JPH11335680A - Production of carbonaceous solid-water slurry - Google Patents

Abstract

PROBLEM TO BE SOLVED: To produce the subject slurry having a favorable apparent viscosity at the maximum possible concentration by applying a shearing force to a hydrous cake of carbonaceous solid fine particles without adding a dispersing agent, kneading the resultant material, then adding the dispersing agent to the kneaded material and further kneading the prepared mixture. SOLUTION: A shearing force is applied to a hydrous cake of carbonaceous solid fine particles without adding a dispersing agent to knead the hydrous cake in a first kneading step. The dispersing agent is then added to the kneaded material obtained in the first step to knead the resultant mixture in a second kneading step. Water for regulating the concentration may be added in the first and/or the second steps. Specifically, e.g. the hydrous cake of the carbonaceous solid fine particles is charged into a container and the shearing force is applied thereto with rotating blades installed in the container to thereby knead the material until a pasty form is obtained in the first step. A naphthalenesulfonic acid-formalin condensate which is an anionic surfactant, etc., are preferred as the dispersing agent. The amount of the dispersing agent is preferably 3-10 g based on 1 g of coal.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing low-grade coal, high-grade coal or a water slurry of petroleum residues such as pitch and coke.

[0002]

2. Description of the Related Art Coal-water slurry (Co) is prepared by adding water and additives such as dispersants to coal powder obtained by grinding coal.
al Water Mixture (hereinafter referred to as “CWM”) is a fluid, and is easy to handle.
Moreover, the price per unit calorie is lower than that of heavy oil and the like, so it is attracting attention as a fuel replacing oil. CWM
Has a high concentration of 60 to 75% by weight (water content of 25 to 40% by weight), preferably about 70% by weight or more, in order to perform good thermal decomposition and gasification and to obtain high combustion efficiency. Is required. Further, CWM needs to be adjusted to a preferable viscosity from the viewpoint of transport efficiency, for example, an apparent viscosity of about 1000 cP (centipoise).

In the conventional CWM production method, coarse coking coal is put into a pulverizer / kneader together with conditioning water and a dispersant, and kneading is performed while pulverizing the coking coal into fine powder, or After wet pulverization and dewatering in a pulverizer to obtain a coal pulverized coal dewatered cake (hereinafter referred to as “dewatered cake”),
The CWM is manufactured by putting it into a kneader together with water and a dispersant and kneading it.

[0004]

However, in the above-mentioned conventional method, dispersion of coal pulverized coal is not sufficiently achieved, and if the type of coal is not selected, the apparent viscosity is about 1000 cP and the concentration of coal is, for example, about 70% by weight. It is difficult to obtain a high concentration of CWM. Regarding this point, the present inventor has found that in the conventional method, the dispersant is added from the beginning of kneading, so that the fluidity of the contents of the kneader is large and the resistance when agitating becomes small, so that the aggregated particles (secondary particles) It is speculated that this is due to the weak power of dispersing).

In particular, when low-grade coal such as sub-bituminous coal or lignite is to be used as a raw material for CWM, the low-grade coal has high hygroscopicity and high moisture, and contains oxygen such as phenol group and carboxyl group. High concentration CW due to high hydrophilicity of coal surface because it contains many hydrophilic groups
It is not easy to manufacture M.

The present invention has been made under such circumstances, and an object of the present invention is to provide a method for producing a CWM capable of obtaining a carbonaceous solid-water slurry such as CWM having a preferable apparent viscosity and a concentration as high as possible. Is to provide.

[0007]

SUMMARY OF THE INVENTION The present invention provides a first kneading step of kneading a wet cake of carbonaceous solid fine particles by applying a shearing force without adding a dispersant thereto and kneading the mixture. The dispersant is added to the kneaded mixture, and the mixture is kneaded.
And a second kneading step of obtaining a water slurry. Other inventions include a pulverizing step of finely pulverizing a carbonaceous solid in the presence of moisture, a dehydrating step of dehydrating a slurry obtained in the pulverizing step, and a carbonaceous solid fine particle hydrogel obtained in the dehydrating step. -Kneading by adding a shearing force without adding a dispersant to
A kneading step, and a second kneading step of adding a dispersant to the kneaded product obtained in the first kneading step and kneading the mixture to obtain a high-concentration carbonaceous solid-water slurry. This is a method for producing a solid-water slurry.

