JP2002088676A - Papermaking sludge processing method and processing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hardened body having high density in mass production level. SOLUTION: Papermaking sludge separated from pulp 84 by a water washer (80) is dehydrated by a screw press 92 to produce a block-like papermaking sludge 11B. Water is added to the block-like papermaking sludge 11B to adjust the consistency and then sheet-making is effected by using filtered water. That is, dehydrating the papermaking sludge separated in a paper mill makes it easier to transport the papermaking sludge to a papermaking sludge processing facility provided with filtered water; thus, a hardened body can be produced from papermaking sludge in a commercially profitable manner.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for treating papermaking sludge which can effectively utilize papermaking sludge generated during recycling of used paper.

[0002]

2. Description of the Related Art Effective utilization of various industrial wastes has been studied in recent years from the viewpoint of protecting the global environment. For example, in the construction industry, which has consumed a large amount of forest resources until now, new construction materials are required for industrial waste,
It has been proposed to reduce the consumption of forest resources.

[0003] For example, Japanese Patent Application Laid-Open No. 55-12853 discloses a papermaking sludge such as an old newspaper which is wire-pressed, dehydrated, dried with a dryer, and finally hot-pressed. JP-A-52-90585 discloses a cured product obtained by paraffin-coating the surface of a cured product of papermaking sludge. Further, JP-A-50-10
No. 1604 discloses a cured product obtained by mixing papermaking sludge and glass fiber.

[0004]

However, none of the techniques can increase the density sufficiently, and problems such as dimensional stability and warpage when absorbing moisture still remain. An object of the present invention is to produce a cured product having a high density at a mass production level, to secure the dimensional stability of the cured product when absorbing moisture, and to prevent warpage.

[0005]

Means for Solving the Problems As a result of intensive studies, the inventors have found that the density of the cured product is low and the dimensional stability is poor.
It was found that the fibers of the waste paper were not loosened, and the extraction of inorganic components between the fibers was insufficient. In addition, it has been found that the fibers can be entangled uniformly because of insufficient loosening of the fibers. Due to the non-uniformity, the dimensional change rate is large at the time of moisture absorption, and it has been found that warpage occurs.

[0006] The invention of claim 1 includes: (a) a step of cooking paper; (b) a step of separating papermaking sludge from the cooked digest; and (c) a step of drying and curing the papermaking sludge to obtain a cured product. Consists of Since the paper is digested, the fibers of the waste paper are loosened, the inorganic components between the fibers are sufficiently extracted, and a high-density composite cured product is obtained.

Further, since the fibers are uniformly entangled, the rate of dimensional change during moisture absorption is small, and no warping occurs.
Needless to say, this effect can be similarly applied to the second and subsequent inventions.

[0008] In order to solve the above-mentioned problems, the method for producing a cured product according to claim 2 is characterized by comprising at least the following steps: (a) a step of digesting paper; Washing the digested water with water to separate papermaking sludge; (c) papermaking a raw material solution containing the papermaking sludge using a filter body, attaching a papermaking sludge paperwork to the surface of the filter body, and forming the papermaking sludge. (D) curing the papermaking body to obtain a cured papermaking sludge.

In the present invention, the papermaking sludge is formed by using a filter body, the papermaking sludge sheet is adhered to the surface of the filter body, and the sheet is transferred to a conveyor belt, and the transferred sheet is cured. By doing so, a cured product that can be used as a floor material, a wall material, and the like can be obtained from papermaking sludge. Here, since the paper is continuously formed using the drainage body, a cured product obtained by solidifying the papermaking sludge can be mass-produced efficiently.

[0010] The method for treating papermaking sludge according to claim 3 is characterized by comprising at least the following steps: (a) a step of digesting the paper; (b) washing the digested cooked product with water, (C) a step of dewatering the separated papermaking sludge; (d) a step of adding water to the dewatered papermaking sludge to adjust the concentration; (e) a raw material solution containing the papermaking sludge whose concentration has been adjusted. Papermaking using a drainage body, attaching a papermaking sludge papermaking body to the surface of the filtration body, and transferring the papermaking body to a conveyor belt; (f) curing the papermaking body to obtain a cured papermaking sludge. Process.

According to the third aspect, the separated papermaking sludge is dewatered. Then, water is added to the dewatered papermaking sludge to adjust the concentration, and then papermaking is performed using a filter body. In other words, by dewatering the papermaking sludge separated at the papermaking plant, it is easy to transport the papermaking sludge to a treatment facility for papermaking sludge having a drainage body, and a cured product is manufactured from the papermaking sludge so that it is commercially profitable. be able to.

According to a fourth aspect of the present invention, the solid content is reduced by 5 to 50 by dehydration.
%. If the solid content exceeds 50%, a demolition facility is required to adjust the concentration by adding water in a subsequent step. On the other hand, if it is less than 5%, it becomes liquid and is inconvenient to handle, and the weight increases to reduce the transport efficiency.

The method for treating papermaking sludge according to claim 5 is characterized by comprising at least the following steps: (a) a step of cooking paper; (b) a step of washing the cooked digested product with water to form papermaking sludge. (C) a step of precipitating the separated papermaking sludge; (d) a raw material solution containing the precipitated papermaking sludge is made using a filter body, and a papermaking sludge sheet is attached to the surface of the filter body. And transferring the paper to a conveyor belt, and (e) curing the paper to obtain a cured papermaking sludge.

According to a fifth aspect of the present invention, the digested paper is washed with water to precipitate papermaking sludge separated from pulp, and then a raw material solution containing the precipitated papermaking sludge is formed using a filter body. That is, since the papermaking sludge separated from the pulp is precipitated and then formed, the concentration of the papermaking sludge is easily adjusted, and the cured product can be manufactured from the papermaking sludge so that it is commercially profitable.

[0015] The method for treating papermaking sludge according to claim 6 is characterized in that it comprises at least the following steps: (a) a step of digesting the paper; (b) washing the digested cooked product with water, (C) a step of adjusting the concentration of the separated papermaking sludge; (d) a raw material solution containing the papermaking sludge whose concentration has been adjusted is formed using a filter body, and the papermaking sludge is formed on the surface of the filter body. A step of adhering the paper body and transferring the paper body to a conveyor belt; and (e) a step of curing the paper body to obtain a cured papermaking sludge.

In claim 6, the digested paper is washed with water, the concentration of the papermaking sludge separated from the pulp is adjusted, and a raw material solution containing the adjusted papermaking sludge is formed using a filter body, and the surface of the filter body is coated on the surface of the filter body. The papermaking sludge is deposited. That is, to make paper sludge separated from pulp without performing dehydration and water equivalent to dewatered components,
A cured product can be produced from papermaking sludge to make it commercially viable.

In the present invention, the solid content is adjusted to 3 to 6 by adjusting the concentration.
%, It is possible to produce paper sludge separated from pulp without dewatering and adding water equivalent to the dewatered amount, and it is possible to produce a cured product from paper sludge so that it is commercially profitable. it can.

The technical feature of the paper sludge treatment apparatus according to claim 9 is characterized by comprising at least the following: (a) a digester for digesting paper; (b) washing the digested digest with water, A washing device for separating sludge; (c) a filter body for forming a raw material solution containing papermaking sludge and adhering a papermaking sludge paperwork to the surface; (d) a transfer belt for transferring the paperwork on the surface of the filter body; (E) a cutting device for cutting the filter body of the transfer belt; (f) a curing device for hardening the cut filter body.

In the ninth aspect of the invention, the papermaking sludge is formed by using a filter body, the papermaking sludge sheet is adhered to the surface of the filter body, and the sheet is transferred to a conveyor belt, and the transferred sheet is cured. By doing so, a cured product that can be used as a building material such as a floor material and a wall material can be obtained from papermaking sludge. Here, in order to continuously make paper using a filter body,
It is possible to mass-produce a cured product obtained by solidifying papermaking sludge efficiently.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, the structure of a composite cured product produced by the method for producing a composite cured product of the present invention, which will be described later, will be described with reference to the schematic diagram of FIG. The composite cured body 1 is composed of an inorganic amorphous body 2 composed of two or more oxides.
And that the organic fibrous material 3 is mixed in the inorganic amorphous body 2. Here, the inorganic amorphous body composed of two or more oxides refers to an oxide (1) -oxide (2)... -Oxide (n) (where n is a natural number, Oxide (1), oxide (2), ... oxide (n)
Are different oxides).

It is difficult to accurately define such an amorphous substance, but it is an amorphous compound that is formed by solid solution or hydration reaction of two or more oxides. Conceivable. Such inorganic amorphous compounds are analyzed by fluorescent X-ray analysis to determine the elements (Al, Si,
Ca, Na, Mg, P, S, K, Ti, Mn, Fe, Z
and at least two types selected from n), and a halo is observed in the range of 2θ: 10 ° to 40 ° in the analysis chart by X-ray diffraction. This halo is a gentle undulation of the intensity of the X-ray, and is observed as a broad swell on the X-ray chart. The halo has a half width of 2θ:
2 ° or more.

