply containers, for example contatiner 25, through a duct 36 controlled by a valve V
  • a filling hopper may be provided to feed into the first cyclone separator.
  • each container is connected through a three way valve V with a separate source of compressed gas.
  • valve V has been opened, to introduce an initial charge of material into container 25, and thereafter closed, the valves V and V are closed and valves V and V; are open.
  • the pressure in container 25 will quickly build up, (or can be increased by connection to the separate compressed gas source via valve V and permit material to flow through outlet valve V into the blast tube 12 where it will be entrained in the air flow and, after passing through the venturi nozzle, will shatter against the blast shield.
  • the cominuted material will fall to the bottom of the blast chamber and will again be entrained in the air flow and carried through the blast chamber outlet and recycling conduit 16 into the first cyclone separator 18.
  • the oversize particles from the first cyclone separator will flow into the branched ducts 22, 23 and although some will build up against the closed inlet valve V the major part will flow through the open inlet valve V into container 24.
  • outlet valve V When the initial charge in container has passed into the blast pipe, the outlet valve V is closed, and thereafter invet valve V is opened to allow recycled material to flow into container 25. At the same time, inlet valve V of container 24 is closed and thereafter outlet valve V is opened and the recycled material in container 24 is fed to the blast pipe.
  • valves controlling the material flow into and out of the containers 24, 25 can be operated in a simple sequence to permit the containers to fill-up and discharge alternately.
  • the control means can be arranged to operatet he valves automatically in a timed sequence or in dependence upon sensing means such as 31, 32 which are disposed within the bottom or outlet duct of each container to sense the termination of material flow from the container. In this way the system can be rendered fully automatic as well as continuous.
  • Apparatus for pulverising particles of metal and other material comprising in combination,
  • a blast pipe having a first inlet for compressed gas, a
  • a high pressure gas source connected to said first inlet of the blast pipe to discharge a gas stream at high velocity therethrough
  • a blast chamber connected to said outlet of the blast a target, disposed within the blast chamber opposite said 4 blast pipe outlet, against which the material particles can impinge and shatter into powder
  • a recycling conduit having an inlet connected to said blast chamber, and an outlet
  • a vacuum generating particle separator located above the blast chamber connected to the recycling conduit outlet to receive powder and oversize particles 'fiowing in the gas stream from said blast chamber, and to separate the powder from the oversize particles the separator having a first outlet for oversize particles and a second outlet for powder,
  • first and second supply containers forming said material particles supply located beneath the particle separator, and each having a particle inlet in its top and a particle outlet in its bottom,
  • first and second supply ducts extending from said first outlet of the separator to the respective inlets of the first and second supply containers
  • first and second inlet control valves disposed in said first and second ducts respectively to control the flow of particles from the separator to said containers
  • third and fourth supply ducts extending from the first and second container outlets respectively to said second inlet of the blast pipe
  • third and fourth outlet control valves disposed in said third and fourth ducts respectively to control the flow of particles from the containers to said blast P p valve control means operable to alternately open the inlet control valve and close the outlet control valve of one supply container while closing the inlet control valve and opening the outlet control valve of the other supply container,
  • the container with the outlet control valve opened being under positive pressure and the container having the outlet valve closed being under vacuum generated by the separator.
  • valve control means operates said vavles in a timed sequence.
  • Apparatus according to claim 1 having means for sensing the content of material of each supply container and for controlling the valve operating means in dependence upon the sensed content.
  • each said supply container has an inlet for compressed gas whereby the pressure within the container can be raised at least as high as that in the blast pipe.
  • Apparatus according to claim 1 having a supersonic nozzle in said blast pipe for accelerating said particles to supersonic speed.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Air Transport Of Granular Materials (AREA)
  • Cyclones (AREA)
US593353A 1965-11-12 1966-11-10 Apparatus for comminuting materials Expired - Lifetime US3482786A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB48015/65A GB1119124A (en) 1965-11-12 1965-11-12 A method of and apparatus for comminuting materials

Publications (1)

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US3482786A true US3482786A (en) 1969-12-09

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US593353A Expired - Lifetime US3482786A (en) 1965-11-12 1966-11-10 Apparatus for comminuting materials

