JP3340290B2 - Incineration method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention makes it possible to completely burn incinerated materials containing synthetic resins and to reduce the concentration of carbon monoxide gas, the concentration of nitrogen oxides and the amount of unburned carbon generated during combustion. Incineration methods that are possible.

[0002]

2. Description of the Related Art In recent years, new products have overflowed and rich material culture has been formed due to changes in lifestyles, improvement in living standards and income levels, but industrial waste and garbage discharged from factories and households accompanying this. As the amount of wastewater is rapidly increasing, the problems associated with these treatments have become major social problems.

[0003] In particular, synthetic resins have excellent mechanical properties.
Due to their physical properties and formability, enormous amounts are used in every field as materials that are indispensable in modern society, and the total amount of waste is also in excess of several million tons per year. Therefore, treatment of synthetic resin waste has become a particularly important issue among industrial waste and waste disposal. In addition, since many synthetic resins are manufactured using petroleum as a raw material, there is a strong demand for recycling synthetic resin waste and effectively using it as an energy source.

[0004] As for the incineration of combustible waste containing synthetic resin, conventionally, air pollution due to carbon monoxide and nitrogen oxides generated during combustion, landfills that dispose of a large amount of residual ash and unburned residues after incineration, etc. In addition to problems such as shortage of waste, leakage of harmful components in residual ash at landfill sites, and the generation of toxic dioxins, when combustible garbage contains a large amount of synthetic resin waste with high combustion calories, However, there is a problem that the incinerator is easily damaged due to an increase in the temperature inside the incinerator.

[0005] As a method for solving such a problem, for example, a method in which combustion is performed under a low oxygen concentration to suppress the amount of nitrogen oxides, and a method in which the inside of a furnace is controlled to a certain temperature or less by performing combustion while spraying water. Methods for preventing damage to incinerators, methods for insolubilizing residual ash containing harmful substances, solidifying cement, and then landfill disposal have been proposed. Furthermore, regarding plastic garbage bags that are incinerated together with combustible garbage, recently, instead of conventional garbage bags, translucent garbage bags containing a large amount of calcium carbonate in polyethylene have been obliged to reduce garbage. Local governments are also trying to reduce the calories burned.

[0006]

Conventionally, synthetic resin waste is conventionally disposed of in landfills rather than incinerated for the reasons described above. Since it is manufactured as a raw material, there is a strong demand from various fields to incinerate it after use and to effectively use the heat generated during incineration as an energy source. Therefore, in incineration of incinerated materials including synthetic resin waste, technology to reduce the amount of carbon monoxide and nitrogen oxides generated during combustion, prevent damage to incinerators, and minimize the amount of unburned and residual ash Is most needed for the time being, but it cannot be said that the above known method sufficiently satisfies these requirements.

That is, incineration under low temperature and low oxygen concentration conditions is effective for suppressing the amount of nitrogen oxides generated during combustion and preventing damage to the incinerator, but reduces the combustion speed and the residue after incineration due to incomplete combustion. There was a problem that ash and unburned residue further increased. In addition, translucent garbage bags containing a large amount of calcium carbonate in polyethylene resin have a problem that the temperature rise in the incinerator during incineration is small, but the amount of residual ash after incineration increases by an amount equivalent to calcium carbonate. there were.

Accordingly, the present invention is capable of maintaining a burning rate even under low temperature and low oxygen concentration conditions when incinerating an incinerated material including a synthetic resin waste, and furthermore, it is possible to generate one during combustion. It is a technical object to provide an incineration method capable of suppressing the amounts of carbon oxides and nitrogen oxides and reducing the residual ash and harmful substances after incineration as much as possible.

[0009]

The technical problem can be solved by the present invention as described below. That is, the present invention relates to a method of burning an incinerated object containing a synthetic resin in an incinerator, wherein the incinerated object 10 burned in a unit time in the incinerator is provided.
0 weight parts, the total sulfur content is 0.8 wt% or less, the total sodium content is 0.5 wt% or less, and the total amount of the total sulfur content and the total sodium content is 1.0 wt% or less. An incineration method characterized in that diiron particles or iron oxide particles or a mixture of the particles coexist in a combustion furnace at a rate of 0.1 to 25 parts by weight per unit time and burn.
An incineration method characterized in that the ferric oxide-containing particles or the iron oxide particles or a mixture of the particles is put into an incinerator in a mode consisting of at least one of a synthetic resin composition, a powder, and a slurry and burned. . As hydrous ferric oxide particles
Incineration method characterized by using spindle-shaped goethite particles having a total sulfur content of 0.2 wt% or less and a total sodium content of 0.5 wt% or less. The iron oxide particles have a total sulfur content of 0.8 wt% or less and a total sodium content of 0.1 wt%.
An incineration method characterized by using granular magnetite particles having a total amount of 5 wt% or less and a total amount of sulfur and a total amount of 1.0 wt% or less.

