JP2002292359A - Method for reutilizing mineralized organic waste and artificial zeolite - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for reutilizing mineralized organic wastes and an artificial zeolite which produce an environment-friendly material excellent in flame retardancy and sound-insulating properties, and capable of adsorbing harmful gases and controlling humidity. SOLUTION: A starting material for flame-retardant building materials and packing materials is produced by utilizing a carbide CP obtained by mineralizing organic wastes by carbonizing and dry-distilling it in a carbonizer kept in a reducing atmosphere in the presence of and an artificial zeolite ZP obtained by homogenizing coal fly ash and an aqueous alkali solution by agitation and mixing and subjecting the obtained slurry to a hydrothermal reaction by heating at about 100 deg.C.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for recycling inorganic wastes and artificial zeolites for manufacturing materials such as building materials and packing materials by utilizing wastes.

[0002]

2. Description of the Related Art The "Basic Law for the Promotion of the Creation of a Recycling-Oriented Society" has recently been enacted, including the enactment of the Food Recycling Law and the revision of the Waste Management Law. The increase in waste due to the waste system has tightened the residual capacity of the final disposal site, and as a countermeasure, the reduction of waste generation, the efficient use of resources through recycling and proper disposal of waste We will take measures.

[0003] Most of the household wastes such as general wastes and various sludges, and the wastes from food-related businesses, which are covered by the present invention, are incinerated at facilities of local governments and private companies. The part is only composted, agricultural waste such as unused fruits and vegetables, rice straw, straw, rice paddy, and forest waste such as thinned wood, bark, sawdust, or
Livestock excrement such as livestock manure and bedding is partially composted and bred, but most of it is incinerated in facilities of private companies or dumped and landfilled as industrial waste.

[0004] In addition, coal fly ash discharged from coal-fired power plants and the like is partially used as a cement admixture or a roadbed material, but is mostly dumped as industrial waste at a final disposal site. .

[0005] Incineration of the various combustible wastes described above in a small and incomplete facility leads to air pollution and pollution of dioxins, and landfilling results in a shortage of landfill volume at the final disposal site. In addition, hazardous substances contained cause soil pollution and raw water pollution due to leaching into groundwater, all of which have caused major social problems.

In the case of composting, the pretreatment such as solid-liquid separation and moisture control is required, and the demand period is limited although the production requires a long period of time. It has been repelled by the local residents due to bad smell and wastewater generated inside and during storage, and both are far from sanitary reuse.

On the other hand, as an example of a method for effectively utilizing these organic wastes, a method for producing a “fire-resistant board composition” disclosed in Japanese Patent Application Laid-Open No. 9-95556 has been proposed.

FIG. 4 shows the manufacturing process.
First, the paper or wood waste material (A) is roughly ground with a crusher, then loosened into a fiber with a planer, crushed and separated by a crusher, and the plastic waste material (B) is similarly crushed and separated by a crusher / pulverizer.

A refractory additive (C) is added at a required blending ratio to both of the raw materials (A) and (B) weighed by a required amount, and then mixed and stirred by a mixing fiber opening machine and put into a hot press.

In the hot press, the moisture contained in the paper or wood waste material (A) evaporates, and the plastic (B) melts into a fluid state, and is mixed with the raw material (A) that is uniformly mixed. The preparation of the three components is completed by covering the surfaces of the particles of the refractory additive (C), and after applying pressure in this state, the product is cooled and finished.

[0011]

The above-mentioned fire-resistant board makes it possible to effectively use a large amount of discarded paper or wood waste and plastic waste, and has a flame retardant grade of 1st, but has a slight strength. In addition, it is necessary to treat harmful gas released from waste plastics during the manufacturing process.Because melting of plastic eliminates voids in the board structure, harmful gases such as environmental hormones in the building used are reduced. There is a drawback that it lacks in adsorptivity and ability to control moisture.

In addition, gypsum board, which has been generally used as a flame retardant board because of its low cost, has been found to be polluted because its waste generates hydrogen sulfide gas and the like due to microbial decomposition at the final disposal site. In the future, alternatives that solve these problems will be demanded.

