JPH0343493A - Production of coke - Google Patents

Abstract

PURPOSE:To increase the packing density of stock coal and to stabilize and improve the quality of coke by mixing coal with a bulk-density improving agent containing a highly water-absorbing resin and a surfactant and using the mixture as a raw material. CONSTITUTION:Coal is mixed with a bulk-density improving agent containing (A) a highly water-absorbing resin capable of absorbing or adsorbing 5-1,000 pts.wt. (preferably 10-1,000 pts.wt.) of distilled water per 1 pt.wt. of the resin and forming a hydrogel and (B) a surfactant (preferably anionic or nonionic surfactant). The obtained mixture is used as a raw material and carbonized to produce coke.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a method for discharging coke, and more specifically,
The present invention relates to a coke manufacturing method that increases the packing density of raw coal in the coke manufacturing process, thereby making it possible to stabilize and improve the quality of coke.

(Prior art) Coke used for blast furnaces is usually made of coking coal of -
Alternatively, it is produced by pulverizing a raw material blend obtained by blending two or more types of raw coal to obtain raw material pulverized coal, which is then charged into a coke oven, heated, and carbonized. At this time, the higher the cubic density of the raw material pulverized coal charged into the coke oven, the more the amount of heat during carbonization can be reduced, and the strength of the resulting coke increases, improving its quality. In other words, by densely packing coking coal powder, higher quality coke can be obtained when the same coking coal is used, and cheaper coking coal can be used to obtain coke of the same quality. It becomes possible.

In general, raw material coal usually contains about 7 to 15% moisture due to penetration of rainwater due to open piles and water sprinkling to prevent dust generation. Due to the influence of this moisture, the packing density of raw coal pulverized coal decreases when it is charged into a coke oven. As a means of high-density packing of raw material pulverized coal, (a) drying the raw material pulverized coal;
(b) Mixing pre-densified briquette coal into powdered raw coal;
The following methods have been adopted. However, the drying method requires a large amount of drying energy and equipment, and also has the problem of generating dust due to drying. On the other hand, the briquette method is economically disadvantageous because it requires large-scale briquette production equipment, and it also causes uneven distribution of briquette coal when it is charged into the coke oven, making it less profitable. There is a problem in that the quality of coke produced varies. As another means of high-density packing of raw material pulverized coal, by impregnating raw material pulverized coal with oil or a surfactant, the adhesion force between coal particles due to moisture in the coal is reduced, and the slippage between the coals is improved. A method has been proposed (Japanese Patent Publication No. 44-10898.
JP 57-49893, JP 61-283885)
, it is necessary to increase the amount of oil added.

Even if the surfactant is added at a certain amount j1 or more, the effect is not always satisfactory, such as there being a limit to the effect.

(Problems to be Solved by the Invention) An object of the present invention is to provide a method for densely filling raw material pulverized coal.

As a result of intensive studies to achieve this objective, the present inventors discovered a method for improving the packing density of raw coal powder by mixing super absorbent resin with raw material powder coal (Japanese Patent Application No. 63-1
49471), and as a result of further research, it was discovered that the packing density of raw coal powder could be further improved by using a superabsorbent resin and a surfactant, or a combination of these and mineral oil.Based on this knowledge, the present invention was developed. I was able to complete it.

(Means for Solving the Problems) Thus, according to the present invention, coke is produced by carbonizing raw coal, and the raw coal has a bulk density containing a super absorbent resin and a surfactant. A method for producing coke is provided, which uses coal mixed with an improver or a bulk density improver containing a superabsorbent resin, a surfactant, and mineral oil.

In the present invention, raw coal is usually in the form of pulverized coal, but may be a mixture of pulverized coal and briquette coal.

What is the superabsorbent resin used in the present invention?

Any resin may be used as long as it has the ability to absorb or adsorb 5 to 1000 times its own weight of distilled water, preferably 10 to 1000 times its own weight, and produce a hydrogel.

The superabsorbent resin that produces the hydrogel used in the present invention includes water-insoluble resins having a physically or chemically three-dimensionally crosslinked polymer network. In these resins, water is absorbed or adsorbed within the polymer network to form a hydrogel.

These water-insoluble resins can be synthesized by known methods, but specific examples include (a) water-soluble polymer compounds (such as starch-acrylonitrile copolymer hydrolysates, polyesters, Acrylonitrile hydrolyzate, polyethylene oxide, #acid vinyl-acrylate copolymer hydrolyzate, #acid vinyl-acrylic acid ester copolymer hydrolyzate, vinyl alcohol-acrylate copolymer, polyacrylate , olefin-maleic anhydride copolymer hydrolyzate, etc.)
(b) Compounds in which a water-insoluble polymer is crosslinked and then hydrolyzed to give a hydrophilic moiety.

