JPH09239344A - Synthetic resins treatment and device therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To safely treat synthetic resins in large quantities by separating and removing chlorine containing high molecular resin materials from synthetic resins, feeding it into an incinerator to burn it, and taking out hydrogen chloride generated by the combustion to outside the roaster together with gaseous hydrochloric acid generated by thermal decomposition of hydrochloric acidbased waste liquid to recover it as hydrochloric acid. SOLUTION: Synthetic resins are fed into a furnace as fuels through a feeding means 10 after chlorine containing high molecular resin material is separated and removed from them by processing equipment 1. On the other hand, the chlorine containing high molecular resin material separated and removed is fed into an incinerator 3 of pickling waste water treating equipment 2 by a feeding means 11. Into the roaster 3, pickling waste water, fuel gas and oxygen containing gas are also fed through feeding means 6, 7, 8 respectively. By combustion of the fuel gas in the roaster 3, the pickling waste water is thermally decomposed into gaseous hydrochloric acid and iron chloride. After the gaseous hydrochloric acid is taken out from the incinerator top part and become rid of dust by a dust collector 4, it is sent to an absorber 5 and is recovered as a water solution of hydrochloric acid.

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 synthetic resins when using synthetic resins such as plastics as a fuel for furnaces, a reducing agent for iron sources, etc.

[0002]

2. Description of the Related Art In recent years, synthetic resins such as plastics have rapidly increased as industrial wastes and general wastes, and their disposal has become a major problem. Among these, plastics, which are high-molecular hydrocarbon compounds, generate a large amount of heat during combustion, and when incinerated, damage to the incinerator makes mass treatment difficult, and most of them are dumped in landfills. That is the current situation. However, dumping of plastics and the like is not preferable in terms of environmental measures, and in recent years, the shortage of land for landfill has become a social problem. For this reason, development of a method for mass processing of synthetic resins without dumping has been desired.

Against this background, a method of using synthetic resins such as plastics as an auxiliary fuel for a blast furnace or a reducing agent for an iron source is disclosed in EP-A-0 622 465 A1.
And JP-B-51-33493.
In these methods, a synthetic resin pulverized product is blown into a blast furnace through a tuyere or the like.
The conditions of 10 to 10 mm and bulk density of 0.35 or more are shown.

[0004]

However, it is said that chlorine-containing polymer resins such as vinyl chloride resins are contained in the synthetic resins as wastes in an amount of about 15% on average. When synthetic resins are supplied to a blast furnace, etc., a large amount of harmful gas (HC
1) occurs, causing significant environmental pollution. In addition, even if only the chlorine-containing polymer resin is separated and removed from the synthetic resins in advance in order to prevent the generation of such harmful gas, how to treat the separated and removed chlorine-containing polymer resin is described. The problem remains. Therefore, how to treat the chlorine-containing polymer resin contained in the waste synthetic resins is an important factor in determining the success or failure of large-scale treatment by converting the synthetic resins into a fuel or the like.

On the other hand, as a result of repeated experiments and investigations by the present inventors, synthetic resins such as plastic (hereinafter, "plastic" will be described as an example) are used to reduce the fuel injected into a furnace such as a blast furnace and the reduction of iron sources. When used as an agent, the following problems were found to be solved. When plastics discarded as industrial waste or general waste are classified by form, they are roughly divided into bulk plastics such as plate materials and film-like plastics. Occupy the amount. However, it has been found that the pulverized product of the film-like plastic has extremely poor transportability and fluidity, and has a great problem in handling properties when used as a fuel. That is, when plastic is blown into a blast furnace, a method of cutting out the plastic stored in a storage silo or the like and pneumatically supplying the plastic to the blast furnace is adopted. The crushed material easily forms a bridge (shelf hanging) in the storage silo, which makes it difficult to quantitatively cut out the crushed plastic material from the storage silo. It has been found that there is a problem that clogging occurs in the pipe (especially around the curved pipe portion and the valve) and troubles such as inability to supply air to the blast furnace occur.

[0006] Film plastics account for a considerable proportion of the total waste plastics. Therefore, while ensuring sufficient operability of a furnace such as a blast furnace, waste plastics can be injected into the furnace or reduced by an iron source. It is considered that solving the above-mentioned problems is indispensable for large-scale use. In order to inject plastic into the furnace, it is necessary to use plastic that has been pulverized in order to ensure flammability, etc. As shown in FIG.
However, crushed bulk plastics having such a particle size may not have sufficient flammability in the furnace,
For this reason, unburned plastic may fuse in the bed coke, significantly impairing the air permeability in the furnace, and hinder the operation of the furnace.

[0007] Further, since the lump of the bulk plastic has an irregular and square shape, it is 1-10.
With a particle size of about mm, the dischargeability when cutting out from the storage silo, the fluidity when transporting to the furnace, and the transportability are poor, and it is easy to cause clogging in the cutout part of the silo and the middle of the pneumatic piping system It turned out that there was also a problem. Therefore, as described in the prior art, simply grinding plastic into a particle size of about 1 to 10 mm, processing it into granular material having high density, and blowing this into a furnace solves the above-mentioned troubles. May cause.

Accordingly, an object of the present invention is to solve such a problem of the prior art, and to reduce synthetic resins such as plastics as waste without causing problems due to chlorine-containing polymer resins such as vinyl chloride resins. It is an object of the present invention to provide a method for treating synthetic resins which can be treated in a large amount as a reducing agent for a fuel or an iron source. Another object of the present invention is to supply synthetic resins such as waste plastics to furnaces such as blast furnaces regardless of the form, etc. and without causing problems due to chlorine-containing polymer resins such as vinyl chloride. It is an object of the present invention to provide a method for treating synthetic resins. Still another object of the present invention is to provide a method for treating synthetic resins which can effectively improve the transportability and combustibility of the synthetic resins supplied to a furnace. Still another object of the present invention is to provide equipment suitable for treating such synthetic resins.

[0009]

In order to solve such a problem, the present inventors previously prepared a chlorine-containing polymer resin material from waste synthetic resins to be supplied to a furnace as a reducing agent for a fuel or an iron source. As a treatment facility for the chlorine-containing polymer resin material thus separated and removed, a hydrochloric acid recovery facility for treating hydrochloric acid waste liquid to recover hydrochloric acid, especially steelmaking Attention was paid to the treatment equipment (hydrochloric acid recovery equipment) of the pickling waste liquid discharged from the existing steel material pickling equipment, and the idea was to use a chlorine-containing polymer resin as fuel for such hydrochloric acid recovery equipment.

For example, pickling equipment at an iron mill is taken as an example,
This equipment is mainly intended to dissolve and remove the scale (oxide film) generated on the surface of hot-rolled steel in the hot-rolling process of steel with hydrochloric acid solution, and contains iron chloride discharged from this pickling equipment. The pickling waste liquid (hydrochloric acid waste liquid) is sent to a waste liquid treatment facility and is thermally decomposed in a roasting furnace heated to a high temperature by a combustion burner, and hydrochloric acid and a by-product iron oxide are simultaneously recovered. The pickling waste liquid treatment facility for treating such chlorine-containing substances (hydrochloric acid waste liquid) and requiring a fuel for thermally decomposing the waste liquid has a condition that synthetic resins can be used as fuel and a chlorine-containing polymer resin. It also has the condition that hydrogen chloride generated by the combustion of can be reliably treated, and therefore by using this equipment, it is possible to use the chlorine-containing polymer resin as a fuel without any concern about the problem of the generation of harmful gas. In addition, the chlorine content of the chlorine-containing polymer resin can be recovered as hydrochloric acid without any special treatment. Based on such an idea, the present inventors
The present invention is to devise a completely new method for treating synthetic resins, which utilizes hydrochloric acid recovery equipment such as the above-mentioned pickling waste liquid treatment equipment for treating chlorine-containing polymer resin materials.

Further, the inventors of the present invention further studied based on the above finding that the presence of the film-like synthetic resin material in the waste synthetic resins hinders the use of the synthetic resins as a reactor fuel or the like. As a result, the synthetic resins are received in the respective processing lines in the state of being separated into the synthetic resins mainly composed of the film-shaped synthetic resin material and the other synthetic resin materials, and these are processed into granules in different steps. It is possible to obtain the optimum solid fuel or reducing agent for furnace blowing by processing, and especially for film-like synthetic resin material, when it is processed by a specific method, fluidity, transportability and flammability It is possible to obtain an extremely excellent granular synthetic resin material, and by mixing such a granular synthetic resin material with a pulverized product such as a massive synthetic resin material, the flow of the synthetic resin material as a whole is improved. , It found that can significantly enhance the transportability and combustion properties like was invented a method of processing synthetic resins based on these findings.

Further, from the viewpoint of ensuring a high degree of dischargeability of the granular synthetic resin material from the storage silo and transportability in the pneumatic tube, the present inventors set the angle of repose of the granular synthetic resin material within a specific numerical range. It was found that it was necessary to do so, and based on such findings, a more preferable method for treating synthetic resins was created. That is, the features of the present invention are as follows.

(1) A method for processing synthetic resin into a shape suitable for feeding into a furnace in a processing facility and then supplying the same as a fuel to the furnace. After substantially separating and removing the chlorine-containing polymer resin material, while supplying the synthetic resins to the furnace,
The chlorine-containing polymer resin material that has been separated and removed is supplied to a roasting furnace in a hydrochloric acid recovery facility for recovering hydrochloric acid by thermally decomposing a hydrochloric acid-based waste liquid in the roasting furnace and burned. A method for treating synthetic resins, characterized in that the generated hydrogen chloride is taken out of the furnace together with the hydrochloric acid gas generated by the thermal decomposition of the hydrochloric acid waste liquid and recovered as hydrochloric acid.

