EP1419823B1 - Spiralstrahlmühle - Google Patents

Spiralstrahlmühle Download PDF

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Publication number
EP1419823B1
EP1419823B1 EP03025553A EP03025553A EP1419823B1 EP 1419823 B1 EP1419823 B1 EP 1419823B1 EP 03025553 A EP03025553 A EP 03025553A EP 03025553 A EP03025553 A EP 03025553A EP 1419823 B1 EP1419823 B1 EP 1419823B1
Authority
EP
European Patent Office
Prior art keywords
jet mill
spiral jet
pulverising
grinding
housing
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.)
Revoked
Application number
EP03025553A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1419823A2 (de
EP1419823A3 (de
Inventor
Siegfried Dr. Blümel
Volker Jürgens
Siegfried Wensing
Hans-Ulrich Schwanitz
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.)
Kronos International Inc
Original Assignee
Kronos International Inc
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
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=32115451&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP1419823(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Kronos International Inc filed Critical Kronos International Inc
Publication of EP1419823A2 publication Critical patent/EP1419823A2/de
Publication of EP1419823A3 publication Critical patent/EP1419823A3/de
Application granted granted Critical
Publication of EP1419823B1 publication Critical patent/EP1419823B1/de
Anticipated expiration legal-status Critical
Revoked 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
    • B02C19/06—Jet mills
    • B02C19/061—Jet mills of the cylindrical type

