KR102186054B1 - Recycling processing device for fly ashes containing heavy metals and method for treating same - Google Patents

Abstract

The present invention relates to an apparatus for recycling fly ash including heavy metals and a treatment method thereof, capable of treating the fly ash including the heavy metals in an environmentally-friendly manner. According to the present invention, the apparatus for recycling the fly ash including the heavy metals includes: a storage tank; a high-speed stirring tank for mixing the fly ash with process water in a ratio of 1:4, and performing stirring at a high speed to elute and treat the heavy metals; a first water tank to which sulfuric acid is supplied to convert urea water and ammonia including in the fly ash into ammonium sulfate; and a settling tank for precipitating fly ash slurry neutralized in the first water tank to produce first slurry and a dehydration filtrate.

Description

Recycling processing device for fly ashes containing heavy metals and method for treating same}

The present invention relates to an apparatus and method for treating a large amount of heavy metals contained in fly ash discharged from an incineration facility of industrial and household waste, and more particularly, to a mixture of fly ash, a designated waste, with water and The first slurry from which heavy metals are removed by a sedimentation tank is recycled as a raw material for cement while eluting heavy metals in the dehydration liquid generated by high-speed stirring, and the dehydration liquid is precipitated and agglomerated through a chemical reaction, and then the heavy metal components are removed. Is recycled as process water supplied to the first tank, and the second slurry to which heavy metals are immobilized is dried and then carried out to the outside to be environmentally treated, and to an apparatus for recycling and treatment of fly ash containing heavy metals.

In general, in places such as sewage treatment plants, excreta treatment plants, food waste treatment facilities, livestock facilities, etc., various organic or inorganic gases are generated to produce a complex odor, and the resulting odor reacts because the properties are complex in alkali, acid, neutral, etc. With a single chemical cleaning liquid such as a slow oxidizing agent, effective treatment of malodorous gas is difficult.

As a method of removing complex odor gas based on these characteristics, a number of nozzles are installed in the deodorization tower, and the odor is removed by contacting water with the odor-containing gas introduced into the deodorization tower (water washing method). In addition, there is a method in which an adsorbent layer such as activated carbon, silica gel, and zeolite is disposed in the deodorization tower to adsorb odor substances (adsorption method), or a specific microorganism layer is disposed instead of the adsorbent so that the microorganisms prevent odor generating substances. There is a method of decomposing (a microbial contact method).

As described above, the odor gas composed of the complex gas is usually purified by causing a neutralization reaction with a chemical solution of'acid and alkali', and such a conventional deodorization tower has low efficiency due to a slow reaction rate, but an oxidant that reacts in a complex manner (sodium hypochlorite, etc.) A bar consisting of a single deodorization tower using a single deodorization tower or an acid and alkali washing tower each configured in a tandem type connecting two deodorization towers in series, which decreases the deodorization efficiency of the complex gas, or is complicated by construction and manufacturing, and Due to the enlargement, installation space and installation cost were excessive.

In order to improve this, Korean Patent Registration No. 10-0820845 (two-liquid simultaneous cleaning and deodorization tower) (hereinafter referred to as'prior invention') has an acid and alkali cleaning tower as an integrated deodorization tower, so that each cleaning solution circulates separately. In addition, the combined gas cleaning is aimed at miniaturization of the device, while the two-stage cleaning of the jet nozzle and the pack bed is performed even when cleaning with acid or alkali alone, ensuring excellent cleaning power and allowing simultaneous neutralization of acids and alkalis. There is an effect formed to improve the deodorizing power.

However, in the above prior invention, there was a problem in that the pressure loss of the jet nozzle used for cleaning was large, and the cleaning efficiency was low due to the large number of air bubbles being sprayed, and furthermore, a method for treating the slurry contained in the waste liquid was not presented at all.

In general, leachate and washing wastewater generated from waste treatment facilities contain salts such as Nacl or Kcl. Conventionally, leachate is treated through complex treatment facilities such as degassing, DAF, biological treatment, filtration, and ozone oxidation. In addition, a by-product treatment process of dehydrating the generated slurry in a separate process to generate dehydrated cake and re-filling it must be carried out, and a separate deodorizing facility was essential to remove the high concentration odor generated during the treatment process.

