KR100588488B1 - Pulpsludge ash composite for producing construction materials - Google Patents

Abstract

The pulp sludge produced by incineration of pulp sludge produced in the papermaking process can be added to modified pulp sludge ash with acidic groups so that rapid curing can be achieved within one hour without performing a separate plastic sintering process. Disclosed is a pulp sludge ash composition for producing building materials, including aggregates, lightweight aggregates, to obtain compositions having excellent strength and water resistance. The modified sodium silicate was modified in water resistance by adding an acidic solution to sodium silicate, and the acidic aqueous solution was sodium sulfate, copper sulfate, aluminum sulfate, magnesium sulfate, chromium alum, sulfuric acid aqueous solution, and the like. Oil, gum arabic, acrylic, epoxy and the like can be used. Such compositions not only provide compositions that are easy to produce and very economical, but can also contribute to waste resource recycling and environmental protection.

Pulp sludge ash, acidic aqueous solution, sodium silicate, building materials

Description

PULPSLUDGE ASH COMPOSITE FOR PRODUCING CONSTRUCTION MATERIALS}

1 is a photograph of compositions prepared according to various embodiments of the present invention.

The present invention relates to a pulp sludge ash composition for manufacturing building materials, and more particularly, by adding modified sodium silicate having an acid group to pulp sludge ash generated by incineration of pulp sludge generated after wastewater treatment in a papermaking process. The present invention relates to a pulp sludge ash composition for preparing building materials, which can be obtained not only quickly but also without curing, to which polymer emulsion is added to have excellent strength and water resistance.

In general, the amount of pulp sludge generated after the wastewater treatment of the papermaking process is very large, and most of them have been buried in the landfill, but because the water content of the pulp sludge itself is large, it is not easily hardened and unsuitable as a landfill of the landfill. It is a situation of dumping at sea.

In order to solve this problem, a method of incineration of pulp sludge to recover thermal energy and further reducing the amount of waste generated is being attempted, and the pulp sludge ash generated at this time has no economically available method. Likewise, it is used only in extremely limited cases.

In addition, studies on the use of pulp sludge ash are continuing, one example of which is a method of manufacturing a building material using the paper sludge incineration disclosed in the Republic of Korea Patent No. 1989-0002566. The patent discloses a method of manufacturing building materials by adding slaked lime, asbestos, paper sludge, etc. to pulp sludge ash, preliminarily combining sodium silicate, and steam curing at high temperature and high pressure. In the above production method, however, sodium silicate is added to the pulp sludge ash, which has the effect of performing a hardening reaction with the metal oxide to perform the initial molding quickly. However, since the silicate itself is inferior in water resistance, the pulp sludge ash is hardened in the air after curing. As moisture or water is absorbed, the bonding strength is weakened. In addition, steam curing at high temperature is a problem that is not widely used in industry due to low economic efficiency.

Therefore, there has been a continuous demand in the industry for a method for producing pulp sludge ash and a composition having excellent bonding strength, water resistance, and economic efficiency as a method for recycling pulp sludge.

An object of the present invention is to solve the above problems, by adding a modified sodium silicate having an acid group to the pulp sludge ash, it is quickly cured without a separate plastic sintering curing process and excellent strength and water resistance construction It is to provide a pulp sludge ash composition for manufacturing materials.

Another object of the present invention is to provide a pulp sludge ash composition for building materials, which can significantly reduce water absorption by using modified sodium silicate to improve water resistance.

Still another object of the present invention is to provide a pulp sludge ash composition for manufacturing building materials, which can further increase strength or greatly reduce specific gravity by adding together aggregate or lightweight aggregate to modified sodium silicate including acidic groups.

In order to achieve the above object, the pulp sludge ash composition for manufacturing building materials according to the present invention is characterized by producing a mixture of pulp sludge ash and modified sodium silicate having an acidic group.

A pulp sludge ash for building materials according to the present invention is characterized in that it is prepared by mixing a modified sodium silicate having an acidic group mixed with a polymer emulsion.

