KR100432043B1 - Anti gel fromation chemical used at slag granulator of blast furnace - Google Patents

Abstract

The present invention relates to a gel flocculation inhibitor and a prevention method of the blast furnace refurbishment manufacturing apparatus, and in particular, gel coagulation which suppresses the formation of gel generated when caustic soda is added to the circulating cooling water to remove hydrogen sulfide generated in the blast furnace refurbishment manufacturing apparatus. It relates to an inhibitor.

In addition, the present invention provides a constant amount of circulating cooling water (a) carboxy methyl cellulose (CMC); (b) hydroxy ethane-1,1-diphosphonic acid (HEDP); And (c) adding sodium dodecyl sulfate (SDS) to a predetermined weight.

The anti-gel coagulation agent of the present invention not only prevents the dehydration performance of the dehydration tank separating the water and the circulating cooling water by inhibiting gel formation generated by adding caustic soda to the circulating cooling water to remove hydrogen sulfide discharged from the water producing apparatus. Rather, it is effective in descaling the circulation cooling water pipe.

Description

Anti-gel coagulation agent of blast furnace material manufacturing apparatus {ANTI GEL FROMATION CHEMICAL USED AT SLAG GRANULATOR OF BLAST FURNACE}

[Industrial use]

The present invention relates to a gel flocculation inhibitor and a prevention method of the blast furnace refurbishment manufacturing apparatus, and in particular, gel coagulation which suppresses the formation of gel generated when caustic soda is added to the circulating cooling water to remove hydrogen sulfide generated in the blast furnace refurbishment manufacturing apparatus. An inhibitor and a method for preventing gel aggregation.

[Prior art]

Slag, which is a by-product of the production of pig iron in blast furnaces, is now aggregated in a dry pit or slag sand in a sewage plant. The produced water and the circulating coolant are held in the lower part of the stirring tank, and then sent to the dehydration tank by the slurry pump to be separated into the water and water, where the separated water is aqueous and reused by the truck and the water is cooled in the cooling tower and recycled. .

When the molten slag is quenched by circulating cooling water in this way, the sulfur content of the slag comes into contact with water to generate hydrogen sulfide, which must be removed because it is highly corrosive and generates a strong odor.

In removing the hydrogen sulfide thus generated, hydrogen sulfide, which is highly corrosive and causes odors, can be selectively and efficiently removed through reaction with caustic soda, ie NaOH, in the circulating cooling water. A device is disclosed in Korean Patent Application No. 10-1999-0060908.

However, in general, when the pH of the circulating cooling water is increased (basic aqueous solution), poorly soluble gels are produced, and thus, there is a problem of dehydration due to these poorly soluble gels. There is this.

In addition, dispersants such as anti-agglomerates have a lot of low-boiling volatile components, there is a problem in that the performance of the dispersant itself is not exhibited when the temperature of the circulating cooling water to be treated as in the blast furnace remanufacturer is high.

The present invention has been made in view of the problems of the prior art, by reducing the dehydration performance of the dehydration tank by suppressing the formation of gel generated when caustic soda is added to the circulating cooling water to remove hydrogen sulfide generated in the blast furnace remanufacturer In addition to preventing, it is an object of the present invention to provide an antigelling agent effective for descaling in the circulation cooling water pipe.

In addition, another object of the present invention is not only to effectively prevent gel agglomeration in order to prevent the dehydration performance of the dehydration tank separating the circulating cooling water of the blast furnace material manufacturing apparatus, but also to prevent the gel agglomeration in the circulating cooling water pipe to effectively remove the scale To provide.

[Means for solving the problem]

The present invention provides a gel aggregation inhibitor composition to be added to the circulating cooling water of the blast furnace material manufacturing apparatus in order to achieve the above object,

(a) carboxyl methyl cellulose (CMC);

(b) hydroxy ethane-1,1-diphosphonic acid (HEDP); And

(c) sodium dodecyl sulfate (SDS)

It provides a gel aggregation inhibitor comprising a.

The present invention also provides a method for preventing gel agglomeration of circulating cooling water in a blast furnace refurbishment apparatus, the method comprising adding a composition comprising carboxy methyl cellulose, HEDP, and sodium dodecyl sulfate to the circulating cooling water.

