CN217549041U - Equipment for collecting zinc powder in dust of steel plant - Google Patents
Equipment for collecting zinc powder in dust of steel plant Download PDFInfo
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- CN217549041U CN217549041U CN202221671916.6U CN202221671916U CN217549041U CN 217549041 U CN217549041 U CN 217549041U CN 202221671916 U CN202221671916 U CN 202221671916U CN 217549041 U CN217549041 U CN 217549041U
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Abstract
The utility model discloses a device for collecting zinc powder in dust of a steel plant, which comprises a condensing system, wherein the condensing system comprises a condensing collecting unit, a conveying unit, a storage unit and a negative pressure unit, the condensing collecting unit comprises a shell and a plurality of condensing pipes arranged in the shell at intervals, a conical collecting hopper is arranged at the bottom of the shell below each condensing pipe, the outlets of all the collecting hoppers are connected with the conveying unit, and the outlet storage unit of the conveying unit is connected with the condensing collecting hopper; a partition board is arranged between two adjacent condenser pipes in the shell, the upper end of the partition board is connected with the shell, and a dust circulation channel is reserved between the lower end of the partition board and the bottom of the shell; the one end of casing is equipped with the dust import, and the other end of casing is equipped with the dust export, and the dust can pass each condenser pipe in proper order and discharge from the dust export after getting into the casing from the dust import, the dust export with the negative pressure unit is connected. The zinc powder in the dust of the steel plant can be collected, the resource utilization of the dust of the steel plant is realized, and the harmfulness of the dust is reduced.
Description
Technical Field
The utility model belongs to the technical field of steel production, concretely relates to collect equipment of zinc powder in iron and steel factory dust.
Background
The dust generated in the steel production engineering mainly comprises sintering machine head electric dedusting ash, pellet dedusting ash, blast furnace gas ash (mud), steelmaking dedusting ash (mud) and the like. In the production process of blast furnace iron making, for solid waste generated in the dust removal process of a blast furnace, the solid waste collected by a dry bag-type dust collector is called gas ash, and the solid waste collected by a wet dust collector is called gas mud. Blast furnace gas ash (mud), which is recorded as blast furnace gas ash/mud, has complex chemical components and contains valuable metals such as zinc, lead, indium and the like besides iron elements. The zinc oxide powder produced by the process has low yield and long process flow, and cannot achieve the purpose of being rich in elemental metal. And the process flow has poor dynamic conditions and low efficiency. The generation of a large amount of solid wastes causes environmental pollution and resource waste. The zinc-containing solid waste in the steel plant mainly comes from dust and sludge generated by sintering, iron making, electric furnace steel making and the like. In the process of steel production, zinc-containing solid waste is increased due to the increase of the production amount of steel, the solid waste has toxicity hazards such as radioactivity and corrosivity, the solid waste is increased along with the increase of the production amount of steel, and the reduction of the solid waste is difficult to control, so that the solid waste not only has harm to the ecological environment, but also influences the life and health of people.
Disclosure of Invention
For solving the problem that exists among the prior art, the utility model aims to provide an equipment of collecting zinc powder in the iron and steel plant dust, the utility model discloses can collect the zinc powder in the iron and steel plant dust, carry out resource utilization and reduce its harm to the iron and steel plant dust.
The utility model adopts the technical scheme as follows:
a device for collecting zinc powder in dust of a steel plant comprises a condensation system, wherein the condensation system comprises a condensation collection unit, a conveying unit, a storage unit and a negative pressure unit, the condensation collection unit comprises a shell and a plurality of condenser pipes arranged in the shell at intervals, a conical collection hopper is arranged at the bottom of the shell below each condenser pipe, outlets of all the collection hoppers are connected with the conveying unit, and the outlets of the conveying unit are connected with the storage unit;
a partition board is arranged between two adjacent condensing pipes in the shell, the upper end of the partition board is connected with the shell, and a dust circulation channel is reserved between the lower end of the partition board and the bottom of the shell;
the one end of casing is equipped with the dust import, and the other end of casing is equipped with the dust export, and the dust can pass each condenser pipe in proper order and discharge from the dust export after getting into the casing from the dust import, the dust export with the negative pressure unit is connected.
Preferably, the condensation pipe is a coiled pipe.
Preferably, a vibrating screen is arranged in the collecting hopper.
Preferably, the outlet of the collecting hopper is provided with a butterfly valve for controlling blanking.
Preferably, the dust inlet and the dust outlet are disposed at the top of the housing.
