WO2008145100A2 - Procédé et dispositif de production d'un granulat métallique - Google Patents

Procédé et dispositif de production d'un granulat métallique Download PDF

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Publication number
WO2008145100A2
WO2008145100A2 PCT/DE2008/000880 DE2008000880W WO2008145100A2 WO 2008145100 A2 WO2008145100 A2 WO 2008145100A2 DE 2008000880 W DE2008000880 W DE 2008000880W WO 2008145100 A2 WO2008145100 A2 WO 2008145100A2
Authority
WO
WIPO (PCT)
Prior art keywords
gas
gas stream
temperature
inlet temperature
gas inlet
Prior art date
Application number
PCT/DE2008/000880
Other languages
German (de)
English (en)
Other versions
WO2008145100A3 (fr
Inventor
Johannes Becker
Rudolf Kraus
Original Assignee
Dorst Technologies Gmbh & Co. Kg
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 Dorst Technologies Gmbh & Co. Kg filed Critical Dorst Technologies Gmbh & Co. Kg
Publication of WO2008145100A2 publication Critical patent/WO2008145100A2/fr
Publication of WO2008145100A3 publication Critical patent/WO2008145100A3/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F9/00—Making metallic powder or suspensions thereof
    • B22F9/02—Making metallic powder or suspensions thereof using physical processes
    • B22F9/026—Spray drying of solutions or suspensions

