EP2117694A1 - Procédé et dispositif pour le revêtement d'un matériau sous forme de poudre, matériau revêtu et son utilisation - Google Patents

Procédé et dispositif pour le revêtement d'un matériau sous forme de poudre, matériau revêtu et son utilisation

Info

Publication number
EP2117694A1
EP2117694A1 EP07857783A EP07857783A EP2117694A1 EP 2117694 A1 EP2117694 A1 EP 2117694A1 EP 07857783 A EP07857783 A EP 07857783A EP 07857783 A EP07857783 A EP 07857783A EP 2117694 A1 EP2117694 A1 EP 2117694A1
Authority
EP
European Patent Office
Prior art keywords
coated
coating
mixture
gas stream
coating material
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.)
Withdrawn
Application number
EP07857783A
Other languages
German (de)
English (en)
Inventor
Ali Memari Fard
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.)
Cement and Mining Processing (CMP) AG
Original Assignee
Cemag Anlagenbau GmbH
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 Cemag Anlagenbau GmbH filed Critical Cemag Anlagenbau GmbH
Publication of EP2117694A1 publication Critical patent/EP2117694A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B17/00—Sulfur; Compounds thereof
    • C01B17/02—Preparation of sulfur; Purification
    • C01B17/0243—Other after-treatment of sulfur
    • C01B17/0248—Other after-treatment of sulfur of particulate sulfur
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2/00—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic
    • B01J2/006—Coating of the granules without description of the process or the device by which the granules are obtained
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2/00—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic
    • B01J2/02—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic by dividing the liquid material into drops, e.g. by spraying, and solidifying the drops
    • B01J2/04—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic by dividing the liquid material into drops, e.g. by spraying, and solidifying the drops in a gaseous medium
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
    • C01F11/00—Compounds of calcium, strontium, or barium
    • C01F11/18—Carbonates
    • C01F11/185—After-treatment, e.g. grinding, purification, conversion of crystal morphology
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK  ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
    • C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
    • C09C1/02—Compounds of alkaline earth metals or magnesium
    • C09C1/021—Calcium carbonates