Definitions

  • the invention relates to a modular spiral jet mill with improved wear protection.
  • Spiral jet mills are known per se and are used for fine grinding or deagglomeration of solid particles.
  • a number of previous designs are detailed in the US-A-2 032 827 described. They usually consist of a flat-cylindrical grinding chamber in which an inwardly directed circular or spiral flow of a gas or gaseous fluid transports the Mahlgutpelle. Particulation takes place essentially by collision of the particles with one another.
  • the energy required for comminution is supplied via the gaseous medium, which in many conventional designs is blown tangentially into the grinding chamber with jet nozzles which are distributed over the circumference and thus generates and maintains a vortex.
  • the millbase is fed via a separate feed into the grinding chamber.
  • the mills can be placed both horizontally and vertically.
  • propellant gas usually compressed air or steam is used.
  • the known jet mills for example after DE-U-76 17 063 , are in principle constructed so that in a closed steel housing consisting of bottom, outer wall and lid only an inner steel ring is located.
  • the actual grinding chamber is located inside the steel ring and is limited by steel ring and the corresponding surfaces of the bottom and lid.
  • the propellant gas is introduced and passed through several nozzles through the inner steel ring in the grinding chamber.
  • abrasion occurs inside the mill due to abrasion and therefore requires increased Maintenance.
  • the quality of grinding produced can change and the product becomes contaminated by abrasion.
  • the surface of the grinding chamber is protected inside with a hard, wear-resistant lining against abrasion.
  • a suitable wear-resistant material such as carbide, aluminum oxide, silicon carbide or boron carbide or as in the GB-A-1 222 257 - Polytetrafluoroethylene (PTFE), PA66 (nylon) or polyurethane.
  • the connection of lining and mill housing is usually carried out by build-up welding of example carbide or by another type of non-positive connection such as screwing, gluing or spot welding.
  • Jet mills with renewable or replaceable linings are known from the literature, for example from the US-A-2 032827 .
  • GB-A-636,503 and GB-A-1 222 257 The wear-resistant lining in the form of plates, for example, in the US-A-2 690 880 described.
  • the annular Mahlraumwandung this spiral jet mill is lined with individual plates, which may consist of a wear-resistant alloy and are bolted to the housing wall.
  • the DE-U-7300113 is presented a vertical jet mill, the inside completely with a variety of flat plates made of wear-resistant material is lined.
  • the plates are preferably made of boron carbide (BC) or silicon carbide (SiC) and glued flat or welded to the mill housing.
  • BC boron carbide
  • SiC silicon carbide
  • the DE-U-299 09 743 describes a horizontally mounted spiral jet mill in modular design, which is only selectively lined with wear protection and in which the propellant is partially introduced via a ventilation floor in the grinding chamber.
  • Allen mentioned embodiments is also common that the jet nozzles, which sit in the annular Mahlraumwandung and is introduced by the high-pressure propellant gas, pass through the two-layer structure of Mahlraumwandung (consisting of steel ring and inner lining) and must be carried out even wear-resistant, for example ceramics.
  • the nozzle feedthrough must also be pressure-tight. Each time you repair the grinding chamber lining, the nozzles must also be removed and then reinstalled.
  • a further developed modular spiral jet mill is from the GB-A-2262896 known.
  • two steel outer plates enclose between them a grinding chamber and a distributor chamber annularly surrounding the grinding chamber.
  • the grinding chamber is lined with a bottom plate and a cover plate under friction, which clamp between them a nozzle ring, which delimits the grinding chamber laterally towards the distribution chamber.
  • cover plate and nozzle ring made of wear-resistant material such. As PTFE or ceramic.
  • the use of high-tension steam at temperatures of up to 350 ° C. - for example in the fine grinding of titanium dioxide pigment - causes a significant thermal load when the mill starts up.
  • the preferably used wear-resistant materials such as carbides, nitrides or carbide are known to be very brittle. Due to the different thermal expansion behavior of the different materials in the housing and lining, it can therefore quickly come to break the wear protection. In addition, because of the different moduli of elasticity of the carrier and coating material, there is a risk that the coated parts will easily crack when exposed to stress, resulting in flaking of the wear layer.
  • the invention has for its object to provide a spiral jet mill for crushing powdery materials, the wear-resistant and, moreover, largely pressure shock resistant and insensitive to thermal shock, requires reduced repair effort and provides improved grinding quality.
  • the modular jet mill according to the invention is constructed from an outer housing and a grinding housing freely embedded in the outer housing. Both the outer housing and the grinding housing is a separate and - apart from the supply and discharge - a self-contained housing.
  • the label "stored free” means that the grinding housing and outer housing are not firmly connected.
  • the outer housing is made of steel as known.
  • the grinding housing is made entirely of wear-resistant material and is characterized by a special construction.
  • a mill made entirely of, for example, silicon carbide is only limited because of its brittleness can be used.
  • the housing itself consists of two layers: the first of a carrier material, usually steel, and the second of an applied on the carrier material inside lining of wear-resistant material.
  • the Mahlgepatuse invention is completely made of a wear-resistant material.
  • carbides come (known as Widia ® z. B. WC-Co alloy), silicon carbide, boron carbide or other suitable carbides and nitrides, borides, or other ceramics or hard metal.
  • the wear-resistant materials can also be used in combination with each other. This construction is only possible because the grinding housing is self-supporting, stored without a fixed connection and stress-free in the outer housing
  • the grinding housing consists of at least four parts. In a horizontally positioned mill, these are the bottom, the annular side wall, the lid with the molded product discharge nozzle and the Mahlguteinstutzen. In the lid is located next to the product discharge nozzle, the opening for the Mahlguteintrag. The bottom, side wall, lid and grinding material inlets are non-positively touching each other without a special seal. The entire multi-part grinding housing is tension-free within the outer housing. The mill can also be set up vertically.
  • the space between the outer housing and Mahlgeophuse- sidewall serves as a ring-shaped high-pressure propellant gas passage.
  • the propellant gas is passed via one or more nozzles first into the annular propellant gas channel between the outer and inner housings and further via simple bores in the ring of the grinding housing (grinding chamber wall) into the interior of the grinding housing, the grinding chamber. It is in no case necessary to line the holes with a special wear protection or to take special measures for sealing, as is necessary in the known mills, because there nozzles are installed.