(2) Synthetic resins (A) mainly composed of a film-shaped synthetic resin material, and other synthetic resins
Each processing line X in the state separated into (B)
And a step of receiving into the processing line Y, a step of substantially separating and removing the chlorine-containing polymer resin material from the synthetic resins (A) and (B) in the processing line X and the processing line Y, and Before and / or after the step, the synthetic resins (A) and (B) are mixed with granular synthetic resin materials (a) and (b).
And the granular synthetic resin material
For supplying (a) and (b) to the furnace as fuel, and for recovering hydrochloric acid by thermally decomposing the separated chlorine-containing polymer resin material in a hydrochloric acid waste liquid in a roasting furnace. Supply to the roasting furnace in the hydrochloric acid recovery equipment of the above and burn it, and take out the hydrogen chloride generated by the combustion with the hydrochloric acid gas generated by the thermal decomposition of the hydrochloric acid waste liquid to the outside of the furnace and recover it as hydrochloric acid. A characteristic method for treating synthetic resins.

(3) Synthetic resins are synthetic resins (A) mainly composed of a film-shaped synthetic resin material and other synthetic resins
Each processing line X in the state separated into (B)
And a step of receiving in the processing line Y, a step of substantially separating and removing the chlorine-containing polymer resin material from the synthetic resin (A) in the processing line X, and a synthetic resin (A) after the step Granular synthetic resin material whose volume is solidified by melting or semi-moltening by heat and then solidifying
In the step (a), and in the processing line Y, the synthetic resin (B) is crushed to form a granular synthetic resin material.
the step of processing into (b) and the step of substantially separating and removing the chlorine-containing polymer resin material after the crushing treatment or in the middle of a plurality of crushing treatment steps, and the granular synthetic resin materials (a) and (b) Is supplied to the furnace as fuel or the like, and the chlorine-containing polymer resin material separated and removed is roasted in a hydrochloric acid recovery facility for thermally decomposing hydrochloric acid waste liquid in a roasting furnace to recover hydrochloric acid. A synthetic resin characterized by comprising: a step of supplying the mixture to a furnace and burning it, taking out hydrogen chloride generated by the combustion together with hydrochloric acid gas generated by thermal decomposition of a hydrochloric acid waste liquid to the outside of the furnace, and collecting it as hydrochloric acid. Processing method.

(4) Treatment of synthetic resins according to any one of the treatment methods (1) to (3), characterized in that the treated synthetic resins are supplied to a furnace as a reducing agent of an iron source. Method. (5) In the treatment method according to any one of (1) to (4) above, a hydrochloric acid recovery facility is attached to the steel material pickling facility, and the pickling waste liquid of the steel material is pyrolyzed in a roasting furnace to generate hydrochloric acid. A method for treating synthetic resins, which is a pickling waste liquid treatment facility for recovering the above. (6) In the treatment method according to any one of (2) to (5) above, the granular synthetic resin materials (a) and (b) are pneumatically fed into a furnace and blown into the furnace. Processing method. (7) In the treatment method according to any one of (2) to (6) above, the step of processing the synthetic resin (A) into a granular synthetic resin material (a) comprises:
At least, a step of heating and melting the synthetic resin (A) and then cooling and solidifying it, and a step of cutting or crushing the solidified synthetic resin material to obtain a granular synthetic resin material (a) A method for treating synthetic resins, comprising:

(8) In the treatment method according to any one of (2) to (6) above, at least the step of processing the synthetic resin (A) into the granular synthetic resin material (a) is at least the synthetic resin (A). A step of cutting or crushing, a step of semi-melting the cut or crushed synthetic resin material by heating or frictional heat due to the cutting or crushing, and shrinking the semi-molten synthetic resin material into particles by quenching Solidified granular synthetic resin material (a)
A method for treating synthetic resins. (9) In the treatment method according to any one of (2) to (6) above, the step of processing the synthetic resin (A) into a granular synthetic resin material (a),
At least a step of cutting or crushing the synthetic resin (A), a step of semi-melting the cut or crushed synthetic resin material by heating or frictional heat due to the cutting or crushing, and a semi-molten synthetic resin material A method for treating synthetic resins, which comprises a step of shrinking and solidifying by rapidly cooling the mixture, and a step of pulverizing the shrinking and solidifying synthetic resin material to obtain a granular synthetic resin material (a).

(10) In the processing method according to any one of (2) to (6) above, in the step of processing the synthetic resin (A) into the granular synthetic resin material (a), the synthetic resin (A) is processed at high speed. While cutting or crushing with a rotating rotary blade, the synthetic resin material is semi-melted by the frictional heat due to the cutting or crushing, and then the semi-molten synthetic resin material is rapidly cooled to shrink and solidify into granules for granular synthesis. A method for treating synthetic resins, characterized in that a resin material (a) is obtained. (11) In the processing method according to any one of (2) to (6) above, in the step of processing the synthetic resin (A) into the granular synthetic resin material (a), the synthetic resin (A) is rotated at a high speed. Along with cutting or crushing with a blade, the synthetic resin material is semi-moltened by frictional heat due to the cutting or crushing, and then the semi-molten synthetic resin material is rapidly cooled to shrink and solidify, and at the same time as the shrinking and solidifying, A method for treating synthetic resins, which comprises pulverizing with a rotary blade to obtain a granular synthetic resin material (a).

(12) In the treatment method according to any one of the above (2) to (11), the granular synthetic resin materials (a) and (b) are mixed at least immediately before the blowing into the furnace, and this mixture is placed in the furnace. A method for treating synthetic resins, characterized in that the synthetic resin is blown into. (13) In the processing method according to any one of (2) to (11) above,
A method for treating synthetic resins, characterized in that granular synthetic resin materials (a) and (b) are mixed, and the mixture is pneumatically fed into a furnace and blown into the furnace. (14) In the treatment method according to (12) or (13), the weight ratio of the granular synthetic resin materials (a) and (b) is (a) / [(a) +
(b)]: A method for treating synthetic resins, which comprises mixing at a ratio of 0.10 or more. (15) In the processing method according to any one of (2) to (14) above,
Synthetic resin materials (A) and (B) are processed in each of the processing lines X and Y at a bulk density of 0.30 or more and an angle of repose of 40.
A method for treating synthetic resins, characterized by processing into granular synthetic resin materials (a) and (b) of not more than °.

(16) A processing facility for performing a step of substantially separating and removing the chlorine-containing polymer resin material from the synthetic resin and a step of processing the synthetic resin into a shape suitable for feeding into the furnace, Supplying means for supplying the synthetic resin processed in the processing equipment to the furnace as fuel, and the chlorine-containing polymer resin material separated and removed in the processing equipment, the hydrochloric acid waste liquid in a roasting furnace. A treatment facility for synthetic resins, comprising a supply means for supplying as a fuel to a roasting furnace in a hydrochloric acid recovery facility for thermally decomposing hydrochloric acid.

(17) A step of receiving a synthetic resin (A) mainly composed of a film-like synthetic resin material, and substantially separating and removing the chlorine-containing polymer resin material from the synthetic resin (A), and a synthetic resin A processing line X in which a step of processing (A) into a granular synthetic resin material (a) is performed, and a synthetic resin (B) other than the synthetic resin (A) are received, and the synthetic resin (B) is received. Processing line Y in which the step of substantially separating and removing the chlorine-containing polymer resin material and the step of processing the synthetic resin (B) into the granular synthetic resin material (b) are performed, and the processing line X and Granular synthetic resin material (a) obtained in the processing line Y and
Supplying means for supplying (b) to the furnace as fuel or the like in a mixed state or without mixing, and the processing line X
And to supply the chlorine-containing polymer resin material separated and removed in the processing line Y as fuel to a roasting furnace in a hydrochloric acid recovery facility for thermally decomposing hydrochloric acid waste liquid in the roasting furnace to recover hydrochloric acid. And a means for supplying synthetic resin.

(18) A step of receiving a synthetic resin (A) mainly composed of a film-like synthetic resin material, and substantially separating and removing the chlorine-containing polymer resin material from the synthetic resin (A), and a synthetic resin A processing line X in which a step of processing (A) into a granular synthetic resin material (a) is performed, and a synthetic resin (B) other than the synthetic resin (A) are received, and the synthetic resin (B) is received. Processing line Y in which the step of substantially separating and removing the chlorine-containing polymer resin material and the step of processing the synthetic resin (B) into the granular synthetic resin material (b) are performed, and the processing line X and Granular synthetic resin material (a) obtained in the processing line Y and
Supplying means for supplying (b) to the furnace as fuel or the like in a mixed state or without mixing, and the processing line X
And to supply the chlorine-containing polymer resin material separated and removed in the processing line as fuel to a roasting furnace in a hydrochloric acid recovery facility for thermally decomposing hydrochloric acid waste liquid in the roasting furnace to recover hydrochloric acid. And a separator for separating and removing the chlorine-containing polymer resin material from the synthetic resin (A) at least from the inlet side, and the processing line X is separated and removed from the inlet side. The synthetic resin (A) is melted or semi-molten by heat and then solidified to process the volume-solidified granular synthetic resin material (a) into a granular solidification device, and the processing line Y is at least a crushing device for crushing the synthetic resins (B) from the inlet side, and a sorting device for separating and removing foreign matters from the crushed synthetic resins (B). Granular synthesis of synthetic resins (B) from which foreign matter has been removed Together with a grinding apparatus for grinding processed fat material (b), synthetic resins in the inlet side or outlet side of the grinding apparatus (B) or the granular synthetic resin material (b)
A processing facility for synthetic resins, comprising a separation device for separating and removing the chlorine-containing polymer resin material from the product.

(19) In the treatment equipment according to any one of (16) to (18) above, a hydrochloric acid recovery equipment is attached to a steel material pickling equipment, and a steel material pickling waste liquid is thermally decomposed in a roasting furnace. A treatment facility for synthetic resins, which is a treatment facility for pickling waste liquid for recovering hydrochloric acid.

In the method for treating synthetic resins of the present invention, the chlorine-containing polymer resin material is separated and removed in advance from the synthetic resins supplied to the furnace as a reducing agent for fuel or iron source. In some cases, it may be difficult to completely separate and remove all of the chlorine-containing polymer resin from the synthetic resin, and therefore, the separation and removal of the chlorine-containing polymer resin material is substantially and within a separable limit. It should be done as much as possible. For the same reason, it does not prevent the resin material other than the chlorine-containing polymer resin from being mixed into the separated and removed chlorine-containing polymer resin material.