Preferably, the dust inlet and the dust outlet are provided in the side wall of the housing.
Preferably, the conveying unit comprises a spiral conveyor, the bolt conveyor comprises a trough and a spiral connected with the trough, the trough is of a closed structure, the joint of the spiral and the trough is sealed, a plurality of feed inlets connected with outlets of each collecting hopper are formed in the trough, the feed inlets are connected with outlets of the collecting hoppers in a sealing mode, a discharge outlet is formed in the end portion of the spiral of the trough, and the discharge outlet is connected with the storage unit.
Preferably, the storage unit adopts a storage tank, and a discharge port of the trough is connected with the storage tank through a zinc powder pipe.
Preferably, the dust outlet is provided with a dust remover, and the negative pressure unit adopts a vacuum pump.
Preferably, the equipment of the utility model also comprises a vacuum regenerative furnace, wherein the smoke outlet of the vacuum regenerative furnace is connected with the dust inlet of the shell.
The utility model discloses following beneficial effect has:
the utility model discloses collect equipment of zinc powder in steel plant dust is through setting up condensing system, can condense, form zinc powder with the zinc steam in the dust to the realization is retrieved the zinc in the dust. Specifically, a plurality of condenser pipes are arranged in the shell of the condensing system at intervals, and a partition plate is arranged between every two adjacent condenser pipes, so that zinc-containing dust can be fully contacted with each condenser pipe through the blocking effect of the partition plate, the cooling effect is ensured, and zinc steam is condensed to form zinc powder; the zinc powder that forms can fall into the collection fill that the casing bottom set up in every condenser pipe below, collects and regularly discharges to the conveying unit through collecting the fill, and the transport through the conveying unit is stored in storage unit to this moment realized retrieving zinc powder from the dust. In addition, the negative pressure unit can provide power for the dust flowing in the shell.
Drawings
FIG. 1 is a schematic structural diagram of an apparatus for collecting zinc dust in steel plant dust according to the present invention;
fig. 2 is another schematic structural diagram of the device for collecting zinc powder in the dust of the steel plant.
In the figure, 1, a dust inlet; 2. a condenser tube; 3. a collecting hopper; 4. a zinc powder tube; 5. a dust outlet; 6-a separator; 7-vibrating screen; 8-spiral feeder.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and examples.
Referring to fig. 1 and 2, the utility model discloses collect equipment of zinc powder in steel plant dust, including condensing system, condensing system includes condensation collection unit, conveying unit, storage unit and negative pressure unit, conveying unit includes screw conveyor, storage unit adopts the holding vessel, negative pressure unit adopts the vacuum pump, take the embodiment shown in fig. 1 and 2 as an example, condensation collection unit includes that casing and interval set up two condenser pipes 2 in the casing, the quantity of condenser pipe 2 needs to be decided according to the temperature of dust, the temperature of guaranteeing dust outlet can not be too high, otherwise can lead to zinc powder to retrieve not thoroughly, condenser pipe 2 adopts the coiled pipe can, moreover, the steam-heat transfer area is great. The bottom of casing all is equipped with conical collection and fights 3 in the below of two condenser pipes 2, and the shape of collecting fighting 3 adopts circular cone or pyramid all can, and the preference is conical, can guarantee like this that zinc powder descends smoothly. The utility model discloses a bolt feeding conveyor includes silo and the spiral that is connected with the silo, the silo is a enclosed construction, the spiral is sealed with the junction of silo, be equipped with two feed inlets that link to each other with two above-mentioned exports of collecting fill 3 respectively on the silo, the feed inlet directly sets up under collecting the 3 exports of fighting, can conveniently collect the direct whereabouts of zinc powder in fighting like this to the spiral feeding conveyor in, prevent that zinc powder from piling up in dead angle department, feed inlet and collection are fought sealing connection between 3 exports, the silo is equipped with the discharge gate at spiral tip, the discharge gate of silo passes through zinc powder pipe 4 and is connected with the holding vessel. The collecting hopper 3 and the trough should be sealed to isolate oxygen and prevent zinc powder from oxidation. A partition plate 6 is arranged between two adjacent condensing pipes 2 in the shell, the upper end of the partition plate 6 is connected with the shell, and a dust circulation channel is reserved between the lower end of the partition plate 6 and the bottom of the shell; the baffle 6 will adopt thermal-insulated baffle to prevent the heat mutual transmission of baffle both sides, and make the dust condensation effect of baffle right side (low temperature side) not good, baffle 6 can adopt the great thermal insulation material of thermal resistivity or its inside cooling structure (like the cooling tube) of setting up all can, link to each other through their edge directly between the top of two collection fill 3, two collection fill 3 tops juncture can not form the platform structure and pile up zinc powder like this. The partition plate 6 is preferably arranged right above the junction of the tops of the two collecting hoppers 3, so that zinc powder blocked by the partition plate 6 can directly fall into the collecting hoppers 3, the phenomenon that the zinc powder is accumulated at the junction of the tops of the two collecting hoppers 3 is further prevented, the junction of the tops of the two collecting hoppers 3 is also the part with the smallest dust flowing section, the air speed is also the largest, and the phenomenon that the zinc powder is accumulated at the junction of the tops of the two collecting hoppers 3 can be further prevented. The one end of casing is equipped with dust import 1, and the other end of casing is equipped with dust outlet 5, and the dust can pass each condenser pipe 2 in proper order and discharge from dust outlet 5 after getting into the casing from dust import 1, dust outlet 5 with negative pressure unit connects, sets up the dust remover at dust outlet 5, can further catch zinc powder through the dust remover, both plays the effect of environmental protection and can also improve the rate of recovery of zinc powder to can also prevent that the dust from getting into in the vacuum pump.
