JP2001354466A - Cement milk - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide cement milk which contains incineration ash that is obtained by incinerating sewage waste discharged in a large amount from a sewage treatment plant and mixed into a cement milk base material as an admixture, and enables effective utilization of such incineration ash conventionally disposed as a kind of industrial waste. SOLUTION: This cement milk is produced by mixing ground incineration ash used as an admixture into a cement milk base material which is a mixture consisting of water, cement and bentonite, in a 10-70% mixing ratio of the incineration ash to the bentonite, wherein the ground incineration ash has a <=48 deg. angle of repose and <=80 μm particle size.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to sewage sludge incineration ash obtained by incinerating sewage sludge generated in large quantities in sewage treatment plants.
(Hereinafter simply referred to as incineration ash) as cement admixture in cement milk as an admixture, and in particular to cement milk which can be effectively mixed in incineration ash which has been disposed of as a kind of industrial waste. Things.

[0002]

2. Description of the Related Art Conventionally, in producing cement milk, water and cement are used, as exemplified in, for example, Japanese Patent Application Laid-Open Nos. 6-256,056, 7-53597, and 8-157823. A large amount of admixtures such as bentonite, fly ash, blast furnace slag fine powder and the like were mixed into the basic cement milk obtained by mixing.

[0003]

However, since the admixtures such as bentonite and fly ash are relatively expensive, there has been a problem that the production cost of cement milk is high.

On the other hand, conventionally, in a sewage treatment facility,
A large amount of sewage sludge containing a large amount of organic matter that was routinely removed from sewage was generated. The sewage sludge generated in such a large amount has been incinerated in many cases and landfilled at an industrial waste disposal site as a kind of industrial waste as incinerated ash.

Further, in the above-mentioned sewage treatment facility, sewage sludge is generated as long as sewage treatment is operated on a daily basis, and incineration ash obtained by incinerating the sewage sludge operates in a sewage treatment plant. As long as it continues to occur forever, relying solely on landfills for the treatment of incinerated ash, as in the past, has a problem that sometime the landfill treatment facility will be at a standstill and the conventional sewage treatment system will not be feasible. Was.

[0006] The cement milk according to the present invention is a completely novel invention developed in view of the above-mentioned many problems,
In particular, as described above, incineration ash is used instead of part of the admixture of bentonite and fly ash mixed in cement milk to effectively use industrial waste and significantly reduce the cost of cement milk production. It provides a revolutionary technology that makes it possible.

Further, in the present invention, the ratio of incinerated ash used as an admixture in cement milk can be significantly increased, and by mixing incinerated ash into cement milk, the above-mentioned conventional ash can be obtained. The present invention provides a completely new technology of cement milk that can enhance specific performance more than when only an admixture such as bentonite is used.

[0008]

In order to solve the above-mentioned major problems, the present applicant actively uses incinerated ash that has been disposed of in large quantities as an admixture for cement milk. The gist of the first invention is a cement milk containing bentonite, wherein an admixture composed of sewage sludge incineration ash is mixed with the bentonite in an amount of 10 to 70% by weight. .

In the first aspect of the present invention, the incinerated ash is mixed as an admixture into the cement milk to constitute the cement milk, so that the incinerated ash which has been conventionally disposed of in large quantities can be effectively used. Moreover, since the incinerated ash can be replaced with a part of bentonite, the cost of cement milk can be significantly reduced.

Further, when incinerated ash is mixed into cement milk, it is exposed to a highly alkaline environment in the cement milk to release soluble silicic acid. The calcium ion generated in the cement milk undergoes a coagulation reaction, so that the strength of the cement milk can be further increased. Therefore, a greater strength can be obtained than when admixtures such as bentonite, fine silica powder, and mountain clay powder are mixed into cement milk. Therefore, when incinerated ash is used, the amount of cement can be smaller than when other bentonite or the like is used.

As described above, when the incinerated ash mixed into the cement milk is less than 10% by weight, the effect of mixing becomes small. On the other hand, when the incinerated ash mixed exceeds 70% by weight, the following Table 9 is used. As can be seen from the above, in order to obtain a predetermined funnel viscosity, the total admixture amount of incinerated ash and bentonite must be significantly increased, which is not practical. Therefore, the amount of incinerated ash mixed into cement milk is 10
Up to 70% by weight is effective.