Definitions

  • the invention relates to a method for coating powdery material and to an apparatus for carrying out the method.
  • the invention relates to a process for coating CaCO 3 or sulfur.
  • the invention further relates to coated material and its use according to this method.
  • Coating apparatus for powdered material wherein a mixture of a material to be coated and a meltable coating material is produced, the mixture is heated by a stream of air, the mixture is fluidized, wherein the coating of the material to be coated with the coating material, the coating solidifies by cooling and finally the coated material is separated,
  • US 3 711 319 describes a device in which in one
  • Coating chamber the material to be coated is fluidized by a horizontally rotating disc and a gas stream and the coating material is sprayed finely distributed in the coating chamber.
  • An analogous system is described in EP 0544 289.
  • 00/16886 describe a coating of particulate material in a rotor chamber.
  • the liquid coating material is also sprayed finely distributed here.
  • GB 1 253 067 describes a coating process in which a powder is provided with a water-repellent protective layer. The coating takes place in a fluidized bed, which is produced with an eddy current mill. Meltable coating material is melted by a heated stream of air in the fluidized bed.
  • the object of the invention is to provide a method in which finely divided, particulate material is uniformly and thinly coated with a coating material, wherein the degree of melting of the coating material can be controlled.
  • This object is achieved in a method of the type mentioned above in that the heating of the mixture is carried out in a gas stream, which is initially directed vertically upwards and then vertically downwards after a 180 ° bend.
  • the temperature of the gas stream is after the Energy delivery to the material, greater than or equal to the melting point of the coating material.
  • the mixture is preferably accelerated by an increased gas pulse at a taper in the vertically upwardly directed portion of the gas stream, the taper being upstream of the point at which the mixture of the material to be coated and the coating material is applied to the heated gas stream.
  • the material to be coated is preferably selected from inorganic or organic powders, flours, dusts, particles, pigments, granules or tablets. More preferably, the material to be coated is CaCO 3 or sulfur.
  • the CaCO 3 comprises both ground and precipitated or crystalline CaCO 3 .
  • the coating material should be a fusible material solid at room temperature, preferably the coating material is wax or a long-chain organic acid having 11 to 30 carbon atoms, preferably 12 to 20 carbon atoms, particularly preferred is stearic acid, for example technical stearic acid, which is either pure or up to 50% other long-chain organic acids, or fractionated stearic acid.
  • Fractional stearic acid is composed of long chain organic acids of 14 to 20 carbon atoms, the majority being C18 (about 67-68%) and C16 (about 30-32%).
  • the material to be coated should be CaCO 3 and the coating material wax or stearic acid, technical stearic acid or fractionated stearic acid.
  • the method can be divided into three process sections:
  • the material to be coated and the coating material are brought in a mixing and metering device in the appropriate ratio.
  • both are Components dry, but drying can also be done in the second process section described below (by heating).
  • the metering takes place essentially in two separate metering units, for example two (volumetric) metering screws, which lead into a mixing unit.
  • a suitable mixing unit is a paddle mixing screw. In the mixing unit, the mixing of the two components to form a homogeneous mixture. Subsequently, the mixture is conveyed through a conveying member, which forms the pressure end of the second process section, into a downpipe.
  • a rotary valve or other metering, conveying and pressure-closing means can be used as a conveying member.
  • the mixing can also be carried out from the process plant, wherein the finished mixture is then introduced via the rotary valve in the further process. Dosing and mixing usually takes place at ambient pressure.
  • the drop tube forms the transition to the second process section, the coating device.
  • the coating device comprises a heating device and a swirling device.
  • the heating device has a heating element, an air intake or an air blower and a heater tube.
  • the gas stream of the second process section normally has a lower static pressure. Depending on the arrangement of the air intake or of the blower, however, an overpressure in the heater tube may also prevail.
  • the heater tube is generally a vertically rising and then vertically descending tube which is inverted in the upper region U-shaped or bent in several arc sections with interposed pipe sections.
  • the heater tube has in the vertically ascending tube side an inlet opening for the downpipe, which establishes the connection to the mixing unit of the first process section. Upstream of the inlet opening is a taper in the heater tube.
  • the heater tube may include means for generating turbulent flow and / or flow installations.
  • An air blower sucks in ambient air and passes the air through Heating element and in the heater tube, whereby the air is pressed through the heater tube and the swirling device of the second process section and the material separation of the third process section.
  • the air stream may comprise ambient air and / or an inert gas, preferably nitrogen, carbon dioxide and argon.
  • the air intake is preferably adjustable, so that air speed and quantity can be varied.
  • the air blower can be arranged before or after the heating element.
  • a sucking fan is provided at the end of the heater tube, ie after the separation means to be explained.
  • the velocity of the air or gas stream is 15 to 50 m / s, preferably 20 to 35 m / s, particularly preferably 25 to 30 m / s and in particular 29 m / s.
  • the heating element may be a conventional electrical and preferably continuously adjustable heating coil. At the heating element, the air (or gas) is brought to the desired temperature.
  • the desired temperature should be understood as the temperature sufficient to completely liquefy the fusible coating material at the end of the heater tube at the latest. The temperature should therefore be greater than or equal to the melting point of the coating material, preferably a temperature of 50 to 200 ° C, particularly preferably 80 to 125 0 C.
  • the heater tube opens into the swirling device.
  • the length of the heater tube is preferably 1 to 30 m, particularly preferably 10 to 15 m and in particular 11 to 13 m, in each case measured between material inlet opening (downpipe) and swirling device.
  • the heater tube may be variable in length, for example by a telescope system.
  • the material to be coated and the coating material are introduced as a mixture via the downpipe in the heater tube.
  • the introduction of the mixture takes place in a solid state.
  • the velocity of the gas flow is increased, whereby an increased gas pulse results, which accelerates the mixture of material to be coated and coating material in the vertically upwardly running part of the heater tube upwards and thereby dispersed.
  • the heated gas stream softens the coating material and / or melts it into fine droplets, resulting in dispersion of the material to be coated and the coating material in the heater tube.