Definitions

  • the invention relates to a method for producing a metal granulate with the preamble features according to claim 1 or to an arrangement for producing a metal granulate with the Oberbegriffliehen features according to claim 8.
  • WO 02/079532 A2 describes a process for the production of carbide granules.
  • the starting point in this method is that in a spray tower as a spray device, a slurry of a hard metal as a metal component and a liquid phase and from binders is separated by spraying to droplets and the droplets are passed through a hot gas stream to dry the droplets to the metal granules ,
  • the gas flow in this case has a gas inlet temperature into the spray device and a gas outlet temperature from the spray device.
  • Gas inlet temperature in the spray tower is in a range of about 160 to 220 0 C and the gas outlet temperature is on exit from the sprayer in a range of about 85 to 130 0 C.
  • the slip according to WO 02/079532 A2 is sprayed and dried in the spray tower from a cylindrical and a conical section without using a water-soluble long-chain polyglycol, wherein the spray tower is designed and operated in such a way that the number ratio of the over sludge amount of water supplied in liters per hour to the tower volume in m 3 in the range between 0.5 and 1.8 and that a maximum of 0.17 kg wet sludge or slurry per m 3 supplied drying gas are atomized, the slurry has a solids content in the range of 65 to 85 wt .-%.
  • pure water is used as the liquid phase in this procedure.
  • the object of the invention is to propose an alternative method for producing a metal granulate or an arrangement for carrying out such a method.
  • a method for producing a metal granulate in which a slurry of at least one metal component and at least one liquid phase based on water is separated by spraying into drops in a spraying apparatus, is preferably passed through a gas stream for drying the droplets to the metal granules , and the gas stream having a gas inlet temperature introduced into the spray device and with a
  • Gas outlet temperature is discharged from the spray device, wherein the gas inlet temperature grappel'er than the
  • Gas outlet temperature wherein the gas stream with a gas inlet temperature greater than 23O 0 C is initiated.
  • the gas stream is preferably introduced with a gas inlet temperature greater than 240 0 C, more preferably is the
  • Gas stream having a gas inlet temperature (Tl) of 250 0 C or more and in particular of up to 300 0 C initiated.
  • Tl gas inlet temperature
  • a cemented carbide component may be used in the slurry.
  • water without long-chain polyglycol can be used as the at least one metal component.
  • the slurry is preferably used at a solids content in the range of 65 to 85, especially about 75 weight percent.
  • a spraying device which is designed to separate a slurry of at least one metal component and at least one water-based liquid phase into drops by spraying, and with one
  • a heater configured to introduce a gas stream having a gas inlet temperature into the spray device and discharging it at a gas outlet temperature from the spray device, wherein the gas inlet temperature is greater than the gas outlet temperature, and wherein the spray device and the heater are arranged to dry the droplets to the metal granules the drops through the gas stream to guide, wherein the spraying device and the heating device are arranged such that the Gasstror ⁇ with a gas inlet temperature greater than 23O 0 C is introduced.
  • the spraying device and the heating device are preferably arranged such that the droplets are passed through at least a portion of the gas stream having a preferred temperature greater than 230 0 C, in particular a preferred temperature greater than or equal to 25O 0 C.
  • Metal granules takes place. This applies in particular to the production of a cemented carbide granulate in a spray tower. According to first experiments particularly good results were achieved at a gas inlet temperature of 250 0 C.
  • a gas inlet temperature of 250 0 C offers in conventional dimensions of a spray tower as the spray device and the usual conditions of the slurry according to the first experiments a particularly good compromise between an energy input to be charged for heating the gas stream and a drying efficiency, at the same time an oxidation of the metal granules can be kept to an acceptable level, which presses and sinters high quality pressed parts.
  • gas inlet temperatures of already 230 0 C, and gas inlet temperatures provide positive results in the manufacture of a metal granulate of well over 250 0 C.
  • the ideal gas inlet temperature will depend on the other variable adjustable parameters used, such as the sludge solids content, the spray tower volume, and the amount and flow rate of the gas stream.
  • the arrangement is preferably constructed so that the drops are passed through at least a portion of the gas stream having a temperature greater> 23O 0 C, in particular a temperature greater than or equal to> 250 0 C.
  • a temperature range prevails in a spray tower usually in the region of the gas flow inlet when the gas inlet temperature has this temperature. This is especially true for a spray device in conjunction with a heater which allows a countercurrent of the gas stream, which is introduced by the heater in the spray device, and the drops, which are sprayed from a nozzle of a spray ore into the spray device.
  • FIG. 1 shows a spraying device with a spray tower and a heating device coupled thereto for producing a metal granulate from slip.
  • the arrangement consists of a spray tower 7 as an exemplary spray device 3.
  • the slurry 2 can be provided as an example of an exemplary slip ⁇ supply device 4, in order to be pumped by means of a pump 5 via a spray nozzle with a front nozzle 6 into the interior of a spray tower 7. Through the nozzle 6 while the sprayable flowable slurry 2 is atomized into a plurality of drops 8 or sprayed.
  • the slurry 2 is sprayed upwards from the nozzle 6, so that the drops 8 are first sprayed in an arc shape and then more or less straight in the manner of a fountain and through the spray tower 7 its bottom will fall.
  • the drops 8 dried to the metal granules 1 are let out of the spray tower 7 via an outlet 9.
  • the outlet 9 passes the metal granules 1 for example in a granule silo or sacks as granular 'bearing device 10.
  • a cooling device may be provided which the still warm granules 1 during D ⁇ rchpearss through the outlet 9 or to the granulate Storage device 10 continues to cool.
  • the spray tower 7 shown operates according to the counterflow principle, 'at which the droplets 8 opposite to at least a portion of its movement path to a warm or hot air stream as a gas stream 11 from' be directed in particular heated ambient air ,
  • a gas inlet nozzle in a gas flow inlet region 12 the gas stream 11 is passed from above in the spray tower 7 and through this.
  • the drops 8 thus move first more or less opposite to the flow direction of the gas stream 11 and subsequently rectified with this.
  • air is discharged to lead out the cooled by the condensation effect gas stream 11 back out of the spray tower 7.
  • a separate pump for pumping the gas stream 11 or a combination of a heater 13 may be provided with a corresponding fan.
  • the gas stream 11 thus passes through a closed circuit, which a
  • Forming heater which is in fixed arrangement to the spray tower 7.
  • the heater 13 heats the gas stream 11 so far that a gas inlet temperature Tl 230 0 C or more, preferably about 25O 0 C. Due to the usual dimensions of a typical spray tower 7, a gas outlet temperature T2 when leaving the spray tower 7 is correspondingly much smaller than the gas inlet temperature T1. Preferably, in the spray tower 7 at least in a region of the gas flow 11 there is a preferred temperature T3> 230 ° C., in particular> 250 0 C.
  • this region with the preferred temperature T3 is preferably in the upper region of the spray tower, in which describe the drops 8 an arcuate trajectory and caught up for a long time in this temperature range with the preferred temperature T3.
  • the values are selected in accordance with the tower dimensions.
  • parameter ranges can be selected as they have been known for decades and are mentioned, for example, in WO 02/079532 A2. Owing to the higher gas inlet temperature T1 compared to WO 02/079532 A2, the flow rate of air and / or other gases can be reduced with the same slip consistency.