In order to improve this, a vacuum evaporation (MVR) method was proposed in which the evaporation vessel was depressurized to lower the boiling point, and the dehydrated cake obtained by dewatering the evaporation residue evaporated with steam was re-embedded. However, the vacuum evaporation method has a problem in that it requires additional equipment for wastewater treatment of the gas that is not accompanied by the evaporative condensate, and requires periodic maintenance of the concentrator, resulting in a low facility operation rate.

Therefore, in order to solve this problem, the applicant of the present application applied Registration Patent Publication No. 10-2031920 (a device for manufacturing ammonium phosphate granules and a manufacturing method thereof that recycles ammonium phosphate waste liquid discharged from the semiconductor etching process), and includes it in the waste liquid. In order to effectively treat the resulting salt, a separate process and device have been proposed to treat waste liquid containing salt, and in the present invention, a recycling treatment device for treating heavy metals contained in fly ash and the I would like to propose a treatment method.

Conventionally, a method of immobilizing heavy metals on fly ash by supplying chelate or waste acid to fly ash has been used, but this method has a problem that it is not eco-friendly because the fixed fly ash is later eluted.

The present invention is to solve the above problems, and a first slurry from which heavy metals are removed by a settling tank while eluting heavy metals in a dehydration liquid produced by mixing and high-speed stirring of fly ash, which is a designated waste, contains a large amount of heavy metals. Its purpose is to provide an apparatus for recycling fly ash that is recycled as a raw material for cement and a method for treating the same.
In addition, in the present invention, after the dehydration liquid is precipitated and agglomerated by a chemical reaction, the water from which the heavy metal component is removed is recycled as process water supplied to the first tank, and the second slurry on which the heavy metal is immobilized is dried and then externally Another object is to provide an apparatus for recycling and treatment of fly ash containing heavy metals that are carried out and treated in an environment-friendly manner.

The apparatus for recycling fly ash containing heavy metals according to the present invention includes a storage tank for storing fly ash of industrial and household wastes; A high-speed stirring tank for mixing fly ash and process water in a ratio of 1:4 and stirring at a high speed of 2,000-2,500 rpm through a high-speed stirrer to elute heavy metals; A first tank in which sulfuric acid is supplied by a sulfuric acid supply tank to remove odor by converting urea water and ammonia contained in fly ash into ammonium sulfate; It comprises a sedimentation tank for sedimenting the neutralized fly ash slurry in the first water tank to generate a first slurry and a dehydration liquid, and the first slurry in the sedimentation tank is transferred to a blending device through a dehydrator, and in the blending device, the first slurry It generates heat of hydration (water hydration) in the remaining moisture of the slurry, and when used as cement, quicklime is added to increase the calcium content, dried, and then pulverized by a wet grinder, and a plurality of air slide conveyors (AC) are used. It is dried by a supply air blower that supplies external air while being circulated through it, and is carried out as powder from which heavy metals have been removed, and is recycled as a raw material for cement or building materials, and the dehydration filtrate from the sedimentation tank is transferred to a second tank, and sulfuric acid and liquid After a chemical reaction by slaked lime, the water from which heavy metal components are removed through precipitation and coagulation reactions in the first and second precipitation tanks and the electrolytic coagulation tank is recycled as process water supplied to the first tank. The second slurry to which heavy metals are immobilized is concentrated in a concentrator, dried in a dehydrator, and then taken out.