[0012] The gist of the second invention of the cement milk according to the present invention is that the sewage sludge incineration ash has a brane specific surface area of 7000.
cm2 / g.

In the second aspect of the present invention, since the incinerated ash has a Blaine specific surface area of 7000 cm2 / g or more, the uniaxial strength at the time of solidification can be increased. Further, workability (operability) at the time of manufacturing can be improved.

[0014] The gist of the third invention of the cement milk according to the present invention is the cement milk of the first invention, wherein the incinerated sewage sludge ash is subjected to particle size adjustment by pulverization or classification.

[0015] In the third aspect of the present invention, the incinerated ash mixed in the cement milk is subjected to particle size adjustment by pulverization or classification, so that the specific surface area of the brane can be increased. Can be further increased, and workability during manufacturing can be further improved.

The gist of the fourth invention of the cement milk according to the present invention is the cement milk of the third invention, wherein the average particle size of the sewage sludge incineration ash is 2 to 20 μm.

In the fourth aspect of the present invention, the average particle size of the incinerated ash mixed with the cement milk is limited to 2 to 20 μm, so that the specific surface area of the brane can be increased more reliably. In this case, the uniaxial strength can be further increased, and the workability at the time of manufacturing can be further improved.

The gist of the fifth invention of the cement milk according to the present invention is that the sewage sludge incineration ash has a Blaine specific surface area of 9000.
The cement milk according to the third invention, which is in a range of 範 囲 16000 cm 2 / g.

According to the fifth aspect of the present invention, the incinerated ash mixed with the cement milk has a Blaine specific surface area of 9000 c.
By setting it to m2 / g or more, the uniaxial strength at the time of solidification can be further increased, and the workability at the time of manufacturing can be further improved. The specific surface area of the brane was 1600.
If it exceeds 0 cm2 / g, the effect is saturated and the effect of increasing the energy consumption required for adjusting the particle size is obtained.

The gist of the sixth invention of the cement milk according to the present invention is that the crushed incinerated ash is obtained by incinerating sludge obtained by using a polymer flocculant or the like. To cement milk according to the fifth to fifth aspects of the present invention.

In the sixth aspect of the present invention, sludge obtained by using a polymer flocculant without using lime or ferric chloride as a sewage treatment material for flocculating the incinerated ash to be used, for example. Because of the use of waste generated when incinerated, it contains a large amount of calcium hydroxide that may increase the water absorption rate, such as the incineration ash using lime or ferric chloride as the sewage treatment material described above. Therefore, there is no need to construct a cement milk having poor strength and durability.

The gist of the seventh invention of the cement milk according to the present invention is a method for producing cement milk, characterized by mixing sewage sludge incineration ash whose particle size has been adjusted by cement, bentonite, pulverization or classification.

In the seventh aspect of the present invention, since incinerated ash whose particle size has been adjusted by pulverization or classification is used, workability can be improved, thereby facilitating the production and obtaining the obtained cement. It has the effect of increasing the uniaxial strength during the solidification of milk.

[0024]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the cement milk of the present invention will be specifically described below. The "incinerated ash" defined as above includes "incinerated ash raw powder" and "particle size adjusted incinerated ash" whose particle size has been adjusted, and among the particle size adjusted incinerated ash, "crushed incinerated ash" ”And“ Classified incineration ash ”classified by sieve. Therefore, in the present specification, when including all, it is simply expressed as "incineration ash", and when including both pulverized incineration ash and classified incineration ash, it is expressed as "grain-adjusted incineration ash", and will be described later. When the “crushed incinerated ash” and the “classified incinerated ash” are specified and used as in the embodiment of the present invention, these are expressed in specific terms.

FIG. 1 is a photomicrograph (1480 times) of the raw incinerated ash powder used in the present invention. The particle size distribution of the incinerated ash raw powder is such that the 10% diameter is 2.96 μm and the 50% diameter is 17.57.
μm, the 90% diameter was 59.03 μm, and the Blaine specific surface area was 7517 cm 2 / g. In general, the incinerated ash raw powder has a Blaine specific surface area of about 7000 to 8000.

