EP0082816B1 - Verfahren und Vorrichtung zum Abrunden körniger Feststoffpartikel - Google Patents

Verfahren und Vorrichtung zum Abrunden körniger Feststoffpartikel Download PDF

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Publication number
EP0082816B1
EP0082816B1 EP82810535A EP82810535A EP0082816B1 EP 0082816 B1 EP0082816 B1 EP 0082816B1 EP 82810535 A EP82810535 A EP 82810535A EP 82810535 A EP82810535 A EP 82810535A EP 0082816 B1 EP0082816 B1 EP 0082816B1
Authority
EP
European Patent Office
Prior art keywords
nozzle
liquid
container
particles
funnel
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
Application number
EP82810535A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0082816A2 (de
EP0082816A3 (en
Inventor
Werner J. Borer
Janos Lukacs
Hugo Spalinger
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.)
Alcan Holdings Switzerland AG
Original Assignee
Schweizerische Aluminium AG
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 Schweizerische Aluminium AG filed Critical Schweizerische Aluminium AG
Publication of EP0082816A2 publication Critical patent/EP0082816A2/de
Publication of EP0082816A3 publication Critical patent/EP0082816A3/de
Application granted granted Critical
Publication of EP0082816B1 publication Critical patent/EP0082816B1/de
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B11/00—Machines or devices designed for grinding spherical surfaces or parts of spherical surfaces on work; Accessories therefor
    • B24B11/02—Machines or devices designed for grinding spherical surfaces or parts of spherical surfaces on work; Accessories therefor for grinding balls
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B31/00—Machines or devices designed for polishing or abrading surfaces on work by means of tumbling apparatus or other apparatus in which the work and/or the abrasive material is loose; Accessories therefor
    • B24B31/10—Machines or devices designed for polishing or abrading surfaces on work by means of tumbling apparatus or other apparatus in which the work and/or the abrasive material is loose; Accessories therefor involving other means for tumbling of work

