JP2000256687A - Plastic-treating method and solid fuel and reducing agent for ore obtained by terating method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for treating plastics by which there can be obtained a solid fuel and a reducing agent for ores that have a reduced amount of chlorine and excellent crushability, and also a solid fuel and a reducing agent for ores, both prepared by the treating method, and a method for blowing a plastic-treated matter into a vertical furnace. SOLUTION: The plastic-treating method comprises dechlorinating a chlorine- containing plastic by heating, adding one or more members selected from iron, iron oxide and iron hydroxide to the plastic, followed by thermal treatment, cooling and solidification. Moreover, a solid fuel that is made of a plastic-treated matter, and a reducing agent for ores are obtained by the method. In addition, there is also provided a method for blowing a plastic-treated matter into a vertical furnace wherein the plastic-treated matter obtained by the plastic- treating method is blown into a race way of a vertical furnace of making pig iron.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for treating plastic, a solid fuel obtained by the treatment method, a solid fuel having a very good crushability, a reducing agent for ore, and a plastic treatment for a rigid furnace. It relates to the method of blowing things.

[0002]

2. Description of the Related Art In recent years, a large amount of waste plastic has been discharged along with an increase in the amount of plastic used, and its disposal has become a major social problem. As one of means for effectively utilizing waste plastics without reclamation or incineration, a method of using waste plastics as a solid fuel is known.

[0003] That is, a method of pulverizing waste plastic into a solid fuel (see Japanese Patent Application Laid-Open No. 4-332792), pulverizing a solid obtained by heating and melting the waste plastic in the presence of a solvent, and then cooling and solidifying. (See Japanese Patent Publication No. 57-16160). On the other hand, when using waste plastic as a solid fuel, it is necessary to sufficiently pulverize it to improve transportability, storage properties, flammability, and the like.

However, plastics are not always excellent in pulverizability because plastics are tough and excellent in ductility and are easily softened by frictional heat during pulverization. Therefore, long-term pulverization is necessary to obtain a fine powdery solid fuel or reducing agent for ore from waste plastics, and in some cases, a fine powdery powder that can sufficiently satisfy transportability, storability, and flammability. It was difficult to get one.

As a means for improving the crushability of plastics, it is effective to promote the decomposition of waste plastics to reduce the molecular weight. As a decomposition catalyst, aluminum chloride (see JP-A-6-220463) ), Silica-alumina (see JP-A-9-59647), zeolite (see JP-A-7-197033), iron oxide (see JP-A-8-179647).
No. 81685).

However, aluminum chloride, silica-alumina, and zeolite are expensive and have too high a catalytic activity, so that the decomposition of waste plastic proceeds more than necessary, and oily decomposition products and gaseous decomposition products are generated. There is a problem that the solid yield decreases. On the other hand, iron oxide has a lower catalytic activity for decomposing plastic than the above-mentioned catalyst, and the generation of the above-mentioned oily decomposition products and gaseous decomposition products is relatively small. It is preferable as a catalyst for obtaining an excellent solid fuel.

On the other hand, waste plastics contain chlorine-containing plastics typified by vinyl chloride resin, and when used as a solid fuel or a reducing agent for ore, hydrogen chloride is generated, resulting in a furnace or equipment. There is a problem that causes corrosion. Therefore, when waste plastic is used as a solid fuel or a reducing agent for ore, it is necessary to previously perform a dechlorination treatment at a temperature of 150 to 350 ° C.

During the above-described dechlorination treatment, chlorine in the waste plastic becomes hydrogen chloride or chlorine (Cl ₂ ) and is removed from the waste plastic as a gaseous substance. However, when performing the above-described dechlorination treatment, if an iron-based decomposition catalyst such as the above-mentioned iron oxide is present, it reacts with the generated hydrogen chloride or chlorine to form iron chloride and remains in a solid. There is a problem that can not be.

