JP2987620B2 - Method of manufacturing ground injection material - Google Patents

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 a material for ground injection in an alkaline region or an acidic region, and more particularly, to a material having good permeability, high compaction strength, low shrinkage and excellent durability. The present invention relates to a method for manufacturing a ground injection material suitable for injection into a wide range of ground.

[0002]

2. Description of the Related Art Conventionally, as a soil injection material for consolidating soft ground or the like, an injection material mainly containing water glass, an injection material mainly containing acidic silica sol composed of water glass and acid, and a colloidal silica as a main material. Injectable materials and the like are known. These injection materials are used as they are or by being injected into the ground together with a reactant such as a consolidating agent and consolidating.

However, these injection materials all contain a large amount of alkali salts or acid radicals. When these alkali salts and acid radicals are contained in a large amount, not only does the strength of the consolidated body decrease, but also the alkali salts and acid radicals are liberated from the consolidated body over a long period of time and the consolidated body shrinks, resulting in poor durability. descend. Further, these injection materials are not preferable from the viewpoint of environmental protection.

In recent years, for the purpose of improving the above-mentioned drawbacks, there has been used a material for soil injection which is made by passing water glass through a cation exchange resin to make contact with the cation exchange resin to remove an alkali component in the water glass and to make the water glass acidic. Have been. The above-mentioned drawbacks are eliminated because this kind of ground injection material has a reduced alkali content.

[0005]

However, in the above-mentioned treatment with a cation exchange resin, when the silica concentration of the water glass is high, the water glass gels while passing through the resin, so that the high silica Not suitable for concentrated water glass treatment. Therefore, although the material for ground injection obtained by such a cation exchange resin treatment is excellent in durability,
Consolidation strength cannot be expected. In this treatment, the treatment of the waste liquid discharged at the time of regeneration of the cation exchange resin becomes a problem.

[0006] Therefore, an object of the present invention is to provide excellent consolidation, high consolidation strength, low shrinkage, and excellent durability, so that it is suitable for injection into a wide range of ground. For ground injection with improved disadvantages in technology
An object of the present invention is to provide a method for manufacturing a material .

[0007]

In order to achieve the above-mentioned object, according to the method of the present invention for producing a material for injecting ground into an alkaline region, water glass is contact-treated with a cation exchange resin to remove the water glass.
When alkalizing, adjust the amount of cation exchange resin
The contact treatment is determined to be equal to or less than the alkali equivalent contained in the solution.
It is characterized in that the pH value of the subsequent water glass is reduced to a pH value in an alkaline region to obtain alkaline activated silicic acid .

Further, in order to achieve the above-mentioned object, according to the method for producing a material for injecting ground into an alkaline region of the present invention,
The water glass is contact-treated with a cation exchange resin to remove alkali, and the pH value of the water glass is reduced to a pH value in an acidic region to obtain an acidic active silicic acid. It is characterized by being added until it reaches the region.

Further, in order to achieve the above-mentioned object,
According to the method for producing a material for ground injection in the acidic region of the present invention,
The water glass is preliminarily used in the alkali glass contained in the water glass.
The alkali glass is de-alkaliated by contact treatment with a cation exchange resin determined in an amount equal to or less than the amount, to lower the pH value of the water glass to a pH value in an alkaline region. It is characterized by adding an acidic material to an acidic region to make it acidic.

Further, in order to achieve the above-mentioned object, according to the method of the present invention for producing a material for injecting ground into an acidic region, an acidic silica sol composed of water glass and an acidic material is contact-treated with an anion exchange resin to form an acid radical. Is removed.

Furthermore, in order to achieve the above-mentioned object,
According to the method for manufacturing a material for ground injection according to the present invention, water glass and an acidic material are prepared as starting raw materials, and a cation exchange resin and an anion exchange resin are separately arranged, and the following steps (a) to (a) are performed. The method is characterized in that one or more of the ground injection materials A to D are manufactured by using (d) alone or in an appropriate combination.

