EP2081699B1 - Procédé de production de produits minéraux en poudre fine - Google Patents

Procédé de production de produits minéraux en poudre fine Download PDF

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Publication number
EP2081699B1
EP2081699B1 EP07846319.7A EP07846319A EP2081699B1 EP 2081699 B1 EP2081699 B1 EP 2081699B1 EP 07846319 A EP07846319 A EP 07846319A EP 2081699 B1 EP2081699 B1 EP 2081699B1
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EP
European Patent Office
Prior art keywords
air
classifier
water
temperature
inlet duct
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.)
Active
Application number
EP07846319.7A
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German (de)
English (en)
Other versions
EP2081699A2 (fr
Inventor
Ulrich Schindler
Christoph Bauer
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.)
Omya International AG
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Omya International 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.)
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Publication date
Application filed by Omya International AG filed Critical Omya International AG
Priority to PL07846319T priority Critical patent/PL2081699T3/pl
Priority to SI200731689T priority patent/SI2081699T1/sl
Publication of EP2081699A2 publication Critical patent/EP2081699A2/fr
Application granted granted Critical
Publication of EP2081699B1 publication Critical patent/EP2081699B1/fr
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B9/00—Combinations of apparatus for screening or sifting or for separating solids from solids using gas currents; General arrangement of plant, e.g. flow sheets
    • B07B9/02—Combinations of similar or different apparatus for separating solids from solids using gas currents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B11/00—Arrangement of accessories in apparatus for separating solids from solids using gas currents
    • B07B11/02—Arrangement of air or material conditioning accessories
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B11/00—Arrangement of accessories in apparatus for separating solids from solids using gas currents
    • B07B11/04—Control arrangements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B17/00—Methods preventing fouling
    • B08B17/02—Preventing deposition of fouling or of dust

