JPS591595A - Viscosity depressant for highly concentrated coal/water slurry - Google Patents

Abstract

PURPOSE:To provide the titled depressant consisting mainly of polyether or linked polyether compd. and containing phosphoric ester or salt thereof as an auxiliary, which has an excellent viscosity reducing effect and improves fluidity and stability of a highly concentrated coal/water slurry. CONSTITUTION:The viscosity depressant is prepared by blending (A) 50-95wt% polyether compd. having a molecular weight of 6,000-600,000 and (B) 50-5wt% phosphate of polyhydric alcohol or salt thereof. The polyether compd. is obtained by adding alkylene oxide to a compd. having at least one, pref. at least three and most pref. at least five active hydrogen atoms in one molecule and the linked polyether compd. is obtained by linking at least two molecules of the polyether compd. by use of a linking agent (e.g. containing ethylene oxide in an amount of 10-100wt% of the total alkylene oxide).

Description

[Detailed description of the invention] The present invention relates to a coal-boss-free thinning agent.

In recent years, due to the depletion of petroleum resources, the use of lime has been reaffirmed,
Its usage is currently under consideration. However, unlike oil, coal is a solid substance and cannot be transported by pump. Therefore, various methods are being considered to make coal powder-free and disperse it in water to make it boss-free. However, with current technology, this method becomes difficult to pump as the lime concentration increases significantly, resulting in a marked increase in viscosity and loss of fluidity.

On the other hand, lowering the lime concentration reduces transport efficiency and requires a dehydration step before combustion, which is expensive and impractical.

In order to improve the above-mentioned drawbacks, there is a technique of using anionic surfactants, such as 2-ethylhexyl reboridic acid ester, as a dispersant in lime-wood slurries.

However, using this alone has no effect at all, and it is difficult to increase the concentration.

In order to improve the above-mentioned drawbacks, the present inventors have already developed a polyether compound or a bonded polyether compound with a high
We discovered that it has an excellent effect as a thinning agent for wood sopfree, and we are currently applying for a patent, but we believe that it may be possible to obtain a water slurry thinner with even better concentration. As a result of consideration, we found that compounds containing polyether compounds or bonded polyether compounds as a main ingredient and phosphoric acid ester compounds or phosphoric acid ester compounds as auxiliary agents are the most effective for high-concentration coal.
The inventors have discovered that it exhibits excellent effects as a viscosity reducing agent for water slurries, and have come to provide the present invention. That is, it is a high IM coal-water nufree water thinning agent used to reduce the viscosity of lime-bonurary and improve fluidity and stability, [a] one or more active hydrogen atoms in the molecule, preferably 3 or more, more preferably, < is a polyether compound obtained by adding an alkylene oxide to a compound having 5 or more, or a bonded polyether compound in which two or more molecules of the above polyether compound are bonded with a binder, and a polyether compound Or the molecular weight of the bonded polyether compound is 6. (100~
600,000, preferably 10,000 to 300,000, and rb] a polyvalent polyhydric alcoholic acid ester or a salt thereof.
It is an I5 agent.

5. Coal used in the lime-wood slurry of the present invention includes smokeless coal, pure blue coal, i1t+bituminous coal, lignite, and cleaned L5 versions of these coals, but any coal may be used. good. In addition, the lime particle size in boss-free may be any particle size as long as it is powder, but since the fine powder currently burned in thermal power plants is 200 meters:L 70% by weight or more, this particle size is suitable. is a guideline for the particle size of Hui Powder. However, the thinner of the present invention is not affected by particle size and exhibits excellent effects on coal powder of any particle size.

Cleaned coal is lime from which minerals such as ash and sulfur have been removed. Examples of methods for cleaning coal include Oil, Agglom
eration law (hereinafter referred to as OA law), floating election method,
Examples include heavy liquid separation methods. However, methods other than these may also be used and are not particularly limited.

Regarding the OA method, after pulverizing coal in a dry or wet method, the water nurary is adjusted, and if necessary, an appropriate amount of oil with a surfactant added is added, or the coal is coated with the above oil in advance. After that, the water slurry is adjusted and stirred to take advantage of the difference in wettability of the organic and inorganic components of the coal to oil and water, and selectively wet the organic components of the coal. cause agglomeration. On the other hand, since inorganic substances have a weak affinity with oil and are liberated in water, this method allows the inorganic substances to be removed at the same time by separating the aggregated lime from water. Liming 111 in the lime-water slurry of the OA process is usually 10-65% by weight.

