JPS61281186A - Snow melting material for preventing scattering - Google Patents

Abstract

PURPOSE:A snow melting material for preventing scattering, which will neither scatter nor disappear uselessly during application, and not settle in snow, pro duced at low cost, having a specific particle size constitution, obtained by adding black pigment and a binder solution to raw material powder having a specific particle size constitution, granulating the blend and drying it. CONSTITUTION:Raw material powder having a particle size constitution con sisting approximately of 30wt% particles with <15mm particle size, 10wt% particles with 0.15-0.35mm particle size, 40wt% particles with 0.35-0.84mm particle size, and 20wt% particles with >=0.84mm particle size is blended with black pigment and a binder solution, granulated, and dried, to give the aimed snow melting agent having particle size constitution consisting approximately of 0.6wt% particles with <0.15mm particle size, 20.6wt% particles with 0.15-0.35mm particle size, 47.1wt% particles with 0.35-0.84mm particle size, 11.0wt% particles with 0.84-1.19mm particle size and 20.7wt% particles with >=1.19mm particle size.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention is a snow-melting material that is used in snowy areas to spread on snow-covered surfaces to promote snow melting, and is particularly concerned with snow-melting materials that are used to promote snow-melting. This invention relates to an anti-scattering snow melting material that prevents snow melting and settling during snowfall.

(Prior Art) Conventionally, powdered snow melting materials and granular ones are known as snow melting materials.The former powdered snow melting materials include fly ash, calcium carbonate containing carbon black, etc. That is, the granular snow melting material is made by mixing carbon black with calcium carbonate and granulating the mixture using an appropriate binder liquid.

[Problem that the invention seeks to solve]

Most of the powdered snow melting materials mentioned above have particles with a diameter of less than 0.15 mm (approximately 70%) and are blown away by even the slightest wind when being spread, making it impossible to accurately spread them onto the snow-covered surface to be melted. In addition, carbon black, which has a particularly low specific gravity, is blown away by the wind and cannot effectively collect sunlight on the snowy surface. was there.

The above-mentioned granular snow-melting material eliminates the above-mentioned drawbacks of the powdery snow-melting material. However, conventional granular snow melting materials have a diameter of 0.15
The raw material powder is calcium carbonate etc. in which about 70% of the particles are less than m in size, and a black pigment and a binder liquid are added to this powder.
Since the particle size of the raw material powder is small, the total surface area of the particles is large, and therefore a large amount of the black pigment and binder liquid is required, and the granulation and drying time is Also, the length will be longer, and the material cost will be increased accordingly.
This had the disadvantage of increasing electricity and fuel costs, resulting in high costs.

In addition, as long as this granular snow melting material is granulated by transferring the raw material powder to it using a transfer type granulator while spraying a binder liquid, the particle size of this granular snow melting material is usually 1 to 4 m. Because the majority of them are large in size, they tend to settle during the snowfall and remain on the snow surface and cannot effectively collect sunlight, or even if the amount of spray is the same,
Compared to powdered snow melting materials, the total surface area is smaller, so
Since the light collection rate is low, there is a problem in that to achieve the same level of snow melting, it is necessary to apply more than twice the amount of powdered snow melting material.

An object of the present invention is to provide an anti-snow melting material that solves these problems.

[Means for solving problems]

The anti-scattering snow melting material of the present invention has a particle size composition of approximately less than 0.15 30% or more 0.15 or more 0.35
Less than a crane 10% 0.35 m or more and less than 0.84 crane 40% 0.84 crane or more
By adding black pigment and binder liquid to the raw material powder, which is 20%, granulating it, and drying it, the particle size composition is approximately 0.15% or less.0.6%0.15
More than m and less than 0.35 crane 20.6% 0.35w
47.1% for 0.84 m or more and less than 1.19 cranes; 11.0% for 0.84 m or more and less than 1.19 cranes; 20.7% for 1.19 m or more.

[Effect]

The present invention differs from conventional raw material powders in which most of the raw material powder, i.e. 70%, is 0.15 days old or more, and on the contrary, 70% is less than 0.15 days old.
As the particle size is larger, the total surface area is smaller, so less amount of black pigment and binder liquid is required. It can be a low-cost product because fuel costs can be saved.

In addition, since the present invention has fewer fine particles of less than o and isw, it does not have the drawbacks of conventional powdered snow melting materials such as being blown away by even the slightest wind, and it also has few or no coarse particles of 3 to 4 yen. Because it is close to the snow melting material, it does not settle in the snow like conventional granular snow melting materials, and therefore, it stays on the snow surface and sufficiently absorbs and rakes sunlight to effectively melt the snow.

〔Example〕

As a raw material powder, for example, calcium carbonate is pulverized by a pulverizer 1 so as to have the following particle size structure.