Further, processing equipment (processing line X,
(Including Y), the proportion of chlorine-containing polymer resin material in the synthetic resins supplied, and the processing of synthetic resins (A) mainly composed of film-like synthetic resin materials and other synthetic resins (B) Due to the nature of waste, the amount supplied to the treatment equipment may fluctuate to some extent over time, and when it is limited to a relatively short period (for example, several hours to several tens of hours), the chlorine-containing amount is high. There may be a case where only synthetic resins containing no molecular resin material are supplied, or a case where only one kind of synthetic resins (A) and (B) is supplied. In such a case, the chlorine-containing polymer resin material may not be supplied to the roasting furnace of the hydrochloric acid recovery equipment (eg, pickling waste liquid treatment equipment) temporarily, or may be treated and supplied to the furnace. Synthetic resins temporarily
Either (A) -granular synthetic resin material (a) or synthetic resin (B) -granular synthetic resin material (b) may be used, but the treatment method of the present invention includes such cases. It goes without saying that it is a waste.

Further, in the processing method of the above [6], pneumatically feeding the granular synthetic resin materials (a) and (b) to the furnace means that the granular synthetic resin materials (a) and (b) are separately pneumatically fed to the furnace. If you do
In the above sense, the granular synthetic resin material (a) or (b) is temporarily used.
In the case where only one of the above is temporarily sent to the furnace in the short-term sense, the case where only one of the granular synthetic resin materials (a) and (b) is temporarily sent to the furnace is included. There is.

[0027]

BEST MODE FOR CARRYING OUT THE INVENTION According to the method for treating synthetic resins of the present invention, synthetic resins to be supplied to a furnace as a reducing agent for a fuel or an iron source are processed in a processing facility into a shape suitable for feeding into the furnace. At this time, the chlorine-containing polymer resin material such as vinyl chloride and vinylidene chloride is separated and removed from the synthetic resins in the processing equipment, and the chlorine-containing polymer resin material thus separated and removed is treated with hydrochloric acid in the pickling waste liquid treatment equipment, etc. It is supplied as a fuel to a roasting furnace of a hydrochloric acid recovery facility for the purpose of recovering hydrochloric acid from the system waste liquid and burned in the furnace. As a result, hydrogen chloride generated by the combustion of the chlorine-containing polymer resin is taken out of the furnace together with hydrochloric acid gas generated by the thermal decomposition of the pickling waste liquid, and is recovered as hydrochloric acid. On the other hand, the chlorine-containing polymer resin material is separated and removed, and the synthetic resin processed into a shape suitable for supplying into the furnace, such as granules, is supplied to the furnace as a reducing agent for fuel and iron source.

In the following, the present invention will be described by taking as an example the case where a pickling waste liquid treatment facility is used as a hydrochloric acid recovery facility. FIG. 1 is a conceptual diagram showing an example of the constitution of a synthetic resin processing method and equipment according to the present invention. 1 is a processing processing equipment for synthetic resins, 2 is a pickling waste liquid of a steel sheet and recovers hydrochloric acid. It is a pickling waste liquid treatment facility. Synthetic resins to be supplied to the furnace were charged into the processing facility 1, where they were processed into a shape suitable for supplying into the furnace such as granules, and the chlorine-containing polymer resin material was substantially separated and removed. After that, it is conveyed and supplied as fuel or the like to the furnace through the supply means 10. Usually, synthetic resins are supplied as furnace fuel and burn in the furnace, but in a blast furnace or the like, they can also be supplied as a reducing agent of an iron source. The processed synthetic resins may be temporarily stored in the storage hopper 12 as shown in the figure while being conveyed by the supply means 10. Further, the processing step of the synthetic resins and the separation and removal step of the chlorine-containing polymer resin in the processing facility 1 are performed in a predetermined order according to the properties of the synthetic resins and the like.

The chlorine-containing polymer resin material separated and removed in the processing equipment 1 is supplied to the pickling waste liquid treatment equipment 2 by the supply means 11.
Are transported and supplied to. The supply means 11 is composed of a conveying means to the pickling waste liquid treatment facility 2, a blowing means to the roasting furnace 3 and the like. Among these, the conveying means is a continuous type (for example, a conveyer conveyor or a pneumatic pipe). Etc.) or batch type. If necessary, a processing device for chlorine-containing polymer resin material may be provided in the middle of the supply means 11 (including the case where it is provided in the pickling waste liquid treatment facility). The pickling waste liquid treatment facility 2 removes dust from the roasting furnace 3 for separating the pickling waste liquid into hydrochloric acid gas and iron oxide by a thermal decomposition reaction, and hydrochloric acid gas taken out from the top of the roasting furnace 3 ( It is composed of a dust remover 4 such as a cyclone for collecting iron oxide dust in hydrochloric acid gas), an absorption tower 5 for introducing the dust-free hydrochloric acid gas into a high-concentration hydrochloric acid aqueous solution, and the like. Further, 6 is a supply means for supplying the pickling waste liquid to the roasting furnace 3, and 7 is for supplying fuel gas or fuel oil (hereinafter, the case of using the fuel gas will be described as an example) to the roasting furnace 3. Is a supply means for supplying an oxygen-containing gas such as air to the roasting furnace 3,
Reference numeral 9 denotes a returning means for returning the dust collected by the dust remover 4 to the roasting furnace 3, and the supplying means 7 has a combustion burner (not shown) for blowing a fuel gas into the furnace. ing.

In such a pickling waste liquid treatment facility, the pickling waste liquid is treated as follows. That is, the pickling waste liquid (hydrochloric acid waste liquid) is supplied into the roasting furnace 3 through the supply means 6, and the fuel such as B gas (blast furnace gas) or M gas (blast furnace gas + coke oven gas) is supplied through the supply means 7. Gas and oxygen-containing gas (air, oxygen-enriched air, etc.) are supplied through the supply means 8, respectively. The inside of the roasting furnace 3 is heated to a high temperature (for example, about 700 to 800 ° C.) by the combustion of the fuel gas, and the pickling waste liquid is thermally decomposed into hydrochloric acid gas and iron oxide. The iron oxide produced by thermal decomposition is taken out of the furnace from the bottom of the furnace and is recovered as iron oxide suitable as a ferrite raw material. On the other hand, the hydrochloric acid gas is taken out of the furnace from the top of the furnace, dedusted by the dust remover 4, and then sent to the absorption tower 5 to be recovered as a high-concentration hydrochloric acid aqueous solution. Further, the iron oxide dust collected by the dust remover 4 is returned to the roasting furnace 3 through the returning means 9.
Will be returned to

In the method of the present invention, the chlorine-containing polymer resin material separated and removed in the processing equipment 1 is supplied as a fuel to the roasting furnace 3 of such pickling waste liquid processing equipment and burned in the furnace. Hydrogen chloride is generated by the combustion of the chlorine-containing polymer resin supplied to the roasting furnace 3. The hydrogen chloride is taken out of the furnace together with the hydrochloric acid gas generated by the thermal decomposition of the pickling waste liquid, and as described above. And is recovered as an aqueous hydrochloric acid solution in the absorption tower 5. Therefore, a chlorine-containing polymer resin material can be used as a fuel without any concern about the problem of generation of hydrogen chloride gas, and synthetic resins are B gas conventionally used as a fuel for a roasting furnace. Since the amount of heat is considerably higher than that of M gas and M gas, the fuel cost in the roasting furnace can be significantly reduced. Although the chlorine-containing polymer resin material is supplied into the furnace as a part of the fuel in the configuration example of FIG. 1, most or all of the fuel may be the chlorine-containing polymer resin material in some cases.

Further, in the configuration example of FIG. 1, the chlorine-containing polymer resin material is supplied into the furnace by a dedicated supply means, but the method of supplying the chlorine-containing polymer resin material into the roasting furnace 3 is arbitrary. The following supply method can be adopted.
The following supply methods (1) to (4) can be similarly applied even when fuel oil is used instead of fuel gas. (1) The chlorine-containing polymer resin material is introduced into the fuel gas supply means 7, and the chlorine-containing polymer resin material is blown into the furnace through the combustion burner while being mixed with the fuel gas. (2) Using a combustion burner that can simultaneously inject fuel gas and synthetic resin material into the furnace, such as a multi-tube combustion burner,
The fuel gas and the chlorine-containing polymer resin material are supplied to the combustion burner by separate supply means, and both are simultaneously blown into the furnace from this combustion burner. (3) The chlorine-containing polymer resin material is introduced into the oxygen-containing gas supply means 8, and the chlorine-containing polymer resin material is blown into the furnace while being mixed with the oxygen-containing gas. (4) The chlorine-containing polymer resin material is mixed with the pickling waste liquid and is supplied into the furnace through the supply means 6 together with the pickling waste liquid.

FIG. 2 shows a more specific configuration example of the pickling waste liquid treatment facility and the method of the present invention using the same. The same devices as those in FIG. 1 are designated by the same reference numerals. In the figure, 1
3 is a concentrating tower for introducing the hydrochloric acid gas dedusted by the dust remover 4 and cooling it to condense the water into a high-concentration hydrochloric acid gas, and 14 is hydrochloric acid immediately before being introduced into the concentrating tower 13. Supply means for adding water to the gas, 15 supply means for supplying water to the absorption tower 5, 16 a hydrochloric acid recovery tank for recovering the hydrochloric acid aqueous solution taken out from the absorption tower 5, 1
Reference numeral 7 denotes an iron oxide recovery hopper for recovering the iron oxide taken out from the roasting furnace 3.

The pickling waste liquid before being supplied to the roasting furnace 3 is temporarily stored in the concentrating tower 13,
The hydrochloric acid gas to which water was added by the supply means 14 immediately before was cooled by contact with the added water and the pickling waste liquid in the tower, and the water content in the gas was condensed to increase the concentration. , Is guided outside the tower. Further, the added water and the water content in the condensed gas become a part of the pickling waste liquid in the concentrating tower 13, and the pickling waste liquid is supplied to the roasting furnace 3. The iron oxide produced in the roasting furnace 3 is taken out of the furnace from the bottom of the furnace and is recovered in the iron oxide recovery hopper 17, and the hydrochloric acid aqueous solution taken out from the absorption tower 5 is recovered in the hydrochloric acid recovery tank 16.

