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
  • C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators or shrinkage compensating agents
  • C04B22/002—Water
  • C04B22/0053—Water added in a particular physical form, e.g. atomised or in the gas phase
• • 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
  • B01J2/06—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 liquid medium
• • 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
  • B01J2/12—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic in rotating drums
• • 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
  • C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
  • C04B40/06—Inhibiting the setting, e.g. mortars of the deferred action type containing water in breakable containers ; Inhibiting the action of active ingredients
  • C04B40/0683—Inhibiting the setting, e.g. mortars of the deferred action type containing water in breakable containers ; Inhibiting the action of active ingredients inhibiting by freezing or cooling

Definitions

• the invention relates to a method according to the preamble of the main claim and an arrangement for performing the method and the use of the ice particles produced.
• incoherent small and smallest ice particles are obtained in the form of water dripped in droplets, which have a granular, pourable structure and do not stick together. They are also colder than -100 * C when using liquid nitrogen as the liquid gas. These ice particles with a diameter of less than 1 cm, preferably less than 1 mm, can be further processed as pourable material.
• the ice particles can advantageously be produced by spraying water droplets into the liquid gas by means of a finely atomizing water spray. After that, the frozen ice particles only have to be removed using a sieve of appropriate mesh size.
• an arrangement is provided according to the invention, which is characterized by a container for holding the liquid gas, means provided in the container for atomizing water and introducing the atomized water into the liquid gas, by means for supplying the liquid gas and the water into the container and by means for bringing the frozen water particles out of the liquid gas.
• FIG. 2a a cross section through the screw conveyor with housing
• Fig. 3 another embodiment of the invention in longitudinal section.
• a container in the form of a preferably heat-insulated drum 1, which can be rotated about its horizontally running longitudinal axis A-A.
• Liquid nitrogen and line 4 water can be introduced into the drum 1 with the line 3.
• the water introduction ends in spray nozzles 5, which are distributed over the length L of the interior of the drum 1 in such a way that the bath 6 located in the lower region of the drum is made of liquid gas, preferably liquid nitrogen, by means of the nozzles 5 from above with finely sprayed Water 2 can be applied.
• the surface of the gas bath 6 is numbered 7.
• a screw conveyor 8 is provided, which supplies the material of the ice particles formed in the bath 6 to it by scoops 14 leads to the outside in the direction of arrow 10, so that it reaches the schematically indicated container 12 via a slide 11.
• the container 12 can be the mixing container of a concrete mixing vehicle or a container containing the additives.
• the above-mentioned eccentricity is preferably selected such that the longitudinal axis of the screw conveyor 8 is located at a corresponding distance above the longitudinal central axis AA of the drum 1.
• the small water particles 2 generated by the spray nozzles 5 are frozen in the bath 6 to form a correspondingly small ice particle.
• the scooping bowls 14 rotating in the direction of the arrow 13 are provided. For reasons of structural simplicity, these shells 14 are firmly connected to the drum 1 and circulate with it. In the present exemplary embodiment, two scooping bowls 14 are provided, which are offset by 180 degrees in the direction of rotation 13. When passing through the bath 6, these scoops grab the ice particles formed therein, scoop them out of the liquid bath 6 and place them in the screw conveyor 8.
• the housing 15 of the screw conveyor is open in its upper region for unloading the ice particles from the scoops 14 (FIG. 2a); while the lower region of the housing 15 is closed and prevents the ice particles from falling back into the bath 6.
• the scoops 14 can have very small slits or openings in their diameter or width which allow the bath liquid 6 to pass through, but not the ice particles formed therein. This prevents the scoops 14 from still carrying liquid gas when they leave the bath 6.
• a supply 16 of gaseous nitrogen or the like to the water line 4 is provided in order to prevent the ice from being interrupted or terminated. manufacture freeze the nozzles 5. For this purpose, any remaining water is removed using the gaseous nitrogen.
• An electric motor drive 17 drives the drum 1 and the scoops 14 via a belt drive 18 as well as the screw conveyor 8 via a belt drive 19. Regulation of the speed of the belt drive 18 and the belt drive 19 can be provided (not shown in detail in the drawing).
• the supply of water can be clocked with a solenoid valve 20 in line 4 so that water is only sprayed out of the nozzles 5 when the scoops 14 are not directly in the area of the spray jet 2.
• a further regulation can be provided with regard to the height of the surface level of the bath with the aim of controlling this height and keeping it at a certain value.
• the desired temperature of the cooled concrete mixture to be produced can be achieved relatively precisely by appropriately adjusting the amount of ice particles supplied.
• ice particles that can be produced in continuous operation with the arrangement according to FIGS. 1 to 2a with a maximum diameter of 10 mm and a temperature which is below 100 degrees C, generally about -180 degrees C, can be used according to the exemplary embodiment described below Fig. 3 can also be made with an arrangement that in discontinuous operation, ie batch operation.
• finely atomized water is converted into the ice particles described above in a cryogenic liquefied gas, preferably nitrogen.
• FIG. 3 shows a liquid gas container 21, preferably made of steel, in the interior 22 of which the bath of liquid gas, preferably liquid nitrogen, is located.
• the container 21 is preferably also heat insulated, e.g. with perlite.
• a basket-like ice cream container 23 can be suspended from above in the direction of arrow 24 into the interior 22 of the liquid gas container 21 by means of a cable 25 and pulled out again.
• the wall of the ice container and its base are permeable to the liquid gas, so that when the egg container is inserted, the liquid gas is also located in the interior 26 thereof.
• the liquid level of the liquefied gas is numbered 27.
• the liquid gas preferably nitrogen
• the liquid gas is supplied through a line 34 with a metering valve 35 for regulating the quantity supplied.
• a corresponding metering valve is also present in the embodiment according to FIGS. 1 - 2a.

Landscapes

• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Ceramic Engineering (AREA)
• Organic Chemistry (AREA)
• Materials Engineering (AREA)
• Structural Engineering (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Inorganic Chemistry (AREA)
• Carbon And Carbon Compounds (AREA)
• Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)

Applications Claiming Priority (5)

Publications (1)

Family

ID=26027697

Family Applications (1)

Country Status (5)

Families Citing this family (5)

Family Cites Families (7)

• 1997
  • 1997-07-20 CZ CZ19981763A patent/CZ291660B6/cs not_active IP Right Cessation
  • 1997-07-20 PL PL97327010A patent/PL327010A1/xx unknown
  • 1997-07-20 DE DE19731052A patent/DE19731052A1/de not_active Withdrawn
  • 1997-07-20 EP EP97938836A patent/EP0914583A1/de not_active Withdrawn
  • 1997-07-20 WO PCT/EP1997/003897 patent/WO1998003828A1/de not_active Ceased

Non-Patent Citations (1)

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