The modified sodium silicate having the acidic group is mixed with sodium silicate, any one of sodium sulfate, copper sulfate, iron sulfate, aluminum sulfate, magnesium sulfate, bichromate, chromium alum, sulfuric acid, aqueous hydrochloric acid solution, and a mixture thereof. It is characterized in that it is prepared by adding caustic soda.

The modified sodium silicate having the acidic group is prepared by adding copper sulfate, sodium sulfate, caustic soda and chromium aqueous solution to sodium agitator in a stirrer and stirring.

The modified sodium silicate having the acidic group is prepared by putting sodium silicate, 10% aqueous sodium lauryl sulfate solution, caustic soda and sulfuric acid solution in a stirrer and stirring.

The polymer emulsion is characterized in that the selected one of the latex, silicone resin, gum arabic, acrylic and epoxy.

The mixing ratio of the pulp sludge ash and the modified sodium silicate having an acid group is 1: 1.2 to 2.

In order to increase the strength, it is characterized by adding any one selected from dust, fly ash, sand, slag and foundry sand.

In order to lower the specific gravity, it is characterized by adding any one selected from the powder formed from wood powder, pearlite, vermiculite, styrofoam particles and foaming agent.

In order to have a uniform distribution when adding the additives, it is characterized in that the addition of organobentonite or methyl cellulose.

In order to improve the bending strength, to the composition, it is characterized in that additionally added any one selected from wire mesh, waste fibers and fiber fibers.

In the present invention, when an acidic aqueous solution is added to the pulp sludge ash, it is usually found to be cured quickly within 1 hour, and sodium sulfate, copper sulfate, iron sulfate, aluminum sulfate, magnesium sulfate, carbochromate, chromium alum, and sulfuric acid for strength improvement of the composition. Sodium silicate was added to an acid solution such as aqueous hydrochloric acid solution to obtain a modified sodium silicate. At this time, caustic soda (sodium hydroxide) is added together as a catalyst to assist the mixing of the pulp sludge ash and the acidic aqueous solution.

The modified sodium silicate contains an acidic group, thereby rapidly curing the pulp sludge ash and improving water resistance than general sodium silicate.

The acidic aqueous solution used for the modified sodium silicate is an acidic aqueous solution having a pH of 7 or less, such as sodium sulfate, copper sulfate, iron sulfate, aluminum sulfate, magnesium sulfate, bichromate, chromium alum, sulfuric acid, hydrochloric acid, and their mixed solutions. Can be used.

Modified sodium silicate can be prepared by various mixing of the acidic aqueous solution, but preferably having the following configuration can maximize the water resistance improvement.

(1) modified sodium silicate 1

Sodium silicate, copper sulfate, sodium sulfate, and chromium alum were each accommodated in warm water, put in a stirrer at a mixing ratio of 30: 4: 3: 20, and caustic soda was added together at the same ratio as chromium alum, followed by stirring for 30 minutes. It is a modified silicon silicate having one acidic group.

(2) Modified Sodium Silicate 2

10% aqueous sodium lauryl sulfate and caustic soda were added to sodium silicate and stirred for 30 minutes, and then reformed sodium silicate having an acidic group obtained by stirring the aqueous sulfuric acid solution again. In this case, the mixing ratio of the sodium silicate, sodium lauryl sulfate 10% solution, caustic soda and sulfuric acid solution is preferably 10: 3: 10: 3.

Modified sodium silicate having an acid group prepared as described above is added to the pulp sludge ash to prepare a composition for manufacturing building materials according to the present invention. At this time, the size of the pulp sludge ash is preferably finer than 150 mesh particles, and the mixing ratio of the pulp sludge ash and the modified sodium silicate is preferably 1: 1.2 to 2.

In addition, as a composition according to the present invention, the cement-like composition composed of pulp sludge ash and modified sodium silicate having acidic groups further improves water resistance, prevents deformation such as shrinkage, further increases strength, or adjusts specific gravity to low. Various additives may be added in order to improve the bending strength or to improve the bending strength.