Definitions

  • the invention relates to a method according to claim 1 for the production of fine mineral powder products by means of plants which consist of one or more air classifiers.
  • air classifiers such as zig-zag classifiers, air recirculation classifiers, spiral or deflection classifiers can be used.
  • the wallings of the equipment parts through which the air / powder mixture flows such as the sifter itself, the air fine-material pipes or other apparatuses belonging to an air separation system, frequently appear such as cyclones, filters and fans hard, shelled deposits on.
  • These deposits usually grow into shell-like deposits (so-called "eggshells"), but also to tooth-like structures, until they peel off from the walls from time to time and contaminate the fine product which is usually specified with regard to coarse residues with platelets of up to a few mm in size. This can lead to complaints with high economic damages.
  • Eggshells flat also lead to imbalances on rotating parts in air separators such as the preparerotoren and the fan rotors, which severely limits the operation or leads to high costs for cleaning and / or balancing.
  • the contaminated products are freed by further screening or sieving of the, coarse particles.
  • the object of the invention is therefore to avoid the deposits mentioned above and thus the disadvantages associated with them.
  • the - surprising - solution of this task according to the invention is that a method according to claim 1 is applied.
  • the notifying party has found that eggshells are more pronounced than about 15% at a lower RH of the classifying air. Therefore, according to the invention, the rF of the classifying air is set to a value above approximately 15%.
  • the fresh air drawn in from the surroundings is heated in the classifier. This is especially true when part of the (warmer) classifying air is returned from behind the filter to the classifying air inlet.
  • the relative humidity of the classifying air in the classifier drops to values often below 10% RH. This is especially true for arid areas where the ambient air is naturally very dry, such as in Arizona / USA with a mean annual humidity of 14% RH.
  • the drier the classifying air is, the drier the particles in it naturally are. One should think, that the fewer particles deposit the walls the drier the particles and the walls are.
  • the RH should not be increased above about 35%, otherwise the costs would be too high and the benefits would be too low.
  • the adjustment of the relative humidity takes place before it enters the sifter.
  • a very simple embodiment of the invention is that in the intake duct for the fresh air steam is injected. (Claim 2, Fig.1 )
  • the water can be sprayed under high pressure of 60 to 115 bar and droplet sizes below 30 ⁇ m in the intake. (Claim 3)
  • the water can be preheated to a temperature between 50 C ° and 90 C °. (Claim 4)
  • the intake duct is dimensioned so that adjust air velocities between 1m / s and 3m / s. (Claim 5)
  • the classifying air is passed through an air humidifier and thus the amount of water required in each case registered (claim 6).
  • the air humidifying device preferably has at least one hose or a tube made of material permeable to water, through which water is passed and over whose outer surface the viewing air is passed (claim 7).
  • water passes from the inside to the outside of the hose or pipe, from where it is absorbed by the passing through the classifying air.
  • Such a device is e.g. available from AWS Air Water Systems AG in Villach, Austria.
  • Another embodiment of the invention is characterized in that the majority of the exhaust air of the filter is returned to the intake manifold of the air classifier and the humidification takes place in the return duct. (Claim 8, Figure 4 )
  • the temperature of the classifying air is in the range below 100 ° C.
  • a further improvement according to the invention is achieved in that the temperature of the air is kept in the range of the classifier between 30 C ° and 80 C °. In this temperature range, the effort for humidifying the air, i. the required amount of water and the energy required for the task of water, relatively low.
  • the feed can be fed from a pre-product silo or directly from an upstream dry mill with or without conveying air.
  • the mill exhaust air can advantageously be supplied to the air sifter and the humidification of the air in front of the mill can be carried out (with the methods specified in claims 2 to 4) (claim 11).
  • an air separator ( Fig.1 ) from an air classifier 1, a cyclone 2, a filter 3, a fan 4, the pipes or ducts 5 connecting these aggregates as well as supply and discharge devices for feed 6a, fine 6b and coarse material 6c.
  • the feed is separated into coarse material and fine material.
  • the coarse material is discharged through the coarse material outlet 6c.
  • the fine material which usually represents the desired powder product, separated from the classifying air and further promoted by means of a screw conveyor 5 c.
  • the visible or cyclone exhaust air is dedusted in the filter 3 and sucked by the fan 4 to the outside, the fines dust is fed into the screw conveyor.
  • the fresh air inlet opening 6d can be located directly on the classifier housing or on an upstream fresh air inlet channel. Depending on the type of wind sifter, so-called false air enters into the air classifier, for example for the purpose of training.
  • the relative humidity of the classifying air is maintained in the range of 15% to 35%.
  • water in the form of vapor or in the form of drops is injected into the fresh air sucked in at point A, namely into the fresh air supply 6d.
  • Fig. 2 shows an embodiment in which, in a conventional manner, a partial flow of the cyclone 2 leaving air / powder mixture is fed back behind a cyclone fan 4a through pipes or channels 5a to the fresh air inlet 6d of the air classifier. It has proven to be advantageous that for humidification and cooling of the classifying air required water at the point B, namely in the connecting line between the cyclone fan 4a and the fresh air inlet 6d admit because a sufficiently long way to evaporate the water is given. But even with this circuit can be quite successfully injected water directly into the fresh air inlet 6d.
  • Fig. 3 shows an embodiment in which both a partial flow of the cyclone leaving the air / powder mixture 5a and a partial flow of the filter exhaust air 5b to the fresh air inlet 6d of the air classifier is returned. It proves to be advantageous to give the necessary for humidification and cooling water in the return air flow from the filter 3 at the point C, namely in the connecting line between the fan 4 and the fresh air inlet 6d, since this almost no dust particles are present in the return air which may coagulate with drops and then interfere with the process as coarse wet particles. Even with this air duct, the water, possibly only a partial flow, can be successfully injected directly into the fresh air inlet 6d.
  • the air classifier 1 is coupled directly to a ventilated mill 7 and the exhaust air of the mill through pipes 8 to the fresh air inlet of the classifier. It is advantageous to make the humidification of the air already at the entrance of the mill. This measure can also be coupled with the aforementioned embodiments.
  • Fig. 6 explained in principle how the inventive control in the embodiment according to Fig. 4 can be carried out.
  • the relative humidity and the temperature of the classifier exhaust air are measured behind the filter fan 4 by means of sensors 10, and the temperature of the air at the outlet of the classifier is measured by means of a sensor 9.
  • the relative humidity can be better measured in dust-free air. Based on the known relationships between temperature and water loading, the relative humidity in the classifier itself is calculated from these measured values, and accordingly the supply of water into the return air line 5b is readjusted such that the desired relative humidity in the classifier 1 is established.

