EP0289721B1 - Verfahren und Vorrichtung zum kontinuierlichen Dosieren von pulverförmigen Stoffen mittels Pressgas - Google Patents

Verfahren und Vorrichtung zum kontinuierlichen Dosieren von pulverförmigen Stoffen mittels Pressgas Download PDF

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Publication number
EP0289721B1
EP0289721B1 EP88102609A EP88102609A EP0289721B1 EP 0289721 B1 EP0289721 B1 EP 0289721B1 EP 88102609 A EP88102609 A EP 88102609A EP 88102609 A EP88102609 A EP 88102609A EP 0289721 B1 EP0289721 B1 EP 0289721B1
Authority
EP
European Patent Office
Prior art keywords
line
branch
synthetic silica
branch lines
silica
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.)
Expired - Lifetime
Application number
EP88102609A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0289721A2 (de
EP0289721A3 (en
Inventor
Thomas Deuse
Edgar Simon
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.)
Evonik Operations GmbH
Original Assignee
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 Degussa GmbH filed Critical Degussa GmbH
Priority to AT88102609T priority Critical patent/ATE71573T1/de
Publication of EP0289721A2 publication Critical patent/EP0289721A2/de
Publication of EP0289721A3 publication Critical patent/EP0289721A3/de
Application granted granted Critical
Publication of EP0289721B1 publication Critical patent/EP0289721B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28C7/00—Controlling the operation of apparatus for producing mixtures of clay or cement with other substances; Supplying or proportioning the ingredients for mixing clay or cement with other substances; Discharging the mixture
    • B28C7/04—Supplying or proportioning the ingredients
    • B28C7/06—Supplying the solid ingredients, e.g. by means of endless conveyors or jigging conveyors
    • B28C7/062—Supplying the solid ingredients, e.g. by means of endless conveyors or jigging conveyors with a pneumatic or hydraulic conveyor

