JP3379924B2 - Adsorbent - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention uses a cement slurry having a specified water content, in particular, an inexpensive raw material such as a waste cement slurry, to adjust the water content, and further to improve the adsorbability and ion exchange capacity. Regarding adsorbents with a porous structure obtained by adding a grant agent and two-stage curing, more specifically, purification of wastewater, river water, atmosphere, etc. as an environmental material that takes advantage of the excellent adsorption function due to the porous structure. Purifying material that enhances function,
Under-floor humidity control materials, humidity control deodorant wall materials, heat insulation / sound absorption boards, panels, building materials that make up a comfortable living space, greening, medium materials, soil improvement materials, civil engineering / agricultural materials that improve the environment for plant growth, etc. The present invention relates to an adsorbent that is preferably used in.

[0002]

2. Description of the Related Art The development of industry is useful for improving people's lives, but it also causes pollution that threatens people's lives. Knowing that this pollution causes inhumane damage to people, humankind is beginning to move toward a new goal of improving lives without pollution.

Water pollution in rivers, lakes and oceans is considered to be typical pollution along with air pollution. To prevent this water pollution, a certain amount of wastewater is discharged into rivers, lakes and oceans. Although the water quality of wastewater is regulated for companies, etc., the water quality of general household wastewater, which has a relatively small amount of wastewater, is not regulated.

This water quality regulation has achieved some results,
The water quality of lakes and oceans has improved compared to the past. In particular, it can be evaluated that strict water quality regulations for the discharge of heavy metals and poisonous substances that cause deterioration and loss of physical function have considerably improved the safety of water quality in rivers and the like. However, it is said that water pollution caused by wastewater from unregulated wastewater sources has not diminished, but rather intensified, and today it is necessary to improve the water quality of rivers, lakes and marshes or the ocean itself. Has been.

In the water quality problem of rivers, lakes and oceans, "Aoko" that causes damage to the fishing industry has been given the most importance.
It is a problem of eutrophication that causes "red tide". That is,
The problem is that the contents of organic substances, nitrogen compounds, phosphoric acid and phosphates in water become too large.

[0006] Organic sewage such as domestic urine sewage, household wastewater, and sewage is widely known to eutrophicate the water quality, and in order to prevent eutrophication of the water quality, these organic sewage treatment methods are used. Have been proposed.

For example, sewage is subjected to a pretreatment such as a screen, sedimentation and sedimentation to separate solids (sludge) from a liquid, and then subjected to a high-grade treatment such as a sprinkling filtration method and an activated sludge method to be oxidized, After that, it is treated by sequentially performing biological treatment, final precipitation (or precipitation), and disinfection.

The screen is a process in which sewage is flowed through a parallel rod-shaped, lattice-shaped, or mesh-shaped sieve to simply mechanically remove coarse suspended matter in the sewage. Sedimentation reduces the flow rate of sewage and causes heavy solids to flow. It is a process of precipitating gravel. In the sedimentation treatment, in order to separate the organic matter to be subjected to a post-treatment different from the post-treatment of the gravel from the gravel, the flow rate is adjusted so that the organic matter is prevented from precipitating as much as possible.

Precipitation is classified into ordinary precipitation and chemical precipitation, and ordinary precipitation mainly precipitates organic suspended matter. This sediment is called sediment sludge or raw sludge. Chemical precipitation is a method in which a chemical is added to promote sludge precipitation to cause coagulation precipitation. The chemicals used include a sulfuric acid band, aluminum chloride, trivalent or divalent iron sulfate, iron trichloride, and dichloride. Typical examples are iron chloride, slaked lime, and organic flocculants.

Since chemical precipitation can remove 80 to 95% of suspended solids, it was considered that the sewage treatment was solved by this. However, spoilage of sewage effluent, large amount of sedimented sludge, and expensive chemicals. With the big problem of
At present, it can be said that the biological treatment in the high-grade treatment has been replaced.

The sprinkling filtration method is typical of its biological treatment, in which sewage is made into a fountain and sprinkled on a coarse filter medium, and the sewage is allowed to adhere to the surface of the filter medium while flowing downward through the gaps in the coarse filter medium. It is a treatment method in which the aerobic cell membrane is touched and oxidized, and there are a fixed type in which the sprinkling position is fixed and a rotating type in which the sprinkling position is swung by using the reaction of the sprinkling. This sprinkling filtration method has the advantages that it is easy to maintain and requires less manpower, that the sewage sewage is oxidized well and that it is not septic.

In the activated sludge method, when oxygen is thoroughly agitated into sewage, the sludge becomes spongy and has a large volume.
This is a treatment based on the fact that if it is left to stand, it will easily settle. If 25% of the sludge thus produced is returned and mixed with fresh sewage for work, it will be extremely clear in a short period of time. A good supernatant can be obtained.

By the way, in recent years, a porous calcium silicate-based carrier has been proposed as a microbial carrier used for denitrification and dephosphorization (see Japanese Patent Publication No. 6-83832).

This microbial carrier is obtained by subjecting a foamed and cured product obtained by foaming an aqueous slurry composed of a siliceous raw material and a calcareous raw material in the presence of a foaming agent to a hydrothermal reaction, and 50
Mainly composed of porous calcium silicate having a porosity of 90%. , And as a siliceous raw material, "silica,
"Powder such as silica sand, cristobalite, amorphous silica, diatomaceous earth, ferrosilicon, and white clay" is used, and as calcareous material, "powder of quick lime, slaked lime, cement, etc." is used. As the foaming agent, "a metal foaming agent such as aluminum powder or a foaming agent such as an AE agent" is used. Specific examples of the foaming agent include "resin soaps, saponins, synthetic surfactants". , Hydrolyzed proteins, polymeric surfactants, etc. ”.

As the porous calcium silicate hydrate as a product, CHS gel, tobermorite and zonolite are mentioned.

In the water treatment using this microbial carrier, an aerobic filter bed filled with this filter medium is subjected to a primary treatment to remove suspended solids and precipitates, and the organic wastewater is aerated while being aerated. Thereby, the removal of organic substances by the biofilm method, the removal of phosphorus, and the nitrification of nitrogen compounds are simultaneously performed. Then, in order to treat the treated water containing the nitrified nitrogen compound, the treated water is introduced from the aerobic filter bed tank into the anaerobic filter bed tank, and a hydrogen donor such as methanol is added to the aerated anaerobic tank. In the state biological denitrification is performed by denitrifying bacteria.

The size of the microorganism carrier is 0.5.
It is said that 10 mm is desirable.