First, the above-mentioned composite cured product 1 is made of an inorganic amorphous material 2
Becomes a strength developing material, and the organic fibrous material 3 is dispersed in the inorganic amorphous material 2 to improve the fracture toughness value, so that the bending strength value and impact resistance can be improved. Also,
A homogeneous cured product having no anisotropy in strength can be obtained. Furthermore, since it is an amorphous body, there is an advantage that sufficient strength can be obtained at a low density.

The reason why the above-mentioned amorphous material becomes a strength-expressing substance is not clear, but it is presumed that the above-mentioned amorphous body inhibits the progress of cracks as compared with the crystalline structure. Further, since the fibrous material is more easily dispersed uniformly in the amorphous state than in the crystalline state, it is considered that the fracture toughness value is also improved. As a result, even if a nail is driven or a through hole is provided,
Since cracks do not occur, it is optimal for materials that require processing, such as building materials.

Here, as the oxide, a metal and / or non-metal oxide can be used, and Al ₂ O ₃ , Si
O ₂ , CaO, Na ₂ O, MgO, P ₂ O ₅ , SO ₃ ,
It is desirable to be selected from K ₂ O, TiO ₂ , MnO, Fe ₂ O ₃ and ZnO. In particular, Al ₂ O ₃ —S
iO ₂ -CaO-based or Al ₂ O ₃ -SiO ₂ -CaO
-An amorphous body composed of an oxide or a composite of these amorphous bodies is optimal. The oxide in the latter amorphous body is at least one kind of metal and / or non-metal oxide except Al ₂ O ₃ , SiO ₂ and CaO.

First, an amorphous body composed of the Al ₂ O ₃ —SiO ₂ —CaO system includes Al ₂ O ₃ , SiO ₂ and CaO.
Is a compound having an amorphous structure in which all or a part of each component is formed by solid solution or hydration reaction with each other. That is, Al ₂ O ₃ and SiO ₂ , SiO ₂ and Ca
O, Al ₂ O ₃ and CaO, and Al ₂ O ₃ , SiO ₂
It is considered to include any of the compounds formed by causing a solid solution or a hydration reaction or the like with a combination of CaO and CaO.

Such an inorganic amorphous compound has a fluorescent X
Al, Si, and Ca were confirmed by the line analysis, and the halo was observed in the range of 2θ: 10 ° to 40 ° in the analysis chart by X-ray diffraction.

Further, Al ₂ O ₃ , SiO ₂ and CaO
Other than at least one oxide, ie, Al
_The amorphous body composed of ₂ O ₃ —SiO ₂ —CaO—oxide system includes, in addition to the combination of the above Al ₂ O ₃ —SiO ₂ —CaO system, Al ₂ O ₃ and oxide, and SiO ₂ and oxide , C
aO and oxide, Al ₂ O ₃ and SiO ₂ and oxide, SiO
₂ and CaO and an oxide, Al ₂ O ₃ and CaO and an oxide, or a compound formed by performing a solid solution or hydration reaction with a combination of Al ₂ O ₃ and SiO ₂ and CaO and an oxide. It is considered to include.

It should be noted that the number of oxides is two or more, that is, Al
_{If it is a 2} O ₃ —SiO ₂ —CaO—oxide (n) -based (n is a natural number of 2 or more) amorphous material, these oxides, for example, oxide (1), oxide (2). ..Oxide (n)
(N is a natural number of 2 or more, and the oxide (n) means a different oxide if the value of n is different, and
₂ O ₃ , SiO ₂ , and CaO), and a compound formed by performing a solid solution or hydration reaction with at least two combinations selected from the group consisting of Al ₂ and Al _2.
Compounds formed by performing a solid solution or hydration reaction with at least two kinds of combinations selected from O ₃ , SiO ₂ , and CaO, and oxides (1), oxides (2),.
At least one selected from oxides (n) (n is a natural number of 2 or more) and Al ₂ O ₃ , SiO ₂ , Ca
It is considered to include any of the compounds formed by solid solution or hydration reaction in combination with at least one selected from O.

Such an inorganic amorphous compound has a fluorescent X
According to the line analysis, in addition to Al, Si and Ca, the elements (Na, Mg, P, S, K, Ti, Mn, F
e, Zn at least two types), and in the analysis chart by X-ray diffraction, 2θ: 10 ° to
The halo is seen in the range of 40 °.

Here, Al ₂ O ₃ , SiO ₂ and Ca
Oxides to be combined with O are one kind or two or more kinds, and are metals other than Al ₂ O ₃ , SiO ₂ and CaO and / or
Alternatively, non-metal oxides can be used, such as Na ₂ O, M
gO, P ₂ O ₅ , SO ₃ , K ₂ O, TiO ₂ , MnO,
It can be selected from Fe ₂ O ₃ and ZnO. This selection can be made based on the characteristics expected of the composite cured product.

For example, since Na ₂ O or K ₂ O can be removed with an alkali or the like, if the removal treatment is performed prior to the plating treatment, the surface to be plated on the surface of the composite hardened body is roughened and acts as an anchor for plating. be able to. Mg
O forms a solid solution with Al ₂ O ₃ , SiO ₂ , and CaO to contribute to strength development, and greatly improves bending strength and impact resistance. P
₂ O ₅ is particularly advantageous when used for biomaterials (artificial roots, artificial bones) to aid adhesion with bone. SO ₃
Has a bactericidal action and is suitable for antibacterial building materials. TiO
₂ is a white colorant and also acts as a photo-oxidation catalyst, so it can forcibly oxidize attached organic pollutants and can be cleaned only by irradiating light. Has a unique effect that it can be used as a reaction catalyst. MnO is useful as a dark colorant, Fe ₂ O ₃ is useful as a light colorant, and ZnO is useful as a white colorant. These oxides may be present alone in the amorphous body.

The composition of the above-mentioned amorphous body was made of Al ₂
Al ₂ O ₃ in terms of O ₃ , SiO ₂ and CaO:
3 to 51% by weight based on the total weight of the composite cured body, Si
O ₂ : 6 to 53% by weight based on the total weight of the composite cured product and CaO: 3 to 63% by weight based on the total weight of the composite cured product
And the total content thereof does not exceed 100% by weight. When the content of CaO is 3 to 6% by weight, a material having particularly high fracture toughness can be obtained. When the content is 6 to 63% by weight, the bending strength and the holding power of the nail can be improved.

The reason is that the content of Al ₂ O ₃ is 3% by weight.
If the content is less than 50% or more than 51% by weight, the strength of the composite cured product will be reduced, and if the content of SiO ₂ is less than 6% by weight or more than 53% by weight, the strength of the composite cured product will be reduced. Further, the content of CaO is less than 3% by weight or 63% by weight.
Even when the amount exceeds the weight percentage, the strength of the composite cured product is reduced.

Further, in terms of oxide, CaO / SiO
₂ weight ratio from 0.2 to 7.9, exceeding the 0.2 weight ratio of CaO / Al ₂ O _3, can be adjusted to 12.5 or less, advantageous for obtaining a large hardened body strength is there.

Further, Al ₂ O ₃ , SiO ₂ and CaO
Oxides other than Na ₂ O, MgO, P ₂ O ₅ , S
O ₃ , K ₂ O, TiO ₂ , MnO, Fe ₂ O ₃ and Z
When one or more kinds of nO are contained, the preferred contents of each component are as follows. It goes without saying that the total amount of these oxides does not exceed 100% by weight. Na ₂ O: 0.1 to 1.2% by weight based on the total weight of the composite cured body MgO: 0.3 to 11.0% by weight based on the total weight of the composite cured body P ₂ O ₅ : Composite cured body 0.1 to 3.5% by weight based on the total weight of the composite cured product SO ₃ : 0.1 to 3.5% by weight based on the total weight of the composite cured product K ₂ O: 0 based on the total weight of the composite cured product .1～1.2 wt% TiO _2: from 0.1 to 8.7 wt% MnO, relative to the total weight of the composite hardened product: 0.1 to 1.5 wt% Fe with respect to the total weight of the composite cured body ₂ O ₃ : 0.2 to 17.8% by weight based on the total weight of the composite cured body ZnO: 0.1 to 1.8% by weight based on the total weight of the composite cured body The reason for limiting the range is that if the ratio is outside the above range, the strength of the composite cured body is reduced.

The composition of Si, Al, and Ca referred to in the present invention is the composition in the composite cured product, and is the total composition in the Ca-based crystal and the inorganic amorphous material. Therefore, when an inorganic substance is added, the composition includes the added inorganic substance.