That is, to further improve the water resistance, a polymer emulsion such as latex, silicone oil, gum arabic, acrylic, epoxy, etc. may be selectively mixed with the modified sodium silicate having an acidic group.

For example, 100 g of the <modified sodium silicate 1> having the acidic group may be added to the pulp sludge ash after mixing and stirring 3 to 25 g of the latex in the polymer emulsion, wherein the amount of the latex is 25 g or more. It cannot be cured.

In addition, the mixture may be added to pulp sludge ash after mixing and stirring 0.3-15 g of silicone oil to 100 g of the <modified sodium silicate 1> having the acidic group. Can't.

In addition, agitation 5 ~ 15g and 0.5 ~ 3g gum arabic to 100g of the <modified sodium silicate 1> having the acidic group can be added to the pulp sludge ash, when the gum gum addition amount is more than 15g, the rapid curing Can't

In addition, 5-25 g of acrylic and 0.5-3 g of silicone oil may be added to 100 g of the <modified sodium silicate 1> having the acidic group, and then added to the pulp sludge ash. There is no

In order to prevent deformation such as shrinkage, a metal oxide such as calcium carbonate, lime, magnesium oxide, zinc oxide, or the like may be added to the cement-like composition composed of pulp sludge ash and modified sodium silicate having acidic groups.

In order to increase the strength, various dusts, fly ash, sand, slag, foundry sand and the like can be added to the cement-like composition composed of pulp sludge ash and modified sodium silicate having acidic groups.

In order to lower the specific gravity, a lightweight aggregate such as wood flour, pearlite, vermiculite, styrofoam particles, etc. may be used in the cement type composition composed of the pulp sludge ash and modified sodium silicate having an acidic group, or the vegetable foaming agent may be compressed air. The obtained bubbles may be added. In the case of adding such light aggregates or bubbles, thickeners such as organobentonite or methyl cellulose may be additionally added for uniform blending.

 In addition, in order to improve the bending strength, wire mesh, waste fibers, fiber fibers and the like may be added to the cement-like composition composed of pulp sludge ash and modified sodium silicate having acidic groups.

Hereinafter, an example of a cement composition composed of the pulp sludge ash of the present invention and modified sodium silicate having an acid group will be described, and the results of each test were compared.

<Example 1>

Prepare 60 parts of pulp sludge ash, add 1 g of sodium silicate to 200 g of copper sulfate, 150 g of sodium sulfate, 1,000 g of caustic soda, and 1,000 g of chromium alum in an agitator for 30 minutes and stir the obtained acid solution. 85 parts of modified sodium silicate having groups were prepared. The cement-like composition is obtained by mixing 85 parts of the modified sodium silicate with 60 parts of the pulp sludge ash.

After the obtained pulp sludge ash composition was injected into a cylindrical mold having a diameter of 50 mm and a depth of 100 mm, and a rod having a diameter of 10 mm having a weight of 1 kg was placed over time, the curing state without physical surface change and demoulding and handling was confirmed as the initial curing completion time. The demolded composition was naturally cured for 7 days to measure the weight and strength of the composition, immersed in a water bath for 24 hours, and then lifted and dried for 1 hour to determine the absorbency and strength of the composition.

<Example 2>

60 parts of pulp sludge ash was prepared, a modified silicic acid containing acid group obtained by adding 300 g of 10% aqueous sodium lauryl sulfate solution and 1,000 g of aqueous sodium hydroxide solution to 1,000 g of sodium silicate and then stirring 300 g of 10% aqueous sulfuric acid solution again after stirring for 30 minutes. Prepare 85 copies of soda. 85 parts of the modified sodium silicate is added to 60 parts of the pulp sludge ash to obtain a cement type composition.

Experimental method for the composition obtained in Example 2 is the same as in Example 1 above and the results are shown in Table 1.