On the other hand, improvement of water quality by using a porous material such as charcoal or zeolite as a filter medium has been performed for a long time. For example, a technique for removing the odor of tap water by attaching a water purifier filled with activated carbon to a faucet of domestic water supply and passing the water flowing out from the faucet through the water purifier has already been put to practical use.

[0019]

By the way, in this conventional microorganism carrier, since the water slurry comprising the siliceous raw material and the calcareous raw material is foamed in the presence of the foaming agent, the pore size is small. There is a problem that it becomes difficult to make a uniform product due to unevenness and variations in the ability to adsorb microorganisms, the ability to treat sewage, and the durability.

In addition, since waste materials are not used as raw materials, but all are purchased as raw materials, the material cost is high, and equipment and labor for forming the water slurry are required. However, considering the equipment cost and labor cost, it will be expensive.

[0021] Further, it is desirable to have 0.5 to 10
If the particle size is mm, it may be washed away by the water flow when used as a purification agent for river water.

In addition, in order to carry out nitrification of organic substances, phosphorus and ammonia nitrogen by a biofilm, it is necessary that a certain amount of microorganisms live on the microorganism carrier, and this microorganism is implanted on the microorganism carrier. It has a major drawback that it can hardly be expected to have a purification function while it is propagated above a certain level.

On the other hand, since charcoal and zeolite adsorb organic substances, phosphate ions and ammonia nitrogen in the treated water by their chemical and physical adsorption capacities, they exhibit a purifying function at the start of use, but they are durable. Since it has low properties and strength, it has the problem of being washed away or damaged when used as a purification agent for river water.

In order to solve this strength problem, it is conceivable to mix zeolite, for example, into concrete. However, since concrete itself is a highly watertight material, the action of zeolite exposed on the surface can be expected. ,
There is a problem that it cannot be expected that the zeolite buried inside will act.

By the way, in view of these technical problems in the conventional technique for improving the water quality by using a porous body, in a cement product manufacturing factory using cement such as concrete pile as a raw material, the cement is inevitably inevitable. There is a problem in that a waste cement slurry containing is generated, and an expensive treatment cost must be spent to treat the waste cement slurry.

For example, in the manufacturing process of concrete piles, cement milk is put into a cylindrical mold, the mold is rotated around its axis and centrifugally molded, and then the weight of the product is measured before steam curing. In order to reduce the amount, it is necessary to discharge the slurry cement waste material at the center out of the form.

Also in the process of manufacturing the fume pipe, cement milk is put into a cylindrical mold, the mold is rotated around its axis and centrifugally molded, and then the inner diameter is measured before steam curing. In order to maintain the dimensional accuracy of, it is necessary to discharge the slurry-like cement waste material at the center out of the form.

Slurry-like cement waste generated in these concrete pile and fume pipe manufacturing plants,
That is, the waste cement slurry hardens if left unattended,
The cured product has low strength, and it is feared that it will disintegrate with the passage of time and that it will elute the alkaline component, which will affect the environment.

Further, the hardened product of this waste cement slurry cannot be increased in strength even by steam curing, and cannot be reused as a structural material.

Then, it was once considered to solidify the waste cement slurry into a block of a certain size and use it as a landfill material, but it is interpreted that it is difficult to put it into practical use because of these problems. After all, waste cement slurries have so far been treated as industrial waste at great expense.

Therefore, in order to solve the problem that a large amount of treatment cost is required, while making effective use of the waste cement slurry for some purpose, the components of the waste cement slurry are cement and water. It was found that Portland cement and silica fine powder are the main components, except that the weight ratio is approximately 1: 1 and that the mineral composition and pore distribution change over time with the formation of hydrates and crystal growth. did.

Therefore, in the present invention, in the cement slurry, in order to use the waste cement slurry as an effective resource, the weight ratio of water to cement of the ordinary cement hardened body (referred to as water cement weight ratio) is 50. While the adsorbent was manufactured by increasing the ratio and the water adsorbent was subjected to a water purification test using various adsorbents, the water-cement weight ratio was particularly high at 70 to 150%. That cement slurry is formed, and the cement slurry is filled in a mold and subjected to normal temperature high temperature curing (steam curing) to obtain a porous body of calcium hydroxide and calcium carbonate composition having relatively uniform pore diameters, It was found that, after the normal temperature and high temperature curing, the porous body was subjected to high temperature and high pressure curing (autoclave curing) to obtain a porous cured body which did not change with time.

Further, this porous hardened body has a porous body structure having continuous fine pores by calcium silicate hydrate called CSH gel or tobermorite gel in which calcium hydroxide and siliceous are bonded, Moreover, it was found that, in addition to the calcium silicate hydrate, it also contains a hydrated product containing calcium and alumina as main components.

Further, when the porous body cured by normal temperature and high temperature curing is cured at high temperature and high pressure, a hydrothermal reaction occurs, and alkali elution is suppressed by the hydrothermal reaction and the strength of the cured product is increased. , The hydration product of the alumina component formed by this hydrothermal reaction has a function similar to that of zeolite, and it has excellent adsorption ability for phosphoric acid, phosphate, nitrogen compounds and other environmental pollutants that enrich water quality. Was found to have.

In addition, the porous cured product has a pore volume of 0.2 to 0.75 mL / g and a specific surface area of 15 to 55 m ² /
The number of pores is extremely large, and the maximum radius of the pores is 0.05 to 0.45 micron, and there are wide pores having different submicrons or different diameters or diameters. Of course, the diameter of 20 ~ is said to be involved in adsorption
It also contains many 500 angstrom pores (called mesopores).

In the cement slurry, CaO /
When there is a silica component having a SiO ₂ molar ratio of 2.0 or less, CaO forms calcium silicate hydrates such as tobermorite and xonotlite from the silica component and water, and a zeolite-like substance, that is, alumina. It was also found that the formation of hydrated products with bound minutes did not proceed.

From the above, the inventor of the invention of Japanese Patent Publication No. 6-83832 discloses that in the porous calcium silicate-based microorganism carrier according to the present invention, CaO / SiO ₂
Molar ratio = 0.5 to 2.0, specifically 0.8, 1.0,
Since the siliceous raw material and the calcareous raw material are mixed so as to be 1.5, the silica content is CaO / SiO ₂ molar ratio =
When it exceeds 2.0, it is interpreted that it was not possible to know that a zeolite-like substance was formed, and it was not even known that this zeolite-like substance could be formed. It is conceivable that the idea that mineral substances exert the function of purifying water by adsorbing environmental pollutants could not be reached.