[0010] That is, when burning the incinerated material containing a synthetic resin, the total amount of sulfur and / or the total amount of sodium as impurities is not more than a certain amount. By coexisting in the incinerator, the combustion catalyst function of the ferric oxide particles or iron oxide particles can be effectively exhibited, so that combustible waste and synthetic resin can be completely burned in the incinerator As a result, it has been found that it is possible to reduce the residual ash and unburned residue and to suppress the amounts of carbon monoxide and nitrogen oxide in the exhaust gas, and have reached the present invention.

Next, various conditions for implementing the present invention will be described. In the present invention, the total sulfur content is 0.8 wt%
And the total sodium content is 0.5 wt% or less,
It is necessary to use ferric hydroxide particles and / or iron oxide particles in which the total amount of total sulfur and total sodium is 1.0 wt% or less. The hydrous ferric oxide particles or iron oxide particles generally contain a large amount of impurities such as sulfur derived from iron sulfate as an iron raw material and sodium derived from sodium hydroxide as an alkaline aqueous solution raw material. For use in the application of the present invention, impurities are contained in the case of hydrous ferric oxide particles by washing with water, and in the case of iron oxide particles by solubilization of impurities and re-washing in the manufacturing and heat treatment stages of the production stage. Although it is necessary to reduce it, the lower limit of the total amount of sulfur and the total amount of sodium are 0.005 wt%, respectively, due to economic and technical restrictions. When the amount of the impurities is large, the combustion catalytic activity of the ferric oxide-containing particles and / or the iron oxide particles becomes small, and the effect of imparting the combustion characteristics aimed at by the present invention is unfavorably small. This means that the total amount of sulfur and the total amount of sodium among the impurities of the ferric oxide-containing particles and / or the iron oxide particles depend on the area of the contact interface between the particles and the synthetic resin and the magnitude of the combustion catalytic activity per unit area. It is presumed that this is due to an important factor that influences. The total sulfur amount is a value measured by a carbon-sulfur analyzer EMIA-2200 manufactured by Horiba, Ltd. The total sodium amount is an inductively coupled plasma atomic emission spectrophotometer SPS manufactured by Seiko Electronic Industry Co., Ltd. It is a value measured with -4000 type.

Further, in the present invention, the particle size distribution of the hydrous ferric oxide particles and / or iron oxide particles is preferably 60% or less. This particle size distribution affects the flammability through the packing structure of particles dispersed in the resin when kneaded into the above-described synthetic resin. The particle size distribution referred to here is a photograph obtained by magnifying a 10,000-fold photograph obtained by a transmission electron microscope four times, and randomly selecting 250 particles, the spindle shape and the needle shape have a long axis diameter, and a plate shape. The shape and granularity are obtained by actually measuring the Feret diameter, obtaining a number distribution from the diameter and the number, multiplying a value obtained by dividing the standard deviation σ of the distribution by the average value M by 100, and expressing the result in%.

Further, the particle shape, average particle diameter, axial ratio and BET specific surface area of the hydrous ferric oxide particles and / or iron oxide particles are determined by the contact between the synthetic resin and the hydrous ferric oxide particles and / or iron oxide particles. It acts as a factor that determines the activity of the combustion catalyst through the size of the interface area.