There is no special restriction on the type of the roasting furnace 3 of the hydrochloric acid recovery equipment used in the method of the present invention. 3 and 4 respectively show typical types of roasting furnaces in the pickling waste liquid treatment facility. Of these, FIG. 3 shows a fluidized bed type roasting furnace, a dispersion plate 18 for forming a fluidized bed is provided inside the roasting furnace 3, and a gas injection chamber 19 below the dispersion plate 18 is provided. An oxygen-containing gas such as air is supplied through the supply means 8, and the oxygen-containing gas flows into the reaction chamber 20 through a through hole (not shown) formed in the dispersion plate 18 to form a fluidized bed. A combustion burner 21 is provided on the dispersion plate 18, and combustion gas is supplied through the supply means 7. On the other hand, the pickling waste liquid and the chlorine-containing polymer resin material are directly supplied into the reaction chamber 20 through the supplying means 6 and the supplying means 11, respectively. The chlorine-containing polymer resin material is supplied to the supply means 6 or the supply means 7 and the combustion burner 21 as described above.
It may be supplied into the furnace through the above.

FIG. 4 shows a spraying type roasting furnace. A spray nozzle 22 for spraying the pickling waste liquid toward the lower part of the furnace is provided in the upper part of the roasting furnace 3, and this spray nozzle is used. 22 is supplied with the pickling waste liquid through the supply means 6, and the supply means 7 (combustion burner 23) is provided on the lower side of the furnace.
The fuel gas, the oxygen-containing gas and the chlorine-containing polymer resin material are respectively supplied through the supplying means 8 and the supplying means 11. Further, the type of the roasting furnace is not limited to the above, and any type such as a rotary kiln type roasting furnace can be adopted. In the method of the present invention, a part of the chlorine-containing polymer resin material supplied into the furnace may be gasified by thermal decomposition without being burned. The effect of the present invention is not impaired even if the gas is gasified by thermal decomposition without burning.

Next, FIG. 5 is a conceptual diagram showing another structural example of the method for treating synthetic resins and equipment according to the present invention. In this processing method, the synthetic resins to be supplied to the furnace are film-like synthetic resins. Accepted into each processing line in a state where they are separated into synthetic resins (A) mainly composed of materials and synthetic resins (B) other than that (that is, mainly composed of bulk synthetic resin material),
These are processed into granules in different steps. Here, the synthetic resin (A) may include, in addition to the film-like synthetic resin material, another form of synthetic resin material having difficulty in fluidity and transportability, such as foamed plastic.

Further, although there is no particular limitation on the film-like synthetic resin material, it was confirmed by experiments by the present inventors that a synthetic resin film having a thickness of 100 μm or less is particularly inferior in fluidity and transportability. Therefore, it is preferable to separate the synthetic resin film having a thickness of 100 μm or less into the synthetic resins (A) as far as it can be separated. However, needless to say, it is not necessarily limited to such a classification standard, and in addition to ultra-thin materials such as polyethylene film, relatively thick synthetic resins such as those used for so-called PET bottles are also available. It can be included in the synthetic resins (A). On the other hand, as the synthetic resin (B), a bulk synthetic resin material such as a plate material is mainly used, but it is needless to say that the synthetic resin (B) is not limited to this.

The point is that in consideration of the fluidity and transportability of the collected synthetic resins, synthetic resins (A ), And those such as bulk plastics that have better fluidity and transportability than that are sorted into synthetic resins (B), and other than that, synthetic resin in consideration of fluidity and transportability, etc. It may be classified into either of the types (A) and (B). When viewed as a whole processing system, of the synthetic resins to be supplied to the furnace, all of the film-like synthetic resin materials are to be synthetic resin (A), and all of the bulk synthetic resin materials are to be synthetic resin. (B) does not necessarily need to be strictly separated, and such strict separation is actually difficult in view of the nature of waste. Therefore, it is permissible that the synthetic resin (A) contains the bulk synthetic resin material and the like and the synthetic resin (B) contains the film-like synthetic resin material and the like to some extent.

In FIG. 5, X is a processing line for synthetic resins (A) mainly composed of film-like synthetic resin material, and Y is processing processing for synthetic resins (B) mainly composed of bulk synthetic resin material. Each line is shown. Each processing line X
In Y and Y, the step of separating and removing the chlorine-containing polymer resin material from the synthetic resins (A) and (B), and the synthetic resins (A) and (B) in the granular synthetic resin material (a) and the granular synthetic resin, respectively. The step of processing the material (b) is performed, and the granular synthetic resin material (a) and the granular synthetic resin material (b) are conveyed and supplied to the furnace such as a blast furnace through the supply means 10a, 10b, 10.

Granular synthetic resin material (a) and granular synthetic resin material (b)
The method of supplying to the furnace is arbitrary, and for example, as shown in the figure, after being stored and mixed in the storage hopper 12 in the middle of the supply means 10 and then supplied to the furnace and blown, without storing in the storage hopper. After mixing both in the middle of the supply means 10, a method of supplying and blowing into the furnace, a method of separately supplying each into the furnace and mixing immediately before blowing, a method of separately supplying each and blowing into the furnace, etc. The method of can be adopted.

Further, as described above, the step of granulating the synthetic resin and the step of separating and removing the chlorine-containing polymer resin material in each processing line are predetermined depending on the properties of the synthetic resin. Done in order. The chlorine-containing polymer resin material separated and removed in each processing line X, Y is supplied by a supply means 11a,
After being sent to the pickling waste liquid treatment facility 2 through 11b and 11 and supplied to the roasting furnace 3 as fuel and burning in the roasting furnace 3,
It is recovered as hydrochloric acid as described above. The above-mentioned supply means 11a, 11b, 11 are also composed of a conveying means to the pickling waste liquid treatment facility 2, a blowing means to the roasting furnace 3 and the like,
Of these, the conveying means may be either a continuous type (for example, a conveyer conveyor or a pneumatic tube) or a batch type. Further, if necessary, a processing device for the chlorine-containing polymer resin material may be provided with a supply means 11
It may be provided in the middle of a, 11b, 11 (including the case where it is provided in the pickling waste liquid treatment facility).

FIG. 6 shows a more specific structural example of the processing method and equipment of the system shown in FIG. 5. In the processing line X, the synthetic resins (A) are melted or semi-melted by heat. Volume solidification (volume reduction =
(Reduced in volume) processed into a granular synthetic resin material (a), while
In the processing line Y, the synthetic resin (B) is crushed and processed into a granular synthetic resin material (b). In processing line X,
The synthetic resins (A) are crushed (or coarsely crushed) in the crushing device 24 as needed, and then loaded into the separating device 25 by conveyor conveyance or the like, and the synthetic resins (A) are mixed with vinyl chloride or vinylidene chloride. Only the chlorine-containing polymer resin material is removed.

Since a chlorine-containing polymer resin such as vinyl chloride has a larger specific gravity than other synthetic resins (specific gravity of polyethylene: 0.91 to 0.96, specific gravity of polypropylene: 0.
The specific gravity of vinyl chloride is about 1.16 to 1.55, whereas the separator 25 is usually synthesized by a specific gravity separation method using a liquid such as water or a centrifugal separation method. The chlorine-containing polymer resin material is separated from the resins (A). Further, the iron scraps mixed in the synthetic resins are removed by the magnetic separator 26 during the conveyer or the like.
When the synthetic resin (A) is crushed by the granular solidifying device 27 described later, the crushing process by the crushing device 24 is not always necessary, and in that case, the crushing device 24 may not be provided. Good.

FIG. 7 shows an example of the constitution of the separation device 25 of the specific gravity separation system. Synthetic resins (A) are charged in a separation tank 41 containing water, and vinyl chloride, etc. which settle in the tank. The chlorine-containing polymer resin material and the other synthetic resin material that floats are separated. The chlorine-containing polymer resin material separated by settling is discharged to the outside of the tank by an appropriate discharging means, and the screen 42a
After being separated from water, it is discharged to the outside of the system. On the other hand, the synthetic resin materials other than the chlorine-containing polymer resin material floating in the tank are discharged outside the tank by an appropriate discharging means, separated from the water through the screen 42b, and then dried by the dryer 43, and the next step Sent to. In FIG. 7, 44 is a screen 4
It is a drainage tank for discharging the water separated in 2a and 42b.

FIG. 8 shows an example of the configuration of the separation device 25 of the centrifugal separation system. This device includes a main body 45 having a hollow inside or a spindle shape, an inner cylindrical body 46 with a screw arranged rotatably in the longitudinal direction inside the main body 45, and a motor for rotationally driving the inner cylindrical body. It is composed of 47 etc. In this device, a mixture of a synthetic resin material and a medium such as water is supplied from one end of the inner cylinder 46 that rotates at a high speed to the inside thereof. The mixture is discharged into the inner space of the main body 45 by the action of centrifugal force from an opening 48 provided in the longitudinal center of the inner cylindrical body 46, and a heavy component (chlorine-containing substance) having a larger specific gravity than the specific gravity of the medium is used as a boundary. Polymer resin) and light components with a small specific gravity (synthetic resin materials other than chlorine-containing polymer resin materials)
And separated. That is, as a result of the centrifugal force, only the heavy component of the synthetic resin material is collected on the inner wall surface side of the main body 45, so that the light component and the heavy component are separated in the radial direction of the main body 45.

Here, the inner cylinder 46 is provided with a screw 49a for conveying light components in the longitudinal half with the opening 48 as a boundary, and a screw 49b for conveying heavy components in the other half in the longitudinal direction. Has been. These screws 49a,
In 49b, the spiral directions of the screws are opposite to each other,
When the inner cylinder 46 rotates, the screws 49a, 4
9b conveys the synthetic resin material toward the end of the main body on each side. That is, the light synthetic resin material is conveyed to one end of the main body 45 by the screw 49a having relatively short blades, and is discharged from the discharge port 50a. On the other hand, the heavy synthetic resin material collected on the inner wall surface side of the main body 45 is screw 49b whose blades extend to the vicinity of the inner wall surface of the main body 45.
Is conveyed to the other end of the main body 45 by the discharge port 5
It is discharged from 0b. On the other hand, a medium such as water is discharged to the outside of the apparatus through a discharge port 51 provided in the substantially central portion of the main body 45. According to such an apparatus, the synthetic resin material separated into the heavy component (chlorine-containing polymer resin material) and the light component (synthetic resin material other than the chlorine-containing polymer resin material) is separated into very low moisture content. Can be discharged outside the apparatus.