Hereinafter, the present invention will be described in detail.

[Action]

When caustic soda is administered to the circulating cooling water to remove hydrogen sulfide from the blast furnace, the poorly soluble gel such as CaCO ₃ is generated in the circulating cooling water due to the increase of the pH of the circulating cooling water. Reduces the dehydration performance of the bath.

The poorly soluble gels do not precipitate when the pH of the circulating cooling water is 9 or less, but easily precipitates when the pH of the circulating cooling water is 10 or more after the addition of caustic soda.

In order to solve the above problems, the present invention suppresses the aggregation of poorly soluble gels such as CaCO ₃ produced by increasing the pH of the circulating cooling water when caustic soda is administered to the circulating cooling water to remove hydrogen sulfide generated in the blast furnace remanufacturer To provide a gel aggregation inhibitor containing carboxy methyl cellulose, HEDP, and sodium dodecyl sulfate, and a method of prevention.

In addition, the present invention provides a circulating cooling water by administering the gel anti-agglomerating agent of the present invention to the circulating cooling water in order to prevent precipitation of poorly soluble salts dissolved in the circulating cooling water even at a pH of 10 or more in the initial operating conditions of the pH of the circulation cooling water is 9 or less. The poorly soluble salt components in water are dispersed completely so as not to aggregate with each other. As described above, the salts dispersed in each other are added with caustic soda to circulating cooling water so as not to aggregate with each other even when the pH is increased.

By using the dispersing ability of the gel coagulant of the present invention, it has an effect of suppressing scale generation adhering to the wall surface on which the circulating cooling water is introduced.

The present invention is a gel aggregation inhibitor composition to be added to the circulating cooling water of the blast furnace material manufacturing apparatus,

(a) 400 to 800 parts by weight of carboxy methyl cellulose (CMC);

(b) 6 to 10 parts by weight of HEDP; And

(c) 6 to 10 parts by weight sodium dodecyl sulfate (SDS)

It adds in the composition ratio of the, and prepares the gel aggregation inhibitor composition.

In the composition of the gel aggregation inhibitor of the present invention, the carboxy methyl cellulose of (a) is preferably used at 800 to 1600 ppm per 1 L of circulating cooling water. If the weight of the carboxy methyl cellulose is less than 800 ppm, there is little dispersion effect, if the weight of the carboxy methyl cellulose exceeds 1600 ppm, due to the excess, the carboxy methyl cellulose itself is aggregated in the circulating cooling water.

In addition, the HEDP of (b) is preferably used at 12 to 20 ppm per 1 L of circulating cooling water. If the weight of HEDP is less than 12 ppm, poorly soluble salts that cannot dissolve HEDP appear as a thin film. If the weight of HEDP exceeds 20 ppm, the amount of NaOH increases with increasing concentration of HEDP. There is a problem.

It is preferable to use the sodium dodecyl sulfate of (c) at 12-20 ppm per 1 L of circulating cooling water. When the weight of sodium dodecyl sulfate is less than 12 ppm, there is no difference from carboxy methyl cellulose alone, but when used at more than 12 ppm, small gels do not form floating in circulating cooling water. In addition, as the weight of sodium dodecyl sulfate increases, the amount of scale gradually decreases after a predetermined time on the wall of the experiment vessel, but when the amount exceeds 20 ppm, the amount of scale rarely decreases.

Gel agglomeration inhibitor of the present invention having the composition as described above to dehydrate the dehydration tank separating the water and the circulating cooling water by inhibiting the gel formation caused by the input of caustic soda to the circulating cooling water to remove the hydrogen sulfide discharged from the water production apparatus The performance degradation can be prevented.

In addition, the anti-gel coagulation agent of the present invention is excellent in the dispersibility, there is an effect of suppressing the generation of scale (stick) attached to the pipe wall surface for introducing the circulation cooling water.

Hereinafter, preferred examples are provided to aid in understanding the present invention. However, the following examples are only one preferred embodiment provided to more easily understand the present invention, and the present invention is not limited to the following examples.