As the hydrous ferric oxide particles in the present invention, any of goethite (α-FeOOH) particles, lipid crocite (γ-FeOOH) particles, and δ-FeOOH particles can be used. May be any of a spindle shape (bamboo leaf shape), a needle shape, a plate shape and the like, but a spindle-shaped hydrous ferric oxide particle is preferred in view of combustion efficiency, and a spindle-shaped goethite particle is particularly preferred. According to electron microscopic observation, the spindle-shaped hydrous ferric oxide particles are particles having an appearance in which many ultrafine fibers are bundled, and have a major axis diameter of 0.05 to 1.5 μm and an axial ratio (major axis). Diameter / short axis diameter-the same applies hereinafter) is 1 to 18 and the BET specific surface area is 30 to 250 m ² / g. Among them, the total sulfur content is 0.
It is preferable that the content of sodium is 2 wt% or less, the total amount of sodium is 0.5 wt% or less, and the particle size distribution is 50% or less. Furthermore, considering the combustion efficiency, the total sulfur content is 0.08 wt%
Hereinafter, the total sodium content is 0.3 wt% or less, the particle size distribution is 40% or less, the major axis diameter is 0.1 to 0.5 μm, the axial ratio is 3 to 15, and the BET specific surface area is 50 m ² / g or more. It is preferred that

The needle-shaped hydrous ferric oxide particles include not only needle-shaped particles but also needle-shaped particles having the appearance of dendrites appearing from some places.
2.0 μm, the axial ratio is 2 to 20, and the BET specific surface area is 10 to 200 m ² / g. Among them, it is preferable that the total sulfur content is 0.1 wt% or less, the total sodium content is 0.5 wt% or less, and the particle size distribution is 60% or less.
Considering the combustion efficiency, the total sulfur content is 0.05 wt% or less, the total sodium content is 0.3 wt% or less, the particle size distribution is 50% or less, the major axis diameter is 0.1 to 0.8 μm, and the Preferably, the ratio is 5 to 15, and the BET specific surface area is 15 to 100 m ² / g.

According to electron microscopic observation, the plate-like hydrous ferric oxide particles have a hexagonal plate-like or disk-like appearance, and have a plate surface diameter of 0.02 to 1.5 μm and a plate-like shape. The ratio (plate surface diameter / thickness-the same applies hereinafter) is about 3 to 15. Among them, the total sulfur content is 0.1 wt% or less, the total sodium content is 0.1 wt% or less, and the particle size distribution is 50% or less.
The following is preferred. Considering the combustion efficiency, the total sulfur content is 0.05 wt% or less, and the total sodium content is 0.0
It is preferable that the content is 5 wt% or less, the particle size distribution is 40% or less, the plate surface diameter is 0.03 to 0.5 μm, and the plate ratio is 5 to 10.

The hydrous ferric oxide particles of these various shapes are:
Neutralization reaction between aqueous ferrous salt solution and aqueous alkali solution such as aqueous alkali hydroxide solution and aqueous alkali carbonate solution An oxygen-containing gas such as air is passed through a suspension containing precipitates in the presence or absence of additives. By doing so, it can be produced from an aqueous solution.

The iron oxide particles used in the present invention include hematite (α-Fe ₂ O ₃ ) particles and magnetite (FeO x.
Fe ₂ O ₃ , 0 <x ≦ 1) particles, maghemite (γ-Fe
Any of ₂ O ₃ ) particles can be used, and the particle shape can be any of a spindle shape, a needle shape, a plate shape, and a so-called granular shape having a substantially isotropic shape such as a sphere, an octahedron, a polyhedron, and an irregular shape. Granular magnetite particles, spindle-shaped hematite particles, and spindle-shaped maghemite particles are preferred in terms of combustion efficiency, and among them, particulate magnetite particles are most preferred.

The spindle-shaped iron oxide particles and the acicular iron oxide particles have a major axis diameter of 0.03 to 1.0 μm, an axial ratio of 2 to 12, and a BET specific surface area of 5 to 200 m ² / g. . Among them, it is preferable that the total sulfur content is 0.2 wt% or less, the total sodium content is 0.5 wt% or less, and the particle size distribution is 50% or less. Considering the combustion efficiency, the total sulfur content is 0.1 wt% or less, the total sodium content is 0.35 wt% or less, the particle size distribution is 45% or less, and the long axis diameter is 0.05.
0.3 μm, axial ratio 3-10, BET specific surface area 20
Preferably it is １００100 m ² / g.

The granular iron oxide particles have an average particle diameter of 0.03.
１．０1.0 μm, BET specific surface area 2-30 m ² / g. Of these, it is preferable that the total sulfur content be 0.8 wt% or less, the total sodium content be 0.5 wt% or less, and the particle size distribution be 50% or less. Taking combustion efficiency into consideration, the total sulfur content is 0.6 wt% or less, the total sodium content is 0.25 wt% or less, the particle size distribution is 40% or less, and the average particle size is 0.
It is preferable that the BET specific surface area is 0.5 m to 0.5 m and the BET specific surface area is 4 m ² / g or more.