[0013]

According to the first aspect of the present invention, there is provided a method for recycling mineralized organic waste and artificial zeolite, the method comprising the steps of: providing household waste, food industry waste, agricultural / forestry waste and livestock excretion; The carbonized material, such as organic waste, is carbonized by carbonization and carbonization in a carbonization facility that maintains a reducing atmosphere at the steam location, and the coal fly ash and the aqueous alkali solution are stirred.
The mixed and homogenized slurry is heated to about 100 ° C and subjected to a hydrothermal reaction, utilizing an artificial zeolite in which the element substances are combined with each other. It is characterized by producing materials such as packing materials.

[0014]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block flow diagram showing a schematic process of a method for recycling mineralized organic waste and artificial zeolite according to the present invention, and FIG. 2 shows an example of a schematic structure of a carbonization furnace. FIG. 3 is a sectional view showing an example of a schematic structure of the homogenizing device.

In FIG. 1, reference numeral 1 denotes a pretreatment step for solid waste HR from which packaging or packing has been removed by some means, and a receiving hopper 11 and a guillotine-type shearing machine for coarsely crushing the solid waste HR. And a crushing means 12 using a twin-screw crusher and a crushed material transfer means 13 for transferring the crushed material to a solid-liquid mixing means 31 in the next step.

The pretreatment step 2 for the liquid waste LR includes a storage tank 21 having a stirring means and a solid-liquid mixing means 31 as described above.
And a liquid transfer means 22 connected to the liquid transfer means.

The mixture pretreatment step 3 comprises the above-mentioned solid-liquid mixing means 31, drying means 32 and pulverizing means 33, and is connected to a carbonizing furnace 4 shown in FIG.

Next, the processing step 5 of the coal fly ash FA includes a fly ash hopper 51 provided with a discharging means, a slurry hopper 52 provided with a mixing means, a caustic soda storage tank 53 provided with a caustic soda pump, And a homogenizing device 54 shown in FIG. 3 for equalizing the particle diameter.

The fly ash post-treatment step 6 includes a reaction accelerating device 61 for irradiating a vibration factor such as an ultrasonic wave, a heating reactor 62 which is a reaction tank having a heating means, and a sedimentation / water washing means 6.
3 and a dehydrating means 64.

A common heat source SB for supplying steam or a heat medium to the drying means 32 and the heating reactor 62 described above.
Is installed separately.

As shown in FIG. 2, the carbonization furnace 4 is an external heat kiln having a fixed body and a built-in screw conveyor or a rotary kiln in which only the body is rotated (hereinafter, both are abbreviated as kilns). 41, a heating unit 42 surrounding the body for indirectly heating the contents of the kiln from the outside, and a lower part of the heating unit 42 connected via a connecting portion 43 to generate heat inside the kiln 41. The dry distillation gas DG of the fine particles OR of the organic waste to be treated and the above-described pretreatment steps 1, 2,
The deodorizing section 44 which heats the odor BG generated in 3 and the like and decomposes the odor by heating is mainly constituted.

The kiln 41 has a feeder 41a for feeding fine granules OR at the front and a discharger 41 having a cooling mechanism for discharging the carbide CP generated in the kiln 41 at the rear.
b and a variable speed kiln drive mechanism 41c for driving the kiln movable section are attached.

A heating and drying burner 42a is provided on a side wall of the heating section 42, an air-cooling blower 43a is provided on the connecting section 43, and a deodorizing burner 44a is provided on a side wall of the deodorizing section 44.

Further, the inlet hood 41d of the kiln 41 and the inlet 44b of the deodorizing section 44 are connected to form the above-mentioned dry distillation gas DG.
A push blower 45 is attached to a pipe for sending the odor, and an odor blower 46 is attached to a pipe for sending the odor BG to the outlet of the deodorizing burner.

Further, as shown in FIG.
Pump mechanism 5 installed at the front stage and capable of adjusting supply at high pressure
4a, an apparatus front portion 54b which is an introduction / compression portion, and an inflation / compression portion.
A replaceable stenosis body 54e, which is mainly composed of a device rear portion 54c, which is a mixing portion, and has a throttle portion held by a holding member 54d is fitted into an intermediate portion where the device front portion 54b and the device rear portion 54c are in contact. At the same time, a cylinder 54f that can move back and forth to adjust the mixing space G is provided on a rear portion of the stenosis body 54e with a drive mechanism (not shown), and a discharge portion 54g is provided in a part of the device rear portion 54c. Is provided.