EXAMPLE

Example 1

To 1 L of circulating cooling water, the concentrations of carboxy methyl cellulose (CMC) were administered at 0, 200, 400, 600, 800, 1000, 1200, 1400, 1600, 1800, and 2000 ppm, respectively. After the addition, the mixture was thoroughly stirred, and then 0.5 N-NaOH was added thereto to adjust the pH of the circulating cooling water to 11.5, and the results are shown in Table 1 below.

Circulating coolant CMC 0.5 N-NaOH Gel Creation Remarks 1 L 0 ppm 12.0 mL U Generate large amounts of gel 200 ppm 12.0 mL U 400 ppm 12.0 mL U 600 ppm 11.8 mL U 800 ppm 11.8 mL U Relatively small particles precipitate 1000 ppm 11.8 mL U 1200 ppm 11.6 mL U 1400 ppm 11.6 mL U 1600 ppm 11.4 mL U 1800 ppm 11.4 mL U Gel particles become somewhat larger 2000 ppm 11.2 mL U

As shown in Table 1, when the concentration of carboxy methyl cellulose is 800 ~ 1600 ppm it was confirmed that the effect on the gel formation.

Example 2

The concentrations of HEDP were administered at 2, 4, 6, 8, 10, 12, 14, 16, 18, and 20 ppm, respectively, in 1 L of circulating cooling water. After the administration, the mixture was thoroughly stirred, and 0.5 N-NaOH was added thereto to adjust the pH of the circulating cooling water to 11.5, and the results are shown in Table 2 below.

Circulating coolant HEDP 0.5 N-NaOH Gel Formation Remarks 1 L 2 ppm 50.0 mL radish Thin film on circulating coolant surface 4 ppm 60.0 mL radish 6 ppm 70.0 mL radish 8 ppm 90.0 mL radish 10 ppm 100.0 mL radish 12 ppm 110.0 mL radish 14 ppm 118.0 mL radish 16 ppm 118.0 mL radish 18 ppm 120.0 mL radish 20 ppm 125.0 mL radish

As shown in Table 2 above, as a result of adding the HEDP, no gel was formed at each concentration, but it was found that the amount of caustic soda added was much higher than the result shown in Example 1 above. Therefore, although HEDP has an excellent effect on inhibiting gel precipitation, it was found that the consumption of caustic soda is extremely high and HEDP alone cannot be used.

Example 3

Sodium dodecyl sulfate (SDS) 2, 4, 6, 8, 10, 12, 14, 16, 18, which are representative anionic surfactants to further increase the dispersibility according to carboxy methyl cellulose (CMC) in Example 1 And 20 ppm, respectively, to the circulating cooling water to be thoroughly stirred, and then 0.5 N-NaOH was added to adjust the pH of the circulating cooling water to 11.5 and the results are shown in Table 3 below.

Circulating coolant CMC SDS 0.5 N-NaOH Gel Formation Remarks 1 L 200 ppm 2 ppm 12.0 mL U Short time to gel 400 ppm 4 ppm 12.0 mL U 600 ppm 6 ppm 11.8 mL U 800 ppm 8 ppm 11.8 mL No → 1000 ppm 10 ppm 11.8 mL No → Over time, relatively small gels are produced and scales are formed on the walls of the chamber. 1200 ppm 12 ppm 11.6 mL No → 1400 ppm 14 ppm 11.6 mL No → 1600 ppm 16 ppm 11.4 mL No → 1800 ppm 18 ppm 11.4 mL No → 2000 ppm 20 ppm 11.2 mL No →

As shown in Table 3, it was confirmed that the dispersibility of the gel was improved when the sodium dodecyl sulfate as an anionic surfactant was improved, but very fine gels adhered to the wall of the experimental container to form scale.

Example 4

Carboxymethyl cellulose (CMC), HEDP, and sodium dodecyl sulfate (SDS) mentioned in Example 2, and Example 3 above were administered to circulating cooling water in a composition as shown in Table 4 below, followed by complete stirring. 0.5 N-NaOH was added thereto to adjust the pH of the circulating cooling water to 11.5, and the results are shown in Table 4 below.