The spindle-shaped iron oxide particles and the needle-shaped iron oxide particles are obtained by mixing the spindle-shaped ferric oxide-containing particles and the acicular ferric oxide-containing particles obtained from the above-mentioned aqueous solution at 250 to 700 ° C in the air. To obtain spindle-shaped hematite particles or acicular hematite particles, and then these hematite particles are placed in a reducing atmosphere such as under a stream of steam.
By heating while maintaining the particle shape at 0 to 500 ° C. to form spindle-shaped magnetite particles or acicular magnetite particles, these magnetite particles can be further converted to 200 to 500 ° C. in air.
It can be obtained by oxidizing while maintaining the particle shape at 500 ° C. to obtain spindle-shaped maghemite particles or acicular maghemite particles.

The plate-like iron oxide particles are heated by heating a neutralized precipitate of an aqueous ferrous salt solution and an aqueous alkali solution in an autoclave to form plate-like hematite particles. In a lower reducing atmosphere 3
By heating the sheet-like magnetite particles while maintaining the particle shape at 00 to 500 ° C., the plate-like magnetite particles are further oxidized in the air while maintaining the particle shape at 200 to 500 ° C. to obtain plate-like maghemite particles. Can be obtained.

The particulate iron oxide particles are obtained by passing an oxygen-containing gas such as air through a suspension containing a precipitate obtained by neutralizing a ferrous salt aqueous solution with an aqueous alkali solution such as an aqueous alkali hydroxide solution and an aqueous alkali carbonate solution. By generating the granular magnetite particles, the magnetite particles are heated in air at 200 to 500 ° C.
The maghemite particles are further heated to 50 g by heating while maintaining the particle shape in the form of granular maghemite particles.
It can be obtained by heating at 0 to 900 ° C. while maintaining the particle shape to obtain granular hematite particles.

In the incineration method of the present invention, one or more selected from the above-mentioned hydrous ferric oxide particles and iron oxide particles can be appropriately selected in consideration of combustion characteristics and economy. Yes, with respect to 100 parts by weight of the incinerated material burned in the incinerator per unit time, 0.1 to 25 parts by weight of the ferric oxide particles or the iron oxide particles or the mixture of the particles per unit time, preferably Is 0.3 to 11 parts by weight,
Particularly preferably, it is necessary to cause 0.5 to 8.5 parts by weight to coexist in a combustion furnace for combustion. In addition, as will be described later, hydrous ferric oxide particles and iron oxide particles may cause a complex reaction in the combustion furnace and become another substance or particle shape,
The coexistence in the present invention includes the presence in the combustion furnace, including those changed in this way. When the amount of the coexisting ferric oxide particles and the particles of the iron oxide particles or the mixture of the particles per unit time is less than 0.1 part by weight, the effect of improving the combustion characteristics is insufficient. If the amount exceeds 0.0 parts by weight, not only the amount of residual ash after incineration increases, but also the cost increases, which is not preferable.

There is no particular limitation on the method of allowing these hydrous ferric oxide particles or iron oxide particles or a mixture of the particles to coexist in an incinerator. For example, powder or powder in the gas phase in an incinerator may be used. Examples thereof include a method of spray addition in a slurry state and a method of charging a synthetic resin composition in which ferric hydroxide particles or iron oxide particles or a mixture of the particles are kneaded in advance into a synthetic resin, and then putting the mixture into an incinerator. In particular, it is preferable to directly add the powder or slurry to the gas phase in the incinerator by spraying in the form of powder or slurry because the combustion catalyst activity can be exhibited most.

When the synthetic resin composition is put into an incinerator, it may be made of a thermoplastic resin such as polyethylene, polypropylene, vinyl chloride resin, polyester resin, polystyrene, nylon, polyurethane, acrylic resin, phenol resin, urea resin, epoxy resin or the like. Resins, synthetic resins such as thermosetting resins such as unsaturated polyester resins, preferably thermoplastic resins, particularly preferably low-density polyethylene, linear low-density polyethylene, high-density polyethylene, ethylene-vinyl acetate copolymer and the like. Use a mixture obtained by previously kneading ferric oxide particles or iron oxide particles with a mixing roll, a Banbury mixer, a kneader, a twin-screw kneading extruder, or the like with a typical polyethylene resin or polyolefin resin such as polypropylene. be able to. At that time, the ferric oxide particles and the iron oxide particles can be used after the particle surface is surface-treated with various surface treatment agents for the purpose of improving the dispersibility in the synthetic resin.

