JP2003130318A - Industrial waste treatment plant - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the number of final treatment facilities and to contribute to resources saving by recycling most of the molten matters and fly ash generated in the waste incineration process. SOLUTION: The molten matters obtained by waste incineration at a waste treatment facility 2 are utilized at a smelter 27 as raw material, flux, or cold charge, and the fly ash obtained from the same is caked at an ash fly desalting facility 22 and then utilized at the smelter 27 as raw material, flux, or cold charge. The filtrate obtained at the desalting facility 22 in a fly ash caking process is used as a liquid for neutralizing flue gas from the smelter 27. Since little remains unused of the molten matters or fly ash, the plant reduces the number of final treatment facilities and contributes to resources saving.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an industrial waste treatment plant, and more particularly, to industrial waste suitable for recycling industrial waste such as automobile shredder dust, waste home electric appliance dust, copper-containing plating sludge, substrates and the like. The present invention relates to a material processing plant.

[0002]

2. Description of the Related Art Conventionally, industrial waste such as automobile shredder dust, waste home appliance dust (generated in home appliance recycling plants), copper-containing plating sludge (generated in plating plants) substrates (PC substrates, TV substrates, etc.) are industrially discarded. A material recovery company collects the wastes from factories and brings them to the intermediate waste treatment facility, and the residue obtained by incineration at the intermediate waste treatment facility is brought to the final disposal site as landfill waste.
Alternatively, they were brought directly from the factory to the final disposal site and landfilled.

[0003]

However, since incineration melts and fly ash obtained by incinerating and melting industrial wastes as described above contain many reusable substances, this It is necessary to collect and save resources.

Further, since a large amount of harmful substances is contained in the residue of industrial waste, when the landfill is disposed at the final disposal site, the harmful substances may dissolve into rainwater and pollute the surrounding environment. Therefore, it is necessary to collect this.

Furthermore, with the recent rapid increase in industrial waste and the drastic decrease in the number of new final disposal sites, the remaining life of the final disposal sites is decreasing, resulting in a residue of industrial waste. It is necessary to reduce the amount of landfill waste that is brought into the final disposal site by recycling and reusing it.

Conventionally, the actual situation is that effective and appropriate equipment that meets the above-mentioned demand has not been provided.

The present invention has been made in view of the above conventional problems, and it is possible to recover reusable materials from incineration melts and fly ash obtained by incineration of industrial wastes. In addition to saving resources, incinerating industrial waste eliminates the risk of polluting the environment around the final disposal site by collecting harmful substances from the melt and fly ash. It is an object of the present invention to provide an industrial waste treatment plant capable of reducing the amount of landfill waste carried into a final disposal site by recycling and reusing the melt and fly ash.

[0008]

In order to solve the above problems, the present invention employs the following means. The invention according to claim 1 includes a waste treatment facility and a smelting facility, the waste treatment facility includes an incineration treatment facility that incinerates and melts waste, and the smelting facility incinerates the incineration treatment facility. It is characterized by comprising equipment for adding an incineration melt obtained by the melting treatment or a fly ash component. According to the industrial waste treatment plant of the present invention, incineration melt and fly ash are obtained by incinerating the waste in the incineration treatment facility of the waste treatment facility, and the incineration melt and fly ash are produced. It will be used in the smelting facility.

The invention according to claim 2 is the industrial waste treatment plant according to claim 1, wherein the smelting facility uses the incineration melt generated in the incineration treatment facility as a raw material, a flux or a cooling agent. It is characterized by being an institution. According to the industrial waste treatment plant of the present invention, the incinerated melt generated in the incineration treatment facility of the waste treatment facility is used as the raw material, flux, and cooling agent in the smelting facility.