(A) passing water glass through a cation exchange resin, and contacting the water glass with the cation exchange resin;
A step of lowering the pH value of the water glass to a pH value in an alkaline region to obtain an alkaline activated silicic acid, thereby producing a ground injection material A in an alkaline region.

(B) passing the water glass through a cation exchange resin and contacting the water glass with the cation exchange resin;
The pH value of the water glass is lowered to a pH value in an acidic region to obtain an acidic active silicic acid, and water glass is added to the acidic active silicic acid until the active silicic acid becomes an alkaline region to produce a ground-injection material B in an alkaline region. Process.

(C) A step of adding an acidic material to the alkaline activated silicic acid produced in the above step (a) until the alkaline activated silicic acid becomes an acidic region to produce a material C for ground injection in an acidic region.

(D) An acidic silica sol obtained by mixing water glass and an acidic material from an acidic material tank is passed through an anion exchange resin, and the acidic silica sol is contact-treated with an anion exchange resin to remove acid radicals. And manufacturing a material D for injecting ground into an acidic region.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail.

Ground injection material A Water glass is obtained by contacting a water glass with a cation exchange resin and dealkalizing to lower the pH value of the water glass to a pH value in an alkaline region.

The original water glass before the contact treatment with the cation exchange resin is strongly alkaline and has a pH value of about 12. When this is passed through a cation exchange resin and subjected to contact treatment, a considerable amount of Na ions in the water glass is replaced by hydrogen ions, and the pH decreases. If the amount of the cation exchange resin is large relative to the water glass, the pH value in the acidic region will be attained, and if the amount is small, salt removal will be insufficient.

Therefore, in order to lower the pH of the water glass to the alkaline range without transferring the water glass to the acidic range, it is necessary to previously determine the amount of the cation exchange resin so as to stay at the pH in the alkaline range. . Since this amount varies depending on the type and concentration of the water glass and the pH value to be lowered, it is not uniquely determined, but cannot be determined in advance by experiment each time.

The thus obtained soil injection material A in the alkaline region (active silicic acid in the alkaline region) is more unstable and is more likely to gel than the original water glass, but hardens for more than several months if it is longer than several hours. And maintain a stable state. Therefore, the injection material A itself becomes a ground injection material having excellent permeability. In addition, when the pH of the conventional water glass grout in the alkaline region is lowered to a certain value, the conventional acidic silica sol grout is p
When H is set to a certain value or more, the gelation time becomes short and unstable rapidly.

Ground Injection Material B Water glass is contact-treated with a cation exchange resin to remove alkali, and the pH value of the water glass is reduced to a pH value in an acidic region to obtain an acidic active silicic acid. The glass is obtained by adding the active silicic acid until the active silicic acid is in the alkaline region.

Since the ground injection material B is in a state where active silicic acid having a very low alkali content is mixed in water glass, the average molar ratio is extremely large as compared with water glass. In other words, the molar ratio of the water glass is at most up to 4 at most, but the molar ratio of the material B for ground injection reaches 10 or more.

Further, the material for ground injection B can be prepared with a high concentration of SiO ₂ . That is, the concentration of the active silicic acid itself is most SiO ₂ 6% level, is SiO ₂ concentration is increased by this mixing water glass. Moreover, it is considered that this is not formed by mixing active silicic acid and water glass, but to form a homogeneous oligomer by these reactions. Therefore, like the above-mentioned ground injection material A, it does not harden for several hours to several months or more, maintains a stable state, and is itself a ground injection material excellent in permeability.

Ground Injection Material C Water glass is contact-treated with a cation exchange resin to dealkalize, the pH value of the water glass is lowered to a pH value in an alkaline region, and an acidic material is added to the obtained alkaline activated silicic acid.
It is obtained by adding the alkaline activated silicic acid until it becomes an acidic region.