[0008] Still another invention is a pulverizing step of pulverizing a carbonaceous solid made of low-grade coal in the presence of moisture;
A reforming step of treating the slurry obtained in the pulverization step with hot water under pressure and heating to reform the slurry, a dehydration step of dewatering the slurry obtained in the reformation step, A first kneading step of applying a shearing force without adding a dispersant to the water-containing cake of carbonaceous solid fine particles obtained in the step, and kneading the mixture; and adding a dispersant to the kneaded material obtained in the first kneading step. And a second kneading step of obtaining a highly concentrated carbonaceous solid-water slurry.

In the above invention, the first kneading step and the second kneading step
Water for concentration adjustment may be added in at least one of the kneading steps. In the first kneading step, kneading is performed, for example, until the hydrated cake of carbonaceous solid fine particles becomes a paste. The hydrated cake of carbonaceous solid particles has a coal concentration of, for example, 60 to 75% by weight. As a specific method of applying a shearing force, a carbonaceous solid particulate hydrous case is placed in a container.
Then, a shear force is applied to the cake containing the carbonaceous solid fine particles by, for example, a rotating blade provided in the container. In this case, the container is configured to rotate, and the rotor is configured to rotate about an axis at an eccentric position substantially parallel to the rotation axis of the container. The technical scope of the present invention includes a case where a small amount of a dispersant is contained in the first kneading step so that the hydrated cake of carbonaceous solid fine particles is not fluidized.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the method for producing a carbonaceous solid-water slurry of the present invention is applied to a method for producing CWM will be described below.

FIG. 1 shows the CW used to carry out the method of the present invention.
It is a figure showing the whole M manufacturing device composition. This CWM manufacturing apparatus includes a reforming pretreatment system 1, a reforming system 2,
It is composed of the WM system 3. First, the overall flow of this manufacturing apparatus will be briefly described. A carbonaceous solid, for example, low-grade coal is wet-pulverized in the reforming pretreatment system 1 to obtain a pulverized coal slurry, which is reformed in the reforming system 2. Dewatering of the modified pulverized coal slurry (modified coal slurry) in the CWM conversion system 3 to obtain a modified coal cake (dewatered cake);
Further, water is added to the modified charcoal cake and kneaded to form a paste, which is further kneaded with a dispersant to obtain a product CWM.
Get.

Next, each system will be described in detail. (Reforming Pretreatment System) In this system 1, a low-grade coal, such as lignite or sub-bituminous coal, which is a starting material, is crushed by a crusher 11.
And coarsely pulverized, and the coarsely pulverized coal is fed to a wet pulverizer 12 to be wet pulverized to a particle size of 3 mm or less, preferably 1 mm or less by adding water. 700μ for bituminous coal
m or less. This pulverization is adjusted based on the hardness of the starting material so as to fall within the particle size range of the final product slurry in consideration of the after-mentioned pressure drop or the effect of fine pulverization during kneading. After classification as required, the obtained pulverized coal slurry having a concentration of 10 to 40% by weight is temporarily stored in a pre-reformation slurry tank 13, made to have a high pressure by a pump P, and sent to the reforming system 2.

(Reforming System) In this system 2, the high-pressure slurry (pulverized coal slurry) supplied from the slurry tank 13 before reforming via the pump P is supplied to the heater 2
1 to 250-330 ° C., reforming it in high-pressure water of, for example, 120-150 atm in a reforming reactor 22 for usually 10-30 minutes, and cooling the reformed slurry by a cooler 23 Then, the reformed coal slurry is sent to the high-pressure tank 24, and the reformed coal slurry is reduced in pressure via the pressure reducing means 25, and then stored in the slurry tank 26 after reforming.

(CWM conversion system) In this system 3, the reformed carbon slurry supplied from the reformed slurry tank 26 is dewatered by a dehydrator 31, for example, a rotating cylinder 31a having fine holes formed on the peripheral surface. , The slurry is adhered to the rotary cylinder 31a, water is drawn into the inside, and solid-liquid separation is performed.
% By weight) and particle size (700 μm or less). The obtained modified charcoal cake (dehydrated cake) is supplied to a kneading machine 40 together with a predetermined amount of adjusted water, and kneaded to obtain a paste containing high-concentration coal. This paste is a so-called viscous hydrated cake that has solidified wet sand, like a syrup, paste, or dumpling when flour is well kneaded.
For example, it has a viscosity of 5000 cP or more. In the system 3, the paste is sent to a slurry mixing tank 32, a predetermined amount of a dispersant is added to the mixing tank 32, and the mixture is kneaded to obtain a desired concentration at a desired viscosity (usually 60 to 75).
% By weight) and produce the product CWM via the transfer pump 33.