In the invention according to Japanese Examined Patent Publication No. 6-83832, a foaming agent is used to focus on biological treatment and form pores suitable for implantation and reproduction of microorganisms. It is speculated that the technical means of making it porous was adopted.

According to the present invention, as described above, a cement slurry having a water-to-cement weight ratio of 70 to 150% and a powdery or granular mineral material containing silica and alumina as main components is always used. It was completed based on the finding that a porous hardened material containing a zeolite analogue can be obtained by high-pressure and high-temperature curing followed by high-pressure and high-temperature curing. Component and alumina component as powdery or granular mineral materials as the main component to form a cement slurry containing a zeolite analogue to form a hardened porous cement, which is porous with little change over time, such as ammoniacal nitrogen. In addition to exhibiting an excellent adsorption function for the nitrogen compounds of the above, it also has an extremely excellent ion exchange capacity for adsorption of microorganisms and various ions such as phosphate ions. Demonstrate air purification function, humidity control / deodorization function, heat insulation / sound absorption function, soil improvement / reformation function, etc., long-term stability of these various functions, further excellent durability, and extremely low price. It is intended to provide an adsorbent.

[0040]

In order to achieve this object, the adsorbent according to the present invention is a powder containing 70 to 150 parts by weight of water, 100 parts by weight of cement and silica and alumina as main components. A cement slurry consisting of 5 to 50 parts by weight of a granular or granular mineral material is formed, and this is subjected to normal temperature and high temperature curing and high pressure and high temperature curing in order to harden and form a porous structure .
In addition, it contains the above-mentioned silica and alumina as main components.
Zeolites by hydrothermal reaction of powdery or granular mineral materials
It is characterized in that an analog is generated .

70 parts by weight of water to 100 parts by weight of cement
150 parts by weight and 5 to 50 parts by weight of a powdery or granular mineral material containing silica and alumina as main components are mixed and kneaded to form a cement slurry, which is then put into a formwork and then at normal pressure. When subjected to high temperature curing, a porous body of calcium hydroxide and calcium carbonate composition having relatively uniform pore diameters due to evaporation of water is obtained, and subsequently, when the porous body is subjected to high pressure and high temperature curing, a zeolite analogue is obtained. It is possible to obtain a porous cured body (adsorbent) containing

The obtained adsorbent is porous with little change with time and exhibits a remarkably excellent adsorption function for nitrogen compounds such as ammoniacal nitrogen, and also adsorbs microorganisms and phosphate ions. Excellent ion exchange capacity for various kinds of ions, purification function for atmosphere, humidity control and deodorant function,
A heat-insulating / sound-absorbing function, soil-improving / modifying function, etc., long-term stability of these various functions, and extremely excellent durability, and a significantly inexpensive porous hardened material (adsorbent) can be obtained. Of.

That is, the porous hardened material, that is, the adsorbent according to the present invention contains a hydration product similar to zeolite, and enriches water quality such as organic matter, phosphoric acid, phosphate and nitrogen compounds. Demonstrates excellent adsorption / holding ability for water pollutants that become solidified, air pollutants such as malodorous components in the air, moisture in the air, metal ions such as phosphate ions and potassium ions in soil, ammonium ions, and water. Therefore, it is extremely useful as an adsorbent used for purification and improvement of rivers, lakes, oceans, the atmosphere, and soil.

The adsorbent of the present invention will be described in more detail below. The cement used in the present invention is not particularly limited, and a commercially available cement is preferable from the viewpoint of manufacturing cost, availability, and the like.

As this cement, Portland cement,
Mixed cement and special cement are included, and Portland cement includes ordinary Portland cement, early strength Portland cement, super early strength Portland cement, moderate heat Portland cement, low heat Portland cement, sulfate resistant boltland cement and these cements. Includes low-alkali types in which the total alkali content is kept below 0.6%.

The mixed cement is obtained by binding a suitable blast furnace slag or bozolan material to a clinker of Portland cement and crushing it, and includes blast furnace cement, silica cement and fly ash cement.

As a representative of the special cement, an almost equal amount of limestone is mixed with bauxite, which is melt-calcined and then rapidly crushed and crushed. It is possible to cite ultra-fast hardening cement which shows an improvement and is expected to have high strength.

Of these cements, the cheapest,
It is recommended to use ordinary Portland cement which is easily available.

The powdery or granular mineral material containing silica and alumina as the main components used in the present invention is not particularly limited as long as it can form a zeolite analogue in the two-stage curing step. However, fly ash, which produces the cheapest and most adsorptive zeolite analog, is desirable.

In order to obtain the adsorbent according to the present invention, first, to 100 parts by weight of cement, 70 to 150 parts by weight of water and a powdery or granular mineral material 5 containing silica and alumina as main components 5 ˜50 parts by weight are blended and kneaded to form a cement slurry.

If the amount of water is less than 70 parts by weight with respect to 100 parts by weight of cement, there is a limit to the porosity due to evaporation of water, and it is difficult to obtain an adsorbent exhibiting the required adsorption capacity. If it exceeds the weight part, separation of materials will occur, curing will be difficult even after two-stage curing, the strength of the cured product will decrease, and it will weather or collapse during use, resulting in required durability. It is preferable that the amount of water is 75 to 125 parts by weight with respect to 100 parts by weight of cement.

If the amount of the powdery or granular mineral material containing silica and alumina as main components is less than 5 parts by weight with respect to 100 parts by weight of cement, the formation of the zeolite analogue is insufficient and the desired adsorption is achieved. On the other hand, it is not possible to expect various functions such as functions to be exhibited. On the other hand, if the amount exceeds 50 parts by weight, the effects of various functions such as adsorption will be limited, and there is no point in blending any more, and it will not only be a hardened material (adsorbent ) Is not preferable because the strength of the cement may decrease.
It is desirable to use 10 to 30 parts by weight of powdery or granular mineral material containing silica and alumina as main components with respect to 00 parts by weight.

When the obtained cement slurry was put into a mold and then subjected to normal temperature and high temperature curing, a porous material having a calcium hydroxide and calcium carbonate composition with relatively uniform pore diameters due to evaporation of water was obtained. A body is obtained and then this porous body is aged under high pressure and high temperature to obtain a porous hardened body (adsorbent) containing a zeolite analogue.