In the present invention, the composition is adjusted by a method of selecting a papermaking sludge having a desired Ca component amount, a method of mixing and adjusting a composition by mixing a plurality of papermaking sludges, and adjusting the composition by adding calcium carbonate or silica sand. The method has been adopted. Papermaking sludge has various compositions, but generally has little Ca component. This is because the pH is made acidic in order to agglomerate the papermaking sludge, so that the Ca component does not remain on the precipitation side. If the desired composition is not available, other papermaking sludge of different composition may be appropriately mixed or
It is necessary to add an inorganic component such as calcium carbonate.

It should be noted that the presence or absence of an amorphous structure can be confirmed by X-ray diffraction. That is, 2θ: 10 ° by X-ray diffraction
If a halo is observed in the region of ４０40 °, it can be confirmed that it has an amorphous structure. In the present invention, in addition to those having a completely amorphous structure, Hydrogen Aluminum Silicate, Kaolinite, Zeolit
e, Gehlenite, syn, Anorthite, Melitite, Gehlenit
e-synthetic, tobermorite, xonotlite, ettringite
Or SiO ₂ , Al ₂ O ₃ , CaO, Na ₂ O, Mg
O, P ₂ O ₅ , SO ₃ , K ₂ O, TiO ₂ , MnO, F
oxides such as e ₂ O ₃ and ZnO, and CaCO ₃
Crystals such as (Calcite) may be mixed.

Although it is not considered that these crystals themselves become a strength-expressing substance, if they have effects such as increasing the hardness and density to improve the compressive strength and suppressing the progress of cracks. Conceivable. The content of the crystal is preferably 0.1 to 50% by weight, particularly preferably 3 to 48% by weight based on the total weight of the composite cured product. This is because if the crystal content is less than 0.1% by weight, effects such as increasing the hardness and density to improve the compressive strength and suppressing the progress of cracks cannot be sufficiently obtained. This is because bending strength is reduced.

Incidentally, the Al ₂ O ₃ —SiO ₂ based crystalline compound is selected from Hydrogen Aluminum Silicate and Kaolini.
te, Zeolite, Al ₂ O ₃ —CaO based crystalline compounds are Calcium Aluminate, CaO—SiO ₂ based crystalline compounds are Calcium Silicate, Al ₂ O ₃ —SiO ₂ —Ca
O-type crystalline compounds are Gehlenite, syn and Anorthite, and Al ₂ O ₃ —SiO ₂ —CaO—MgO-type crystalline compounds are Melitite and Gehlenite-synthetic.
Further, it is desirable that the above-mentioned crystal contains Ca, and Gehlenite, syn (Ca ₂ Al ₂ O ₇ ), Melitite-s
_{ynthetic (Ca 2 (Mg 0.5 Al} 0.5) (Si 1. 5 Al
_0.5 O ₇ )), Gehlenite-synthetic (Ca ₂ (Mg
_0.25 Al _0.75 ) (Si _1.25 Al _0.75 O ₇ )), Anorthit
e, ordered (Ca ₂ Al ₂ Si ₂ O ₈ ) and calcium carbonate (Calcite) may be contained.

In the composite cured product produced by the production method of the present invention, a halogen may be added to an amorphous material composed of at least two oxides. The halogen serves as a catalyst for a solid solution or hydrate formation reaction and also acts as a combustion suppressing substance. Its content is 0.1-1.
2% by weight is desirable. This is because if it is less than 0.1% by weight, the strength is low, and if it exceeds 1.2% by weight, harmful substances are generated by combustion. As the halogen, chlorine, bromine and fluorine are desirable.

Similarly, calcium carbonate (Calcite) may be added. Calcium carbonate itself is not a strength-expressing substance, but it is thought that by surrounding the calcium carbonate with an amorphous body, it contributes to strength improvement by actions such as inhibiting the progress of cracks. The content of the calcium carbonate is 48 to the total weight of the composite cured product.
% By weight or less is desirable. The reason for this is that if it exceeds 48% by weight, the bending strength is reduced. Further, the content is desirably 0.1% by weight or more. If the content is less than 0.1% by weight, it does not contribute to the improvement in strength.

Further, the addition of a binder is advantageous for further improving the strength and for improving the water resistance, chemical resistance and fire resistance. The binder desirably comprises one or both of a thermosetting resin and an inorganic binder. As thermosetting resins, phenolic resins,
At least one resin selected from melamine resin, epoxy resin and urea resin is desirable. The inorganic binder is preferably at least one selected from the group consisting of sodium silicate, silica gel and alumina sol.

Next, in the method for producing a composite cured product of the present invention, the organic fibrous material mixed with the inorganic amorphous material is an organic fibrous material composed of polysaccharides. This is because polysaccharides have an OH group, and Al ₂ O ₃ ,
This is because they are easily bonded to various compounds of SiO ₂ or CaO.

The polysaccharide is desirably at least one compound selected from amino sugars, uronic acids, starch, glycogen, inulin, lichenin, cellulose, chitin, chitosan, hemicellulose and pectin. As the organic fibrous material comprising these polysaccharides, in general, pulp, pulp grounds, and crushed waste paper such as newspapers and magazines are advantageously suited.

The content of the fibrous material is 2 to 75.
% By weight. The reason for this is that if the content is less than 2% by weight, the strength of the composite cured product is reduced, while if it exceeds 75% by weight, the fire protection performance, water resistance, dimensional stability and the like may be reduced. Further, the average length of the fibrous material is desirably 10 to 1000 μm. If the average length is too short, no entanglement occurs, and if the average length is too long, voids are formed and the strength of the composite cured product is likely to decrease.

The above composite cured product 1 is optimally obtained by drying and coagulating and curing paper sludge (scum). That is, the papermaking sludge is a pulp residue containing an inorganic substance, contains an organic fibrous substance, is low in cost because industrial waste is used as a raw material, and contributes to solving environmental problems. Moreover, this papermaking sludge itself has a function as a binder, and is kneaded with itself or with other industrial waste.
It has the advantage that it can be formed into a desired shape.

Further, in the papermaking sludge, in addition to pulp, Al ₂ O ₃ , SiO ₂ , CaO, Na ₂ O, Mg
O, P ₂ O ₅ , SO ₃ , K ₂ O, TiO ₂ , MnO, F
It generally contains a crystal of e ₂ O ₃ and ZnO or a sol that is a precursor of these oxides, or a composite thereof, at least one selected from halogen and calcium carbonate, and water.

Here, as shown in FIG.
It is advantageous to mix the inorganic particles 4 therein to improve the fire resistance or to form a strength-expressing substance by reacting with the amorphous material to improve the strength. By doing so, the specific gravity of the composite cured product can also be adjusted.

As the inorganic particles 4, at least one selected from calcium carbonate, calcium hydroxide, shirasu, shirasu balloon, perlite, aluminum hydroxide, silica, alumina, talc, calcium carbonate, and industrial waste powder is used. it can. In particular, as the industrial waste powder, it is desirable to use at least one or more types of industrial waste powder selected from calcined powder of papermaking sludge, grinding dust of glass, and crushed silica sand. This is because by using these industrial waste powders, cost reduction can be realized and furthermore, it can contribute to solving environmental problems.

The inorganic particles obtained by calcining the papermaking sludge can be obtained by heating the papermaking sludge at 300 to 1500 ° C. The inorganic particles thus obtained are:
Since it is amorphous, has excellent strength and toughness, and has a low density, it can be reduced in weight by being dispersed in a composite cured product. In addition, the papermaking sludge is kept at 300 ° C or more and 800 ° C or more.
The inorganic particles obtained by quenching at less than or less than 300 ° C. and then heat-treating at 300 to 1500 ° C. are advantageous because they surely contain an amorphous body. It is desirable that the inorganic particles 4 have a specific surface area of 0.8 to 100 m ² / g. If it is less than 0.8 m ² / g, the contact area between the amorphous material and the inorganic particles becomes small and the strength is reduced.
If it exceeds m ² / g, effects such as crack development and improvement in hardness are reduced, and as a result, strength is reduced.

Further, the inorganic particles 4 may contain at least one inorganic substance selected from silica, alumina, iron oxide, calcium oxide, magnesium oxide, potassium oxide, sodium oxide, and phosphorus pentoxide. desirable. This is because they are chemically stable and have excellent weather resistance, and have desirable characteristics as industrial materials such as building materials.

If the average particle diameter of the inorganic particles 4 is too small or too large, sufficient strength cannot be obtained.
It is desirably in the range of 〜100 μm. The content of the inorganic particles is desirably 10 to 90% by weight. That is, if the amount of the inorganic particles is too large, the strength is lowered, and if the amount of the inorganic particles is too large, the strength becomes brittle, and in any case, the strength is lowered.