FIG. 2 shows the incinerated ash powder used in the present invention in 3
FIG. 3 is a photomicrograph of the pulverized incinerated ash manufactured by repeated pulverization at a magnification of 1,490 times. FIG. 3 is a graph showing the particle size distribution of pulverized incinerated ash manufactured by pulverizing the raw incinerated ash powder once. Similarly 3
FIG. 5 is a graph showing the distribution of the particle size of the pulverized incineration ash produced by pulverization, and FIG. 5 is a graph showing the distribution of the particle size of the pulverized incineration ash produced similarly.

In this embodiment, before describing this embodiment in detail, the characteristics of the incinerated ash used in the present invention will be described, and the obtained incinerated ash powder will be further pulverized. The obtained ground incineration ash will be described.

As the incineration ash that can be used in the present invention, those obtained by using a polymer flocculant without using lime or ferric chloride for sewage treatment are preferable. The composition of such incineration ash is usually in the following range.

Silicon dioxide (SiO2) 40-50% Calcium oxide (CaO) 5-10% Ferric oxide (Fe2O3) 5-12% Aluminum oxide (Al2O3) 13-25% Magnesium oxide (MgO) 5-10% Phosphorus pentoxide (P2O5) 5-15% Sodium oxide (Na2O) 0.5-3% Chloride 100mg / kg

As described in the preceding paragraph, the incinerated ash obtained by using the polymer flocculant is obtained by using the polymer coagulant without using lime or ferric chloride for the sewage treatment material. Calcium hydroxide that may have a high water absorption rate, as incinerated ash using lime or ferric chloride as the sewage treatment material described above, because it uses what is generated when the sludge obtained by incineration is used Is not contained in a large amount, and therefore has strength,
There is no fear of composing cement milk having poor durability.

As shown in the micrograph shown in FIG. 1 above, the present inventors have found that the incinerated ash raw powder that has been incinerated, that is, before pulverization, is often agglomerated and has a large particle size. Since the diameter is in the range, the mass is pulverized by means of crushing or the like to make a large mass finer so as to make the entire size uniform. As a result, the micrograph shown in FIG. 2 or FIG. 3 to FIG. The pulverized incineration ash shown in the graph showing the distribution of the particle size shown could be obtained.

The micrograph of FIG. 2 is an enlarged view of the pulverized incinerated ash obtained by pulverizing the raw incinerated ash powder three times.
It is clear that the variation in the particle size is significantly smaller than that of the incinerated ash raw powder to be ground. Also,
FIGS. 3, 4 and 5 are graphs showing the distribution of the particle size (μm) of the incinerated ash obtained by milling the incinerated ash raw powder once, three times and five times, respectively. Compared to the distribution of ash raw powder (see [0025]), it is clear that the distribution range of the particle size is significantly smaller.

That is, while the particle size of the raw incinerated ash powder has the distribution as described above, the pulverized incinerated ash obtained by pulverizing once, three times and five times is shown in FIG. 3, FIG. 4 and FIG. As shown, about 1-70μ
It is clear that the distribution falls within the distribution of m. In addition, when the particle size of the crushed and adjusted blast furnace slag fine powder exemplified in FIG. 6 is compared with the above-described pulverized incinerated ash shown in FIGS. It is clear that they are similar.

As described above, in crushing the untreated incinerated ash, a sample mill fine crusher was used. This sample mill pulverizer is not a method of grinding a crystalline mass to make it into fine particles, but a method of pulverizing large solid and granular masses into particles, thereby producing a pulverized incinerated ash. The particle size is made uniform so that the distribution range of the particle size can be reduced. Further, even after pulverization once to five times, the obtained particle diameters differed depending on the type and performance of the pulverizer used. Therefore, the number of times of pulverization for obtaining a particle size of a certain size or less depends on the performance of the pulverizer and is not constant.

Further, the present inventors measured the difference between the raw incinerated ash powder and the ground incinerated ash from different angles. That is, when the angle of repose (°) was measured by a powder tester and compared, the results shown in Table 1 below were obtained.

[0036]

[Table 1]

As described above, it is clear that the ground incineration ash which has been pulverized as compared with the raw incineration ash powder has a small angle of repose, and as a result, the fluidity of the powder as a powder changes in a favorable direction. is there. As described above, the angle of repose and the particle diameter are reduced, the flowability is improved, and therefore, the flow range is expanded, and when mixing the powder into the cement milk, the handling is improved, the workability is improved, and It can be mixed evenly and mixed.