  • connection of the parts of the outer housing and the Mahlgephaseuses to a pressure-resistant mill via screws or clamps on the outer circumference of the outer housing.
  • the screwing or the clamping has the advantage that the mill for cleaning or maintenance can be very easily and very quickly opened and closed again.
  • the individual parts of the grinding housing are simply lifted out or inserted. In this way, the propellant channel is directly accessible and can be easily cleaned.
  • the parts of the wear-resistant grinding housing - bottom, side wall, lid - can also be further divided into segments, if the one-piece production of sintered material causes problems because of excessive size of the parts.
  • the segments are joined together in such a way that the grinding housing is tight in itself and lies stress-free in the outer housing.
  • nozzles especially Laval nozzles.
  • the nozzles are installed by known techniques; For example, with the help of special lugs can be used with tapped holes that receive the nozzles. High-tension steam, air or other gases can be used as the gas.
  • the pressure (up to approx. 35 bar) and the temperature (up to approx. 350 ° C) must be adapted to the respective regrind and the desired grinding fineness.
  • the surface of the grinding chamber interior can be designed arbitrarily. In the general case it is smooth. Under certain grinding conditions, it is for the grinding quality advantageous to perform the surface on the bottom plate or on the other interior surfaces and in the Mahlguteintragsstutzen structured, ie provided with grooves, grooves, waves, knobs or the like. For example, it has been found in the fine grinding of titanium dioxide pigments that such a structured Mahlhuntober Phantom the optical properties of the pigment such as gloss can be influenced.
  • the spiral jet mill is used for the fine grinding of titanium dioxide pigment particles, wherein highly stressed steam is used as the propellant gas.
  • the mill is also capable of finely milling other materials such as pigments and dyes in general or other materials such as inorganic and metal oxides, toners, mineral fillers (carbonate, chalk, talc, etc.), detergents, pharmaceuticals, foods, cosmetics, Fertilizers, herbicides, pesticides, insecticides, fungicides, sewage sludge etc.
  • FIG. 1 shows in plan view the spiral jet mill according to the invention with regrind entry (1) and injector inlet (3) into the grinding chamber (7) and the centrally arranged product discharge (2).
  • the propellant gas supply (4) takes place peripherally through the outer housing (13, 14) in the propellant gas channel (5).
  • the side wall of the grinding housing, the Mahlge Reifening (8) is provided with holes (6) for the introduction of propellant gas into the grinding chamber (7).
  • FIG. 2a the section AB is shown for better understanding as an exploded view.
  • FIG. 2b shows the detail X from FIG. 2a.
  • the outer steel housing is designed as a shell (14) and cover (13) with formed product discharge nozzle (18) and mill feed / injector inlet nozzle (20), shown in Figure 3a).
  • the grinding housing therein made of wear-resistant material, consists of bottom (10), ring (8) and lid (9) also with molded product discharge nozzle (9a) and from the Mahlguteintragsstutzen (19), which is shown in Figure 3a / b.
  • Between outer shell (14) or cover (13) and Mahlge Reifening (8) is the propellant gas channel (5).
  • the grinding chamber (7) Inside the grinding housing is the grinding chamber (7). Only during assembly, the break-sensitive meal housing cover (9) on the product discharge nozzle (18) is positioned with fixing screws.
  • the propellant gas supply (4) into the propellant gas channel (5) can take place via one or more inlet nozzles.
  • the supply takes place via a plurality of supply lines in order to introduce the required amount of gas without interference and without pressure loss in the propellant gas channel.
  • Figure 1 shows how the Mahlge Reifening (8) relative to the Mahlgebiruseboden ((10) in Figure 2a) by means of a fixing pin (16), which is loosely inserted in a recess of Mahlge Reifening (8) and outer housing bottom (14) fixed.
  • the outer housing cover (13) can then, without the mill would have to be opened by up to 180 ° relative to the grinding chamber ring (8) are rotated so that different geometric arrangements of Mahlguteintrag tomaschinesung are adjustable in the grinding chamber.
  • the number of holes or nozzles (6) depends on the Mahlschtician. For example, you can work with 16 nozzles for a smaller diameter of eg 200 mm with 4 nozzles and larger diameters of about 1000 mm. However, other combinations are possible.
  • the angle of the holes (6) in the Mahlge Reifeningwandung (8) is selected with regard to the material to be ground and the desired grinding quality. The person skilled in the art knows the relationships between nozzle or Bohrungsanstellwinkel, number of nozzles, Propellant gas pressure, throughput etc. and grinding fineness of the different products. Due to the modular structure of the overall mill and the grinding housing in particular, the angle of attack as the number of holes or nozzles can be easily changed by replacing the Mahlge Reifenings or individual segments.
  • the contact surfaces of the individual parts of the grinding housing (8, 9, 10) with each other are ground self-sealing.
  • a seal such as a graphite gasket.
  • the surface tolerances of the outer housing and the milling housing differ by one to two orders of magnitude. Therefore, it is advantageous, but not necessary, between the Mahlgebiruseboden (10) and outer housing bottom (14) or between the Mahlgebirusedeckel (9) and outer housing cover (13) each insert a compensating foil (12), which produces a positive connection.
  • the entire mill is held together by screw clamps (15) on the outer circumference.
  • both the grinding housing (8, 9, 10, 19) as the high-pressure propellant gas duct (5) is pressure-tight sealed.
  • outer housing shell (14) and outer housing cover (13) contain one or more vent holes (17), which derive the overpressure that arises during heating between the outer housing and Mahlgephaseuse, and thus enable a voltage-free operation.
  • FIG. 3a shows a side view of the Mahlguteintrag along section CD.
  • FIG. 3b shows the detail Y from FIG. 3a.
  • the material to be ground (1) is supplied via a funnel and introduced by means of the injector gas flow (3) obliquely into the grinding chamber (7).
  • the wear-resistant Mahlguteintragsstutzen (19) is designed as loose in the entry socket of the outer housing (20) inserted socket, which is positioned only during the installation process with a fixing screw.
  • the jet mill according to the invention is insensitive to thermal shock and largely resistant to pressure shock.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Disintegrating Or Milling (AREA)
  • Crushing And Grinding (AREA)
  • Surgical Instruments (AREA)
  • Liquid Crystal Substances (AREA)
EP03025553A 2002-11-12 2003-11-08 Spiralstrahlmühle Revoked EP1419823B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10252441 2002-11-12
DE10252441 2002-11-12