Further, International Publication No. WO 96/40839 discloses a method for thermally decomposing plastics using iron hydroxide, iron oxide or the like as a catalyst in a steam atmosphere or an atmosphere in which steam and an inert gas coexist. However, this method is a method for obtaining light oil, and furthermore, there is a risk of steam explosion due to steam.

[0010]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems of the prior art, and provides a solid fuel and a plastic capable of obtaining a reducing agent for ore having a low chlorine content and excellent in crushability. It is an object of the present invention to provide a processing method of (1), a solid fuel produced by the processing method, a reducing agent for ore, and a method of injecting a plastic processing product into a solidified furnace.

[0011]

According to a first aspect of the present invention, a chlorine-containing plastic is heated and subjected to a dechlorination treatment.
This is a plastic processing method characterized by adding one or more selected from iron oxide and iron hydroxide, further heat treating, cooling and solidifying. In a more preferred embodiment of the first invention, a chlorine-containing plastic and an organic solvent are mixed, and the mixture is heated and dechlorinated.
This is a plastic processing method characterized by adding a seed or two or more kinds, further heat-treating, then cooling and solidifying (a first preferred embodiment of the first invention).

In a further preferred aspect of the first aspect of the present invention, a chlorine-containing plastic and an organic solvent are mixed, and the mixture is heated and dechlorinated. This is a plastic processing method characterized by adding one or more kinds selected from iron, further heat treating, removing an organic solvent, and then cooling and solidifying (the second invention of the first invention). Preferred embodiment).

[0013] The second invention is the first invention, the first invention described above.
A solid fuel which is a plastic processed product obtained by the method for processing plastic according to any one of the first preferred embodiment of the invention and the second preferred embodiment of the first invention. According to a third aspect of the present invention, there is provided a plastic processed product obtained by the method for processing a plastic according to any one of the first aspect, the first preferred aspect of the first aspect or the second preferred aspect of the first aspect. An ore reducing agent.

A fourth invention is the first invention, the first invention.
Blowing the plastic processed product obtained by the method for processing plastic according to any one of the first preferred embodiment of the present invention or the second preferred embodiment of the first invention into a raceway of a hard furnace for producing pig iron. This is a method for blowing a plastic processed product into a rigid furnace. Incidentally, the chlorine-containing plastic to be treated in the present invention is a plastic containing chlorine alone in a molecular structure such as polyvinyl chloride or polyvinylidene chloride, or a mixture thereof, or
It is a mixture of a plastic containing chlorine in its molecular structure and a plastic containing no chlorine in its molecular structure.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention relates to the present invention.
I. Chlorine-containing plastics, II. Dechlorination treatment, III. Addition of iron-based additives, IV. Grinding method, V. Reducing agent for solid fuel and ore will be described in more detail in this order. [I. Chlorine-containing plastic:] The chlorine-containing plastic according to the present invention is a chlorine-containing plastic such as polyvinyl chloride, polyvinylidene chloride, and chlorinated polyethylene.

The chlorine-containing plastics in the present invention include, in addition to the above-mentioned chlorine-containing plastics, polyolefins such as polyethylene and polypropylene, polystyrene, polyethylene terephthalate, polycarbonate, nylon and other thermoplastic resins, and thermosetting resins. It is more preferable that these are also mixed. Examples of this include waste plastic and containers and packaging materials contained in municipal waste, industrial waste, and the like, and waste plastic generated in the dismantling process of electric products and automobiles.

Further, paper, fibers, woods, glasses, metals, etc. other than plastics may be contained as long as the grindability and flammability are not impaired, but before processing according to the method of the present invention. At the minimum, these foreign substances are removed by hand sorting, magnets, sorting using wind power, or
When the plastic is heated and melted during dechlorination and heat treatment described later, it is also possible to remove these foreign substances by filtration or the like.

The chlorine-containing plastic used as a raw material can be processed as it is, but it is also preferable to roughly pulverize the plastic in advance in order to facilitate the supply of the chlorine-containing plastic into a reaction vessel for dechlorination. [II. Dechlorination Treatment] In the present invention, one or more selected from iron, iron oxide and iron hydroxide are added in order to reduce the chlorine content in the finally obtained solid. Before performing the dechlorination treatment.