The alkaline activated silicic acid is the above-mentioned material A for ground injection. An acidic material was added to the injection material A to adjust the pH value to 1
~ 3 acidic regions. The material C for ground injection in the acidic region obtained in this way is more stable than the acidic silica sol obtained from the water glass and the acidic material.

The acidic material used here is sulfuric acid,
Examples include inorganic acids such as hydrochloric acid and phosphoric acid, and salts exhibiting acidity such as aluminum chloride and sodium hydrogen sulfate. These may be used alone or in combination of two or more.

In the above-mentioned soil injection material C, since the soil injection material A (alkaline activated silicic acid) used as a raw material has a small alkali content in the production, the amount of the acidic material used is extremely small as compared with the conventional acidic silica sol. I'm done. Therefore, the material C for ground injection has a low content of acid radicals, and the physical properties as grout are improved.

Each of the above-mentioned materials A, B and C for injecting ground contains a step of subjecting water glass to a contact treatment with a cation exchange resin to remove alkali, and therefore, a conventional water glass grout,
Compared with acidic silica sol grout and the like, the content of salts and acid radicals is extremely small. Therefore, all of them can be expected to have high compaction strength, low shrinkage, excellent permeability, and particularly excellent durability, and are preferable from the viewpoint of environmental protection.

Ground Injection Material D Obtained by contacting an acidic silica sol composed of water glass and an acidic material with an anion exchange resin to remove acid radicals.

The above-mentioned acidic silica sol composed of water glass and an acidic material usually exhibits strong acidity and contains a relatively large amount of acid radical. When such an acidic silica sol is treated with an anion exchange resin to increase the pH value in the acidic region, the obtained soil consolidating material D has a lower content of acid radicals than the conventional acidic silica sol and is stable. , Which itself becomes a material for ground injection with excellent permeability.

[0031] Here, the acidic material used is a salt such as exhibiting similar to those described above inorganic acids, acidic.

Ground Injection Material E The above-mentioned ground injection materials A, B, C and D can be obtained by containing a reactant respectively. As described above, all of the ground injection materials A, B, C, and D are relatively stable and have a long gelation time. Therefore, depending on the ground to be injected, a reactant is added to each of these injection materials to form a gel. Time
In addition, strengthening the consolidation strength, further reduce the gel shrinkage,
If it is, the durability can be improved. Since these gels have a small amount of eluted matter, they are also preferable in terms of water quality conservation and environmental conservation.

The reactant used here is a reactant applied to gelation of water glass, and specifically, phosphoric acid, alkali metal hydrogen sulfate, alkali metal hydrogen carbonate, cement, slag, etc. Is mentioned.

The amount of such a reactant used is very small because the content of sodium, acid radical and the like of the above-mentioned injectable materials A, B, C and D to be added is small.

Manufacture of Ground Injection Materials The ground injection materials A, B, C, D and E according to the present invention are manufactured by arbitrarily combining one or more of these materials based on the manufacturing apparatus shown in FIG. Is done.

As shown in FIG. 1, first, water glass, an acidic material, and a reactant are respectively stored and arranged in, for example, a storage tank as a starting material, and further, a cation exchange resin and an anion exchange resin are respectively contained. Filling in a resin tank to form an apparatus for manufacturing ground injection material.

Next, the following (a) to (a)
By performing the process shown in (e), the materials A, B,
It is manufactured by combining one or more of C, D and E.

(A) The water glass from the water glass tank is introduced into and passed through the cation exchange resin tank , the water glass is contact-treated with the cation exchange resin, and the pH value of the water glass is adjusted to the pH in the alkaline region. Producing a material A for injecting ground into an alkaline region by reducing the value to alkaline activated silicic acid.

(B) The water glass from the water glass tank is introduced into and passed through the cation exchange resin tank , and the water glass is contact-treated with the cation exchange resin to adjust the pH value of the water glass to the pH value in the acidic region. Producing a material B for ground injection in an alkaline region by adding the water glass from the water glass tank to the acidic active silicic acid until the active silicic acid becomes an alkaline region.