In addition, methods for introducing three-dimensional crosslinking include a method of introducing a polar group into a polymer to generate intramolecular or intermolecular hydrogen bonds; a method of using a polyfunctional crosslinking agent during polymer synthesis;
A method of crosslinking between polymers by reaction between functional groups contained in the polymer or by radiation irradiation: A method of introducing a hydrophobic group or a crystal structure into a polymer can be exemplified.

In the present invention, two or more types of organic polymer compounds that produce a hydrogel can be used in combination.

The surfactant used in the present invention is not particularly limited,
Any of anionic surfactants, cationic surfactants, nonionic surfactants, and amphoteric surfactants can be used, but anionic surfactants and nonionic surfactants are particularly preferred.

Specific examples of anionic surfactants include higher fatty acid alkali salts (soaps), N-acylamino acid salts,
Carboxylate salts such as alkyl ether carboxylates and acylated peptides: For example, sulfonate salts such as alkyl sulfone'fi salts, alkylaryl sulfonates, sulfosuccinates, α-olefin sulfonates, and N-acylsulfonates. ; Sulfuric acid ester salts such as sulfated moieties, alkyl sulfates, alkyl ether sulfates, alkylaryl ether sulfates, and alkylamido sulfates: For example, alkyl phosphates, alkyl ether phosphates, alkylaryl ether phosphates, etc. Phosphate ester salts can be mentioned. Also, polyoxyethylene alkyl ether sulfate, polyoxyethylene alkylaryl ether'
Anionic surfactants that can be used in the present invention also include those having nonionic surfactant moieties such as E11 acid salt. Furthermore, examples of the above-mentioned salts include, but are not limited to, sodium salts, potassium salts, ammonium salts, and the like.

Further, specific examples of the nonionic surfactants used in the present invention include, for example, alkyl polyoxyethylene ether, alkylaryl polyoxyethylene ether,
Ether type nonionic surfactants such as alkylaryl formaldehyde condensed polyoxyethylene ether and block polymers having polyoxypropylene as a lipophilic group; for example, polyoxyethylene ether of glycerin ester, polyoxyethylene ether of sorbitan ester,
Ether ester type nonionic surfactants such as polyoxyethylene ether of sorbitol ester; Ester type nonionic surfactants such as polyethylene glycol fatty acid ester, glycerin ester, sorbitan ester, propylene glycol ester, sucrose ester; For example, fatty acid alkanolamide acid Examples include nitrogen-containing nonionic surfactants such as amide, polyoxyethylene fatty acid amide, polyoxyethylene alkylamine, and amine oxide.

Furthermore, specific examples of the cationic surfactants used in the present invention include higher aliphatic primary amine salts, higher aliphatic tertiary amine salts, higher aliphatic tertiary amine salts, ester-bonded amines, amide Examples include bonded amines, ether bonded amines, ado bonded pyridium salts, ester bonded pyridium salts, ether bonded pyridium salts, and quaternary ammonium salts.

In the present invention, one type of surfactant may be used alone, or two or more types may be used in combination.

The mineral oil used in the present invention is not particularly IIJIW, and specific examples include kerosene, light oil, A heavy oil, B heavy oil, C
Heavy oil, waste oil and lubricating oil can be indicated.

In the bulk density improver used in the present invention, the weight ratio of the surfactant to the total weight of the super absorbent m fat and the surfactant is 80% or less. When the weight ratio of the surfactant exceeds this range, the synergistic effect on bulk density improvement due to the combined use of both components becomes small.

In the present invention, when the three components of a superabsorbent resin, a surfactant, and mineral oil are used together as a bulk density improver, the total weight of the surfactant and mineral oil is 9% of the total weight of the superabsorbent resin and the superabsorbent resin.
It is desirable to set it to 0% or less, preferably 85% or less, in order to obtain a synergistic bulk density improvement effect.

At this time, the ratio of surfactant to mineral oil is not particularly limited, but the larger the ratio of mineral oil is, the more economically advantageous it is.

The amount of the bulk density improver containing a superabsorbent resin and a surfactant (and further mineral oil) used in the present invention to be mixed with raw coal is 0 per dry weight of raw coal, although it depends on the properties of raw coal. It is .01% or more. Although there is no particular upper limit to the amount used, it is usually 5% by weight from the viewpoint of increasing the cost of raw materials and saturating the effect if the amount used is too large.

In the present invention, the form in which the bulk density improver is added to the raw coal is not particularly limited, and may be in any of the following forms: powder, gelled with a small amount of water, dissolved or dispersed in a solvent, and other forms. It may be in the form of

Further, each component of the bulk density improver used in the present invention may be mixed separately into raw coal, or any two or more components may be mixed in advance and then mixed into raw coal. Good too.

Furthermore, in the present invention, the timing of adding the bulk density improver to raw coal is not particularly limited, and can be added during the coke manufacturing process (for example, the process of crushing raw coal, transferring process, charging process to coke oven, etc.). It can be added in the above steps.