This is because when dechlorination is performed after adding iron, iron oxide, and iron hydroxide, chlorine remains in the form of iron chloride or the like as described above, and solid fuel or ore is used. This is because when used as a reducing agent, furnaces and equipment corrode. The processing temperature of the chlorine-containing plastic when performing the dechlorination treatment by heating the chlorine-containing plastic is preferably 15
0 ° C. or higher, more preferably 150 to 400 ° C., still more preferably 150 to 350 ° C., most preferably 200 to 350 ° C.
In the range of 320 ° C.

When the temperature of the dechlorination treatment is lower than 150 ° C., sufficient dechlorination is not carried out. On the other hand, when the temperature exceeds 400 ° C., oiling and gasification of chlorine-containing plastics proceed, and the solid yield decreases. . The dechlorination time is not particularly limited because it varies depending on the processing temperature and the processing amount of the chlorine-containing plastic, but is preferably 20 minutes to 5 hours, and more preferably 30 minutes to
More preferably, it is 4 hours.

If the dechlorination treatment time is less than 20 minutes, sufficient dechlorination cannot be achieved. Conversely, if the dechlorination treatment time exceeds 5 hours, oiling and gasification of the chlorine-containing plastic proceeds, The solids yield decreases. Hydrogen chloride and chlorine generated in the dechlorination process can be collected and collected and reused as a gas, or dissolved in water and recovered as hydrochloric acid.
It can be reused.

The dechlorination treatment may be carried out by directly heating the chlorine-containing plastic, but is desirably carried out in the presence of an organic solvent because of the ease of stirring. When an organic solvent is used, the organic solvent may be dissolved plastic and / or
Alternatively, as long as it swells, the type thereof is not particularly limited, but it is preferable to use a petroleum organic solvent and / or a coal organic solvent in terms of availability, price, and the like.

In the present invention, it is effective to set the dechlorination temperature to 150 ° C. or higher when using an organic solvent in order to improve the solubility, agitation and dechlorination rate of the plastic. Therefore, as an organic solvent, the boiling point is 150
It is preferable to use one having a temperature of not less than ° C. Therefore, as the petroleum organic solvent, it is more preferable to use one or more selected from A heavy oil, C heavy oil, light oil and kerosene.

Further, as the coal organic solvent, it is preferable to use coal tar and / or a distillate of coal tar. Specific examples of the coal-based organic solvent include coal-based tar, crude naphtha oil that is a distillate of coal-based tar, naphthalene washing oil, creosote oil, anthracene oil, and the like.These solvents are used alone. Or a mixture of two or more of these.

By heating with these organic solvents, the viscosity of the object to be treated is lowered, and not only the stirring becomes easy, but also the uniform heating becomes possible. As a result, excessive decomposition of the plastic due to local heating. In addition, it is possible to suppress oiling and increase the solid recovery rate. The weight ratio of the organic solvent to the chlorine-containing plastic in the mixture of the chlorine-containing plastic and the organic solvent, that is, the preferred range of the organic solvent / chlorine-containing plastic [weight ratio] is 0.1 to 10, more preferably 0.5 to 5 Range.

When the weight ratio is less than 0.1, the viscosity of the system becomes high, handling becomes difficult, and dechlorination hardly occurs. Conversely, if the weight ratio exceeds 10, it is disadvantageous in terms of the size of the reaction vessel and the distillation cost when removing the organic solvent from the plastic processing product. In addition, the weight of the chlorine-containing plastic in the above weight ratio is, when the chlorine-containing plastic to be treated is a mixture (mixture) of a plastic containing chlorine in the molecular structure and a plastic not containing chlorine in the molecular structure, Indicates the total weight of the plastic to be treated.

[III. Addition of iron-based additive:] In the present invention, after dechlorination treatment, one or more kinds selected from iron, iron oxide and iron hydroxide (also referred to as iron-based additive) are added. Added. Iron-based additives are preferred because they have many weak acid sites as catalysts. The iron-based additive used in the present invention is one or more selected from iron such as iron powder, iron oxide and iron hydroxide.

