KR100724056B1 - Composition for coating the surface of solids comprising solid-state fossil fuels - Google Patents

Abstract

The present invention relates to a surface coating composition of a solid fossil fuel solid, which is coated on a solid fossil fuel solid, and prevents the phenomenon of solid fossil fuel solids cracking due to freezing and melting at daily temperature changes, and rainfall It effectively blocks the penetration of moisture even under water, and has the advantage of being readily available when needed.

Coating, cladding, cracking, penetration, coke, waterproof

Description

Composition for coating the surface of solids comprising solid-state fossil fuels}

The present invention relates to a surface coating composition of a solid fossil fuel solid, and more particularly, it is treated on the surface of the solid fossil fuel solid, the moisture even at the daily temperature and rainfall from a minimum of minus 60 ℃ to a maximum image 100 ℃ The present invention relates to a surface coating composition that can prevent cracking due to freezing, melting, and the like without penetrating into the interior thereof.

Coke, a type of solid fossil fuel solid, provides the energy needed to dissolve slag and iron in the furnace, provides the energy needed to produce the reaction, generates the gas needed to reduce iron oxide, serves as a mechanical support, and It also serves as a permeable membrane that allows the flow of iron. In terms of operation, the raw coal in the coke oven is dried for 16 to 17 hours at a temperature of 1200 ° C. to produce coke, and the coke thus produced can be used as a raw material for blast furnaces by satisfying the quality standards. The quality of the coke is very important as it will have a big impact on the blast furnace operation, the next process. The quality is mainly determined by ash, volatiles, sulfur content, strength, etc. For example, a 1% change in coke cold strength is known to change the output of the blast furnace by 2%. Therefore, the fuel tends to increase by 15 to 20 kg. For this reason, much research has been conducted on improving the pretreatment process of raw materials for improving the quality of coke.

Research for improving the coke pretreatment process is also required, but the storage method during the storage period is also very important in order to maintain the excellent quality at the time of use.

Currently, POSCO Co., Ltd. prevents cracking of coke by storing coke before use after manufacture and isolating it from moisture or temperature change. However, this method has a problem that the storage cost is high. Meanwhile, in other industries, imported coke is left as it is. In this case, if the moisture content in the air increases due to a factor such as rainfall, moisture may penetrate into the coke, causing coke cracking, resulting in deterioration of quality, and re-drying during use. You spend money.

For the reason described above, there is an urgent need for a new coke storage method that can prevent cracks from occurring even if the solid fossil fuel solids are left unchanged for a long time under daily temperature changes and rainfall.

Therefore, the present inventors have conducted a number of studies to solve the conventional problems, as a result of coating the solid fossil fuel solids using the coating composition of the present invention even if left for a long time under daily temperature changes and rainfall, The present invention has been completed by discovering that cracks do not occur in the body.

It is an object of the present invention to provide a surface coating composition of a solid fossil fuel solid which is coated on the surface of the solid fossil fuel solid to prevent cracking of the solid fossil fuel.

In order to achieve this object, the surface coating composition of the solid fossil fuel solid of the present invention contains 20 to 35% by weight of rosin, 10 to 20% by weight of sodium hydroxide, 20 to 35% by weight of nonionic surfactant and the balance as water Characterized in that.

Hereinafter, the present invention will be described in more detail.

The surface coating composition of the solid fossil fuel solid according to the present invention is configured to contain rosin, sodium hydroxide, nonionic surfactant and water.

Among these components, rosin serves to increase the density by improving the waterproofness and adhesion between the particle sizes of the mixture. If it is contained in an amount of less than 20% by weight may have a problem of lack of adhesion to the coated surface, when contained in an amount of more than 35% by weight increases the product cost, 20 ~ to the total weight of the coating agent It is contained in an amount of 35% by weight. More preferably, it is contained in the amount of 24 to 27 weight%.

Sodium hydroxide decomposes and neutralizes organic substances in the mixture. If it is contained in an amount of less than 10% by weight, there may be a problem that the degradation of organic matters is deteriorated. It may be adversely affected, so it is contained in an amount of 10 to 20% by weight based on the total weight of the coating agent. More preferably, it is contained in the amount of 13-17 weight%.

