CN215141906U - Device for removing heavy metal in fly ash - Google Patents

Abstract

The utility model discloses a heavy metal remove device in flying dust, including the vibration sorting unit, STREAMING sorting unit and the static sorting unit who connects gradually, STREAMING sorting unit includes: the fluidization chamber is provided with a first screening part for screening the fluid layer and the primary fine ash which is not fluidized, and a fluid layer for fluidizing the primary fine ash screened by the vibration screening device is laid above the first screening part to obtain secondary fine ash; and a gas delivery assembly disposed below the fluid layer for blowing gas into the fluidizing chamber. By applying the device, the particle size of the fly ash is screened in a multistage sorting mode of vibration screening, flow type screening and electrostatic screening, so that the precision and the accuracy are improved, and the fly ash can be screened to be below 10 micrometers; heavy metals are removed in a physical mode, no chemical reagent is needed, secondary pollution is avoided, the process is simple, and the cost is low; the coarse ash and the fine ash obtained after screening at all levels can be directly utilized, and the gradient utilization of the fly ash is realized.

Description

Device for removing heavy metal in fly ash

Technical Field

The utility model relates to a chemical industry equipment field, more specifically say, relate to a heavy metal remove device in flying dust.

Background

The fly ash is fine fly ash particles in flue gas after coal combustion, and is one of the most main bulk industrial solid wastes in China. Besides elements such as silicon, calcium, iron and aluminum, the fly ash also contains trace heavy metal elements such as chromium, mercury, lead, cadmium, copper and zinc, and has certain toxicity. These heavy metals are all derived from coal and are concentrated in the fly ash during the combustion of the coal, especially in the fine particulate fraction. This is because some heavy metal elements are vaporized into metal vapor during high-temperature combustion, and are easily adsorbed on the surface of the submicron-order fly ash as the temperature decreases. The existence and leaching migration of heavy metals in the fly ash can cause natural environment pollution and influence animal and plant as well as human health.

At present, the treatment methods aiming at heavy metals include a chemical method, an electrochemical method, a microbiological method and the like. The chemical method firstly uses an acidic solution to dissolve heavy metal elements in the solid waste, and then removes heavy metal ions in the solution through precipitation. The electrochemical method is to reduce metal cations in a solution into a metal simple substance through an electrolytic reaction, so as to realize metal removal, recovery and reuse. The microbiological method utilizes tolerant microorganisms to immobilize metal ions in microbial cells or on extracellular matrices by bioadsorption or biotransformation.

All three heavy metal treatment methods require liquid phase reactions. For solid waste, these processes first transfer the heavy metals in the solid to solution by dissolution for further processing. Therefore, the traditional heavy metal removal process is complex, high in cost and easy to generate secondary pollution, and a solution for separating heavy metals from a solid phase directly does not exist.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model aims at providing a heavy metal remove device in flying dust to realize getting rid of heavy metal in the flying dust through physical method, need not chemical reagent, no secondary pollution such as waste water produces, gets rid of simple process.

In order to achieve the first object, the present invention provides the following technical solutions:

the device for removing the heavy metals in the fly ash comprises a vibration sorting device, a flow type sorting device and an electrostatic sorting device which are sequentially connected, wherein the flow type sorting device comprises:

the fluidization chamber is provided with a first screening part for screening the fluid layer and the non-fluidized primary fine ash at the bottom, and a fluid layer for fluidizing the primary fine ash screened by the vibration screening device is laid above the first screening part to obtain secondary fine ash;

and the gas conveying assembly is arranged below the fluid layer and used for blowing gas into the fluidizing chamber.

Preferably, the flow sorting apparatus further comprises:

the switching bin is provided with a feeding hole connected with the vibration sorting device and is sleeved outside the fluidization chamber;

the conveying component is used for conveying the first-stage fine ash, one end of the conveying component is arranged in the switching bin, and the other end of the conveying component is arranged in the fluidizing chamber.

Preferably, the sidewall of the fluidization chamber is provided with a conveying hole which penetrates along the wall thickness direction, and a material brushing component which is arranged at the conveying hole and brushes the first-stage fine ash on the conveying component.

