JPS6116683B2 - - 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, river sand, ore, wood powder, etc. are deposited in open piles over a long period of time. The present invention relates to a coating method for achieving this.

In general, coal, coke, wood powder, and the like are often piled up in open piles at 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 deposit loss. 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 disadvantages such as variations in calorific value that make it difficult to control heating or combustion. Furthermore, there is also the problem that these deposits are oxidized over time, impairing their original functions.

As a method for solving these problems, a method is known in which a paint is applied to the surface of the deposit and dried to form a water-insoluble coating film on the surface of the deposit. According to this method, it is possible to prevent the scattering of dust, runoff due to rainfall, and increase in water content.

However, in general, open deposits are extremely long and are a collection of large and small particles, so
Its surface is extremely fragile, and its shape changes due to its own weight, wind pressure, and rainfall, causing cracks and landslides. Therefore, even if the above paint is applied to the surface of open piles, the paint film will tear or fall off due to changes in the shape of the piles over time, resulting in loss of waterproof, dustproof and anti-oxidation functions. will be done.

As a result of continuing to study the above problem, the inventors found that by combining the method of piling up open deposits and the method of applying paint, the deposits were stabilized and the coating film was thereby torn. The present inventors have discovered that the properties can be sufficiently maintained over a long period of time without the risk of it becoming stuck or falling off, leading to the completion of this invention.

That is, in this invention, a part of the deposit is piled up in the shape of a plateau, a coating paint is applied to the slope portion and at least the shoulder part, and then a part of the deposit is piled up on the plateau in the same manner as described above. After piling up small piles like a plateau, apply the same paint to the slopes and at least the shoulders, and then repeat this operation to pile up the pile and apply paint to the required parts at the same time. The present invention relates to a method for covering open deposits characterized by the following.

The open deposits applied to this invention are, 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. It is.

The method of depositing and covering the field deposits according to the present invention will be explained below with reference to the drawings.

First, a part of the sediment is piled up over the entire floor surface where it is planned to be deposited to create a first sediment plateau as shown in Figure 1 (A).
Form M ₁ . The height of the stack on the plateau _M1 varies depending on the deposits, but it must be kept to a level that will not cause cracks or landslides on the slope _M1a due to its own weight. The top surface M _1c of this plateau M ₁ does not need to be particularly smooth. Although the slope portion M _1a of this sediment plateau M ₁ is in a stable state, it is effective to further strengthen it by means such as mechanical compaction or liquid spraying treatment to further stabilize it.

After the formation of the first sedimentary plateau _M1 , this plateau
As shown in the figure (B), paint N ₁ which becomes water-insoluble after drying is applied to slope portion M _1a and shoulder portion M _1b of M ₁ . Thereafter, a second sediment plateau _M2 , which _is slightly smaller than the plateau M1, is stacked on top of the first sediment plateau M1, as shown in FIG. ₂ (C). Similarly to the case of the first plateau _M1 , the stacking height of this plateau _M2 is kept to a level that does not cause cracks or landslides due to its own weight.

Then, in the same manner as above, this second plateau M ₂
The same paint N ₂ as described above is applied to the slope portion M _2a and the shoulder portion M _2b as shown in the same figure (D). After that, repeat this operation, and as shown in the same figure (E), on the top plateau M _o ,
By applying the paint to the top surface M _oc as well, the coating of the open deposit M is completed.

In this invention, the above paint is applied to each plateau M ₁ to _{M o}
Various methods such as a spray coating method and a flow coating method can be used to apply the coating to the surface. Normally, the paint film may be allowed to dry naturally, but if the subsequent piling up of the plateau is to be done in a hurry, forced air may be used to speed up the drying.

In the above paint application work, it is particularly important to apply the paint to each of the shoulders M _1b to _{M ob} of the plateaus M ₁ to M _o . This is because the shoulders M _1b to M _ob are the areas where cracks and landslides are most likely to occur, and fixing these areas with a coating film is extremely effective in stabilizing the entire plateau and, by extension, the entire field deposit.
It should be noted that there is no problem in applying paint to each of the top surfaces M _1c to M _o - _1c of the plateaus M ₁ to _{M o} - ₁ , as long as the saving of paint consumption is ignored;
It can contribute to further stabilization of M ₁ to M _{o −1} .