Composite cured product 1 produced by the method of the present invention
Is used in various industries, calcium silicate plate,
It can be used as a new building material to replace perlite board, plywood, gypsum board, sound insulation, vibration damping material, etc.

Next, an embodiment of a method and an apparatus for treating paper sludge according to the present invention will be described with reference to FIGS. As the papermaking sludge used in the production method of the present invention, high-quality waste paper (recovered paper such as cardboard, newspaper, books excluding magazines, printing / information paper, kraft paper, etc.)
A cured product is produced from papermaking sludge generated in a papermaking plant that manufactures toilet paper and the like.

First, the configuration of the paper mill will be described with reference to FIG. The paper mill is provided with a digester 70 that digests high-quality waste paper with steam while adding caustic soda. In the digester 70, the used paper is stirred by the stirring means 72 to be in a liquid state. The liquid waste paper is washed with a coarse screen 76 to remove coarse foreign substances (fibers of book spine, vinyl string, etc.), and then water is poured from above onto a 60 mesh screen 82. At 80, it is separated into pulp 84 and papermaking sludge (drainage). That is, this waste water is composed of paper sludge (inorganic material and fine pulp) and water.

The waste water from the water washer 80 is led to a sedimentation tank 86, where the papermaking sludge is settled. This sedimentation tank 86
May add papermaking sludge discharged from other processes, for example, papermaking sludge discharged in the process of making kraft pipe. Here, it is desirable to add a flocculant in order to increase the precipitation speed. The supernatant liquid 8 of the settling tank 86
8 is returned to the washing machine 80, partly used for separating pulp and papermaking sludge, and the rest is treated as wastewater. Aluminum flocculants, ferric chloride,
A floc (amount of 0.01 to 5%) composed of any of polyaluminum chloride, sodium polyacrylate, polymethacrylate, polyacrylate, and polyacrylamide can be used.

On the other hand, the papermaking sludge 87 settled in the sedimentation tank 86 is dewatered by a screw press 92 having a pair of screws opposed to each other to produce a block-shaped papermaking sludge 11B having a solid content of 5 to 50%. . By making the liquid papermaking sludge into a block shape, transportation and handling of the cured body to a manufacturing apparatus for a cured body described later are facilitated. here,
If the solid content exceeds 50%, a digestion facility is required to adjust the concentration to 0.5 to 25% by weight, which can be formed by adding water in a subsequent step, and the production cost of the cured product increases. On the other hand, if it is less than 5%, the efficiency of transportation is reduced, and handling is difficult because it is liquid. Instead of using the screw press 92, a belt suspended by rollers is dewatered using a screen dewatering machine 96 that is arranged to face each other, and then cut to obtain a mat or flake having a solid content of 5 to 50%. It is also preferable to manufacture the papermaking sludge 11F.

FIG. 4 shows the overall configuration of a manufacturing apparatus for manufacturing a cured product from the above-described block-shaped papermaking sludge 11B having a solid content of 5 to 50% or mat-shaped or flake-shaped papermaking sludge 11F. In the first embodiment, the above-described paper mill and the apparatus for manufacturing a cured body are placed in a remote place, and the block, mat, or flake-shaped paper sludges 11B and 11F are used to manufacture the cured body from the paper mill. It is transported to the device. The apparatus for producing a cured product includes a raw material adjusting mechanism 1 for adjusting the water content of the papermaking sludge and generating a slurry 14.
0, a papermaking mechanism 20 for papermaking the paper 26 from the slurry 14, a reversing device 40 for reversing the paper 26,
Press machine 5 for dehydrating by pressing after laminating papermaking body 26
0 and a dryer 60 for drying the pressed paper to form a cured product 1.

First, a raw material adjusting mechanism 10 for adjusting the raw material
Will be described with reference to FIG. Solid content 5-50%
The block-shaped papermaking sludge 11B or the mat-shaped, flake-shaped papermaking sludge 11F is put into the mixer 13,
Water is poured to a concentration of 0.5 to 25% by weight solids. Then, a coagulant (a flocculant: added amount of 0.01 to 5%) composed of any one of aluminum sulfate, ferric chloride, polyaluminum chloride, sodium polyacrylate, polymethacrylate, polyacrylate, and polyacrylamide ) And organic fibers such as vinylon fibers (binder: additive amount: 0.1 to 10% by weight) are added and mixed in a mixer 13 to prepare a slurry 14. As the organic fiber (binder), synthetic fibers such as polyethylene, polypropylene, and vinylon, pipes, pulp recovered from waste paper, and other fibrous industrial wastes can be used. As a raw material, various inorganic powders and resins can be further added to papermaking sludge.

The slurry 14 is temporarily stored in a chest tank 18. The chest tank 18 is provided with a stirring propeller so that solids in the raw material do not settle.

Subsequently, the papermaking unit 2 was prepared by the papermaking mechanism 20 from the slurry 14 containing the papermaking sludge whose water content had been adjusted.
6 is generated.

In the present papermaking method, a rotating drum of a mesh body is used.
To produce a cured product, and impurities are removed from the mesh.
Impurities, reducing impurities and increasing brightness.
Is possible. Also contains calcium carbonate
A cured body comprising: Ca, Al,
When the amount of Si is CaO and Al_TwoO_Three, SiO _TwoConvert to
CaO / SiO_TwoWeight ratio of 0.2 to 7.9,
CaO / Al_TwoO_ThreeWeight ratio adjusted from 0.2 to 12.5
As it is adjusted, the Ca component increases and the brightness improves.
You. In addition, strength and nailing performance are also high. others
Therefore, the lightness of the cured product is specified in JIS Z 8721.
It can be N4 or more with a value based on the constant.

In JIS Z 8721, the ideal black lightness is set to 0, the ideal white lightness is set to 10, and the perception of the brightness is equal between the black lightness and the white lightness. Each color is divided into ten parts so as to obtain the rate, and displayed by symbols N0 to N10. The actual measurement of lightness is N0
To N10. In this case, the first place of the decimal point is 0 or 5. The lightness of the cured product is J
Since the value based on IS Z 8721 can be N4 or more, coloring and decoration can be performed.

An inorganic binder such as cement or an organic binder such as a resin may be added to the slurry (raw material solution). The papermaking mechanism 20 will be described with reference to FIG. The papermaking mechanism 20 includes three bats 21A, 21B, and 21C that store the slurry 14, and a wire cylinder 22 that is provided in the bat and that papers the slurry 14.
A, 22B, 22C and wire cylinders 22A, 22
B, a conveyor belt 23 for transferring and conveying the paper body 26 formed by 22C, a rotary drum 30 for winding and cutting the paper body 26 conveyed by the conveyor belt 23 to a predetermined thickness, Cutter 36 for cutting the body 26
And a belt conveyor 38 for conveying the papermaking body 26.

Wire cylinders 22A, 22B, 22C
Has a diameter of 70 cm and a width of 1 mm. In the present embodiment, since the drainage body for draining (papermaking) is constituted by a rotating drum (wire cylinder) composed of a net-like body, the papermaking body 26 can be continuously formed from the raw material solution 14, and the papermaking sludge can be efficiently produced. The mass can be mass-produced. The water that has passed through the wire cylinders 22A, 22B, and 22C passes through a pipe 17a and a vacuum pump 17 as shown in FIG.
Is returned to the mixer 13 shown in FIG.

In this embodiment, three wire cylinders 22A, 22B, and 22C are provided along the conveyor belt 23, and the papermaking body 26 is transferred onto the conveyor belt 23 while being multi-layered. Therefore, the papermaking product 2
6 can be made with high efficiency, and the cured product can be efficiently mass-produced from papermaking sludge. In this embodiment, the rotation speed of the wire cylinder is set to 60 rotations / minute. This rotation speed is desirably 1 to 100 times / minute. From the raw material solution 14, a paper 26 can be formed with high efficiency,
This is because it is possible to efficiently mass-produce the cured product from the papermaking sludge. Here, if the rotating drum is lower than 1 rotation / minute, the papermaking efficiency is low. On the other hand, if the number of rotations exceeds 100 rotations / minute, it becomes difficult to form a sheet with a uniform thickness. In the present embodiment, the wire cylinders 22A, 22A
Although three B and 22C are provided, any number of one or more can be used.

The wire cylinders 22A, 22B,
The mesh of 22C is $ 60 (the number of meshes per inch is 60)
Is formed. Wire cylinders 22A, 22B,
The mesh size of 22C is preferably $ 40 to 150. From the raw material solution (slurry) 14, a papermaking body 26 can be produced with high efficiency,
This is because it is possible to efficiently mass-produce a high-density cured product from papermaking sludge. Here, when the mesh is coarser than # 40, only the inorganic amorphous material comes off from the raw material solution, and the density and strength of the cured product decrease. On the other hand, if the mesh is finer than # 150, the removal of water becomes worse, and it becomes impossible to make a papermaking product from the raw material solution with high efficiency. Since floc is formed in the papermaking sludge (raw material solution) by the coagulant, the papermaking can be performed efficiently.