Here, the normal temperature high temperature curing for hardening the cement slurry put in the mold is performed by the same procedure as the known steam curing, and the cement is heated from room temperature to a predetermined curing temperature by taking an appropriate time. After raising the temperature of the slurry, the curing temperature is maintained for a predetermined time, and then the slurry is allowed to cool in the air. The curing temperature is not particularly limited, and the curing time for maintaining this curing temperature is not particularly limited. For example, the curing temperature may be 60 to 75 ° C., and the curing time maintained at this curing temperature is 5 It should be about time.

Further, the cement slurry is hardened by normal temperature and high temperature curing to obtain a porous body of calcium hydroxide and calcium carbonate composition having relatively uniform pore diameters, and then the high pressure and high temperature curing of the porous body. A porous cured body (adsorbent) with little change over time can be obtained.

This high-pressure and high-temperature curing is performed using an autoclave, for example, for about 4 hours at a temperature of 160 to 180 ° C. and a pressure of 8 to 10 kg / cm ² .
For cooling after high-pressure and high-temperature curing, for example, a method of cooling to about 120 ° C. for about 3 hours, water cooling to about room temperature for about 4 hours, and then cooling to room temperature by natural cooling is adopted. To be done.

Cured product (adsorbent) thus obtained
Contains a CSH gel in which calcium hydroxide and siliceous are bonded to each other without any change over time, and also contains a hydrated product containing calcium and alumina as main components.

Further, the hydrothermal reaction that proceeds during the high-pressure and high-temperature curing suppresses the elution of alkali from the hardened body (adsorbent) and enhances the strength of the hardened body (adsorbent). Moreover, the hydrated product, which is formed by the hydrothermal reaction and is bonded with the alumina component, has a function similar to that of zeolite, that is, it has a physical adsorption ability, and phosphoric acid,
It exhibits excellent adsorption ability for environmental pollutants such as phosphate and nitrogen compounds that enrich water quality. In this case, microorganisms are adsorbed on the cured body (adsorbent), and an excellent denitrification effect is obtained by the adsorption of microorganisms.

In the present invention, the method for forming the cement slurry is not particularly limited, but the material cost is reduced, and the waste cement slurry generated during the production of cement products is effectively used. It is desirable to improve the environment by using it as an effective resource.

That is, in the adsorbent of the present invention, water or cement or a powdery or granular mineral material containing silica and alumina as main components is added to the waste cement slurry generated during the production of cement products. Unit volume weight 1.
It was adjusted to 3~1.7t / m ^3, curing which are sequentially subjected to the atmospheric pressure high temperature curing and high pressure, high temperature curing, whereupon co the porous structure
In addition, the above-mentioned silica and alumina components
Zeolite analogue by hydrothermal reaction of stone granular mineral material
Which was formed by generating the desirable.

By the way, water or cement or a powdery or granular mineral material containing silica and alumina as main components is added to the waste cement slurry generated during the production of cement products, and the unit volume weight is 1.3 to 1. The reason why the adsorbent is adjusted to 7 t / m ³ is that the adsorbent having the same composition ratio as that of the adsorbent according to the present invention can be obtained by adjusting within this range.

That is, the present inventor has not used the waste cement slurry, and the treatment thereof requires a large amount of money and causes a deterioration of the environment. Therefore, in order to solve these problems, the waste cement slurry is used. While studying the effective use for some purpose, the components of the waste cement slurry are mainly composed of Portland cement and silica fine powder except that the ratio of cement and water is approximately 1: 1 by weight. Then, it was found that the mineral composition and the pore distribution change with time due to the formation of hydrate and the crystal growth.

Therefore, in the present invention, in the cement slurry, in order to use the waste cement slurry as an effective resource, the weight ratio of water to the cement of the ordinary cement hardened body (water cement weight ratio) is 50. While the adsorbent was manufactured by increasing the ratio and the water adsorbent was subjected to a water purification test using various adsorbents, the water-cement weight ratio was particularly high at 70 to 150%. That cement slurry is formed, and the cement slurry is filled in a mold and subjected to normal temperature high temperature curing (steam curing) to obtain a porous body of calcium hydroxide and calcium carbonate composition having relatively uniform pore diameters, It was found that when this porous body is subjected to high-temperature and high-pressure curing (autoclave curing) following this normal-pressure high-temperature curing, a porous cured body with little change over time can be obtained. .

Further, this porous hardened body has a porous body structure having continuous fine pores by calcium silicate hydrate called CSH gel or tobermorite gel in which calcium hydroxide and siliceous are bonded, Moreover, it was found that, in addition to the calcium silicate hydrate, it also contains a hydrated product containing calcium and alumina as main components.

Further, when the porous body cured by normal temperature and high temperature curing is cured at high temperature and high pressure, a hydrothermal reaction occurs, and alkali elution is suppressed by this hydrothermal reaction and the strength of the cured product is increased. , The hydration product of the alumina component formed by this hydrothermal reaction has a function similar to that of zeolite, and it has excellent adsorption ability for phosphoric acid, phosphate, nitrogen compounds and other environmental pollutants that enrich water quality. Was found to have.

The porous hardened material (adsorbent) has a pore volume of 0.2 to 0.75 mL / g and a specific surface area of 15 to
The number of pores is very large at 55 m ² / g, and the maximum pore radius of these pores is 0.05 to 0.45 micron, and there are a wide range of submicron or smaller pore radii or diameters. There is. Of course, many pores (called mesopores) having a diameter of 20 to 500 Å which are said to be involved in adsorption are also included.

As the waste cement slurry generated at the time of manufacturing this cement product, a cement product manufacturing factory using cement such as concrete pile as a raw material,
Inevitably, a waste cement slurry containing cement may be generated, and this waste cement slurry is included.

Specifically, for example, in a concrete pile manufacturing process, cement milk is put into a cylindrical mold, the mold is rotated around its axis, and centrifugal molding is performed, but before steam curing is performed. In order to reduce the weight of the product, there is a waste cement slurry in which a slurry-like cement waste material at the center is discharged out of the mold.

Also in the process of manufacturing the fume pipe, cement milk is put into a cylindrical mold, the mold is rotated around its axis and centrifugally molded, and then the inner diameter is measured before steam curing. In order to maintain the dimensional accuracy of, the waste cement slurry in which the slurry-like cement waste material at the center is discharged to the outside of the mold is mentioned.

Further, in the present invention, after the above-mentioned cement slurry is formed, this cement slurry is put into a mold, but the shape of the mold chamber of this mold is not particularly limited, and for example, a spherical shape, a cubic shape, A rectangular shape including a plate shape, a cylindrical shape, a fan shape, an L shape, an H shape, a conical shape, a triangular pyramid shape, a quadrangular pyramid shape, and the like, and an arbitrary shape such as a tetrapot shape can be selected. Further, a hollow core, such as a cylindrical shape, a rectangular tube shape, or a cubic bone frame shape, may be formed by placing an appropriate core in the mold chamber.