The coating paint used in this invention, that is, the paint that becomes water-insoluble after drying, is not particularly limited as long as it can exhibit effects such as waterproofing, dustproofing, preventing oxidative deterioration, and preventing landslides.
A wide variety of conventional methods can be used, and both water emulsion and organic solvent systems may be used.

If it is difficult to satisfy all of the above effects, two or more types of paints may be mixed or overcoated to form a multilayer film to cover the characteristics. Furthermore, it is not inconsistent with this method to add fillers or fibrous reinforcing materials to improve the strength of the paint film, or to add foaming agents to reduce the weight and increase the thickness of the paint film. However, it can be adopted as appropriate. If a granular material made of the same or similar material as the field deposit is selected as the filler, the properties of the coating film can be further enhanced.

As described above, in the coating method of the present invention, the formation of sediment plateaus and the application of paint to predetermined parts of each plateau are performed alternately, so that the stabilization of open deposits is ensured, and it is possible to prevent rainfall, wind pressure, and dead weight. As a result, changes in shape are suppressed, and therefore, the effects of waterproofing, dustproofing, preventing oxidative deterioration, and preventing landslides of open deposits can be exerted over a long period of time.

Next, examples will be described.

Example: When piling up open deposits made of coal powder, part of the deposits is placed in a pile with a base area of 35 m x 50 m and a height of 2 m.
It was piled up like a plateau. The slopes of this sedimentary plateau were smooth, with no cracks or landslides. Next, 3 kg/m ² of coating paint having the composition shown below was applied to the entire slope of this deposit and the shoulder with a width of 1 m from the outer edge to form a coating film with a thickness of 3 mm. .

Next, on top of this first stage is a slightly smaller plateau, with a base area of 31m x 46m and a height of 2.
The sediment was piled up to a size of m, and then the same paint as above was applied to the entire slope of this second plateau and the shoulder with a width of 1 m from the outer edge. . After that, this operation was repeated to form a sediment plateau with a floor area of 19 m x 34 m and a height of 2 m at the top. Paint was applied to the top surface of this top plateau as well as the slope and shoulders. This completed the formation of an open pile with a total height of 10 m and the coating of paint.

<Coating paint> 50% water emulsion of styrene-butyl acrylate 35/65 copolymer
100 parts by volume 4% by weight aqueous solution of carboxymethyl cellulose
15 parts by volume Butyl cellosolve 2.0 parts by volume 10% by weight aqueous solution of sodium hexametaphosphate
0.8 parts by volume water 20 parts by volume 5 mesh passes of coal powder 1000 parts by volume The deposit coated in this way remains extremely stable even after about 6 months, and there is no scattering or leakage of coal powder and no oxidative deterioration. No increase in water content was observed.

Comparative Example A deposit made of the same coal powder as in the example was deposited on the floor area.
The piles were piled up in the shape of a plateau measuring 35 m x 50 m and 10 m in height, and 3 kg/m ² of the same paint as used in the example was applied to the surface of the pile to form a coating film with a thickness of 3 mm. After three days, cracks appeared on the slope of this open deposit, and about a month later, rain caused a landslide.

[Brief explanation of the drawing]

FIGS. 1A to 1E are cross-sectional views showing the steps of forming a plateau and applying paint applied to the method of the present invention in the order of operations. M... field deposits, M ₁ - M _o ... plateau, M _1a - _{M oa}
... Slope portion, M _1b - M _ob ... Shoulder portion, M _1c - M _oc ... Top surface portion.

Claims (1)

[Claims] 1. Each plateau formation process in a multi-level sediment plateau, which becomes smaller as it is piled up, and which constitutes an open deposit as a whole, and drying on the slopes and at least the shoulders of the plateau each time each plateau is formed. A method for coating open deposits, characterized in that the steps of applying a coating paint that later becomes water-insoluble are repeated alternately, and the above paint is also applied to the top surface of the uppermost terrace.