The concentration of the raw material solution containing papermaking sludge is desirably 0.5 to 25% by weight of solid content. This is because the papermaking property from papermaking sludge can be improved and the cured product can be efficiently mass-produced. That is, if the concentration is less than 0.5%, it cannot be efficiently made from a raw material solution using a wire cylinder (filtration body), and if it exceeds 25%, the uniformity of the product is reduced. 3-6%
It is particularly desirable in terms of papermaking efficiency.

The wire cylinders 22A, 22B, 22C
Conveyor belt 2 that transfers and conveys the paper made by
Numeral 3 is made of felt having a width of 1 m, suspended by rollers 34, provided with a suction box 24 on the back surface, and performing dehydration while suctioning by a vacuum pump 17. That is, the belt 23 adsorbs the moisture of the raw material 14 including the papermaking sludge into the pores of the felt, and the adsorbed moisture is absorbed by the suction box 2.
4 and is adsorbed on the vacuum pump 17 side and returned to the mixer 13 shown in FIG. In the first embodiment, the belt 23
However, instead of this, a porous resin with continuous pores, porous rubber, a material obtained by solidifying inorganic fibers with a binder, a sintered metal, a porous metal, and a block of porous metal For example, a belt hardened with a binder having flexibility such as can be used. In this embodiment,
Since the transport belt 23 is formed of a porous body having continuous pores and is dehydrated while being transported by the transport belt 23, the water content in the papermaking body 26 can be efficiently reduced.

In the present embodiment, the transport speed of the transport belt 23 is set to 48 m / min, and the wire cylinders 22A, 22B, 22C,
The cutting rotary drum 30 and the belt conveyor 38 are driven by a motor (not shown). The transport speed of the transport belt 23 is desirably 5 to 80 m / min. This is because a paper having an appropriate thickness can be formed from the raw material solution with high efficiency, and the cured body can be efficiently mass-produced. Here, if the conveying speed is lower than 5 m / min, the papermaking body can be made thicker, but the papermaking efficiency is low. On the other hand, if the transport speed is 8
If it exceeds 0 m / min, the papermaking article becomes thinner, making it difficult to obtain a uniform thickness and cutting off the papermaking article.

The cutting rotary drum 30, which winds and cuts the papermaking body conveyed by the conveyor belt 23 to a predetermined thickness,
It has a diameter of 64 cm (outer circumference 2 m), and has a storage groove 32 for retaining water on the surface and a piano wire 31 housed in a housing groove 33 located near the groove 32. The cutting rotary drum 30 winds the papermaking body 26 conveyed from the conveyor belt 23 on the surface thereof while forming a multilayered structure.

Then, the papermaking body 26 has a predetermined thickness (1.5
cm), and when this is detected by a sensor (not shown),
The piano wire 31 in the accommodation groove 33 is pushed out. Storage groove 3
At the position along 2, the paper body 26 has a high water content, and when the piano wire 31 is extruded, the paper body 26 is cut along the storage groove 32, and as shown in FIG. Fall. Then, with the rotation of the cutting rotary drum 30 and the transport of the belt conveyor 38, the papermaking body 26 having a predetermined thickness is transported onto the belt conveyor 38 (see FIG. 7B). Here, as shown in FIG. 7C, when the other cut end is conveyed to a position corresponding to the cutter 36, the cutter 36 is lowered to the belt conveyor 38 side, and
The cut end of the paper body 26 and the unstacked paper body conveyed on the conveyor belt 23 are separated.

In the present embodiment, the papermaking material on the conveyor belt 23 is multilayered while being transferred to the rotary drum 30 for cutting, and when the multilayered papermaking material 26 reaches a predetermined thickness, the papermaking material 26 has a predetermined size. Disconnect. Since the papermaking body 26 having a uniform thickness (1.5 cm) and a size (1 m × 2 m) can be continuously formed by the rotary drum for cutting, it is possible to mass-produce the cured body efficiently. .

Further, in this embodiment, a cutter 36 is provided for cutting the papermaking body 26 having one end cut by the cutting rotary drum 30 at regular intervals. Therefore, the papermaking body 26 having a predetermined length (2 m) can be efficiently formed. In addition,
In the present embodiment, the thickness of the papermaking body 26 is set to 1.5 cm, but the thickness is desirably 2 cm or less. If the thickness is 2 cm or less, papermaking is easy, and handling is easy in transportation and the like.

A reversing device 40 for reversing a papermaking product will be described with reference to FIG. In the manufacturing apparatus of the present embodiment, as described later, since the papermaking bodies are alternately stacked while being inverted, the papermaking bodies 26 are inverted every other sheet. A reversing device 40, a conveying device 42 for adsorbing and conveying the papermaking body,
It comprises a table 44 and a reversing plate 46.

As shown in FIG. 8 (A), the papermaking body 26 on the belt
6. The reversing plate 46 is driven, and the
Is inverted (see FIG. 8B). Then, FIG. 8 (C)
4 is transported by the transport device 42 to the press 50 shown in FIG. In addition,
As described above, in the present embodiment, the binder is added to the slurry 14 so that the papermaking body 26 has flexibility to facilitate handling after cutting.

Press 50 for pressurizing and dewatering the papermaking body
Will be described with reference to FIGS. 9 and 10. FIG.
As shown in (A), a press machine 50 includes a female mold 54 having a concave portion 54A and a male mold 52 fitted into the concave portion 54A.
The female mold 54 and the male mold 52 are formed with fine through holes 54a and 52a, respectively, for extracting water generated when the paper is pressed. The press machine 50 is provided with a curtain coater 56 for applying the raw material solution 14 to the papermaking body 26 (FIG. 9).
(B)).

The lamination and pressurization in the press machine 50 will be described. First, as shown in FIG. 9 (A), the cutting rotary drum 30 is turned over by the reversing device 40 described above with reference to FIG. Papermaking body 26 with the contact surface side of the
It is carried in by the transport device 42. Next, as shown in FIG. 9 (B), the raw material solution 14 is applied to the upper surface of the papermaking product 26, that is, the bonding surface with the upper layer papermaking product, by the curtain coater 56. The amount of this raw material solution is
50g / m ² ~500g / m ² are preferred in solids. In addition, although the curtain coater 56 is used here,
Various coating devices such as a roll coater can be used.

As shown in FIG. 9C, as the second layer of the papermaking product, the papermaking product 26 on the belt conveyor 38 is carried into the concave portion 54A of the female mold 54 by the transfer device 42 without being inverted. Thereafter, as shown in FIG. 10 (A), after applying the raw material solution 14, the third layer of the inverted papermaking product 2 is formed.
6 is placed, and after applying the raw material solution 14, the fourth (uppermost) non-inverted papermaking product 26 is placed, and the lamination is completed. Here, four layers are laminated, but any number of two or more sheets may be used, and even one sheet may be used when a thin cured product is manufactured.

Thereafter, the male mold 52 is pushed down, and a pressure press is performed at 60 kg / cm ² (see FIG. 10B). On this occasion,
The water seeping out of the papermaking body 26 is led out through the holes 54a and 52a. Thereafter, the male mold 52 is raised (see FIG. 10C), and the composite cured body 1 formed by pressurization is taken out of the female mold and transported to the dryer 60.

In this embodiment, pressure is applied to the mold (the concave portion 54).
Since the process is performed in A), the papermaking body 26 does not break even when pressurized at a high pressure, and it is possible to produce a high-strength cured product 1 from papermaking sludge at a high yield. Male type 5
Since the through holes 52a and 54a are provided on the second and scalpel sides 54 for removing moisture seeping out of the papermaking body 26, dehydration is performed at the time of pressurization, and a curing step by subsequent drying can be completed in a short time. Further, since a plurality of papermaking sludge papermaking bodies are laminated with the raw material solution 14 interposed therebetween, a multilayer cured body without peeling can be produced.

The pressure press is desirably performed at 10 to 250 kg / cm ² . If the pressing is performed at less than 10 kg / cm ² , the required strength cannot be obtained. Meanwhile, 2
This is because even if the pressure exceeds 50 kg / cm ² , the strength cannot be increased, and the press becomes larger and more expensive.

In the present embodiment, a plurality of papermaking sludge papermaking products obtained by papermaking the raw material solution using a wire cylinder (filtration body) are laminated. Since it is inefficient to obtain a thick paper by papermaking, a thin paper is efficiently formed from papermaking sludge and a cured product having the required strength and thickness is produced by stacking. As a result, the cured product is efficiently mass-produced from the papermaking sludge.

