JPS61272280A - Snow-melting agent - Google Patents

Abstract

PURPOSE:To obtain a snow-melting agent free from secondary pollution due to calcium chloride, with high spreading efficiency, especially suitable for orchard, gold course, etc., by grinding ash discharged from coal combustion unit or coal gasifier into size below a specific level followed by sieving treatment. CONSTITUTION:The objective snow-melting agent can be obtained by grinding dried granular and/or bulk product(s) from the ash discharged from coal combustion unit or coal gasifier into size <=2.5mm followed by sieving treatment. Preferably, the content of granules with a size <=88mum is <=10wt% in the above processes. This agent is incorporated with such ingredient(s) as ammonium sulfate, ammonium phosphate, urea, calcium carbonate powder or calcium oxide powder to apply to crops, orchard, roadside trees, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a snow-melting agent used to promote snow melting during winter snow accumulation.

[Prior Art] In snowy regions such as Hokkaido, the Tohoku region, and the Hokuriku region, where there is a lot of snowfall in winter, there is a desire for a snow melting agent that has a large effect on accelerating snow melting on golf courses, farms, orchards, pastures, roads, etc. .

Conventionally, this type of snow-melting agent is known to be obtained by pulverizing coal that is a by-product when coal is extracted from a coal mine, or one that uses calcium chloride as the main raw material.

[Problems to be solved by the invention] However, since bota is a natural mineral, there are problems with the raw material itself, such as depletion of the raw material, fluctuations in the composition of the raw material, and the need for a large amount of money to collect the raw material.

Moreover, the snow-melting agents currently available on the market that are made mainly from botanicals have a large proportion of fine particles with particle diameters of 88μ or less steel, which tend to scatter during spraying, making them less effective.

In addition, snow melting agents that use calcium chloride as a main ingredient have negative effects such as inhibiting the growth of crops, fruit trees, roadside trees, etc. and causing rust on iron parts of vehicles due to the action of chlorine ions, causing secondary pollution. There are concerns that

[Means for Solving the Problems] The present inventors have made the present invention as a result of intensive research to solve the above problems, and the first invention is a coal combustion device. Or crush the dried ash particles and lumps discharged from the coal gasifier to 2.51 or less,
The sieve is a snow melting agent obtained by processing, and the second invention is a method of crushing dried ash particles and lumps discharged from a coal combustion device or a coal gasification device to 2.5 nV or less,
Sieve is a snow melting agent made by mixing the treated snow with one or more of fertilizer components such as ammonium sulfate, ammonium phosphorus, and urea, and/or lime components such as calcium carbonate powder and quicklime powder. .

That is, the present invention is a method of discharging coal ash in a molten or semi-molten state from a coal combustion device such as a slag tap boiler or a coal gasification device using the Texaco method using a high temperature pressurization method into water or the like. Granules or lumps formed by cooling and solidification are used, dried, crushed and sieved to a size of 2.5 mm or less, more preferably 1.2 mm or less. At this time, the presence of fine particles of 88 μm or less is unavoidable, but it is particularly preferable if this proportion is 10% by weight or less, since scattering during use is small. As a snow melting agent, particle size of 2.51111 or less is sufficient, but 1.2 m
It is more effective if it is less than m.

In the second invention, the amount of fertilizer and lime to be mixed is preferably 20% by weight or less. When these amounts exceed 201i amount%,
This is not preferable because the effect as a snow melting agent is diminished.

[Example] Next, examples and comparative examples will be described.

Example 1 100 kQ of granular slag discharged from a coal gasifier was dried at 100°C in a dryer and sieved using a vibrating sieve equipped with a wire sieve with a mesh opening of 2.5 mm to simulate pulverization in a pulverizer. A snow melting agent with a particle size of 2.5 mm or less was obtained.

The granular slag used was found to be amorphous by xi diffraction, and its particle size distribution is shown in Table 1, and its chemical composition is shown in Table 2.

Furthermore, the particle size distribution of the obtained snow melting agent is shown in Table 3.

Using this snow melting agent, blackness, floating powder ratio, and solidification were tested, and a rough ice melting test and an on-site snow melting test were conducted.

These results are shown in Table-4.

■■ Example 2 A snow melting agent with a particle size of 1.2 ml or less was obtained in the same manner as in Example 1, except that a rope sieve with a mesh opening of 1.2 mm was used. Table 3 shows the particle size distribution of the obtained snow melting agent. Table 3 Using this snow melting agent, blackness, floating powder ratio, solidification, ice melting test, and field snow melting test were conducted. These results are shown in Table 4.
Shown below.