In addition, the recycling treatment method of fly ash containing heavy metals according to the present invention includes a fly ash loading and storage step (S10), a fly ash high-speed stirring step (S20), a fly ash slurry precipitation step (S30), a first slurry dehydration step (S40) and In the method of recycling the fly ash in which the mixing and drying process (S41), the quicklime input process (S42), and the crushing and storage process (S43) are sequentially performed, the first slurry is generated by the precipitated slurry in the settling tank. The first slurry dehydration process (S40) and the dehydration filtrate coagulation and precipitation process (S50) for generating a second slurry containing heavy metals and water purified from the water dehydrated in the first slurry dehydration process (S20) are divided in progress. And, in the first slurry dehydration step (S40), the first slurry transferred from the concentration tank to the dehydrator is dehydrated and transferred to the cake hopper through the conveyor (C), and the first slurry of the cake hopper is transferred to the mixing device and Drying step (S41); A quicklime input step (S42) of adding quicklime; A pulverization and storage process (S43) of generating powder from which heavy metals are removed by being transferred to a wet grinder equipped with a filter dust collecting facility through a conveyor; In order to recycle the powder from which the heavy metal has been removed as a raw material for cement or construction material, a step of carrying out (S44); proceeds sequentially, and in the dehydration filtrate coagulation and precipitation step (S50), the dehydrated filtrate of the settling tank is transferred to each stirrer (A). A liquid slaked lime input step (S51) for transferring to a second tank which is installed and separated into three compartments of a coagulation tank, a reaction tank, and a neutralization tank, and supplying sulfuric acid and liquid slaked lime in the second tank to react; An electrolytic coagulation step (S52) of sedimenting in the first and second settling tanks and coagulating the second slurry through the electrolytic coagulation tank; A second slurry dehydration step (S53) for removing moisture contained in the second slurry by a dehydrator, and a consignment treatment step (S54) for treating the second slurry to which heavy metals dried in the dehydrator 86 are immobilized; It is characterized by its technical characteristics.

According to the apparatus for recycling and treatment of fly ash containing heavy metals according to the present invention and the treatment method thereof, heavy metals are eluted in a dehydration filtrate produced by mixing and high-speed stirring of fly ash, which is a designated waste, containing a large amount of heavy metals, while heavy metals are eluted by a settling tank. There is an effect of generating additional income by recycling the removed first slurry as a raw material for cement.
In addition, after the dehydration filtrate is precipitated and agglomerated through a chemical reaction, the water from which the heavy metal component is removed is recycled as process water supplied to the first tank, and the second slurry on which the heavy metal is immobilized is dried and then taken out. There is a more environmentally friendly effect by processing.

1 is a block diagram of an apparatus for treating fly ash containing a heavy metal according to the present invention
2 is a configuration diagram of a storage tank and a dust collector as an embodiment of the present invention
3 is a configuration diagram of a high-speed stirring tank and a water tank as an embodiment of the present invention
4 is a configuration diagram of a settling tank as an embodiment of the present invention
5 is a block diagram showing a process of dehydrating, blending, drying, and grinding a slurry
6 is a block diagram showing a process of coagulation and dehydration of a dehydration filtrate

A preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

In the present invention, heavy metals contained in fly ash are eluted by high-speed agitation and separated into a dehydration liquid containing heavy metals and a first slurry from which heavy metals are removed, and then the first slurry is formed of cement or various building materials through an additional chemical reaction. Recycling as a raw material has its first technical feature, and the dehydration liquid containing heavy metals is divided into process water from which heavy metals are removed by sedimentation and agglomeration and a second slurry generated by dehydration, and the process water is recycled in high-speed agitation. In addition, the second slurry has a second technical feature as it is carried out to the outside through a process of fixing heavy metals.

Hereinafter, a step-by-step process applied to the present invention will be described in detail.

As shown in FIG. 1, the method of treating fly ash containing heavy metals according to the present invention includes a fly ash loading and storage process (S10), a high speed fly ash stirring process (S20), a fly ash slurry precipitation process (S30), and the first slurry dehydration. The process (S40), the blending and drying process (S41), the quicklime injection process (S42), and the crushing and storage process (S43) are sequentially performed.

