WO2009015965A1 - Process for compacting pyrogenic oxides - Google Patents

Process for compacting pyrogenic oxides Download PDF

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Publication number
WO2009015965A1
WO2009015965A1 PCT/EP2008/058396 EP2008058396W WO2009015965A1 WO 2009015965 A1 WO2009015965 A1 WO 2009015965A1 EP 2008058396 W EP2008058396 W EP 2008058396W WO 2009015965 A1 WO2009015965 A1 WO 2009015965A1
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WO
WIPO (PCT)
Prior art keywords
pressure
gas
powder
valve
compacted
Prior art date
Application number
PCT/EP2008/058396
Other languages
French (fr)
Inventor
Ralph Hofmann
Günter Stein
Dieter Kerner
Original Assignee
Evonik Degussa 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 Evonik Degussa Gmbh filed Critical Evonik Degussa Gmbh
Publication of WO2009015965A1 publication Critical patent/WO2009015965A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B1/00—Packaging fluent solid material, e.g. powders, granular or loose fibrous material, loose masses of small articles, in individual containers or receptacles, e.g. bags, sacks, boxes, cartons, cans, or jars
    • B65B1/20—Reducing volume of filled material
    • B65B1/26—Reducing volume of filled material by pneumatic means, e.g. suction
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B63/00—Auxiliary devices, not otherwise provided for, for operating on articles or materials to be packaged
    • B65B63/02—Auxiliary devices, not otherwise provided for, for operating on articles or materials to be packaged for compressing or compacting articles or materials prior to wrapping or insertion in containers or receptacles
    • B65B63/028—Auxiliary devices, not otherwise provided for, for operating on articles or materials to be packaged for compressing or compacting articles or materials prior to wrapping or insertion in containers or receptacles by pneumatic means
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B13/00—Oxygen; Ozone; Oxides or hydroxides in general
    • C01B13/14—Methods for preparing oxides or hydroxides in general
    • C01B13/145—After-treatment of oxides or hydroxides, e.g. pulverising, drying, decreasing the acidity
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B33/00—Silicon; Compounds thereof
    • C01B33/113—Silicon oxides; Hydrates thereof
    • C01B33/12—Silica; Hydrates thereof, e.g. lepidoic silicic acid
    • C01B33/18—Preparation of finely divided silica neither in sol nor in gel form; After-treatment thereof
    • C01B33/181—Preparation of finely divided silica neither in sol nor in gel form; After-treatment thereof by a dry process
    • 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
    • C09C1/28—Compounds of silicon
    • C09C1/30—Silicic acid
    • C09C1/3009—Physical treatment, e.g. grinding; treatment with ultrasonic vibrations
    • 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
    • C09C3/00—Treatment in general of inorganic materials, other than fibrous fillers, to enhance their pigmenting or filling properties
    • C09C3/04—Physical treatment, e.g. grinding, treatment with ultrasonic vibrations
    • C09C3/046—Densifying, degassing, packaging
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2006/00—Physical properties of inorganic compounds
    • C01P2006/10—Solid density