The iron valence of iron oxide and iron hydroxide may be any of +3 and +2. An example of iron oxide is iron ore. The shape and size of the iron-based additive are not particularly limited, but those having a particle size of 1 mm or less are preferable from the viewpoint of the catalytic effect. It is necessary to add these iron-based additives after the above-mentioned dechlorination treatment is completed.

The completion of the above-mentioned dechlorination treatment is preferably when the chlorine remaining in the object to be treated is 1% by weight or less, more preferably 0.8% by weight or less. In the present invention, after the addition of the iron-based additive, it is further heated and melted at a temperature of preferably 150 to 350 ° C., more preferably 200 to 330 ° C. (: heat treatment) to decompose the chlorine-containing plastic, Apply a drop.

The above-mentioned heating and melting are preferably carried out for 20 minutes or more.
The reaction is carried out for 5 hours, more preferably 30 minutes to 4 hours. If the heating and melting time is less than 20 minutes, the decomposition of the chlorine-containing plastic does not proceed sufficiently, and the crushability of the obtained solid is not sufficient. Conversely, if the heating / melting time exceeds 5 hours, the liquefaction and gasification of the chlorine-containing plastic proceeds, and the solid yield decreases.

The amount of the iron-based additive is not particularly limited, but is preferably from 0.1 to 50 parts by weight, more preferably from 0.5 to 30 parts by weight, and still more preferably from 1 to 50 parts by weight, based on 100 parts by weight of the total amount of the plastic to be treated. 20 parts by weight. If the amount of the iron-based additive is less than 0.1 part by weight, the decomposition reaction of the plastic does not proceed sufficiently, and the crushability of the obtained solid is not sufficient. Not only does efficiency drop, but also plastic oiling,
Gasification proceeds easily, and the yield of solids decreases.

According to the present invention, when the plastic processed product obtained by the present invention is used as a reducing agent for iron ore, the iron-based additive is recovered as metallic iron, and when used as a fuel for a boiler or cupola, fly ash or Collected as slag. In the present invention, when an organic solvent is used, it may be cooled and solidified without desolvation, and may be used as a solid fuel or a reducing agent for ore, but a part or all of these organic solvents are recovered by distillation. , May be reused.

As the distillation method, any of normal pressure distillation and reduced pressure distillation may be used, but reduced pressure distillation is preferable because the efficiency of removing low boiling components is high. In addition, when the residual amount of the organic solvent in the obtained solid is reduced, it is possible to prevent secondary aggregation of the particles during and after the pulverization of the plastic processed product. The remaining amount of the organic solvent in the solid is not particularly limited,
It is preferably at most 50% by weight.

[IV. Grinding Method:] The solid plastic processed product obtained by the present invention may be used as it is, but pulverized into a powder is more excellent in handling properties. As the pulverizer, any type of pulverizer may be used. For example, a hammer mill, a bin mill, a jet mill, a ball mill, a vibration ball mill, a centrifugal ball mill, or the like can be used.

In particular, as a method for obtaining fine powder, it is preferable to use a hammer mill or a vibration ball mill. [V. Reducing agent for solid fuel and ore:] According to the present invention,
It is possible to obtain a solid fuel and an ore reducing agent excellent in pulverizability.

That is, for example, the diameter of an 80% passing sieve described below is
Solid fuel and ore reducing agent of 1.5mm or less can be obtained. The solid plastic processed product obtained by the present invention can be used as a solid fuel for boilers, kilns, cupolas and the like. Further, it can be used as a raw material fuel such as a reducing agent for ores such as iron ore, that is, a reducing agent for a solid furnace for producing pig iron such as a blast furnace.