Further, in the present invention, the adsorbent obtained by mixing 5 to 50 parts by weight of the functional aggregate having an adsorbing function with 100 parts by weight of cement in the cement slurry has an adsorbing function. It is advantageous in further improving the treatment capacity of the adsorbent of the present invention.

Examples of the functional aggregate include at least one selected from zeolite, zeolitic tuff, porous mineral materials such as porous iron oxide and pearlite, activated carbon and chaff and charcoal.

The functional aggregate used in the present invention is phosphoric acid,
It is not particularly limited as long as it is a granule having an adsorption function for environmental pollutants such as phosphate and nitrogen compounds that enrich water quality, but in consideration of price and availability, zeolite having physical adsorption ability It is recommended to use activated carbon materials such as zeolitic analogues such as and zeolitic tuff and chaff charcoal with chemical adsorption capacity.

Further, the preferable amount of the functional aggregate to be blended differs depending on the functional aggregate to be used. For example, in the case of zeolitic tuff, the weight ratio to cement is 10 to 40%.
Is preferable, and in the case of chaff and charcoal, the weight ratio to cement is preferably 5 to 15%.

By the way, when the present invention is formed into a gravel shape or is formed into a cobblestone shape and placed on a riverbed or a riverbank, the present invention is prevented from being swept away by a stream of water before being put into a mold. It is preferable that the aggregate is mixed with the cement slurry so that the specific gravity after curing becomes 2.5 to 3.5, and the mixture is kneaded.

That is, the adsorbent according to the present invention is preferably one in which an aggregate such as iron ore is mixed with the cement slurry so that the specific gravity thereof is 2.5 to 3.5.

As a matter of course, the aggregate for the purpose of adjusting the specific gravity is required to have a specific gravity of greater than 2.75, and particularly a specific gravity of greater than 3, for example, coarse bone made of iron ore. It is only necessary to use a fine aggregate or a fine aggregate, or to use a coarse aggregate and a fine aggregate composed of these iron ores in combination.

The mixture of aggregate into the cement slurry is
It is also useful to prevent cracking during solidification, such as during normal pressure high temperature curing and high pressure high temperature curing. The type of aggregate for the purpose of preventing cracks is not particularly limited, and, for example, aggregates made of silica stone, tuff, etc., which are added to ordinary mortar or concrete as aggregates, may be used.

Among these, it is more preferable to use an aggregate made of tuff which has no adsorptive cracks and has an adsorptive capacity. However, sinking cracks on the casting surface that occur when silica aggregate is mixed can be eliminated by vibration compaction after placing the aggregate and the slurry in the mold, and hardening other than silica. Even when a subsidence crack occurs on the cast surface at the same time, it is possible to prevent the subsidence crack from occurring by similarly performing vibration compaction.

The method of mixing the aggregate into the cement slurry is not particularly limited, and for example, a method of mixing the aggregate into the cement slurry in advance, kneading the mixture, and then pouring it into the mold can be adopted. After filling the inside with aggregate such as silica stone or tuff, the method of pouring the slurry into the form, the method of putting the aggregate into the form into which the cement slurry is poured, etc. are adopted. You can also do it.

However, when the cement slurry is charged into the mold after filling the mold with the aggregate made of tuff, the aggregate may float up. To solve this problem, tuff is used as the aggregate. When used, it is desirable to employ a method in which the aggregate and the slurry are mixed, kneaded (after premixing), and then the mixture is put into a mold.

The adsorbent according to the present invention can be fiber reinforced in order to increase bending strength and compressive strength. However, in this case, it is preferable that the lower surface side of the mold chamber and the placing surface side are fiber-reinforced in the same manner. For example, when the surface of the adsorbent is fiber-reinforced, it is preferable to fiber-reinforce both the lower surface of the mold chamber and the driving surface (or the upper surface of the molding chamber), and only the driving surface (or the upper surface of the molding chamber) or the mold. It is not preferable to fiber-reinforce only the lower surface of the chamber, because cracks may occur during normal temperature high temperature curing.

The material of the fibers used for fiber reinforcement is not particularly limited, but it is preferable to use inorganic fibers such as carbon fibers and steel chips. Further, the length of the fiber used for fiber reinforcement is not particularly limited, and may be a long fiber or a short fiber. Furthermore, these fibers can be knitted into a cloth,
It may be woven or used, or may be used by binding it with a binder in a non-woven fabric form or a matte form, may be used by bundling it, knitting it in a rope form, or may be used separately. Among the usage forms of these reinforcing fibers, the form used by bonding to a nonwoven fabric or mat in a binder is inexpensive in price, easy to handle, and from the viewpoint that the reinforcing fibers can be evenly arranged, desirable.

However, in the case of using a binder in which fibers are bonded to each other in a non-woven fabric or mat form, the binder may be melted out during high-pressure high-temperature curing and may be deposited on the surface during cooling. However, the fibers themselves may melt and precipitate on the surface during cooling. Especially when using a glass fiber non-woven fabric or glass fiber mat with a relatively low fiber melting point, it is necessary to set a low curing temperature and a long curing period in order to prevent the binder from dissolving. Problems arise.

In the carbon fiber mat, the melting temperature of the binder is higher than the curing temperature of the cement slurry at the time of high-pressure and high-temperature curing, so that the problem of the dissolution and precipitation of the binder does not occur, but the cement slurry hardly penetrates and the cured product Fibers may be exposed on the surface of. However, this problem does not occur if curing is performed after pouring the slurry into the mold and then vibrating and compacting it so that the cement slurry is sufficiently permeated between the fibers.

[0086]

As described above, the adsorbent according to the present invention is a powdery or granular mineral material containing 70 to 150 parts by weight of water and 100 parts by weight of cement and silica and alumina as main components. A cement slurry consisting of 5 to 50 parts by weight is formed, and this is subjected to normal-pressure high-temperature curing and high-pressure high-temperature curing one after another to harden to form a porous structure, and the above-mentioned silica.
Or granular mineral material consisting mainly of minerals and alumina
Since a zeolite analog is formed by the hydrothermal reaction of , a hydration product having a function similar to that of a zeolite, that is, a hydration product in which an alumina component is bonded, is included, and a porous product that does not change with time is included. It is a hardened product, and by doing so, it exhibits an action of exerting an excellent adsorption ability for environmental pollutants such as organic substances, phosphoric acid, phosphates, and nitrogen compounds that enrich water quality.