Definitions

  • the present invention relates to a method and a device for rounding off granular solid particles of any grain shape, in particular hard-break granules.
  • Rounded particles are already manufactured using various processes.
  • a very common method is to spray molten material using a gas jet.
  • This process is mainly used for the production of spherical metal powders, but also for the production of powders from refractory materials.
  • the disadvantage of the process is that it cannot be used generally for hard materials, including oxides, carbides, borides and nitrides or refractory metals with a Mohs hardness of> 7, since these materials sometimes have very high melting points and not all remain chemically stable in the molten state.
  • the formation of hollow spherical particles during spraying cannot always be prevented.
  • Another known method for producing rounded particles is the surface melting and thus rounding of solids in a high-energy beam, e.g. B. a plasma jet. Again, this process can only be used for materials with a stable liquid phase and, depending on the material, is limited to particle sizes of approx. 10-200 11m.
  • rounded moldings can be produced by agglomeration or build-up granulation of correspondingly fine starting powders and subsequent sintering in accordance with DE-OS 29 48 584.
  • Such a method is also disadvantageous because the material be previously milled to about 1 / 100th bis 1/1000 of the final desired particle size, in order for even a sinterable powder is obtained, and that the diameter range of the end product to about 0.4 to 5 mm is limited.
  • sol-gel process can only be used for certain materials. It is mainly used for the production of oxide spheres in the range of ⁇ 500 1 1m.
  • the spraying process delivers products of insufficient quality. Usually only particles with low density can be produced due to the loose structure.
  • US Pat. No. 3,436,868 describes a container with at least one nozzle and an outlet for rounding off diamonds or other stones, in that they are held in a constant relative movement in a liquid with the aid of a liquid jet emerging from a nozzle and thereby abut against one another. Larger quantities of solid particles cannot then be rounded off economically.
  • the inventors have therefore set themselves the task of specifying a method and a device for rounding off granular solid particles of any grain shape, in particular hard granulate, which do not have the disadvantages mentioned above.
  • the proposed inventive method is characterized by the wording of claim 1, the inventive device by the wording of claim 4.
  • the particle size of the starting material is advantageously in the range of 100 (up to 5 mm.
  • a liquid of course, one is chosen that cannot dissolve or dissolve the starting grain.
  • water is preferably used.
  • the liquid jet must be so intense be that a mutual abrasion is caused by the collision of the individual particles.
  • a conical funnel 1 with a tubular side outlet 11 there is a nozzle 2 at the lower end for feeding the liquid and an overflow 3 at the upper end.
  • the nozzle 2 in its simplest embodiment is a cylindrical tube. This advantageously projects into the interior of the funnel 1. An increase in the rounding-off performance can thereby be achieved.
  • the cone-shaped part of the funnel 1 is divided in this arrangement in its height H into a lower zone A and an upper zone B.
  • the lower zone A is limited by the height h, which corresponds to the length of the part 22 of the nozzle 2 protruding into the conical part of the funnel 1.
  • the height h is about 1 / 10th of the height H.
  • those particles which are located in the lower zone A, are also involved in the rounding process is fed in by means of a tubular auxiliary nozzle 4 at intervals of time in addition liquid, whereby the in the lower zone A material at rest in the upper zone B of the hopper 1, that is, is conveyed to the active zone.
  • the easiest way to switch the auxiliary nozzle 4 on and off is with a solenoid valve 5.
  • the overflow 3 is channel-shaped and has an outlet 6 at one point, where the liquid is removed together with the fine abrasion caused by the rounding. After the abrasion has been separated from the liquid in a manner known per se, the liquid can be fed back to the nozzle 2. (Separating device and circulation of the liquid are not shown in the drawing.) If the starting material is sufficiently rounded, the liquid supply is interrupted for a short time and valve 7, advantageously a compressed air membrane valve, is opened so that the rounded material can flow out and (not shown ) the liquid, which is pumped back into the funnel, is freed via a separating device.
  • the average sinking speed of the particles to be rounded off in the liquid used should be at least 10 times the speed of the liquid in the upper region b of the upper zone B of the funnel 1, that is to say in the vicinity of the overflow 3 Prevent discharge of the rounded particles from the funnel 1.
  • the speed of the liquid in the upper zone B is advantageously set in the region b with the aid of the nozzle 2 such that it is not more than 1/2 the average sinking speed of the particles to be treated in the liquid used.
  • the throughput of the amount of liquid through the auxiliary nozzle 4 should advantageously be at least twice as large as the throughput through the nozzle 2.
  • Example 2 Using the same device and under the same conditions as in Example 1, 50 kg of corundum, SN 24 grain (according to FEPA), corresponding to a grain size range of 0.6-0.84 mm, were treated. After 138 hours a material could be removed which had a roundness of 0.6 and a surface smoothness (roundness) of 0.9. The yield of rounded grain was 68%.
  • the abrasion from the overflow 3 was collected in a sales basin and used for the production of micrograins.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Devices And Processes Conducted In The Presence Of Fluids And Solid Particles (AREA)
  • Glanulating (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Cereal-Derived Products (AREA)
  • Confectionery (AREA)
  • Seeds, Soups, And Other Foods (AREA)
  • Carbon And Carbon Compounds (AREA)
EP82810535A 1981-12-23 1982-12-09 Verfahren und Vorrichtung zum Abrunden körniger Feststoffpartikel Expired EP0082816B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH8244/81 1981-12-23
CH8244/81A CH667223A5 (de) 1981-12-23 1981-12-23 Verfahren und vorrichtung zum abrunden koerniger feststoffpartikel.

Publications (3)

Publication Number Publication Date
EP0082816A2 EP0082816A2 (de) 1983-06-29
EP0082816A3 EP0082816A3 (en) 1985-05-22
EP0082816B1 true EP0082816B1 (de) 1988-05-11

Family

ID=4337364

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82810535A Expired EP0082816B1 (de) 1981-12-23 1982-12-09 Verfahren und Vorrichtung zum Abrunden körniger Feststoffpartikel

Country Status (8)