When used as a reducing agent in a hard furnace for producing pig iron such as the above-mentioned blast furnace, it can be charged from the furnace top of the hard furnace, but the efficiency of use as a reducing agent and fuel can be reduced. From the surface, it is preferable to blow into the raceway formed in front of the blowing tuyere of the rigid furnace. Further, in this case, it is preferable to blow a fine powdery plastic obtained by pulverizing the plastic processed product obtained in the present invention into the raceway.

It is also possible to blow into the raceway a slurry obtained by mixing the finely divided plastic obtained by pulverizing the processed plastic obtained with the present invention with heavy oil.
As a method of blowing into the raceway, any of a blow pipe method and a tuyere blowing method can be used, and the blowing method is not particularly limited.

[0039]

EXAMPLES The present invention will be described below more specifically based on examples. First, a grindability evaluation test in this example will be described. [Pulverizability evaluation test:] A hammer mill type pulverizer (manufactured by Horai Iron Works) was equipped with a sieve with a mesh size of 2 mm (hole), and the sample was 300 g
And pulverized for 15 minutes, and the pulverized product (fine powder) was sieved on and under the sieve.

Under the sieve, the opening is 1.18 mm (square hole).
And a sieve having an opening of 0.6 mm (square hole). After the above sieving, the weight fraction of each of the four fractions having a particle size of more than 2 mm, a particle size of more than 1.18 mm, 2 mm or less, a particle size of more than 0.6 mm, 1.18 mm or less, and a particle size of 0.6 mm or less is measured. did.

Next, the following equation (1) [Rosin-Rammler-Bennet
Substituting the weight fraction and the sieve diameter of each of the above-obtained four fractions into the following equation (2) obtained by modifying the above equation, the proportional constant of the following equation (2) is obtained by the least square method. n and b were determined. R (Dp) = 100 · exp ｛− (Dp / De) ⁿ ｝ ……………… (1) log ｛log [100 / R (Dp)]｝ = n · logDp + log (b) …… ... (2) In the above formulas (1) and (2), R (Dp) is the weight% on the integrated screen of the sieve Dp, and De is the particle size characteristic number [: a number corresponding to R (Dp) = 36.8% by weight] , N is an even number (: an index for evaluating the uniformity of the particle size distribution of the granular material), and b is a constant, which is an index for evaluating the fineness of the granular material.

Next, based on the obtained linear formula, the diameter of the sieve through which 80% by weight of all the particles pass [the diameter of the sieve passing 80%, D (8
0), which was used as an index of the fineness of the pulverized particles. That is, the smaller the value of D (80), the better the pulverizability of the test sample. (Example 1) 90 g of polyethylene resin pellets, 78 g of polypropylene resin pellets, 108 g of polystyrene resin pellets, and polyethylene terephthalate resin pellets
After mixing 6 g and hard polyvinyl chloride resin pellets 18 g (all commercially available), the mixture was charged into a 2.5-liter stainless steel reaction vessel, and stirred at 320 ° C. for 3 hours to perform a dechlorination treatment.

Hydrogen chloride generated during heating and stirring was trapped in a water tank, and titrated with a 2N-NaOH standard aqueous solution using phenolphthalein as an indicator. As a result, the amount of generated hydrochloric acid was 10.2 g, and the dechlorination rate calculated from the theoretical hydrochloric acid content was 98.0%. Further, about 2 g of the processed product in the reaction vessel was sampled and analyzed by an ion chromatograph. As a result, the residual chlorine amount in the processed product at the time when the dechlorination operation was completed was 0.104% by weight.

Subsequently, after the dechlorination was completed, 15 g of iron oxide (manufactured by Kanto Chemical Co., Fe ₂ O ₃ ) was added at a temperature of 320 ° C., and the mixture was further heated and melted for 2 hours, and then the reaction vessel was cooled. The solid was removed. Approximately 2 g of the solids taken out were sampled, and the content of chlorine was measured with an ion chromatograph.