<Example 3>

Prepare 60 parts of pulp sludge ash, add 1 g of sodium silicate to 200 g of copper sulfate, 150 g of sodium sulfate, 1,000 g of caustic soda, and 1,000 g of chromium alum in an agitator for 30 minutes, stir for 30 minutes, and add 30 g of latex to 1,000 g of the obtained acid solution. 85 parts of a modified sodium silicate having an acidic group obtained by stirring 3 g of silicone oil were prepared. 85 parts of the modified sodium silicate is added to 60 parts of the pulp sludge ash to obtain a cement type composition.

Experimental method for the composition obtained in Example 3 is the same as in Example 1 above and the results are shown in Table 1.

<Example 4>

60 parts of pulp sludge ash is prepared, and each of aqueous solutions of 1,500 g of sodium silicate, 200 g of copper sulfate, 150 g of sodium sulfate, 1,000 g of caustic soda, and 1,000 g of chromium alum are added to the stirrer and stirred for 30 minutes. 85 parts of a modified sodium silicate having an acidic group obtained by stirring was prepared. 85 parts of the modified sodium silicate is added to 60 parts of the pulp sludge ash to obtain a cement type composition.

Experimental method for the composition obtained by Example 4 is the same as in Example 1 above and the results are shown in Table 1.

Example 5

60 parts of pulp sludge ash was prepared, and each of aqueous solutions of 1,500 g of sodium silicate, 200 g of copper sulfate, 150 g of sodium sulfate, 1,000 g of caustic soda, and 1,000 g of chromium alum were added to a stirrer and stirred for 30 minutes. 85 parts of a modified sodium silicate having an acidic group obtained by stirring 30 g and 3 g of silicon oil are prepared. 85 parts of the modified sodium silicate is added to 60 parts of the pulp sludge ash to obtain a cement type composition.

Experimental method for the composition obtained by Example 5 is the same as in Example 1 above, the results are shown in Table 1.

Comparative Example

60 parts of pulp sludge ash was added to prepare 100 parts of general sodium silicate liquid.

Experimental method for the composition obtained by the comparative example is the same as in Example 1 and the results are shown in Table 1.

Physical property test results of compositions consisting of pulp sludge ash and modified sodium silicate Sample Name Curing time (minutes) Weight before immersion (g) Weight after deposition (g) Strength before deposition (Kg / ㎠)  Strength after deposition (Kg / ㎠) Example 1 21 301.6 358.9 93 89 Example 2 19 303.0 360.6 87 85 Example 3 32 302.1 311.6 118 104 Example 4 43 301.4 310.4 117 110 Example 5 36 301.5 320.0 135 130 Comparative example 280 348.4 351.2 136 0

As can be seen in Table 1, the addition of the sodium silicate having an acidic group to the pulp sludge ash can be obtained as a composition in the state that can be demoulded and transported by rapid curing within 1 hour can be mass-produced In the water tank deposition test, the sample without the polymer emulsion had a high absorption rate and a relatively low strength, but the water resistance was excellent by adding the polymer emulsion. On the other hand, in the comparative example composed of general sodium silicate, the composition could not be obtained by rapid curing, cracks and deformations occurred on the surface during drying, and the water resistance was weak, so that dissolution occurred in the water tank deposition and the strength after deposition could be measured. It was found to be insufficient for industrial use.

In addition, after the composition is cured to improve the water resistance, even if a polymer emulsion is applied to the surface of the composition, the water resistance can be expressed.

Herein, in order to know whether harmful heavy metals contained in the pulp sludge ash are eluted from the composition, each of the pulp sludge ash and each of the compositions crushed after the compressive strength of the above embodiments was confirmed according to the waste process test method. Appeared together.