Definitions

  • the invention relates to a process for compacting pyrogenic oxides.
  • pyrogenic oxides have a low bulk density. Owing to their particular agglomerate structure, they are present in a mixture with a large amount of air. For instance, a pyrogenic silica may have a tamped density of only 20 g/1. Owing to this low tamped density, it is necessary to compact the pyrogenic oxides in order, for example, to save packaging material or other transport costs .
  • the compacted material is removed from the rollers by means of stripping devices and falls downward toward the packaging (DE-B 11 29 459) .
  • DE 3 803 049 discloses filling silo vehicles with high- dispersity pulverulent substances without impairing the performance properties of the filled substance, by filling the silo vessels with the high-dispersity pulverulent substance, for example, by means of a membrane pump and then charging the interior of the silo vessel with an inert gas, for example with compressed air, and then releasing the elevated pressure.
  • an inert gas for example with compressed air
  • the known process has the disadvantage that, owing to the large volume of the silo vehicles, the pressure buildup is not possible instantaneously.
  • Tests with pyrogenic oxides have shown that the more rapidly the compressed air blast can be applied, the greater the compaction can be achieved. The more rapidly the compressed air blast can be applied, the greater is the momentum which acts on the particles and which brings about the compaction.
  • fumed silica is readily refluidizable .
  • US 2004/0112456 Al discloses compacting inorganic free- flowing metal oxide powders which, owing to the high proportion of air incorporated in the particle structure, have a relatively low bulk density, for example titanium dioxide, in order to save transport costs.
  • a gas for example air, is introduced rapidly into the container in which the powder is present, which compacts the powder.
  • the gas pressure at one end of the container can be introduced against the second end of the container.
  • the second end is opened and the compacted powder is driven out of the container when the pressure is released if it is to be treated further.
  • Pyrogenic oxides for example fumed silica
  • fumed silica can be refluidized readily.
  • the process described in US 2004/0112456 Al would be unsuitable for compaction of a fumed silica.
  • the powder to be compacted is introduced into a reactor, which is subsequently closed. Subsequently, via a valve arranged in the lid of the reactor, compressed air is introduced, which compacts the powder. The elevated pressure is then released through a second valve arranged in the lid of the reactor.
  • the pressure was built up within 3 to 5 sec, while the release was effected over a period of 10 to 15 sec. After the pressure release, the compacted powder is removed again from the reactor. It is found that the rapid pressurization is crucial for the significant compaction of the pigment and the bulk density increases with the increase in the pressure.
  • the invention provides a process for compacting pyrogenic oxides in a vessel, the compaction being effected by means of pressurization and subsequent pressure release, which is characterized in that the pressure release after the compaction is carried out through a sintered metal.
  • the pressure release through a sintered metal has the effect that refluidization of the compacted oxide is prevented.
  • the sintered metal may be arranged in the bottom or in the discharge cone of the vessel.
  • the air flow of the expanded gas is directed downward and contributes to a further compaction of the powder.
  • a reduced pressure can be applied.
  • Figure 1 shows a product line 3 which is segmented by gas-tight flaps 6 and 7. Opening the upper flap 6 fills the first segment with uncompacted powder. Subsequently, the two flaps 6 and 7 are closed gas- tight and a pressure surge is applied to the bed via gas-pervious insert 1 in flap 6. After the pressure surge has been applied, the valve through which the insert 1 has been pressurized is closed again.
  • One possible gas-pervious insert 1 is a sintered material, for example sintered metal.
  • no gas can escape through the gas-pervious insert 2 in flap 7, since it is closed via a valve.
