JP2001072793A - Process for treatment of waste plastic containing flame retardant component - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a process for separating and recovering a plastic component and a flame retardant component from a waste plastic efficiently without fail and, desirably, for using a part of the treated waste plastic effectively. SOLUTION: This process comprises the steps of: heating an organic solvent having a boiling point of at least 250 deg.C and an aromaticity index of at least 0.20 to a temperature being in the range of 200-400 deg.C and lower than its boiling point; immersing a waste plastic containing a flame retardant component in the heated organic solvent to separate it into a plastic component and a flame retardant component; and separately recovering the separated plastic and flame retardant components from the organic solvent. Desirably, the plastic component recovered from the organic solvent is crushed to process it into a fuel for a furnace and/or an iron source reductant.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for treating waste plastics containing a flame retardant component, and more particularly, to home appliances,
The present invention relates to a treatment method for separating plastic waste containing a flame retardant component used for OA equipment, toner and the like into a plastic component and a flame retardant component.

[0002]

2. Description of the Related Art In recent years, synthetic resins such as plastics have been increasing as industrial wastes and general wastes, and the treatment thereof has become a serious social problem including environmental protection. In particular, various properties of plastics (polyethylene, polypropylene, vinyl chloride, polystyrene, polycarbonate, etc.) are used for home appliances such as televisions and OA equipment, and these plastics have heat resistance and flame retardancy. In order to increase the flame retardant component such as an organic halogen compound (for example, tetrabromobisphenol A (TBA), decabromodiphenyl oxide (D
BDPO)).

When these waste plastics are incinerated, there are problems such as damage to the furnace wall of the incinerator due to the high calorific value of the plastics generated during combustion. To avoid this, dedicated incineration equipment is required. Become. In addition, when plastic is burned, corrosive gas (such as hydrogen chloride) derived from plastic-containing components is generated, and dust contained in waste gas contains harmful metals such as zinc and lead. Special equipment is required to detoxify harmful substances in corrosive gases and dust.

[0004] In addition, waste plastics containing a flame retardant component, in particular, have a problem in that when they are incinerated, harmful organic halogen compounds such as dioxin are generated. It is becoming a problem. Conventionally, as a method of separating waste plastic, a method of mechanically crushing waste plastic and separating and collecting the separated plastic is known.
Due to the nature of waste plastics containing a flame retardant component, it is difficult to separate the plastic component from the flame retardant component even by mechanical crushing.

[0005] Also, Japanese Patent Application Laid-Open No. 8-81685 discloses that
As a method for recovering gas and oil from waste plastic, a first step of swelling by mixing waste plastic with oil such as petroleum-based oil, and heating this mixture to 150 to 350 ° C. A second step of removing chlorine, and after mixing the dechlorinated mixture with a portion of the intermediate oil and the like recovered in the fourth step described below, the mixture is mixed under a specific pressure.
A third step of heating to 00 to 485 ° C. and a method of treating waste plastic by recovering gas and light oil from the heated mixture to obtain a mixture of medium oil, heavy oil and solids are shown. .

Japanese Patent Application Laid-Open No. 9-268297 discloses that waste plastic is mixed with an extraction solvent such as waste engine oil or waste lubricating oil at 100 to 200 ° C. for 30 to 120 ° C.
By heating for a minute, after extracting resin components such as polyethylene contained in waste plastic into the extraction solvent,
There is shown a method for treating waste plastic using solid-liquid separation to separate a solid component from an extraction solvent, and using a mixture of the remaining resin components such as polyethylene and the extraction solvent as fuel.

[0007]

However, these conventional techniques have the following problems. First, JP-A-8-8
According to the method disclosed in Japanese Patent No. 1685, chlorine derived from vinyl chloride contained in waste plastic can be removed as hydrogen chloride in the second step, but a flame retardant component such as an organic bromine compound is separated and removed from waste plastic. It is difficult. Also, since the recovered gas and oil contain decomposition products (such as organic bromine compounds) derived from flame retardant components, corrosive gases such as hydrogen bromide may be generated when these are used as fuel. This can cause corrosion of equipment.

Further, when the flame retardant component is treated at a high temperature exceeding 400 ° C., various organic bromine compounds are generated, which tends to cause operational problems (problems such as pipe clogging). There is also concern about the occurrence. In addition, since a removal facility for removing these harmful components is required, there is a problem that processing costs increase. In the method disclosed in Japanese Patent Application Laid-Open No. 9-268297, vinyl chloride contained in waste plastic is not dissolved in an extraction solvent and can be separated and recovered as a solid component. It is difficult to separate and remove the flame retardant component from the waste plastic.

