EP2081877A2 - Procédé de production de matière apte au déversement - Google Patents

Procédé de production de matière apte au déversement

Info

Publication number
EP2081877A2
EP2081877A2 EP07804621A EP07804621A EP2081877A2 EP 2081877 A2 EP2081877 A2 EP 2081877A2 EP 07804621 A EP07804621 A EP 07804621A EP 07804621 A EP07804621 A EP 07804621A EP 2081877 A2 EP2081877 A2 EP 2081877A2
Authority
EP
European Patent Office
Prior art keywords
bulk material
heating stage
particles
pipe
subsequent heating
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Withdrawn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
EP07804621A
Other languages
German (de)
English (en)
Inventor
Weihua Liu
Horst Wustinger
Heinz Dullinger
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP2081877A2 publication Critical patent/EP2081877A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
    • C04B20/02—Treatment
    • C04B20/04—Heat treatment
    • C04B20/06—Expanding clay, perlite, vermiculite or like granular materials
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B19/00—Combinations of different kinds of furnaces that are not all covered by any single one of main groups F27B1/00 - F27B17/00
    • F27B19/04—Combinations of different kinds of furnaces that are not all covered by any single one of main groups F27B1/00 - F27B17/00 arranged for associated working

Definitions

  • the invention relates to a process for the production of bulk material from porous grains by foaming of particles of a bulk material by heat.
  • the individual particles of the starting bulk material consist of a material which becomes viscous at elevated temperature and in which a component which becomes gaseous at elevated temperature is enclosed, attached or contained.
  • bulk material in this sense an accumulation of solid, non-interconnected particles or grains, the individual particles or grains being small in relation to the total amount Bulk goods with “particles”, the foamed items of a bulk material, however, with “grains”.
  • a very important application is the production of a bulk material with low density and high heat insulation capacity by foaming a bulk material of a mineral material such as perlite or Pechstein.
  • a bulk material of a mineral material such as perlite or Pechstein.
  • These have a high proportion of network-forming (“glass-forming") material - in the examples mentioned SiO 2 - and a significant amount of trapped water of crystallization, which evaporates when heated and thus in this example represents the "gaseous at elevated temperature component".
  • EP 0 431 112 B1 it is known from EP 0 431 112 B1 to supply the raw material in the form of particles in a specific size range. This reduces those problems that result from the fact that in the same hot environment, smaller particles heat up much faster than larger particles.
  • the object underlying the invention is to improve the process of foaming over the achievable with the aforementioned methods measure extent to the effect that thus a much more homogeneous bulk material is obtained from similar foamed grains.
  • Fig. 1 shows an exemplary flowchart for a concrete embodiment of the method according to the invention.
  • the raw material delivered into the chute 1 for processing is a bulk material of 0.4 to 0.6 mm particle size of Pechstein. Chemically it consists of about 72% SiO 2, as well as about 12% Al 2 Cb; the rest is water and impurities.
  • any existing particles larger than 0.6 mm or smaller than 0.4 mm are sorted out.
  • the too large particles would foam too little, the too small particles would foam too quickly and too much and subsequently lead to sticking with other grains, or with plant parts, or break after solidification and form dust.
  • the bulk material passes into the rotary kiln 4.
  • Its furnace interior has the shape of a circular cylinder with a length of about seven meters, a diameter of 480 mm, and an axis inclined from the input side to the output side by about five degrees.
  • the outer surface of the furnace interior - essentially a tube made of steel - rotates at about 40 revolutions per minute about its longitudinal axis.
  • the rotary kiln is electrically heated in several successive temperature-controlled heating zones. In the first part of the tube, the temperature is 220 to 320 0 C, in the second part of 280 to 360 0 C. In the first part of the furnace, especially the water accumulating on the surface of the particles is evaporated.
  • Both the sieve 5, as well as the subsequent parts of the promotion of the foamed bulk material should be operated largely isolated from the ambient air, so that the heated in the rotary kiln 4 bulk material neither cools unnecessarily nor performs an uncontrolled moisture exchange with the ambient air.
  • the bulk material to be foamed is conveyed via a bucket conveyor 6 to the filling opening 7 of the shaft furnace 8 located at the upper end, the interior of which has the shape of a slim, standing circular cylinder.
  • the filling opening 7 is formed as a cone distributor. That is, the upper end of the shaft furnace is completed on the one hand by an axially arranged downwardly widening, conical or frustoconical part, on the other hand by a part which on the one hand surrounds this first part on its lateral surface at a distance thereto, on the other hand on the inner surface of the Furnace interior is applied.
  • the bulk material trickles down in the gap forming a truncated cone lateral surface between these two parts. It thus arrives at the upper end, close to the lateral surface, into the furnace interior of the shaft furnace 8.