  • the powder is compacted from level 4, for example to level 5. After this compaction, opening of the valve on the flap 7 releases the pressure through the gas-pervious insert 2.
  • FIG. 2 shows an inventive apparatus for compacting a powder with a high air holding capacity in combination with a vacuum packer customary on the market.
  • the product line can be segmented by means of the flaps 10 and 14 which are closable gas-tight.
  • the flaps 10 and 14 By opening the upper flap 10, the segment is first filled with uncompacted powder. Subsequently, flaps 10 and 14 are closed gas-tight.
  • the valve 9 is closed.
  • a pressure surge is imparted through the gas-pervious insert 11 in the flap 10 to the powder bed in the tube segment 12 which is thus compacted.
  • the valve 8 is then closed.
  • the pressure in the tube segment 12 is released through the gas-pervious insert 13 in the cone 16.
  • flaps 10 and 14 are then opened and a vacuum packer 15, customary on the market, conveys the compacted bed into a paper sack 15a by means of pneumatic suction.
  • FIG 3 shows an inventive apparatus for compacting a powder with a high air holding capacity in combination with a screw packer 25 customary on the market.
  • the product line can be segmented by means of the flaps 21 and 24 which are closable gas-tight.
  • the flaps 21 and 24 are closed gas-tight.
  • the valve 18 is closed.
  • a pressure surge is imparted through the gas-pervious insert 20 in the flap 21 to the powder bed in the tube segment 23 which is thus compacted.
  • valve 17 is closed.
  • the pressure in the tube segment 23 is released through the gas-pervious insert 19 in the jacketed cone 22.
  • flaps 24 and 21 are opened and a screw packer 25, customary on the market, conveys the compacted bed into a paper sack 26.
  • FIG 4 shows an inventive apparatus for compacting a powder with a high air holding capacity in combination with a vacuum compactor roller customary on the market.
  • the product line can be segmented by means of the flaps 34 and 35 which are closable gas-tight. By opening the upper flap 35, the segment is first filled with uncompacted powder. Subsequently, flaps 34 and 35 are closed gas-tight.
  • the valve 28 is closed. By rapid opening of the valve 27, a pressure surge is imparted through the gas-pervious insert 30 in the jacketed cone 31 to the powder bed in the tube segment 33 which is thus compacted. Thereafter, valve 27 is closed. By opening the valve 28, the pressure in the pipe segment 33 is released through the gas-pervious insert 29 in the jacketed cone 32. Subsequently, flaps 34 and 35 are opened and a vacuum compactor roller 36, customary on the market, compacts the powder bed precompressed by the compressed air surge further.
  • Figure 5 shows an inventive apparatus for compacting a powder with a high air holding capacity in combination with a roller compactor customary on the market.
  • the product line 45 can be segmented by means of the flaps 37 and 38 which are closable gas-tight. By opening the upper flap 37, the segment 45 is first filled with uncompacted powder. Subsequently, flaps 37 and 38 are closed gas-tight. The valve 40 is closed. By rapid opening of the valve 39, a pressure surge is imparted through the gas-pervious insert 44 in the jacketed cone 43 to the powder bed in the tube segment 45, which is thus compacted. Thereafter, the valve 39 is closed.
  • valve 40 By opening the valve 40, the pressure in the pipe segment 45 is released through the gas-pervious insert 41 in the jacketed cone 42. Subsequently, the flaps 37 and 38 are opened and a roller compactor 47, customary on the market, compacts the powder bed precompacted by the compressed air surge to slugs. The conveying into the roller gap of the compactor 47 is effected by means of the conveying screw 46.
  • Figure 6 shows a pressure vessel for the inventive compaction of powder beds.
  • the vessel is filled with a powder bed.
  • the lid 54 is closed gas-tight.
  • the lid 53 is likewise closed gas-tight.
  • the valves 49 and 52 are closed.
  • the valve 48 By opening the valve 48, the powder bed is subjected to a pressure surge in the pressure vessel. As a result, the bed is compacted. Thereafter, the valve 48 is closed.
  • the valves 49 and 52 the pressure is released through the gas-pervious insert 50 in the cylindrical jacket 51 of the pressure vessel.