Landscapes

  • Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Drying Of Solid Materials (AREA)
  • Manufacture Of Metal Powder And Suspensions Thereof (AREA)

Abstract

La présente invention concerne un procédé ou un dispositif de conception correspondante permettant la production d'un granulat métallique (1). Selon l'invention, une barbotine (2) qui comprend au moins un composant métallique et au moins une phase liquide à base d'eau, est réduite à l'état de gouttes (8) par pulvérisation dans un dispositif de pulvérisation (3), les gouttes (8) sont guidées à travers un courant gazeux (11) qui permet de les assécher pour former le granulat métallique (1), et le courant gazeux (11) est introduit dans le dispositif de pulvérisation (3) à une température d'entrée de gaz (T1) et expulsé du dispositif de pulvérisation (3) à une température de sortie de gaz (T2), la température d'entrée de gaz (T1) étant supérieure à la température de sortie de gaz (T2) et le courant gazeux (11) étant introduit à une température d'entrée de gaz (T1) supérieure à 230°C.
PCT/DE2008/000880 2007-05-29 2008-05-27 Procédé et dispositif de production d'un granulat métallique WO2008145100A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200710024818 DE102007024818A1 (de) 2007-05-29 2007-05-29 Verfahren und Anordnung zum Herstellen eines Metallgranulats
DE102007024818.2 2007-05-29

Publications (2)

Publication Number Publication Date
WO2008145100A2 true WO2008145100A2 (fr) 2008-12-04
WO2008145100A3 WO2008145100A3 (fr) 2010-02-18

Family

ID=39917223

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE2008/000880 WO2008145100A2 (fr) 2007-05-29 2008-05-27 Procédé et dispositif de production d'un granulat métallique

Country Status (2)

Country Link
DE (1) DE102007024818A1 (fr)
WO (1) WO2008145100A2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10538829B2 (en) 2013-10-04 2020-01-21 Kennametal India Limited Hard material and method of making the same from an aqueous hard material milling slurry

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002079532A2 (fr) * 2001-03-29 2002-10-10 Plansee Tizit Aktiengesellschaft Procede de production d'un granulat en metal dur
US20030124017A1 (en) * 2001-12-19 2003-07-03 Olof Kruse Method of making tungsten carbide based hard metals

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002079532A2 (fr) * 2001-03-29 2002-10-10 Plansee Tizit Aktiengesellschaft Procede de production d'un granulat en metal dur
US20030124017A1 (en) * 2001-12-19 2003-07-03 Olof Kruse Method of making tungsten carbide based hard metals

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
VUIN A. ; HOLLNACK D. ; WEIDUNG K.: "New additive for the aqueous production of hard metal granulate by spray drying" CFI. CERAMIC FORUM INTERNATIONAL 2006, Seiten E24-E26, XP009127320 ISSN: 0173-9913 [gefunden am 2009-12-15] *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10538829B2 (en) 2013-10-04 2020-01-21 Kennametal India Limited Hard material and method of making the same from an aqueous hard material milling slurry

Also Published As

Publication number Publication date
DE102007024818A1 (de) 2008-12-04
WO2008145100A3 (fr) 2010-02-18

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