As described above, there are various problems in the conventional waste plastic processing method. For this reason, at present, many waste plastics are disposed of in landfills. However, dumping of waste plastic causes deterioration of the land at the landfill site, and is not desirable from the viewpoint of environmental protection. In addition, recently, the shortage of landfill sites has become serious, There is a long-awaited desire to develop a mass processing method.

Accordingly, an object of the present invention is to solve the above-mentioned problems of the prior art and to provide a method of treating waste plastic which can efficiently and surely separate and collect a plastic component and a flame retardant component from waste plastic. Is to do. Another object of the present invention is to provide a method for treating waste plastic that can effectively utilize a part of the treated waste plastic.

[0011]

The features of the present invention for solving such a problem are as follows. [1] An organic solvent having a boiling point of 250 ° C. or higher and an aromatic index of 0.20 or higher is heated to a temperature of 200 ° C. to 400 ° C. and lower than the boiling point, and the heated organic solvent contains a flame retardant component. What is claimed is: 1. A method for treating waste plastic containing a flame retardant component, comprising immersing the plastic and separating the plastic component and the flame retardant component, and recovering the separated plastic component and the flame retardant component from an organic solvent. .

[2] The method for treating waste plastic according to the above [1], wherein the plastic component recovered from the organic solvent is crushed to be processed into a furnace fuel and / or an iron source reducing agent. A method for treating waste plastic containing a flame retardant component.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the processing method of the present invention will be described below. In the method for treating waste plastic of the present invention, an organic solvent having a boiling point of 250 ° C. or higher and an aromatic index of 0.20 or higher is heated to a temperature of 200 ° C. to 400 ° C. and equal to or lower than the boiling point. A waste plastic containing a flame retardant component is immersed in the mixture to separate it into a plastic component and a flame retardant component, and the separated plastic component and flame retardant component are collected from an organic solvent.

There are no particular restrictions on the waste plastics to be treated according to the present invention, for example, polystyrene, polyethylene, polypropylene, polycarbonate, ABS, P
It is a waste plastic containing one or more types such as MMA. The melting point (softening point) of these waste plastics varies depending on the resin, but is usually 100 to 200 ° C, and the decomposition start temperature is 300 ° C or higher. Representative flame retardant components contained in these waste plastics include, for example, tetrabromobisphenol A (TBA, melting point: 180
° C), decabromodiphenyl oxide (DBDPO,
Organic flame retardants such as octabromodiphenyl oxide (OBDPO, melting point: 70 to 150 ° C.). Usually, these flame retardant components have a specific gravity of 1.
5 or more. In addition, some include an inorganic flame retardant and a flame retardant aid (for example, antimony trioxide) in addition to the organic flame retardant component.

In the present invention, the organic solvent used for treating the waste plastic exists as a liquid at the treatment temperature (200 to 400 ° C.) of the waste plastic containing the flame retardant component, and almost decomposes at this treatment temperature. It is necessary that the properties such as viscosity do not change without any change. Furthermore, as the organic solvent, whether the separated plastic component exists in a liquid state in the organic solvent (however,
Depending on the case, a part thereof may exist in a solid state and / or a semi-solid state) or a substance which dissolves in an organic solvent while sedimenting and separating the flame retardant component in the organic solvent is desirable. Therefore, it is preferable that the organic solvent has a specific gravity smaller than that of the flame retardant component and a specific gravity larger than that of the plastic component.

The form in which the plastic component separated from the flame retardant component is present in the organic solvent may be a form in which the plastic component is dissolved in the organic solvent, or a liquid form without being dissolved (in some cases, a liquid form). Part is solid and / or semi-solid) and may be either dispersed in an organic solvent or suspended on the bath surface of the organic solvent. Both forms may coexist, but if possible, dissolve in the organic solvent. Without dispersing, it is preferable to disperse in an organic solvent or float on the bath surface of the organic solvent. This is because when the plastic component is dissolved in the organic solvent, the viscosity of the organic solvent changes, and the frequency of replacement of the organic solvent increases.