The synthetic resins (A) from which the chlorine-containing polymer resin material has been separated and removed by the separating device 25 as described above are charged into the granular solidifying device 27, where the volume of the granular synthetic resin material is solidified.
(a). In the granular solidification device 27, for example, the volume reduction solidification-granulation treatment of the synthetic resin (A) is performed by any one of the following methods to obtain a granular synthetic resin material (a). Method of heating synthetic resin (A) to melt and then cooling to solidify, and cutting or crushing the solidified synthetic resin material. The synthetic resin (A) is cut or crushed (this cutting or crushing is The crushing device 2 is not in the granular solidification device 27.
4), the cut or crushed synthetic resin material is semi-moltened by heating or frictional heat due to the cut or crushed, and the semi-molten synthetic resin material is rapidly cooled to shrink and solidify, A method of obtaining a granular synthetic resin material (a) by shrinking and solidifying in a granular state or crushing a shrinking and solidifying synthetic resin material

In one embodiment of the above method, the synthetic resin (A) is cut or crushed by a rotating blade that rotates at a high speed, and the synthetic resin material is semi-melted by frictional heat generated by the cutting or crushing. The molten synthetic resin material is contracted and solidified by quenching it with water spray or the like.
At this time, a method of obtaining a granular synthetic resin material (a) by shrinking and solidifying into a granular form or simultaneously crushing with the rotary blade at the same time as the shrinking and solidifying, a typical example of these methods is a synthetic resin (A). ) Is completely melted, extruded into a linear shape or the like by an extruder, and then cut into granules to obtain a granular synthetic resin material (a), but various other processing methods are employed. be able to.

On the other hand, the method of is a synthetic resin
(A) is not completely melted, but is shrunk and solidified by quenching by a water spray or the like from a semi-molten state, and then is shrunk and solidified in a granular state, or the shrunk and solidified is pulverized into granules. This is a method for obtaining a granular synthetic resin material (a). The present inventors have particularly proposed such a granular synthetic resin material (a) obtained by the method (particularly the method).
However, not only the crushed product of the film-like synthetic resin material, but also the excellent fluidity and transportability even when compared with the crushed product of the lump-shaped synthetic resin material, and that it is also excellent in flammability. Furthermore, it has been found that the transportability and combustibility of the entire synthetic resin material can be remarkably improved by using them by mixing them with a pulverized product of a lumpy synthetic resin material, and therefore, as a fuel of the present invention. In the method, the synthetic resin (A) is used in the granular solidification device 27 by the above method or
Granular shrinkage solidification or shrinkage solidification-Perform granulation treatment,
Most preferably, the granular synthetic resin material (a) is obtained.

FIG. 9 shows an example of a structure for performing the granular shrinkage solidification or the continuous treatment of shrinkage solidification-granulation by the above-mentioned method. The synthetic resins loaded in the granular solidification device 27 are shown in FIG.
(A) is crushed by the crushing device 52, and then the volume reducing and solidifying device 53
Will be charged. In this volume reduction and solidification device 53, synthetic resins
(A) is continuously conveyed through the heating chamber 54 and the cooling chamber 55 subsequent thereto by a conveying device 56 (conveying belt or the like), and is heated in the heating chamber 54 (gas heating, gas indirect heating or electric heating)
After being semi-melted by being heated, it is rapidly cooled by water spray or the like in the cooling chamber 55 to shrink and solidify. At this time, synthetic resins (A)
The synthetic resin material can be contracted and solidified in a granular form by appropriately selecting the crushing form of No. 1, the charging state into the heating chamber, etc. Therefore, according to this method, the granular synthetic resin material (a) can be obtained by shrinking and solidifying as it is. To be

On the other hand, in the method in which part or all of the synthetic resin material is not shrunk and solidified into granules, the contracted and solidified synthetic resin material is loaded from the volume reduction solidification device 53 into the crushing device 57 and is granulated by the crushing device 57. The granular synthetic resin material (a) is obtained by crushing. Since the granular synthetic resin material (a) obtained as described above is obtained by shrinking and solidifying the crushed film-like synthetic resin material from a semi-molten state into granules or by shrinking and solidifying it, Compared to the crushed lump of synthetic resin material, it is relatively porous and has a large specific surface area.Moreover, it is not a square shape like the crushed lump of synthetic resin material, it is rounded as a whole Due to its shape, it exhibits excellent flammability and fluidity.

FIG. 10 schematically shows the principle of the granular shrinkage solidification or the shrinkage solidification-granulation treatment carried out by the above method, in which the synthetic resin (A) is cut by the rotary blade 58 rotating at a high speed or Along with crushing, the synthetic resin material is semi-moltened by frictional heat due to this cutting or crushing, and then this semi-molten synthetic resin material is rapidly cooled from the above temperature by water spray or the like to shrink and become individual. The particles are shrunk and solidified, or simultaneously shrunk and solidified, and pulverized by the rotary blade 58 to obtain a granular synthetic resin material (a). This method does all of the crushing (or cutting) processing of the synthetic resin material by the batch method, the semi-melting processing and the crushing processing after shrinkage solidification (however, crushing is not necessary when shrinking and solidifying into granules by rapid cooling). It is performed by the rotary blade 58 that rotates at high speed, and "crushing (or cutting) → semi-melting →
A series of processing steps of "granular shrinkage solidification by rapid cooling" or "crushing (or cutting) → semi-melting → shrinkage solidification by rapid cooling → crushing" are rapidly performed in a short time, and the synthetic resin material is crushed by the rotary blade 58 ( (Cutting) -Semi-melting during high-speed stirring and rapid quenching treatment from such a state provide a more preferable granular synthetic resin material (a) in terms of specific surface area and grain shape. Further, since the crushing (or cutting) treatment, the semi-melting treatment, and the crushing treatment after shrinkage and solidification are performed only by the action of the rotary blade 58, it is advantageous in terms of equipment cost and operating cost.

Also in the above method, the synthetic resin material can be shrunk and solidified into particles by appropriately selecting the crushing form of the synthetic resin (A), the charging state with respect to the rotary blade, and the like. According to the method, the granular synthetic resin material (a) can be obtained as shrink-solidified without substantially crushing treatment by the rotary blade after shrink-solidification. On the other hand, in the method in which part or all of the synthetic resin material is not shrunk and solidified in a granular form, the granular synthetic resin material (a)
Is obtained. In the above method, the temperature at which the synthetic resin (A) is semi-moltened varies to some extent depending on the type and shape of the synthetic resin, for example, in the case of low-density polyethylene in terms of material alone, about 105 to 115 ° C. It is around 128 ° C for medium-low density polyethylene. Therefore, the temperature for semi-melting is appropriately selected according to the type, proportion, form, and the like of the synthetic resin material contained in the synthetic resins (A).

Granular synthetic resin material obtained as described above
(a) is sieved by a sieving device 28, and only those having a predetermined particle size or less (for example, -6 mm) are sent to the storage silo 30 through a path 29 which is a supply means. In this configuration example, the path 29 is constituted by an air feeding pipe (in the figure, 31 is a blower), and the granular synthetic resin material (a) is air fed (air transportation, the same below) to the storage silo 30. On the other hand, the granular synthetic resin material having a particle size exceeding a predetermined value is returned to the transfer line on the inlet side of the separating device 25 or the granular solidifying device 26 through a path 32 (31 is a blower in the figure) which is an air feeding pipe, and synthetic resins ( It is reloaded into the separating device 25 or the granular solidifying device 26 together with A).

On the other hand, in the processing line Y, synthetic resins
(B) is roughly crushed in the primary crushing device 33 (for example, crushed to a particle size of about 50 mm) and then charged into the secondary crushing device 34 by conveyor conveyance or the like to be subjected to secondary crushing (for example, to a particle size of about 20 mm). Be crushed). The synthetic resin (B) that has been primary crushed, the magnetic separator 2
According to 6, the iron scraps mixed in are removed. The secondary crushed synthetic resins (B) are loaded into a sorting device 35 by conveyor transportation or the like, and foreign substances such as metal, earth and sand, stones, etc. are separated and removed by a method such as wind power sorting. Then route 38a
Is sent to the separating device 36 through and is separated and removed only from the chlorine-containing polymer resin material from the synthetic resins (B). The separation system and the configuration example of the separation device 36 are the same as those of the separation device 25 described above, and therefore the description thereof will be omitted. The separating device 36 may be arranged on the outlet side of the crushing device 37 described later.

The synthetic resins (B) from which the chlorine-containing polymer resin material has been separated and removed in the separating device 36 are sent to a crushing device 37 (tertiary crusher) through a path 38b and have a particle size of a predetermined value or less (for example, -6 mm). ) Is pulverized to obtain a granular synthetic resin material (b). This granular synthetic resin material (b) is sent to the storage silo 30 through the path 38c which is a supply means.
In this configuration example, the paths 38a to 38c are provided with pneumatic tubes (3 in the figure).
1 is a blower, and the granular synthetic resin material (b) is pneumatically sent to the storage silo 30. The mixture of the granular synthetic resin materials (a) and (b) stored in the storage silo 30 is transferred to the blowing means 39 by conveyor transportation, pneumatic feeding, or the like, and is pneumatically fed to the furnace such as a blast furnace through the blowing means 39. And blown into the furnace from the tuyere of the furnace.