(C) To the alkaline activated silicic acid produced in the step (a), an acidic material from an acidic material tank is added until the alkaline activated silicic acid becomes an acidic region to produce a material C for ground injection in an acidic region. Process.

(D) An acidic silica sol obtained by mixing water glass from a water glass tank and an acidic material from an acidic material tank is introduced into and passed through an anion exchange resin tank. A step of producing a material D for injecting ground into an acidic region by removing the acid radicals by contact treatment.

(E) The reactant from the reactant tank is added to (a)
To (A), (B), and (C)
A process of manufacturing the ground-injection material E by adding and containing it to D and D.

In FIG. 1, a neutralizing agent tank in which a neutralizing agent such as an acid or an alkali is stored is further disposed, and the neutralizing agent from the neutralizing agent tank is supplied to a cation exchange resin tower or an anion exchange resin. The cation exchange resin and the anion exchange resin can be regenerated by being introduced into a tank and passed therethrough.

Further, in FIG. 1, the treatment waste liquid generated from the regeneration treatment of the cation exchange resin or the anion exchange resin is neutralized with a neutralizing agent from a neutralizing agent tank and discharged to prevent pollution. Can also be prevented. In this case, since the effluent of the cation exchange resin is an alkali and the effluent of the anion exchange resin is an acid, if these are mixed, they are neutralized spontaneously. The amount of used is very small. Further, although not shown in the manufacturing process of FIG. 1, it is needless to say that a pH detector, a controller and the like can be installed and automated.

[0045]

The present invention will be described below in detail with reference to examples, but the present invention is not limited to these examples.

1. Materials Used (1) water glass gravity _{(20 ℃) 1.39, SiO 2} 29.2%, Na 2 O9.
5%, JIS No. 3 water glass with a molar ratio of 3.17 is used.

(2) Acidic material 75% industrial sulfuric acid is used.

(3) Activated silicic acid 17.5% aqueous glass solution passed through a cation exchange resin, pH 2.7, specific gravity 1.03, SiO ₂ 5.0
%, 0.2% Na ₂ O activated silica. 1.5 times at room temperature for gelation
It takes ~ 2 days.

(4) Reactants Phosphoric acid, sodium hydrogen sulfate, sodium hydrogen carbonate and cement are used as reactants for suspended grout.

(A) Phosphoric acid 75% Industrial phosphoric acid H ₃ PO ₄

(B) Sodium bisulfate reagent primary grade NaHSO ₄ .H ₂ O

(C) Sodium bicarbonate reagent primary NaHCO ₃

(D) Cement Portland cement

2. Measurement method (1) pH Measured with a glass electrode pH meter.

(2) Gelation time Measured by the inverted cup method.

(3) Sandgel Uniaxial Compressive Strength A sandgel made of Toyoura standard sand was sealed and cured with polyvinylidene chloride, and the strength was measured in accordance with the standard of the Japan Society of Soil Engineering, "Uniaxial compressive test method for soil".

(4) Shrinkage of homogel The homogel was placed at 20 ° C. in a closed container made of polypropylene resin.
At 10 ° C. for 10 days.

3. Examples and Comparative Examples (1) Ground Injection Material A A ground injection material in an alkaline region obtained by treating a water glass aqueous solution with a cation exchange resin. The water glass solution and the cation exchange resin are shaken and mixed for about 2 minutes. After mixing, the resin and the treatment liquid (A) are separated.

The mixing ratio, the pH of the treatment solution, and the gel time at 20 ° C. were measured. Table 1 shows the results.

[0060]

[Table 1]

Table 2 shows examples of gelation times of conventional water glass-based grout and acidic silica sol-based grout in the alkaline region as reference examples.