The particle size of the admixture mixed into the cement milk has a great effect on the angle of repose and the fluidity of the cement milk.
When the particle size of the crushed incinerated ash is set to 80 microns or less, it is apparent that the handling and workability when mixing the incinerated ash into the cement milk are improved and the fluidity of the cement milk is significantly improved. It became.

It is also clear that when the particle size of the incinerated ash is biased in the 80 micron range and in the 1 micron range, the angle of repose and the fluidity of the cement milk are greatly affected. It has also been found that it is desirable for the average particle size of the incinerated ash to be preferably 2 to 20 microns.

Furthermore, the larger the Blaine specific surface area of the incinerated ash used in the present invention, the higher the uniaxial strength during solidification of the cement milk. Brain specific surface area is 7000c
m2 / g or more, preferably 9000 to 16000 cm2
/ G is more preferable. The range of the brane specific surface area of the incinerated ash raw powder is 7000 to 8000 cm as described above.
Although it is in the range of about 2 / g, it can be further increased by adjusting the particle size of the incinerated ash raw powder by pulverization or sieving.

Next, in the practice of the present invention, the materials used in the production of cement milk will be described as follows.

Cement C: Ordinary Portland cement (pc = 3.16, manufactured by Taiheiyo Cement Co.) Bentonite V: Kunigel V1 (manufactured by Kunimine Industries Co., Ltd.) Incinerated ash: Incinerated ash or pulverized incinerated ash ground five times

In the above-mentioned test, a comparative test was also carried out on the particle size distribution and the Blaine specific surface area of the raw incinerated ash powder and the pulverized incinerated ash.

As a result, the particle size distribution was as described above, but almost no difference was observed between the three pulverizations and the five pulverizations. The Blaine specific surface area of the pulverized incinerated ash after pulverization 1 to 5 times was 12211 cm 2, respectively.
/ G, 12740 cm2 / g, and 12699 cm2 / g. Although the specific surface area of the Blaine of the three times of pulverization and that of the five times of pulverization are slightly reversed, as described above, even if the pulverization is performed three times or more, there is not much change. Range.

Further, the classified incinerated ash classified with a sieve of 325 mesh (44 μm) has a Blaine specific surface area of 8424.
cm2 / g, the particle size distribution was 10% diameter 2.68m, 50%
The% diameter was 13.37 μm, and the 90% diameter was 31.09 μm. The specific surface area of the blast furnace slag obtained and measured for reference is about 4000 cm 2 / g, and the particle size distribution is such that the 10% diameter is 1.89 μm and the 50% diameter is 8.27 μm.
μm, the 90% diameter was 23.22 μm.

The procedure for producing the cement milk according to the present invention was as follows. That is, first, 900 g of tap water is poured into a cylindrical container with two baffles attached to the inner wall of the container in contrast.
It was charged and placed in a stirrer. And the stirring blade of the stirrer is
The rotation speed was adjusted to 350 rpm using a turbine type.
Thereafter, a prescribed amount of bentonite and 50 to 200 g of the above-mentioned incinerated ash raw powder (admixture) were gradually added over about 30 seconds, followed by stirring for 2 minutes.

Immediately after the completion of the stirring for 2 minutes, 250 g of a prescribed amount of ordinary Portland cement was gradually added over a period of about 30 seconds and stirred for 1 minute to complete the preparation of the liquid. In the stirring, a three-one motor manufactured by Shinto Kagaku Co., Ltd. was used. The rotation speed of the blades of this stirrer has an effect of suppressing rotation due to the development of viscosity, but this stirrer used a model having a function of keeping the rotation speed constant.

Next, samples in which the mixing ratio of bentonite, which is an admixture for cement milk, and the incinerated ash raw powder were set to 30:70, 50:50, 70:30 in accordance with the above-mentioned liquid production procedure for producing cement milk. Were prepared and the properties (fluidity) of the cement milk were examined for each, and the results shown in Table 2 below were obtained.

[0049]

[Table 2]

As is apparent from Table 2, the mixture A of bentonite and incinerated ash powder had a mixing ratio of 30:70, and the mixing ratio of bentonite and incinerated ash powder had a mixing ratio of 50: 5.
In each case of the B sample which was set to 0 and the C sample where the mixing ratio of bentonite and the incinerated ash raw powder was set to 70:30, the funnel viscosity, apparent viscosity, plastic viscosity and yield value were as follows:
There was almost no significant difference, and it was found that the fluidity of the cement milk was excellent for all the samples.

