JPS6116682B2 - - Google Patents

Description

[Detailed Description of the Invention] This invention provides waterproofing, dustproofing, and prevention of oxidative deterioration caused by air when coal, coke, iron ore, minerals such as river sand, wood powder, etc. are deposited in open piles over a long period of time. The present invention relates to a coating method for achieving the following.

In general, coal, coke, wood powder, and the like are often deposited in steel mills, gas plants, paper mills, and the like. However, during storage, these deposits tend to stir up dust in the wind, making the work environment worse, and when it rains, the fine powder is washed away, resulting in loss of deposits. In addition, especially in the case of coal, coke, iron ore, etc., if water is absorbed during open piling and the water content in the sediment increases, energy loss due to evaporative heat loss of water increases when heating or burning it. In addition, there are problems such as difficulty in controlling heating or combustion due to fluctuations in calorific value. Furthermore, there is also the problem that these deposits are oxidized over time, impairing their original functions.

As a method to solve these problems, the surface of the deposit is coated with a paint containing powder and granules made of the same or similar material as the open deposit as a filler and dried. A method of forming a coating film that becomes water-insoluble after drying has already been proposed.

Incidentally, field deposits are a collection of large and small particles, and the surface thereof has extremely large differences in density and unevenness, as well as significant irregularities, cracks, and undulations. For this reason, it is difficult to form a continuous paint film by simply spraying the paint directly. Therefore, before applying the paint, it is necessary to flatten the surface of the deposit with a roller or water it. Alternatively, an aqueous solution is sprayed on the surface of the deposit to make the surface dense.
It has been proposed to shape and level the deposit by so-called pre-treatment.

Although all of the above pretreatment methods are effective, surface smoothing using rollers requires specialized equipment and has drawbacks such as difficulty in uniformly flattening the entire surface of the deposit if the deposit is large. However, the method of spraying water or the like has drawbacks such as the fact that the paint cannot be applied until several hours have passed after the spray has dried.

In view of the above-mentioned problems, the inventors continued to study paints and application methods, and as a result, they found that by spraying fillers on the surface of open piles in advance, and then spraying the paint, a uniform and continuous coating was applied. It was discovered that a coating film could be easily formed on the surface of the deposit, and this invention was completed.

That is, the present invention is directed to an open pile, which is characterized in that a filler selected from the same or similar powder as the pile is sprinkled on the surface of the pile, and then a paint that becomes water-insoluble after drying is sprayed. This relates to a method of covering objects.

The open deposits applied to this invention include, for example, coal (powder), coke (powder), iron ore, minerals such as river sand, copper ore, limestone, bauxite and other metal ores, or organic powders such as wood powder. Things, etc.

The filler in this invention is selected from granules made of the same or similar material as the field deposits, as described above. Here, "same or similar" refers to something that has the same or similar function or use as a deposit, and includes those that do not substantially affect the use of the deposit.

The particle size of these fillers is preferably adjusted so that the 5 mesh pass product accounts for 80% or more and the 40 mesh pass product accounts for 20% or more.

These fillers are sprayed prior to application of the paint. Methods for this include spraying only the filler directly onto the surface of the field deposits, or spraying the filler in the form of a slurry or suspension in water or water containing chemicals. When open deposits are large-scale, the former method tends to cause dust to fly around and there is concern about environmental deterioration, so the latter method is usually adopted. In that case, it is better to slurry or suspend the filler in water containing some kind of drug, rather than simply slurrying or suspending the filler in water.

The agent to be added here is not particularly limited, but includes, for example, alcohol, cellosolve, surfactant, etc., alone or in a mixture of two or more, to improve the compatibility of the filler and compact it. A material that has the effect of improving the wettability of the paint applied next is adopted. Among such drugs, it is effective to add a small amount of fiber reinforcing material to those capable of forming a film to strengthen the film strength.

In addition to the above-mentioned chemicals and reinforcing materials, antisettling agents, dispersants, antifoaming agents, antifreeze agents, and the like may be added to improve workability.

The above filler is applied to the surface of the above open deposit.
It is sufficient to spray it at a rate of 0.1 to 5 kg/m ² .