[0062]

[Table 2]

From Table 1, it can be seen that in Comparative Examples Nos. 1 and 2 in which the pH of the mixed solution was in the neutral to acidic range, the gelation time was very fast, but Example No. 2 in the alkaline range according to the present invention was used. 1,
The gelation times of 2, 3, and 4 are as long as several tens of days to several tens of hours and stabilized. Therefore, sufficient permeation can be achieved by lengthening the gelling time.

In Table 2, the water glass-phosphoric acid system (Reference Examples 1 and 2) and the acidic silica sol-water glass system (Reference Examples 3 and 4) are the same as those of the present invention. Even though the gelation time is very short, pH
The fluctuations due to are also remarkable and unstable.

(2) Ground Injection Material B This is a ground injection material obtained by adding a water glass liquid to activated silicic acid and transferring the active glass to an alkaline region. Table 3 shows the mixing ratio of the activated silicic acid and the water glass solution, the SiO ₂ concentration, the Na ₂ O (Na content is converted to Na ₂ O) concentration, the molar ratio, the pH, and the gelation time at 20 ° C. of the mixed solution.

[0066]

[Table 3]

In Table 3, Comparative Example No. 3 was activated silicic acid alone, and when water glass was added thereto, the pH rapidly increased, and the pH was increased more than a certain amount to reach an alkaline region (Example No. 3). 5, 6, 7, 8), the gelation time is prolonged remarkably and stabilized. However, unlike water glass, most harden after a long time.

In addition, since the amount of water glass added was small and the pH did not reach the alkaline range, the pH was slightly acidic to neutral (Comparative Example No.
4), gels early. Not only the SiO ₂ concentration, but also the addition ratio of water glass increases, the concentration increases, leading to an increase in strength after consolidation. However, if the amount of water glass is too large, the effect as active silicic acid may hardly be exhibited.

(3) Ground Injection Material C This is a ground injection material that has been transferred to an acidic region by using the above-described ground injection material A and an acidic material together. Mixing ratio of injection material A and sulfuric acid as acidic material, pH of mixed solution, 20 ° C
The gelation time and shrinkage of the homogel were measured. Table 4 shows the results.

[0070]

[Table 4]

In Table 4, the SiO ₂ concentration was set to about 7% for comparison. Examples No. 9, 10, according to the present invention
Compared with Comparative Example No. 5, which is a conventional acidic silica sol, 11 and 12 use less sulfuric acid, keep the gelation time longer, can expect a sufficient penetration effect, and reduce the shrinkage of the homogel. ing. Further, the content of SO ₄ is small, which is preferable from the viewpoint of environmental protection.

(4) Ground injection material D This is a ground injection material in an acidic region obtained by treating a conventional acidic silica sol with an anion exchange resin.

About 2 parts of acidic silica sol and anion exchange resin
Mix by shaking for a minute. After mixing, the resin and the treatment liquid (D) are separated. The mixing ratio of the acidic silica sol and the anion exchange resin, the pH of the treatment solution, and the gel time at 20 ° C. were measured. The results are shown in Table 5. Note that Na ₂ O, S
The amount of O ₄ is also shown (Na ₂ O was converted from Na amount to Na ₂ O). Acid silica sol is 240 g of water glass, sulfuric acid 5
One having a composition of 2 g and 708 g of water was used.

[0074]

[Table 5]

Comparative Example No. 6 in Table 5 is an acidic silica sol itself, which was treated with an anion exchange resin in Example No. 1
3 When treated with an anion exchange resin, SO ₄ decreases and the pH increases.

Compared to the acidic silica sol of Comparative Example No. 6,
The gelation time is very long and stabilized, and the gel is always gelled after a long time even in soil, and the gel shrinks less. That is, a remarkable penetration effect can be expected. Further, since the content of SO ₄ is small, it is preferable from the viewpoint of environmental protection.

(4) Ground Injection Material E The above ground injection materials A, B, C, and D all have a relatively long gelation time, are stabilized, and are firmly consolidated. I can't wait.