Preferably, the material brushing component is made of elastic material.

Preferably, the conveying assembly is a conveying chain and a power part connected with the conveying chain;

the conveying holes comprise a first conveying hole and a second conveying hole which are arranged on the side wall of the fluidization chamber from top to bottom, and the material brushing assemblies are arranged at the first conveying hole and the second conveying hole respectively.

Preferably, the conveying member is a conveyor belt/conveyor chain.

Preferably, the gas delivery assembly comprises:

the air pump and with the delivery line that the air pump is connected, delivery line with the one end that first sieve spare is relative is equipped with the flaring portion that the diameter is crescent.

Preferably, the vibratory sorting apparatus comprises:

the screening box comprises an original ash feeding port, a primary coarse ash discharging port and a primary fine ash discharging port, and the primary fine ash discharging port is connected with the flow type sorting device;

a vibrating member connected to the screen box;

the support is used for supporting the sieve box, and a damping piece is arranged between the support and the sieve box.

Preferably, the electrostatic sorting apparatus comprises:

a charger for charging the second-level fine ash;

the plurality of stages of impactors are sequentially connected in series from top to bottom and used for collecting charged secondary fine ash, and an insulating collection layer is arranged between every two adjacent impactors;

a vacuum pump connected to the charger and all of the strikers.

Preferably, the electrostatic sorting apparatus further comprises:

and the electronic measuring component is used for monitoring the total charge of the particles on any stage of the impactor in real time.

The utility model provides a heavy metal remove device in flying dust, including the vibration sorting unit, STREAMING sorting unit and the static sorting unit who connects gradually, STREAMING sorting unit includes: the fluidization chamber is provided with a first screening part for screening a fluid layer and non-fluidized primary fine ash at the bottom, and a fluid layer for fluidizing the primary fine ash screened by the vibration screening device is laid above the first screening part to obtain secondary fine ash; and a gas delivery assembly disposed below the fluid layer for blowing gas into the fluidizing chamber.

Compare in prior art, use the utility model provides a heavy metal remove device in flying dust has following technological effect:

firstly, the method screens the particle size of the fly ash in a multistage sorting mode of vibration screening, flow type screening and electrostatic screening, improves the precision and the accuracy, and can screen the fly ash to be below 10 microns;

secondly, heavy metals are removed in a physical mode, and no chemical reagent is needed, so that secondary pollution such as waste water and the like is avoided, the process is simple, and the cost is low; meanwhile, the coarse ash and the fine ash obtained after screening at each stage can be directly utilized, and the cascade utilization of the fly ash is realized.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a device for removing heavy metals from fly ash according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a vibratory sorting apparatus according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a flow-type sorting device according to an embodiment of the present invention.

The drawings are numbered as follows:

a vibration sorting device 1, a flow sorting device 2, and an electrostatic sorting device 3;

the device comprises a raw ash feeding port 11, a second screening part 12, a screening box 13, a damping part 14, a bracket 15, a vibrating part 16, a force guide plate 17, a first-level fine ash discharging port 18, a first-level coarse ash discharging port 19 and a support 110;

a secondary fine ash outlet 21, a fluidizing chamber 22, a conveying assembly 23, a fluid layer 24, a flaring portion 25, a material brushing assembly 26, a rotating disc 27, a switching bin 28 and a cover plate 29.

Detailed Description

The embodiment of the utility model discloses heavy metal remove device in flying dust to realize getting rid of heavy metal in the flying dust through physical method, need not chemical reagent, secondary pollution such as no waste water produces, gets rid of simple process.

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1-3, fig. 1 is a schematic structural diagram of a device for removing heavy metals from fly ash according to an embodiment of the present invention; fig. 2 is a schematic structural diagram of a vibratory sorting apparatus according to an embodiment of the present invention; fig. 3 is a schematic structural diagram of the flow-type sorting device 2 according to an embodiment of the present invention.