On the other hand, the chlorine-containing polymer resin material separated by the separating device 25 and the separating device 36 is supplied by the supply means 40a, 40.
It is supplied as a fuel to the roasting furnace 3 of the pickling waste liquid treatment facility 2 through b and 40, and is recovered as hydrochloric acid through the above process. The supply means 40a, 40b, 40c
Is also composed of a conveying means to the pickling waste liquid treatment facility 2, a blowing means to the roasting furnace 3, and the like, and the conveying means may be either of a continuous type (for example, a conveyer or an air feeding pipe) or a batch type. Good. If necessary, a chlorine-containing synthetic resin material processing device or the like (for example, a device corresponding to the granular solidification device 27 of the processing line X or a crushing device 3 of the processing line Y).
7 or the like) and supply means 40a, 40b, 4
In the middle of 0c (including the case where it is installed in the pickling waste liquid treatment facility)
May be provided.

The embodiments of FIGS. 1 to 6 described above are examples in which the pickling waste liquid treatment facility in the steel mill is used as the hydrochloric acid recovery facility, but the method of the present invention uses the hydrochloric acid waste liquid in the roasting furnace. Any hydrochloric acid recovery equipment for thermally decomposing and recovering hydrochloric acid can be used regardless of its type. However, from the perspective of using only existing equipment within the integrated steelworks and consuming large amounts of synthetic resins as reducing agents for fuel and iron sources, it is recommended to use the above-mentioned pickling waste liquid treatment equipment. Most preferred.

As described above, the ratio of the chlorine-containing polymer resin material in the synthetic resins supplied to the processing equipment,
The amount of the synthetic resin (A) mainly composed of a film-like synthetic resin material and the other synthetic resin (B) supplied to the processing equipment may vary to some extent over time due to the nature of waste. Yes, for a relatively short period of time (e.g.
If only limited to synthetic resin containing no chlorine-containing polymer resin material,
It is also conceivable that only one of the synthetic resins (A) and (B) is supplied. In such a case, the chlorine-containing polymer resin material is not supplied at all to the roasting furnace 3 of the pickling waste liquid treatment facility, or the synthetic resins to be processed and supplied to the furnace are temporarily supplied. Synthetic resin (A) -granular synthetic resin material (a) or synthetic resin (B)
It may be either one of the granular synthetic resin materials (b). Further, for any other reason, it is possible that only one of the granular synthetic resin materials (a) and (b) is temporarily sent to the furnace by air. In the processing method of FIG. 6, the granular synthetic resin materials (a) and (b) are stored in separate silos,
It can also be pneumatically fed to the furnace via separate routes.
If the synthetic resin material that is waste consists essentially of chlorine-containing synthetic resin material, it is directly supplied to the roasting furnace of the hydrochloric acid recovery facility without going through the separation and removal process in the processing facility. be able to.

As described above, the granular synthetic resin material (a) obtained by the above-described method of granular shrinkage solidification or shrinkage solidification-granulation has a relatively porous property, a large specific surface area, and As shown in Fig. 2, it exhibits excellent flammability and fluidity due to its rounded shape. By mixing these with the granular synthetic resin material (b), the entire granular synthetic resin material supplied to the furnace is It is possible to effectively enhance the combustibility, fluidity and transportability of That is, regarding the flammability, when a mixture of the granular synthetic resin material (a) and the granular synthetic resin material (b) is blown into the furnace, the granular synthetic resin material (a) having good flammability rapidly burns. As a result, the granular synthetic resin material (b) is quickly ignited, thereby significantly increasing the flammability of the whole granular synthetic resin material blown into the furnace. Furthermore, with regard to fluidity and transportability, the granular synthetic resin material (a) having a rounded shape and excellent in fluidity and transportability is included in the granular synthetic resin material, and this is the entire granular synthetic resin material. Has a lubricating function to improve the fluidity of the granular synthetic resin material, and as a result, the fluidity and transportability of the whole granular synthetic resin material are greatly improved.

In order to obtain the above action, the weight ratio of the granular synthetic resin material (a) to the granular synthetic resin material (b) is (a) /
[(A) + (b)]: It is preferable to mix in a ratio of 0.10. FIG. 12 is obtained by crushing a granular synthetic resin material (a) having a particle diameter of 6 mm or less obtained by shrinking and solidifying-granulating the film-shaped synthetic resin material by the above method and pulverizing the synthetic resin material. A granular synthetic resin material (b) having a particle diameter of 6 mm or less (all the granular synthetic resin materials have an angle of repose of 40 °) is mixed at various ratios, and the mixture is pneumatically fed to the tuyere of the blast furnace. Internal injection is performed, and the weight ratio of (a) / [(a) + (b)] at that time and the transportability of the mixture (frequency of occurrence of supply trouble) and combustibility (coke replacement rate by injected fuel) It is a study of the relationship. The supply trouble occurrence frequency and the coke replacement ratio were determined as follows.

(A) Frequency of occurrence of supply trouble When only the granular synthetic resin material (b) (repose angle: 40 °) having a particle diameter of 6 mm or less obtained by pulverizing the massive synthetic resin material is supplied to the furnace alone. Supply trouble occurrence frequency index of "1"
The frequency of supply trouble occurrence compared to this case is indicated by an index. Whether there is a supply trouble or not is monitored by constantly monitoring the weight fluctuation of the granular synthetic resin material in the storage silo.
If the state of (1) lasts for a predetermined time (for example, about 10 minutes), it is determined that a trouble has occurred (clogging has occurred in the silo cutout portion or in the middle of the air supply pipe). (B) Coke substitution rate Coke substitution rate = (Coke ratio reduced by blowing granular synthetic resin material) / (Blow rate of granular synthetic resin material) However, Coke ratio reduced by blowing granular synthetic resin material: kg / T · pig Blow-in ratio of granular synthetic resin material: kg / t · pig According to FIG. 12, (a) / [(a) + (b)]: excellent flammability and transportability in the range of 0.10 or more It can be seen that

In order to control (a) / [(a) + (b)] within a predetermined range as described above, the granular synthetic resin material (a) and the granular synthetic resin material (b) are temporarily separated from each other. It is preferable to mix after storing in the storage silo. FIG. 11 shows a configuration example of a storage silo for that purpose. The granular synthetic resin material (a) and the granular synthetic resin material (b) are stored in the respective primary storage silos 59 and 60, and these primary storage silos 5 are stored.
9, 60 to the secondary storage silo 61 (storage silo 3 in FIG.
(Corresponding to 0) granular synthetic resin material (a) and granular synthetic resin material (b)
Are appropriately cut out, and (a) / [(a) + is added to the secondary storage silo 61.
(b)] The adjusted granular synthetic resin material is stored. Also,
In addition to the above configuration, for example, the primary storage silo 5
The granular synthetic resin material (a) and the granular synthetic resin material (b), which are respectively stored in Nos. 9 and 60, may be directly mixed in the pneumatic piping system.

Further, the granular synthetic resin materials (a) and (b) are preferably processed to have a bulk density of 0.30 or more and an angle of repose of 40 ° or less. As described above, in the prior art, it is proposed that the bulk density of the synthetic resin pulverized material is 0.35 or more. However, there is a problem that the load of the crushing blade is increased (the life of the crushing blade is shortened), and some crushers can only obtain a pulverized material having a bulk density of less than 0.35. On the other hand, according to the study of the present inventors, if the bulk density of the granular synthetic resin material is 0.30 or more, there is no problem in pneumatically feeding the granular synthetic resin material including the point of pressure loss and the like. In addition, the occurrence of troubles such as bridges (shelf hanging) in storage silos of granular synthetic resin materials and clogging around curved pipes and valves in the air supply pipe system is the bulk density of granular synthetic resin materials. It has been found that there is almost no relation, and the effect of suppressing the occurrence of the trouble based on the particle shape is largely determined by the angle of repose of the granular synthetic resin material.

FIG. 13 shows the angle of repose of a granular synthetic resin material having a particle size of 6 mm or less obtained by crushing a lumpy synthetic resin material, the bridge (shelf) in the storage silo, and the clogging in the pneumatic tube. The relationship between the occurrence frequency of supply troubles and the like is shown for each granular synthetic resin material having a different bulk density. The frequency of occurrence of supply trouble was evaluated in the same manner as in FIG. According to FIG. 13, regardless of the bulk density of the granular synthetic resin material, setting the angle of repose to 40 ° or less can appropriately prevent the above-mentioned supply trouble.

Of the granular synthetic resin material (a),
It can be seen that a granular synthetic resin material having an angle of repose of 40 ° or less can be obtained by simply performing the granular shrinkage-solidification or shrinkage-solidification-granulation by the method described above. Was. On the other hand, the granular synthetic resin material (a) obtained by volume reduction solidification-granulation by the above method
Alternatively, for the granular synthetic resin material (a) obtained by shrinking and solidifying and granulating by a method other than the above-mentioned method or the granular synthetic resin material (B) obtained by crushing the synthetic resins (B), the angle of repose is 40 The crushing method and the like are appropriately selected to achieve the following. The particle size of the granular synthetic resin materials (a) and (b) obtained by processing in the present invention is 10 mm from the viewpoint of flammability and the like.
Hereafter, it is preferably 4 to 8 mm. The method for treating synthetic resins of the present invention can be applied to various furnaces including a blast furnace, a scrap melting furnace, a rotary kiln and the like.

[0068]

EXAMPLE A synthetic resin mainly composed of a film-like synthetic resin material is used in the synthetic resin treatment facility of the present invention shown in FIG.
(A) is 1.60 t / hr, synthetic resin mainly composed of bulk synthetic resin material (B) is supplied at a ratio of 2.98 t / hr, and processed into granular synthetic resin materials (a) and (b). After treating and mixing them in the storage silo, they were pneumatically fed to the blast furnace through the pneumatic tube system and blown into the furnace from the tuyere together with the pulverized coal.
The chlorine-containing polymer resin material separated and removed in each processing line was transported and supplied to the existing pickling waste liquid treatment facility, and was blown into the furnace as fuel for the roasting furnace. The processing and supply conditions of the synthetic resin and the operating conditions of the blast furnace at this time are shown below.