The present inventors changed the mixing ratio of bentonite and pulverized incinerated ash into three stages, tested the fluidity of each cement milk, and obtained the test results shown in Table 2 above. Although obtained, the inventors tested the properties of the cement milk according to the invention from yet another angle.

That is, as shown in Tables 3, 4 and 5 described below, the powder mixed with bentonite was (a) fine silica powder, (b) pulverized incinerated ash (five times) and (c) mountain clay powder. And the mixing ratio of bentonite and powder is A30 to 7
0, B50: 50 and C70: 30, three kinds of mixing ratios, and further changing the amount of the admixture composed of these bentonite and powder to 10, 20, 30, 40, 50... As a result of testing the properties (flowability) of the cement milk produced in this manner, the results shown in the following Tables 3, 4 and 5 were obtained.

[0053]

[Table 3]

[0054]

[Table 4]

[0055]

[Table 5]

As shown in Tables 3, 4 and 5, when the incinerated ash fine powder is used as the cement milk mixture as in the present invention, other silica fine powder or mountain clay powder is used. It was found that even when used, cement milk had good fluidity as a whole and that a large amount of incinerated ash fine powder could be mixed.

That is, “Kunigel V1 in the mixing ratio of sample A to powder in a ratio of 30% to 70%” in Table 3 indicates the case where pulverized incinerated ash is used and the other two powders, silica fine powder or There is hardly any difference in the fluidity of cement milk when using mountain clay powder.

However, in the case of "Kunigel V1 in the mixing ratio of the sample B to the powder in the case of 50% to 50%" in Table 4, the other two cases are used in the case of using the incinerated ash (5 times). It is clear that the fluidity of the cement milk is the same even if the amount is increased by 5 to 10 kg as compared with the case using the powder.

Further, in the case of “Kunigel V1 powder in the mixing ratio of the C sample is 30% to 70%” in Table 5, the case using the ground incineration ash is the case using the other two powders. It became clear that even if the amount was increased by 10 to 20 kg, the fluidity of the cement milk was equivalent. Therefore, when these facts are combined, it has been found that in the case of using crushed incineration ash, it is possible to mix a larger amount than in the case of using other fine silica powder or mountain clay powder.

Further, as described above, the present inventors have found that, besides the pulverized incinerated ash (five times), the mixing ratio of the powder to the bentonite is 50: 5 for the fine silica powder and the mountain clay powder.
When the unconfined compressive strength of the cement milk was measured to be 0 and compared with the measured unconfined compressive strength of cement milk using only bentonite as an admixture, the results shown in the following Table 6 were obtained.

[0061]

[Table 6]

As shown in Table 6 above, when pulverized incineration ash (five times) was used as the admixture, uniaxial compression was more difficult than when silica fine powder or mountain clay powder was used as the admixture. It became clear that the strength was large. In addition, it was clarified that the uniaxial compressive strength was slightly higher than when only bentonite was used as the admixture.

The uniaxial strength (average) of the raw incinerated ash powder is as follows:
3.94 kgf / m ² , and the uniaxial strength (average) of the classified incineration ash classified with a 325 mesh sieve is 4.22 kg.
f / cm2. For reference, FIG. 7 shows a graph of an increasing tendency of the uniaxial strength (average) of the particle size adjusted incinerated ash based on the incinerated ash raw powder.

Cement is mixed with cement milk as a hardening material to obtain solidification strength, but the admixture partially contributes to the strength development of cement milk. But,
The contribution ratio of the strength development is different depending on the particle size of the admixture. According to Table 6 above, it is clear that the use of the ground incineration ash as the admixture has a greater strength than the use of any other fine silica powder, mountain clay powder or Kunigel V1 as the admixture. Therefore, when this ground incineration ash is used as an admixture, cement can be reduced, and the cost of cement milk can be further reduced.

As is clear from the above description, when the present invention is practiced, it has become clear that up to about 70% of bentonite can be used as an admixture for cement milk with respect to bentonite. And, when using the crushed incinerated ash, the ratio of incinerated ash to bentonite can be increased, and handling and workability for mixing the incinerated ash into cement milk can be improved. found. It was also found that when the ground incineration ash was mixed with cement milk as an admixture, it was possible to increase the uniaxial compressive strength equal to or more than that of bentonite.