Definitions

  • the invention relates to a method and a device for the continuous dosing of powdery substances, in particular of powdery synthetic silica by means of pressurized gas.
  • the synthetic silica is fed directly to the spray nozzle via a third feed line.
  • the object of the invention is to precisely meter the addition of synthetic silica to pointed concrete and to mix it homogeneously with the shotcrete.
  • the invention relates to a process for the continuous metering of powdery substances, in particular synthetic silica, by means of pressurized gas, preferably by means of pressurized air, which is characterized in that the pressurized gas supply in a branch pipe is alternately interrupted in a pressurized gas pipe which is guided at least twice Pouring powdered substance into the branch line and then conveying the powdered substance further by means of the pressurized gas.
  • the line carrying the pressurized gas can be routed four times in branch lines.
  • the branch line can be closed off by a check cap.
  • the resulting excess pressure can be shut off via a butterfly valve and another line, e.g. into the silo that contains the powdered material.
  • the powdery substance can be conveyed from the silo into the branch line by means of known means, for example a pump.
  • the branch lines can be shut off by means of known butterfly valves.
  • Another object of the invention is a device for the continuous dosing of powdery substances, in particular synthetic silica, by means of pressurized gas, which is characterized in that a multiple, at least two-fold line, which is brought together again after the branching, in each of the branch lines
  • the direction of flow of the pressurized gas is provided with a shut-off valve and a non-return valve, the branch lines being connected via a shut-off valve to a storage silo for the pulverulent material and to a ventilation pipe.
  • the process according to the invention has the advantage that the pulverulent substance is mixed homogeneously with the concrete without loss of substance.
  • the concrete is transported from the ready-mixed concrete plant 1 to the concrete pump 3 by means of the mixing vehicle 2.
  • the concrete pump 3 conveys the concrete via the valve 4 to the spray nozzle 5. From there, concrete is applied to the wall 6.
  • the synthetic silica is conveyed from the silo 7 by means of the vehicle 8 or alternatively via the dedicated line 9 into the storage container 10 and from there into the feed device 11.
  • Compressed air is fed from the compressor into the feed device 11 via the line 12.
  • the synthetic silica is conveyed from the feed device 11 via the valve 13 into the spray nozzle 5 and mixed with the concrete in the spray nozzle 5.
  • the synthetic silica is pumped from the storage container 10 into the pipes 15 and 16 by means of the pump 14.
  • the pipes 15 and 16 are provided with the butterfly valves 17 and 18.
  • the pipelines 15 and 16 are connected to the branch lines 19 and 20 via the butterfly valves 17 and 18.
  • the branch lines 19 and 20 are connected to the hose line 23 via the butterfly valves 21 and 22.
  • branch lines 19 and 20 are connected to the hose line 26 via the check valves 24 and 25.
  • the hose line 23 is connected to the compressor and introduces the compressed air into the feed device.
  • the hose line 26 is connected to the valve 13 and, via the valve 13, leads the mixture of synthetic silica and compressed air into the spray nozzle 5.
  • branch lines 19 and 20 are provided with the butterfly valves 27 and 28.
  • the butterfly valves 27 and 28 are connected to the lines 29 and 30, which are continued together in the line 31 and are connected to the reservoir 10.
  • the synthetic silica is fed alternately into the compressed air stream via the shut-off valves 17 and 18 into the branch lines 19 and 20.
  • the overpressure when filling the pipeline 19 is compensated via the lines 30 and 31 in the reservoir 10.
  • the compressed air flow is simultaneously passed via the opened shut-off valve 21 and the open non-return valve 24 into the hose line 26 through the branch line 20 to the branch line 19.
  • the butterfly valves 18 and 27 are closed.
  • the flap 22 is opened and the compressed air flow conveys the synthetic silica from the branch line 19 via the open non-return flap 25 into the hose line 26.
  • branch line 20 is filled with synthetic silica via the opened butterfly valve 18.
  • the speed-determining step is to fill the branch lines 19 or 20 with synthetic silica.
  • the synthetic silica is pumped from the storage container 10 into the pipes 32, 33, 34 and 35 by means of the pump 14.
  • the synthetic silica is supplied to the branch lines 36, 37, 38 and 39 via the shut-off valves 40, 41, 42 and 43.
  • the compressed air is supplied to the branch lines 36, 37, 38 and 39 via the shut-off valves 44, 45, 46 and 47.
  • the compressed air is supplied from the compressor via line 57.
  • the branch lines 36, 37, 38 and 39 are shut off during the filling with synthetic silica by means of the non-return flaps 58, 59, 60 and 61.
  • the mixture of compressed air and synthetic silica is led out of the feed device via line 62.
  • the device according to FIG. 3 has four, instead of two, branch lines which can be filled with synthetic silica.
  • the device according to FIG. 3 enables the compressed air to be charged more quickly with synthetic silica.
  • the device according to FIG. 3 is operated in 4-stroke operation.
  • the synthetic silica can be used in the process according to the invention, which are described in Winnacker-Riechler, Chemical Technology, Volume 3, Inorganic Technology II, 4th Edition, Carl Hauser Verlag Kunststoff, Vienna 1983, pages 75 to 90.
  • the precipitated silicas can be used unmilled or steam jet milled or spray dried or spray dried and milled.
  • the following precipitated silicas can be used, with the precipitated silica FK 320 DS being given the delay.
  • the pH value is determined electrometrically with a glass electrode and a pH meter.
  • the pH value of silicas is generally in the neutral range, that of silicates in the weakly alkaline range.
  • the sieve residue is a key figure for the fine particle size.
  • the sieve residue is determined according to the Mocker in order to record the fractions of non-dispersible or difficult-to-disperse fractions found in precipitated silicas and silicates.
  • a silica suspension is rinsed through the sieve at 4 bar water pressure.
  • the sieve is then dried and the sieve residue is weighed out. 45 micrometer sieves are used, which correspond to 325 mesh (according to ASTM).
  • the surface of silicas and silicates is measured in m2 / g using the BET method.
  • the process is based on the adsorption of gaseous nitrogen at the temperature of the liquid nitrogen.
  • the Haul and Dümbgen Areameter method can be used to advantage. Calibration is required. Both the “inner” and the “outer” surface are detected.
  • the average size of the primary particles can be determined using electron microscopic images. For this purpose, the diameters of approx. 3,000 - 5,000 particles are determined, the arithmetic mean of which is calculated.
  • the individual primary particles are generally not isolated, but are combined to form aggregates and agglomerates.
  • the "agglomerate" particle size of precipitated silicas and silicates depends on the grinding process.
  • the precipitation products contain a small proportion of physically bound water. After drying in a drying cabinet at 105 ° C. for 2 hours, most of the physically bound water has been removed.
  • the precipitated silica FK 320 DS is a precipitated silica which was steam-jet milled after the rotary kiln drying.
  • the precipitated silica Durosil is an unmilled rotary kiln-dried precipitated silica.
  • Precipitated silica Sipernat 22 is a spray-dried precipitated silica.
  • Precipitated silica Sipernat 22 S is a spray-dried and ground precipitated silica.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Air Transport Of Granular Materials (AREA)
  • Silicon Compounds (AREA)
  • On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
  • Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)
  • Lining And Supports For Tunnels (AREA)
EP88102609A 1987-04-30 1988-02-23 Verfahren und Vorrichtung zum kontinuierlichen Dosieren von pulverförmigen Stoffen mittels Pressgas Expired - Lifetime EP0289721B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88102609T ATE71573T1 (de) 1987-04-30 1988-02-23 Verfahren und vorrichtung zum kontinuierlichen dosieren von pulverfoermigen stoffen mittels pressgas.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19873714387 DE3714387A1 (de) 1987-04-30 1987-04-30 Verfahren und vorrichtung zum kontinuierlichen dosieren von pulverfoermigen stoffen mittels pressgas
DE3714387 1987-04-30

