EP2081699A2 - Procédé de production de produits minéraux en poudre fine - Google Patents

Procédé de production de produits minéraux en poudre fine

Info

Publication number
EP2081699A2
EP2081699A2 EP07846319A EP07846319A EP2081699A2 EP 2081699 A2 EP2081699 A2 EP 2081699A2 EP 07846319 A EP07846319 A EP 07846319A EP 07846319 A EP07846319 A EP 07846319A EP 2081699 A2 EP2081699 A2 EP 2081699A2
Authority
EP
European Patent Office
Prior art keywords
air
water
classifier
temperature
relative humidity
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
EP07846319A
Other languages
German (de)
English (en)
Other versions
EP2081699B1 (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
Original Assignee
Calcarb 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 Calcarb AG filed Critical Calcarb 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
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • 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
    • 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
    • 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 process for the production of fine mineral powder products by means of plants consisting of one or more air classifiers, dust collectors such as cyclones and / or filters, at least one fan and connecting these apparatus pipes or channels for air and solids transport.
  • air classifiers such as zig-zag classifiers, air recirculation classifiers, spiral or deflector classifiers can be used.
  • the screening of CaCO 3 with average particle sizes below about 5 ⁇ m occurs frequently . to the .
  • Irradiation of the system parts through which the air / powder mixture flows such as the sifter itself, the air fines or channels and other apparatuses belonging to an air separation unit, such as cyclones, filters and ventilators, have hard, scaly deposits. 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 also lead to imbalances on rotating parts in air classifiers such as the classifying rotors and the fan rotors, which severely limits the operation or leads to high costs for cleaning and / or balancing.
  • 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 the relative humidity (RH) of the classifying air in the range of about 15% to about 50%, preferably 15% to about 35%, is maintained.
  • the RH is measured in the classifier - and / or at other points in the system - and water is introduced into the classifying air as a function of the respective measured value.
  • 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 if part of the (warmer) sighting air is returned from behind the filter to the visible 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 less dry the particles and the walls, the less particles are deposited on the walls.
  • 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 preferably takes place before it enters the detector.
  • a very simple embodiment of the invention is that in the intake duct for the fresh air steam is injected. (Claim 2, Fig.l)
  • 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 0 and 90 C °. (Claim 4)
  • the intake duct is dimensioned such that air speeds of between 1 m / s and 3 m / s are established. (Claim 5)
  • the classifying air is passed through a Luftbefeuchtungsemcardi and thus entered the amount of water required in each case (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 from where • it is taken up by the passing classifying air passes from the inside to the outside of the tube or pipe.
  • 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, Fig. 4) This can be done in a simple manner so that the addition of water on the relative humidity of the exhaust air, its temperature and the temperature of the air is controlled in the air classifier. (Claim 9)
  • the temperature of the classifying air is in practice in the range below 100 0 C.
  • a further improvement achieved in that the temperature of the air in the region of the separator between 30 C ° and 80 C ° is maintained.
  • the effort for the humidification of the air ie the required amount of water and the energy required for the task of water, is 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 air in front of the mill can be humidified (using the methods specified in claims 2 to 4) (claim 11).
  • Fig. 1 shows an embodiment with reference to a simple circuit of a
  • FIG. 2 shows an embodiment in which a partial flow of the air / powder mixture leaving the cyclone is returned to the inlet of the air classifier
  • 3 shows an exemplary embodiment in which both a partial flow of the air / powder mixture leaving the cyclone and also a partial flow of the filter exhaust air are returned to the inlet of the air classifier
  • Fig. 5 shows an exemplary embodiment, in which a dry mill with ventilation is connected upstream of the air classifier
  • FIG. 6 shows an exemplary embodiment with regulation of the humidity of the air in the windscreen.
  • an air separation plant (FIG. 1) consists of an air classifier I 5, a cyclone 2, a filter 3, a fan 4, the pipelines or channels 5 connecting these aggregates, and supply and discharge facilities for feed 6a, fine 6b and coarse material 6c ,
  • the feed material 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 may also enter the air classifier, for example for the purpose of sealing.
  • the relative humidity of the classifying air is maintained in the range of 15% to 35%.
  • Fig.l water is injected for this purpose in the form of vapor or in the form of drops in the intake fresh air at the point A, namely in the fresh air supply 6d.
  • 2 shows an exemplary embodiment in which, in a manner known per se, a partial flow of the air / powder mixture leaving the cyclone 2 is returned behind a cyclone fan 4a through pipes or channels 5a to the fresh air inlet 6d of the air classifier.
  • the air classifier 1 is coupled directly to a ventilated mill 7 and the exhaust air of the mill is guided 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 exemplary embodiments.
  • FIG. 6 explains in principle how the control according to the invention can be carried out in the exemplary embodiment according to FIG. 4.
  • 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.
  • Fineness of the product at 2 ⁇ m 61,30%
  • Classifier speed 3000 rpm 3000 rpm
  • Fineness of the product at 2 ⁇ m 61.90% 54.90%
  • Classifier speed 3000 rev / min flow of air: 9000 m 3 / h
  • Classifier speed 3000 rpm 3000 rpm
  • Air flow 9000 m 3 / h 9000 m 3 / h
  • Fineness of the product at 2 ⁇ m 82.30% 81.30% After one hour of operation, a small “eggshell” formation was found on the inspection door of the plant.
  • Classifier speed 2000 r / min 2000 r / min Air Flow: 12000 m 3 / h 12000 m 3 / h Air temperature: 44 ° C 45 0 C

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)

Abstract

L'invention concerne un procédé de production de produits minéraux en poudre fine au moyen d'installations comprenant un ou plusieurs séparateurs à air, un ou plusieurs séparateurs de poussière tels que des cyclones ou des filtres, au moins un ventilateur et des canalisations ou des tuyauteries reliant ces appareils pour le transport de l'air. L'invention est caractérisée en ce que l'humidité relative de l'air de séparation dans le séparateur à air est maintenue à un pourcentage allant de 15% à 35%.
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 true EP2081699A2 (fr) 2009-07-29
EP2081699B1 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)

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CN103068456B (zh) * 2010-05-10 2015-09-16 热费希尔科学公司 颗粒物监视器
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”,
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
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
NO20091982L (no) 2009-06-09
CN101600514B (zh) 2013-08-14
PT2081699E (pt) 2015-10-30
CN101600514A (zh) 2009-12-09
US20100294863A1 (en) 2010-11-25
MX2009004909A (es) 2009-07-24
RU2009122189A (ru) 2010-12-20
JP2010509041A (ja) 2010-03-25
CA2668949A1 (fr) 2008-05-15
RU2459675C2 (ru) 2012-08-27
KR101385837B1 (ko) 2014-04-16
KR20090089293A (ko) 2009-08-21
JP5147023B2 (ja) 2013-02-20
DK2081699T3 (en) 2015-12-07
US8393557B2 (en) 2013-03-12
NO339418B1 (no) 2016-12-12
DE102006053356A1 (de) 2008-05-15
EP2081699B1 (fr) 2015-08-19
ES2547482T3 (es) 2015-10-06
WO2008055495A3 (fr) 2009-01-22
SI2081699T1 (sl) 2015-10-30
IN266869B (fr) 2015-06-10
WO2008055495A2 (fr) 2008-05-15
PL2081699T3 (pl) 2016-01-29
CA2668949C (fr) 2016-01-05
DE102006053356B4 (de) 2011-03-17
HUE028127T2 (en) 2016-12-28

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