FIGS. 2 and 3 show a high-speed stirrer as an example of the kneader 40. FIG. This high-speed stirrer has a container 41 that forms a stirring tank that rotates at a relatively low speed with a bottomed cylindrical shape and its center axis as a rotation axis (indicated by a dashed line in FIGS. 2 and 3), and the container 41 faces in the opposite direction. And a stirring blade 42 that rotates at high speed.

The container 41 used in the later embodiment has an inner diameter of 26 cm and a height of the upper surface from the bottom of 26 cm, and is supported by the support table 50 with its central axis inclined obliquely. I have. Inside the container 41, a partition member 43 for preventing a part of the reformed carbon cake from remaining without being stirred is provided at an inner corner of the container above the central axis. The partition member 43 is attached to, for example, a lid 44 of the container 41.

The stirring blade 42 is provided with four blades 46 having an outer diameter of 14 cm and a width of 1.5 cm, for example. The stirring blade 42 has its shaft 45, that is, the stirring blade 4
2 is supported by the support base 50 so that the rotation axis is parallel to the central axis of the container 41 and lower than the central axis of the container 41, that is, at a position eccentric to the central axis of the container 41. I have. The blades 46 of the stirring blade 42 are located on the bottom surface 47 of the container 41.
, So that the fine particles of the modified coal descending from the upper part in the container 41 can be efficiently stirred. The container 4 is provided on the support base 50.
1 and motors 51 and 52 for rotating the stirring blade 42 are attached.

The container 41 is supported horizontally so that its central axis is vertical, and the rotation axis of the stirring blade 42 may be eccentric in the front, rear, left and right directions. In this case, a partition member is provided at the corner of the bottom of the container. Or the like may be provided to prevent a part of the modified charcoal cake from remaining in the corner without stirring. Further, as the stirring blade 42, two or more blades may be provided along the shaft 45, and the number of blades may be three or less, or five or more.
The disk member may be provided at the tip of the shaft 45 so as to be orthogonal thereto, and for example, a blade parallel to the shaft 45 may be provided along the outer periphery of the disk member. Good. Two or more stirring blades may be provided.

The slurry mixing tank 32 includes a cylindrical container having a bottom and rotating blades rotating in the container.

As the dispersant, various surfactants can be used. In anionic surfactants, ligninsulfonates, especially calcium, magnesium and sodium salts, partially desulfonated ligninsulfonates having a sulfonic acid group, a carboxyl group, a phenolic hydroxyl group or an alcoholic hydroxyl group as a functional group. Preferred are the naphthalenesulfonates, especially the sodium or magnesium salts thereof, the polystyrenesulfonates, especially the sodium salts, and the naphthalenesulfonic acid formalin condensates or the sodium or magnesium salts. The dispersant is selected from one of these.
Consisting of two or more species. Of these listed anionic surfactants, naphthalene sulfonic acid formalin condensate and polystyrene sulfonate have the advantage that the change in performance due to high and low temperature is small and the amount of addition required for slurrying is small.

As the nonionic surfactant, for example, polyoxyethylene octyl phenyl ether, polyoxyethylene cetyl ether, polyoxyethylene sorbitan monolaurate and polyoxyethylene sorbitan monopalmitate are useful. In general, nonionic surfactants are easy to foam, and the performance changes greatly depending on the temperature. However, nonionic surfactants have the advantage of being able to remarkably promote slurrying of coal due to strong lipophilicity. The addition amount of the dispersant is preferably 3 to 10 g per kg of coal.