Abstract

Pyrogenic oxides are compacted by means of a compressed gas pulse.

Description

Process for compacting pyrogenic oxides
The invention relates to a process for compacting pyrogenic oxides.
Pyrogenic oxides, for example fumed silica, are known from Ullmanns Enzyklopadie der technischen Chemie, 4th Edition, Volume 21, pages 464 ff .
These pyrogenic oxides have a low bulk density. Owing to their particular agglomerate structure, they are present in a mixture with a large amount of air. For instance, a pyrogenic silica may have a tamped density of only 20 g/1. Owing to this low tamped density, it is necessary to compact the pyrogenic oxides in order, for example, to save packaging material or other transport costs .
It is known that pulverulent substances can be compacted by applying reduced pressure and mechanical pressure to rotating gas-pervious surfaces. At the same time, the entire filter surface which does not serve for mechanical compaction or is covered with mechanical compacted material moves within a closed casing in the material to be compacted and conveys the material to the compaction site. Before the compaction, the layer thickness of the uncompacted material on the roller is adjusted by means of a scraper.
The compacted material is removed from the rollers by means of stripping devices and falls downward toward the packaging (DE-B 11 29 459) .
DE 3 803 049 discloses filling silo vehicles with high- dispersity pulverulent substances without impairing the performance properties of the filled substance, by filling the silo vessels with the high-dispersity pulverulent substance, for example, by means of a membrane pump and then charging the interior of the silo vessel with an inert gas, for example with compressed air, and then releasing the elevated pressure. For example, in the case of pyrogenic silica, a pressure difference of 2 bar with a rate of pressure change of 0.2 bar/min is employed in order to achieve an increase in the bulk density from 38 g/1 to 80 g/1.
According to DE 38 03 049, the supply of the compressed air and the subsequent pressure release are effected through the same outlet orifice.
The known process has the disadvantage that, owing to the large volume of the silo vehicles, the pressure buildup is not possible instantaneously. Tests with pyrogenic oxides have shown that the more rapidly the compressed air blast can be applied, the greater the compaction can be achieved. The more rapidly the compressed air blast can be applied, the greater is the momentum which acts on the particles and which brings about the compaction. Moreover, especially fumed silica is readily refluidizable .
DE 38 03 049 does not describe a strategy for how the pressure is released without the reversibly compacted powder being refluidized again. In the case of a very rapid pressure release, there would be a very great upward gas flow which loosens the compacted bed again and thus at least partly reverses the compaction result. Tests with fumed silica have shown that, in the course of pressure release, the compaction can be maintained only when the pressure is released very slowly. At the same time, the upward flow of the expanding gas which is enclosed in the powder bed has to be sufficiently low that no particles are entrained or fluidized.
US 2004/0112456 Al discloses compacting inorganic free- flowing metal oxide powders which, owing to the high proportion of air incorporated in the particle structure, have a relatively low bulk density, for example titanium dioxide, in order to save transport costs.
In this case, a gas, for example air, is introduced rapidly into the container in which the powder is present, which compacts the powder.
In this case, the gas pressure at one end of the container can be introduced against the second end of the container. As soon as the pressure has built up, the second end is opened and the compacted powder is driven out of the container when the pressure is released if it is to be treated further.
This procedure has the disadvantage that it is suitable only for powders in which high interparticulate forces prevent refluidization of the powder.
Pyrogenic oxides, for example fumed silica, can be refluidized readily. The process described in US 2004/0112456 Al would be unsuitable for compaction of a fumed silica.
In one variant of the process according to US 2004/0112456 Al, the powder to be compacted is introduced into a reactor, which is subsequently closed. Subsequently, via a valve arranged in the lid of the reactor, compressed air is introduced, which compacts the powder. The elevated pressure is then released through a second valve arranged in the lid of the reactor.
For example, the pressure was built up within 3 to 5 sec, while the release was effected over a period of 10 to 15 sec. After the pressure release, the compacted powder is removed again from the reactor. It is found that the rapid pressurization is crucial for the significant compaction of the pigment and the bulk density increases with the increase in the pressure.
Whether the pressure is built up rapidly or slowly is unimportant for the degree of compaction in US 2004/0112456 Al.
The known process has the disadvantage that, if it is applied to pyrogenic oxides, it would lead to a refluidization of the compacted bed. Beds of pyrogenic oxides are readily refluidizable . For this reason, it very probably makes a difference for this product whether the pressure is built up rapidly or slowly. In the systems described in US 2004/0112456 Al, it is stated explicitly that it has no effect on the compac- tion if the pressure is built up rapidly or slowly.
It is thus an object of the invention to develop a process for compacting pyrogenic oxides which does not have these disadvantages.