In the utility model, a vibrating screen 7 is also arranged in the collecting hopper 3, and the vibrating screen 7 can give a vibrating action to the material outlet of the collecting hopper 3 to promote blanking; the solidified zinc powder is easy to form an explosive mixture with air along with the reduction of the solidification temperature of the zinc material by the condensation system, the retention time of the zinc powder in the funnel is reduced, the blockage of the zinc powder at the outlet of the collection hopper 3 is prevented due to the non-uniformity of the flow of the condensed zinc powder in the condensation system, and the generated zinc powder can be dredged by the vibrating screen 7 when being gathered at the outlet of the collection hopper 3; because the whole condensing system is a closed system, the vibrating screen 7 is an intermittent vibrating device, and the vibrating time is mainly judged by the discharging speed of the zinc materials at the outlet of the collecting hopper 3. In addition, the outlet of collecting hopper 3 is equipped with the butterfly valve of control blanking, can regularly discharge the zinc powder in collecting hopper 3 through the butterfly valve.
In the utility model, the arrangement form of the dust inlet 1 and the dust outlet 5 can adopt two forms as shown in fig. 1 and fig. 2, namely, the dust inlet 1 and the dust outlet 5 are arranged at the top of the shell; alternatively, the dust inlet 1 and the dust outlet 5 are provided in the side wall of the housing.
The utility model discloses well dust import 1's dust comes from the flue gas of vacuum regenerator after to zinciferous dust treatment.
The utility model discloses at the during operation, the working process goes on under the vacuum, and is less to personnel and environmental impact, and equipment is comparatively simple, and is safe controllable, and convenient operation can effectively realize drawing valuable metal and metallic iron oxide in the smoke and dust of steel plant, the utility model discloses the iron grade reaches more than 45% in the iron oxide that obtains, consequently the process flow that valuable metal was retrieved has been simplified to the method of this project, has improved the metal yield.
Taking recovered zinc metal as an example, firstly, after a raw material is made in an electric furnace, dust is treated by using a vacuum heat storage furnace, zinc in the dust is reduced into zinc steam, then smoke (containing the zinc steam) of the vacuum heat storage furnace is introduced from a dust inlet 1, a dust outlet 5 is vacuumized by using a vacuum pump to enable the smoke of the vacuum heat storage furnace to sequentially pass through each condensation pipe for heat exchange, crude zinc generated after the zinc-containing dust is condensed in the condensation pipe is extracted by the vacuum pump, and generated gases such as CO are extracted by the vacuum pump. The utility model discloses can effectively control the condenser pipe temperature and strengthen the rate of recovery of carrying zinc, create good thermodynamics and dynamics condition for carrying zinc.