Further, the present inventors conducted a test as to the extent to which the ratio of pulverized incinerated ash to bentonite can be increased as an admixture for cement milk. As a result, the results shown in Table 7 were obtained. Was done.

[0067]

[Table 7]

Further, as the admixture of the cement milk, explanation data for judging to what extent the ratio of pulverized incinerated ash to bentonite (five times) can be increased is shown in Table 8 below. View by. Table 8 shows the required amount of the admixture mixed in the cement milk due to the viscosity of the funnel, particularly the funnel viscosity, in the kneaded cement milk.

[0069]

[Table 8]

Referring to Table 8 above, the required amount of the admixture for obtaining the funnel viscosity on the order of 23 seconds in Table 7 and the required amount of the admixture for obtaining the funnel viscosity on the order of 30 seconds in Table 7 were 40 seconds. As is clear from the required amount of the admixture for obtaining the funnel viscosity of the table, the Kunigel V1 is 30
%, And up to 70% crushed incinerated ash, it is clear that when the amount of crushed incinerated ash is increased by 20%, the necessary amount of the admixture to express each funnel viscosity is 1.5 to 2 times or less. is there.

However, for example, when the kunigel is set to 20% and the pulverized incinerated ash is set to 80%, the necessary amount of the admixture becomes 1.5 at a time despite the pulverized incinerated ash being increased only by 10%.
It turned out to be double.

That is, in order to obtain a funnel viscosity of the order of 23 seconds, 90 kg of the admixture is required.
It is clear that 130 kg of admixture is required to obtain a funnel viscosity on the order of seconds, whereas 150 kg of admixture is required to obtain a funnel viscosity on the order of 40 seconds.

From these facts, it was found that Kunigel V1 was 70%.
%, Ground incineration ash from 30% to Kunigel V1 up to 30%, and ground incineration ash up to 70%, the regular increase in the amount of admixture is established, whereas Kunigel V1 is 20% and ground and incinerated. When the ash content reaches 80%, it is obvious that the regularity is lost, the required amount of the admixture increases at a stroke, and practical application becomes difficult.

[0074]

According to the cement milk of the present invention, the incinerated ash is mixed as an admixture into the cement milk to form the cement milk, so that the incinerated ash conventionally disposed of in large quantities can be effectively used. I can do it. In addition, since this incinerated ash can be replaced with a part of bentonite, there is a great effect that the cost of cement milk can be remarkably reduced.

When the incinerated ash is mixed into the cement milk, it is exposed to a highly alkaline environment in the cement milk to release the soluble silicic acid, and the silicate ions of the liberated soluble silicic acid and the hydrated cement are hydrated. The calcium ion generated in the cement milk undergoes a coagulation reaction, so that the strength of the cement milk can be further increased. Therefore, a greater strength can be obtained than when admixtures such as bentonite, fine silica powder, and mountain clay powder are mixed into cement milk. Therefore, when incinerated ash is used, the amount of cement can be reduced as compared with the case where other bentonite or the like is used.

In particular, when the incinerated ash mixed into the cement milk is less than 10% by weight, the effect of mixing is reduced. On the other hand, when the incinerated ash mixed exceeds 70% by weight,
As can be seen from Table 9 below, in order to obtain a predetermined funnel clay, the total admixture amount of incinerated ash and bentonite must be significantly increased, which is not practical. Therefore,
The amount of incinerated ash mixed in cement milk is 10-70
By setting the percentage by weight, a great effect can be obtained.

The incinerated ash has a brane specific surface area of 7000 cm
When it is 2 / g or more, the uniaxial strength at the time of solidification can be increased. In addition, workability during manufacturing
(Operability) can also be improved.

When the particle size of the incinerated ash mixed in the cement milk is adjusted by pulverization or classification, the specific surface area of the brane can be increased, whereby the uniaxial strength at the time of solidification can be further increased. In addition, there is an effect that workability at the time of manufacturing can be further improved. Furthermore, when the average particle size of the incineration ash mixed with the cement milk is limited to 2 to 20 μm, the specific surface area of the brane can be more reliably increased, thereby further increasing the uniaxial strength during solidification, In addition, there is an effect that workability at the time of manufacturing can be further improved.