In particular, in the sedimentation tank 40 of the present invention, water and heavy metals purified from the water dehydrated in the first slurry dehydration process (S40) and the water dehydrated in the first slurry dehydration process (S20) generates a first slurry by the precipitated slurry. There is a technical difference in that the dehydration filtrate coagulation and precipitation process (S50) for generating the included second slurry is divided into progress.
At this time, the dehydration liquid of the sedimentation tank 40 is a dehydration liquid coagulation and precipitation process (S50), an electrolytic coagulation process (S52), and a second slurry dehydration process (S53) in which heavy metals contained in the fly ash are removed. will be.

First, in the fly ash loading and storage process (S10), as shown in FIG. 2, fly ash is collected in the storage tank 10, and the dust inside the tank generated at this time is removed through the dust collector 11 and then discharged to the outside. Then, the fly ash discharged through the storage tank 10 is transferred to a conveyor through a quantitative feeder 12.

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In the fly ash high-speed stirring process (S20), as an embodiment of the present invention, after mixing the process water supplied in the process water input process (S21) to the fly ash at a certain ratio, high-speed stirring to elute the heavy metal contained in the fly ash do.

In an embodiment of the present invention, after mixing fly ash and process water in a ratio of 1: 4, as shown in Fig. 3, high-speed agitation at 2,000-2,500 rpm through each high-speed stirrer (A) to elute heavy metals for treatment Is done.

The fly ash slurry transferred to the plurality of high-speed stirring tanks 20 is transferred to the neutralization reaction tank 30 by the supply pump P, and the neutralization reaction tank 30 is formed separately into a neutralization tank and a reaction tank, and agitators installed in each The fly ash slurry is stirred by A).

At this time, the sulfuric acid filled in the sulfuric acid supply tank 31 is supplied to the neutralization tank by the sulfuric acid supply pump SP to neutralize the fly ash slurry, and the fly ash slurry neutralized by water and sulfuric acid is temporarily stored in the reaction tank.

In the fly ash slurry precipitation process (S30), as shown in FIG. 4, water filled in the reaction tank of the first water tank 30 and the fly ash slurry neutralized by sulfuric acid are transferred to the settling tank 40, and supplied from the settling tank 40. The resulting fly ash slurry is stirred with a stirrer 41 to precipitate the fly ash slurry.

On the other hand, the fly ash slurry precipitated in the sedimentation tank 40 is divided into a first slurry dehydration process (S40) and a dehydration filtrate coagulation and precipitation process (50), and is treated by dividing into two processes.

First, in the first slurry dehydration process (S40), as shown in FIG. 5, the first slurry generated in the settling tank 40 is supplied to the concentration tank 50 and concentrated by the stirrer A, and the first slurry dehydration process ( The water dehydrated in S20) is transferred to the dehydration filtrate coagulation and precipitation process (S50).

And in the mixing and drying process (S41), the first slurry transferred from the concentration tank 50 to the dehydrator 51 is dehydrated and transferred to the cake hopper 52 through the conveyor C, and the first slurry of the cake hopper 52 The slurry is transferred to the blending device 60 to blend and dry.

At this time, a quicklime input process (S42) for injecting quicklime is added to the mixing device 60, and dust generated from the slurry mixed with the quicklime supplied by the quantitative feeder 61 passes through an exhaust blower 62 to a sulfuric acid supply tank ( The first slurry of the blending device 60 from which the gas is separated and purified with clean gas through the scrubber 63 connected to 64) is transferred to the wet grinder 65 equipped with a filter dust collecting facility through a conveyor for grinding and storage. It goes through a process (S43).

The first slurry dried by the wet pulverizer 65 is circulated and transported through a plurality of air slide conveyors (AC), and the powder from which heavy metals are removed is carried out by drying by the air supply blower 66 supplying external air (S44). ) And recycled as raw materials for cement or construction materials.

On the other hand, the dehydrated filtrate eluted from the sedimentation tank 40 of the fly ash slurry precipitation process (S30) undergoes a dehydration filtrate coagulation and precipitation process (S50) as shown in FIG. 6, and the dehydration filtrate of the sedimentation tank 40 is It is transferred to the second water tank 80 through the installed flow control tank 87, and the second water tank 80 is separated into three compartments of a coagulation tank, a reaction tank, and a neutralization tank by installing each agitator (A), The dehydration liquid of the flow control tank 87 is transferred to the neutralization tank of the second water tank 80 through the supply pump P.