The remaining about 300 g was subjected to the above-mentioned pulverizing and classifying operations to calculate an 80% sieve diameter [: D (80)]. Table 1 shows the obtained results together with the processing conditions. Example 2 90 g of polyethylene resin pellets, 78 g of polypropylene resin pellets, 108 g of polystyrene resin pellets, and polyethylene terephthalate resin pellets
After mixing 6 g of hard polyvinyl chloride resin pellets and 18 g of hard polyvinyl chloride pellets (all commercially available), the mixture was put into a 2.5-liter stainless steel reaction vessel together with 600 g of heavy oil, and stirred at 320 ° C. for 3 hours for dechlorination. Was.

Hydrogen chloride generated during heating and stirring was trapped in a water bath and titrated with a 2N-NaOH standard aqueous solution using phenolphthalein as an indicator. As a result, the amount of generated hydrochloric acid was 10.4 g, and the dechlorination rate calculated from the theoretical hydrochloric acid content was 98.9%. Further, about 2 g of the processed product in the reaction vessel was sampled and analyzed by an ion chromatograph. As a result, the residual chlorine amount in the processed product at the time when the dechlorination operation was completed was 0.037% by weight.

After completion of the dechlorination, 15 g of iron oxide (commercial product, Fe ₂ O ₃ ) was added at a temperature of 320 ° C.
After heating and melting for hours, vacuum distillation is performed to
0 g was recovered. Thereafter, the reaction vessel was cooled and a solid was taken out. Sampling about 2g of the solids taken out,
Further, the chlorine content was measured with an ion chromatograph.

The remaining about 300 g was subjected to the above-mentioned pulverizing and classifying operations to calculate an 80% passing sieve diameter [: D (80)]. Table 1 shows the obtained results together with the processing conditions. (Example 3) Approximately 5 kg of plastic containers, plastic trays, and wraps used at home were collected, washed with water, dried, and then pulverized into approximately 2 cm squares and mixed.

Approximately 300 g of the obtained crushed / mixed product is heavy oil
Pour into a 2.5 l stainless steel reaction vessel together with 600 g
The mixture was stirred at a temperature of 0 ° C. for 3 hours to perform a dechlorination treatment. heating·
Hydrogen chloride generated during the stirring was trapped in a water bath, and titrated with a 2N-NaOH standard aqueous solution using phenolphthalein as an indicator. As a result, the amount of generated hydrochloric acid was 6.3 g.

Further, about 2 g of the processed product in the reaction vessel was sampled and analyzed by an ion chromatograph. As a result, the residual chlorine amount in the processed product at the time when the dechlorination operation was completed was 0.056% by weight. Subsequently, after the dechlorination was completed, 15 g of iron oxide (commercial product, Fe ₂ O ₃ ) was added at a temperature of 320 ° C.
After heating and melting for hours, vacuum distillation is performed to
0 g was recovered.

Thereafter, the reaction vessel was cooled and a solid was taken out. Approximately 2 g of the solids taken out were sampled, and the content of chlorine was measured with an ion chromatograph. The remaining 300 g was crushed and classified as described above,
The passing sieve diameter [: D (80)] was calculated.

The results obtained are shown in Table 1 together with the processing conditions. (Example 4) In Example 2, iron oxide (commercial product, Fe ₂ O
₃ ) The same operation as in Example 2 was performed except that 8 g and 7 g of iron powder (manufactured by Kanto Kagaku, POWDER) were used. Table 1 shows the obtained results together with the processing conditions.

(Example 5) In Example 2, 8 g of iron oxide (commercially available, Fe ₂ O ₃ ) and iron hydroxide (manufactured by Kanto Chemical Co., Ltd.)
The same operation as in Example 2 was performed except that 7 g of Fe (OH) ₂ ) was used. Table 1 shows the obtained results together with the processing conditions. (Example 6) In Example 2, iron powder (manufactured by Kanto Chemical Co., Ltd., PO
WDER) 8 g and iron hydroxide (Kanto Chemical, Fe (OH) ₂ ) 7
The same operation as in Example 2 was performed except that g was used.

Table 1 shows the obtained results together with the processing conditions. (Example 7) The same operation as in Example 3 was performed, except that iron ore crushed was used instead of iron oxide. Table 1 shows the obtained results together with the processing conditions.