The utility model discloses collect the equipment operation process of zinc powder in the dust of steel plant includes following step:
1) Extracting the components of the zinc-containing dust in an electric furnace, pelletizing and adding the oxygen content in the raw materials and the carbon powder into a vacuum heat storage furnace according to a proportion relation of 1-2, connecting a flue gas outlet of the vacuum heat storage furnace with a dust inlet 1 of the equipment, simultaneously opening a vacuum pump (the vacuum degree is within 100 pa) connected with a dust outlet 5, introducing the zinc-containing dust into the shell, and sequentially flowing through condensing pipes;
2) The zinc ferrite mineral formed after the raw materials are heated can be decomposed at high temperature, and the reduction stage of the zinc ferrite is as follows at about 1000 ℃: fe. ZnO 2 O 3 →ZnO+Fe 2 O 3 Adding a desulfurizing agent and a dechlorinating agent in the process of mixing the raw materials of → ZnO + FeO → ZnO + Fe → Zn + Fe, reducing the volatilization of sulfides and chlorides and improving the purity of the condensed zinc powder;
3) The cooling water scaling is noticed in the interior of the water pipe of the condensation pipe, and the temperature and hardness of the cooling water entering and exiting are controlled. The temperature of water inlet is less than or equal to 25 degrees, and the temperature of water outlet is less than or equal to 55 degrees. And a bag-type dust remover is arranged at the dust outlet 5, and the size of the bag-type dust remover is required to be adapted to the smoke gas volume of the system. The cloth bag dust removal mainly aims to meet the emission standard, the inlet temperature is preferably not more than 200 degrees, and the pressure head and the filtering area of a fan meet the requirements.
4) Zinc dust which contains zinc dust and reaches the reduction temperature through cooling of the condensation pipe sinks to the collecting hopper 3 and periodically enters the collecting tank from a material outlet of the collecting hopper 3, the spiral conveyor and the zinc dust pipe to be collected, and the rest gas is pumped out from the outlet through the vacuum pump. The recovery rate of zinc metal and the purity of the zinc metal are ensured through the condensation of a plurality of condensation pipes.
The utility model discloses the advantage has:
(1) Zinc vapour generated at high temperature. Can be cooled and condensed by CO in gas phase 2 Re-oxidizing to form blue powder (the surface of which is oxidized by zinc particles, generally containing 85-90% of zinc and 8-10% of ZnO), so that excessive carbon is added in the production process to ensure that CO consumed by the reduction reaction can be supplemented by the gasification reaction of the carbon; maintaining at a high temperature of above 1000 deg.C, in the presence of carbon, CO 2 Can be converted into CO in a short time; with excess carbon and having a large active surface to promote CO 2 Is sufficiently reduced, and is beneficial to cause strong reducing atmosphere.
(2) The activity of zinc oxide in the slag depends on the respective composition of the slag and to a large extent on the CaO and SiO therein 2 The content of (b). Increasing the CaO content helps to increase the activity of ZnO, since CaO is much more basic at high temperatures than ZnO, making it possible to convert ZnO from 2zno 2 Is replaced by SiO 2 The increase in the content is a disadvantage because it is strongly bonded to ZnO. However, the ZnO activity is also equal to that of FeO and Al in the raw material 2 O 3 The components are related;
(3) The shaft reduction coal has the characteristics of good coking property (G is more than or equal to 85), high fixed carbon, low ash content, high melting point, low sulfur content, proper volatile component, thick colloidal layer and the like. The combustible substances in the coking waste gas are generally burnt in a reburning chamber, and the high-temperature waste gas generated by burning is subjected to waste heat utilization by a waste heat boiler.
(4) The pretreatment process is not required to be added, and the raw material is directly dried by the waste heat of enterprises and is directly subjected to vacuum reduction treatment.
(6) The strength of the pellets in the vertical tank is high, and the skeleton of the pellets and the channel effect of gas emission are ensured.
(8) The heating scheme is optimized, the pre-burning at the temperature of about 800 ℃ can be carried out on the pellet after the pellet is made, the strength of the pellet is improved, and the bursting and pulverization of the pellet in the rapid heating process in the heating furnace are prevented.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described with reference to the following embodiments.
Example 1
1) Extracting components of zinc-containing dust in an electric furnace, pelletizing and adding oxygen content in raw materials and carbon powder into a vacuum system of the electric furnace according to a proportion relation of 1:1.2, introducing flue gas from a dust inlet 1 of the equipment, simultaneously opening the vacuum system to control a vacuum pump at 100pa, and introducing volatile elements in the zinc-containing dust into the equipment;
2) The temperature of zinc ferrite mineral formed after the raw materials are heated in a condensing system is about 1000 ℃, the heating and recycling system is started up at the same time, the heat is preserved for 2.5 hours, zinc metal volatilizes, the speed of the volatilized zinc vapor separating from slag charge can be accelerated due to the air pumping action of a vacuum system, and the volatilization of sulfide and chloride is reduced due to the addition of a desulfurizer and a dechlorinating agent in the process of mixing the raw materials, so that the purity of the condensed zinc powder can be improved;
3) The inside of the water pipe needs to be noticed with cooling water scaling, and the temperature and hardness of the cooling water inlet and outlet water are controlled. The water inlet temperature is less than or equal to 25 degrees, and the water outlet temperature is less than or equal to 55 degrees. The exit temperature of the flue gas is below 250 ℃ through the cold zone of the condensing system.