Heavy metal dissolution test results of the composition according to the invention division pH Result value (ppm) Pb Cu As Hg CD Cr Zn Ni Mn Environmental standard value 7 3 3 1.5 0.005 0.3 1.5 3 3 3 Pulp Sludge Ash 5.8 52 43 0.01 ND 0.2 10 206 13 16 Example 1 10.5 0.03 0.01 ND ND ND ND 0.4 ND ND Example 2 10.1 ND ND ND ND ND ND ND ND ND Example 3 10.3 16 8 ND ND ND 0.04 34 0.01 0.02 Example 4 10.4 ND ND ND ND ND ND O.O3 ND 0.04 Example 5 10.0 ND ND ND ND ND ND 0.02 ND 0.01 Comparative Example 11.5 1.4 0.6 ND ND ND O.O3 3.5 ND 1.8

As can be seen from Table 2, the pulp sludge ash contains a large amount of heavy metals such as lead and zinc, but in the composition composed of modified sodium silicate having an acidic group of the present invention, heavy metals of environmental concern standards are hardly eluted, and comparative examples It was found that the composition elutes. From these results, it can be seen that the cement composition of the present invention can obtain a composition which does not readily cure and eluate, and thus can solidify other heavy metal-containing industrial wastes other than the composition method of the present invention or constitute a useful composition for the industry. Can be.

Hereinafter, embodiments in which various additives are added as necessary to a cement composition prepared by mixing pulp sludge ash with modified sodium silicate having an acid group will be described.

Example 6 Example in which fly ash was further added

In 60 parts of pulp sludge ash, 1,500 g of sodium silicate No. 3, 200 g of copper sulfate, 150 g of sodium sulfate, 1,000 g of caustic soda, and 1,000 g of chromium alum were put in hot water, stirred in a stirrer for 30 minutes, and the polymer was added to 1,000 g of the obtained acid solution. 30 parts of fly ash was further added to the cement-type composition which mixed 130 g of modified sodium silicates which have the acidic group obtained by stirring 100 g of emulsion latex and 3 g of silicone oil to prepare a composition.

The composition was injected into a cylindrical mold having a diameter of 100 mm and a depth of 200 mm, and a rod having a diameter of 10 mm having a weight of 1 kg was placed over time to confirm the curing state without change in physical surface without any change in physical surface as the initial curing completion time, and then the demolded composition After three days of natural curing, the weight and strength of the composition were measured, and the result of confirming the absorbency and strength of the composition by measuring the weight and strength by lifting after 24 hours of deposition in a water bath is shown in Table 3.

Example 7 Example in which steelmaking dust was further added

100 parts of steelmaking dust generated in the steelmaking process were added to a cement-type composition in which 60 parts of pulp sludge ash was mixed with 120 parts of modified sodium silicate having an acidic group obtained by the method of Example 6 to prepare a composition. Table 3 shows the results measured according to the measurement method of Example 6.

Example 8 Example in which iron powder was further added

To 60 parts of pulp sludge ash was mixed with 120 parts of modified sodium silicate having acidic groups obtained by the method of Example 6, 300 parts of iron produced after iron plate surface treatment were further added to prepare a composition. Table 3 shows the results measured according to the measurement method of Example 6.

Example 9 Example In which Copper Slag Was Added Further

170 parts of copper slag generated during smelting were further added to a cement-type composition in which 60 parts of pulp sludge ash was mixed with 120 parts of modified sodium silicate having an acidic group obtained by the method of Example 6 to prepare a composition. Table 3 shows the results measured according to the measurement method of Example 6.

<Example 10> Example consisting of additionally added waste foundry sand

To 60 parts of pulp sludge ash was added 100 parts of waste foundry sands selected to a size of 7 mm or less generated in the casting process to a cement-type composition mixed with 120 parts of modified sodium silicate having acid groups obtained by the method of Example 6. Prepare the composition. Table 3 shows the results measured according to the measurement method of Example 6.