Sulfuric acid is supplied to the coagulation tank and the reaction tank by a sulfuric acid supply tank 70 equipped with a sulfuric acid supply pump (SP), respectively, and a liquid sintered lime supply tank for treating heavy metals eluted in the dehydration liquid by supplying liquid sintered lime to the neutralization tank Since (81) is connected, the liquid slaked lime input process (S51) is performed, and the dehydrated filtrate neutralized by sulfuric acid and liquid slaked lime passes through the first precipitation tank 82 and the second precipitation tank 84 in order and the second slurry Is precipitated, and then transferred to a concentration tank 85 to be concentrated.

In addition, an electrolytic coagulation tank 83 for an electrolytic coagulation process (S52) is connected between the first and second settling tanks 82 and 84, and heavy metal components are removed from the electrolytic coagulation tank 83. The water is recycled as process water supplied to the first water tank 30 of the fly ash stirring process (S20), and in the second slurry dehydration process (S53), the second slurry is transferred to the dehydrator (86) and generated by dehydration. The water is supplied to the first water tank 30 of the fly ash high-speed stirring process (S20).

In addition, the second slurry dried by the dehydrator 86 to which the heavy metal is immobilized is treated by a consignment treatment step S54.

Each such step-by-step process is individually performed in the apparatus of FIGS. 2 to 6.

That is, the apparatus for recycling fly ash containing heavy metals according to the present invention includes a storage tank 10 in which fly ash of industrial and household waste is stored; A high-speed agitation tank 20 for mixing fly ash and process water in a ratio of 1:4 and stirring at a high speed of 2,000-2,500 rpm through a high-speed stirrer to elute heavy metals; A first tank 30 in which sulfuric acid is supplied by a sulfuric acid supply tank 31 to remove odor by converting urea water and ammonia contained in fly ash into ammonium sulfate; It comprises a sedimentation tank 40 for generating a first slurry and a dewatering liquid by sedimenting the neutralized fly ash slurry in the first water tank 30.
In particular, the first slurry of the sedimentation tank 40 is transferred to the blending device 60 through the dehydrator 51, and in the blending device 60, heat of hydration is added to the residual moisture of the first slurry. ) And to increase the calcium content when used as cement, it is pulverized by a wet grinder 65 after re-drying it, and is circulated through a plurality of air slide conveyors (AC) to supply external air. It is dried by 66 and taken out as a powder from which heavy metals have been removed, and is recycled as a raw material for cement or building materials.
In addition, the dehydration liquid of the sedimentation tank 40 is transferred to the second water tank 80, and after a chemical reaction by sulfuric acid and liquid calcified lime, the first and second precipitation tanks 82 and 84 and the electrolytic coagulation tank 83 The water from which heavy metal components are removed through precipitation and coagulation reaction of) is recycled as process water supplied to the first water tank 30, and the second slurry fixed with heavy metals through precipitation and coagulation reaction is It is concentrated and dried in a dehydrator 86 and then taken out.

At this time, sulfuric acid is supplied to each of the sulfuric acid supply tanks 31 and 70 for neutralization to the first and second tanks 30 and 80, and quicklime is added to the blending device 60, In the second tank 80, the dehydrated liquid from which heavy metals have been eluted is supplied with the liquid slaked lime from the liquid slaked lime supply tank 81 to fix the heavy metals to generate a second slurry.
That is, the dehydration liquid of the sedimentation tank 40 passes through the flow control tank 87 in which an underwater stirrer is installed, each stirrer (A) is installed, and the second tank 80 is formed separately into three partitions: a coagulation tank, a reaction tank, and a neutralization tank. To the agglomeration tank and the reaction tank of the second water tank 80, sulfuric acid is supplied by the sulfuric acid supply tank 70 to convert the urea water and ammonia contained in the dehydration liquid into ammonium sulfate, and the neutralization tank is dehydrated. In order to convert the filtrate into a strong alkali state, the liquid slaked lime is supplied from the liquid slaked lime supply tank 81, and heavy metals contained in the fly ash are fixed to the second slurry.