In this way, after the filler is spread on the surface of the field deposit, the paint is spread. As this paint, any conventional paint can be used as long as it becomes water-insoluble after drying, and it may be either a water emulsion type or an organic solvent type.

Since the surface of the field deposits is extremely smooth and dense due to the spraying of the filler, the coating film formed by applying the above-mentioned paint easily becomes a continuous and uniform film, fully demonstrating the characteristics of the coating film. become able to. Furthermore, since the paint is applied after the surface condition of the open deposits has been improved, the application efficiency is improved and there is also the advantage that the amount of paint used, that is, the yield, can be improved.

Next, embodiments of the invention will be described.

Example 1 In a pile of open iron ore with a floor area of 3200 m ² and a height of 10 m,
A solution made by adding 40 parts by volume of iron ore powder with an average particle size of 250μ to 100 parts by volume of water was sprayed at 2 kg/ ^m2 , the surface was leveled, and the coating paint shown below was applied. By letting it dry naturally, it becomes about 3cm thick.
A coating film of mm was formed.

<Coating paint> Air-drying varnish (Nittol 120c manufactured by Nitto Electric Industry Co., Ltd.) 100 parts by volume xylene 100 parts by volume Iron ore powder of 5 mesh or less 700 parts by volume The open deposits coated with the above method will last for about 6 months. It did not disintegrate even after the elapsed time, and during this period, no scattering or washing away of ore powder, and no oxidative deterioration was observed.

Example 2 Coal powder with an average particle size of 500 μ was added to an open pile of coal powder with a floor area of 5000 m ² and a height of 15 m per 100 parts by volume of a 5% propylene glycol aqueous solution.
A suspension made by adding 80 parts by volume was sprayed at ² kg/m2,
After leveling the surface, apply the coating paint shown below.
This was air-dried to form a coating film with a thickness of about 2 mm.

<Coating paint> 50% by weight water emulsion of styrene-butyl acrylate 35/65 copolymer 100 parts by volume 4% by weight aqueous solution of carboxymethylcellulose
15 parts by volume Butyl cellosolve 2 parts by volume 10% by weight aqueous solution of sodium hexametaphosphate
0.8 volume parts water 20 volume parts 5 mesh passes of coal powder 500 volume parts The field deposits covered with the above method did not disintegrate even after about 6 months, and during this period no scattering or washing away of the coal powder and no oxidative deterioration were observed. I couldn't help it.

Example 3 A 4% by weight aqueous solution of methylcellosolve was applied to the surface of an open pile of wood flour with a floor area of 2600m ² and a height of 15m.
After spraying 4 kg/m2 of a mixture of 50 parts by volume of wood powder with an average particle size of 100μ and ² parts by volume of cellulose fibers having an average length of 3 mm on 100 parts by volume, the coating paint shown below was applied. was air-dried to form a coating film with a thickness of about 4 mm.

<Coating paint> 50% by weight water emulsion of 30/70 styrene-butadiene copolymer 100 parts by volume Ethyl cellosolve 1 part by volume Water 50 parts by volume 2.5 parts by volume Wood flour 200 parts by volume Piled pile coated by the above method The material did not disintegrate even after approximately 6 months had passed, and no wood powder was observed to be scattered or washed away during this period.

Comparative Example 1 In a pile of open iron ore with a floor area of 3200 m ² and a height of 10 m,
The coating shown in Example 1 was applied to form a coating film with a dry thickness of about 3 mm. After about two months, the coating film obtained by this method showed cracks and some of the iron ore powder was observed to have washed away.

Comparative Example 2 The paint shown in Example 1 was applied to a pile of iron ore with a floor area of 3,200 m ² and a height of 10 m to form a paint film with a dry thickness of 7 mm. The coating film obtained by this method showed cracks after about 4 months.

Claims (1)

[Claims] 1. A filler selected from powder and granular material made of the same or similar material as the deposit is sprayed on the surface of the open deposit in advance, and then a water-insoluble paint is applied after drying. A method for covering open deposits, characterized by: 2. The method of covering field deposits according to claim 1, wherein the filler is dispersed and sprayed in water or water containing a drug.