Example 8 The same operation as in Example 3 was performed, except that iron powder (POWDER, manufactured by Kanto Chemical Co.) was used instead of iron oxide. Table 1 shows the obtained results together with the processing conditions. Example 9 The same operation as in Example 3 was performed, except that iron hydroxide (manufactured by Kanto Chemical Co., Fe (OH) ₂ ) was used instead of iron oxide.

Table 1 shows the obtained results together with the processing conditions. Example 10 The same operation as in Example 3 was performed, except that the dechlorination reaction was performed at 180 ° C. Table 1 shows the obtained results together with the processing conditions.

Example 11 The same operation as in Example 3 was performed, except that the dechlorination reaction was performed at 320 ° C. for 30 minutes. Table 1 shows the obtained results together with the processing conditions. Comparative Example 1 The same operation as in Example 3 was performed except that iron oxide was added from the beginning.

Table 1 shows the obtained results together with the processing conditions. (Comparative Example 2) The same operation as in Example 3 was carried out except that iron oxide was not added. Table 1 shows the obtained results together with the processing conditions.

As shown in Table 1, the processed products of the chlorine-containing plastics obtained by the methods of Examples 1 to 11 all had a small amount of residual chlorine and had excellent pulverizability.
On the other hand, in Comparative Example 1 in which the iron-based additive was added from the beginning before dechlorination, the amount of residual chlorine in the obtained solid was large, and in Comparative Example 2 in which the iron-based additive was not added, The pulverizability of the obtained solid was inferior.

(Example 12) Chlorine-containing plastics were treated in the same manner as in Examples 1, 2, and 3 using a large-sized reaction vessel to obtain three kinds of solids, which were pulverized. Next, 3
Each type of crushed product was used as a reducing agent for iron ore or a solid fuel for combustion in blast furnaces, boilers, kilns and cupolas.

As a result, the solid pulverized product obtained by treating the chlorine-containing plastic obtained in the present invention could be blown into the raceway of the blast furnace and used as a reducing agent for iron ore. Further, it can be used as a solid fuel for combustion in boilers, kilns and cupolas, and has excellent flammability.

[0062]

[Table 1]

[0063]

Industrial Applicability According to the present invention, a plastic treatment which uses chlorine-containing plastics such as waste plastics as a raw material and can be effectively used as a solid fuel or an ore reducing agent having a small amount of residual chlorine and excellent crushability. Things can be obtained.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C21B 5/00 319 C21B 5/00 319 (72) Inventor Tatsuya Shinzawa 1 Kawasakicho, Chuo-ku, Chiba-shi, Chiba Address: Kawasaki Steel Engineering Co., Ltd. No. 1 Kawasaki Steel Corporation Chiba Works (72) Inventor Kazuya Miyagawa 1 Kawasaki-cho Chuo-ku, Chiba City Chiba Prefecture Kawasaki Steel Corporation Chiba Works (72) Inventor Hideaki Unzaki Chiba Central Chiba 1F Kawasaki-cho, Ward F-term in Kawasaki Steel Corporation Chiba Works (reference) 4F301 AA17 CA09 CA23 CA25 CA41 4H015 AA02 AA17 AB01 BA08 BA12 BB02 BB03 CA03 C B01 4K012 BA04 BD07 BD09 BE01 BE05

Claims (4)

[Claims] Claims 1. A chlorine-containing plastic is heated and dechlorinated by heating, followed by addition of one or more selected from iron, iron oxide and iron hydroxide, followed by heat treatment, cooling, A plastic processing method characterized by solidifying. 2. A solid fuel which is a processed plastic obtained by the method for processing plastic according to claim 1. 3. A reducing agent for ore, which is a processed plastic obtained by the method for processing plastic according to claim 1. 4. A method of processing plastics into a hardening furnace, wherein the processed plastics obtained by the method for processing plastics according to claim 1 is blown into a raceway of a hardening furnace for producing pig iron. How to blow.