Landscapes

  • Combined Means For Separation Of Solids (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
  • Cyclones (AREA)
  • Glass Compositions (AREA)
  • Silicates, Zeolites, And Molecular Sieves (AREA)

Claims (11)

  1. Procédé de fabrication de produits pulvérulents minéraux fins au moyen d'installations constituées d'un ou de plusieurs séparateurs pneumatiques, séparateurs de poussière tels que les cyclones et/ou les filtres, d'au moins un ventilateur ainsi que de conduites ou canaux de transport d'air lesquels relient lesdits dispositifs, caractérisé en ce qu'un organe de réglage (11) permet de régler l'humidité relative de l'air vecteur au sein du séparateur pneumatique de manière à maintenir l'humidité relative de l'air vecteur au sein du séparateur pneumatique dans une fourchette allant de 15 % à 35 %, le produit pulvérulent minéral étant du CaCO3 dont la taille moyenne des particules est inférieure à environ 5 µm.
  2. Procédé selon la revendication 1, caractérisé en ce que l'on injecte de la vapeur dans le canal d'aspiration (6d) destiné à l'air frais.
  3. Procédé selon la revendication 1, caractérisé en ce que l'on injecte de l'eau dans le canal d'aspiration (6d) en la mettant sous haute pression comprise entre 60 et 115 bar, pour ainsi obtenir des gouttes d'une taille < 30 µm.
  4. Procédé selon la revendication 3, caractérisé en ce que l'on préchauffe ladite eau, préalablement à son injection, à des températures comprises entre 50 °C et 90 °C.
  5. Procédé selon les revendications 3 et 4, caractérisé en ce que le canal d'aspiration (6d) est dimensionné tel que l'on obtient des vitesses d'air entre 1 m/s et 3 m/s.
  6. Procédé selon la revendication 1, caractérisé en ce que l'on fait passer ledit air vecteur à travers un dispositif d'humidification d'air ce qui permet d'introduire la quantité d'eau requise en l'occurrence.
  7. Procédé selon la revendication 6, caractérisé en ce que ledit dispositif d'humidification d'air comporte au moins un tuyau ou un tube lequel est réalisé en un matériau perméable à l'eau et par lequel on fait passer ladite eau tout en faisant passer ledit air vecteur sur sa surface extérieure.
  8. Procédé selon les revendication 1 à 7, caractérisé en ce que la majeure partie des effluents gazeux du filtre (3) est recyclée dans la conduite d'aspiration (6d) du séparateur pneumatique, l'humidification étant alors effectuée dans le canal de recyclage (5b, Fig. 4).
  9. Procédé selon les revendications 1 à 8, caractérisé en ce que l'ajout d'eau est réglé à travers l'humidité relative des effluents gazeux, à travers la température de ces derniers et à travers la température de l'air au sein du séparateur pneumatique.
  10. Procédé selon les revendications 1 à 9, caractérisé en ce que l'on maintient la température de l'air au sein du séparateur pneumatique dans une fourchette allant de 30 °C à 80 °C en faisant varier la proportion d'air recyclé et la température de l'eau ajoutée.
  11. Procédé selon la revendication 1, un broyeur à sec étant disposé directement en amont dudit séparateur pneumatique, et les effluents gazeux dudit broyeur étant acheminés vers le séparateur pneumatique, caractérisé en ce que l'air est humidifié avant de passer par ledit broyer disposé en amont.
EP07846319.7A 2006-11-10 2007-11-12 Procédé de production de produits minéraux en poudre fine Active EP2081699B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PL07846319T PL2081699T3 (pl) 2006-11-10 2007-11-12 Sposób wytwarzania drobnoziarnistych mineralnych produktów proszkowych
SI200731689T SI2081699T1 (sl) 2006-11-10 2007-11-12 Postopek za proizvodnjo finih mineralnih praškastih proizvodov

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006053356A DE102006053356B4 (de) 2006-11-10 2006-11-10 Verfahren zur Herstellung feiner mineralischer Pulverprodukte
PCT/DE2007/002035 WO2008055495A2 (fr) 2006-11-10 2007-11-12 Procédé de production de produits minéraux en poudre fine