In the present invention, an organic solvent satisfying the above conditions has a boiling point of 250 ° C. or higher and an aromatic index of 0.1.
Use 20 or more organic solvents. Further, from the above viewpoint, the preferable boiling point of the organic solvent is 300 ° C. or more, and the preferable aromatic index of the organic solvent is 0.25 or more. When the boiling point of the organic solvent is lower than 250 ° C. (including the case where the boiling point of a part of the organic solvent is lower than 250 ° C.),
When the waste plastic is treated by heating to a temperature of 0 ° C. or higher, an organic solvent component having a boiling point of less than 250 ° C. volatilizes during the treatment, and the physical properties of the organic solvent change. In addition, equipment for removing the volatile components is required in the exhaust gas treatment step.

If the aromatic index of the organic solvent is less than 0.20 (including the case where the aromatic index of a part of the organic solvent is less than 0.20), the separated plastic component is almost completely contained in the organic solvent. Since the plastic component is completely dissolved and the dissolved plastic component is lightened, the plastic component cannot be separated and recovered from the organic solvent even by distillation.
Further, the stability of the organic solvent at a processing temperature of 200 to 400 ° C. is lacking, and aromatization or dealkylation of the organic solvent occurs during the reaction, and the physical properties of the organic solvent change.

The aromatic index is the ratio of aromatic carbon to the total number of carbon atoms, and is determined by the Brown-Ladner method (JK Brown, ER La
dner and N. Sheppard, Fuel, 39, 79 (1960)). The boiling point of the organic solvent is preferably 600 ° C. or less, more preferably 550 ° C. or less from the viewpoint of thermal stability. The aromatic index of the organic solvent is preferably 1.0 or less, more preferably 0.95 or less.

Specific examples of the organic solvent that can be used in the present invention include coal tar heavy oil, pitch, coal liquefied oil, petroleum vacuum distillation residue, ethylene bottom oil, and modified oil. Among these, those satisfying a boiling point of 250 ° C. or higher and an aromatic index of 0.20 or higher can be used alone or in combination of two or more. In particular, when the separated plastic component is used as a furnace fuel or an iron source reducing agent, it is preferable to use coal tar heavy oil having a low sulfur content from the viewpoint of exhaust gas treatment. In addition, this coal tar heavy oil may be used by partially mixing the above-mentioned other organic solvents, waste oil, waste lubricating oil, and the like as long as the performance of the organic solvent is not significantly reduced.
That is, a mixture of a coal tar heavy oil as a main component and another organic solvent can be used.

In order to properly separate waste plastic into a plastic component and a flame retardant component in an organic solvent, the temperature condition of the organic solvent is determined by changing the temperature of the plastic component contained in the waste plastic and the gaseous state by thermal decomposition. It is necessary to set the temperature condition such that no product is generated and the flame retardant component contained in the waste plastic is not decomposed or volatilized. The temperature condition (heating temperature) of this organic solvent varies to some extent depending on the properties of the plastic and the like.
The temperature may be set to 00 ° C., preferably 250 to 350 ° C., and the boiling point or lower. The waste plastic is immersed in an organic solvent heated to such a temperature, and the waste plastic is mixed with a plastic component and a flame retardant component (organic bromine compound, Inorganic compounds).

The reaction in which chlorine contained in vinyl chloride is desorbed as hydrogen chloride gas starts at about 200 ° C.
Finish at about 350 ° C. Therefore, under the above temperature conditions, it is possible to remove chlorine in vinyl chloride contained in waste plastic. Hydrogen chloride gas desorbed from vinyl chloride can be recovered as hydrochloric acid, for example, in a hydrochloric acid recovery device, or can be neutralized with an alkali.

The processing time (immersion time) of the waste plastic in the organic solvent is about 1 to 30 minutes, preferably 5 to 20 minutes.
It is appropriate to set it to about a minute. The processing pressure may be in the range of normal pressure or the autogenous pressure of the organic solvent at the processing temperature. For this reason, a special mechanism such as an airtight mechanism and a valve in the processing tank is not required, and the processing apparatus can have a simple device configuration. The atmosphere in which the waste plastic is immersed in the organic solvent is inert gas (nitrogen, argon gas, etc.) in order to prevent oxidation of the organic solvent and plastic components, burning of volatile components, and components such as dioxin. It is preferable to use a non-oxidizing gas atmosphere such as an atmosphere.

The plastic component and the flame retardant component separated in the organic solvent are respectively recovered from the organic solvent. The separated form of the plastic component in the organic solvent is such that the liquid plastic component (although part of the plastic component may exist in a solid and / or semi-solid state) in the organic solvent, In a state of being separated from the bath surface,
A state in which a liquid plastic component (however, a part thereof may be present in a solid and / or semi-solid state in some cases) is dispersed in an organic solvent, and a state in which the plastic component is dissolved in the organic solvent. Either one or two or more of these states coexist.