The invention according to claim 3 is the industrial waste treatment plant according to claim 2, wherein the smelting facility is a facility for recovering the metal contained in the incineration melt generated from the incineration treatment facility. It is characterized by being. According to the industrial waste treatment plant according to the present invention, the incineration melt generated in the incineration treatment facility of the waste treatment facility is used as a raw material, flux, and a cooling agent in the smelting facility, and is smelted to The metal contained therein will be recovered.

The invention according to claim 4 is the industrial waste treatment plant according to claim 2, which comprises a fly ash desalination facility for leaching the fly ash generated in the incineration facility to desalinate it. It is characterized by becoming. According to the industrial waste treatment plant of the present invention, fly ash generated in the incineration treatment facility of the waste treatment facility is water-leached in the fly ash desalination facility,
It will be desalted.

The invention according to claim 5 is the industrial waste treatment plant according to claim 4, wherein the smelting facility is a solid obtained by water leaching and solid-liquid separation in the fly ash desalination facility. It is characterized in that the component is used as a raw material, a flux or a cooling agent. According to the industrial waste treatment plant of the present invention, solid components obtained by water leaching and solid-liquid separation in a fly ash desalination facility are used as raw materials, fluxes, and cooling agents in a smelting facility. Become.

The invention according to claim 6 is the industrial waste treatment plant according to claim 5, wherein the smelting facility is a facility for recovering metals contained in the solid components. It is a thing. According to the industrial waste treatment plant of the present invention, the metal contained therein is recovered from the solid component obtained by water leaching and solid-liquid separation in the fly ash desalination facility.

The invention according to claim 7 is the industrial waste treatment plant according to claim 5, wherein the smelting facility uses the alkaline desalination solution produced in the fly ash desalination facility as a neutralizing agent. It is characterized in that it is equipped with a water treatment facility. According to the industrial waste treatment plant of the present invention, the alkaline desalination solution produced in the fly ash desalination facility is used as a neutralizing agent in the water treatment facility in the smelting facility.

The invention according to claim 8 is the industrial waste treatment plant according to any one of claims 1 to 7, wherein the smelting facility is a smelting furnace, which is a flash furnace or a reverberation furnace. , A blast furnace, an S furnace, a Nolander furnace, an Inco furnace, an Isa furnace, a PS converter, a hobogen converter, a C furnace, or a refining furnace. According to the industrial waste treatment plant of the present invention, the incineration melt or fly ash component obtained by the incineration melt treatment of the incineration facility,
Smelting furnace, that is, a flash furnace, a reverberatory furnace, a blast furnace, an S furnace, a Nolander furnace, an Inco furnace, an Isa furnace, or a PS converter, a hobogen converter, a C furnace, or a refining furnace. It

The invention according to claim 9 is the industrial waste treatment plant according to any one of claims 1 to 8, wherein the smelting facility granulates the incineration melt generated in the incineration treatment facility. It is characterized in that it is equipped with equipment for throwing in the material classified by a particle size screen. According to the industrial waste treatment plant of the present invention, the incinerated melt is classified into an appropriate particle size and then used in the smelting facility.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show an embodiment of an industrial waste treatment plant according to the present invention. The industrial waste treatment plant 1 comprises a waste treatment facility 2 and a smelting facility 27. There is.

The waste treatment facility 2 comprises a waste incineration / melting facility 3 and a fly ash desalination facility 22. The waste incineration / melting facility 3 includes a solid waste raw material pit 4, Waste oil tank 8, waste liquid tank 9, kiln furnace 10, secondary combustion furnace 14, waste heat boiler 15, exhaust gas cooling tower 16, slaked lime tank 17, activated carbon tank 18, bag filter 1
9, a catalyst tower 20, and a fly ash slurry tank 21. The fly ash desalination facility 22 includes a water leaching tank 23, a filter press 24, a filter cake pit 25, and a filtrate tank 2.
It is composed of 6.

The solid waste raw material pit 4 of the waste incineration / melting facility 3 receives the solid waste 35. Examples of the solid waste 35 include automobile shredder dust 35a and waste home appliance dust. 35b (generated at home appliance recycling plant), copper-containing plating sludge 3
5c (generated in a plating factory), substrate 35d (personal computer substrate, television substrate, etc.) and the like.