In a specific embodiment, the utility model provides a heavy metal remove device in flying dust, including vibration sorting unit 1, STREAMING sorting unit 2 and the electrostatic separation device 3 that connect gradually, it can be understood that each sorting unit's discharge gate connects gradually, and each device is preferred carries out the transport of flying dust through pneumatic means, like negative pressure suction device or air pump isotructure, can set up according to prior art. The method removes heavy metals in the solid waste by means of vibration separation, flow separation and electrostatic separation, reduces the content of the heavy metals in the fly ash, does not need chemical reagents, does not generate waste water and secondary pollution, and is simple in process, economical and environment-friendly.

When using, vibration sorting unit 1 sieves former ash, obtain the thick ash of one-level and the thin ash of one-level after the screening, the thin ash of one-level gets into to STREAMING sorting unit 2 and sieves, obtain the thick ash of second grade and the thin ash of second grade through STREAMING sorting unit 2, the thin ash of second grade is carried and is sieved in electrostatic separation device 3 and obtain tertiary thick ash and tertiary thin ash, tertiary thin ash particle diameter is little, the amount is few but heavy metal content is high, need separate out alone and handle, the thick ash of one-level, heavy metal content is low in the thick ash of second grade and the tertiary thick ash, can directly carry out the comprehensive utilization.

The flow-type sorting device 2 comprises a fluidizing chamber 22 and a gas conveying assembly 23, wherein the fluidizing chamber 22 is preferably provided with a cylindrical barrel or a barrel with other shapes, the diameter of the barrel is preferably set to be 5.1cm, the barrel can be set as required in other embodiments, the fluidizing chamber 22 is provided with a hollow cavity, and the gas conveying assembly 23 is arranged in a bottom air chamber of the fluidizing chamber 22 and is communicated with the hollow cavity, and blows air from bottom to top. The bottom of the fluidization chamber 22 is provided with a first screening member for screening the fluid layer 24 and the non-fluidized primary fine ash, which is disposed above the gas delivery assembly 23 and separates the air chamber from the fluidization chamber 22 for dispersing the gas flow; because the whole device keeps stable wind blowing, small particles are easily blown back into the fluidized layer and cannot fall into the air chamber and the pipeline below. A fluid layer 24 for fluidizing the primary fine ash screened by the vibration screening device is laid above the first screening part, the primary fine ash enters the fluidizing chamber 22 and forms tiny bubbles in the fluid layer 24, the fine ash is blown out of the fluid layer 24 under the action of high-speed airflow due to the fact that the density of the fine ash is lower than that of the fluid layer 24, the fine ash with the particle size of less than 10 micrometers is blown out of an outlet above the fluidizing layer and enters the electrostatic sorting device 3 according to the gas-solid fluidization principle, the fine ash with the particle size of more than 10 micrometers is left below the fluidizing chamber 22, and the fluid layer 24 and the secondary coarse ash can be separated through the first screening part to obtain secondary fine ash. The first screen is preferably a 250 mesh nylon mesh, and is removably secured to the fluidization chamber 22, such as by threaded fasteners. It will be appreciated that the particle diameter of the fluid layer 24 is greater than the screening diameter of the first screening member and the particle diameter of the first stage fine ash, respectively, and that the fluid layer 24 is preferably provided as a layer of copper bead micropowder, having a thickness of between 1.5 and 2.0cm,

the air delivery assembly 23 generally consists of an air pump and an air line having an outlet opposite the first sifter and through which the air flow is dispersed.

Compare in prior art, use the utility model provides a heavy metal remove device in flying dust has following technological effect:

firstly, the method screens the particle size of the fly ash in a multistage sorting mode of vibration screening, flow type screening and electrostatic screening, improves the precision and the accuracy, and can screen the fly ash to be below 10 microns;

secondly, heavy metals are removed in a physical mode, and no chemical reagent is needed, so that secondary pollution such as waste water and the like is avoided, the process is simple, and the cost is low; meanwhile, the coarse ash and the fine ash obtained after screening at each stage can be directly utilized, and the cascade utilization of the fly ash is realized.