[0027]

In the incineration method of the present invention, the fact that the above-mentioned ferric hydroxide particles and iron oxide particles having a total amount of sulfur and a total amount of sodium which are equal to or less than a certain amount exhibits excellent combustion characteristics is described.
The present inventor thinks as follows. When burning a solid incineration material containing a synthetic resin having a hydrocarbon chain in its molecular structure, the incineration material is decomposed by heating, and the resulting combustible low molecular weight gas or vapor is combusted. <Decomposition and combustion> proceeds, but in order for decomposition and combustion to be performed quickly, (1) the incinerated material is immediately decomposed into a combustible low molecular weight gas component or vapor component by the action of heating and oxygen. (2) the generated flammable low molecular weight gaseous or vapor component under a sufficient supply of oxygen while passing through a complex route including elementary reactions via various lower molecular weight intermediates; It is necessary that the two processes of finally being converted into carbon dioxide and water by various active oxygen species such as hydroxyl radicals proceed in a well-balanced manner.

The hydrous ferric oxide particles and iron oxide particles present in the incinerator are stabilized by surface hydroxyl groups formed by the dissociation and adsorption of water to iron atoms on the surface. Dehydration occurs between hydroxyl groups to generate coordinatively unsaturated iron ions and oxygen ions. Coordinatively unsaturated oxygen ions formed on the surface of the ferric oxide particles or iron oxide particles in contact with the decomposition surface of the incinerated material or inside the incinerated material have a relatively low oxygen supply. It is considered to be insufficient to show catalytic activity mainly for dehydrogenation reaction from organic matter and carbon-carbon chain scission reaction, and to promote the above process (1).

In general, if the ratio of the catalytic activities of the dehydrogenation reaction and the carbon-carbon cleavage reaction is not appropriate, the ratio of hydrogen / carbon in the combustible components of the remaining synthetic resin is reduced, resulting in a combustible low molecular weight gas. Although the ratio of decomposition into components or vapor components decreases and it becomes difficult to combust, in the hydrous ferric oxide particles and iron oxide particles used in the present invention, the catalytic activity of the dehydrogenation reaction and the carbon-carbon cleavage reaction is reduced. Is appropriate, and the rate at which the combustible components of the remaining incinerated matter are decomposed into combustible low molecular weight gas components or vapor components is high.

The hydrous ferric oxide particles and iron oxide particles inside the incineration material are released into the gas phase as the decomposition and combustion of the incineration material progress. In the state where the ferric oxide particles and the iron oxide particles are suspended in the gas phase where the supply of oxygen is sufficiently performed,
The coordinatively unsaturated iron ions generated on the surfaces of the ferric oxide particles and the iron oxide particles adsorb oxygen and activate oxygen,
Various active oxygen species are produced to promote the above process (2).

However, the sulfur contained in the ferric oxide-containing particles and the iron oxide particles binds to the coordinatively unsaturated iron ions, lowers the catalytic activity, and behaves as sulfate ions during combustion to act as sulfate ions. Sintering is promoted to reduce the effective area of catalytic activity, and sodium also reacts with components in the residual ash to reduce catalytic activity.

Therefore, according to the above mechanism, the incinerated material containing the synthetic resin, the total sulfur content is 0.8 wt% or less, and the total sodium content is 0.5 wt% or less. When separately supplying and burning a mixture of hydrous ferric oxide particles or iron oxide particles or particles having a total amount of 1.0 wt% or less, the ferric oxide particles or iron oxide particles or iron oxide particles or If the mixture is directly spray-added into the gas phase in the incinerator, the catalyst activity of the process (2) is exhibited in the gas phase, and the ferric oxide particles and the iron oxide particles transferred to the surface of the incineration material. Alternatively, the mixture of the particles promotes the process (1) on the surface of the material to be incinerated.

On the other hand, when the total sulfur content is 0.8 wt%
And the total sodium content is 0.5 wt% or less,
When burning incinerated materials containing synthetic resin containing ferric oxide particles or iron oxide particles or a mixture of the particles in which the total amount of total sulfur and total sodium is 1.0 wt% or less, Although the process (1) is naturally activated by the particles contained in advance, it is sufficiently effective. However, in the gas phase in the incinerator, the ferric oxide particles or the iron oxide particles or the particles of the iron oxide particles or the iron oxide particles may be further added. It is more preferable to directly spray-add the mixture in a powder or slurry state, since the process (2) will be sufficiently activated.