Further, in the production method of the present embodiment, the papermaking sludge is formed into a thickness of 20 mm or less, and the papermaking sludge is efficiently produced and laminated to produce a cured product having the required strength and thickness. I do. For this reason, it is possible to efficiently mass-produce the cured body from the papermaking sludge.

In the present embodiment, the papermaking bodies 26 are laminated while alternately reversing the laminating surface. That is, since the paper bodies 26 are laminated while reversing the direction in which the warpage occurs, the cured body 1 formed by laminating the paper bodies 26 does not warp and delamination does not occur. In addition, the uppermost and lowermost papermaking products are laminated so that the exposed surface is the surface that was in contact with the rotating drum and the uneven surface that was in contact with the conveyor belt 32 made of felt is inside. The surface of the cured product can be smoothed.

Further, in the present embodiment, since a coagulant is added to the raw material solution containing papermaking sludge to cause coagulation, the cured product 1 having a uniform specific gravity (1.2 to 1.3) is mass-produced from papermaking sludge. can do. Further, in the present embodiment,
Since the lamination is performed in the female mold 54, it is not necessary to transfer the laminated papermaking body, which is suitable for mass production. In this embodiment, the form 5
Although the lamination was performed in the step 4, it is also possible to transfer it into the mold after the lamination.

[0086] The press machine 50 is dehydrated and dried under pressure.
After lowering the water content, it will be stored in a warehouse (not shown) for 1 day.
Store for about 90 days and allow to dry naturally until the water content becomes 3%. Thereafter, the resin is completely dehydrated by a dryer 60 shown in FIG. The dryer 60 includes an electric heater 62.
And a fan 64, and performs drying at a temperature of 80 to 200 ° C. The dryer 60 includes an electric heater 62, but an infrared heater, steam, a solar dryer, or the like can be used instead. Since the cured product largely shrinks due to a change in water content, it is preferable to dry the cured product by natural drying for a certain period of time to a certain extent and then to dry it with a drier for shape stability.

The cured product 1 after the drying step is further transported and cut into a predetermined size by a cutting machine (not shown).
The cutting is performed by a cutter or a saw provided on the conveyor. The cut composite cured body 1 is finally inspected for warpage or the like by an inspection machine (not shown). As an inspection machine,
X-ray sensors, infrared sensors and the like can be used. Further, the presence or absence of chipping or cracking may be inspected by an image processing device or the like.

An example of analyzing the composite cured product obtained in the above-mentioned steps using a fluorescent X-ray analyzer (Rigaku RIX2100) is shown below. It was found that the composition was as follows in terms of oxide. The pulp was calcined at 1100 ° C. and measured from the weight loss. Serial Pulp: 51.4 wt%, SO _3: 0.5 wt% SiO _2: 24.2 wt%, P ₂ O _5: 0.2 wt% Al ₂ O _3: 14.0 wt%, Cl: 0 .2 wt% CaO: 8.0 wt%, ZnO: 0.1 wt% MgO: 1.4 wt%, others: traces TiO _2: 1.0 wt%,

As described above, in the first embodiment, the separated papermaking sludge is dewatered by the screw press 92 and the screen dewatering machine 96. Then, water is added to the dewatered papermaking sludge to adjust the concentration, and then papermaking is performed using a filter body. In other words, by dewatering the papermaking sludge separated at the papermaking plant, it is easy to transport the papermaking sludge to a treatment facility for papermaking sludge having a drainage body, and a cured product is manufactured from the papermaking sludge so that it is commercially profitable. be able to.

Next, a method and an apparatus for treating papermaking sludge according to a second embodiment of the present invention will be described with reference to FIGS.
This will be described with reference to FIG. In the first embodiment, the apparatus for producing a cured body is placed in a different place from the paper mill. For this reason, a solid content of 5 to 5 is set at a paper mill so that transport is easy.
0% block-shaped papermaking sludge 11B or mat-shaped or flaked papermaking sludge 11F was produced. On the other hand, in the second embodiment, an apparatus for manufacturing a cured body is disposed in a paper mill. For this reason, as shown in FIG.
The screw press 92 and the screen dewatering machine 96 for dewatering are omitted, and the papermaking sludge 8 settled in the sedimentation tank 86 is removed.
7 is directly attached to the hardened body manufacturing apparatus shown in FIG.
9.

FIG. 12 shows the configuration of the apparatus for manufacturing a cured body according to the second embodiment. The apparatus for producing a cured product includes a raw material adjusting mechanism 110 that adjusts papermaking sludge to produce a slurry 14, a papermaking mechanism 20 that produces a papermaking body 26 from the same slurry 14 as in the first embodiment, and an inverted papermaking body 26. A press unit 50 for laminating the papermaking body 26 and then pressurizing and dewatering the paperboard 26, and a dryer 60 for drying the pressed paperboard body to form the cured body 1.

The material adjusting mechanism 110 according to the second embodiment will be described with reference to FIG. Raw material adjustment mechanism 110
The concentration of the papermaking sludge 87 sent from the sedimentation tank 88 through the pipe 89 and the water 12 is adjusted to a solid content of 0.5 to 25 (preferably 3 to 6) wt% by suction dehydration described later. Into the mixer 13 and a coagulant (a floc) made of any one of aluminum sulfate, ferric chloride, polyaluminum chloride, sodium polyacrylate, polymethacrylate, polyacrylate, and polyacrylamide. Agent: added amount of 0.01 to 5%) and organic fibers such as vinylon fiber (binder: added amount of 0.1 to 10)
% By weight) and mixed in a mixer 13 to obtain a slurry 1
Adjust 4 As the organic fiber (binder), synthetic fibers such as polyethylene, polypropylene, and vinylon, pipes, pulp recovered from waste paper, and other fibrous industrial wastes can be used. As a raw material, various inorganic powders and resins can be further added to papermaking sludge.
Here, when the concentration of the papermaking sludge sent from the sedimentation tank 86 is low, it is not particularly necessary to add water. Further, papermaking sludge discharged in another step may be added to the sedimentation tank 86.

This slurry 14 was placed on the bottom of the filter 1
Suction dehydration is performed using the dehydration container 15 provided with 6.
By suction dehydration, the solid content is 0.5 to 25
(Preferably 3 to 6) by weight. In the suction dehydration, since the fibers of the papermaking sludge are not oriented, the resulting composite cured product is less likely to warp or crack.

The bottom of the dewatering vessel 15 is provided with a vacuum pump 17
And suction of water by the operation of the vacuum pump 17. The filter 16 is not particularly limited, but includes a sintered metal, a perforated metal plate (a metal plate having a hole having a diameter of 1 to 5 mm),
A porous ceramic filter, a porous resin, a glass fiber plate or the like can be used. The raw material 14 whose water content has been adjusted in the dehydration container 15 is temporarily stored in a chest tank 18.
The chest tank 18 is provided with a stirring propeller so that solids in the raw material do not settle.

The subsequent steps are the same as in the first embodiment described above with reference to FIG. In the second embodiment, the cooked paper is washed with water to precipitate papermaking sludge separated from pulp, and then a raw material solution containing the precipitated papermaking sludge is made using a filter body. That is, the papermaking sludge separated from the pulp is settled before papermaking, so that the concentration can be easily adjusted. In addition, since water is once dehydrated in the paper mill and the amount of dehydration corresponding to the dehydration is not performed in the apparatus for producing a cured product, energy equivalent to dehydration can be saved. For this reason, a cured product can be produced from papermaking sludge so that it is commercially profitable.

In the second embodiment, since the solid content is adjusted to 0.5 to 25 (preferably 3 to 6)% by weight in the dewatering vessel 15, the papermaking sludge separated from the pulp is efficiently formed. The cured product can be manufactured from papermaking sludge so as to be commercially viable.

Next, a method and an apparatus for treating papermaking sludge according to a third embodiment of the present invention will be described with reference to FIG. In the third embodiment, as in the second embodiment, an apparatus for manufacturing a cured body is disposed in a paper mill. However, in the third embodiment, the sedimentation tank 86 provided in the second embodiment is omitted, and the wastewater containing the papermaking sludge separated from the water washer 80 is hardened through the pipe 89 in the same manner as in the second embodiment. It is configured to be sent to a body manufacturing device. In the water washer 80, when pouring water into the waste paper digested by the digester 70, a waste liquid having a high papermaking sludge concentration at the start of pouring is sent to the hardening body manufacturing apparatus side, and a papermaking sludge concentration at the end of pouring is supplied. Waste liquid with low wastewater treatment, or
As in the second embodiment, it is preferable to send the cured product through a precipitation tank to a device for producing a cured product.