  • the residence time of the mixture in the heater tube can be varied and controlled.
  • the temperature setting can be supported by different isolation methods.
  • the swirling device, into which the heater tube opens, is preferably an eddy-current mill.
  • the eddy current mill has a gas suction, which is preferably adjustable.
  • the turbulence in the eddy current mill is in a downward movement.
  • impacts occur between the material to be coated and the molten coating material, whereby the material to be coated coats with a thin layer of the coating material.
  • the result is a coated material.
  • a residue of the droplet of the coating material does not adhere to the already coated material.
  • the droplets of the coating material sequentially hit several particles of the material to be coated, each releasing a portion of their mass until the droplets themselves are as small as the particles of the material to be coated and then adhere to a particle.
  • the eddy current mill can assist the air blower, which is located at the beginning of the heater tube, in its conveying work.
  • the gas stream and thus the coated material are cooled.
  • the Cooling of the gas stream carried out at least one further cooling step. This avoids possible sticking of two or more coated particles through softened surfaces or sticking in the coating system.
  • the coated material is separated from the gas stream in the third process section. This can be done in a cyclone.
  • a cooling aid a longer cooling section with several air inlets can be placed in front of the cyclone.
  • a first deposition can not be done in a cyclone, but by an air classifier or directly through a filter.
  • the exhaust air of the air classifier and the cyclone with the coated material can also be fed into the same filter.
  • Another cooling step can be done by transferring the coated material into another cool gas stream.
  • the smallest residues of the coating material and agglomerates can be additionally deposited by a further air classification step.
  • the deposited agglomerates and residues of the coating material can be recycled to the process.
  • the gas stream which is composed of the part that is sucked in via the heating element and the part that is sucked in for cooling from the environment, can be cleaned in a filter and blown back into the environment.
  • the coated product 2 Small amounts of fines of the coated product can be discharged with the gas stream from the cyclone. They can be separated by means of a filter from the first gas stream. The resulting coated material (finished product 2) is much finer than the coated material (finished product 1), which is deposited by means of the cyclone from the first gas stream, or by downstream air classification from the second gas stream. Homogenization of the total product can be done pneumatically.
  • the invention further relates to a coated material obtained by the process according to the invention.
  • the coated material is preferably wax or Stearic acid or technical stearic acid coated CaCO 3 .
  • CaCO 3 coated with wax or stearic acid or technical stearic acid can be used to facilitate the dispersion of CaCO 3 in polymers (see E. Papirer, J. Schultz, C. Turchi, "Surface Properties of a Calcium Carbonate Fil treated with Stearic Acid", European Polymer Journal, Vol. 20, 12, 1984, pp. 1155-1158)
  • the CaCO 3 coated according to the invention is distinguished by a particularly homogeneous dispersibility in polymers because of its fine distribution and its uniform and thin coating.
  • the invention further relates to a device for coating powdery material, comprising a mixing and metering device, a coating device and a separation device for the coated material, wherein the coating device has a heating device, which is connected via an inlet opening with the mixing and metering device is, comprises a swirling device and at least one air intake.
  • the heating device comprises a vertically upwardly running, then vertically downwardly running heater tube.
  • the heater tube has a taper on the vertically upward side below the inlet opening.
  • the heater tube may include means for generating turbulent flow and / or flow installations.
  • the swirling device preferably comprises an eddy-current mill, however, other swirling devices such. B. rotor-stator systems are used.
  • the vortex or eddy current mill has an air intake that can be assisted by compressed air.
  • the air intake is preferably adjustable.
  • the compressed air supports of the eddy current mill can serve as discharge aid and cooling aid for the coated product.
  • Suitable separation devices for the coated material are all particle separation devices known from the prior art; the separation device is preferably a cyclone. Brief description of the drawings
  • FIG. 1 shows a flow diagram of the device according to the invention.
  • CaCO 3 is finely ground stearic in a freely adjustable ratio, preferably 0.5 to 1, 5 wt .-% technical stearic acid and 98.5 to 99.5 wt .-% CaCO 3 in a paddle mixing screw 12th mixed.
  • the metering of the two finely ground components takes place in metering screws 10 and 11, which are connected upstream of the paddle mixing screw 12.
  • the mixture is conveyed by a rotary valve 13 in a downpipe 14.
  • the drop tube 14 opens into a heater tube 15.
  • the heater tube 15 is composed of a vertically rising portion, an inverted U-shaped arc portion and a vertically descending portion.
  • the vertically rising portion of the heater tube 15 16 sucked ambient air 17 is heated to 50 to 200 ° C, preferably 80 to 125 ° C via a heater. Upstream of the mouth of the drop tube 14, the vertically rising tube is tapered. By the taper 18 in the heater tube 15, the gas flow is accelerated so that the mixture of calcium carbonate and stearic acid in the vertically rising portion of the heater tube 15 is accelerated upward and the heated gas, the technical stearic acid is melted into small droplets. The resulting dispersion of calcium carbonate and molten stearic acid is passed in the heater tube 15 through the arcuate portion and the descending portion to an eddy current mill 19 at the lower end of the descending portion of the heater tube 15.
  • the gas flow is swirled in a downward motion. Due to the strong turbulence in the eddy current mill 19, the finely divided calcium carbonate and the molten stearic acid droplets are so strongly swirled that the particles and the droplets touch each other. A droplet covers a particle with a thin layer. The rest of the droplet and the now coated However, particles do not adhere to each other, but each droplet encounters several particles of calcium carbonate until the stearic acid droplet itself is as small as a CaCO 3 particle and adheres to it. After the eddy current mill 19, an air intake 30 takes place on the way to a cyclone separator 20.
  • the discharge of the cyclone is a blow-through lock 24, in which a further cooler air stream 32 further cools the coated product.
  • the secondary process air stream with the coated material is fed to an air separator 25, which deposits agglomerates and discharges them through a rotary valve 26.
  • the coated material (finished product 1) is collected in a further filter 27 and discharged through a further rotary valve 28 from the process. Behind the filter, a fan 29 is mounted, which sucks the secondary process airflow and blows into the environment.
  • the optional compressed air support of the eddy current mill acts as a discharge aid and cooling aid for the coated product.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Glanulating (AREA)