Depending on the ground to be injected, it may be desired to further accelerate gelation to increase the strength and reduce gel shrinkage. Therefore, a reactant is added to the injection materials A, B, C, and D to achieve the object as the ground injection material E.

Table 6 shows the composition, pH of the mixture, gel time, uniaxial compressive strength of sand gel, and shrinkage of homogel, using conventional water glass-reactant grout and acidic silica sol grout as controls.

[0080]

[Table 6]

In Table 6, in order to compare the example and the comparative example, the SiO ₂ concentration is substantially the same in both cases. Comparative Example No. 7 water glass-phosphoric acid system, Comparative Example No. 8 water glass-
Examples Nos. 14, 15 and 15 in comparison with the sodium hydrogen sulfate system
In the systems of A and Phosphoric Acid and B and Sodium Bisulfate 16, 17, the amount of the reactant (phosphoric acid and sodium hydrogen sulfate) used in this case is extremely small. Further, both the compaction strength and the shrinkage ratio are much better.

Compared with the conventional acidic silica sol-sodium bicarbonate system of Comparative Example No. 9, the reactants (in this case, The amount of sodium bicarbonate) is extremely small, and the consolidation strength and shrinkage are much better.

When cement was used as the reactant, the system comprising A and cement of the present invention (Examples Nos. 20 and 21) was far more than the conventional water glass-cement system (Comparative Example No. 10). Excellent consolidation strength.

As described above, the effects of the injection materials A to E are exhibited because the cations and acid radicals are reduced mainly by the treatment with the ion exchange resin. Further, a small shrinkage is preferable from the viewpoint of environmental protection because a deviation of syneresis water is reduced.

(5) Method of Manufacturing Ground Injection Materials A to E The ground injection materials A to E of the present invention are characterized by being based on ion exchange resin treatment. As shown in FIG. 1, a water glass aqueous solution, an acidic material solution, a reactant solution (including a cement type suspension) and an acid / alkali solution for neutralizing waste water of regeneration treatment of an ion exchange resin are prepared as material systems. Keep it.

The amount of resin and the change in pH of the water glass solution in the cation exchange resin treatment of the water glass are set in advance on a trial basis, and based on the results, the aqueous solution of the water glass is treated with the cation exchange resin. The pH is lowered to a desired pH in the alkaline region, and the injection material A is separated and collected.

Further, an active silicic acid is prepared by lowering the pH to an acidic range, and water glass is added to the active silicic acid until the pH reaches an alkaline range to produce an injection material B.

For the cation exchange resin treatment, it is sufficient that the resin and the aqueous solution of water glass are sufficiently brought into contact using an ordinary mixing tank. A tower type resin tank can also be used.

Further, an acidic material liquid was added to the material A for injection, and p
H is reduced to an acidic region to produce C.

Further, a normal acidic silica sol is prepared by mixing a water glass aqueous solution and an acidic material liquid, and the relationship between this and the amount of anion exchange resin is previously set experimentally in advance as described above. As a standard, an acidic silica sol and an anion exchange resin are mixed and brought into contact with each other, and the treatment liquid is separated and collected as an injection material D.

The treated cation exchange resin is subjected to a regeneration treatment with an acid solution for neutralization, and the anion exchange resin is subjected to a regeneration treatment with an alkali solution for neutralization. Is discharged by neutralizing with a neutralizing acid / alkali solution. Acid discharged at this time,
Since the alkalis can be neutralized, the amount of acid and alkali for neutralization can be reduced.

Although not shown in FIG. 1, it is necessary to alternately perform the ion exchange reaction and the regeneration treatment on the ion exchange resin. Therefore, a plurality of ion exchange resin tanks are provided so that the ion exchange reaction can always be performed. As a matter of course, it is also conceivable to install a pH detector and a controller to partially or fully automate the entire process.