Specifically, the flow sorter 2 further includes a transfer bin 28 and a transport assembly 23. Wherein, the switching bin 28 is provided with a feeding hole connected with the vibration sorting device 1 for receiving the first-grade fine ash sorted by the vibration sorting device 1, and the conveying assembly 23 conveys the first-grade fine ash from the switching bin 28 into the fluidization chamber 22. The switching bin 28 is sleeved outside the fluidizing chamber 22 to receive the fallen first-stage fine ash so as to prevent environmental pollution; a cover plate 29 for covering the feed inlet is arranged above the switching bin 28 so as to further prevent the environment from being polluted and reduce the influence of dust on operators. Conveying assembly 23 can be by conveyer belt/carry chain and power component to constitute, and power component such as the motor in other embodiments, also can set up conveying assembly 23 as required, all be in the utility model discloses a protection scope.

Furthermore, in order to prevent the excessive powder from entering the fluidization chamber 22 by the conveying assembly 23 and affecting the fluidization effect, a conveying hole penetrating along the wall thickness direction is formed on the sidewall of the fluidization chamber 22, and a material brushing assembly 26 is disposed at the conveying hole and brushes the first-stage fine ash on the conveying assembly 23. It is understood that when the conveying component 23 is a conveying belt or a conveying chain, the number of the conveying holes is two, and the conveying belt is taken as an example for illustration, and the conveying holes are respectively matched with the first layer belt and the second layer belt of the conveying belt to realize the circular conveying of the conveying belt. The shape of the conveying hole is preferably a strip-shaped hole and can be set according to the shape of the conveying belt. The material brushing assembly 26 is preferably configured as a brush, a scraper, etc. to sweep or smooth the first-stage fine ash on the conveying assembly 23, reduce the material feeding of the fluidizing chamber 22, and optimize the fluidizing effect. Specifically, the flash assembly 26 is made of an elastic material, such as rubber, silicone, plastic or other known elastic materials, and in one embodiment, the flash assembly 26 is preferably configured as a rubber sheet.

In this embodiment, the conveying assembly 23 is a conveying chain and a power member connected with the conveying chain; or the conveying part is a conveying belt, the power part is a motor, preferably, the motor drives the turntable 27 to rotate, and the conveying chain is sleeved on the turntable 27. The conveying holes comprise a first conveying hole and a second conveying hole which are arranged on the side wall of the fluidization chamber 22 from top to bottom, conveying chains respectively penetrate through the first conveying hole and the second conveying hole to perform rotary motion, a material sweeping component 26 is respectively arranged at the first conveying hole and the second conveying hole, the material sweeping component 26 is arranged at the upper edge of the first conveying hole to work on the upper surface of the conveying chains, the material sweeping component 26 at the second conveying hole is arranged at the upper edge to sweep the conveying chains out of the fluidization chamber 22 to prevent the materials from being carried out, and in another embodiment, the material sweeping component 26 is preferably respectively arranged at the upper edge and the lower edge of the first conveying hole and the second conveying hole to improve the material sweeping effect.

Specifically, the gas delivery assembly 23 includes an air pump and a delivery pipeline connected to the air pump, and an end of the delivery pipeline opposite to the first sieving member is provided with a flared portion 25 with a gradually increasing diameter, so that the diameter of the flared portion 25 is gradually increased, the maximum diameter of the flared portion preferably matches with the inner diameter of the cylinder, the flared portion 25 is preferably provided with a hemispherical flared portion 25 or a conical flared portion 25, and preferably, the conical angle of the conical flared portion 25 is 30 °.

On the basis of the above-described embodiments, the vibratory sorting apparatus 1 includes:

the screening box 13 and the second screening part 12 arranged in the screening box 13, the screening box 13 comprises an original ash feeding port 11, a first-level coarse ash discharging port 19 and a first-level fine ash discharging port 18, and the first-level fine ash discharging port 18 is connected with a feeding port of a switching bin 28 of the flow type sorting device 2; the vibrating piece 16 is connected with the screen box 13, and the vibrating piece is connected 17 with the screen box through a force guide plate; the support 110 is used for supporting the screen box 13, the support 110 is provided with a bracket 15 on two sides, and the bracket 15 is provided with a damping piece 14. The vibrating elements 16 are vibrating motors, preferably two vibrating motors, which are arranged in parallel and selected in opposite directions along the width direction of the screen box 13, the resultant direction of the generated vibration is perpendicular to the axial direction of the motors, so that the overall motion track of the vibrating sorting device 1 is a straight line, preferably, the two vibrating motors have an inclination angle, such as 45-60 degrees, relative to the horizontal plane, so that the powder can jump forwards or move linearly on the screen surface to separate powder with different particle sizes, the powder enters from the raw ash inlet 11, the first-stage fine powder after being screened is discharged from the first-stage fine ash outlet 18, and the first-stage coarse ash is discharged from the first-stage coarse ash outlet 19. Wherein, the sieve case 13 is composed of stainless steel welded plates, the second sieving piece 12 is a 275-mesh stainless steel sieve, and the sieve surface area is preferably 500mm multiplied by 2500 mm. A damping member 14 is arranged between the support 110 and the screen box 13, and the damping member 14 is a damping spring which is arranged above the support 110 and below the screen box 13 and is vertical to the ground to support the screen box 13.

In addition to the above embodiments, the electrostatic sorting apparatus 3 includes:

a charger for charging the second-level fine ash;

the plurality of stages of the impactors are sequentially connected in series from top to bottom for collecting the charged secondary fine ash, and an insulating collection layer is arranged between every two adjacent impactors;

a vacuum pump connected to the charger and all of the strikers;

and the electronic measuring component is used for monitoring the total charge of the particles on any one stage of impactor in real time.

The electrostatic separation device 3 is composed of a multistage series impactor, a charging device, a vacuum pump and a multi-channel electronic measuring meter. The charger is a diode charger, the working voltage is 5kV, and tungsten wire electrodes are adopted for corona discharge. The multistage series connection impinger has 13 stages in total, and all stages are insulated from each other. The electronic measurement component can detect the total number of charges carried by particles on each stage of impactor in real time, and further can reflect the number of fly ash particles on each stage of impactor in real time. The vacuum pump is used for forming vacuum atmosphere in each stage of the impactor and the charger.

In a specific embodiment, raw ash is placed into the vibration sorting device 1 to be screened, the second screening part 12 is a 275-mesh screen, the vibration frequency is kept to be 1000 times/minute, the vibration screening time is 15-20 minutes, unscreened ash is discharged from the primary coarse ash discharge port 19, the particle size of particles is larger than 50 micrometers, and screened ash is discharged from the primary fine ash discharge port 18, and the particle size is smaller than 50 micrometers;

the first-stage fine ash is conveyed into a transfer bin 28 of a flow type sorting device 2, the first-stage fine ash in the transfer bin 28 is adsorbed on a conveying chain and enters a fluidization chamber 22 (the diameter is 5.1 cm), a layer of copper bead micro powder (the diameter is 100 microns) with the thickness of 1.5-2.0cm is paved in the fluidization chamber 22, a first screening piece is a nylon net with the mesh of 250 meshes so as to separate the fluidization chamber 22 from a wind chamber, the second-stage fine ash with the particle size smaller than 10 microns is blown out from a second-stage fine ash discharge port 2121 above the fluidization chamber 22 and enters a next-stage electrostatic sorting device 3, the second-stage coarse ash with the particle size larger than 10 microns is left below the fluidization chamber 22, and the copper bead micro powder and the second-stage coarse ash are separated through the first screening piece; wherein, the running parameter of the flow type sorting device 2 is that the chain speed is 1.2-36mm³The air flow speed of the compressed air is 9-30L/min;

and conveying the secondary fine ash in the flow type sorting device 2 to an electrostatic sorting device 3 for further sorting through pneumatic conveying. The secondary fine ash is first charged in the charger of the electrostatic classifier 3 and then collected in the impactor according to the aerodynamic particle size. The impactor is divided into 13 stages according to different particle sizes, and the stages are separated through an insulating collection layer (polycarbonate film). The charged fly ash is collected in the corresponding impactor insulation layer according to the aerodynamic particle size. The impactor is used for measuring the current generated by collecting the fly ash through a high-precision electronic measuring meter, the current of each stage is in direct proportion to the number of collected particles, and therefore the collection amount can be calculated through the current value. The higher the number of stages in the impactor, the larger the particle size. The closest to the charge chamber is the 13 th stage, and the lowest layer is the 1 st stage. The fly ash collected in grade 1-11 is called three-level fine ash (d <6.6 microns), and the fly ash collected in grade 12-13 is called three-level coarse ash (10 microns > d >6.6 microns). After precise separation, the fine ash has small particle size and small amount but high heavy metal content and needs to be separated out separately for treatment; the heavy metal element content in the first-level coarse ash, the second-level coarse ash and the third-level coarse ash is reduced, so that the comprehensive utilization can be directly carried out.