In the present invention, the cement slurry is prepared by adding water or cement or a powdery or granular mineral material containing silica and alumina as main components to the waste cement slurry produced in the process for producing cement products. Forming by adjusting the unit volume weight to 1.3 to 1.7 t / m ³ eliminates the need for dedicated equipment for producing cement slurry, and also significantly reduces the labor for producing cement slurry. It is possible to obtain the effect that it can.

Further, in the present invention, a mixture of 5 to 50 parts by weight of a functional aggregate having an adsorbing function with respect to 100 parts by weight of cement in the cement slurry is used for the environmental pollutants of the obtained adsorbent. It is possible to obtain the effect that the adsorption function is further improved and the treatment capacity of the adsorbent of the present invention is significantly enhanced.

Here, if a cheap and easily available material such as a natural mineral material containing silica and alumina as main components and rice husk husk charcoal is used as the functional aggregate, the cost of the raw material can be further reduced. Is obtained.

In addition, in the present invention, when the cement slurry is mixed with an aggregate made of, for example, iron ore so that the specific gravity after hardening becomes 2.5 to 3.5, the specific gravity of the present invention becomes It becomes the same as the specific gravity of the cobblestone placed on the riverbed or the riverbank for protection of the riverbank and the riverbank, it can be prevented from being swept away by the water force of the flowing water, and it can be laid on the riverbed or riverbank by a simple work of just putting it in water Is obtained.

Although the present invention was originally invented as an adsorbent used for water purification and air purification, since it has an adsorbing ability, it is adsorbed with a fertilizer, a soil conditioner or the like in advance, or after being used as a fertilizer. Without adsorbing the soil and soil-improving materials, it can be planted on the surface of the earth or embedded in the soil for greening,
Therefore, it can be used as an agricultural material, a horticultural material or a civil engineering material for improving the environment for growing plants such as medium and soil improvement.

Further, since the present invention has an adsorbing ability, it can be used as a building material such as an underfloor humidity control agent and a humidity control deodorant wall material, and since the present invention is porous, it is a heat insulating material and a soundproofing material. It can be used as a building material such as, and by using these building materials, the comfort of living space can be enhanced.

[0093]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be specifically described below with reference to the drawings, but the present invention is not limited to these embodiments.

Example 1 An adsorbent material according to an example of the present invention was formed by using a cement slurry made of waste cement slurry discharged from a formwork and stored in a container after centrifugal formation of concrete piles. is there.

In this concrete pile, 100 parts by weight of ordinary Portland cement, 50 parts by weight of water, and 50 parts by weight of coarse aggregate made of silica were mixed and kneaded, and the kneaded concrete milk was mixed in the mold chamber of the mold. It is centrifugally molded by pouring and rotating the mold together with the center axis of the mold chamber. To reduce the weight, the waste cement slurry collected at the center is taken out during the centrifugal formation.

When adjusting the cement and fly ash with water so that the unit volume weight of the waste cement slurry stored in the container is about 1.5 t / m ³ , 10 parts by weight of fly ash is added to 100 parts by weight of cement. Parts were prepared.

Then, after confirming that the unit volume weight of the waste cement slurry is about 1.5 t / m ³ ,
50mm in diameter and 30mm in depth
This waste cement slurry is poured into a mold having a cylindrical mold chamber, and left for 1 hour, and then aged under normal pressure and high temperature.

Then, as shown in the temperature control characteristic diagram of FIG. 2, the waste cement slurry is heated to about 27 ° C. by the heat generated by the hydration reaction started after the raw materials are mixed,
In this normal pressure high temperature curing, the slurry is heated from this temperature (about 27 ° C.) to 70 ° C. for about 3 hours, and then the temperature of 60 to
The measurement was carried out by maintaining the temperature in the range of 75 ° C and the average temperature of 70 ° C for about 4 hours.

By this normal pressure and high temperature curing, the waste cement slurry is hardened to obtain a porous hardened body of calcium hydroxide and calcium carbonate composition (hereinafter referred to as a porous body).

Then, the porous body was mixed with the concrete.
Put in an autoclave at the same time as the pile, and cure at high pressure and high temperature
It The temperature of the porous material before it is put into the autoclave
Falls to 35 to 43 ° C, but the temperature control characteristic line of Fig. 3
As shown in the figure, in high pressure high temperature curing, this porous
Raise your body from this temperature to 165-180 ° C over 3 hours
In addition to raising the temperature, the furnace pressure should be
9-10 kg / cm ²After raising the pressure to 1,
65 ~ 180 ℃, average 175 ℃, furnace pressure 9 ~ 10K
g / cm², 9.8 kg / cm on average²Hold it for 4 hours
In addition, it takes two and a half hours to reduce the road pressure to normal pressure.
In addition, the temperature inside the furnace is about 120 ° C over 3 hours by forced air cooling.
Temperature and then water cooling for 4 hours
After cooling down to 20 ° C, natural heat dissipation allows the porous body and
And gradually cool the furnace temperature to room temperature. And this porous body
After it is cooled down to room temperature, it is released into a predetermined shape.
The formed adsorbent can be obtained. More
Also, the adsorbent formed in this way is crushed into a filter medium.
It is also possible to use. Thus, the adsorption of the present invention
I got the material.

By the way, the hydrothermal reaction that proceeds during the high-pressure and high-temperature curing suppresses the elution of alkali from the adsorbent and enhances the strength of the adsorbent. In addition, this hydrothermal reaction produces a CSH gel in which calcium hydroxide and siliceous are bonded in the adsorbent, and a hydrated product in which alumina is bonded.

Since this hydration product has innumerable fine pores, it has a function similar to that of zeolite, that is, it has a physical adsorption ability, and as will be described later, organic matter, phosphoric acid, phosphate and nitrogen compounds. It exhibits excellent adsorption capacity for environmental pollutants that enrich water quality.

Example 2 Waste cement slurry, that is, in a concrete pile manufacturing process, a mold into which the waste cement slurry discharged from the mold was put was previously prepared with respect to 100 parts by weight of cement in the waste cement slurry. , 40 parts by weight of an aggregate made of zeolitic tuff was filled as a functional aggregate, and then the waste cement slurry was poured into a mold having a cylindrical mold chamber and then subjected to vibration compaction. After this,
As in Example 1, a normal pressure high temperature curing and a high pressure high temperature curing were sequentially performed, and then the mold was released to provide a porous hardened body having a functional aggregate composed of zeolitic tuff disposed on the surface portion. An adsorbent consisting of was obtained.

