EP0082816A2 - Procédé et dispositif pour arrondir des particules solides granulaires - Google Patents

Procédé et dispositif pour arrondir des particules solides granulaires Download PDF

Info

Publication number
EP0082816A2
EP0082816A2 EP82810535A EP82810535A EP0082816A2 EP 0082816 A2 EP0082816 A2 EP 0082816A2 EP 82810535 A EP82810535 A EP 82810535A EP 82810535 A EP82810535 A EP 82810535A EP 0082816 A2 EP0082816 A2 EP 0082816A2
Authority
EP
European Patent Office
Prior art keywords
funnel
liquid
particles
rounded
nozzle
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.)
Granted
Application number
EP82810535A
Other languages
German (de)
English (en)
Other versions
EP0082816B1 (fr
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
Alusuisse Holdings AG
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 Alusuisse Holdings AG, Schweizerische Aluminium AG filed Critical Alusuisse Holdings AG
Publication of EP0082816A2 publication Critical patent/EP0082816A2/fr
Publication of EP0082816A3 publication Critical patent/EP0082816A3/de
Application granted granted Critical
Publication of EP0082816B1 publication Critical patent/EP0082816B1/fr
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 for rounding off granular solid particles, in particular hard granulate.
  • 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 process has the disadvantage 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 the production of rounded particles is the surface melting and thus rounding of solids in a high energy beam, e.g. a plasma jet. Again, this method can only be used for materials with a stable liquid phase and, depending on the material, is also limited to particle sizes of approx. 10 - 200 p.
  • 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 p.
  • the spraying process delivers products of insufficient quality. Usually only particles with low density can be produced due to the loose structure.
  • the inventors have therefore set themselves the task of specifying a method for rounding off granular solid particles of any grain shape, in particular hard material breakage granules, which does not have the disadvantages of the above-mentioned methods.
  • the proposed inventive method is characterized by the wording of claim 1.
  • the particle size of the starting material is advantageously in the range from 100 p to 5 mm.
  • the liquid chosen is one that is unable to dissolve or dissolve the starting grain.
  • water is preferred used.
  • the liquid jet must be so intense that the individual particles collide with one another, causing mutual abrasion.
  • a conical funnel 1 with a tubular lateral 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 is conveyed into the upper zone B of the hopper 1, ie into 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.
  • 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.
  • valve 7 advantageously a compressed air membrane valve
  • 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 amount per unit time rounded particles is as large as possible and on the other hand, all particles in mö g- lichst same extent, ie homogeneous rounded, it has proved to be advantageous, the half aperture angle ⁇ of the funnel 1 14-22 to put °, If the opening angle is too large, some of the rounded material remains on the funnel wall and is not moved. On the other hand, if the opening angle is too small, the Throughput smaller. A funnel angle of 18 - 19 ° is optimal. So that the particles to be rounded cannot leave the funnel 1 via the overflow 3, it is also advantageous to select the height H of the funnel 1 so that it is at least 2.5 times the grain size of the starting material in the idle state before the rounding process begins.
  • the velocity of the liquid in the upper zone B b is in the range with the aid of the nozzle 2 advantageously determined so that it does not than 1 / 20th of the average rate of descent of the particles to be treated is more 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.
  • the bulk density of granular materials can be increased significantly with short treatment times of less than 1 hour.
  • the bulk density of silicon carbide, grain size SN 8 (according to FEPA), corresponding to a grain size range of 2.0 - 2.8 mm, was 15% after 1 hour of treatment, and even 27% after 3 hours of treatment compared to the bulk weight of the untreated material.
  • Materials treated in this way are advantageously used in the refractory sector because they have an increased resistance to oxidation compared to untreated ones.
  • the toughness of the rounded grains is significantly higher than that of the non-rounded grains.
  • the rounded material could be used as proppants for gap filling in the petroleum industry.
  • the rounded hard materials produced by the process according to the invention can also be used to produce wear-resistant shaped bodies or layers, e.g. Linings of mills, classifiers, cyclones or conveyor lines can be used if they are used as filling material in plastic resin masses or adhesives.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Glanulating (AREA)
  • Devices And Processes Conducted In The Presence Of Fluids And Solid Particles (AREA)
  • Carbon And Carbon Compounds (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Cereal-Derived Products (AREA)
  • Confectionery (AREA)
  • Seeds, Soups, And Other Foods (AREA)
EP82810535A 1981-12-23 1982-12-09 Procédé et dispositif pour arrondir des particules solides granulaires Expired EP0082816B1 (fr)