The device completely adopts a physical mode to separate heavy metals in the fly ash, and no chemical reagent is needed, so that no secondary pollution such as waste water is generated; the solid waste is directly subjected to heavy metal removal, and heavy metal elements do not need to be dissolved or leached, so that the process is simpler, and the cost is reduced; the coarse ash with lower heavy metal content can be directly utilized, and the fine ash part with higher heavy metal content can be used as ultrafine powder and can also be applied to rubber, plastics and coatings for high-value utilization, so that the gradient utilization of the fly ash is realized.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. The device for removing the heavy metals in the fly ash is characterized by comprising a vibration sorting device, a flow-type sorting device and an electrostatic sorting device which are sequentially connected, wherein the flow-type sorting device comprises:

the fluidization chamber is provided with a first screening part used for screening a fluid layer and primary fine ash which is not fluidized, and the fluid layer used for fluidizing the primary fine ash screened by the vibration screening device is laid above the first screening part to obtain secondary fine ash;

and the gas conveying assembly is arranged below the fluid layer and used for blowing gas into the fluidizing chamber.

2. The fly ash heavy metal removal apparatus of claim 1, wherein the flow sorting apparatus further comprises:

the switching bin is provided with a feeding hole connected with the vibration sorting device and is sleeved outside the fluidization chamber;

the conveying component is used for conveying the first-stage fine ash, one end of the conveying component is arranged in the switching bin, and the other end of the conveying component is arranged in the fluidizing chamber.

3. The device for removing heavy metals from fly ash according to claim 2, wherein the sidewall of the fluidizing chamber is provided with a conveying hole penetrating in the wall thickness direction, and a material brushing member disposed at the conveying hole for brushing the first-stage fine ash on the conveying member.

4. The fly ash heavy metal removal apparatus of claim 3, wherein the flash member is made of an elastic material.

5. The device for removing heavy metals in fly ash according to claim 3, wherein the conveying assembly is a conveying chain and a power member connected with the conveying chain;

the conveying holes comprise a first conveying hole and a second conveying hole which are arranged on the side wall of the fluidization chamber from top to bottom, and the material brushing assemblies are arranged at the first conveying hole and the second conveying hole respectively.

6. A fly ash heavy metal removal apparatus as claimed in claim 5, wherein said conveyor assembly is a conveyor belt/conveyor chain.

7. An apparatus for removing heavy metals from fly ash according to claim 1, wherein the gas delivery assembly comprises:

the air pump and with the delivery line that the air pump is connected, delivery line with the one end that first sieve spare is relative is equipped with the flaring portion that the diameter is crescent.

8. An apparatus for removing heavy metals from fly ash according to any one of claims 1 to 7, wherein the vibratory separator comprises:

the screening box comprises an original ash feeding port, a primary coarse ash discharging port and a primary fine ash discharging port, and the primary fine ash discharging port is connected with the flow type sorting device;

a vibrating member connected to the screen box;

the support is used for supporting the sieve box, and a damping piece is arranged between the support and the sieve box.

9. An apparatus for removing heavy metals from fly ash according to any one of claims 1 to 7, wherein the electrostatic separation apparatus comprises:

a charger for charging the second-level fine ash;

the plurality of stages of impactors are sequentially connected in series from top to bottom and used for collecting charged secondary fine ash, and an insulating collection layer is arranged between every two adjacent impactors;

a vacuum pump connected to the charger and all of the strikers.

10. The fly ash heavy metal removal apparatus of claim 9, wherein the electrostatic sorting apparatus further comprises:

and the electronic measuring component is used for monitoring the total charge of the particles on any stage of the impactor in real time.

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