Example 3 Next, in the waste cement slurry, that is, in the concrete pile manufacturing process, the waste cement slurry discharged from the mold was added to 100 parts by weight of cement in the waste cement slurry, and chaff 10 By blending parts by weight as a functional aggregate and kneading, pour this mixture into a mold,
In the same manner as in Example 1, normal pressure and high temperature curing and high pressure and high temperature curing were sequentially performed, and then the mold was released to form a porous hardened body containing a functional aggregate composed of chaff charcoal. An adsorbent was obtained.

Example 1, Example 2 and Example 3
The adsorption capacity test of ammonia nitrogen, phosphorus orthophosphate, and agricultural chemicals (isoprothiolane) was conducted in the following manner. Further, the ion exchange capacity of the powder obtained by crushing these Example 1, Example 2 and Example 3 was measured.

In the adsorption capacity test for ammoniacal nitrogen, the initial concentration of ammoniacal nitrogen was 70 mg / L, 20 mg / L,
And 1 mg of the test liquid were adjusted with ammonium sulfate (special grade reagent) so as to be 5 mg / L, and Example 1, Example 2 and Example 3 were immersed in separate 1 L test liquids in the form of a lump and stirred. With gentle stirring for 0 hours, 4 hours, 2
The ammonia nitrogen concentration after 4 hours was measured by the indophenol blue absorptiometry and the removal rate was calculated.

As a result, as shown in Table 1, Table 2, Table 3, FIG. 4, FIG. 5, FIG. 6, FIG. 7, FIG. 8 and FIG.
3 to 24, the removal rate of ammonia nitrogen after 24 hours reached 49% to 74%, and the removal rate at the high concentration level (70 ppm) was medium concentration level in the order of Example 2> Example 1> Example 3. It was confirmed that the removal rate of (20 ppm) was in the order of Example 3> Example 2> Example 1, and the removal rate of medium concentration level (20 ppm) was in the order of Example 1> Example 2> Example 3.

[0108]

[Table 1]

[0109]

[Table 2]

[0110]

[Table 3]

[0111] The orthophosphate phosphorus adsorption capacity test was carried out by adjusting 1 L of the test solution with potassium dihydrogen phosphate (special grade reagent) so that the concentration of orthophosphate phosphorus was 50 mg / L and 5 mg / L. Each of Example 1, Example 2 and Example 3 was immersed in a separate 1 L of the test solution as a lump, and the orthophosphorus phosphorus at the time of 0 hours, 4 hours, and 24 hours was slowly stirred with a stirrer. The concentration was measured by molybdenum blue absorptiometry and the removal rate was calculated.

As a result, Tables 4 and 5, FIG. 10, FIG.
As shown in FIGS. 12 and 13, a high concentration level (50 pp
The removal rate in m) is 13.3 to 32.7% and the removal effect is low, but the removal rate at a low concentration level (5 ppm) is 90.0 to
A very high removal effect is recognized at 98.6%. In each case, the order of Example 3> Example 2> Example 1 was found, and it is recognized that the removal rate of Example 1 is slightly lower than that of the other Examples.

[0113]

[Table 4]

[0114]

[Table 5]

The pesticide adsorption capacity test was carried out by diluting an insecticide isoprothiolane (a standard 1000 mg / L acetone solution) with acetone to prepare a test solution having a concentration of 2 mg / L. And Example 3 are immersed in separate test liquids in the form of lumps and stirred with a stirrer at 0
The residual pesticide concentration after 24 hours had passed was measured by GC / MS, and the removal rate was calculated.

As a result, as shown in Table 6, FIG. 14 and FIG. 15, it was confirmed that the removal rate of isoprothiolane in each Example after 24 hours was 20 to 30%. In addition,
It can be seen that the removal rate of Example 2 is slightly lower than the other Examples.

[0117]

[Table 6]

The ion exchange capacity (CEC) was measured by placing 20 g of the powder obtained by crushing Example 1, Example 2 and Example 3 in 100 mL of ammonium acetate solution and allowing it to stand overnight, then filtering the solution. The residue is washed with methanol. The washed residue was subjected to substitution extraction with 10% sodium chloride solution for ammonia ion (NH ₄ +), the ammonia ion (NH ₄ +) was analyzed by the neutralization titration method, and the ion exchange capacity was determined.

As a result, as shown in Table 7, the ion exchange capacity of Example 2 was the largest, followed by Example 3 and Example 1. Moreover, the ion exchange capacity of Example 3 reaches about 3 times that of Example 1.

It can be said that there is not much correlation between the ion exchange capacity and the ammoniacal nitrogen absorption capacity.

[0121]

[Table 7]

By the way, in the above-mentioned Examples 2 and 3, the above-mentioned slurry was mixed with the functional aggregate, but the slurry may be mixed with the functional aggregate or in place of the functional aggregate, for example, iron ore. The specific gravity of the present invention can be adjusted by incorporating an aggregate made of stone. When this specific gravity adjusting aggregate is mixed to adjust the specific gravity of the present invention to around 3.0,
The present invention has a specific gravity similar to that of a cobblestone and can prevent the present invention, which has been put into running water, from being swept away by the force of a water stream.

[0123]

As described above, the adsorbent according to the present invention contains 70 to 15 parts of water per 100 parts by weight of cement.
A cement slurry composed of 0 to 50 parts by weight and 5 to 50 parts by weight of a powdery or granular mineral material containing silica and alumina as main components is formed and cured by sequentially performing normal pressure high temperature curing and high pressure high temperature curing. , as well as the porous structure, said sheet
Powdery or granular ore containing mainly lyca and alumina
Since a zeolite analogue is produced by the hydrothermal reaction of a material, a porous hardened body containing the zeolite analogue is formed, and the action of this zeolite analogue causes ammoniacal nitrogen, orthophosphate phosphorus, and agrochemicals from water. As a result of being able to adsorb and remove water pollutants such as, by introducing and laying the adsorbent of the present invention into rivers, lakes, drainage facilities, etc.
The water pollutants are removed from the water flowing therethrough or the water stored therein to improve the water quality and to purify the water.

However, the adsorbent according to the present invention is formed in a block shape and laid as a revetment material on a river floor or the bottom of a lake, as a revetment material on a shore, or a frame revetment laid on a shore. It may also be incorporated into, to improve the water quality by removing water pollutants from the water contacting the adsorbent of the present invention, which constitutes a part of these revetment materials, revetment materials or framework revetments, The effect that purification can be achieved is obtained.