Examples 3 to 15 10% calcium carbonate powder added to the snow melting agent obtained in Example 2
(Example 3), 10% quicklime powder (Example 4), 20% calcium carbonate powder (Example 5), 20% quicklime powder (
Example 6), ammonium sulfate 20% (example 7), ammonium phosphorus 20% (example 8), urea 20% (example 9), urea 10%, calcium carbonate powder 10% (example 10), ammonium phosphorus 10%, quicklime powder 10% (Example 11), 10% ammonium sulfate, 10% quicklime powder (Example 12), 10% ammonium sulfate, 5% calcium carbonate powder and 5% quicklime powder (Example 13), 5% ammonium sulfate
%, phosphorus ammonium 5%, urea 5% and calcium carbonate powder 5%
(Example 14), a snow melting agent was prepared by mixing 5% ammonium eft, 5% ammonium phosphorus, 5% urea, and 5% quicklime powder (example 15), and the same test as in example 2 was conducted. . The results are shown in Table 4.

Comparative Example 1 An ice melting test and an on-site snow melting test were conducted without using a snow melting agent. The results are shown in Table 4.

Table 4 111) Value obtained by subtracting the L value measured by Nippon Denshokuko M color difference meter 2-Σ80 type from 1oO J12) Floating powder rate - (dry weight of floating powder floating on the water surface / total sample placed in water) Dry amount fl) x 100mine 3) Water ratio 3
4) Infrared lamp (manufactured by Matsushita Electric Industrial ■, industrial infrared lamp 1o)
ov-125W) with ice covered with gauze (W26
．． 0CIIXL33.5CIIIXT 2.9cm>Irradiate perpendicularly to the top surface at a distance of 30cm), and measure the ice melting rate at each elapsed time. The room temperature in the test room was -0.5°C.

However, Example 1-. In Comparative Example 1, the snow melting agent was sprayed on the gauze surface covered with ice at a rate of 40Q per m2, and in Comparative Example 1, the snow melting agent was sprayed/water used for ice making.
X 1001T5) In Examples 1 to 15, a snow-melting agent was sprayed on a snow-covered area (Mine City, Yamaguchi Prefecture, snow depth 50 mm) at a rate of 40 g per 11 m2, and in Comparative Example 1, a snow-melting agent was not sprayed. Snow melting time during sunshine was measured.

The area of each snow melting test was 5 m x 5 m.

[Effects of the Invention] The snow melting agent of the present invention is made from high-temperature heat-treated ash that is discharged in a molten or semi-molten state from a coal combustion device or a coal gasification device, so it does not contain germs and does not contain agricultural products, It does not contain anything harmful to fruit trees, roadside trees, etc.

The granules and lumps discharged from coal combustion equipment or coal gasification equipment in a molten or semi-molten state are mostly composed of amorphous materials, so fine particles are generated during the crushing process. However, the particle size structure of the snow melting agent of the present invention is relatively uniform, and the proportion of fine particles of 88 μm or less is essentially small. Therefore, when spraying on golf courses, farms, orchards, etc., there is no loss due to scattering or flying up, and it can be sprayed effectively. In addition, when spraying, it can be effectively sprayed either mechanically for six-layer spraying or manually for sublayer spraying. In addition, the maximum particle size of the particles was set to 2.5 m.
Since the snow melting agent is limited to m, even if the snow melting agent remains after being sprayed on a golf course and melting snow, it will not affect the rolling of golf balls. The surface blackness of this snow melting agent is high, so it absorbs a lot of solar heat and effectively transfers the absorbed heat to the snow, so it has a great snow melting effect. The surface blackness of the snow melting agent does not decrease even if left for a long period of time, and the color does not fade even when it comes into contact with water, so it is possible to maintain its effectiveness as a snow melting agent for a long period of time. This snow melting agent is easy to handle because it does not solidify with water after melting snow and does not float on the water surface.

In addition, snow melting agents with fertilizer and lime added have fertilizer properties for crops, plants, fruit trees, etc. in the state of lightning extinguishment after snow melting, and lime , a mixture is effective for improving acidic soil, and a mixture of both fertilizer and lime has both of the above properties.

Claims (3)

[Claims] (1) A snow melting agent obtained by crushing and sifting dried ash particles and lumps discharged from a coal combustion device or coal gasification device into pieces of 2.5 mm or less and sieving them. (2) Dry ash particles and lumps discharged from coal combustion equipment or coal gasification equipment, crushed and sieved to 2.5 mm or less, and fertilizers such as ammonium sulfate, ammonium phosphorus, and urea. A snow melting agent made by mixing one or more types of lime components such as/or calcium carbonate powder and quicklime powder. (3) Claims (1) or (2) in which the weight ratio of ash passing through a sieve of 88 μm or less is 10% by weight or less
The snow melting agent described in section.