In the third embodiment, the digested paper is washed with water, the concentration of the papermaking sludge separated from the pulp is adjusted, and the raw material solution containing the adjusted papermaking sludge is made into a paper using a filter body. The papermaking sludge is adhered to the surface of the water body. That is, since the papermaking sludge separated from the pulp is once dehydrated in a papermaking factory, and the amount of water added corresponding to the dewatered amount is not performed in the hardened body manufacturing apparatus, energy corresponding to dewatering can be saved. No precipitation is performed. For this reason, a cured product can be produced from papermaking sludge so that it is commercially profitable.

In the third embodiment, since the solid content is adjusted to 0.5 to 25 (preferably 3 to 6)% by weight in the dewatering vessel 15, the papermaking sludge separated from the pulp is efficiently formed. The cured product can be manufactured from papermaking sludge so as to be commercially viable.

In the first embodiment, the specific gravity is 1.1.
6. In the second embodiment, 1.20. In the third embodiment,
It was 1.30. On the other hand, under the same conditions as in the embodiment,
When it was not digested, the specific gravity was 1.00. As described above, the inorganic components can be efficiently extracted by cooking.

Example 1 (1) 1000 parts by weight of high-quality waste paper for OA equipment, 200 parts of water
0 parts by weight and 100 parts by weight of sodium hydroxide were mixed, put into a digester (a spherical pot having a stirring blade inside), and turned into a liquid by rotating while blowing steam. (2) The liquid digest was placed on a 60-mesh screen, water was poured into the screen, and separated into pulp and wastewater containing paper sludge. (3) Next, the waste water was accumulated in the settling tank. 1: 1 papermaking sludge having the following composition discharged from kraft paper
And mixed. The composition in the solid component is as follows pulp: 76.0 wt% MgO: 0.1 wt% SiO _2: 6.0 wt% Al ₂ O _3: 13.5 wt% CaO: 2.6 wt% Others traces As a result of the addition and mixing, the following composition was obtained.

(4) The mixed papermaking sludge was subjected to screw pressing to form flakes, and then the vinylon fiber 0.1.
3% by weight and water are added so that the solid content becomes 5%.
The slurry was prepared.

(5) A paper was made using this slurry. The wire cylinder is # 60, the diameter is 70 cm, the width is 1 m, the number of rotations is 60 rotations / minute, the belt conveyance speed is 48 m / minute, and the making roll is 64 cm in diameter. The size of the press mold was 1800 mm × 1000 mm. Further, 45 push bars of 190 mm square were used.

The composition of the cured papermaking sludge obtained is shown below. The specific gravity was 1.16. Pulp: 51.2 wt% MgO: 1.4 wt% SiO _2: 24.2 wt% SO _3: 0.5 wt% Al ₂ O _3: 14.0 wt% P ₂ O _5: 0.2% by weight CaO: 8.0% by weight Cl: 0.2% by weight TiO _2: 1.0 wt% ZnO: 0.1 wt% Others traces

Example 2 As Example 1, except that the ratio of the amount of papermaking sludge discharged from kraft paper to the amount of papermaking sludge obtained by digestion was changed. That is, 1: 2
To increase the amount of sludge obtained by digestion. The composition of the cured paper sludge obtained is shown below. Pulp: 43.2 wt% MgO: 0.9 wt% SiO _2: 30.0 wt% SO _3: 0.5 wt% Al ₂ O _3: 14.3 wt% P ₂ O _5: 0.1% by weight CaO: 9.8% by weight Cl: 0.1% by weight TiO _2: 0.7 wt% ZnO: 0.1 wt% Others traces further adjusted to a concentration of 5% dehydrated with a dehydrating container as shown in FIG. 13 did. The specific gravity was 1.20.

Example 3 Papermaking was performed using papermaking sludge obtained by digestion. The composition of the cured paper sludge obtained is shown below. The specific gravity was 1.3. Pulp: 26.8 wt% MgO: 1.0 wt% SiO _2: 42.4 wt% SO _3: 0.1 wt% Al ₂ O _3: 15.0 wt% P ₂ O _5: 0.1% by weight CaO: 13.4 wt% Cl: 0.1% by weight TiO _2: 1.0 wt% ZnO: 0.05 wt% Others traces

Example 4 3020 parts by weight of unfired papermaking sludge (papermaking sludge of Mino Paper Co., Ltd. handled by Maruto Kiln Co., Ltd .: solid content 34% by weight, water content 66% by weight) were prepared. Next, acid washing is performed using a 2N hydrochloric acid aqueous solution,
The component a was almost completely removed, and this was designated as A.

[0110] A pulp: 51.2 wt% MgO: 1.6 wt% SiO _2: 18.6 wt% SO _3: 3.5 wt% Al ₂ O _3: 22.3 wt% P ₂ O _5: 0 .3 wt% CaO: 0.0 wt% Cl: 0.1% by weight SO _3: 1.2 wt% ZnO: 0.1 wt% Others traces

In addition, high quality paper for OA equipment was digested and washed in the same manner as in the example to obtain papermaking sludge. B Pulp: 21.8 wt% SiO _2: 4.6 wt% Al ₂ O _3: 7.5 wt% P ₂ O _5: 0.1 wt% CaO: 65.0 wt% Na ₂ O: 0.1 % By weight SO ₃ : 0.2% by weight Other trace amount The amount of calcium carbonate was 55% by weight.

In addition, papermaking sludge of ink-jet printer paper of Maki Paper Co., Ltd., handled by Maruto Kiln Co., Ltd .: 51% by weight of solid content, 49% by weight of water, and 10% by weight of calcium carbonate (cubic shape) are added. And

C pulp: 16.4% by weight SiO ₂ : 2.6% by weight Al ₂ O ₃ : 5.5% by weight P ₂ O ₅ : 0.1% by weight CaO: 75.0% by weight Na ₂ O: 0.1% by weight SO ₃ : 0.2% by weight Other trace amount The amount of calcium carbonate was 65% by weight.

Samples were prepared by appropriately mixing A, B, and C as described above, and were prepared by the apparatus shown in FIG. Wire cylinder
60, diameter 70cm, width 1m, rotation speed 60 rotations / min, belt conveyance speed 48m / min, making roll 64cm in diameter
It is. The solid content of the raw material is 5%. The size of the press mold was 1800 mm × 1000 mm.
Further, 45 push bars of 190 mm square were used.

[0115] The results of measuring the bending strength, compressive strength, nailing properties, lightness, and fracture toughness of a cured product were shown in Figs.
8 is shown in the graph. FIG. 15 shows the relationship between CaO / SiO ₂ and the compressive strength and lightness, with the vertical axis representing the compressive strength (Kg / cm ² ).
In addition, the ratio of CaO / SiO ₂ is plotted on the horizontal axis with the brightness (N). FIG. 16 shows the relationship between CaO / Al ₂ O ₃ and the compressive strength and lightness. The vertical axis indicates the compressive strength (Kg / cm ² ) and the lightness (N), and the horizontal axis indicates the ratio of CaO / Al ₂ O _3. It is.
FIG. 17 shows the relationship between the CaO content and the bending strength / compression strength, with the ordinate representing the bending strength / compression strength (Kg / cm ² ) and the abscissa representing the CaO content (%). FIG.
The relationship between the O content and the nail pull-out strength and fracture toughness is shown. The vertical axis represents the nail pull-out strength (Kg / cm ² ) and the fracture toughness (MPa · m ^1/2 ), and the horizontal axis represents the CaO content (%). ) Has been taken.

The fracture toughness peaks at 3 to 6% by weight in terms of CaO. In addition, the pull-out strength of the nail is based on 20 kg / cm ^2, but it is 4 to 6 in terms of CaO.
It will be in the range of 3% by weight. The same tendency also appears in bending strength and compressive strength. Further, the ratio of CaO / SiO ₂ is 0.2 to 7.9, and the ratio of CaO / Al ₂ O ₃ is 0.4.
By adjusting from 2 to 12.5, the compressive strength and the brightness N4.0 or more can be achieved.

Since used paper is used, the color of the ink remains and the ink becomes blackish. In the press method, the color becomes N3.0 to 3.5, but in the present papermaking method, it becomes N4.0 or more.