Since the above-mentioned materials A to D for injecting ground generally show a long gelation time, they can be injected into the ground as permeable grout as they are, thereby exhibiting a remarkable effect. Further, a reactant liquid (including a cement-based suspension or the like) is mixed with A to D and injected into the ground as a ground injection material (E) adapted to the ground to be injected.

As described above, in the production of the present invention, these steps are combined into one system to freely produce the injection materials A to E adapted to the ground to be injected, and at the same time, neutralize the waste liquid by regenerating the resin. Perform processing.

[0095]

The method for producing a ground injection material according to the present invention, which mainly focuses on ion exchange resin treatment, can provide the following effects as compared with conventional water glass-based and acidic silica sol-based ground injection materials. It is.

1. It shows excellent permeability, compaction strength and low shrinkage, and can be expected to have excellent durability.

2. Very small amounts of the acidic material and the reactant required for the production are sufficient.

3. Since the content of Na and acid groups is small and the solidification property is good, there is little water pollution and the environment is excellent.

4. It can be manufactured by systematically combining ground injection materials suitable for a wide range of grounds to be injected, including ion exchange resin treatment, including waste liquid treatment.

[Brief description of the drawings]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram showing ground injection materials A, B,
It is a systematic manufacturing process figure of C, D, and E.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification symbol FI // C09K 103: 00 (56) References JP-A-11-61124 (JP, A) JP-A-60-20992 (JP, A (58) Fields surveyed (Int. Cl. ⁶ , DB name) C09K 17/12 C09K 17/02 C09K 17/08 C09K 17/10 E02D 3/12 101

Claims (11)

(57) [Claims] When the water glass is contact-treated with a cation exchange resin to remove alkali, the amount of the cation exchange resin is determined in advance.
Determined to be equal to or less than the alkali equivalent contained in the water glass,
It is characterized in that the pH value of the water glass after the contact treatment is lowered to a pH value in the alkaline region to make it an alkaline activated silicic acid.
For producing a material for injecting ground into an alkaline region. 2. The water glass is contacted with a cation exchange resin to remove alkali, and the pH value of the water glass is reduced to a pH value in an acidic region to obtain an acidic active silicic acid. A method for producing a material for injecting ground into an alkaline region, wherein the active silicic acid is added until the active silicic acid reaches the alkaline region. 3. The method for producing a ground injection material according to claim 1, wherein the ground injection material according to claim 1 or 2 further comprises a reactant. 4. The material for ground injection according to claim 3, wherein the reactant is a reactant applied to water glass.
Manufacturing method . 5. The method of claim 3, reactants phosphate method for producing a ground injection timber according to claim 3 selected from the group of hydrogen sulfate alkali metal salts, alkali metal bicarbonate, cement and slag. 6. The water glass is previously contained in the water glass.
The alkali glass is de-alkaliized by a contact treatment with a cation exchange resin determined to an amount equal to or less than the alkali equivalent to lower the pH value of the water glass to a pH value in an alkaline region. It is characterized by adding an acidic material until the silicic acid is in the acidic region to make it acidic.
A method for producing a material for ground injection in an acidic region . 7. An acid obtained by mixing water glass and an acidic material.
Pass through the anion exchange resin,
Contact treatment of silica sol with anion exchange resin to remove acid radicals
Of soil injection material for acidic area characterized by removing
How . 8. The method for producing a ground injection material according to claim 6, wherein the ground injection material according to claim 6 or 7 further comprises a reactant. 9. The material for ground injection according to claim 8, wherein the reactant is a reactant applied to water glass.
Manufacturing method . 10. The method according to claim 8, wherein the reactant is phosphoric acid,
The method for producing a ground injection material according to claim 8, wherein the material is selected from the group consisting of alkali metal hydrogen sulfate, alkali metal hydrogen carbonate, cement and slag. 11. The method of claim 6 or 7, the manufacturing method of the ground infusion timber according to claim 6 or 7 acidic material is an inorganic acid and / or acidic salt.