When the incinerated ash mixed with the cement milk has a Blaine specific surface area of 9000 cm 2 / g or more, the uniaxial strength at the time of solidification can be further increased, and the workability at the time of production can be further improved. When the Blaine specific surface area exceeds 16000 cm 2 / g, the effect is saturated and the energy consumption required for adjusting the particle size can be increased.

In the present invention, sludge obtained by using a polymer flocculant, for example, without using lime or ferric chloride as a sewage treatment material for flocculating the incinerated ash used, is incinerated. In the case of using materials generated at the time, a large amount of calcium hydroxide that may increase the water absorption rate, such as incineration ash using lime or ferric chloride in the sewage treatment material described above, should be contained. Therefore, there is an effect that there is no fear of forming a cement milk which is inferior in strength and durability.

Further, in the cement milk of the present invention,
When using incinerated ash whose particle size has been adjusted by grinding or classification, workability can be improved, thereby facilitating production and increasing the uniaxial strength of the obtained cement milk during solidification. It has the effect of being able to.

[Brief description of the drawings]

FIG. 1 is a micrograph (1) of an incinerated ash raw powder used in the present invention.
480 times).

FIG. 2 is a photomicrograph of a crushed incinerated ash produced by crushing the incinerated ash used in the present invention three times, at a magnification of 1,490 times.

FIG. 3 is a graph showing the particle size distribution of the crushed incineration ash produced by crushing the incineration ash once.

FIG. 4 is a graph showing the distribution of the particle size of pulverized incineration ash produced by pulverizing three times.

FIG. 5 is a graph showing a particle size distribution produced by pulverizing five times.

FIG. 6 shows the particle size of the blast furnace slag fine powder that has been pulverized and adjusted.

FIG. 7 is a graph showing the relationship between the specific surface area of eco-repellent powder and the rate of increase in uniaxial compressive strength.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) // (C04B 28/04 C04B 18:10) Z 14:10 B09B 3/00 ZABZ 18:10) 5 / 00 N (71) Applicant 000104814 Kunimine Industry Co., Ltd. 1-10-5, Iwamotocho, Chiyoda-ku, Tokyo (72) Inventor Yoshifumi Takahashi 2-6-1, Otemachi, Chiyoda-ku, Tokyo Inside Tokyo Sewer Service Co., Ltd. (72) Inventor Toshiyuki 2-6-2 Otemachi, Chiyoda-ku, Tokyo Tokyo Metropolitan Sewerage Service Co., Ltd. (72) Inventor Koichi Hattori 2-6-1 Otemachi, Chiyoda-ku, Tokyo Tokyo Metropolitan Sewerage Service Inside (72) Inventor Yoshiaki Ishii 5-33-11, Shimbashi, Minato-ku, Tokyo Inside Japan Hume Co., Ltd. (72) Inventor Tetsubo Shibata Nishi, Shinjuku-ku, Tokyo 1-22-2, Haneda Hume Kanko Co., Ltd. (72) Inventor Masaaki Shinno 1-10-5, Iwamotocho, Chiyoda-ku, Tokyo F-term in Kunimine Industry Co., Ltd. 4D004 AA36 BA10 CA04 CB13 DA03 DA20 4D059 AA06 BB01 BK11 BK30 CC10 4G012 PA06 PA26

Claims (7)

[Claims] 1. A cement milk containing bentonite, wherein an admixture of sewage sludge incineration ash is mixed in an amount of 10 to 70% by weight with respect to the bentonite. 2. The sewage sludge incineration ash has a Blaine specific surface area of 70.
The cement milk according to claim 1, wherein the cement milk is 00 cm2 / g. 3. The cement milk according to claim 1, wherein the sewage sludge incineration ash has been subjected to particle size adjustment by pulverization or classification. 4. The sewage sludge incineration ash has an average particle size of 2 to 20 μm.
The cement milk according to claim 3, wherein 5. The incinerated sewage sludge ash has a Blaine specific surface area of 90.
4. The cement milk according to claim 3, wherein the amount is in the range of 00 to 16000 cm2 / g. 6. The cement milk according to claim 1, wherein the sewage sludge incineration ash is obtained by incinerating sludge obtained using a polymer flocculant. 7. A method for producing cement milk, comprising mixing sewage sludge incineration ash whose particle size has been adjusted by means of cement, bentonite, pulverization or classification.