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 true EP0082816A2 (fr) 1983-06-29
EP0082816A3 EP0082816A3 (en) 1985-05-22
EP0082816B1 EP0082816B1 (fr) 1988-05-11

Family

ID=4337364

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82810535A Expired EP0082816B1 (fr) 1981-12-23 1982-12-09 Procédé et dispositif pour arrondir des particules solides granulaires

Country Status (8)

Country Link
US (2) US4476071A (fr)
EP (1) EP0082816B1 (fr)
JP (1) JPS58122032A (fr)
CA (1) CA1231928A (fr)
CH (1) CH667223A5 (fr)
DE (2) DE3241459C1 (fr)
ES (1) ES8503526A1 (fr)
NO (1) NO156114C (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0461469A2 (fr) * 1990-05-31 1991-12-18 H.C. Starck GmbH & Co. KG Composite comprenant des articles durs
EP3738673A1 (fr) * 2019-05-15 2020-11-18 NETZSCH Trockenmahltechnik GmbH Dispositif de rectification destiné à l'arrondissement des particules

Families Citing this family (5)

* 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
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

Citations (8)

* 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
US2460918A (en) * 1942-12-12 1949-02-08 Jr Albert G Bodine Method-of and apparatus for cutting and the like
DE1202171B (de) * 1959-07-03 1965-09-30 Dr Guenter Friese Verfahren zur Oberflaechenbearbeitung von Werkstuecken
US3436868A (en) * 1965-03-19 1969-04-08 Christensen Diamond Prod Co Rounding and polishing apparatus for crystalline carbon bodies
DE1427553A1 (de) * 1960-02-19 1969-08-28 Ajem Lab Inc Verfahren und Apparatur zur Oberflaechenumwandlung mittels Kornsuspension
FR2157555A5 (fr) * 1971-10-21 1973-06-01 Roto Finish Sarl
DE2329335A1 (de) * 1972-07-20 1974-01-31 Barkas Werke Veb Verfahren zur herstellung von plastgleitlager
GB1389380A (en) * 1972-05-25 1975-04-03 Aakronite Decoratives Ltd Protective surfaces

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
US2874950A (en) * 1954-03-16 1959-02-24 Pyzel Fitzpatrick Inc Hydraulic cement process
US3207818A (en) * 1963-12-27 1965-09-21 Western Electric Co Methods of forming spherical particles of crystallizable thermoplastic polymers
JPS518876B2 (fr) * 1972-10-03 1976-03-22
JPS5535062Y2 (fr) * 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 (fr) * 1978-12-13 1982-02-09 Robert J. Seider Grenaille spherique en ceramique dense frittee destinee a l'etaiement des puits de petrole et de gaz et procede de fabrication
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

Patent Citations (8)

* 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
US2460918A (en) * 1942-12-12 1949-02-08 Jr Albert G Bodine Method-of and apparatus for cutting and the like
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
US3436868A (en) * 1965-03-19 1969-04-08 Christensen Diamond Prod Co Rounding and polishing apparatus for crystalline carbon bodies
FR2157555A5 (fr) * 1971-10-21 1973-06-01 Roto Finish Sarl
GB1389380A (en) * 1972-05-25 1975-04-03 Aakronite Decoratives Ltd Protective surfaces
DE2329335A1 (de) * 1972-07-20 1974-01-31 Barkas Werke Veb Verfahren zur herstellung von plastgleitlager

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0461469A2 (fr) * 1990-05-31 1991-12-18 H.C. Starck GmbH & Co. KG Composite comprenant des articles durs
EP0461469A3 (en) * 1990-05-31 1992-05-06 Lonza Ag Composite containing hard particles
EP3738673A1 (fr) * 2019-05-15 2020-11-18 NETZSCH Trockenmahltechnik GmbH Dispositif de rectification destiné à l'arrondissement des particules

Also Published As

Publication number Publication date
DE3241459C1 (de) 1983-07-21
ES518042A0 (es) 1985-03-16
JPS6359735B2 (fr) 1988-11-21
JPS58122032A (ja) 1983-07-20
NO156114B (no) 1987-04-21
NO156114C (no) 1987-08-05
EP0082816B1 (fr) 1988-05-11
US4592707A (en) 1986-06-03
DE3278460D1 (en) 1988-06-16
EP0082816A3 (en) 1985-05-22
US4476071A (en) 1984-10-09
NO824296L (no) 1983-06-24
ES8503526A1 (es) 1985-03-16
CA1231928A (fr) 1988-01-26
CH667223A5 (de) 1988-09-30

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