[0034]

The present invention will be described in detail below with reference to examples and comparative examples. Example 1, Comparative Example 1 0.1 g of an incinerated substance having the composition shown in Table 1 was burned at a predetermined temperature for 20 minutes while flowing air at 1.0 liter / min. Leaching test of metals from the residual ash. Table 2 shows the composition of the gas generated by combustion, and Table 3 shows the results of the metal elution test. The spindle-shaped goethite particles used in this test had a total sulfur content of 0.061 wt.
%, Total sodium content is 0.18 wt%, particle size distribution is 36%, average particle size is 0.30 μm, axial ratio is 12, B
The ET specific surface area was 80 m ² / g.

[0035]

[Table 1]

[0036]

[Table 2]

[0037]

[Table 3]

As is clear from the results of Tables 1 to 3, the total sulfur content was 0.061% by weight and the total sodium content was 0.18%.
When the material to be incinerated in Example 1 in which wt.% spindle-shaped goethite was present was incinerated, the concentration of carbon monoxide in the gas generated at the time of combustion was lower than that in Comparative Example 1, and 80%.
Under low temperature combustion conditions such as 0 ° C., nitrogen oxides (NO
The amount of occurrence of x) was also reduced. In addition, in the case of Example 1, the amount of carbon recovered as a gas also showed almost the same value as the theoretical amount of carbon in the combustibles of the incinerated material of 45% at each temperature, indicating complete combustion. On the other hand, in the case of Comparative Example 1, when the temperature became higher than 900 ° C., the generation of soot increased, indicating that the amount of carbon recovered as a gas was smaller than the theoretical value, indicating that the combustion was incomplete. ing.

Further, Comparative Example 1 was determined based on the results of the metal dissolution test.
In the case of, lead and zinc were detected from the residual ash after incineration, whereas none of the residual ash after incineration in Example 1 was detected, and when the incineration method of the present invention was used, the residual ash was detected. It shows that it has the effect of collecting and insolubilizing heavy metals in it.

Next, the combustion characteristics in the case where the ferric oxide particles or the iron oxide particles are contained in the synthetic resin in advance will be described. The combustion characteristics of the synthetic resin composition were evaluated by the following method. The burning rate is obtained by weighing 10 mg of the synthetic resin composition and raising the temperature at a rate of 10 ° C./min in the air or under a low oxygen concentration (air / nitrogen = 1: 1) at 300 ml / min. The change in weight was measured by a thermogravimetric analyzer (manufactured by Seiko Denshi Kogyo Co., Ltd.), and the time required from the time when rapid weight loss started to the time when rapid weight loss ended (combustion occurred during this time) It is estimated that there is.)

The amount of residual combustible components (it is considered that the smaller the value is, the smaller the amount of unburned residue and ash after incineration is.) In the above measurement, the amount was calculated per combustible component at the time when the rapid weight loss was completed. It was shown by the residual weight ratio (%).

The low-temperature flammability (which is considered to be the temperature necessary for the organic matter to completely burn out) is indicated by the temperature at which weight loss does not occur any more in the above measurement.

Examples 2 to 11 and Comparative Examples 2 to 8 A synthetic resin composition having the composition shown in Table 4 was prepared by melt-kneading using an extruder, and the combustion characteristics were measured. Table 5 shows the results. For comparison, a synthetic resin composition comprising only high-density polyethylene or low-density polyethylene (Comparative Examples 2 and 3) containing no ferric oxide-containing particles or iron oxide particles at all, and low-density polyethylene with carbon A synthetic resin composition in which a predetermined amount of black or calcium carbonate is added (Comparative Examples 4 and 5), a synthetic resin composition in which spindle-shaped goethite particles of less than 0.1 wt% are added to low-density polyethylene (Comparative Example 6), Synthetic resin composition containing low-density polyethylene containing spindle-like goethite particles or granular magnetite particles having a large amount of total sulfur and total sodium (Comparative Example 7,
8) was prepared in the same manner as in the example, and the combustion characteristics were measured. The results are also shown in Table 5.