Publications (3)

Publication Number Publication Date
EP0289721A2 EP0289721A2 (de) 1988-11-09
EP0289721A3 EP0289721A3 (en) 1990-10-31
EP0289721B1 true EP0289721B1 (de) 1992-01-15

Family

ID=6326565

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88102609A Expired - Lifetime EP0289721B1 (de) 1987-04-30 1988-02-23 Verfahren und Vorrichtung zum kontinuierlichen Dosieren von pulverförmigen Stoffen mittels Pressgas

Country Status (7)

Country Link
US (1) US4815860A (enrdf_load_stackoverflow)
EP (1) EP0289721B1 (enrdf_load_stackoverflow)
JP (1) JPS63287541A (enrdf_load_stackoverflow)
AT (1) ATE71573T1 (enrdf_load_stackoverflow)
DE (2) DE3714387A1 (enrdf_load_stackoverflow)
ES (1) ES2027714T3 (enrdf_load_stackoverflow)
IN (1) IN169895B (enrdf_load_stackoverflow)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NO162848C (no) * 1987-09-11 1990-02-28 Elkem As Fremgangsmaate for tilsetning av silica stoev til en toerr sproeyte-betongblanding.
JPH07103691B2 (ja) * 1990-06-20 1995-11-08 東亞合成株式会社 急結性吹付材の吹付工法
DE4232112A1 (de) * 1992-09-25 1994-03-31 Celcommerz High Chem Produkte Verfahren und Vorrichtung zum Zugeben von Füll- und Verstärkungsstoffen zu hochviskosem Material
DE4329568C2 (de) * 1993-09-02 1997-04-17 Kraus Hans Bernd Vorrichtung zur Förderung eines trockenen, streufähigen Baustoffes und Verfahren zur Anwendung dieser Vorrichtung im Lehmbau
DE4414233A1 (de) * 1994-04-23 1995-10-26 Wuerschum Gmbh Vorrichtung zum Zumessen von pulver- oder granulatförmigem Wägegut
NO962925L (no) * 1996-03-29 1997-09-30 Olav Geir Tjugum Akselerator for spröytebetong, og fremgangsmåte og utstyr for tilsetning til spröytebetong
US6123484A (en) * 1997-01-29 2000-09-26 Fujita; Takatoyo Soil pile and method for constructing the same
DE10023170B4 (de) * 2000-05-11 2006-04-27 Kurt Wolf VELCO Gesellschaft für Förder-, Spritz- und Silo-Anlagen mbH Vorrichtung zur Befeuchtung von trockenen Spritzmassen in der Förderleitung
DE10308722A1 (de) * 2003-02-28 2004-09-09 Degussa Ag Homogenisierung von nanoskaligen Pulvern
DE102005006601A1 (de) * 2005-02-11 2006-08-24 Harro Höfliger Verpackungsmaschinen GmbH Verfahren und Vorrichtung zum Transportieren von pulverförmigem Füllgut durch eine Leitung
US7938571B1 (en) 2005-10-11 2011-05-10 Flyashdirect, Ltd. Fly ash treatment system and method of use thereof
US7942566B1 (en) * 2005-10-11 2011-05-17 Flyashdirect, Ltd. Fly ash treatment system and method of use thereof
CA2928869C (en) * 2013-11-07 2022-06-28 Air Krete, Inc. A progressive bubble generating system used in making cementitious foam
NZ720942A (en) * 2014-01-24 2018-02-23 Hoffmann La Roche Method of manufacturing uni- and no-code test strips
CN104213927B (zh) * 2014-08-26 2016-05-04 班珊珊 速凝剂粉气发生器