The invention provides a process for compacting pyrogenic oxides in a vessel, the compaction being effected by means of pressurization and subsequent pressure release, which is characterized in that the pressure release after the compaction is carried out through a sintered metal.
The pressure release through a sintered metal has the effect that refluidization of the compacted oxide is prevented.
In one embodiment of the invention, the sintered metal may be arranged in the bottom or in the discharge cone of the vessel. In this case, the air flow of the expanded gas is directed downward and contributes to a further compaction of the powder. In one embodiment, a reduced pressure can be applied.
The subject matter of the invention is illustrated in detail with reference to drawing.
Figure 1 shows a product line 3 which is segmented by gas-tight flaps 6 and 7. Opening the upper flap 6 fills the first segment with uncompacted powder. Subsequently, the two flaps 6 and 7 are closed gas- tight and a pressure surge is applied to the bed via gas-pervious insert 1 in flap 6. After the pressure surge has been applied, the valve through which the insert 1 has been pressurized is closed again. One possible gas-pervious insert 1 is a sintered material, for example sintered metal. When the pressure is applied, no gas can escape through the gas-pervious insert 2 in flap 7, since it is closed via a valve. As a result of the pressure surge, the powder is compacted from level 4, for example to level 5. After this compaction, opening of the valve on the flap 7 releases the pressure through the gas-pervious insert 2.
Figure 2 shows an inventive apparatus for compacting a powder with a high air holding capacity in combination with a vacuum packer customary on the market. The product line can be segmented by means of the flaps 10 and 14 which are closable gas-tight. By opening the upper flap 10, the segment is first filled with uncompacted powder. Subsequently, flaps 10 and 14 are closed gas-tight. The valve 9 is closed. By rapid opening of the valve 8, a pressure surge is imparted through the gas-pervious insert 11 in the flap 10 to the powder bed in the tube segment 12 which is thus compacted. The valve 8 is then closed. By opening the valve 9, the pressure in the tube segment 12 is released through the gas-pervious insert 13 in the cone 16. Subsequently, flaps 10 and 14 are then opened and a vacuum packer 15, customary on the market, conveys the compacted bed into a paper sack 15a by means of pneumatic suction.
Figure 3 shows an inventive apparatus for compacting a powder with a high air holding capacity in combination with a screw packer 25 customary on the market. The product line can be segmented by means of the flaps 21 and 24 which are closable gas-tight. By opening the upper flap 21, the segment is first filled with uncompacted powder. Subsequently, flaps 21 and 24 are closed gas-tight. The valve 18 is closed. By rapid opening of the valve 17, a pressure surge is imparted through the gas-pervious insert 20 in the flap 21 to the powder bed in the tube segment 23 which is thus compacted. Thereafter, valve 17 is closed. By opening the valve 18, the pressure in the tube segment 23 is released through the gas-pervious insert 19 in the jacketed cone 22. Subsequently, flaps 24 and 21 are opened and a screw packer 25, customary on the market, conveys the compacted bed into a paper sack 26.
Figure 4 shows an inventive apparatus for compacting a powder with a high air holding capacity in combination with a vacuum compactor roller customary on the market. The product line can be segmented by means of the flaps 34 and 35 which are closable gas-tight. By opening the upper flap 35, the segment is first filled with uncompacted powder. Subsequently, flaps 34 and 35 are closed gas-tight. The valve 28 is closed. By rapid opening of the valve 27, a pressure surge is imparted through the gas-pervious insert 30 in the jacketed cone 31 to the powder bed in the tube segment 33 which is thus compacted. Thereafter, valve 27 is closed. By opening the valve 28, the pressure in the pipe segment 33 is released through the gas-pervious insert 29 in the jacketed cone 32. Subsequently, flaps 34 and 35 are opened and a vacuum compactor roller 36, customary on the market, compacts the powder bed precompressed by the compressed air surge further.
Figure 5 shows an inventive apparatus for compacting a powder with a high air holding capacity in combination with a roller compactor customary on the market. The product line 45 can be segmented by means of the flaps 37 and 38 which are closable gas-tight. By opening the upper flap 37, the segment 45 is first filled with uncompacted powder. Subsequently, flaps 37 and 38 are closed gas-tight. The valve 40 is closed. By rapid opening of the valve 39, a pressure surge is imparted through the gas-pervious insert 44 in the jacketed cone 43 to the powder bed in the tube segment 45, which is thus compacted. Thereafter, the valve 39 is closed. By opening the valve 40, the pressure in the pipe segment 45 is released through the gas-pervious insert 41 in the jacketed cone 42. Subsequently, the flaps 37 and 38 are opened and a roller compactor 47, customary on the market, compacts the powder bed precompacted by the compressed air surge to slugs. The conveying into the roller gap of the compactor 47 is effected by means of the conveying screw 46.
Figure 6 shows a pressure vessel for the inventive compaction of powder beds. First, by opening the lid 54, the vessel is filled with a powder bed. Thereafter, the lid 54 is closed gas-tight. The lid 53 is likewise closed gas-tight. The valves 49 and 52 are closed. By opening the valve 48, the powder bed is subjected to a pressure surge in the pressure vessel. As a result, the bed is compacted. Thereafter, the valve 48 is closed. By opening the valves 49 and 52, the pressure is released through the gas-pervious insert 50 in the cylindrical jacket 51 of the pressure vessel.