Various fractions obtained from crude oil or crude oil used in the OA method, such as kerosene, light oil, A heavy oil, B heavy oil, C
These include heavy oil, tar A/shale oil, ethylene decomposition residual oil, and various blended oils, oils commonly used as fuel, and mineral oils such as lubricating oils and cleaning oils. Water-insoluble oils such as distilled benzene, t/l/ene, xylene, and animal and vegetable oils may also be used, but among these, heavy oils such as C heavy oil and Turf S/residue oil are particularly preferred because they are inexpensive. It is generally sufficient for this oil to be used in an amount of 30% by weight or less based on the coal in the rehydrated solute to be treated for mineral removal.

In addition, the flotation method is an existing coal washing method in which a very small amount of oil is added to the starch-water souffle and stirred to create foam.
Generate floss. Similar to the OA method, in this method, the organic components of the coal adhere to the froth oil film, but the inorganic components are liberated in the water.
This is a method that can separate coal organic components.

The oils used in the flotation method are terpine oil M, tar, heavy oil, C heavy oil, light oil, and kerosene.

Generally, the above method removes inorganic substances of several tens of percent by weight or more from coal.

If lime cleaned in this manner is used, the effect of the additive of the present invention will be significantly greater than that of coal that has not been cleaned. <Excellent, and it is possible to obtain a coal-water slurry with several points higher concentration. When using cleaned coal, in addition to this effect, boiler corrosion during combustion is suppressed, and the burden on ash removal equipment and desulfurization equipment is reduced.

-9= Next, the thinner used in the coal-water slurry of the present invention is [a] a polyether compound in which an alkylene oxide is added to a compound containing one or more active wood molecules in the molecule, or the above-mentioned A bonded polyether IV compound in which two or more molecules of a polyether compound are bonded together using a binder, and the molecular weight of the bonded polyether compound that spans the polyether compound is 6,000 or more.
600,000, and [b] one in which a phosphoric acid ester of a polyhydric alcoco or its ester is combined with an essential ingredient in 1 to 1.

-10- In the Ca] component, examples of compounds having one or more active hydrogens in the molecule include alcohols, amines, carboxylic acids, polyalkyleneimines, and aromatic compounds rich in pheno-7 and erotic hydrogen. or its aliphatic
Examples include redehyde metal shrinkage products.

As alcohols, those containing one active hydrogen,
For example, octyl alcohol, cyclohexyl M alcohol with 1 benzyl alcohol, 2 active hydrogen atoms, such as ethylene glycol, polyethylene glycol, propylene imine-V, polypropylene glycol, butylene glycol, polybutylene glycol, butanediol, pentanediol, etc. - Containing 3 active hydrogens such as M1 hexanediol, e.g. glycerin,
butanetriol, hexanetriol-7L/), limethylolpropane, triethanolamine, etc., containing 4 active hydrogens, such as diglycerin, pentaerythritol, nVbit, etc. containing 5 or more active hydrogens, such as xylide -7, Levitol, glucose, sucrose, partially saponified polyvinyl acetate, partially saponified polyvinyl acetate copolymer, cellulose, starch, etc., and alcohols rich in two or more active hydrogens. Derivatives such as partial ester M compounds containing one or more active hydrogens are also included.

Examples of amines include those containing one active hydrogen, such as ethyl methamine, N-methyl oleuryl amine, etc.
Those containing active hydrogen 2@, such as methylamine, ethylamine, propylamine, butylamine, aryl V amine, amine M amine, octylamine, decylamine,
Lauryl leamine, tetradecifuramine, pentadecifuramine, octadecylamine, tallow alkylamine, coconut alkyl V amine, aniline, P-toluidine, m
-Toluidine, nitroaniline, benjaamine, chronoleaniline, P-dodecyV benzylamine, cyclohexine flareminato, those containing 3 active hydrogens, such as ammonia, tallow propylene diamine, etc., containing 4 active hydrogens to substances containing 5 or more active hydrogens, such as ethylenediamine, tetramethylenediamine, hexamethylenediamine, phenylenediamine, benzidine, cyclohegycyldiamine, etc., such as diethylenetriamine, triethylenetetramine, tetraethylenepentamine, and pentaethylene. Examples include xazine, and various derivatives such as partial amides of amines containing two or more active hydrogens, which also contain one or more active hydrogens.