  • the trickling of the bulk material through the filling opening 7 can be set very uniformly by adjusting the gap with a thickness which is only slightly greater than the size of the particles to be carried out, and by applying a vibration to the frusto-conical part of the cone distributor.
  • a vibration to the frusto-conical part of the cone distributor.
  • the use of such a cone distributor is also useful for foaming, if foaming is carried out according to previously known methods, without sieving immediately before the last heating operation.
  • the shaft furnace 8 has a height of 7.3 meters and an inner diameter of 30 cm. It is electrically heated over its height in seven individual temperature-controlled heating zones. With decreasing height the temperature rises from 800 0 C to 1100 ° C.
  • the foaming particles of the above introduced bulk material fall down in the shaft furnace. They are heated in the temperature range in which their state is doughy, and froth them as a result of the evaporation of remaining residual water of crystallization. Near the lower end of the shaft furnace 8 should have a closable opening for sampling may be appropriate. Down arriving, formed by foaming from particles, still doughy frothy grains can be removed there with an inserted spoon-like device and their foaming degree in a subsequent, be assessed visually and by weight and volume measurement. If the extracted grains are too light, ie foamed too much, then either the temperature is reduced, or the amount of bulk material introduced increases per time. If the extracted grains are too heavy, the temperature must be increased or the amount of bulk material introduced per unit of time must be reduced.
  • the lateral surface of the shaft furnace 8 ends in a downwardly narrowing, externally water-cooled truncated cone lateral surface 9. Impacted, foamed grains are first cooled on this surface. The temperature of this surface should be as cool as possible, at least below the glazing temperature of the material of the bulk material.
  • this surface passes into a tubular removal line 11, which at its other end opens into a pipeline 12 serving for the transport and further cooling of the foamed grains.
  • the junction of the line 11 in the pipe 12 should be formed at an acute angle to the transport direction in the pipe 12.
  • the pipe 12 fresh air flows, which is blown at one end by a blower 10 via an injector.
  • This injector tube is coaxial with the pipe 12, its outer diameter is smaller than the inner diameter of the pipe 12 and its end should protrude beyond the junction of the extraction line 11. This ensures that air flows from the open space of the shaft furnace 8 into the pipe 11 and not vice versa.
  • the injector in its longitudinal direction, ie in the local direction of the conduit 12 is displaceable, so that its position with respect to the junction point of the extraction line 11 can be finely adjusted. It has been shown that the optimal position depends among other things on the air pressure and possibly also on the temperature of the ambient air, and thus should be adjusted from time to time.
  • This embodiment of the removal point from the shaft furnace is of course also advantageous if foaming is carried out in accordance with previously known methods, without sieving immediately before the last heating process.
  • the reaching into the pipe 12 foamed bulk material is further cooled there and solidifies.
  • the flow rate in the pipeline 12 should be sufficiently high so that there is no deposition.
  • the pipe 12 may also have a few bends; Thus, a sticking of individual grains against a straight and thus more laminar flow is better avoided.
  • a tube diameter of 20 cm a flow rate of 17 m / sec and a length of about 10 m, very good results are achieved.
  • the foamed bulk material is thrown into - ideally funnel-shaped - collecting containers 14 with sacks 15 connected beneath it.
  • the air flowing out of the pipe 12 is discharged. It is very advantageous to arrange a plurality of collecting containers 14 adjacent to one another in the flow direction of the outflowing air. Since specifically lighter grains are better carried by the flowing air than specific heavier grains whose movement is determined more by their mass, this results in a weight sorting of the foamed grains.
  • a kind of trap 13 can be formed for poorly or not at all foamed grains. Due to their density, these grains are moved closer to the lower cross-sectional area of the pipeline 12, and can be sorted out well by a lower jacket opening and an adjoining insert part projecting from below into the pipeline 12.
  • the operating parameters described relate to a bulk of Pechstein. They are at least approximately true for the foaming of many silicate-rich minerals of volcanic origin with a high proportion of glazing and trapped water of crystallization. With appropriate adjustment of the operating parameters such as amount per time, temperatures and speeds, the method described for the foaming of a wealth of other materials can be modified.
  • the medium that becomes gaseous under the action of heat does not necessarily need to be water. It can also act as blowing agents other substances, such as For example, be provided at normal temperature bound CO 2 or titanium hydride.
  • the foamed material does not necessarily have to be a mineral material. It can also be, for example, a metal in which propellant particles have been incorporated in an earlier step. It may also be an organic material, which is foamed by means of the described method into flakes or beads.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Processing Of Solid Wastes (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)