Nonionic surfactants play an important role for agglomeration and dispersion of coating agents as nonionic emulsifiers and polymer coagulants, and may be more preferably used as long as they are ester-based nonionic surfactants having high water absorption. If it is contained in an amount of less than 20% by weight may have a problem that the emulsification and dispersion is lowered, and if it is contained in an amount of more than 35% by weight may cause a problem in the formation of a float, 20 to 35 relative to the total weight of the coating It is contained in an amount of% by weight. More preferably, it is contained in the amount of 24 to 28 weight%.

Water is contained to accommodate the adaptation of the water content to occupy the remaining amount except the above components. If too little water is contained, there may be a problem that the emulsion dispersion does not occur properly. If too much water is present, there may be a problem that the adhesion between the mixture particles and the water resistance is reduced, so the water content should also be adjusted to a suitable range. . Most preferably, it is contained in an amount of about 30 to 35% by weight based on the total weight of the coating agent.

The coating composition of the present invention prepared by mixing the above components is to cover the surface of the solid fossil fuel solids with a suitable thickness to prevent cracking, in the present invention 'solid fossil fuel solids' is the existing coke It is defined as including not only a single solid formed from solid fossil fuels such as powdered coke, anthracite coal and bituminous coal, but also a mixed solid formed from two or more of these fuels as raw materials.

In addition, the solid fossil fuel solid of the present invention is mixed with one or two or more solid fossil fuels by adding a solidifying agent, and then molded, the formed molded body of 100 ~ 300 ℃ It may include those prepared by heating at a temperature, wherein the solidifying agent is 25 to 35% by weight emulsion asphalt, 0.05 to 0.20% by weight emulsifier for asphalt, 0.1 to 0.3% by weight hydrochloric acid, 0.01 to 0.05 calcium chloride It is preferable to contain water as 0.005 to 0.030 weight% and the remainder by weight%, 0.01 to 0.05 weight% of oleic acid, 1 type, or 2 or more types of mixture of a cationic or amphoteric surfactant. More preferably, the solid is prepared by mixing 3 to 10 parts by weight of the solidifying agent with respect to 100 parts by weight of solid fossil fuel.

Hereinafter, the present invention will be described in detail with reference to Preparation Examples and Comparative Preparation Examples, but the present invention is not limited only to these examples.

Preparation Examples 1 to 3 and Comparative Preparation Examples 1 to 2 Coating Compositions

Rosin (Daemyung Chemical, imported from China, Korea), sodium hydroxide (NaOH: Yeongjin Chemical, Korea), nonionic surfactant (OP-85R, Kao Corp., Japan) and water to the content of Table 1 below After quantifying each component, it was heated to 80 ℃ and mixed according to a conventional method to prepare a coating composition of the following Preparation Example and Comparative Preparation Example.

Ingredient (% by weight) Production Example Comparative Production Example One 2 3 One 2 rosin 25.974 21.000 32.000 18.00 25.97 Sodium hydroxide 14.7186 12.6692 17.0996 14.72 14.72 Nonionic surfactant 25.974 22.3574 30.1757 25.97 18.00 water Remaining amount Remaining amount Remaining amount Remaining amount Remaining amount

Example 1 Preparation of Coke

General coke (POSCO Co., Ltd .; Test Group 1) to be used as a coating material for measuring the efficacy of the coating agent of the present invention is prepared, and coke (Test Group 2) prepared by adding a solidifying agent is prepared.

<Production of Solidifying Agent-Containing Coke (Test Group 2)>

First, 29.6% by weight of an emulsified asphalt (AP-3; manufactured by Korea Emulsion, Korea) was heated to 130 ° C., 0.14% by weight of an emulsifier for asphalt (Farmin ST-7; manufactured by Kao Corp., Japan), and 0.22 hydrochloric acid. Wt%, calcium chloride 0.03% by weight, oleic acid 0.03% by weight, surfactant (NP-8; Yeongchang Chemical, Korea) 0.01% by weight and the remaining water are heated to a temperature of 80 ℃ to emulsify and disperse all these components The topic was prepared.

The powdered coke is put into an input hopper installed in a normal coke forming facility line, then transferred to a storage hopper for weighing, mixed with a solidifying agent prepared in advance in a tube raid mixer, and molded at a pressure of 5 kg / ㎠ in a molding machine. Was discharged and then heated to a temperature of 100 ° C. or higher in a stabilization device to produce shaped coke. At this time, the solidifying agent was used in an amount of 10 parts by weight based on 100 parts by weight of powdered coke.