The solid waste 35 is carried in by a truck or the like, and stored in the solid waste raw material pit 4 after being classified by type. The stored waste 35 (hereinafter, referred to as processing raw material 35) is supplied to the combustibles supply hopper 6 for each type by the crane 5. In the combustible material supply hopper 6, the processing raw material 35 is layered for each type. Sludges of the processing raw material 35 are conveyed to the kiln furnace 10 by the sludge supply conveyor 7.

The waste oil tank 8 is for receiving waste oil which is liquid waste such as recycled oil (purified automobile engine oil). The waste oil stored in the waste oil tank 8 is used in the auxiliary combustion burner of the kiln furnace 10 or the secondary combustion furnace 14.

The waste liquid tank 9 contains a copper chloride waste liquid (generated at the plating factory: acidic), a copper sulfate waste liquid (generated at the plating factory: acidic), a mixed acid (generated at the silicon factory: acidic), and a scrubber waste liquid (generated at the silicon factory: It accepts waste liquid which is liquid waste such as alkaline) and lapping liquid (generated at silicon factory: alkaline). The waste liquid is stored separately in a waste acid tank and a waste alkali tank according to the liquid pH. The pH of the waste liquid stored in the waste acid tank and the waste alkali tank is adjusted by mixing the waste acid and the waste alkali liquid in the neutralization tank, and spray vaporization is performed in the secondary combustion furnace 14 by the spray nozzle.

The kiln furnace 10 functions as an incineration treatment facility, and a conveyer conveyor 11 is used as a system for introducing the processing raw material 35 into the kiln furnace 10. Raw materials for automobile shredder dust, waste home appliance dust, and substrates are transferred to the hopper 6 by the crane 5, extracted by the belt feeder or the pan conveyor 12 by the hopper 6, and supplied to the transfer conveyor 11. The copper-containing plating sludge is transferred to the hopper separately by the crane 5,
The screw conveyor 7 pulls out the hopper, and the belt conveyor 13 conveys the conveyor 11
Is supplied to. The sludge hopper is used as a separate system because it is mixed uniformly and a stable treatment is performed.
A double damper system is adopted at the inlet of the kiln furnace 10 to prevent gas leakage in the kiln furnace 10.

The processing raw material 35 is incinerated and melted (melt temperature: 1200 to 1300 ° C.) in the kiln furnace 10. The incineration and melting treatment raw material 35 is water granulated in the water cooling pit at the exit of the kiln. The recovered material is incinerated molten material, that is, molten slag and metal, and incinerated fly ash (fly ash) recovered by a boiler or a bag filter. Copper,
Since it contains gold, silver, SiO ₂ , and CaO components,
It can be effectively used as a copper raw material and a flux (silica sand, lime substitute) in the copper smelting facility 27. The copper, gold, silver, lead slag, zinc slag, and copper slag are finally recovered from the incinerated melt at the copper smelting facility 27. Lead slag and zinc slag serve as lead smelting raw material and zinc smelting raw material, respectively, and copper slag serves as an iron raw material for cement. Since fly ash generated from this kiln furnace 10 contains Na, K, and Cl, this is treated in a fly ash desalination facility. Water-granulated molten slag and metal are those with a particle size screen of 5 mm or more.
mm or less. This is to divide into those that can be directly charged from the ore charging equipment of the smelting furnace and those that must be charged from another charging port of the smelting furnace. From the viewpoint of ease of processing, it is desirable that the particle size be crushed to 5 mm or less.

In the secondary combustion furnace 14, the unburned gas is completely combusted, the temperature in the furnace is 800 ° C. or more, and the exhaust gas retention time is 2 seconds or more, so that the dioxins are completely decomposed. At the outlet of the secondary combustion furnace 14, the neutralized waste liquid is sprayed and vaporized and cooled so that the outlet exhaust gas temperature becomes 800 to 950 ° C. For chlorine-based waste liquid, control the amount of chloride. This is to address the problem of corrosion and final exhaust gas concentration regulations.