(A) Processing conditions of synthetic resins (a-1) Synthetic resins (A) After coarse crushing and separation and removal of the chlorine-containing polymer resin material in the processing line X of FIG. Method of shrinkage solidification-granulation process to obtain a granular synthetic resin material having a particle size of 6 mm or less
(a) was processed and transferred to a storage silo. (B-2) Synthetic resins (B) In the processing line Y of FIG. 6, primary crushing, secondary crushing,
The chlorine-containing polymer resin material was separated and removed and pulverized to form a granular synthetic resin material (b) having a particle diameter of 6 mm or less, which was transferred to a storage silo. (B-3) Blasting of granular synthetic resin material into the blast furnace The mixture of granular synthetic resin materials (a) and (b) charged in the storage silo is quantitatively cut out from the silo and transferred to the pneumatic supply facility. Then, the granular synthetic resin material was pneumatically fed from the pneumatic feeding equipment to the tuyere of the blast furnace and blown into the furnace.

(A-4) Chlorine-containing polymer resin material The chlorine-containing polymer resin material separated and removed by each of the separation devices of the processing lines X and Y is used in the roasting furnace of the pickling waste liquid treatment facility in the ironworks ( It was conveyed and supplied to a roasting furnace of the type shown in FIG. 3 and was blown into the furnace as fuel. The operating conditions of the roasting furnace are shown below. Pickling waste supply rate: 4.4 m ³ / hr Fuel gas species: M gas (2500kcal / Nm ³⁾ fuel gas supply quantity: 1020 nm ³ / hr air supply: supply rate of 6230Nm ³ / hr chlorine-containing polymer resin (Average): About 410 kg /
hr Note that the standard operating conditions (operating conditions corresponding to the following conventional example) in the above pickling waste liquid treatment facility are: pickling waste liquid treatment amount: 3290 m ³ / month (HCl concentration in waste liquid: 3.8%,
Fe concentration: 8.5%), fuel gas supply: 1.4 million Nm
³ / month, air supply: 4.44 million Nm ³ / month, hydrochloric acid recovery:
3,164 m ³ / month (HCl concentration: 17.85%), iron oxide recovery: 480 t / month.

(B) Blast furnace operating conditions: Amount of tapping: 10000 t / day Coke ratio: 425 kg / t · pig Tuyere injection amount of granular synthetic resin material: 10 kg / t · pig Amount of pulverized coal injection: 80 kg / t · pig Air flow rate: 1020 Nm ³ / t · pig Oxygen enrichment rate: 4% Air flow temperature: 1150 ° C

As a result of treating the synthetic resins and supplying them to the blast furnace and the pickling waste liquid treatment equipment as described above, there is no problem in the operation itself of the blast furnace or the pickling waste liquid treatment equipment, and the supply to the blast furnace is completed. Almost no supply troubles such as clogging in the storage silo cutout portion of the granular synthetic resin material and the pneumatic tube system occurred. Further, in this example of operation, about 9% of the synthetic resins supplied to the processing lines X and Y were chlorine-containing polymer resin materials such as vinyl chloride resin. It was possible to separate and collect 99% with a separator. Therefore, even in the result of collecting the furnace top gas during the whole operation and analyzing the gas composition, almost no HCl was detected.

Further, since the chlorine-containing polymer resin material is supplied as fuel for the roasting furnace in the pickling waste liquid treatment facility, the amount of fuel gas used is greatly reduced and recovered as compared with the conventional operation. The amount of hydrochloric acid increased by about 150 kg / hr. In addition, the quality (chlorine content) of iron oxide recovered as a by-product was almost the same as the quality of iron oxide obtained by conventional operations. Below, the combustion gas supply amount, the recovered hydrochloric acid amount, and the chlorine content in iron oxide in this operation example (invention example) are shown in comparison with the case of a conventional operation example in which the same waste liquid treatment amount was used. . Inventive Example Conventional Example Combustion gas supply rate (kcal / hr) 2.48 × 10 ⁶ 4.93 × 10 ⁶ Chlorine content in iron oxide (ppm) 826 810

[0074]

As described above, according to the present invention, a synthetic resin such as plastic as a waste can be converted into a fuel for a furnace without worrying about the problem of generation of harmful gas due to combustion of a chlorine-containing polymer resin. It can be used as a reducing agent for iron and iron sources, and has the effect of enabling mass processing and effective utilization of synthetic resin waste. Moreover, according to the present invention, the chlorine contained in the chlorine-containing polymer resin can be effectively recovered as hydrochloric acid, and the fuel cost of the hydrochloric acid recovery facility can be significantly reduced. It is possible to obtain the excellent effect that the reduction and the economical large-scale treatment of the synthetic resins as the waste can be achieved at the same time.

Further, particularly, the treatment method and equipment according to claim 5 and claim 19 utilizing the pickling waste liquid treatment equipment as the hydrochloric acid recovery equipment is used in various furnaces such as blast furnaces and scrap melting furnaces installed in integrated steelworks. Also, since it is a synthetic resin treatment system that utilizes the pickling waste liquid treatment equipment that is also attached to the coil pickling equipment, it is possible to minimize the amount of new equipment investment and generate a large amount of waste synthetic resins. In addition, it is possible to consume efficiently, and in combination with the effect of significantly reducing raw material costs and fuel costs in steelworks such as blast furnaces, etc., the establishment of technology for processing waste of synthetic resins has been established. It can be said that the present invention is extremely useful in the long-awaited situation.

Further, according to the treatment method and equipment according to claim 2, claim 3, claim 17 and claim 18, which carries out the separation treatment of synthetic resins, regardless of the form, synthetic resins such as plastics are used. It can be used as a fuel injected into the furnace or as a reducing agent for iron sources. Therefore, it is possible to achieve large-scale processing and effective utilization of waste synthetic resins while ensuring sufficient operability of the furnace such as a blast furnace. . Furthermore, claim 7 to claim 1
According to the treatment method of No. 5, it is possible to effectively enhance the fluidity, the transportability and the combustibility of the synthetic resins supplied to the furnace, without impairing the operation of the furnace in the furnace such as a blast furnace. The synthetic resin material can be appropriately supplied into the furnace as a reducing agent for fuel or iron source.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing one configuration example of a processing method and equipment of the present invention.

FIG. 2 is an explanatory view showing more specifically one constitution example of the pickling waste liquid treatment facility and the method of the present invention using the same.

FIG. 3 is an explanatory diagram showing a configuration example of a roasting furnace of a hydrochloric acid recovery facility used by the present invention.

FIG. 4 is an explanatory view showing another configuration example of the roasting furnace of the hydrochloric acid recovery equipment used in the present invention.

FIG. 5 is an explanatory view showing another configuration example of the treatment method and equipment of the present invention.

6 is an explanatory diagram showing a more specific configuration example of the processing method and equipment of the system shown in FIG.

FIG. 7 is an explanatory diagram showing a configuration example of a chlorine-containing polymer resin material separating device.

FIG. 8 is an explanatory diagram showing another example of the configuration of the chlorine-containing polymer resin separating device.

FIG. 9 is an explanatory view showing one structural example of a method for shrink-solidifying-granulating a synthetic resin (A).

FIG. 10 is an explanatory view schematically showing the principle of another method for shrink-solidifying-granulating a synthetic resin (A).

11 is an explanatory diagram showing another configuration example of the storage method of the granular synthetic resin material in the configuration example of FIG.

FIG. 12: Granular synthetic resin material (a) obtained by shrink-solidifying-granulating a film-shaped synthetic resin material by a specific method and granular synthetic resin material (b) obtained by pulverizing massive synthetic resin material A graph showing the relationship between the mixing ratio with Coke substitution rate and the occurrence frequency of supply trouble

FIG. 13 is a graph showing the relationship between the angle of repose and the occurrence frequency of supply troubles for granular synthetic resin materials obtained by pulverizing massive synthetic resin materials for different granular synthetic resin materials having different bulk densities.

[Explanation of symbols]

1 ... Processing equipment, 2 ... Pickling waste liquid treatment equipment, 3 ... Roasting furnace, 4 ... Dust remover, 5 ... Absorption tower, 6, 7, 8 ... Supply means,
9 ... Returning means, 10a, 10b, 10, 11a, 11
b, 11 ... Supplying means, 12 ... Storage hopper, 13 ... Concentrating tower, 14, 15 ... Supplying means, 16 ... Hydrochloric acid recovery tank, 1
7 ... Iron oxide recovery hopper, 18 ... Dispersion plate, 19 ... Gas injection chamber, 20 ... Reaction chamber, 21 ... Combustion burner, 22 ... Spray nozzle, 23 ... Combustion burner, 24 ... Crushing device, 25 ... Separation device, 26 ... Magnetic separator, 27 ... Granular solidifying device, 28 ... Sieve device, 29 ... Path, 30 ... Storage hopper, 31 ... Blower, 32 ... Path, 33 ... Primary crushing device, 34 ... Secondary crushing device, 35 ... Sorting device, 36 ... Separation device, 37 ... Crushing device, 38a-38c ... Path, 39 ... Blowing means, 40
a, 40b, 40 ... Supplying means, 41 ... Separation tank, 42a,
42b ... Screen, 43 ... Dryer, 44 ... Drainage tank, 45 ... Main body, 46 ... Inner cylinder, 47 ... Motor, 48 ...
Openings, 49a, 49b ... Screws, 50a, 50b,
51 ... Discharge port, 52 ... Crushing device, 53 ... Volume reducing and solidifying device,
54 ... Heating chamber, 55 ... Cooling chamber, 56 ... Conveying device, 57 ...
Grinding device, 58 ... Rotary blade, 59, 60 ... Primary storage silo, 61 ... Secondary storage silo, X, Y ... Processing line

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tsutomu Shibata 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Japan Steel Tube Co., Ltd. (72) Tsuneo Nagaoka 1-2-1 Marunouchi, Chiyoda-ku, Tokyo Date Main Steel Pipe Co., Ltd.