Furthermore, the bulk density improver used in the present invention may contain a solvent or the like as long as it does not impair the effects of the present invention.

(Effects of the Invention JJ) Thus, according to the present invention, the packing density of coking coal charged into a coke oven can be improved compared to the conventional technology 7, and thereby the quality of coke can be stabilized and improved. .

(Example) The present invention will be explained in more detail with reference to Examples below.

In addition, parts and percentages in the examples are as follows, unless otherwise specified.
It is based on weight. Further, in Table 6 in this example, the amount of the bulk density improver added is expressed as a weight percentage with respect to the raw coal.

Example 1 Grinded with a grinder, the content of particles of 3+nn+ or less is 80
% cross-linked polyacrylic m salt (Acripop OH~2 Nippon Shokubai Kagaku Co., Ltd.) as a super absorbent resin (hereinafter sometimes referred to as component A) and / or surfactant (hereinafter referred to as Bfi
There is a thing called minutes. ) as lauryl sulfate (anionic surfactant: Emar 2F = Kao Corporation fJB) at the ratio shown in Table 1, total 1 g (0.2% based on powdered coal).
The mixture was added and stirred for 3 minutes using a Hobart mixer.

To determine the bulk density of coal, put the obtained mixture of coal and bulk density improver into a 500-meter measuring cylinder, and use a vibrator to measure the bulk density of the coal.
After applying vibration to this graduated cylinder for 30 seconds using a measuring cylinder, measure the volume and weight of the mixture in the graduated cylinder,
It was determined by dividing the weight (kg) by the volume (Q).

The results obtained are shown in Table 1.

When the bulk density of coal without a bulk density improver was measured using the same method, it was 0.702. The bulk density improvement rate was obtained by dividing the bulk density of the coal to which the bulk density improver was added by this value. The results are shown in Table 6. From the results in Table 6, when using coal mixed with a bulk density improver containing a superabsorbent resin and a surfactant in the ratio specified in the present invention, the bulk density It can be seen that the packing density is significantly higher than that of coal that is not mixed with an improver.

[Left below] Example 2 As component A, starch-polyacrylic acid graft copolymer (Sunwet IM100O: manufactured by Sanyo Chemical Co., Ltd.) or isobutylene-maleic anhydride copolymer salt crosslinked product (KI
Gel 201: The same experiment as in Example 1 was conducted except that Gel 201 manufactured by Kuraray Co., Ltd. was used, and the results obtained are shown in Table 3.

From the results in Table 3, it can be seen that a good bulk density improvement effect can be obtained even if the type of superabsorbent resin is changed.

[Space below] Example 3 Component B is sodium dialkyl sulfosuccinate (anionic surfactant: Perenx OTP: manufactured by Kao Corporation) or polyoxyethylene oxypropylene (nonionic surfactant: Emulgen PP-23゛O: Kao Corporation) The same experiment as in Example 1 was conducted except that the method was changed to (Company vJ). The results obtained are shown in Table 3.

From the results in Table 3, it can be seen that a good bulk density improvement effect can be obtained even if the type of surfactant is changed.

[Margin below] Example 4 An experiment similar to Example 1 was conducted except that the amount of the bulk density improver was changed as shown in Table 4. The results obtained are shown in Table 4.

[Example 5: Cross-linked polyacrylate (Acrihope GH-2), lauryl sulfate (anionic surfactant: Emar 2F) and mineral oil (hereinafter sometimes referred to as "C") in the ratios shown in Table 5. The same experiment as in the example above was conducted except that a bulk density improver consisting of B heavy oil as .) was used. The results are shown in Table 5.

From the results in Table 5, when using coal mixed with a bulk density improver containing a superabsorbent resin, surfactant, and mineral oil in the ratio specified in the present invention, the packing density of coal becomes significantly higher. I understand that.

[Left below: Example 6 Example 5 except that the super absorbent resin was changed to isobutylene-maleic anhydride copolymer salt crosslinked product (Kl Gel 201K)
Table 6 shows the results obtained by conducting a similar experiment.

From the results in Table 8, it can be seen that a good bulk density improvement effect can be obtained even if the type of superabsorbent resin is changed.

[Margin below] Example 7 An experiment similar to Example 5 was conducted except that the amount of the bulk density improver was changed as shown in Table 7. The results obtained are shown in Table 7.

Example 8 An experiment similar to Example 5 was conducted except that the mineral oils shown in Table 8 were used. The results obtained are shown in Table 8.

[Margin below]

Claims (2)

[Claims] (1) A method for producing coke, characterized in that in producing coke by carbonizing raw coal, coal mixed with a bulk density improver containing a superabsorbent resin and a surfactant is used as raw coal. . (2) The method for producing coke according to claim (1), wherein the bulk density improver further contains mineral oil.