JPS6286091A - Production of powdery or granular asphalt - Google Patents

Abstract

PURPOSE:To obtain powdery or granular asphalt which is less susceptible to reagglomeration and is excellent in maintenance of quality with time, by pulverizing a block asphalt having a penetration of 0-20 using a vertical-shaft pulverizer. CONSTITUTION:A block asphalt material having a penetration of 0-20 is pulverized by rotating a rotary blade mounted on a vertical shaft at a high speed. The pulverized material is discharge through a 360 deg.C-entirely opened screen. The reagglomeration of the granulated asphalt can be prevented by mixing or coating the granulated asphalt with a releasable org. compd. or powdery inorg. compd. Examples of the org. compd. include alkyd resin, melamine resin, and wax emulsion. Examples of the inorg. compd. include carbon, zeolite, and talc.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method for pulverizing or granulating solid asphalt raw materials.

"Summary of the Disclosure" Mizuhiki mdo and the drawings are a method for manufacturing powder or granular asphalt by crushing solid asphalt, and by using a crusher with a vertical rotating shaft and rotary blades, the penetration is 1 to 1.
The present invention discloses a technology for producing powdered or granular asphalt that is difficult to reagglomerate and has high quality stability over time by pulverizing No. 20 asphalt.

"Conventional technology" Straight asphalt, blown asphalt, petroleum pitch, deasphalted asphalt, etc. are used in road finishing, asphalt roof inks, building materials, communications, electrical cables, insulation materials, anti-corrosion paints, electrical insulation, waterproofing, filling, and injection. , tangent 71
Material or Fuel 7 Used in a wide range of applications.

These asphalts are either in a molten state or in a solidified form, making them inconvenient to transport, store, and handle. For this reason, several methods have been proposed for pulverizing asphalt into single granules.

Methods for pulverizing or granulating asphalt can be broadly divided into methods for granulating molten asphalt and methods for pulverizing and granulating solid asphalt as it is.

Granulation methods from molten asphalt include the disk method, in which the molten material is made to flow down into a liquid column in a disk that rotates at high speed, and is divided into powders, and the molten material is atomized from a nozzle to form granules. There is a spray method in which a molten material is poured into a cooling tank filled with fluidized water in the form of a liquid column through the pores of a perforated plate, and droplets are formed into granules in water.

Further, as a method for granulating solid asphalt, there is a method using a crusher having both an identification hammer and a free hammer. An example of a crusher will be explained in FIG. 4. In the grinding chamber, swing hammers 8 are attached at intervals between disk hammer plates 7 attached to a main shaft 6 that is wet on the ground, and a lining plate 9 with an involute type recess and a drive plate are installed in 42 parts of the chamber. A screen hole 0 is held in the section. Note that the gap between the hammer head and the lining plate was 1 mm. The raw material 12, which is supplied from the hopper 1 to the 7 pieces in the crushing chamber by the screw feeder 11, is self-crushed by the ultra-high-speed rotation of the hammer and the collision, crushing, impact, and friction caused by the involute-type lining plate, and passes through the screen holes. It becomes ultra-fine powder and is collected in a take-out bag or a receiving tank.

Among the methods mentioned above, the method of granulating from a melt is
Since a means for melting the asphalt raw material and a stage for cooling the asphalt raw material are required, large-scale equipment is necessary, and there are problems such as the efficiency is not very high, so there are few examples of this method being used in practice.

In addition, in the method of granulating solid materials using a crusher, it is possible to granulate them in a cylinder using a compact device, but when using a hammer mill with a rotary shaft type as described above, the solids are pulverized in the crushing chamber. The asphalt is discharged through a screen submerged in the F part of the grinding chamber, and the residence time of the asphalt in the grinding chamber is long, and ripening is likely to occur. In addition, it is easy to generate heat because it self-fractures due to collision, crushing, impact, and J'ff friction caused by the ultra-high-speed rotating hammer and the involute-type lining plate. For this reason, pulverized asphalt tends to re-agglomerate due to heat, adhesion inside the machine, and clogging of the screen T, and only asphalt with a penetration degree of about 0 to 5 can be granulated. In order to crush i-sphards with a penetration depth of 1-1, it is necessary to take a step to prevent heat generation, such as using water or cooling. Collision, crushing,
Shock, maf! ! Because the crushing was done using a shade, it was impossible to granulate relatively large particles. In addition, the shape was flat and angular, making it weak against impact and prone to reagglomeration.