In the waste heat boiler 15, the boiler inlet exhaust gas temperature is 800 to 950 ° C., and the boiler outlet temperature is 45.
Steam recovery is performed so that the temperature becomes approximately 0 ° C. The recovered steam is converted into superheated steam with a superheater, and power is recovered with a turbine generator.

The exhaust gas quenching tower 16 quenches the gas at a boiler outlet gas (temperature of about 450 ° C.) with water or waste liquid by spraying quenching to a gas temperature of 160 to 180 ° C. to prevent dioxin resynthesis.

At the inlet of the bag filter 19, slaked lime and activated carbon are added to the exhaust gas from the slaked lime tank 17 and the activated carbon tank 18. Slaked lime is intended for dechlorination and desulfurization in exhaust gas. Activated carbon is intended to remove dioxin adsorbed in exhaust gas and remove heavy metal vapors. The soot and dust such as chlorides and heavy metals collected by the bag filter is called "fly ash". In the above cases, heavy metal and dioxin may be sufficiently separated only by slaked lime and bag filter 19.

The bag filter 19 is intended for removing and separating soot and dust in the exhaust gas. A filter is installed in the device and dust is collected by ventilating the filter. The exhaust gas temperature here needs to be about 160 ° C to 180 ° C. This is because at a temperature lower than this, there is a risk of clogging due to water coagulation and the like (due to dew condensation), and at a temperature higher than this, dioxin and the like are easily resynthesized from adsorbed chlorine and organic substances. The particle size of the filter mesh is 100μ
m or less is desirable.

The catalyst tower 20 decomposes dioxin in the exhaust gas at the outlet of the bag filter 19 with a catalyst so that the exhaust gas regulation value becomes 0.1 ng-TEQ / mN3 or less.

The fly ash slurry tank 21 is a waste heat boiler 1
5, the fly ash collected in the exhaust gas quenching tower 16 and the bag filter 19 is slurried, and the silo 36
The fly ash sent to the fly ash slurry tank 21 via (fly ash hopper) is directly slurried and sent to the fly ash desalination facility 22.

The fly ash desalination facility 22 receives and processes the slurry fly ash from the waste incineration / melting facility.
Further, various fly ash carried in by a tank truck or a flexible container bag can be received and processed from the outside.

In the water leaching tank 23 of the fly ash desalination facility 22, various fly ash slurries sent at a solid-liquid ratio of 1: 3 are received in the leaching tank, and the in-house waste water or industrial water has a solid-liquid ratio of 1: 5. Water-soluble component N contained in the fly ash by stirring for several hours
a, K, Cl, etc. (partly containing Ca) are eluted into the liquid.
The liquidity is about pH 10-12. Note that the effect of removing Na, K, and Cl is better when the leaching is performed in multiple stages.

In the filter press 24, the water-leached slurry fly ash is filtered, and Na, K and C eluted in water are filtered.
Cu, Pb, Z remaining in the slag while separating l etc.
Separated from n, Ca, SiO _{2 and the} like.

The filter cake pit 25 stores the filter cake obtained by the filter press 24. Cu, Pb, Zn, in the filter cake
Ca, SiO _{2 and the} like are contained, and by using the copper smelting facility 27, metals such as Cu, Pb and Zn are recovered and separated. Ca, SiO _2, etc. are added to various smelting furnaces as an alternative to the flux for copper smelting and used, and recovered as copper slag.