Examples of M-ponic acids include those containing one active hydrogen;
For example, acetic acid, octy-V acid, lauric acid, stearic acid,
Rest in peace, Olay 7 acid! Acids, such as P-nitrobenzoic acid, and those containing two active hydrogen atoms, such as schikolic acid, malonic acid, phthalic acid, maleic acid, adipic acid, azelaic acid, cepatic acid, dodecanniic acid, dimer acid,
Those containing 3 active hydrogens such as 0-phenylenediacetic acid, such as hemimellitic acid and trimellitic acid, and those containing 4 active hydrogens such as butanetetracarboxylic acid, pyromellitic acid, ethylenediaminetetraacetic acid, etc. Those containing 5 or more active hydrogen atoms, such as acrylic acid polymers, acrylic acid copolymers, methacrylic acid polymers,
Methacrylic acid copolymers, maleic anhydride #li polymers, maleic anhydride copolymers, partially saponified products of acrylic acid polymer V and methacrylic acid ester polymers and copolymers, and anhydrides of the above acids. and acid hafides.

Examples of polyalkyleneimines include polyethyleneimine, polypropyleneimine, and addition polymerization of ethyleneimine and propyleneimine to those containing one or more active hydrogen atoms, such as alcohol-Ms, phenols, amines, and carboxylic acids. Examples include those obtained by amithrisis or amithrisis of dihalogenoalkane.

Furthermore, various derivatives obtained from Boria I lekyleneimine, which have excellent chemical reactivity like ordinary amines, are also mentioned. Representative examples of various derivatives are shown below.

ta+ Reaction products with aldehydes and ketones.

Reaction products with mountain alkyl-7 rehalides, tel incyanates, and thioincyanates.

fdl　A reaction product with something that has an active double bond.

te+ Epoxy compound, reaction product with epihalohydrin.

(Reaction products with Russia cyakamides, guanidines, urea, etc.)

(gl Reaction products with carboxylic acids, acid anhydrides, acyl hafides, etc.

Examples of the aromatic compound containing a pheno-M active group or its aliphatic Vdehyde condensate include tll fe/-/l/, cresol, xyleno-I
and butylpheno-M1] diMpheno-M1 Phenols and substituted phenols such as aminophenol and hydroxybenzoic acid, naphtho-M and substituted naphtho-V such as 12+ naphthol, methi-M naphthol, butylnaphthol, and octylnaphthol. , (3) Polyvalent pheno-M such as catechol, resorcinol, hyrogallol, (4) Polyvalent naphtho-ρ such as naphthresolun, α-naphthohydroquinone, (5) Condensation of bispheno-A/A, bisphenol 8, etc. Pheno-M class, or the above (sword, (2), (3), (4) and (5)
Examples include those made by condensing an aromatic compound containing phenolic active hydrogen with an aliphatic aldehyde.

Examples of aliphatic aldehydes include follemarin, acedoate dehyde, and glyoxal, with formalin being the most common.

When condensing an aliphatic aldehyde, an aromatic compound containing a phenolic active hydrogen and an aliphatic 7 yv tehyde may be condensed first, and then an alkylene oxide may be added to the aromatic compound containing a phenolic active hydrogen. The alkylene oxide may be added first and then the aliphatic Vdehyde may be condensed, but the former is common, but is not limited to a specific method.
Any method can be used as long as the desired polyether compound can be obtained.

Examples of compounds having one or more active hydrogens in the molecule include those mentioned above, and the number of active hydrogens contained is preferably 3 or more, more preferably 5 or more.

When a compound containing a large number of active hydrogens is used, a compound with a complex three-dimensional structure can be obtained by addition of an alkylene oxide, so that even more excellent effects are exhibited.

Examples of the alkylene oxide to be added to a compound having one or more active hydrogen units in the molecule include ethylene oxide, propylene oxide, and butylene oxide, each of which may be added singly or in combination. When two or more types are added, the sequence of -17= may be a block copolymer, a random copolymer, or whichever one is added first. It is more preferable to carry out polymerization.

7A/Kylene oxide has at least ethylene oxide, and the content of ethylene oxide is 10 to 100% by weight of the total alkylene oxide, preferably: 50 to 95
It is a weighted percentage.

The polyether compound is a polyether compound in which an alkylene oxide is added to a compound having one or more active hydrogen atoms in the molecule according to a known method, and the molecular force is 6. (10,000 to 600,000, preferably 10,000 to 300,000).