4) And finally, the zinc dust which is cooled to the reduction temperature by the condenser pipe sinks to the material outlet and enters the zinc dust pipe, and the rest gas is pumped out from the outlet by the vacuum pump. The recovery rate of zinc metal is ensured to be 85% purity through the condensation of a plurality of condensation pipes.
Example 2
1) Extracting components of zinc-containing dust in an electric furnace, pelletizing and adding oxygen content in raw materials and carbon powder into a vacuum system of the electric furnace according to a proportion relation of 1:1.5, introducing flue gas from a dust inlet 1 of the equipment, simultaneously opening the vacuum system to control a vacuum pump at 120pa, and introducing volatile elements in the zinc-containing dust into the equipment;
2) The temperature of zinc ferrite mineral formed after the raw materials are heated in a condensing system is about 1100 ℃, the heating and recycling system is started up at the same time, the heat is preserved for 2 hours, zinc metal volatilizes, the speed of the volatilized zinc vapor separating from slag charge can be accelerated due to the air pumping action of a vacuum system, and the volatilization of sulfides and chlorides is reduced due to the addition of a desulfurizer and a dechlorinating agent in the process of mixing the raw materials, so that the purity of the condensed zinc powder can be improved;
3) The inside of the water pipe needs to be noticed with cooling water scaling, and the temperature and hardness of the cooling water inlet and outlet water are controlled. The water inlet temperature is less than or equal to 25 degrees, and the water outlet temperature is less than or equal to 55 degrees. The exit temperature of the flue gas is lower than 300 ℃ through the cold zone of the condensing system.
4) And finally, the zinc dust which is cooled to the reduction temperature by the condensation pipe sinks to the material outlet and enters the zinc dust pipe, and the rest gas is pumped out from the outlet by the vacuum pump. Through the condensation of a plurality of condenser pipes, the recovery rate of zinc metal is ensured to be 95 percent of purity.
Example 3
1) Extracting components of zinc-containing dust in an electric furnace, pelletizing and adding oxygen content in raw materials and carbon powder into a vacuum system of the electric furnace according to a proportion relation of 1.5, introducing flue gas from a dust inlet 1 of the equipment, simultaneously opening the vacuum system to control a vacuum pump at 100pa, and introducing volatile elements in the zinc-containing dust into the equipment;
2) The temperature of zinc ferrite mineral formed after the raw materials are heated in a condensing system is about 1150 ℃, the heating and recovering system is started up at the same time, the heat is preserved for 2.5 hours, zinc metal volatilizes, the speed of volatilizing zinc vapor separating from slag charge can be accelerated due to the air pumping action of a vacuum system, and the volatilization of sulfide and chloride is reduced due to the addition of a desulfurizer and a dechlorinating agent in the raw material mixing process, so that the purity of the condensed zinc powder can be improved;
3) The inside of the water pipe needs to be noticed with cooling water scaling, and the temperature and hardness of the cooling water inlet and outlet water are controlled. The temperature of water inlet is less than or equal to 25 degrees, and the temperature of water outlet is less than or equal to 55 degrees. The exit temperature of the flue gas is lower than 320 ℃ through the cold zone of the condensing system.
4) And finally, the zinc dust which is cooled to the reduction temperature by the condensation pipe sinks to the material outlet and enters the zinc dust pipe, and the rest gas is pumped out from the outlet by the vacuum pump. Through the condensation of a plurality of condenser pipes, the recovery rate of zinc metal is ensured to be 92 percent of purity.