Next, an embodiment of a manufacturing method according to the present invention using the system having the above configuration will be described with reference to FIGS. First, a starting material composed of low-grade coal is used as a pre-reformation slurry in the pre-reformation treatment system 1, and is used as a reformed coal slurry in the reformation system 2. Then, the modified coal slurry is dehydrated by the dehydrator 31 of the CWM conversion system 3 to obtain a dewatered cake (modified carbon cake). The dewatered cake is put into a kneader 40 composed of, for example, a high-speed stirrer having the structure shown in FIGS. 2 and 3 together with water (adjustment water) for adjusting viscosity (see step S1 in FIG. 4), and the kneader 40 is operated. The dehydrated cake is mixed with the conditioned water, and kneaded to form a paste (see step S2 in FIG. 4). The kneading is completed when the paste becomes a paste, and it can be visually confirmed that the kneaded material is in a paste. This step S2 corresponds to a first kneading step, for example, the stirring blade 4
2 is performed at a peripheral speed of 10 to 40 m / sec for about 10 to 30 minutes. Then, the paste-like kneaded material is put into the slurry mixing tank 32 together with a predetermined amount of the dispersant (step S in FIG. 4).
3), the kneaded material is mixed with a predetermined amount of dispersant by operating the slurry mixing tank 32, and kneaded (see step S4 in FIG. 4). Thereby, the desired concentration of C at the desired viscosity
WM is obtained. This step S4 corresponds to a second kneading step.

According to the above-described embodiment, when CWM is produced from a dewatered cake, water and a dispersant, fine particles can be obtained by kneading only the cake and water without adding a dispersant at the beginning of the kneading of the dewatered cake. When the kneaded product becomes a paste, a dispersing agent is added and the mixture is further kneaded, so that coal having a desired viscosity (for example, apparent viscosity is 1000 cP) and a high concentration of coal, for example, about 70% by weight. Is obtained. According to the experiment of the present inventor, the concentration was about 6% higher than the coal concentration in CWM obtained by the conventional production method. It is particularly effective for dispersing fine particles of low-grade coal that has undergone a reforming reaction. Note that the present inventor promotes the dispersion of the fine particles by kneading without adding a dispersant, because the resistance at the time of stirring is large, that is, a strong shear force acts on the kneaded material. It is presumed that secondary particles formed by aggregation are decomposed.

Further, according to the above-described embodiment, an effect is obtained that the required amount of a generally expensive dispersant is significantly reduced, and the cost can be reduced. According to experiments performed by the present inventors, the required amount of the dispersant was reduced to one third when low-grade coal was used. In this regard, the present inventor has found that the low-grade coal is reformed in the reforming system 2 so that the oil oozes out on the surface of the coal powder, and the effect of dispersing the oil is promoted by the first kneading step. We think that even if the amount of the agent is small, it will disperse considerably. In addition, in bituminous coal that does not require reforming, it is considered that the oil component originally adheres to the surface of the powder to some extent, so that similarly, it is considered that a smaller amount of dispersant is required than in the conventional case.

Further, according to the above-described embodiment, the quality of CWM is improved, and the simplification of the CWM manufacturing system and the process can be achieved, thereby reducing the cost.

In the above, according to the present invention, when kneading the modified charcoal cake in the kneader 40, a small amount of a dispersant may be added to the extent that the kneaded material is not fluidized, or water for viscosity adjustment may be mixed into a slurry. It may be added at the time of kneading in the tank 32. Further, both processes may be performed by the kneading machine 40 without using the slurry-mixing tank 32, and in that case, the timing of adding the water for adjusting the viscosity to the kneading machine 40 is the same as that before the dispersant is added to the kneading machine 40. Or later. Further, when a high-grade coal such as bituminous coal or a petroleum residue is used as a starting material, the reforming treatment by the reforming system 2 is unnecessary, and the slurry obtained by finely pulverizing the wet pulverizer 12 is used as a dehydrator 31. And then put into the kneader 40.

If necessary, carboxymethylcellulose (CMC), hydroxyethylcellulose (HE
C), a stabilizer such as polyvinyl alcohol, colloidal silica, kaolin, bentonite, and attapulgite, as well as a combustion aid, a desulfurizing agent, and the like can be added to the slurry.