Examples of the binder for the polyether compound include polyvalent incyanate compounds, polyvalent epoxy compounds, polyvalent levonic acid or polyvalent carboxylic acid derivatives, peroxides (fusical generating catalysts), formalin, and the like. Examples of polyvalent incyanate compounds include hexamethylene diincyanate, ) lylene diincyanate, and xylene diincyanate.
18 = Na), 1.5 naphthylene diincyanate, 4. Examples of polyhydric compounds include idiphenylmethane diincyanate, diglycidyl phenol A1, diglycidyl ethylene glycol, diglycidyl tetraoxyethylene glycol, and the like.

Examples of polyvalent carboxylic acids or polyvalent carboxylic acid derivatives include carboxylic acids containing two active hydrogen atoms, such as t-keshicholic acid, malonic acid, phthalic acid, maleic acid, glutaric acid, adipic acid, azephinic acid, cepatic acid, dodecanniic acid,
Dimer acid, 〇-phenylenediacetic acid, etc., carbonic acids containing 3 active hydrogens, such as hemimellitic acid, trimellitic acid, carboxylic acids containing 4 active hydrogens, such as butanetetocarboxylic acid, pyromellitic acid, ethylenediamine tetracarboxylic acid, etc. Hydrogen acid having 5 or more active hydrogens, such as acetic acid,
For example, acrylic acid polymer, acrylic acid copolymer, methacrylic 1/acid polymer, methacrylic acid copolymer, maleic anhydride polymer, maleic anhydride copolymer, acrylic acid ester and ℃ methacrylic Partially saponified products of polymers and copolymers of acid entel, etc. f1 Examples include anhydrides and acid hafides of the above acids.

Peroxides (radical generation catalysts) include hydrogen peroxide,
Examples include Pency M peroxide (benzoyl peroxide), di-tert-butyl peroxide, Kinmember oxide, and Dicumi ν peroxide.

Also effective are those obtained by reacting and bonding phoremarin under acidic conditions.

When bonding is performed using a polyvalent incyanate compound (f) or a polyepoxy compound as a binder, the proportion of the binder used is arbitrary, but generally speaking, the proportion of the binder is approximately 100% relative to the wood end hydroxyl group equivalent of the polyether compound. -0.05 to 5 equivalents, preferably 0.1-
Use 3 lids.

As for bonding conditions, the polyether compound and the binder are mixed, and the binder is heated to 40 to 15% while stirring.
Heating is carried out at a temperature in the range of 120° C. to 120° C., and if necessary, an acid or base catalyst commonly used for bonding can be used.

When bonding with a binder using a polyvalent carboxylic acid or a polyvalent carboxylic acid derivative, the proportion of the binder used is arbitrary, but generally it is based on the wood end hydroxyl group equivalent of the polyether. 0.05 to 5 equivalents, preferably (-< is 0.
1 to 3 equivalents are used.

When using a polyhydric carboxylic acid, the bonding conditions include the polyether compound and the binder in the presence or absence of an inert solvent, if necessary, under reduced pressure at 6°C (1 to 250°C,
The purpose can be easily achieved by carrying out heat dehydration, preferably at a temperature in the range of 80 to 220°C. in this case,
Conventional esterification catalysts can be used to facilitate the reaction.

In addition, when using a polycarboxylic acid halide, the polyether compound and the binder are passed through an inert gas in the presence or absence of an inert solvent to facilitate the formation of halogenated water, or Using a known agent that can easily supplement hydrogen halide,
, preferably 21-〈The objective can be easily achieved by reacting in the range of 0 to 120°C.

When bonding is performed using a peroxide as a binder, the proportion of the binder (radical generating catalyst) used is 0.055% by weight to 0% by weight, preferably 0.1% by weight based on the polyether compound. It can be used arbitrarily in the range from 5 to 1%.

For example, Journal
of Applied Polymer 8oien
aeVol 'i' pp461-468 (1963)
These known techniques can be applied directly to the connection referred to in the present invention. Generally, a predetermined amount of binder is added to a polyether compound in the presence of a solvent.
．． Mix in the absence of water, 50 to 250°C, preferably L
reacts in the range of 70 to 180°C, and if necessary, the solvent can be distilled off to obtain the target substance.

When binding using formalin as a binding agent, known techniques can be used, but generally it is carried out as follows.