[0044]

[Table 4]

[0045]

[Table 5]

In Table 5 , the synthetic resin composition of the present invention according to the examples has a higher burning rate and the amount of residual combustible components as compared with the synthetic resin compositions of Comparative Examples 2 and 3 consisting only of high-density polyethylene or low-density polyethylene. It can be seen that the low temperature combustibility is improved. On the other hand, in the synthetic resin composition of Comparative Example 4 containing carbon black, the amount of residual combustible components was reduced and improved, but the burning rate and low-temperature combustibility were reduced as compared with Comparative Example 3, and the composition contained calcium carbonate. It can be seen that the synthetic resin composition of Comparative Example 5 has improved low-temperature flammability, but lowers the burning rate and does not significantly increase the amount of residual combustible components. In addition, it can be seen that when the content of the spindle-shaped goethite particles is less than 0.1 wt% as in the synthetic resin composition of Comparative Example 6, the combustion characteristics are not significantly improved.

Further, the total amount of sodium exceeds 0.5% by weight, and the total amount of the total amount of sulfur and the total amount of sodium is 1.0% by weight.
And the total sulfur content exceeds 0.8 wt%, and the total amount of total sulfur content and total sodium content is 1.0 wt%
% Of the synthetic resin composition containing more than 3% of particulate magnetite particles (Comparative Examples 7 and 8) has almost no effect of improving the combustion characteristics as compared with the synthetic resin compositions of Examples 3 and 4 containing less of these impurities. Was.

[0048]

According to the incineration method of the present invention, specific insoluble iron oxide particles or iron oxide particles acting as a combustion promoter coexist in an incinerator and are burned. It exhibits a combustion promoting effect when incinerated in an incinerator, so that even when the incinerator is operated under low-temperature, low-oxygen concentration conditions that are conventionally effective in suppressing NOx and preventing damage to the incinerator, the combustion efficiency And the generation of unburned residue and residual ash can be reduced.

In addition, the effects of reducing the amount of NOx, suppressing the generation of dioxin, etc. can be expected by the inherent combustion promoting action of the ferric oxide particles and the iron oxide particles. The iron oxide particles react with the oxides of heavy metals during incineration to form ferrite, which has the effect of reducing the solubility of heavy metals in the residual ash in water, thereby eliminating the need for conventional insolubilization treatment.

Further, when the ferric hydroxide particles and the iron oxide particles having such an effect are previously contained in the synthetic resin, the synthetic resin waste can be effectively reused as an energy source. ing.

Continued on the front page (72) Inventor Satoshi Saito 1-4 Meiji Shinkai 1-4, Otake City, Hiroshima Pref. Toda Kogyo Co., Ltd. (72) Inventor Minoru 1-4 Meiji Shinkai 1-4 Otake City, Hiroshima Pref. Toda Kogyo Co., Ltd. (56) References JP-A-6-117614 (JP, A) JP-A-2-242856 (JP, A) JP-A-52-107292 (JP, A) JP-A-53-39965 (JP, A) ( 58) Field surveyed (Int.Cl. ⁷ , DB name) F23G 5/027 B09B 3/00 F23C 11/00 F23G 7/12 F23G 5/02

Claims (4)

(57) [Claims] In a method of burning an incinerated material containing a synthetic resin in an incinerator, the total sulfur content is 0.8 wt% based on 100 parts by weight of the incinerated material burned in the incinerator per unit time.
Or less, and the total amount of sodium is 0.5 wt% or less, and the total amount of total sulfur and total sodium is 1.0 wt% or less. An incineration method characterized by coexisting and burning in a combustion furnace at a ratio of 0.1 to 25 parts by weight per unit. 2. The method according to claim 1, wherein the ferric oxide-containing particles or the iron oxide particles or a mixture of the particles is charged into an incinerator in a mode comprising at least one of a synthetic resin composition, a powder, and a slurry to be burned. The incineration method according to claim 1, wherein 3. The ferric hydroxide particles having a total sulfur content of 0.
The incineration method according to claim 1, wherein spindle-shaped goethite particles having a content of 2 wt% or less and a total sodium content of 0.5 wt% or less are used. 4. The iron oxide particles have a total sulfur content of 0.8 wt%.
2. The incineration method according to claim 1, wherein granular magnetite particles having a total sodium content of 0.5 wt% or less and a total of the total sulfur content and the total sodium content of 1.0 wt% or less are used. .