When the plastic component is in the above state, for example, the organic solvent containing the liquid plastic component is cooled to a temperature at which the plastic component solidifies to a solid phase (solid or semi-solid). After that, the organic solvent and the plastic component can be separated by a solid-liquid separation device such as a filter press, a screen, a centrifuge, and a vibrating sieve. When the plastic component is in the above-mentioned state, for example, the organic solvent and the plastic component can be separated by a distillation apparatus of a type such as heating distillation or vacuum distillation.

When the plastic component in the organic solvent is in the coexisting state of the above, for example, the plastic component solidifies the organic solvent containing the liquid plastic component and solidifies (solid or semi-solid). ), The organic solvent and the plastic component are separated by the above-described solid-liquid separation device, and then the plastic component dissolved in the organic solvent is separated by a distillation device such as heating distillation or vacuum distillation. it can.

Further, since the flame retardant component is settled and separated in an organic solvent, it can also be separated from the organic solvent by a solid-liquid separation device such as a filter press, a screen, a centrifuge, and a vibrating sieve. Since the inorganic flame retardant has very low solubility in an organic solvent and has a higher specific gravity than an organic solvent, it is also sedimented and separated in an organic solvent and separated and recovered in the same manner as a flame retardant component. You.

The plastic component recovered as described above does not contain a halogen component (chlorine or bromine) which is a source of corrosive gas or dioxin, and therefore, the fuel and / or the fuel of a furnace such as a blast furnace. It can be used as an iron source reducing agent. In this case, the plastic component recovered from the organic solvent is crushed into a shape suitable for the raw material of the furnace, and processed into a fuel and / or iron source reducing agent for the furnace.

FIG. 1 is a flowchart showing one embodiment of the present invention. In the figure, 1 is a processing device (separation reactor), 2
Is a separation device for separating an organic solvent and a plastic component, 3 is a separation device for separating an organic solvent and a flame retardant component, 4 is an organic solvent tank, 5 is a crushing treatment device, and 6 is a generated gas treatment device. It is. In the embodiment shown in FIG. 1, the organic solvent filled in the processing apparatus 1 is heated to the above-described temperature, and waste plastic containing a flame retardant component is supplied to the organic solvent and subjected to immersion processing.

The waste plastic immersed in the organic solvent in the processing apparatus 1 is separated into a plastic component and a flame retardant component. As described above, the separated plastic component is such that a liquid plastic component (although a part of the plastic component may exist in a solid state and / or a semi-solid state in some cases) floats on an organic solvent bath surface. Separated state, liquid plastic component (however, in some cases, a part may exist in solid and / or semi-solid form) dispersed in organic solvent, plastic component dissolved in organic solvent Or a state in which two or more of these coexist. Further, the flame retardant component is settled and separated in the organic solvent.

For this reason, the organic solvent containing the plastic component in the processing device 1 is supplied to the separation device 2 by an appropriate supply means, and the plastic component is separated and recovered from the organic solvent. The organic solvent containing the sedimented and separated flame retardant component is also supplied to the separation device 3 by an appropriate supply means, and the flame retardant component is separated and recovered from the organic solvent.

When the plastic component is present in the organic solvent in the above-mentioned form, the separating device 2 is constituted by a solid-liquid separating device such as a filter press, a screen, a centrifugal separator, a vibrating sieve and the like. After cooling the organic solvent containing the plastic component to a temperature at which the plastic component solidifies and becomes a solid phase (solid or semi-solid),
The plastic component can be separated from the organic solvent by the solid-liquid separation device, but is not limited thereto. When the plastic component is present in the organic solvent in the above-described form, the separation device 2 may be constituted by a distillation device that separates the plastic component from the organic solvent by a process such as heating distillation or vacuum distillation. Yes, but not limited to this.

When the plastic component in the organic solvent is in the above-mentioned condition (1), for example, the solid-liquid separation device and a distillation device for performing heating distillation, reduced pressure distillation, etc. are provided as the separation device 2. After cooling the organic solvent containing the liquid plastic component to a temperature at which the plastic component solidifies and becomes a solid phase (solid or semi-solid), the organic solvent and the plastic component are separated by the solid-liquid separator. Then, the plastic component dissolved in the organic solvent is separated by a distillation apparatus. Further, the separation device 3 for separating the organic solvent and the flame retardant component can be constituted by a solid-liquid separation device such as a filter press, a screen, a centrifuge, and a vibrating sieve, but is not limited thereto. It is not something to be done.