22- That is, formalin is used in an amount of 0.1 to 10 equivalents, preferably 0.5 to 5 equivalents, and the acidic catalyst is used in an amount of 0.05 to 0.2 equivalents relative to the equivalent of the polyether compound. ('1 (Add 15 equivalents and raise the temperature to 60-1 (10 ° C., stir for 1-3 hours,
Thereafter, the temperature is raised to 00-180''C to complete the reaction.

As the bonded polyether compound, as mentioned above, two or more molecules of a polyether compound in which an alkylene oxide is added to a compound that blocks one or more active hydrogen atoms in the molecule,
Examples of bonded polyether compounds bonded with a binder include those having a molecular weight of 6,000 to 600,000, preferably 10,000 to 300,000.

The bound polyether compound has a linear or network structure, or a mixture of both.

[b] In the acid component, phosphoric acid esters of polyhydric alcohols or their derivatives include those obtained by esterifying polyhydric alcohols with a phosphorylating agent by a known method.

Specific examples of polyhydric alcohols include those having two or more hydroxyl groups in the molecule, such as those that block two hydroxyl groups, such as glycols such as ethylene glycol, propylene glyco-p1bentanediol, and three hydroxyl groups.
Those containing 4 hydroxyl groups, such as glycerin, butanetriol, hexanetriol, trimethylolpropane, triethanolamine, etc. Those containing 5 or more hydroxyl groups, such as diglycerin, pentaerythritol, sorbitol, etc. Examples include xylitol, sorbitol, glucose, sucrose, partially saponified polyvinyl acetate, partially saponified polyvinyl acetate copolymer, cellulose, and starch. Also included are derivatives in which at least one OH group remains, such as partially etherified products or partially etherified products of the above-mentioned alcohols.

Examples of the phosphorylating agent include phosphorus pentoxide, phosphorus oxychloride, phosphorus trichloride, metaphosphoric acid, and thiophosphate.

The phosphoric acid compound of polyhydric alcohol is a monoester, a polyhydric ester or a /In ester thereof.

The phosphoric acid ester of polyhydric alcohol or its salt can be used as the F15 reducing agent of the present invention either in its acid form or in its salt form.

Cations that form salts include metals such as sodium, potassium, calcium, and magnesium, ammonia,
Amines, 44 more! ) amines. Examples of the salt include basic salts, neutral salts, and acid salts.

The thinner of the present invention comprises (a) an acid component, a polyether compound or a bonded polyether compound having a certain specific molecular weight, and (b') a phosphoric acid ester of a polyhydric alcohol or a salt thereof. [a] Acid component (b') The blending ratio with the 25- component is (a)/(b') = 50 by weight.
150 to 9515, preferably l, (ij '10/
It is 30-90/1(').

=26 - The amount of f'6 reduction of the present invention added is 0.01 to 5.0% by weight, preferably 0.03 to 5.0% by weight, based on the right leg water slurry.
The amount is 2.0% by weight, and excellent effects can be achieved with this added amount. The limit of the fluidity of lime-wood solace varies depending on the type of limestone and the particle size, but in general, it loses fluidity when the coal concentration is around 50 deuterium unless F-reducing agent (5) is added. If lime is added, the viscosity decreases significantly, so it has fluidity even when the coal concentration is 61% by weight or more, especially 70% by weight or more.Furthermore, when cleaned lime is used, the coal concentration increases by several points. ,
Generally, 3 to IO points - F + f.

The thinner of the present invention can also be used in combination with other surfactants.

Regarding the method of producing the coal-water slurry and the method of adding the fI reducing agent, there are two methods: dry pulverizing the coal in advance and then mixing the thinning agent into the aqueous solution; A method of adding a VJ agent, a method of adding coal, water, and a thinner to a mill and mixing while crushing lime, or a method of mixing using a cleaned stone head instead of coal in each method. Forfeiture can be made in any manner.

The reason why the viscosity reducing agent of the present invention exhibits excellent effects is (a)
After the acid component is strongly adsorbed to the particle surface by the special structure of the polyether compound with a specific molecular weight or the bonded polyether compound, the numerous ether bonds hydrate the surrounding water, making this wood a lubricant. In addition to changing the structure to have a functional effect, (due to the action of the phosphoric acid ester of polyhydric alcohol or its salt as the BL component, the particle surface is charged with an appropriate charge and the repulsive force between the particles increases, so the coal particles It is thought that it becomes stable as a primary particle and improves fluidity.