(Comparative Example 1) As in Example 1, but the used paper was not digested, but the waste liquid obtained by crushing and washing the used paper was mixed with the papermaking sludge of kraft pulp having a high fiber content. Even after papermaking, the inorganic component was small, and the specific gravity was 0.8 with the following composition. Pulp: 74.0 wt% MgO: 0.1 wt% SiO _2: 8.0 wt% Al ₂ O _3: 13.5 wt% CaO: 2.7 wt% Others traces

Comparative Example 2 A cured product was obtained in the same manner as in Comparative Example 1 but by pressing instead of papermaking. The specific gravity of the following composition was 1.0. Pulp: 74.0 wt% MgO: 0.1 wt% SiO _2: 9.0 wt% Al ₂ O _3: 14.0 wt% CaO: 2.8 wt% Others traces

(Comparative Test Example 3) Sol-gel method No Ca-based crystals A mixture of ethyl alcohol and waste paper was mixed with a ball mill to form a mixture.
Crush for hours. Then, tetraethoxysilicate 40
Parts by weight, 30 parts by weight of tripropoxyaluminate, 30 parts by weight of calcium dimethoxide, 66 parts of ethyl alcohol
1 part by weight of water, 18 parts by weight of water and 1 part by weight of 0.1 N hydrochloric acid were added to obtain a sol solution. The pulverized material and the sol solution were mixed, poured into a mold, dried at 100 ° C. for 24 hours, further impregnated with a phenol resin, and cured at 60 ° C. When this cured product was examined by X-ray powder diffraction, no Ca-based crystal was present. It seems that calcium carbonate in the used paper was dissolved by hydrochloric acid. The average specific gravity is 0.98, the maximum specific gravity is 1.09, the minimum specific gravity is 0.90, and the variation is 11.2%.

Further, the dimensional change rate of each of Examples 1, 2, and 3, and Comparative Examples 1, 2, and 3 was measured when immersed in water for 24 hours. The results are shown.
In addition, the brightness is also described. Furthermore, 2000 which represents sound insulation properties
The transmission loss (db) in Hz (thickness 2 mm) was measured. Dimensional change XY Dimensional change Z Lightness Transmission loss Example 1 3% 20% N4.5 55 Example 2 2% 15% N5.0 55 Example 3 1% 11% N5.0 60 Comparative example 1 15% 40 % N3.5 40 Comparative Example 2 16% 38% N3.5 35 Comparative Example 3 20% 40% N3.0 30

As described above, by digestion, inorganic components can be removed from waste paper, and a high-density composite cured product can be obtained. In addition, since the fibers can be uniformly entangled by digestion, the dimensional stability during moisture absorption is also excellent.

[0123]

As described above, according to the present invention, the dimensional change is small, the density is high, and the transmission loss is high.
Hard to change dimensions. It is particularly effective in building material applications such as soundproofing, vibration damping materials, floor boards, ceiling boards, and wall materials, and is suitable as a building material.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view of a composite cured product of the present invention.

FIG. 2 is a schematic cross-sectional view of the composite cured product of the present invention.

FIG. 3 is a conceptual diagram of a paper mill according to the first embodiment of the present invention.

FIG. 4 is a conceptual diagram of an apparatus for manufacturing a cured body according to the first embodiment of the present invention.

FIG. 5 is a conceptual diagram of a raw material adjusting mechanism of the apparatus for manufacturing a cured body shown in FIG.

6 is a conceptual diagram of a papermaking mechanism of the apparatus for manufacturing a cured body shown in FIG.

FIGS. 7A, 7B, and 7C are explanatory views of the operation of the cutting rotary drum.

FIGS. 8A, 8B, and 8C are explanatory diagrams of the operation of the reversing device.

FIGS. 9A, 9B, and 9C are explanatory diagrams of the operation of the press machine.

FIGS. 10A, 10B, and 10C are explanatory diagrams of the operation of the press machine.

FIG. 11 is a conceptual diagram of a paper mill according to a second embodiment of the present invention.

FIG. 12 is a conceptual diagram of an apparatus for manufacturing a cured body according to a second embodiment of the present invention.

13 is a conceptual diagram of a raw material adjusting mechanism of the apparatus for manufacturing a cured body shown in FIG.

FIG. 14 is a conceptual diagram of a paper mill according to a third embodiment of the present invention.

FIG. 15 is a graph showing a relationship between CaO / SiO ₂ and compressive strength and brightness.

FIG. 16 is a graph showing the relationship between CaO / Al ₂ O ₃ , compressive strength, and brightness.

FIG. 17 is a graph showing the relationship between CaO content and bending strength / compression strength.

FIG. 18 is a graph showing the relationship between the CaO content, nail pull-out strength, and fracture toughness.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Composite hardened body 2 Amorphous body 3 Fibrous material 4 Inorganic powder 5 Core material 6 Reinforcement layer 10 Raw material adjustment mechanism 11B Block-shaped papermaking sludge 11F Flake-shaped papermaking sludge 14 Raw material solution (slurry) 15 Dehydration container 16 Filter 17 Vacuum pump Reference Signs List 18 chest tank 20 papermaking mechanism 21A, 21B, 21C butt 22A, 22B, 22C wire cylinder 23 transport belt 24 suction box 26 papermaking body 30 rotating drum 31 piano wire 32 storage groove 33 receiving groove 36 cutter 38 belt conveyor 40 reversing device 42 conveying device 44 table 46 reversing plate 50 press machine 52 male type 52a through hole 54 female type 54A concave portion 54a through hole 56 curtain coater 60 dryer 70 digester 80 water washer 87 sedimentation tank 92 screw press 96 screen Dewatering machine

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) D21C 5/02 ZAB D21C 5/02 ZAB D21J 1/18 D21J 1/18 (72) Inventor Tetsuji Ogawa Gifu 2-1-1 Kanda-cho, Ogaki-shi Ibiden Co., Ltd. (72) Inventor Toshihiro Nomura 2-1-1 Kanda-cho, Ogaki-shi, Gifu F-term (reference) 4D059 AA30 BB02 BD11 BD18 BE14 BE17 BE55 BE56 BJ01 BK08 BK11 BK12 CB04 CC04 DA03 DA04 DA12 DA15 DA16 DA24 DA70 DB02 DB08 DB11 DB31 DB34 EB01 EB11 4L055 AC09 AF21 AG16 BA18 BF01

Claims (9)

[Claims] 1. A method for treating papermaking sludge, comprising at least the following steps: (a) a step of cooking paper; (b) a step of separating papermaking sludge from the cooked cooked product; (c) A step of drying and curing papermaking sludge to obtain a cured product. 2. A method of treating papermaking sludge, comprising at least the following steps: (a) a step of cooking paper; and (b) a step of washing the cooked digest and washing it to separate papermaking sludge. (C) papermaking a raw material solution containing papermaking sludge using a filter body, attaching the papermaking sludge paperwork to the surface of the filter body, and transferring the papermaking body to a conveyor belt; (d) papermaking body Curing the paper to obtain a cured papermaking sludge. 3. A method for treating papermaking sludge, comprising at least the following steps: (a) a step of cooking paper; and (b) a step of washing the cooked pulverized product with water to separate papermaking sludge. (C) a step of dewatering the separated papermaking sludge; (d) a step of adding water to the dewatered papermaking sludge to adjust the concentration; (e) making a raw material solution containing the papermaking sludge whose concentration has been adjusted using a drainage body. A step of attaching a papermaking sludge paperwork to the surface of the filter body and transferring the papermaking body to a conveyor belt; and (f) curing the paperwork to obtain a hardened papermaking sludge. 4. The solid content of the dehydration in the step (c) is reduced to 5 to 5%.
4. The method for treating papermaking sludge according to claim 3, wherein the amount is set to 0%. 5. A method for treating papermaking sludge, comprising at least the following steps: (a) a step of cooking paper; and (b) a step of washing the cooked cooked product with water to separate papermaking sludge. (C) a step of precipitating the separated papermaking sludge; (d) papermaking the raw material solution containing the precipitated papermaking sludge using a filter body, and attaching a papermaking sludge paperwork to the surface of the filter body; (E) curing the papermaking body to obtain a hardened papermaking sludge; 6. A method for treating papermaking sludge, comprising at least the following steps: (a) a step of cooking paper; and (b) a step of washing the cooked cooked product with water to separate papermaking sludge. (C) a step of adjusting the concentration of the separated papermaking sludge; (d) papermaking a raw material solution containing the papermaking sludge whose concentration has been adjusted using a filter body, and attaching the papermaking sludge paperwork to the surface of the filter body; Transferring the paper to a conveyor belt; and (e) curing the paper to obtain a hardened papermaking sludge. 7. In the concentration adjustment in (c), the solid content is reduced to 3%.
The method for treating papermaking sludge according to claim 6, wherein the content is set to 6%. 8. A paper sludge processing apparatus comprising at least the following: (a) a digester for digesting paper; (b) a washing apparatus for washing the digested cooked product with water to separate papermaking sludge; (C) A curing device for drying and curing paper sludge. 9. An apparatus for treating paper sludge, comprising at least the following: (a) a digester for cooking paper; (b) a washing apparatus for washing the cooked cooked product with water and separating papermaking sludge. (C) a filter body for papermaking a raw material solution containing papermaking sludge and attaching a papermaking sludge paperwork to the surface; (d) a transfer belt for transferring the paperwork on the surface of the filter body; (e) a transfer belt. A cutting device for cutting the filtered water body; (f) a curing device for hardening the cut filtered water body.