Example 2 Preparation of Coke Treated or Untreated

In order to evaluate the efficacy of the coating composition, Examples 1 to 6, in which Test Group 1 or 2 was treated with the coating agent of any one of Preparation Examples 1 to 3, and Test Group 1 or 2, Comparative Example 1 or 2 were treated or Untreated Comparative Examples 1 to 6 were prepared as shown in Table 2 below. In order to obtain clearer comparative data, the coke and the coating agent in the Examples and Comparative Examples used the same amount, except in the case of no coating treatment. Specifically, test group 1 or 2 was instantaneously immersed in the coating, and then dried for 1 hour in a natural state as a test material.

cokes Coating Example One Test group 1 Preparation Example 1 2 Test group 1 Preparation Example 2 3 Test group 1 Preparation Example 3 4 Test group 2 Preparation Example 1 5 Test group 2 Preparation Example 2 6 Test group 2 Preparation Example 3 Comparative example One Test group 1 No treatment 2 Test group 1 Comparative Production Example 1 3 Test group 1 Comparative Production Example 2 4 Test group 2 No treatment 5 Test group 2 Comparative Production Example 1 6 Test group 2 Comparative Production Example 2

Test Example 1 Water Resistance Evaluation-Permeability Coefficient According to Repeated Freeze-thawing

Permeability coefficient evaluation experiment was performed according to repeated freezing and thawing to evaluate water resistance. According to the usual permeability coefficient evaluation method, a variable law method was applied to a sample with low permeability, and a test device for supplying water was manufactured to a temperature of -60 ° C. in a large Lysimeter for 1 day. Freezing and freezing and thawing at 100 ° C. in an electric oven for one day were repeated three times, seven times, and ten times for the cokes of Examples 1 to 6 and Comparative Examples 1 to 6, respectively, and the results are shown in Tables 3 to 3 below. 5 is shown respectively.

Sample (3 times freezing) Water content (Wn) (%) Unit weight (rd) (g / cm 3) Permeability coefficient (k) (cm / sec) Example 1 14.5 1.874 3.96 x 10 ^-7 Example 2 14.5 1.874 3.82 x 10 ^-7 Example 3 14.5 1.879 3.83 x 10 ^-7 Example 4 14.5 1.878 3.72 x 10 ^-7 Example 5 14.5 1.878 3.92 x 10 ^-7 Example 6 14.5 1.874 3.88 x 10 ^-7 Comparative Example 1 14.5 1.847 3.43 x 10 ^-6 Comparative Example 2 14.5 1.874 9.87 x 10 ^-7 Comparative Example 3 14.5 1.876 8.34 x 10 ^-7 Comparative Example 4 14.5 1.865 3.50 x 10 ^-6 Comparative Example 5 14.5 1.874 9.12 x 10 ^-7 Comparative Example 6 14.5 1.876 8.70 x 10 ^-7

Sample (7 times freezing) Water content (Wn) (%) Unit weight (rd) (g / cm 3) Permeability coefficient (k) (cm / sec) Example 1 14.5 1.887 4.81 x 10 ^-7 Example 2 14.5 1.890 4.71 x 10 ^-7 Example 3 14.5 1.888 4.87 x 10 ^-7 Example 4 14.5 1.891 4.64 x 10 ^-7 Example 5 14.5 1.890 4.73 x 10 ^-7 Example 6 14.5 1.887 4.82 x 10 ^-7 Comparative Example 1 14.5 1.860 8.78 x 10 ^-6 Comparative Example 2 14.5 1.886 1.72 x 10 ^-6 Comparative Example 3 14.5 1.887 9.61 x 10 ^-7 Comparative Example 4 14.5 1.869 8.66 x 10 ^-6 Comparative Example 5 14.5 1.890 1.87 x 10 ^-6 Comparative Example 6 14.5 1.887 9.42 x 10 ^-7