In addition, if you use lime that has been cleaned by deashing, the effect will further increase.During deashing, the ash, which is highly wood-loving, fine particles, and has a large surface area, is removed. This is because the thinner of the present invention effectively acts on the coal surface with improved coal surface, thereby increasing the lime concentration.

The thinning agent of the present invention has an excellent effect of stably dispersing coal in water, and even when used for a long period of time, for example, one month, it does not cause water separation and maintains a homogeneous swath of coal. ing.

As described above, the thinner of the present invention is preferably 0.01 to 560% by weight, preferably 0.03 to 2.0% by weight, based on the lime-water slurry.
By simply adding 0% to 1% by weight, it is possible to significantly reduce the viscosity of lime-water slurry (7) and to create a coal-wood souffle that can be pumped at high concentrations.

A major example is shown below. In the examples, percentages are by weight.

Epilepsy Example 1 A predetermined amount of the f+5 agent shown in Table 1 was dissolved in a water bath solution.
Coal pulverized to 80% pass of 200 mesh is added at room temperature with stirring to prepare a coal-wood slurry of a predetermined concentration. The viscosity of this slurry is measured at 25''C and the fluidity is observed.
After putting the coal into a cylinder to a height of 18 cIM and leaving it for one month, the coal concentration in the upper layer (1 cm from the top) and lower layer (1 cm from the bottom) was measured.

The test results are shown in Table 2. As shown in Table 2, when the thinner of the present invention is added, the coal concentration is 76 to 78%.
The viscosity of the slurry is 440 to 1.5 ('++'IOP), and the fluidity is extremely good compared to when the polyether compound is added alone.Also, even after the slurry has been left standing for one month, the coal It is very stable with almost no sedimentation.In contrast, it is possible to add a general anionic surfactant, add phosphoric acid ester) V salt alone,
In the case where no thinner is added, the viscosity is 20,000 cP or more at 50% coal-made J and does not flow at all.

Example 2 A clean lime-water slurry of a predetermined concentration is prepared in the same manner as in Example 1 using cleaned stone. The coal particle size is 80% pass of 200 mesh. Measure the fI5 degree of this slurry at 25°C 1-1 and also observe the fluidity. After this slurry was allowed to stand for one month, the coal concentration in the second and lower layers was measured in the same manner as in Example 1.

The thinners of the present invention used in the test are shown in Table 1. The test results are shown in Table 3.

As shown in Table 3, when the thinner of the present invention is added to the 9-clarified coal-water soothfree, the viscosity is 490-1.550 cP even when the coal concentration is 79-81%, and the polyether compound is added alone. The viscosity is extremely low and the fluidity is good compared to the case where the In addition, even after the slurry was allowed to stand for one month, it remained very stable with almost no coal settling.

To this, add 1 to a general anionic surfactant,
When phosphoric acid ester) V salt is added alone or when no thinner is added, the viscosity is 20.00 at a coal concentration of 50%.
(It's over IOP and doesn't flow at all.

−6ε

Claims (1)

[Scope of Claims] (1) A TI5 reducing agent for high-concentration stone removal-water slurry used to reduce the viscosity of a stone removal slurry and improve fluidity and stability, comprising: (a) intramolecular A polyether compound obtained by adding an alkylene oxytra to a compound having one or more, preferably three or more, more preferably five or more active hydrogen atoms, or a bonded polyether in which two or more molecules of the above polyether compound are bonded with a binder. A compound having a molecular weight of a polyether compound or a bonded polyether compound of 6,000 to 600,000, preferably 10,000 to 300,000; (b) a phosphoric acid ester of a polyhydric alcohol or a salt thereof; and Thinning agent for lime-water slurry (2) The polyether compound or the combined polyether compound is rich in ethylene oxide, and its excavation rate is 10 to 100 of the total allelegylene oxide]i Brittle%, preferably 3
The tlI5 reducing agent for coal-wood slurry according to claim (1), which has a concentration of 0 to 95%. The blending ratio of component (31ra) and component [b] is the weight ratio [
a]/(b'] = 5 (1150-9515, good i L
<tj near o/s. The flI5 reducing agent for water slurry according to claim 1 or claim 121, which has a ratio of 90/10 to 90/10. (41 coal concentration is 61 fjk% or more, preferably 70
Coal weighing more than 100 yen - Choice of any one of claims (1) to (3) for use in water souffle.
Thinning agent for water souffle. (5) The thinner for stone S-water slurry according to any one of claims 1 to 4, wherein the coal is cleaned coal.