In the pressing process by the filter press 24
Since a large amount of filtrate is discharged per batch,
Is stored in the filtrate tank 26 (cushion tank). Filtrate
Is a constant quantity pump from the filtrate tank 26 to the neutralization tank of the wastewater treatment plant.
Supplied. The filtrate is approximately 100 to 200 g / L of Ca.
Containing, pH around 10-12, in alkaline solution
Used in the wastewater treatment plant neutralization process (pH approx. 12)
It can be used as a substitute raw material for slaked lime for neutralization. Neutralization result
Zn, Cu, Fe, As, CaSO are produced. _FourEtc.
Sludges that consist of A large amount of Cl is mixed in this
It is better to wash it so that it does not occur. This sludge is
It is put into a seed copper smelting furnace. As a result, the treated wastewater
(PH about 12) is produced. Re-neutralize this to pH around 8
And then release.

As shown in FIG. 2, the smelting facility 27 includes a smelting furnace 28, a converter 29, and a refining furnace 30. In the smelting furnace 28, the slag and metal obtained in the waste incineration / melting facility 3 and the filter cake obtained in the fly ash desalination facility 22 are charged as raw materials, flux and coolant together with the copper raw material. In the smelting furnace 28, raw materials such as slag, metal, and filter cake are melt-oxidized together with the copper raw material, and are separated into copper slag (upper layer) and mat (lower layer) due to a difference in specific gravity.

The mat obtained in the smelting furnace 28 is extracted from the smelting furnace 28 and sent to the converter 29.
At, the mat is oxidized to obtain blister copper.

The crude copper obtained in the converter 29 is sent to the refining furnace 30, where it is oxidized and then reduced to be refined into higher quality copper. As a result, purified copper is obtained. After that, the refined copper is extracted from the refinement furnace 30 and cast to form an anode plate, and this anode plate is electrolyzed in a copper electrolysis plant 31 to become electrolytic copper. The remaining precipitate (slime) converted from the anode plate into electrolytic copper is smelted in the precious metal factory 32. As a result, Au, Ag, Pt, Pd, T
Metals made of metals such as e and Se are collected.

In the waste treatment plant according to this embodiment configured as described above, the incineration melt obtained by treating the waste in the waste incineration / melting facility,
Fly ash is used as a raw material, a flux, and a cooling agent in a smelting facility, and the fly ash is leached in a fly ash desalting facility 22 and solid components obtained by solid-liquid separation are used as raw materials in a smelting facility 27 Since it is used as a flux and a cooling agent, and the filtrate is used in a wastewater treatment plant that treats the liquid that has cleaned the exhaust gas from the smelting facility 27, most of the incineration melt and fly ash must be reused. You will be able to Therefore, since it is not necessary to bring the incinerated melt and fly ash as landfill waste to the final disposal site for landfill disposal, it is possible to sufficiently cope with the reduction of the final disposal site. Further, since the incinerated melt and fly ash to be landfilled in the final disposal site are eliminated, the environment around the final disposal site is not contaminated by the harmful substances contained in the incinerated melt and fly ash. Further, since metals such as copper contained in the incinerated melt and fly ash can be recovered and recycled, resource saving can be achieved. In addition,
In the present invention, the smelting facility is any one of a smelting furnace, that is, a flash furnace, a reverberatory furnace, a blast furnace, an S furnace, a Nolander furnace, an Inco furnace, an Isa furnace, or a PS converter, a hobogen converter, or a C furnace. Alternatively, it may be a refining furnace or the like.

[0041]

As described above, according to the present invention, the incineration melt obtained by incinerating and melting the waste in the waste treatment facility, the fly ash, the raw material of the smelting facility, the flux, the cooling agent. , And by recovering the metal contained in these by the smelting facility,
Obtained at a waste treatment facility by using the alkaline solution obtained when treating fly ash at a fly ash desalination facility as a neutralizing liquid at a wastewater treatment plant that treats the liquid that has cleaned the exhaust gas of a smelting facility. Most of the incinerated melt and fly ash can be recycled and reused. Therefore,
Resource saving can be achieved. In addition, since most of the incinerated melt and fly ash can be recycled, there will be no residue to be transported to the final disposal site and disposed of as landfill waste, and the final disposal site will be adequately reduced. You will be able to Furthermore, since there are no residues left for landfill at the final disposal site, the environment around the final disposal site will not be contaminated by the harmful substances contained in the residues.