Claims

Claim
Process for compacting pyrogenic oxides in a vessel, the compaction being effected by means of pressurization and subsequent pressure release, characterized in that the pressure release after the compaction is carried out through a sintered metal .
PCT/EP2008/058396 2007-07-31 2008-06-30 Process for compacting pyrogenic oxides WO2009015965A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007036387A DE102007036387A1 (en) 2007-07-31 2007-07-31 Process for compacting pyrogenically prepared oxides
DE102007036387.9 2007-07-31

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WO2009015965A1 true WO2009015965A1 (en) 2009-02-05

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WO (1) WO2009015965A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017145047A (en) * 2016-02-18 2017-08-24 大同特殊鋼株式会社 Powder filling device and sintered magnet production device

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3803049C1 (en) * 1988-02-02 1989-02-23 Wacker-Chemie Gmbh, 8000 Muenchen, De Method for filling silo vehicles
EP0360236A2 (en) * 1988-09-23 1990-03-28 Degussa Aktiengesellschaft Process for the manufacture of carbon black beads, and devices for carrying out part of the process
US5749401A (en) * 1995-10-12 1998-05-12 Minolta Co., Ltd. Powder filling method
US20040112456A1 (en) * 2002-12-16 2004-06-17 Bates James William Densification of aerated powders using positive pressure
EP1813574A1 (en) * 2006-01-25 2007-08-01 Degussa GmbH Sheet compacted pyrogenic silicon dioxide

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL136774C (en) 1960-10-01
US3586066A (en) * 1969-05-09 1971-06-22 Vogt Clarence W Method of filling flexible containers

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3803049C1 (en) * 1988-02-02 1989-02-23 Wacker-Chemie Gmbh, 8000 Muenchen, De Method for filling silo vehicles
EP0360236A2 (en) * 1988-09-23 1990-03-28 Degussa Aktiengesellschaft Process for the manufacture of carbon black beads, and devices for carrying out part of the process
US5749401A (en) * 1995-10-12 1998-05-12 Minolta Co., Ltd. Powder filling method
US20040112456A1 (en) * 2002-12-16 2004-06-17 Bates James William Densification of aerated powders using positive pressure
EP1813574A1 (en) * 2006-01-25 2007-08-01 Degussa GmbH Sheet compacted pyrogenic silicon dioxide

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017145047A (en) * 2016-02-18 2017-08-24 大同特殊鋼株式会社 Powder filling device and sintered magnet production device

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