Publications (2)

Publication Number Publication Date
EP2081699A2 EP2081699A2 (fr) 2009-07-29
EP2081699B1 true EP2081699B1 (fr) 2015-08-19

Family

ID=39277651

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07846319.7A Active EP2081699B1 (fr) 2006-11-10 2007-11-12 Procédé de production de produits minéraux en poudre fine

Country Status (18)

Country Link
US (1) US8393557B2 (fr)
EP (1) EP2081699B1 (fr)
JP (1) JP5147023B2 (fr)
KR (1) KR101385837B1 (fr)
CN (1) CN101600514B (fr)
CA (1) CA2668949C (fr)
DE (1) DE102006053356B4 (fr)
DK (1) DK2081699T3 (fr)
ES (1) ES2547482T3 (fr)
HU (1) HUE028127T2 (fr)
IN (1) IN266869B (fr)
MX (1) MX2009004909A (fr)
NO (1) NO339418B1 (fr)
PL (1) PL2081699T3 (fr)
PT (1) PT2081699E (fr)
RU (1) RU2459675C2 (fr)
SI (1) SI2081699T1 (fr)
WO (1) WO2008055495A2 (fr)

Families Citing this family (10)

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EP2569069B1 (fr) * 2010-05-10 2019-04-10 Thermo Fisher Scientific Inc. Système de surveillance de particules
CN102773173A (zh) * 2012-07-30 2012-11-14 四川石棉巨丰粉体有限公司 重质碳酸钙的分级方法
CN104308165A (zh) * 2014-08-29 2015-01-28 北京京磁永磁科技发展有限公司 一种气流磨机
US10287171B2 (en) * 2016-05-05 2019-05-14 Rec Silicon Inc Tumbling device for the separation of granular polysilicon and polysilicon powder
IT201700095977A1 (it) * 2017-08-24 2019-02-24 Polibiotech Srl “metodo ed apparato a flusso di gas guidato per la produzione, separazione e classificazione di piccole particelle”,
EP3466629B1 (fr) 2017-10-05 2021-08-04 Precision Surfacing Solutions GmbH Scie à fil de coupe de tranche
JP2018114505A (ja) * 2018-05-01 2018-07-26 株式会社リョーシン 風力選別システム
JP6612418B1 (ja) * 2018-11-26 2019-11-27 株式会社金星 ガス搬送式微粉体定量供給方法およびシステム
FR3102375B1 (fr) * 2019-10-24 2023-09-08 Addup Dispositif de séparation de particules pour fabrication additive et appareil de fabrication additive
KR102294881B1 (ko) * 2020-03-09 2021-08-26 김지영 슝기트를 포함하는 양계용 사료 조성물

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Also Published As

Publication number Publication date
HUE028127T2 (en) 2016-12-28
JP5147023B2 (ja) 2013-02-20
ES2547482T3 (es) 2015-10-06
WO2008055495A3 (fr) 2009-01-22
DE102006053356B4 (de) 2011-03-17
US8393557B2 (en) 2013-03-12
IN266869B (fr) 2015-06-10
SI2081699T1 (sl) 2015-10-30
MX2009004909A (es) 2009-07-24
CN101600514A (zh) 2009-12-09
NO339418B1 (no) 2016-12-12
JP2010509041A (ja) 2010-03-25
PT2081699E (pt) 2015-10-30
PL2081699T3 (pl) 2016-01-29
CA2668949C (fr) 2016-01-05
RU2009122189A (ru) 2010-12-20
EP2081699A2 (fr) 2009-07-29
CN101600514B (zh) 2013-08-14
DK2081699T3 (en) 2015-12-07
NO20091982L (no) 2009-06-09
KR20090089293A (ko) 2009-08-21
RU2459675C2 (ru) 2012-08-27
WO2008055495A2 (fr) 2008-05-15
DE102006053356A1 (de) 2008-05-15
US20100294863A1 (en) 2010-11-25
KR101385837B1 (ko) 2014-04-16
CA2668949A1 (fr) 2008-05-15

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