[Brief description of drawings]

FIG. 1 is a flow chart showing an entire embodiment of a waste treatment plant according to the present invention.

FIG. 2 is a flow chart of the smelting facility shown in FIG.

[Explanation of symbols]

1 ... Industrial waste treatment plant 2 ... Waste treatment facility 22 ... Fly ash desalination facility 27 ... Smelting facility

Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) C22B 13/00 C22B 15/00 15/00 19/30 19/30 F23G 7/00 A F23G 7/00 103Z 103 F23J 1 / 00 B F23J 1/00 B09B 3/00 304G 15/00 303J 15/02 303K F23J 15/00 C Z (72) Inventor Fumihiko Ogino 4049, Naoshima-cho, Kagawa-gun, Kagawa Mitsubishi Mate Real Co., Ltd. Naoshima Smelting Co., Ltd. In-house F-term (reference) 3K061 AA07 AA23 AB03 AC05 AC06 AC13 AC14 AC15 AC20 CA01 DA18 DA19 DB01 NB03 NB15 NB21 3K070 DA05 DA12 DA16 DA32 DA36 DA37 DA45 DA49 DA64 DA76 4D004 AA24 AA28 AA37 AA50 BA05 CA08 CA45 CA09 CA40 CA13 CA28 CA47 CA13 CA28 CA13 CA28 CA13 CA28 CA14 CA28 CA13 CA28 CA13 CA28 CA13 AA20 AA30 BA14 BA22 CA49 GA02 GA03 GA04 GA06

Claims (9)

[Claims] 1. A waste treatment facility and a smelting facility, wherein the waste treatment facility includes an incineration treatment facility that incinerates and melts waste, and the smelting facility incinerates and melts the incineration treatment facility. An industrial waste treatment plant comprising equipment for adding incinerated melt or fly ash obtained by treatment. 2. The industrial waste treatment plant according to claim 1, wherein the smelting facility is a facility that uses the incineration melt generated in the incineration facility as a raw material, a flux, or a cooling agent. A characteristic industrial waste treatment plant. 3. The industrial waste treatment plant according to claim 2, wherein the smelting facility is a facility for recovering the metal contained in the incineration melt generated from the incineration treatment facility. Industrial waste treatment plant. 4. The industrial waste treatment plant according to claim 2, further comprising a fly ash desalination facility for leaching the fly ash generated in the incineration treatment facility with water to perform desalination treatment. Industrial waste treatment plant. 5. The industrial waste treatment plant according to claim 4, wherein the smelting facility uses a solid component obtained by water leaching and solid-liquid separation in the fly ash desalination facility as a raw material or a flux or Industrial waste treatment plant characterized by being used as a cooling agent. 6. The industrial waste treatment plant according to claim 5, wherein the smelting facility is a facility for recovering a metal contained in the solid component. 7. The industrial waste treatment plant according to claim 5, wherein the smelting facility comprises a water treatment facility that uses the alkaline desalination solution produced in the fly ash desalination facility as a neutralizing agent. An industrial waste treatment plant characterized by the following. 8. The industrial waste treatment plant according to claim 1, wherein the smelting facility is a smelting furnace, which is a flash furnace, a reverberatory furnace, a blast furnace, an S furnace, An industrial waste treatment plant, which is a Nolander furnace, an Inco furnace, an Isa furnace, or a PS converter, a hobogen converter, a C furnace, or a refining furnace. 9. The industrial waste treatment plant according to any one of claims 1 to 8, wherein the smelting facility granulates the incineration melt generated in the incineration treatment facility and classifies it with a particle size screen. An industrial waste treatment plant, which is equipped with equipment for throwing in waste.