Abstract

L'invention concerne un procédé de revêtement d'un matériau sous forme de poudre avec un matériau de revêtement fusible, notamment de revêtement de CaCO3 avec de l'acide stéarique ou de l'acide stéarique technique. Selon ce procédé, un mélange des matériaux est chauffé dans un courant gazeux de manière à ce que le matériau de revêtement fonde et à ce que le mélange se disperse, le mélange est agité afin de mettre en contact le matériau à revêtir et le matériau de revêtement, le matériau revêtu est refroidi afin de durcir le revêtement et le matériau revêtu est séparé du courant gazeux. Le courant gazeux, dans lequel le mélange est chauffé, est tout d'abord orienté de manière verticale vers le haut, puis de manière verticale vers le bas.
EP07857783A 2006-12-20 2007-12-19 Procédé et dispositif pour le revêtement d'un matériau sous forme de poudre, matériau revêtu et son utilisation Withdrawn EP2117694A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200610060977 DE102006060977A1 (de) 2006-12-20 2006-12-20 Verfahren und Vorrichtung zum Beschichten von pulverförmigem Material
PCT/EP2007/064159 WO2008074811A1 (fr) 2006-12-20 2007-12-19 Procédé et dispositif pour le revêtement d'un matériau sous forme de poudre, matériau revêtu et son utilisation

Publications (1)

Publication Number Publication Date
EP2117694A1 true EP2117694A1 (fr) 2009-11-18

Family

ID=39315572

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07857783A Withdrawn EP2117694A1 (fr) 2006-12-20 2007-12-19 Procédé et dispositif pour le revêtement d'un matériau sous forme de poudre, matériau revêtu et son utilisation

Country Status (3)

Country Link
EP (1) EP2117694A1 (fr)
DE (1) DE102006060977A1 (fr)
WO (1) WO2008074811A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11142488B2 (en) * 2011-02-09 2021-10-12 Everris International B.V. Methods and systems for coating granular substrates
CN113416046B (zh) * 2021-08-13 2022-12-02 中铁七局集团第三工程有限公司物贸分公司 正交异形钢桥面铺装用超高性能混凝土

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB728698A (en) * 1951-12-21 1955-04-27 Blanc Omya Sa Du Process for the treatment of natural calcium carbonates, and the products obtained by this process
US3110626A (en) * 1961-08-17 1963-11-12 Minnesota Mining & Mfg Apparatus for coating discrete solid material
GB1070975A (en) * 1963-11-04 1967-06-07 Magyar Asvanyolaj Es Foeldgaz Process for the execution of exothermic gas reactions assisted by granular catalysts
FR1583182A (fr) * 1967-11-30 1969-10-24
US4746547A (en) * 1986-12-29 1988-05-24 Ga Technologies Inc. Method and apparatus for circulating bed coater
EP0510890B1 (fr) * 1991-04-23 1995-07-26 Ecc International Limited Broyage à sec
TR199801272A2 (xx) * 1998-07-02 2000-02-21 Öğreti̇ci̇ Celaletti̇n Mikronize minerallerin, çekiçli değirmenlerde yağ asitleriyle kaplanması.

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2008074811A1 *

Also Published As

Publication number Publication date
DE102006060977A1 (de) 2008-06-26
WO2008074811A1 (fr) 2008-06-26

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