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US (1) US3482786A (de)
DE (1) DE1507526A1 (de)
GB (1) GB1119124A (de)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3876156A (en) * 1971-12-29 1975-04-08 Bayer Ag Method of and apparatus for the jet-pulverisation of fine grained and powdered solids
US3895760A (en) * 1973-05-18 1975-07-22 Lone Star Ind Inc Method and apparatus for shattering shock-severable solid substances
US4930707A (en) * 1987-11-18 1990-06-05 Canon Kabushiki Kaisha Pneumatic pulverizer and pulverizing method
US5133504A (en) * 1990-11-27 1992-07-28 Xerox Corporation Throughput efficiency enhancement of fluidized bed jet mill
US5277369A (en) * 1990-10-02 1994-01-11 Fuji Xerox Co., Ltd. Micromilling device
US5316222A (en) * 1989-08-30 1994-05-31 Canon Kabushiki Kaisha Collision type gas current pulverizer and method for pulverizing powders
US5547135A (en) * 1990-10-02 1996-08-20 Fuji Xerox Co., Ltd. Micromilling apparatus
US20060208113A1 (en) * 2003-04-21 2006-09-21 Kwang-Jae Lee Muller
US20070075167A1 (en) * 2003-10-10 2007-04-05 Jouko Niemi Method for industrial producing of highly dispersed powders
CN112138826A (zh) * 2019-06-26 2020-12-29 西南科技大学 一种制备高长径比纤维状超细粉体的方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2617067C3 (de) * 1976-04-17 1978-12-21 Kernforschungsanlage Juelich Gmbh, 5170 Juelich Vorrichtung zum Aufbrechen der Hüllschichten von beschichteten Brenn- und/ oder Brutstoffpartikeln für Kernreaktoren

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2103453A (en) * 1933-06-28 1937-12-28 Hephaest A G Fur Motorische Kr Method of burning pulverized fuel
US2560807A (en) * 1951-07-17 Method of explosive pulverization
US2662007A (en) * 1947-06-02 1953-12-08 Kellogg M W Co Gasification of powdered caking type coal
US2668669A (en) * 1947-09-18 1954-02-09 Kellogg M W Co Apparatus for the explosive pulverization of coal
US2891734A (en) * 1955-09-06 1959-06-23 Hazemag Hartzerkleinerung Disintegrating asbestos ores

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2560807A (en) * 1951-07-17 Method of explosive pulverization
US2103453A (en) * 1933-06-28 1937-12-28 Hephaest A G Fur Motorische Kr Method of burning pulverized fuel
US2662007A (en) * 1947-06-02 1953-12-08 Kellogg M W Co Gasification of powdered caking type coal
US2668669A (en) * 1947-09-18 1954-02-09 Kellogg M W Co Apparatus for the explosive pulverization of coal
US2891734A (en) * 1955-09-06 1959-06-23 Hazemag Hartzerkleinerung Disintegrating asbestos ores

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3876156A (en) * 1971-12-29 1975-04-08 Bayer Ag Method of and apparatus for the jet-pulverisation of fine grained and powdered solids
US3895760A (en) * 1973-05-18 1975-07-22 Lone Star Ind Inc Method and apparatus for shattering shock-severable solid substances
US4930707A (en) * 1987-11-18 1990-06-05 Canon Kabushiki Kaisha Pneumatic pulverizer and pulverizing method
US5316222A (en) * 1989-08-30 1994-05-31 Canon Kabushiki Kaisha Collision type gas current pulverizer and method for pulverizing powders
US5435496A (en) * 1989-08-30 1995-07-25 Canon Kabushiki Kaisha Collision-type gas current pulverizer and method for pulverizing powders
US5547135A (en) * 1990-10-02 1996-08-20 Fuji Xerox Co., Ltd. Micromilling apparatus
US5277369A (en) * 1990-10-02 1994-01-11 Fuji Xerox Co., Ltd. Micromilling device
US5133504A (en) * 1990-11-27 1992-07-28 Xerox Corporation Throughput efficiency enhancement of fluidized bed jet mill
US20060208113A1 (en) * 2003-04-21 2006-09-21 Kwang-Jae Lee Muller
US7513447B2 (en) * 2003-04-21 2009-04-07 Nano Korea Company, Ltd. Muller
US20070075167A1 (en) * 2003-10-10 2007-04-05 Jouko Niemi Method for industrial producing of highly dispersed powders
US7461799B2 (en) * 2003-10-10 2008-12-09 Micropulva Ltd Oy Method for industrial producing of highly dispersed powders
CN112138826A (zh) * 2019-06-26 2020-12-29 西南科技大学 一种制备高长径比纤维状超细粉体的方法

Also Published As

Publication number Publication date
GB1119124A (en) 1968-07-10
DE1507526A1 (de) 1969-04-10

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