Claims (19)

[Claims] 1. A method for processing a synthetic resin into a shape suitable for feeding into a furnace in a processing facility, and then supplying the synthetic resin to the furnace as a fuel or the like, wherein the synthetic resin is included in the processing facility. After substantially separating and removing the chlorine polymer resin material, the synthetic resins are supplied to the furnace, and the separated and removed chlorine-containing polymer resin material is thermally decomposed in a roasting furnace using a hydrochloric acid waste liquid. Then, it is supplied to a roasting furnace in a hydrochloric acid recovery facility for recovering hydrochloric acid and burned, and the hydrogen chloride generated by the combustion is taken out of the furnace together with the hydrochloric acid gas generated by the thermal decomposition of the hydrochloric acid waste liquid and recovered as hydrochloric acid. A method for treating synthetic resins, comprising: 2. Synthetic resins are mainly composed of a film-shaped synthetic resin material (A) and other synthetic resins (B).
And a step of receiving the respective processing lines X and Y in the state where the processing lines X and Y are separated,
The step of substantially separating and removing the chlorine-containing polymer resin material from each synthetic resin (A) and (B) and the synthetic resins (A) and (B) before and / or after the step are granular synthetic resins. Material
(a) and (b), respectively, a step of supplying the granular synthetic resin material (a) and (b) as a fuel or the like to a furnace, and a chlorine-containing polymer resin material that has been separated and removed. , The hydrochloric acid waste liquid is pyrolyzed in the roasting furnace to be supplied to a roasting furnace in a hydrochloric acid recovery facility for recovering hydrochloric acid and burned, and hydrogen chloride generated by the combustion is pyrolyzed by the hydrochloric acid waste liquid. A method for treating synthetic resins, comprising the step of taking out the generated hydrochloric acid gas out of the furnace and recovering it as hydrochloric acid. 3. Synthetic resins are mainly composed of a film-shaped synthetic resin material (A) and other synthetic resins (B).
Receiving into the respective processing lines X and Y in a state where the chlorine-containing polymer resin material is substantially separated and removed from the synthetic resin (A) in the processing line X and the processing line Y. And a step of processing the synthetic resin (A) which has been subjected to the step to a volume-solidified granular synthetic resin material (a) by melting or semi-melting by heat and then solidifying, and the processing line In Y, the chlorine-containing polymer resin material is substantially treated after the synthetic resin (B) is crushed to be processed into the granular synthetic resin material (b) and after the crushing treatment or in the middle of a plurality of crushing treatment steps. And a step of supplying the granular synthetic resin materials (a) and (b) to a furnace as a fuel, and the like. To recover hydrochloric acid by thermal decomposition in It is characterized in that it comprises a step of supplying it to a roasting furnace in a hydrochloric acid recovery facility and burning it, and taking out hydrogen chloride generated by the combustion with the hydrochloric acid gas generated by thermal decomposition of the hydrochloric acid waste liquid to the outside of the furnace and recovering it as hydrochloric acid. The method for treating synthetic resins. 4. The processed synthetic resin is supplied to a blast furnace as a reducing agent of an iron source.
Alternatively, the method for treating synthetic resins according to 3). 5. A hydrochloric acid recovery equipment is attached to a steel material pickling equipment, and is a pickling waste liquid treatment equipment for thermally decomposing a steel material pickling waste solution in a roasting furnace to recover hydrochloric acid. The method for treating synthetic resins according to claim 1, 2, 3, or 4. 6. The granular synthetic resin materials (a) and (b) are pneumatically fed into a furnace and blown into the furnace.
Or the method for treating synthetic resins according to 5. 7. The step of processing the synthetic resin (A) into a granular synthetic resin material (a) comprises at least a step of heating and melting the synthetic resin (A) and then cooling to solidify it. 7. A process for obtaining a synthetic resin material (a) according to claim 2, 3, 4, 5 or 6, which comprises cutting or crushing a solidified synthetic resin material to obtain a granular synthetic resin material (a). Method. 8. The step of processing the synthetic resin (A) into a granular synthetic resin material (a) includes at least a step of cutting or crushing the synthetic resin (A), and the cut or crushed synthetic resin material. A step of semi-melting by heating or frictional heat caused by cutting or crushing, and a synthetic resin material which is contracted and solidified into particles by rapidly cooling the semi-molten synthetic resin material
3. A step of obtaining (a),
The method for treating synthetic resins according to 3, 4, 5 or 6. 9. The step of processing the synthetic resin (A) into the granular synthetic resin material (a) includes at least a step of cutting or crushing the synthetic resin (A), and the cut or crushed synthetic resin material. Heating or semi-melting by frictional heat by cutting or crushing, shrinking and solidifying the semi-molten synthetic resin material by quenching, and crushing the shrink-solidified synthetic resin material to form granular synthesis The step of obtaining a resin material (a), the method of claim 2, 3, 4, 5,
Alternatively, the method for treating synthetic resins according to Item 6. 10. The synthetic resin (A) is a granular synthetic resin material (a).
In the step of processing, the synthetic resin (A) is cut or crushed by a rotary blade that rotates at a high speed, and the synthetic resin material is semi-melted by frictional heat due to the cutting or crushing, and then the semi-molten synthetic resin is cut. The synthetic resin treatment method according to claim 2, wherein the granular synthetic resin material (a) is obtained by shrinking and solidifying the material in a granular form by quenching the material. 11. A synthetic resin material (A) is a granular synthetic resin material (a).
In the step of processing, the synthetic resin (A) is cut or crushed by a rotary blade that rotates at a high speed, and the synthetic resin material is semi-melted by frictional heat due to the cutting or crushing, and then the semi-molten synthetic resin is cut. The material is made to shrink and solidify by quenching, and at the same time as the shrinkage and solidification, a pulverization process is performed by the rotary blade to obtain a granular synthetic resin material (a). A method for treating the synthetic resins described. 12. The granular synthetic resin materials (a) and (b) are mixed at least immediately before the furnace is blown, and the mixture is blown into the furnace. 6, 7,
8. The method for treating synthetic resins according to 8, 9, 10 or 11. 13. The granular synthetic resin materials (a) and (b) are mixed, and the mixture is pneumatically fed into the furnace and blown into the furnace. , 7, 8, 9, 10
Alternatively, the method for treating synthetic resins according to item 11. 14. The granular synthetic resin materials (a) and (b) are mixed in a weight ratio of (a) / [(a) + (b)]: 0.10 or more. Item 12. A method for treating synthetic resins according to Item 12 or 13. 15. Synthetic resin materials (A) and (B) have a bulk density of 0.30 at each processing step in processing lines X and Y.
Above, granular synthetic resin materials (a) and (b) having a repose angle of 40 ° or less
Processed into
The method for treating synthetic resins according to 6, 7, 8, 9, 10, 11, 12, 13 or 14. 16. A processing facility for performing a step of substantially separating and removing a chlorine-containing polymer resin material from a synthetic resin and a step of processing a synthetic resin into a shape suitable for feeding into a furnace, and the processing facility. A supply means for supplying the synthetic resins processed in the processing equipment to the furnace as fuel, and the chlorine-containing polymer resin material separated and removed in the processing equipment, and thermally decomposing the hydrochloric acid waste liquid in the roasting furnace. A treatment facility for synthetic resins, comprising a supply means for supplying as a fuel to a roasting furnace in a hydrochloric acid recovery facility for recovering hydrochloric acid. 17. A step of receiving a synthetic resin (A) mainly composed of a film-shaped synthetic resin material, and substantially separating and removing a chlorine-containing polymer resin material from the synthetic resin (A), and a synthetic resin ( A processing line X in which a step of processing A) into a granular synthetic resin material (a) is performed, and a synthetic resin (B) other than the synthetic resin (A) are received,
The step of substantially separating and removing the chlorine-containing polymer resin material from the synthetic resin (B), and the synthetic resin (B) being a granular synthetic resin material.
Processing line Y in which the processing step is performed in (b)
And a supply means for supplying the granular synthetic resin materials (a) and (b) obtained in the processing line X and the processing line Y to the furnace as a fuel or the like in a mixed state or without mixing, The chlorine-containing polymer resin material separated and removed in the processing line X and the processing line Y is used as fuel in a roasting furnace in a hydrochloric acid recovery facility for thermally decomposing hydrochloric acid waste liquid in the roasting furnace to recover hydrochloric acid. A treatment facility for synthetic resins, comprising: a supply unit for supplying. 18. A step of receiving a synthetic resin (A) mainly comprising a film-like synthetic resin material, and substantially separating and removing the chlorine-containing polymer resin material from the synthetic resin (A), and a synthetic resin ( A processing line X in which a step of processing A) into a granular synthetic resin material (a) is performed, and a synthetic resin (B) other than the synthetic resin (A) are received,
The step of substantially separating and removing the chlorine-containing polymer resin material from the synthetic resin (B), and the synthetic resin (B) being a granular synthetic resin material.
Processing line Y in which the processing step is performed in (b)
And a supply means for supplying the granular synthetic resin materials (a) and (b) obtained in the processing line X and the processing line Y to the furnace as fuel or the like in a mixed state or without mixing, The chlorine-containing polymer resin material separated and removed in the processing line X and the processing line Y is fueled to a roasting furnace in a hydrochloric acid recovery facility for thermally decomposing hydrochloric acid waste liquid in the roasting furnace to recover hydrochloric acid. The processing line X has at least a separator for separating and removing the chlorine-containing polymer resin material from the synthetic resins (A) from the inlet side, and the processing line X has a chlorine-containing polymer. The synthetic resin (A) from which the resin material has been separated and removed is melted or semi-melted by heat and then solidified to process the volume-solidified granular synthetic resin material (a) into a granular solidification device. , The processing line Y is small from the entrance side At the very least, a primary or multiple crushing device for crushing the synthetic resins (B), a sorting device for separating and removing foreign substances from the crushed synthetic resins (B), and removing foreign substances Synthetic resins
And a crushing device for crushing (B) into a granular synthetic resin material (b), and containing the synthetic resin (B) or the granular synthetic resin material (b) at the inlet side or the outlet side of the crushing device. A treatment facility for synthetic resins, characterized by having a separation device for separating and removing a chlorine polymer resin material. 19. A pickling waste liquid treatment facility for recovering hydrochloric acid, wherein the hydrochloric acid recovery facility is attached to a steel material pickling facility and thermally decomposes a steel material pickling waste liquid in a roasting furnace. The facility for treating synthetic resins according to claim 16, 17 or 18.