Classifications

• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10C—WORKING-UP PITCH, ASPHALT, BITUMEN, TAR; PYROLIGNEOUS ACID
  • C10C3/00—Working-up pitch, asphalt, bitumen
  • C10C3/14—Solidifying, Disintegrating, e.g. granulating
  • C10C3/16—Solidifying, Disintegrating, e.g. granulating by direct contact with liquids

Definitions

• bituminous mass In order to produce asphalt for floor and road surfaces, so far the bituminous mass was mixed while hot with the relevant mineral fillers. Since in this case the liquid bitumen completely encloses the filler and essentially fills the voids between the filler particles, the proportion of bitumen in the asphalt screed or road surface is relatively high. This in turn requires a relatively low pressure resistance. Another disadvantage is the unpleasant working conditions when applying asphalt or bitumen on roads, floors and roofs, since in all cases, a hot, smelly mass must be processed to escape from the harmful vapors.
• the invention has for its object to provide a method of the type mentioned, which facilitates the processing of bitumen and asphalt and allows the production of mixtures with a particularly low bitumen content.
• the above object is achieved in that the optionally premixed with a carrier bitumen quenched in the flowable state by means of cryogenic liquid and thereby granulated and / or pulverized, and that thereafter in the granulated and / or pulverized state with at least one Filler is mixed or placed on the surface for application.
• the advantage of the new method is first that mix the granulated and / or pulverized bitumen in the cooled state easily and under pleasant working conditions with fillers and can be applied to the surfaces to be coated.
• very homogeneous mixtures can be produced. It can be particularly advantageous in an individual case that can be produced by mixing the filler with granular rather than liquid bitumen extremely lean and correspondingly hard mixtures.
• the bitumen particles need fill the voids between the filler particles only to a small extent. During "thawing" or heating, the re-liquefied bitumen retracts into the gaps as a result of capillary action and to the contact points of the filler particles.
• bitumen is first mixed in the liquid state with a designated here as a carrier first filler whose particles are completely surrounded by bitumen.
• a carrier first filler whose particles are completely surrounded by bitumen.
• resulting solid grains consisting of a core formed by the carrier and formed by the bitumen, now hard surface layer.
• Their volume is smaller than if the whole grain were made of frozen bitumen, but can also serve as a binder between the adjacent filler particles after mixing with fillers.
• bitumen-coated carrier particles is sufficient, which are mixed very evenly with the intended filling material in the cooled state.
• the bituminous surface layer is thawed or heated on the carrier particles, again partially retracts further into narrow gaps between adjacent filler particles and bilt small, strong bridges between the filler particles with each other, as well as between these and the carrier.
• bitumen is used in the granulated or powdered state, it should also be understood as meaning that bitumen containing a carrier.
• the heated, liquid bitumen which may optionally be mixed with oil or a solvent for liquefaction, can be readily deterred and granulated by crushing it in a simple manner by pouring it into a liquid gas bath.
• the quenching of the hot, liquid bitumen causes it to be granulated more or less fine-grained, without the need for a special crushing process.
• the sprinkled, granulated bitumen can be further refined by painting.
• bitumen particles can also be achieved in a modified embodiment of the invention in that the hot, liquid bitumen atomized by at least one jet nozzle or by a blast wheel to drip and these are quenched by liquid gas.
• the hot, liquid bitumen atomized by at least one jet nozzle or by a blast wheel to drip and these are quenched by liquid gas you can drop the drops formed by sputtering in the liquefied petroleum gas or bring into contact with also atomized liquefied gas.
• indirect cooling is possible by the bitumen is atomized in a cooling chamber whose walls and / or gaseous atmosphere are kept low temperature by LPG. For cost reasons, it makes sense, liquid nitrogen as to use cryogenic liquid gas.
• the further processing of the granular or powdery bitumen depends on the respective application purposes.
• the material can be z. B. in refrigerated containers to construction sites, there mix with fillers and aggregates in a very even distribution and spread, for example, on a floor as screed. It is immediately apparent that the handling of the granular material is much more pleasant than with hot, liquid bitumen or asphalt.
• the granular bitumen can already be mixed in the factory with fillers and aggregates and the mixture is transported to the construction sites. Which method is used in a particular case also depends on the bitumen used. Higher-boiling bitumen can be kept longer at ambient temperatures than powder and applied in powdery form together with fillers and additives to a surface to be coated. On the other hand, it may then recommend, by brief heating with z. For example, a hot plate or roller or by microwave irradiation to bring the bitumen faster or at all until that temperature at which the intended binding of the fillers occurs.
• bitumen in practice in many cases without such subsequent heating of the applied powdered or granular mixture on a surface, since the bitumen can be selected and adjusted so that it is sufficiently sticky on the one hand at ambient temperature and becomes flowable in order to bond the filler particles together, on the other hand with which increasing wetting and distribution in the columns of the material and by the absorption of dust is also increasingly solidified.
• the contact between bitumen and filler can be facilitated in difficult cases by the latter is moistened with alcohol or other wetting agent before mixing with the granular or powdery bitumen.
• Another application method which is preferred for practical use provides that the cooled, granular or pulverulent bitumen, with or without fillers, is applied to a surface to be coated by means of a spray gun, wherein the spray gun has a heating device or is operated with hot air, so that the Bitumen is heated only briefly and immediately during application to a sufficient extent to develop the intended binding effect.
• the new method is also suitable for solidifying ballast beds z. B. in track and road construction.
• the ballast stones are glued by the bitumen mixed in the granular state with the ballast, while the internal cavities and the water permeability of the ballast remain virtually unchanged.
• the interconnected, relatively large cavities in a ballast bed even offer the possibility that the powdery or granular bitumen is subsequently introduced into an existing gravel bed and then after heating to ambient temperature or by additional heating z. B. by means of hot air or microwave, is liquefied and glued the ballast stones together.

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• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Civil Engineering (AREA)
• General Chemical & Material Sciences (AREA)
• Structural Engineering (AREA)
• Materials Engineering (AREA)
• Oil, Petroleum & Natural Gas (AREA)
• Organic Chemistry (AREA)
• Compositions Of Macromolecular Compounds (AREA)

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Citations (5)

• 1989
  • 1989-10-23 EP EP89119605A patent/EP0424550A1/fr not_active Withdrawn

Patent Citations (5)

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