As shown in Table 1 below, the apparatus for recycling and treating fly ash containing heavy metals of the present invention configured as described above can effectively remove heavy metals from fly ash of industrial waste.

Item Heavy metals for each item
Inclusion criteria Analysis data Industrial waste fly ash Industrial waste fly ash dehydration General waste
(mg/l) Waste recycling
(mg/l) Raw fly ash (mg/l) After processing
Fly ash (mg/l) Dehydration solution (mg/l) After the first treatment
Dehydration solution (mg/l) 2nd low-lip
Dehydration solution (mg/l) Lead (Pb) 3.0 1.0 363.5 Not detected 234.7 30.2 Not detected Copper (Cu) 3.0 1.0 89.4 Not detected 62.4 Not detected Not detected Arsenic (As) 15 0.5 52.9 Not detected 49.8 Not detected Not detected Mercury (Hg) 0.005 0.008 5.03 Not detected 5.01 Not detected Not detected Cadmium (Cd) 0.3 0.1 22.7 Not detected 20.7 Not detected Not detected Hexavalent chromium 15 0.1 33.92 Not detected 30.0 Not detected Not detected Cyan (CN) 1.0 0.2 72.4 Not detected 66.1 Not detected Not detected Chlorine (Cl) / 250 234,560 104.1 63.82 30.65 21.47

Therefore, the present invention can effectively remove various harmful heavy metals contained in the fly ash of industrial waste, and neutralize the slurry and dehydration liquid generated at this time and recycle them as raw materials for cement and construction site materials, thereby having a more environmentally friendly effect.

10: storage tank 11: dust collector
12, 61: quantitative feeder 20: stirring tank
30: water tank 31, 64, 70: sulfuric acid supply tank
40: settling tank 41: reducer
50: concentration tank 51: dehydrator
52: cake hopper 60: mixing device
62: exhaust blower 63: scrubber
65: wet grinder 66: air supply blower
80: second tank 81: liquid slaked lime supply tank
82: first sedimentation tank 83: electrolytic coagulation tank
84: second precipitation tank 85: thickening tank
86: dehydrator 87: flow control tank
A: Stirrer AC: Air slide conveyor
C: Conveyor P: Supply pump
SP: Sulfuric acid supply pump

Claims (7)