Example 4
1) Extracting components of zinc-containing dust in an electric furnace, pelletizing and adding oxygen content in raw materials and carbon powder into a vacuum system of the electric furnace according to a proportion relation of 1;
2) The temperature of zinc ferrite mineral formed after the raw material is heated in a condensing system is about 1120 ℃, the heating and recycling system is started up at the same time, the heat is preserved for 2.5 hours, zinc metal volatilizes, the speed of the volatilized zinc vapor separating from slag charge can be accelerated due to the air pumping action of a vacuum system, and the volatilization of sulfide and chloride is reduced due to the addition of a desulfurizer and a dechlorinating agent in the process of mixing the raw materials, so that the purity of the condensed zinc powder can be improved;
3) The inside of the water pipe needs to be noticed with cooling water scaling, and the temperature and hardness of the cooling water inlet and outlet water are controlled. The water inlet temperature is less than or equal to 25 degrees, and the water outlet temperature is less than or equal to 55 degrees. The exit temperature of the flue gas is lower than 300 ℃ through the cold zone of the condensing system.
4) And finally, the zinc dust which is cooled to the reduction temperature by the condensation pipe sinks to the material outlet and enters the zinc dust pipe, and the rest gas is pumped out from the outlet by the vacuum pump. Through the condensation of a plurality of condenser pipes, the recovery rate of zinc metal is ensured to be 90 percent of purity.
The results of the examples are shown in table 1:
TABLE 1
According to the change trend of table 1, the zinc content can not be effectively increased by increasing the heating temperature and prolonging the heat preservation time, the zinc volatilization temperature is reached at a temperature higher than 1000 ℃, the carbon ratio can increase the zinc reduction amount, the vacuum degree only influences the kinetic condition of zinc volatilization and recovery, and the recovery of zinc is accelerated when the vacuum degree is about 150pa compared with the vacuum degree. Because the cooling capacity of the cooling system is limited, the temperature of the outlet flue gas can be increased along with the increase of the heating temperature.
Claims (10)
1. The equipment for collecting zinc powder in dust in the steel plant is characterized by comprising a condensation system, wherein the condensation system comprises a condensation collection unit, a conveying unit, a storage unit and a negative pressure unit, the condensation collection unit comprises a shell and a plurality of condensation pipes (2) arranged in the shell at intervals, conical collection hoppers (3) are arranged at the bottom of the shell below each condensation pipe (2), outlets of all the collection hoppers (3) are connected with the conveying unit, and the outlets of the conveying unit are connected with the storage unit;
a partition plate (6) is arranged between two adjacent condensing pipes (2) in the shell, the upper end of the partition plate (6) is connected with the shell, and a dust circulation channel is reserved between the lower end of the partition plate (6) and the bottom of the shell;
the one end of casing is equipped with dust import (1), and the other end of casing is equipped with dust export (5), and the dust can pass each condenser pipe (2) and discharge from dust export (5) in proper order after getting into the casing from dust import (1), dust export (5) with the negative pressure unit is connected.
2. An apparatus for collecting zinc dust in steel and iron plant dust according to claim 1, characterized in that the condenser tube (2) is a serpentine tube.
3. An apparatus for collecting zinc dust in steel and iron plant dust, according to claim 1, characterized in that the collecting hopper (3) is provided with a vibrating screen (7).
4. An apparatus for collecting zinc dust in steel and iron plant dust according to claim 1, characterized in that the outlet of the collecting hopper (3) is provided with a butterfly valve for controlling the blanking.
5. An apparatus for collecting zinc dust in steel and iron plant dust according to claim 1, characterized in that the dust inlet (1) and the dust outlet (5) are placed at the top of the shell.
6. An apparatus for collecting zinc dust in steel and iron plant dust according to claim 1, characterized in that the dust inlet (1) and the dust outlet (5) are arranged in the side wall of the shell.
7. The apparatus for collecting zinc dust from iron and steel plant dust according to claim 1, wherein the conveying unit comprises a screw conveyor, the screw conveyor comprises a trough and a screw connected with the trough, the trough is of a closed structure, the connection between the screw and the trough is sealed, the trough is provided with a plurality of feeding ports respectively connected with the outlet of each collecting hopper (3), the feeding ports are connected with the outlet of the collecting hopper (3) in a sealing manner, the trough is provided with a discharging port at the end of the screw, and the discharging port is connected with the storage unit.
8. The equipment for collecting zinc powder in iron and steel plant dust according to claim 7, characterized in that the storage unit is a storage tank, and the discharge port of the trough is connected with the storage tank through a zinc powder pipe (4).
9. An apparatus for collecting zinc dust in steel and iron plant dust according to claim 1, characterized in that the dust outlet (5) is provided with a dust collector and the negative pressure unit is a vacuum pump.
10. The equipment for collecting zinc dust in steel plant dust according to claim 1, further comprising a vacuum regenerator, wherein the flue gas outlet of the vacuum regenerator is connected with the dust inlet (1) of the shell.
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