The organic solvent separated from the plastic component and the flame retardant component by the separation devices 2 and 3 is sent to the organic solvent tank 4 and is circulated to the treatment device 1. The plastic component separated from the organic solvent is crushed by the crushing device 5 to a particle size that can be put into a furnace such as a blast furnace. The crushing device 5 may be a single-shaft crusher, a two-shaft crusher, or the like, regardless of its type, as long as it can crush plastic to a particle size that can be put into a furnace.

The gas generated in the processing apparatus 1 is sent to a generated gas processing apparatus 6, where it is rendered harmless. For example, when the generated gas contains hydrogen chloride,
It is preferable to provide a hydrochloric acid recovery device for recovering hydrogen chloride as hydrochloric acid or a neutralization device for neutralizing hydrogen chloride with alkali. Further, the generated gas treatment device 6 may be provided with a combustion furnace for burning the generated gas, and provided with the hydrochloric acid recovery device or the neutralization treatment device for detoxifying hydrogen chloride downstream thereof. May be.

[0036]

EXAMPLES [Invention Example 1] Boiling point 350 ° C. as organic solvent
As described above, a coal tar heavy oil having an aromatic index of 0.9 (aromatic index measured by the Brown-Ladner method, the same applies hereinafter) was used. 20% by weight of tetrabromobisphenol A as a flame retardant component and 4 parts of antimony trioxide as a flame retardant aid component
50 g of a polystyrene resin containing 3 wt%
After performing the treatment of immersion in the organic solvent heated to 00 ° C. for 15 minutes, the plastic component and the flame retardant component were respectively recovered from the organic solvent, and the recovery rates of the plastic component and the flame retardant component were determined. At the same time, the decomposition rate of the plastic was determined from the components of the generated gas, and the content of bromine (bromine derived from the flame retardant component) in the recovered plastic component and the concentration of the organic bromine compound in the generated gas were measured. Table 1 shows the results.

[0037] In recovering the plastic component from the organic solvent, first, mainly the liquid plastic component floating in the organic solvent and on the bath surface thereof is taken out together with the organic solvent, and the organic solvent containing the liquid plastic component is removed. Was cooled to a temperature at which the plastic component solidified and became a solid phase (solid or semi-solid), and then subjected to solid-liquid separation using a filter press to separate a solid plastic component. Next, the organic solvent after the separation of the solid plastic was subjected to a vacuum evaporator to separate a plastic component dissolved in the organic solvent. Then, the amount of plastic separated from the organic solvent in the two-stage separation process was measured, and the recovery rate of the plastic component was determined. In addition, the recovery of the flame retardant component from the organic solvent is performed by taking out the flame retardant component settled in the organic solvent, separating the solid by a filter press, and separating the solid flame retardant component, The amount of this flame retardant component was measured to determine its recovery.

[Inventive Example 2] Boiling point of 350 as organic solvent
3 ° C., petroleum vacuum distillation residue with an aromatic index of 0.47
A polystyrene resin was treated in the same manner as in Example 1 of the present invention, except that the plastic component and the flame retardant component were recovered from the organic solvent, except that the plastic component and the flame retardant component were used. Was determined.
At the same time, the decomposition rate of the plastic was determined from the components of the generated gas, and the content of bromine (bromine derived from the flame retardant component) in the recovered plastic component and the concentration of the organic bromine compound in the generated gas were measured. Table 1 shows the results.

[Invention Example 3] The above-mentioned Inventive Example was carried out except that a coal tar heavy oil having an aromatic index of 0.65 from which a boiling point component lower than 300 ° C. was removed and heated to 300 ° C. was used as an organic solvent. After treating the polystyrene resin in the same manner as in 1, the plastic component and the flame retardant component were respectively recovered from the organic solvent, and the recovery rates of the plastic component and the flame retardant component were determined. At the same time, the decomposition rate of the plastic was determined from the components of the generated gas, and the content of bromine (bromine derived from the flame retardant component) in the recovered plastic component and the concentration of the organic bromine compound in the generated gas were measured. Table 1 shows the results.

[Inventive Example 4] Boiling point of 350 as organic solvent
C. or higher, and alkyl diphenyl having an aromatic index of 0.86
A polystyrene resin was treated in the same manner as in Example 1 of the present invention, except that the plastic component and the flame retardant component were recovered from the organic solvent, except that the plastic component and the flame retardant component were used. Was determined.
At the same time, the decomposition rate of the plastic was determined from the components of the generated gas, and the content of bromine (bromine derived from the flame retardant component) in the recovered plastic component and the concentration of the organic bromine compound in the generated gas were measured. Table 1 shows the results.