Physical property test result of composition which added various aggregates further Sample Name Curing time (minutes) Weight before immersion (g) Weight after deposition (g) Strength before deposition (Kg / ㎠)  Strength after deposition (Kg / ㎠) Example 6 31 295.9 304.6 121 120 Example 7 28 364.6 375.1 126 130 Example 8 25 869.5 879.6 166 161 Example 9 30 469.1 473.8 181 180 Example 10 48 387.6 396.6 176 175

As can be seen in Table 3, the cemented composition according to the present invention is possible by mixing the modified sodium silicate having an acidic group in the pulp sludge ash, but it can be seen that the curing is somewhat delayed by the addition of the fly ash and the fly in the present invention. It was found that the hardening can be controlled by adding ash in combination, and it was found that rapid hardening and strength were expressed even when steelmaking dust and various aggregates were included. In particular, industrial wastes such as steelmaking dust containing a large amount of heavy metals can be quickly formed into the composition, it can be seen that various hazardous wastes can be used as a solidified cement. At this time, in addition to the wet method of injecting the cured mortar into the mold, the aggregate may be included to obtain a composition by a press molding method, wherein the lightweight aggregate is included in each of the compositions to reduce the composition. From 11 to 13.

<Example 11> Example which was configured by further adding wood flour

To the pulp sludge ash composition, in which 80 parts of pulp sludge ash was mixed with 100 parts of modified sodium silicate having an acidic group obtained by the method of Example 6, 60 parts of wood flour (sawdust) was added as a light weight aggregate, and the light weight aggregate was added. The composition is prepared by adding 1.5 parts of organic bentonite in a composition weight ratio so as to uniformly mix and distribute the mortar. After the prepared composition was injected into a cylindrical mold having a diameter of 50 mm and a depth of 100 mm, the initial curing time of the demoldable strength was measured, and the specific gravity and the weight before and after 12 hours of immersion in the tank after 3 days of natural curing were measured, and the results are shown in Table 4. It was.

Example 12 Example In which Pearlite was further added

To the pulp sludge ash composition, in which 80 parts of pulp sludge ash and 130 parts of modified sodium silicate having an acidic group obtained by the method of Example 6 were mixed, 40 parts of perlite and 1.5 parts of organic bentonite were added as a light weight aggregate. To prepare. Table 4 shows the results measured according to the measuring method of Example 11.

Example 13 Example in which Styrofoam particles were further added

To the pulp sludge ash composition, in which 80 parts of pulp sludge ash was mixed with 130 parts of modified sodium silicate having an acidic group obtained by the method of Example 6, 1,000 parts of styrofoam and methylcellulose having a size of 3 mm or less and 1.2 parts by weight were added as a light aggregate. To prepare a composition. Table 4 shows the results measured according to the measuring method of Example 11.

Physical property test result of composition additionally adding various lightweight aggregates Sample Name Initial Curing (min) importance Weight before deposition (g) Weight after deposition (g) Example 11 60 8.9 211.4 231.8 Example 12 55 7.3 173.1 180.6 Example 13 50 6.8 162.5 180.0

As can be seen from Table 4, even when the light weight aggregate is included in the composition, it can be seen that a light weight composition can be obtained by rapid curing. Here, in order to further reduce the weight, more lightweight aggregates can be included and press-molded. Using thickeners such as organobentonite and methyl cellulose, uniform mixing of the lightweight aggregates can be achieved.

<Example 14> Example comprised by adding the bubble further

Into the pulp sludge ash composition, 1.5 parts of methylcellulose was added to 80 parts of pulp sludge ash, and 100 parts of modified sodium silicate having an acid group obtained by the method of Example 6 was mixed, and 1000 cc of air bubbles obtained by compressing air with vegetable foaming agent were injected. And stirred to prepare the composition. After the prepared composition was injected into a cylindrical mold having a diameter of 50 mm and a depth of 100 mm, the initial curing time of the demoldable strength was measured, the specific gravity and the weight before and after 12 hours of immersion in the tank after 3 days of natural curing were measured, and the results are shown in Table 5. It was.

Physical property test result of composition including bubble Sample Name Initial Curing (min) importance Weight before deposition (g) Weight after deposition (g) Example 14 160 4.3 111.6 121.8

As can be seen in Table 5, it can be seen that even if bubbles are included in the cement composition of the present invention, the composition can be configured.