Publications (3)

Publication Number Publication Date
EP1419823A2 EP1419823A2 (de) 2004-05-19
EP1419823A3 EP1419823A3 (de) 2006-01-11
EP1419823B1 true EP1419823B1 (de) 2007-09-05

Family

ID=32115451

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03025553A Revoked EP1419823B1 (de) 2002-11-12 2003-11-08 Spiralstrahlmühle

Country Status (5)

Country Link
US (1) US7150421B2 (ja)
EP (1) EP1419823B1 (ja)
JP (1) JP2004160456A (ja)
AT (1) ATE372171T1 (ja)
DE (2) DE10352039B4 (ja)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20210316232A1 (en) * 2018-06-15 2021-10-14 W.R. Grace & Co.-Conn. Defoamer active, manufacturing thereof, and deforming formulation

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI376354B (en) * 2003-12-03 2012-11-11 Miike Tekkosho Kk An apparatus for smashing organic substance particles
DE102006023193A1 (de) * 2006-05-17 2007-11-22 Nied, Roland, Dr.-Ing. Verfahren zur Erzeugung feinster Partikel mittels einer Strahlmühle
DE102006048850A1 (de) 2006-10-16 2008-04-17 Evonik Degussa Gmbh Amorphe submicron Partikel
DE102006048864A1 (de) * 2006-10-16 2008-04-17 Roland Dr. Nied Verfahren zur Erzeugung feinster Partikel und Strahlmühle dafür sowie Windsichter und Betriebsverfahren davon
DE102006048865A1 (de) * 2006-10-16 2008-04-17 Roland Dr. Nied Verfahren zur Erzeugung feinster Partikel und Strahlmühle dafür sowie Windsichter und Betriebsverfahren davon
JP5154103B2 (ja) * 2007-03-08 2013-02-27 キョーリンフード工業株式会社 ジェットミル及びその製造方法
US7398934B1 (en) * 2007-05-15 2008-07-15 E.I. Du Pont De Nemours And Company Deep-chamber, stepped, fluid-energy mill
JP5091889B2 (ja) * 2009-02-27 2012-12-05 三菱重工業株式会社 動物固定装置及び動物固定方法
US20130101488A1 (en) * 2011-10-19 2013-04-25 General Electric Company Optimized boron powder for neutron detection applications
CN109078734B (zh) * 2018-08-07 2020-03-13 中国农业大学 短程射流共点交汇对撞阀
JPWO2023067655A1 (ja) * 2021-10-18 2023-04-27

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US2032827A (en) * 1933-11-21 1936-03-03 Internat Pulverizing Corp Method of and apparatus for providing material in finely divided form
GB636503A (en) * 1947-11-21 1950-05-03 Henry Adam Procter Improvements in or relating to the grinding or pulverizing of minerals and similar materials
US2690880A (en) * 1951-04-10 1954-10-05 Freeport Sulphur Co Rectilinear pulverizer
US2735421A (en) * 1951-10-22 1956-02-21 Shaping of bodies of crystalline carbon
US3559895A (en) * 1968-02-20 1971-02-02 Edwin F Fay Apparatus for and method of comminuting solid materials
BE793588A (fr) * 1972-01-03 1973-06-29 Geochemical Services Holdings Broyeur servant a reduire le calibre d'une matiere particulaire
DE7617063U1 (de) * 1976-05-28 1981-09-03 Nette, Friedrich Wilhelm, 4030 Ratingen Spiralstrahlmuehle
US4056233A (en) * 1976-10-01 1977-11-01 Fay Edwin F Apparatus for pulverizing solid materials
US4248387A (en) * 1979-05-09 1981-02-03 Norandy, Inc. Method and apparatus for comminuting material in a re-entrant circulating stream mill
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DE29909743U1 (de) * 1999-06-04 1999-10-21 Aaslepp Helmut Spiralstrahlmühle in Modulbauweise, mit einem Belüftungsboden + einer Mahlgutaufgabeprallplatte
CN1287023A (zh) * 1999-09-08 2001-03-14 株式会社威士诺 喷射式粉碎机

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20210316232A1 (en) * 2018-06-15 2021-10-14 W.R. Grace & Co.-Conn. Defoamer active, manufacturing thereof, and deforming formulation

Also Published As

Publication number Publication date
DE10352039A1 (de) 2004-05-27
US20040200913A1 (en) 2004-10-14
DE50308103D1 (de) 2007-10-18
DE10352039B4 (de) 2006-03-30
JP2004160456A (ja) 2004-06-10
ATE372171T1 (de) 2007-09-15
US7150421B2 (en) 2006-12-19
EP1419823A2 (de) 2004-05-19
EP1419823A3 (de) 2006-01-11

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