Next, referring to FIG. 1, mainly referring to FIG. 1, a method of recycling a waste carried out by the thus configured “recycling apparatus using mineralized organic waste and artificial zeolite” will be described. 4 and the homogenizing device 54 will be described with reference to FIGS.

The solid waste HR mainly composed of solids among the various wastes carried into the facility is thrown into the receiving hopper 11, temporarily stored, and then crushed into large-scale waste such as forestry waste. After being roughly crushed to an appropriate size by the means 12, it is transferred to the solid-liquid mixing means 31 by the crushed material transfer means 13 together with other solid waste that does not need to be applied to the crushing means 12.

The liquid waste LR having a large amount of water such as livestock manure and various sludges is put into a storage tank 21 and temporarily stored therein.
Is transferred to the solid-liquid mixing means 31.

The two raw materials which have been sent to and mixed with the solid-liquid mixing means 31 have a large amount of water, generally about 70 to 95%. After being dried to a degree, the fine particles OR are finely pulverized to about 1 cm ³ or less in the pulverizing means 33, and are sent into the kiln 41 by the charging device 41a.

On the other hand, as shown in FIG.
The odor BG generated from 2, 3 and the like is sucked by the odor blower 46, and the dry distillation gas DG generated by the dry distillation in the kiln 41 described later is sucked by the pushing blower 45 and sent into the deodorizing section 44, respectively. The deodorizing section outlet temperature controller 47
Is heated to 850 to 950 ° C., which is the temperature required for odor decomposition by the deodorizing burner 44a controlled by the above method.

High-temperature gas H deodorized by this high-temperature combustion
G is sent to the heating section 42 via the connecting section 43 and indirectly heats the body of the kiln 41 from outside while staying for 2 seconds or more. The heating temperature is supplied by the kiln temperature controller 48. Machine 41a, the speed of the kiln drive mechanism 41c, the temperature of the heating and drying burner 42a, or the air-cooling blower 43a
Is controlled by controlling the amount of cooling air and the like.
It is kept at 0 ° C (preferably 500-600 ° C).

By this dry distillation operation, the supplied fine granules OR
Is carbonized and cooled by the discharger 41b to be discharged as a carbonized product CP, and the generated carbonized gas DG is sucked from the inlet hood 41d into the pushing blower 45, and is thermally decomposed in the deodorizing section 44 as described above. (See FIG. 2).

Usually, the functional groups described below, which are deodorizing groups which are decomposed and volatilized when carbonized at a relatively high temperature, become carbides when treated at a relatively low temperature of 600 ° C. or lower. Will remain on the surface.

The functional group is an acidic compound composed of oxygen and hydrogen and has a deodorizing ability to adsorb basic substances such as ammonia, formaldehyde and amino acids.

Next, the coal fly ash FA quantitatively supplied from the fly ash hopper 51 to the slurry hopper 52 becomes a mixed slurry S ₁ which is stirred and mixed with an appropriate concentration of caustic soda CS sent from the caustic soda storage tank 53. It is sent to the homogenizer 54.

In the homogenizing device 54 shown in FIG. 3, the mixed slurry S _{1, which} is intermittently press-fitted by an appropriate amount by the pump mechanism 54 a, collides with the front surface of the stenosis body 54 e and the restricting portion, and receives a shock reflected wave. There occurs, causes collapsing bubbles contained in the mixed slurry S _1, is adiabatically compressed by passing through the constricted body 54e, the fines coal fly ash FA is atomized, located further to the front cylinder 54f The slurry S is discharged to the mixing space G and adiabatically expanded to form the slurry S.
Synergistic actions such as shearing, collision, and cavitation are instantaneously generated between the _one molecule, and the supplied slurry S ₁ is sent to the next-stage reaction accelerating device 61 as a further homogenized slurry S ₂ .

In the reaction accelerating device 61, the supplied slurry S ₂ is irradiated with a vibration factor such as an ultrasonic wave to generate vibration in the slurry S ₂ , thereby forming the gelled Si.
(Silicon) and ions, A1 (aluminum) is accelerated elution of ions is sent to a heating reactor 62 becomes slurry S ₃ where the reaction rate is faster with alkali.