Further, the adsorbent according to the present invention contains a zeolite analogue, and by its function it is possible to adsorb nitrogen oxides, sulfur oxides, malodorous components and the like in the atmosphere to purify the atmosphere. The effect that it can be used as an adsorbent for air purification is obtained.

Further, since the adsorbent according to the present invention is porous, it is used as a building material for enhancing the comfort of living space such as underfloor humidity control material, humidity control wall material, deodorant wall material, heat insulating material, sound absorbing material and the like. Can also be used.

In addition, since the adsorbent according to the present invention is a porous hardened material containing a zeolite analogue, it is possible to diffuse the previously adsorbed fertilizer or soil conditioner into the soil or to support the nutrients in the soil. As a result, it can be used as an agricultural material, a horticultural material, or a civil engineering material that enhances soil fertility.

In the present invention, instead of using a new material such as cement, a waste cement slurry produced in the process of producing a cement product can be used. In this case, it is generated during the production of the cement product. When water or cement or a powdery or granular mineral material containing silica and alumina as main components is added to the waste cement slurry to be adjusted to a unit volume weight of 1.3 to 1.7 t / m ³ , the waste cement slurry Water cement ratio of 70-150
%, Or the component ratio thereof becomes the above-mentioned required range, which is cured by normal pressure high temperature curing and high pressure high temperature curing one after another to form a porous structure and at the same time as the silica content and
Hydrothermal heat of powdery or granular minerals containing lumina as the main component
By producing a zeolite analog by the reaction ,
Since special equipment and labor are not required, the cost can be particularly low, and the waste cement slurry that has been treated as industrial waste can be effectively used as the raw material of the present invention, and this treatment cost is not required. Therefore, it is possible to obtain the effect of significantly increasing the economic efficiency of the factory.

Further, in the present invention, the adsorbability can be enhanced by blending the cement slurry with the functional aggregate. For example, 10% to 40% by weight of cement
When the functional aggregate composed of the zeolitic tuff is mixed, the effect of increasing the adsorption ability of ammoniacal nitrogen and orthophosphate phosphorus can be obtained. Further, when a functional aggregate composed of chaff charcoal in a weight ratio of 5 to 15% with respect to cement is blended with the slurry, an effect of enhancing the adsorption capacity of medium-concentration levels of ammonia nitrogen and orthophosphate phosphorus can be obtained. it can.

Furthermore, in the present invention, when an aggregate having a large specific gravity, for example, an aggregate composed of iron ore, is mixed in the cement slurry so that the specific gravity of the hardened product becomes 2.5 to 3.5, the adsorption according to the present invention The specific gravity of the material becomes the same as that of natural cobblestone in water, and it is possible to obtain the effect of preventing the adsorbent of the present invention from being washed away by the water force.

[Brief description of drawings]

FIG. 1 is a flow chart of a manufacturing process of the present invention.

FIG. 2 is a temperature control characteristic diagram of normal pressure high temperature curing of the present invention.

FIG. 3 is a temperature control characteristic diagram of high pressure and high temperature curing of the present invention.

FIG. 4 is a characteristic diagram of high concentration level ammoniacal nitrogen concentration change characteristic of the present invention.

FIG. 5 is a characteristic diagram of the medium concentration ammonia nitrogen concentration change characteristic of the present invention.

FIG. 6 is a characteristic diagram of a low concentration level ammoniacal nitrogen concentration change characteristic of the present invention.

FIG. 7 is a characteristic diagram of a high concentration level ammoniacal nitrogen removal rate of the present invention.

FIG. 8 is a characteristic diagram of a medium concentration level ammoniacal nitrogen removal rate of the present invention.

FIG. 9 is a low concentration level ammoniacal nitrogen removal rate characteristic diagram of the present invention.

FIG. 10 is a concentration characteristic diagram of the high concentration level orthophosphate phosphorus according to the present invention.

FIG. 11 is a concentration characteristic diagram of the low concentration level orthophosphate phosphorus according to the present invention.

FIG. 12 is a characteristic diagram of a high concentration level orthophosphate phosphorus removal rate of the present invention.

FIG. 13 is a characteristic diagram of a low concentration level orthophosphate phosphorus removal rate of the present invention.

FIG. 14 is a concentration characteristic diagram of isoprothiolane of the present invention.

FIG. 15 is a characteristic diagram of the removal rate of isoprothiolane according to the present invention.

Continuation of front page (51) Int.Cl. ⁷ Identification code FI E02B 15/10 E02B 15/10 B // C02F 1/20 C02F 1/20 Z E04B 1/16 E04B 1/16 D (56) References Kaihei 11-77078 (JP, A) JP 3-42096 (JP, A) JP 10-192843 (JP, A) JP 11-278958 (JP, A) JP 10-1374 ( (58) Fields surveyed (Int.Cl. ⁷ , DB name) B01J 20/10 B01D 53/26 101 B01D 53/28 C04B 38/08 C04B 40/02 E02B 15/10 C02F 1/20 E04B 1/16

Claims (5)

(57) [Claims] 1. 70 parts of water to 100 parts by weight of cement
˜150 parts by weight and 5 to 50 parts by weight of a powdery or granular mineral material containing silica and alumina as main components are formed, and this is sequentially subjected to normal temperature high temperature curing and high pressure high temperature curing. , Hardened and made into a porous structure ,
A powder or a mixture containing the above silica and alumina as main components
Zeolite analogues formed by hydrothermal reaction of granular mineral materials
Adsorbent, characterized in that formed by deposition. 2. A unit volume weight of 1.3 to 1. is obtained by adding water or cement, or a powdery or granular mineral material containing silica and alumina as main components to a waste cement slurry generated during the production of cement products. It was adjusted to 7 t / m ^{3 and} was cured by normal pressure high temperature curing and high pressure high temperature curing one after another to form a porous structure, and the silica and alumina components were mainly contained.
By hydrothermal reaction of powdery or granular mineral material as an ingredient
An adsorbent characterized by producing a zeolite analogue . 3. The adsorbent according to claim 1, wherein 5 to 50 parts by weight of a functional aggregate having an adsorbing function is mixed with 100 parts by weight of cement in the cement slurry. 4. The functional aggregate is at least one selected from zeolite, zeolitic tuff, porous iron oxide or porous mineral materials such as pearlite, activated carbon or chaff.
The adsorbent according to any one of claims 1 to 3, which is a seed. 5. An adsorbent in which an aggregate such as iron ore is mixed in a cement slurry so that the adsorbent according to any one of claims 1 to 4 has a specific gravity of 2.5 to 3.5. .