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1684370A (en) * 1928-09-11 Art of transporting mixed materials
US3625724A (en) * 1968-09-23 1971-12-07 Altrona Corp Cellular concrete and method for producing the same
DE2130257C3 (de) * 1970-06-18 1975-04-03 Challenge-Cook Bros. Inc., Industry, Calif. (V.St.A.) Verfahren zum Spritzen von Beton od.dgl. sowie Vorrichtung zur Durchführung des Verfahrens
US3779519A (en) * 1971-06-07 1973-12-18 Tetradyne Corp Concrete placement
DE7131296U (de) * 1971-08-16 1971-12-09 Wibau Gmbh Vorrichtung zur anteiligen zuteilung von pulverfoermigen erstarrungsbeschleunigern zu stroemendem zementbeton
US3840186A (en) * 1972-10-24 1974-10-08 J Broadfoot Unit for feeding difficult to feed materials
US4292351A (en) * 1978-04-28 1981-09-29 Yasuro Ito Method of blasting concrete
JPS593368B2 (ja) * 1978-10-02 1984-01-24 極東開発工業株式会社 粉粒体の定重、定容量供給装置
US4234272A (en) * 1978-10-06 1980-11-18 Laseter Douglas E Material conveyor
US4298288A (en) * 1980-01-25 1981-11-03 Anthony Industries, Inc. Mobile concreting apparatus and method
JPS56124465A (en) * 1980-03-05 1981-09-30 Gijutsu Shigen Kaihatsu Kk Method and apparatus for spraying cement mortar, etc.
JPS6026506A (ja) * 1983-07-25 1985-02-09 Kawasaki Heavy Ind Ltd 粉体分配装置
JPS6040570U (ja) * 1983-08-22 1985-03-22 芦沢　七郎 密閉式水道貯水槽
DE3703761A1 (de) * 1987-02-07 1988-08-25 Hochtief Ag Hoch Tiefbauten Vorrichtung zum auftragen einer spritzbetonschicht

Also Published As

Publication number Publication date
EP0289721A2 (de) 1988-11-09
ATE71573T1 (de) 1992-02-15
DE3867693D1 (de) 1992-02-27
ES2027714T3 (es) 1992-06-16
JPH0448493B2 (enrdf_load_stackoverflow) 1992-08-06
EP0289721A3 (en) 1990-10-31
IN169895B (enrdf_load_stackoverflow) 1992-01-04
DE3714387A1 (de) 1988-11-10
US4815860A (en) 1989-03-28
JPS63287541A (ja) 1988-11-24

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