Country Link
US (2) US4476071A (no)
EP (1) EP0082816B1 (no)
JP (1) JPS58122032A (no)
CA (1) CA1231928A (no)
CH (1) CH667223A5 (no)
DE (2) DE3241459C1 (no)
ES (1) ES518042A0 (no)
NO (1) NO156114C (no)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3345983C2 (de) * 1983-12-20 1986-09-04 Wolfgang 4600 Dortmund Seidler Verfahren und Vorrichtung zur Herstellung von kugelförmigen metallischen Partikeln
JPH0657310B2 (ja) * 1987-03-24 1994-08-03 ホソカワミクロン株式会社 無機質結晶体粒子の整粒方法
IE911504A1 (en) * 1990-05-31 1991-12-04 Lonza Ag A composite material comprising mechanically resistant¹particles
FR2732674B1 (fr) * 1995-04-10 1997-05-09 Alcatel Fibres Optiques Procede et dispositif de spheroidisation de granules de silice
FR2902767B1 (fr) * 2006-06-22 2008-09-19 J P B Creations Sa Dispositif de conditionnement d'un produit a base de colle
CN103302563B (zh) * 2012-03-14 2015-11-25 富泰华工业（深圳）有限公司 打磨装置及使用该打磨装置的机械手
DE102019112791B3 (de) * 2019-05-15 2020-06-18 Netzsch Trockenmahltechnik Gmbh Schleifvorrichtung zum verrunden von partikeln

Family Cites Families (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE459595C (de) * 1924-12-23 1928-05-08 Hartstoff Metall A G Hametag Abrunden von Metallpulverteilchen
US1601898A (en) * 1925-07-09 1926-10-05 Roy E Wiley Granular product and method of producing same
US2186659A (en) * 1936-07-17 1940-01-09 Micro Products Corp Magnetic powder for iron dust cores
US2304221A (en) * 1940-03-27 1942-12-08 Celanese Corp Drying apparatus
US2460918A (en) * 1942-12-12 1949-02-08 Jr Albert G Bodine Method-of and apparatus for cutting and the like
US2874950A (en) * 1954-03-16 1959-02-24 Pyzel Fitzpatrick Inc Hydraulic cement process
DE1202171B (de) * 1959-07-03 1965-09-30 Dr Guenter Friese Verfahren zur Oberflaechenbearbeitung von Werkstuecken
DE1427553A1 (de) * 1960-02-19 1969-08-28 Ajem Lab Inc Verfahren und Apparatur zur Oberflaechenumwandlung mittels Kornsuspension
US3207818A (en) * 1963-12-27 1965-09-21 Western Electric Co Methods of forming spherical particles of crystallizable thermoplastic polymers
US3436868A (en) * 1965-03-19 1969-04-08 Christensen Diamond Prod Co Rounding and polishing apparatus for crystalline carbon bodies
BE790404A (fr) * 1971-10-21 1973-02-15 Metallgesellschaft Ag Procede et dispositif de traitement superficiel de
AU464396B2 (en) * 1972-05-25 1975-08-28 Alcronite New Zealand Improvements in and relating to protective surfaces
DD102108A1 (no) * 1972-07-20 1973-12-12
JPS518876B2 (no) * 1972-10-03 1976-03-22
JPS5535062Y2 (no) * 1976-01-09 1980-08-19
US4165473A (en) * 1976-06-21 1979-08-21 Varian Associates, Inc. Electron tube with dispenser cathode
JPS5542734A (en) * 1978-09-19 1980-03-26 Inoue Japax Res Inc Barrel grinding method
CA1117987A (en) * 1978-12-13 1982-02-09 Robert J. Seider Sintered high density spherical ceramic pellets for gas and oil well proppants and their process of manufacture
US4246208A (en) * 1979-03-22 1981-01-20 Xerox Corporation Dust-free plasma spheroidization
JPS5626975A (en) * 1979-08-14 1981-03-16 Asahi Glass Co Ltd Display element

Also Published As

Publication number Publication date
NO824296L (no) 1983-06-24
DE3241459C1 (de) 1983-07-21
US4476071A (en) 1984-10-09
NO156114B (no) 1987-04-21
ES8503526A1 (es) 1985-03-16
EP0082816A2 (de) 1983-06-29
JPS6359735B2 (no) 1988-11-21
NO156114C (no) 1987-08-05
DE3278460D1 (en) 1988-06-16
CA1231928A (en) 1988-01-26
ES518042A0 (es) 1985-03-16
JPS58122032A (ja) 1983-07-20
CH667223A5 (de) 1988-09-30
EP0082816A3 (en) 1985-05-22
US4592707A (en) 1986-06-03

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