The present invention was developed in view of the problems of the conventional methods as described above, and allows efficient granulation to any desired particle size at room temperature using a compact device, and is less likely to cause reaggregation and bonding even in summer. The present invention provides a method for producing powdered and granular asphalt with high quality stability over time.

[Means and effects for solving the problems] According to the present invention, a method for producing powdery or granular asphalt comprises pulverizing and granulating a lumpy asphalt raw material having a penetration degree of 0 or more and 1-20 or less using a pulverizer. Provided is a method for producing powder or granular asphalt, characterized in that the asphalt raw material is pulverized by high-speed rotation of a rotary blade attached to a vertical rotating shaft, and then discharged from a screen that is fully open at 360 degrees. Furthermore, there is provided a method for producing powdery/granular asphalt, which comprises coating the above powdery or granular asphalt.

The crusher used in the present invention will be explained with reference to the drawings.

FIG. 1 shows an example of a crusher used in the manufacturing method of the present invention. The FiC material supplied from the hopper 1 is pulverized and granulated in the pulverizing chamber 2, and discharged from the screen 3 which is fully open at 360 degrees. FIG. 2 is a sectional view of the crushing chamber 2, and the vertical rotating shaft 4 is equipped with eight rotary blades as shown in FIG. Assuming that the mounting direction is 6 rotations, there will be 2 pieces with the blade facing downwards and 6 pieces facing L from the top.

The raw material supplied from the L hopper is crushed and granulated by the shearing force of the rotating blades 5A and 5B rotating at high speed. At this time, an upward force is applied to the raw material by the lower six rotary blades (5A facing upward), and it is held down to F by the second two blades (5B facing F). The raw material granulated to an appropriate particle size is discharged from the screen 3 to the outside. By changing the pore size of this screen, the particle size can be adjusted and a desired particle size can be obtained. In addition, the screen covers 360 degrees of the sides of the grinding chamber, so the residence time of the raw material in the grinding chamber is very short, and there is little heat generation.

Asphalt raw materials that can be granulated by the method of the present invention include straight asphalt, blown asphalt, petroleum pitch, deasphalted asphalt, mixtures thereof, and mixtures of the asphalt with synthetic resins and synthetic rubber caps. In the method of the present invention, among these asphalt raw materials, the penetration degree is O~20 (JIS K2207
) is preferred. On the other hand, in the case of a water 'f'I' one-rotating shaft type crusher without using the cooling r stage, the penetration degree that can be crushed is 5 or less, which is impossible with the water mole rotary shaft type. A relatively large amount of asphalt can be granulated.

The thus granulated asphalt may be further mixed with or coated with an organic compound or a powdered inorganic compound having peeling properties in order to prevent reagglomeration and bonding.

As for the mixing or coating material, organic compounds include alkyd resins, melamine resins, wax emulsions, and the like. Examples of black powder powder include carbon, zeolite, calcium silicate, talc, calcium bicarbonate, and diatoms. The mixing or coating method is not particularly limited, and various methods can be used as appropriate.

[Example] Examples 1 to 5 and Comparative Examples 1 to 5 Five types of blown asphalt with different penetration degrees, each 5K
After pulverizing g into a lump with a hammer, it was crushed at a rotation speed of 250 O using a vertical rotating shaft type crusher (QM-10, manufactured by Yamato Kako M■).
r, p, m, screen hole diameter 5 mm, room temperature (26°C
) and granulated.

For comparison, the same blown asphalt was pulverized using a water mower rotary shaft type hammer mill.

The results are shown in Table 1.

Table 1 Comparison of Vertical Rotating Axis Rotary Blade Type and Water Moisture Rotating Axis Hammer One Type As is clear from Table 1, the conventional water mower rotating shaft/\hammer one type can only be crushed by cooling or using water. It has been found that asphalt with a penetration depth of 10 or higher, which could not be crushed, can be crushed at room temperature.

In addition, with a single hammer type, it is difficult to form particles with a grain size of 1 mm or more, and since the particles are self-crushed, the shape of the particles is flat and rounded. Therefore, after pulverization, it is easy to reagglomerate and bond. On the other hand, in the 1h11 straight rotation method, the granules are granulated by the shearing force of the rotating blade, so the granules do not become flattened.
It has a shape close to a polyhedron, and tA aggregation is difficult to occur.