Circulating coolant CMC HEDP SDS 0.5 N-NaOH Gel Formation 1 L 200 ppm 2 ppm 2 ppm 12.0 mL radish 400 ppm 4 ppm 4 ppm 12.0 mL radish 600 ppm 6 ppm 6 ppm 12.4 mL radish 800 ppm 8 ppm 8 ppm 12.4 mL radish 1000 ppm 10 ppm 10 ppm 12.6 mL radish 1200 ppm 12 ppm 12 ppm 12.6 mL radish 1400 ppm 14 ppm 14 ppm 13.0 mL radish 1600 ppm 16 ppm 16 ppm 13.4 mL radish 1800 ppm 18 ppm 18 ppm 13.4 mL radish 2000 ppm 20 ppm 20 ppm 13.8 mL radish

As shown in Table 4, it was confirmed that the poorly soluble gels were completely dispersed, and some of them were dissolved in HEDP, so that the gel did not precipitate. In addition, it was found that the concentration of each component is preferably 800 to 1600 ppm of carboxy methyl cellulose, 12 to 20 ppm of HEDP, and 12 to 20 ppm of sodium dodecyl sulfate.

Example 5

Compositions of Carboxymethyl Cellulose (CMC), HEDP, and Sodium Dodecyl Sulfate (SDS) measured in Example 4 above, ie, Carboxymethyl Cellulose 800-1600 ppm, HEDP 12-20 ppm, and Sodium Dodecyl Sulfate 12-20 The effect of the anti-agglomeration agent of this invention in the state heated up to 80 degreeC instead of circulating cooling water of ppm at room temperature was measured, and the result is shown in Table 5 below.

Circulating coolant Circulating coolant temperature CMC HEDP SDS 0.5 N-NaOH Gel Formation 1 L Room temperature 800 ppm 12 ppm 12 ppm 12.4 mL radish 1000 ppm 14 ppm 14 ppm 12.6 mL radish 1200 ppm 16 ppm 16 ppm 12.6 mL radish 1400 ppm 18 ppm 18 ppm 13.0 mL radish 1600 ppm 20 ppm 20 ppm 13.4 mL radish 80 ℃ 800 ppm 12 ppm 12 ppm 14.6 mL radish 1000 ppm 14 ppm 14 ppm 15.0 mL radish 1200 ppm 16 ppm 16 ppm 16.0 mL radish 1400 ppm 18 ppm 18 ppm 16.6 mL radish 1600 ppm 20 ppm 20 ppm 17.0 mL radish

As shown in Table 5, the anti-agglomeration agent of the present invention was confirmed to be stable to the temperature by confirming that it inhibits the gel formation not only at room temperature but also at a temperature of 80 ℃.

The anti-gel coagulation agent of the present invention can prevent the dehydration performance of the dehydration tank separating the water and the circulating cooling water by inhibiting the gel formation generated as a result of adding caustic soda to the circulating cooling water to remove the hydrogen sulfide discharged from the water production apparatus. In addition, it is effective in descaling the circulation cooling water pipe.

Claims (4)

In the gel blast preventing agent composition added to the circulating cooling water of the blast furnace refurbishment manufacturing device (a) carboxyl methyl cellulose (CMC); (b) hydroxy ethane-1,1-diphosphonic acid (HEDP); And (c) sodium dodecyl sulfate (SDS) Gel aggregation inhibitor composition comprising a. The method of claim 1, (a) 400 to 800 parts by weight of carboxy methyl cellulose; (b) 6 to 10 parts by weight of HEDP; And (c) 6 to 10 parts by weight sodium dodecyl sulfate Gel aggregation inhibitor composition comprising a. 3. The gel coagulant composition of claim 2, wherein the gel coagulant composition comprises 800 to 1600 ppm of carboxy methyl cellulose, 12 to 20 ppm of HEDP, and 12 to 20 ppm of sodium dodecyl sulfate per 1 L of circulating cooling water. . A method for preventing gel agglomeration of circulating cooling water in a blast furnace refurbishing apparatus, the method comprising the step of adding a gel aggregation inhibitor composition of claim 1 to the circulating cooling water.