[0028]

(Example 1) Asam asam coal (sub-bituminous coal produced in Indonesia), which is a low-grade coal, is used as a raw coal, and the raw coal is finely pulverized to a particle size of 1 mm or less by a corundum mill to obtain a coal having a solid concentration of 30 wt%. -A water slurry was obtained. Then, the slurry was subjected to a hot water treatment (reforming treatment) at a temperature of about 320 ° C. for a reforming time of 10 minutes using an autoclave apparatus having an internal volume of 10 liters, followed by a dehydration treatment to make a modified charcoal cake (dehydration treatment). Cake). This reformed charcoal cake is put into a kneader having a structure shown in FIGS. 2 and 3 together with a predetermined amount of adjusted water, and kneaded at a peripheral speed of 20 m / sec until the content, that is, the powder of the reformed charcoal becomes a paste. went. The obtained paste was charged into a slurry mixing tank, and a naphthalenesulfonic acid formalin condensate (Hycol 21) was added as a dispersant at a rate of 5 g / kg-coal, and a peripheral speed of 15 m
/ Sec. Finally, attapulgite was added as a stabilizer at a rate of 2000 ppm / CWM.

In the above, CWMs having various viscosities were obtained by variously changing the amount of the conditioning water. FIG. 5 shows the relationship between the viscosity of CWM and the coal concentration.

In order to obtain a viscosity of 1000 cP, the amount of the dispersant was varied and the change in apparent viscosity of CWM was examined. FIG. 6 shows the relationship between the amount of the dispersant added and the viscosity of CWM.
Shown in In addition, in FIG. 6, 69. described in the graph.
5 wt%, 63.5 wt%, and 67.0 wt% indicate the ultimate concentration of coal at 1000 cP in Example 1 and Comparative Examples 1 and 2 described below, respectively.

(Comparative Example 1) Without using a kneader having the structure shown in FIGS. 2 and 3, only a conventional ball mill was used.
From the beginning of the kneading of the modified charcoal cake, a dispersant was added together with the conditioning water and kneading was performed to obtain CWM. Other conditions were the same as in Example 1 above. Also in Comparative Example 1, the relationship between the viscosity of CWM and the coal concentration was examined by variously changing the amount of the conditioning water. In addition, to obtain a viscosity of 1000 cP, the amount of the dispersant added was variously changed, and the relationship between the amount of the dispersant added and the viscosity of CWM was examined. The results are shown in FIGS. 5 and 6, respectively.

Comparative Example 2 A kneader having the structure shown in FIGS. 2 and 3 was used, and kneading was carried out from the beginning of the kneading by adding a dispersing agent together with the adjusted water to obtain a CWM. Other conditions were the same as in Example 1 above. Also in Comparative Example 1, the relationship between the viscosity of CWM and the coal concentration was examined by variously changing the amount of the conditioning water. In addition, in order to obtain a viscosity of 1000 cP, the amount of the dispersant added was variously changed so that
The relationship with the viscosity of WM was examined. 5 and 6 show the results.
Shown in

(Consideration) As can be seen from FIG. 5, in Example 1, the apparent viscosity was approximately 69.5 wt% at 1000 cp.
Is obtained, and the apparent viscosity around 1000cp is 6
Coal concentrations of 9.1 to 69.9 wt% are obtained. On the other hand, in Comparative Example 1, only a coal concentration of approximately 63.5 wt% was obtained at an apparent viscosity of 1000 cp, and only a coal concentration of 62.9 to 63.6 wt% was obtained at an apparent viscosity near 1000 cp. Therefore, it was confirmed that in the vicinity of the target viscosity of 1000 cP, the CWM of Example 1 had a coal concentration approximately 6 wt% higher than that of Comparative Example 1. This is because the dispersing agent is not added in the initial stage of kneading, and the use of a kneader having a large shearing force in the initial stage of kneading promotes the dispersion of secondary particles formed by agglomeration of coal fine particles. It is considered that as a result, high concentration was achieved.

In Comparative Example 2, the apparent viscosity was 1000
In the vicinity of cP, the coal concentration is about 65.5 wt%, which is lower than that in Example 1, but about 2 wt% higher than that in the case of using a ball mill. Therefore, when the kneading machine shown in FIGS. 2 and 3 is used, the particle size distribution at the time of kneading is better than that of the ball mill.
It is considered that the advantage of the above is in addition to the advantage of the timing of adding the dispersant, and also the advantage of the particle size distribution.

As can be seen from FIG. 6, the apparent viscosity is 10
Comparing the required addition amount of the dispersant for the case of 00 cP, it was 3 g / kg-coal in Example 1, 7 g / kg-coal in Comparative Example 1, and 5 g / kg-coal in Comparative Example 2. Was. Therefore, when kneading is performed in two stages as in Example 1, and the dispersant is added in the latter stage, the required amount may be smaller than when the dispersant is added from the beginning of kneading. confirmed. This is because the coal particles that were originally in an agglomerated state are appropriately disintegrated by the strong shearing force at the initial stage of kneading, and the dispersant is added in that state, whereby the dispersion proceeds rapidly, and the necessary dispersant It is considered that the amount has decreased.