Less than 0.15 cranes 30% 0.15
Crane or larger and less than 0.35n 10% 0.35f1
40% or more and less than 0.84 m 20% of this calcium carbonate 3.
500 kg/h was fed to the mixer 2, and at the same time, 25 kg/h of carbon black was added as a black pigment, and 210 kg/h of pulp waste liquid was added as a binder liquid (optimally 6 to 7% by weight of the raw material powder). , knead these well.

Due to this crosstalk, the calcium carbonate and carbon black are mixed uniformly, and it is presumed that the calcium carbonate particles cause a small amount of carbon black to adhere to each surface in the form of a thin film due to the pulp waste liquid.

The kneaded material is then sent to the crusher 3. This crusher 3 crushes the crosstalk nodules generated during the above-mentioned crosstalk.

This completes the pre-granulation stage treatment, then feeds it to the transfer type granulator 4, and at the same time sprays 105 kg/h of pulp waste liquid as a binder liquid (optimally 3 to 4% by weight of the raw material powder). It was added and granulated. At this time, the rotational speed of the granulator 4 was set to 14 RPM, and the inclination angle was set to 55°.

After granulating with the granulator 4, it is placed in a rotary dryer 5 and dried to a moisture content of about 0.2 to 1.0%. In addition to the drying function, this dryer 5 breaks down the lump-like portions where particles adhere to each other and sorts the particles.

The particle size composition of the finished product was as follows.

Less than 0.15 fins 0.6%0215
20.6% w or more and less than 0.35u 20.6% 0.35 crane or more and less than 0.84n 47.1% 0.84 weight 1
Those below 1.19 Tsuru: 11.0% Those above 1.19 Tsuru: 20.7% Looking at this particle size composition, there are almost no particles below 0.15 W.
It is presumed that the particles were attached to the surface of particles with a diameter of 15 m or more.

In addition, as the binder liquid, in addition to the pulp waste liquid, blackstrap molasses, 7-alcohol waste liquid, etc. can be used. In addition to carbon black, black pigments include Kurobengara ()' e203
), fly ash, etc. may also be used.

After grading with the rotary dryer 5, the particles were passed through a 4B sieve 6 to further improve accuracy, but there were almost no particles with a particle size of 4M or more.

In order to achieve the same degree of black coloring as the product of the present invention using the conventional method using 3,500 kg/h of calcium carbonate, in which 70% of the particles are less than 0.15 μ in particle size, as a raw material powder, the above steps must be carried out. 35 to 70 kg/h of carbon black is required, far exceeding the 25 kg/h in the case of the example, and in this case, the binder liquid is also required at 350 to 380 kg/h, which exceeds 315 kg/h in the case of the above example.
It was confirmed through experiments that h is required.

〔Effect of the invention〕

As is clear from the above description, the snow-melting material of the present invention has particle size compositions of less than 0.15 tm and 1.
．． The percentage of items over 19m is reduced, and approximately 60% are over 0.35m and under 1.19m, so unlike conventional powdered and granular snow melting materials, it does not scatter in the wind or settle during snowfall. This eliminates the drawbacks such as snow melting, and can be expected to have a sufficient snow melting effect.

In addition, the particle size composition of the raw material powder is approximately 0.15n+
Less than 30% 0.15 cranes or more 0.
Less than 35 cranes 10% 0.35■ or more 0.84
Items shorter than a crane 40% Items over 0.84m
By using 20%, the product particle size mentioned above can be easily obtained, and in that case, the amount of pigment such as carbon blank, valve waste liquid, etc. can be reduced from the conventional 70% to less than 0.15ta. Compared to the case where raw material powder is used, the amount of particles is reduced, and the time for granulation and drying is shortened, resulting in savings in electricity and fuel costs.

[Brief explanation of drawings]

The drawing is a flowchart of the process of manufacturing the anti-scattering and snow-melting material of the present invention. 1...Crusher, 2...Kneader, 3...
... Crushing machine, 4 ... Granulator, 5 ...
・Rotary dryer ・6... Sieve.

Claims (1)

[Claims] 1. 30% particles with a particle size structure of approximately less than 0.15 mm 10% particles with a particle size structure of 0.15 mm or more and less than 0.35 mm 0.3
5mm or more and less than 0.84mm 40% 0.84mm
A black pigment and a binder liquid are added to the raw material powder, which is 20% of the above, granulated and dried, and the particle size composition is changed to 0.6% of the powder, which is approximately less than 0.15 mm, 0.6% of the powder, which is 0.15 mm or more and less than 0.35 mm. Things 20.6%0
．． 47.1% 0.35mm or more but less than 0.84mm.
84mm or more and less than 1.19mm 11.0% 1.1
A snow-shedding and snow-melting material characterized by comprising 20.7% of snow melting material with a diameter of 9 mm or more.