Abstract

La présente invention concerne un procédé de production de matière apte au déversement, par expansion d'une matière apte au déversement par application de chaleur. Les particules individuelles de la matière apte au déversement sont faites d'une matière qui devient visqueuse à température élevée et renferme une substance qui se gazéifie à température élevée telle que de l'eau de cristallisation ou un agent gonflant. Au cours d'une étape de chauffage antérieure, la matière apte au déversement est chauffée à une température à laquelle cette dernière est encore solide, mais à laquelle a déjà lieu une gazéification de la substance qui se gazéifie à température élevée. Au cours d'une étape de chauffage ultérieure, la température de la matière apte au déversement est élevée jusqu'à ce que les particules individuelles deviennent visqueuses. Entre les deux étapes de chauffage a lieu un tamisage de la matière apte au déversement, grâce auquel les particules dont la taille dépasse une valeur seuil inférieure prédéterminée, sont exclues de l'étape de chauffage ultérieure.
EP07804621A 2006-07-19 2007-07-18 Procédé de production de matière apte au déversement Withdrawn EP2081877A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT0122606A AT504051B1 (de) 2006-07-19 2006-07-19 Verfahren zur herstellung von schüttgut
PCT/IB2007/002026 WO2008010074A2 (fr) 2006-07-19 2007-07-18 Procédé de production de matière apte au déversement

Publications (1)

Publication Number Publication Date
EP2081877A2 true EP2081877A2 (fr) 2009-07-29

Family

ID=38658223

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07804621A Withdrawn EP2081877A2 (fr) 2006-07-19 2007-07-18 Procédé de production de matière apte au déversement

Country Status (3)

Country Link
EP (1) EP2081877A2 (fr)
AT (1) AT504051B1 (fr)
WO (1) WO2008010074A2 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT510508B1 (de) 2010-09-30 2013-06-15 Horst Wustinger Werkstoff, welcher geblähtes vulkanglas enthält
AT511618B1 (de) 2011-07-13 2013-12-15 Horst Wustinger Schachtofen für das hitzebedingte aufschäumen von partikeln eines schüttgutes
AT12878U1 (de) 2011-10-10 2013-01-15 Binder Co Ag Verfahren zum geschlossenzelligen blähen von mineralischen material
AT512112A1 (de) 2011-10-20 2013-05-15 Horst Wustinger Keramikmasse
WO2013071324A2 (fr) * 2011-11-17 2013-05-23 Horst Wustinger Procédé de fabrication de grains poreux en verre soluble
AT513933A1 (de) 2013-02-12 2014-08-15 Horst Wustinger Verfahren für das Verbinden von Körnern aus geblähtem Vulkanglas
AT515368B1 (de) 2014-02-03 2016-06-15 Geolyth Mineral Tech Gmbh Mineralische Formulierung
EP3795548A1 (fr) * 2019-09-23 2021-03-24 Binder + Co AG Granulat expansé de matière minérale

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3010911A (en) * 1958-08-29 1961-11-28 Zonolite Company Method of and apparatus for heat processing particulate solids
GB1103852A (en) * 1964-02-11 1968-02-21 Osaka Cement Company Ltd Methods and apparatus for manufacturing high-strength, light-weight aggregates for light-weight concretes
DE1207258B (de) * 1964-09-17 1965-12-16 Johannes Tacken Verfahren zur Herstellung von poroesen, keramischen Stoffen aus Blaehtonen
DE1771384B2 (de) * 1968-05-16 1976-03-04 Bühler-Miag GmbH, 3300 Braunschweig Verfahren zum herstellen von blaehton
SE354267C (sv) * 1972-05-15 1981-05-18 Rudolf Eliasson Sett att framstella kulor av expanderad lera
US3854972A (en) * 1973-05-07 1974-12-17 M Kratochvil Light-weight aggregates
HU205592B (en) * 1985-05-08 1992-05-28 Janos Hornyos Process for producing granulated material with incorporated gas celles
DE3908172A1 (de) * 1989-03-13 1990-09-20 Andreas Dipl Ing Gumbmann Poroeses mineralisches leichtzuschlagstoffgranulat sowie verfahren zu seiner herstellung
IE910858A1 (en) * 1990-03-15 1991-09-25 Literock Internat Proprietary Aggregate for use in making structural elements
JP3211113B2 (ja) * 1993-02-24 2001-09-25 日立造船株式会社 脱水汚泥を原料とする軽量骨材の製造方法
DE4445654A1 (de) * 1994-12-21 1996-06-27 Sandoz Ag Verfahren und Vorrichtung für die thermische Behandlung von mineralischem Granulat
JP2002249349A (ja) * 2001-02-19 2002-09-06 Taiheiyo Cement Corp 人工軽量骨材の製造方法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2008010074A3 *

Also Published As

Publication number Publication date
WO2008010074A2 (fr) 2008-01-24
AT504051B1 (de) 2009-01-15
WO2008010074A3 (fr) 2008-05-02
AT504051A1 (de) 2008-02-15

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