[0036]

As described above, according to the present invention, it is possible to obtain a carbonaceous solid-water slurry such as CWM having a desired viscosity and a higher concentration than conventional ones.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a flow of an example of a CWM manufacturing apparatus used for carrying out a method of the present invention.

FIG. 2 is an overall view of an example of a kneader used in the CWM manufacturing apparatus.

FIG. 3 is a partial perspective view showing a container and a stirring blade of the kneading machine.

FIG. 4 is a flowchart showing a main part of a processing procedure according to the method of the present invention.

FIG. 5 is a characteristic diagram showing the relationship between the viscosity of CWM and the coal concentration in Examples and Comparative Examples.

FIG. 6 shows the amount of dispersant added and C in Examples and Comparative Examples.
FIG. 4 is a characteristic diagram showing a relationship between WM and viscosity.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Reforming pre-processing system 2 Reforming system 3 CWM conversion system 31 Dehydrator 32 Slurry mixing tank 33 Transfer pump 40 Kneader 41 Container 42 Stirrer blade 43 Partition member 44 Lid 45 Shaft 46 Blade 47 Container bottom 50 Support 51, 52 motor

 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Takao Takinami 2110 Saki-cho, Handa, Aichi

Claims (9)

[Claims] 1. A first kneading step of applying a shearing force to a water-containing cake of carbonaceous solid fine particles without adding a dispersant to knead the mixture, and adding a dispersant to the kneaded material obtained in the first kneading step. A second kneading step of kneading and kneading to obtain a high-concentration carbonaceous solid-water slurry. 2. A pulverizing step of finely pulverizing a carbonaceous solid in the presence of water, a dehydrating step of dehydrating a slurry obtained in the pulverizing step, and a carbonaceous solid fine particle hydrogel obtained in the dehydrating step. A first kneading step of kneading the mixture by applying a shearing force without adding a dispersing agent thereto; and adding a dispersing agent to the kneaded material obtained in the first kneading step and kneading the mixture to obtain a high-concentration carbonaceous solid. And a second kneading step of obtaining a water slurry. 3. A pulverizing step of finely pulverizing a carbonaceous solid made of low-grade coal in the presence of moisture; and treating the slurry obtained in the pulverizing step with hot water under pressure and heating. A dewatering step of dewatering the slurry obtained in this reforming step; and a shearing force without adding a dispersant to the water-containing cake of carbonaceous solid fine particles obtained in this dewatering step. And a second kneading step of adding a dispersant to the kneaded product obtained in the first kneading step and kneading to obtain a high-concentration carbonaceous solid-water slurry. A method for producing a carbonaceous solid-water slurry, comprising: 4. The method for producing a carbonaceous solid-water slurry according to claim 1, wherein water for concentration adjustment is added in at least one of the first kneading step and the second kneading step. . 5. The carbonaceous solid-water according to claim 1, 2, 3 or 4, wherein in the first kneading step, the carbonaceous solid fine particle water-containing cake is kneaded until it becomes a paste. Manufacturing method of slurry. 6. The hydrated carbonaceous solid particulate cake has a coal concentration of 60 to 75% by weight.
6. The method for producing a carbonaceous solid-water slurry according to 2, 3, 4, or 5. 7. In the first kneading step, a water-containing cake of carbonaceous solid fine particles is charged into a container, and a shearing force is applied to the water-containing cake of carbonaceous solid particles by a rotating blade provided in the container. The method for producing a carbonaceous solid-water slurry according to claim 1, 2, 3, 4, 5, or 6. 8. The container is configured to rotate, and the rotor is configured to rotate about an axis at an eccentric position substantially parallel to the axis of rotation of the container. 8. The method for producing a carbonaceous solid-water slurry according to 7. 9. The method according to claim 1, wherein the first kneading step contains a small amount of a dispersant such that the hydrated cake of carbonaceous solid fine particles is not fluidized. 9. The method for producing a carbonaceous solid-water slurry according to claim 7, 7 or 8.