The criteria for determining the pulverization state in Table 1 are as follows.

Excellent: Like asphalt, it does not adhere to machines, and has good IR and dynamic properties.

Good...Fluidity is slightly lower, but asphalt comrades,
There is no adhesion to the machine and there is no problem with continuous granulation.

Defective: Some of the asphalt particles adhered to the machine, making continuous granulation impossible.

Impossible...Crushing is not possible.

Example 6 2 kg of granular asphalt of 20 mesh or larger was sieved from the sample 1 used in Example 1, and was coated with various coatings, placed in a polyethylene bag, packaged in a tampol box, and shipped in the summer of August 30. It was stored in a warehouse for several days and its storage stability was examined.

As an alkyd resin, phenol-modified alkyl I"4
M + Fat (average molecular weight 4,000) Beccosol +3
41. Daimeki ink chemistry and industrial forest, butylated melamine resin (several f equal molecular -, ijl, 60
0) Super Beckamine J-820-EiO, a vertically rotating shaft rotary blade type pulverizer using asphalt raw material at a ratio of 20 parts by weight of resin to 80 parts by weight of asphalt, using Daimeki Ink Chemical Chemical Forest (QM-10, Yamatoka ha
(manufactured by V4) and mixed together.

In addition, wax emulsion (PHOENIX EW-
50゜Futaba Kagaku ■) was sprayed upon crushing and dehydrated and dried.

In addition, carbon black (powder M32. Mitsubishi Kasei v
4), special calcium silicate (Fluorite, Tokuyama Kaitatsu ■), talc (GTA-F, Kunimine F Industry ■), calcium bicarbonate (8 grade, Maruo Calcium ■), silicic acid (
Danite 5000. It was coated with Kunimine Chogyo ■) as follows. Granular asphalt was placed in a fixed cylindrical container, each coating powder was added directly or after adding a coating liquid, and coating was performed by rotating a rotary blade in the cylindrical container.

The results are shown in Table 2.

In Table 2, "Excellent J" refers to a state in which there is no agglomeration at all and good fluidity, and "Good" refers to a state in which there is no aggregation but fluidity is slightly lower than "Excellent".

"Effects of the Invention" As described above, when asphalt is granulated using a vertical rotating shaft type pulverizer, it is possible to granulate asphalt with a penetration level (5 to 20) that could not be pulverized with a water/rotating shaft type pulverizer. can be crushed, and the equipment is compact.

Furthermore, the desired particle size can be obtained in the cylinder by replacing the screen, and relatively large particles can be granulated later. In addition, the shape of the particles after granulation does not become flat, it is difficult to re-agglomerate, and a powdered single-grain asphalt having high quality stability over time can be obtained.

[Brief explanation of drawings]

FIG. 1 is a side view showing an example of a crusher with an eastward rotating shaft rotary blade system used in the method for producing powdery or granular asphalt of the present invention, FIG. 2 is a cross-sectional view of the crushing chamber, and FIG. The figure shows the shape of a rotary blade attached to a rotating shaft inside the crushing chamber. In addition, Figure 7JS4 is an example of a crusher with one type of rotary shaft hammer. l: hopper, 2: crushing chamber, 3 double screen, 4: main shaft (eastward), 5A: upward rotating blade, 5B: downward rotating blade,
6: Main shaft (water mower), 7: Hammer plate, 8: Hammer, 9 Ni lining plate, 10 Ni clean, 11
Niscrew, 12: Raw material, 13: Product.

Claims (2)

[Claims] (1) A method for producing powder or granular asphalt in which a lumpy asphalt raw material with a penetration degree of 0 or more and 20 or less is crushed and granulated using a crusher, in which the asphalt raw material is processed at high speed by a rotating blade attached to a vertical rotating shaft. A method for producing powder or granular asphalt, which comprises pulverizing it by rotation and then discharging it through a screen that is fully open at 360 degrees. (2) A method for producing powder or granular asphalt in which a lumpy asphalt raw material with a penetration degree of 0 or more and 20 or less is crushed and granulated using a crusher, in which the asphalt raw material is processed at high speed by a rotating blade attached to a vertical rotating shaft. A method for producing powdery or granular asphalt, which comprises pulverizing it by rotation, discharging it through a 360-degree fully open screen, and mixing or coating it with a releasable organic compound or powdery inorganic compound.