The slurry S ₃ sent to the heating reactor 62
Is heated to about 100 ° C. by the heat supplied from the heat source SB and is stored and stirred for 4 to 8 hours. The pretreatment described above makes the fly ash FA fine and homogenized, and the elution rate of each ion. Is faster, the elementary materials Si (silicas), A1 (aluminas), NaOH [sodium hydroxide (alkali)] and water are easily bonded by a hydrothermal reaction.

The slurry S _{4 that} has completed the binding reaction is separated into unreacted caustic soda CS adhering in the precipitation / washing means 63 and then sent to the dehydrating means 64 to be dehydrated. A non-combustible zeolite product ZP having the following formula:

Subsequently, the above-mentioned carbonized product CP and the above-mentioned zeolite product ZP are cut out in necessary amounts according to their uses and carried into a stirrer 71, and a suitable amount of a binder 72 of isocyanate type, phenol or epoxy resin is mixed. -After stirring, the final product FP can be manufactured by press molding.

[0042]

As described above, when a zeolite product is mixed with a carbonized product and used, the heat insulating property is improved by mixing the non-combustible zeolite, and in addition to the mutual voids held by the carbide particles, the inside of the zeolite is reduced. The adsorbing power and sound insulation of the pores are dramatically increased, and the fact that carbide is a material makes it easy to process, and when used for building material boards, it has flame retardancy, sound insulation and workability. In addition to being excellent in odor, it is also effective in adsorbing harmful gases such as formaldehyde generated from interior materials and controlling indoor humidity during dry and wet seasons.

Further, if it is used as a packing material, for example, for the core of cardboard, ethylene gas used for forcing fruits and vegetables is adsorbed, which is effective for maintaining the freshness of fruits and vegetables.

[Brief description of the drawings]

FIG. 1 is a block flow diagram showing schematic steps of a method for recycling mineralized organic waste and artificial zeolite according to the present invention.

FIG. 2 is a sectional view showing an example of a schematic structure of a carbonization furnace.

FIG. 3 is a sectional view showing an example of a schematic structure of a homogenizing device.

FIG. 4 is a block flow diagram showing an example of a conventional method for effectively using organic waste.

[Explanation of symbols]

 4 Carbonization furnace 54 Homogenizer FA Coal fly ash HR Solid waste LR Liquid waste

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B01J 20/18 C01B 39/02 20/30 C02F 11/10 Z C01B 39/02 C07D 319/24 C02F 11 / 10 B09B 3/00 ZAB C07D 319/24 304G F term (reference) 4D004 AA01 AA02 AA04 AA37 BA10 CA03 CA04 CA12 CA13 CA15 CA24 CA26 CA32 CA34 CA40 CA42 CA43 CA48 CB09 CB12 CB13 CB15 CB31 CB34 CB42 CB42 CB42 CB42 CB42 CB42 CB42 CB42 CB42 CB42 CB42 CB42 CB42 CB42 CB42 CB42 CB42 CB42 CB42 CB37 CB42 CB42 CB42 CB42 BJ00 BK08 BK11 CA16 CB01 CB06 CC04 CC06 DA01 4G066 AA13D AA61B AA78A AC22D AC39A AE20B AE20C BA22 CA29 CA52 CA54 DA03 EA09 FA03 FA05 FA14 FA21 FA28 FA31 FA34 4G073 BD15 CZ01 FB04 FB18 FB04 FB03 FB18 FB04 FB18 FB04

Claims (1)

[Claims] (1) Mineralization of organic waste such as domestic waste, food industry waste, agricultural / forestry waste and livestock excrement by carbonization and carbonization in a carbonization facility that maintains a reducing atmosphere at a steam location. Using an artificial zeolite that combines elemental substances by heating and heating the slurry homogenized by stirring and mixing coal fly ash and an aqueous alkali solution to about 100 ° C. and causing a hydrothermal reaction. A method for recycling organic mineral waste and artificial zeolite, which is characterized by producing materials such as building materials and packing materials that are flammable and excellent in gas adsorption.