Sample Water content (Wn) (%) Unit weight (rd) (g / cm 3) Permeability coefficient (k) (cm / sec) Example 1 14.5 1.882 8.09 x 10 ^-7 Example 2 14.5 1.890 7.89 x 10 ^-7 Example 3 14.5 1.881 8.21 x 10 ^-7 Example 4 14.5 1.896 8.08 x 10 ^-7 Example 5 14.5 1.892 8.12 x 10 ^-7 Example 6 14.5 1.882 7.93 x 10 ^-7 Comparative Example 1 14.5 1.856 1.55 x 10 ^-5 Comparative Example 2 14.5 1.886 2.71 x 10 ^-6 Comparative Example 3 14.5 1.891 1.61 x 10 ^-6 Comparative Example 4 14.5 1.865 1.59 x 10 ^-5 Comparative Example 5 14.5 1.879 2.77 x 10 ^-6 Comparative Example 6 14.5 1.881 1.37 x 10 ^-6

As can be seen in Tables 3 to 5, the more the number of freeze-thaw repetition increases the overall permeability coefficient shows a tendency of poor waterproofness, but in the case of Examples 1 to 6 coating the coating composition of the present invention, the coating agent The composition was found to be about 10 times impermeable than Comparative Examples 1 and 4 without treatment. In addition, even if the freeze-thaw repetition frequency of Examples 1 to 6 is increased to 10 times, it is lower than the permeability coefficient when the freeze-thaw repetition frequency of Comparative Examples 1 and 4 is performed three times, thereby reconfirming excellent waterproofness. . In addition, Comparative Examples 2 and 5, which coated the coating composition prepared using a small amount of rosin, and Comparative Examples 3 and 6, which treated and coated the coating composition prepared using a small amount of nonionic surfactant, were more permeable than the examples. As the coefficient is high, it can be confirmed that the waterproof effect is not better than Examples 1 to 6. On the other hand, the permeability coefficient of Examples 1 to 3 for the coke prepared by treating the coke and the coke prepared for the general coke was confirmed to have a similarly low value, except from this It can be expected to have a similar effect when treating the coating of the present invention on a variety of solid fossil fuel solids.

Test Example 2 Evaluation of Adhesiveness

After filling the tank with a certain amount of water, the samples of Examples 1 to 6 were soaked to measure the content of the coating agent dissolved in water after 1 day, 3 days, and 7 days. As a result, it can be seen that the components of the coating agent dissolved during the 1 to 7 days are extracted in a very small amount, and the extraction coating agent content changes little over time, thus showing excellent adhesion.

Test Example 3 Visual Inspection

The coke state was visually evaluated every time the samples of Examples 1 to 6 undergoing the freeze-thawing repetition process according to the method of Test Example 3 three times, seven times, and ten times. As a result of enlarging the surface of the coke, all of the cracks were invisible and maintained in good shape, and no color change was observed.

The coating composition of the present invention was used only for the purpose of coating the solid fossil fuel solids in the present invention, it is also applicable to a variety of other fields, thereby preventing the cracking of the product of various fields and to prevent the water penetration phenomenon. It is expected.

As can be seen from the above, the coating composition according to the present invention is coated on the surface of the solid fossil fuel solids, it is possible to prevent the phenomenon of solid fossil fuel solids cracking by freezing and dissolution at daily temperature changes, rainfall It effectively blocks the penetration of moisture even under water, and has the advantage of being readily available when needed.

Claims (3)

In the surface coating composition of a solid fossil fuel solid, The surface coating composition contains 20 to 35% by weight of rosin, 10 to 20% by weight of sodium hydroxide, 20 to 35% by weight of nonionic surfactant, and the remaining water, The solid fossil fuel solids are added by mixing 3-10 parts by weight of a solidifying agent with respect to 100 parts by weight of one or two or more solid fossil fuels, followed by molding. Manufactured by heating at a temperature, The solidifying agent is 25 to 35% by weight emulsion asphalt, 0.05 to 0.20% by weight emulsifier for asphalt, 0.1 to 0.3% by weight hydrochloric acid, 0.01 to 0.05% by weight calcium chloride, 0.01 to 0.05% by weight oleic acid, cationic or amphoteric A surface coating composition of a solid fossil fuel solid, characterized in that it contains 0.005 to 0.030% by weight of a mixture of surfactants or two or more, and water as a residual amount. The surface coating composition of the solid fossil fuel solid according to claim 1, comprising 24 to 27% by weight of the rosin, 13 to 17% by weight of the sodium hydroxide, 24 to 28% by weight of the nonionic surfactant and water. . delete