As shown in each of the above examples, by adding modified sodium silicate having an acidic group to the pulp sludge ash, a cement composition expressing rapid curing and excellent strength and water resistance can be obtained. In addition, the base composition may include incineration dust, aggregate, lightweight aggregate and air bubbles, and the composition thus obtained is economical that can be used in each industry as mortar for injection of building materials, civil engineering materials, interior materials, safes, etc. Phosphorus compositions can be provided. It is especially useful for solidifying hazardous industrial wastes quickly, and it is possible to improve the flexural strength by including wire mesh, waste fiber, fiber of fiber or pulp sludge in composition, and calcium carbonate, lime, magnesium oxide, oxidation It can be solved by adding metal oxides such as zinc, and modified silicate prepared by addition of boron, phosphoric acid and aluminum in the production of sodium silicate, silicate such as potassium silicate, lithium silicate, and sodium silicate. Solubility can be obtained the same effect, and depending on the use of the composition can be added dyes, pigments and separate Portland cement waterproofing agent, water repellent.

The cement composition comprising a mixture of pulp sludge ash and modified sodium silicate having an acid group is sufficient for use in industrial applications such as building materials because of its excellent water resistance and strength, and by adding various additives as necessary. It is possible to manufacture a composition that is suitable for the purpose, and can quickly prepare various kinds of wastes generated in the industry to contribute to the recycling of waste and environmental protection, and has the advantage of providing the composition quickly in a very economic way. .

Claims (12)

A pulp sludge ash and pulp sludge ash composition for producing building materials, characterized in that the mixture is prepared by mixing modified sodium silicate having an acid group, the mixing ratio of the pulp sludge ash and modified sodium silicate having an acid group is 1: 1.2 to 2. . It is prepared by mixing a modified sodium silicate having an acidic group in which pulp sludge ash and a polymer emulsion, wherein the mixing ratio of the modified sodium silicate having an acidic group is 1: 1.2 to 2. Pulp sludge ash composition for preparation. The method according to claim 1 or 2, The modified sodium silicate having the acidic group is mixed with sodium silicate, any one of sodium sulfate, copper sulfate, iron sulfate, aluminum sulfate, magnesium sulfate, bichromate, chromium alum, sulfuric acid, aqueous hydrochloric acid solution and mixtures thereof. Pulp sludge ash composition for building materials production. The method of claim 3, wherein A pulp sludge ash composition for building materials, characterized by further adding caustic soda as a catalyst. The method according to claim 1 or 2, The modified sodium silicate having the acidic group is manufactured by stirring the sodium sulfate, sodium sulfate, caustic soda, and chromium aqueous solution in sodium carbonate into an agitator and stirring. The method according to claim 1 or 2, The modified sodium silicate having the acidic group is a pulp sludge ash composition for building materials, characterized in that the sodium silicate, sodium lauryl sulfate 10% aqueous solution, caustic soda and sulfuric acid solution is put into a stirrer and stirred. The method of claim 2, The polymer emulsion is pulp sludge ash composition for building materials, characterized in that any one selected from latex, silicone resin, gum arabic, acrylic and epoxy. delete The method according to claim 1 or 2, In order to increase the strength, any one selected from dust, fly ash, sand, slag and foundry sand is added to the composition pulp sludge ash composition for manufacturing building materials. The method according to claim 1 or 2, In order to lower the specific gravity, the pulp sludge ash composition for building materials, characterized in that any one selected from the foam formed from wood powder, pearlite, vermiculite, styrofoam particles and foaming agent. The method of claim 10, In order to have a uniform distribution when adding the additives, pulp sludge ash composition for building materials, characterized in that the addition of organic bentonite or methyl cellulose. The method according to claim 1 or 2, In order to improve the flexural strength, to the composition, pulp sludge ash composition for building materials, characterized in that further addition of any one selected from wire mesh, waste fibers and fiber fibers.

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