A storage tank 10 in which fly ash of industrial and household waste is stored; A high-speed agitation tank 20 for mixing fly ash and process water in a ratio of 1:4 and stirring at a high speed of 2,000-2,500 rpm through a high-speed stirrer to elute heavy metals; A first tank 30 in which sulfuric acid is supplied by a sulfuric acid supply tank 31 to remove odor by converting urea water and ammonia contained in fly ash into ammonium sulfate; Consisting of including a settling tank 40 for generating a first slurry and a dehydration liquid by sedimenting the neutralized fly ash slurry in the first tank 30,
The first slurry of the sedimentation tank 40 is transferred to the blending device 60 through the dehydrator 51, and the blending device 60 applies heat of hydration to the residual moisture of the first slurry. When generated and used as cement, quicklime is added to increase the calcium content, re-dried, pulverized by a wet grinder 65, and circulated through a plurality of air slide conveyors (AC) to supply external air. ) To remove heavy metals and recycled as raw materials for cement or construction materials,
The dehydration liquid of the sedimentation tank 40 is transferred to the second water tank 80, and after a chemical reaction by sulfuric acid and liquid calcified lime, the first and second sedimentation tanks 82 and 84 and the electrolytic coagulation tank 83 The water from which heavy metal components are removed through precipitation and coagulation reactions is recycled as process water supplied to the first tank 30, and the second slurry on which heavy metals are immobilized through precipitation and coagulation reactions is concentrated in the concentrator 85 An apparatus for recycling fly ash containing heavy metals, characterized in that after being dried in a dehydrator (86) and taken out.
The method of claim 1,
The dehydrated filtrate from the sedimentation tank 40 is transferred to a second water tank 80 separated into three sections: a coagulation tank, a reaction tank, and a neutralization tank, and each agitator (A) is installed through a flow control tank 87 installed with an underwater stirrer. And
Sulfuric acid is supplied to the agglomeration tank and the reaction tank of the second water tank 80 by a sulfuric acid supply tank 70 to convert the urea water and ammonia contained in the dehydration liquid into ammonium sulfate, and the dehydration filtrate is in a strong alkali state. Liquid slaked lime is supplied from the liquid slaked lime supply tank 81 in order to convert it into a recycling processing device for fly ash containing heavy metals.
Fly ash loading and storage process (S10), fly ash high-speed stirring process (S20), fly ash slurry precipitation process (S30), first slurry dehydration process (S40), mixing and drying process (S41), and quicklime input process (S42) And, in the recycling treatment method of fly ash in which the crushing and storage process (S43) is sequentially performed,
In the sedimentation tank 40, a first slurry dehydration process (S40) for generating a first slurry by the precipitated slurry, and a second slurry containing water and heavy metals purified from the water dehydrated in the first slurry dehydration process (S40). The dehydration filtrate coagulation sedimentation process (S50) to generate the slurry is divided and proceeds,
In the first slurry dehydration step (S40), the first slurry transferred from the concentration tank 50 to the dehydrator 51 is dehydrated and transferred to the cake hopper 52 through a conveyor C, and the cake hopper 52 One slurry is a blending and drying process (S41) transferred to the blending device 60; A quicklime input step (S42) of adding quicklime; A pulverization and storage step (S43) of generating powder from which heavy metals are removed by being transferred to the wet pulverizer 65 equipped with a filter dust collecting facility through a conveyor; Carrying out process (S44) to recycle the powder from which the heavy metal is removed as a raw material for cement or construction material; proceeds sequentially,
In the dehydration filtrate coagulation and sedimentation step (S50), the dehydration filtrate from the sedimentation tank 40 is transferred to a second water tank 80 separated into three sections of a coagulation tank, a reaction tank, and a neutralization tank by installing each stirrer (A), In the second water tank 80, a liquid sintered lime input step (S51) of supplying and reacting sulfuric acid and liquid sintered lime; An electrolytic coagulation step (S52) of sedimenting in the first and second settling tanks 82 and 84 and coagulating the second slurry through the electrolytic coagulation tank 83; A second slurry dehydration step (S53) in which moisture contained in the second slurry is removed by the dehydrator 86, and a consignment treatment step (S54) in which heavy metals dried in the dehydrator 86 are immobilized. ; Recycling treatment method of fly ash containing heavy metals, characterized in that it proceeds sequentially.
The method of claim 3,
The water from which heavy metal components are removed by the electrolytic coagulation tank 83 in the electrolytic coagulation process (S52) is supplied to the first tank 30 of the fly ash stirring process (S20) for recycling as process water,
In the second slurry dehydration process (S53), the moisture contained in the second slurry is separated by the dehydrator 86 by the dehydrator 86 and supplied to the first tank 30 of the fly ash high-speed stirring process (S20). A method for recycling and treatment of fly ash containing heavy metals.
The method of claim 3,
In the mixing and drying process (S41) and the quicklime injection process (S42), dust generated from the slurry mixed with the quicklime supplied by the quantitative feeder 61 is transferred to the sulfuric acid supply tank 64 through the exhaust blower 62. The slurry of the mixing device 60, which is purified with clean gas through the lava 63 and separated from the gas, is transferred to a wet grinder 65 equipped with a filter dust collecting facility through a conveyor, and undergoes a pulverization and storage process (S43). A method for recycling fly ash containing heavy metals, characterized in that the powder from which heavy metals are removed by being circulated and transported through the air slide conveyor (AC) of the air supply fan 66 to supply external air is carried out (S44) . delete delete

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