[Inventive Example 5] Except that 50 g of a polystyrene resin containing 15% by weight of decabromodiphenyl oxide as a flame retardant component and 3% by weight of antimony trioxide as a flame retardant aid component was used as a waste plastic to be treated. After treating the polystyrene resin in the same manner as in Example 1 of the present invention, the plastic component and the flame retardant component were respectively recovered from the organic solvent, and the recovery rates of the plastic component and the flame retardant component were determined. At the same time, the decomposition rate of the plastic was determined from the components of the generated gas, and the content of bromine (bromine derived from the flame retardant component) in the recovered plastic component and the concentration of the organic bromine compound in the generated gas were measured. Table 1 shows the results.

COMPARATIVE EXAMPLE Petroleum-based vacuum distillation residue having a boiling point of 280 ° C. or higher and an aromatic index of 0.15 was used as an organic solvent.
After the polystyrene resin was treated in the same manner as in Example 1 of the present invention except that it was heated to 0 ° C., the plastic component and the flame retardant component were respectively recovered from the organic solvent, and the plastic component and the flame retardant component were recovered. The recovery was determined. At the same time, the decomposition rate of the plastic was determined from the components of the generated gas, and the content of bromine (bromine derived from the flame retardant component) in the recovered plastic component and the concentration of the organic bromine compound in the generated gas were measured. Table 1 shows the results.

According to Table 1, in Examples 1 to 5 of the present invention, the plastic recovery rate was high, and the amount of bromine in the recovered plastic was extremely low. Therefore, the recovered plastic component can be suitably used as a fuel and / or iron source reducing agent for a furnace such as a blast furnace. In addition, almost no bromine compound was found in the generated gas, and it was found that almost all of the flame retardant component contained in the waste plastic to be treated was settled and separated in the organic solvent.

On the other hand, in the comparative example, the plastic recovery rate was low, and the unrecovered plastic was completely dissolved in the organic solvent, and the dissolved plastic component was lightened, so that it could not be recovered by the distillation method. In this comparative example, the recovery of the flame retardant component is also low. Furthermore, it is understood that the bromine concentration in the plastic component is higher than that of the examples of the present invention, and it is not suitable as a fuel and / or iron source reducing agent for furnaces such as blast furnaces.

[0045]

[Table 1]

[0046]

As described above, according to the present invention, the plastic component and the flame retardant component can be efficiently and reliably separated and recovered from the waste plastic, respectively. Therefore, the flame retardant separated from the waste plastic can be obtained. A plastic component containing no component can be incinerated without generating harmful substances such as dioxin or an organic bromine compound causing corrosion, or can be used as a furnace fuel or an iron source reducing agent. Further, it becomes possible to efficiently recover the flame retardant component and the flame retardant auxiliary component from the waste plastic.

Further, according to the invention of claim 2 of the present application, the plastic component separated from the waste plastic can be appropriately used as a furnace fuel or an iron source reducing agent. Harmful substances and organic bromine compounds which cause corrosion can be prevented.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a processing flow according to an embodiment of the present invention;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Processing apparatus, 2, 3 ... Separation apparatus, 4 ... Organic solvent tank, 5 ... Crushing processing apparatus, 6 ... Generated gas processing apparatus

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hiroyuki Hiroba 1-1-2 Marunouchi, Chiyoda-ku, Tokyo Inside Nihon Kokan Co., Ltd. (72) Inventor Tatsuro Ariyama 1-1-2 Marunouchi, Chiyoda-ku, Tokyo No. Nippon Kokan Co., Ltd. F term (reference) 4F301 AA12 AA15 AA20 AA26 AB03 CA04 CA07 CA12 CA43 CA53 CA72 4K001 BA22 CA05

Claims (2)

[Claims] 1. A boiling point of not lower than 250 ° C. and an aromatic index of 0.20.
The above organic solvent is heated to a temperature of 200 ° C. to 400 ° C. and lower than the boiling point thereof, and a waste plastic containing a flame retardant component is immersed in the heated organic solvent, and this is mixed with a plastic component and a flame retardant component. A method for treating waste plastic containing a flame retardant component, wherein the separated plastic component and the flame retardant component are respectively recovered from an organic solvent. 2. The waste plastic containing a flame retardant component according to claim 1, wherein the plastic component recovered from the organic solvent is crushed to be processed into a furnace fuel and / or an iron source reducing agent. Processing method.