CN115109935A - Zinc-containing dust treatment system for steel smelting and use method thereof - Google Patents
Zinc-containing dust treatment system for steel smelting and use method thereof Download PDFInfo
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- CN115109935A CN115109935A CN202111196615.2A CN202111196615A CN115109935A CN 115109935 A CN115109935 A CN 115109935A CN 202111196615 A CN202111196615 A CN 202111196615A CN 115109935 A CN115109935 A CN 115109935A
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- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
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- C22B1/005—Preliminary treatment of scrap
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
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- C22B19/30—Obtaining zinc or zinc oxide from metallic residues or scraps
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Abstract
The invention discloses a zinc-containing dust treatment system for steel smelting, which comprises a pneumatic conveying device, a specific gravity magnetic separation device, a vibration device, a cyclone recovery device and a microwave vacuum dezincification device, and belongs to the technical field of comprehensive utilization of solid wastes in steel metallurgy. The method for treating the zinc-containing dust by using the zinc-containing dust treatment system mainly comprises dust conveying, specific gravity magnetic separation and microwave vacuum dezincification. Separating and recovering carbon-containing materials with lighter specific gravity and magnetic iron-containing materials with heavier specific gravity in the zinc-containing dust by a physical method (specific gravity magnetic separation device), and concentrating the high-zinc materials; the high-zinc material is subjected to microwave vacuum dezincification and dezincification to obtain a blocky iron-containing material and zinc powder, so that valuable resources of Fe, Zn and C in the zinc-containing dust are reasonably separated, extracted and recovered. The zinc-containing dust treatment system and the using method have the characteristics of high efficiency, low cost and no secondary pollution.
Description
Technical Field
The invention relates to the technical field of comprehensive utilization of ferrous metallurgy solid wastes, in particular to a zinc-containing dust treatment system for steel smelting and a using method thereof.
Background
In the smelting process of iron and steel enterprises, dust is collected by a dry dust collection system, for example, a great amount of blast furnace gas (also called gas) is generated from the top of a blast furnace in the smelting process of the blast furnace, and a great amount of dust is generated in the blast furnace gas. In the process of recovering blast furnace gas, gravity and a dry cloth bag are usually used for dust removal, dust with thicker particles obtained by using gravity dust removal can be directly returned to the raw material for sintering for recycling, and fine particle dust obtained by cloth bag dust removal is blast furnace dry dust removal ash. The blast furnace dry method dust removal ash contains coal powder, coke powder, zinc element, iron-containing substances and the like, and because the raw materials and fuel levels of various blast furnaces are different, the blast furnace dry method dust contains harmful elements such as zinc, lead, arsenic and the like, the dust is collected in a dust removal system, and the dust has the characteristics of fine granularity, light weight, small density and the like, particularly, the dust with higher zinc content cannot be directly sintered back to become solid waste which seriously pollutes the environment, and if the dust with high zinc content is not recycled, the waste of valuable metal element resources in the dust can be caused. For example, in the field of steel smelting, similar blast furnace dry dedusting systems also exist in steel making dry dedusting ash and electric furnace dry dedusting ash, and the dedusting ash contains available resources such as coal dust, zinc elements, iron-containing substances and the like.
Fe, Zn and C in the dry-process dust are valuable resources, and the reasonable recycling of Fe, Zn and C in the dry-process dust becomes an important subject in the technical field of the comprehensive utilization of ferrous metallurgy solid wastes. The current process for treating dry-process dust mainly comprises a physical method, a wet method, a fire method and the like, wherein the physical method is simple and easy to implement, but brings about the cyclic enrichment of harmful elements of zinc in the production process of a blast furnace, the generation of furnace accretions, the damage to a furnace lining of the blast furnace, the influence on the normal production of the blast furnace and even the influence on the service life of the blast furnace; the leaching rate of the wet method is high, but the new secondary pollution is easily caused, and the method is not matched with the prior art of steel plants: the fire method (rotary kiln and rotary hearth furnace) has large investment, high cost and serious pollution. Therefore, reasonable processes are sought at home and abroad for separating and extracting Fe, Zn and C from the blast furnace dry-process dust. Therefore, the development and research of the metallurgical zinc-containing dust treatment process with high efficiency, low cost and less pollution are always the targets pursued by metallurgists and are the problems to be solved urgently in the whole steel industry.
Disclosure of Invention
The invention aims to provide a zinc-containing dust treatment system for steel smelting, which has high efficiency, low cost and less pollution, so that Fe, Zn and C in dry-process dust are reasonably separated, extracted and recovered.
In order to solve the above problems, the present invention provides a blast furnace dry method zinc-containing dust treatment system, comprising:
the pneumatic conveying device is used for conveying the dry-method dedusting ash;
the specific gravity magnetic separation device is used for separating carbon-containing materials, iron-containing materials and high-zinc mixed materials;
the vibrating device is used for assisting the specific gravity magnetic separation device to separate materials;
the cyclone recovery device is used for assisting the specific gravity magnetic separation device to recover the carbon-containing materials;
at least one microwave vacuum dezincification device for separating zinc from the high-zinc mixture;
the pneumatic conveying device is connected with the feeding end of the specific gravity magnetic separation device, the vibrating device is connected with the specific gravity magnetic separation device, and the specific gravity magnetic separation device comprises three discharging ends: the first discharge end is used for outputting iron-containing materials; the second discharge end is connected with the feed end of the cyclone recovery device and is used for outputting carbon-containing materials; and the third discharge end is connected with the feed end of the microwave vacuum dezincification device and is used for outputting high-zinc materials.
Compared with the technology of processing the dry dedusting ash by a physical method, a wet method and a fire method which are commonly adopted in the prior art, the invention has the following beneficial effects:
1. separating and recovering carbon-containing materials with lighter specific gravity and magnetic iron-containing materials with heavier specific gravity in the dry dedusting ash by a physical method (specific gravity magnetic separation device), and concentrating high-zinc materials; separating and dezincifying the high-zinc material by a microwave vacuum dezincification device to obtain an iron-containing material and zinc powder, so that valuable resources of Fe, Zn and C in the blast furnace dry dedusting ash can be reasonably separated, extracted and recovered;
2. due to the adoption of the microwave vacuum dezincification device, the dry method dedusting ash treatment process has the characteristics of high efficiency, low cost and no secondary pollution, and the problems of large recovery investment, high cost, serious pollution and the like of the 'pyrogenic dezincification' in the industry are thoroughly solved.
Preferably, the zinc-containing dust treatment system for steel smelting further comprises a first waste heat recovery device and a second waste heat recovery device, the first waste heat recovery device and the second waste heat recovery device are respectively connected with the microwave vacuum dezincification device, and the first waste heat recovery device is used for cooling and recovering zinc-containing gas and recovering and recycling waste heat; and the waste heat recovery device is used for cooling and recovering high-temperature iron-containing materials and recycling waste heat. Cooling the high-temperature zinc-containing gas to form zinc powder through the first waste heat recovery device, so that the collection of metal zinc is facilitated; and the high-temperature iron-containing material is cooled to form solid metal iron through the waste heat recovery device II, so that the metal iron can be conveniently collected. And the waste heat of the materials in the waste heat circulating device I and the waste heat circulating device II is recycled, so that energy and cost can be saved.
Preferably, the zinc-containing dust treatment system for steel smelting further comprises a waste heat power generation device, wherein the waste heat power generation device is respectively connected with the first waste heat recovery device and the second waste heat recovery device and is used for generating power by utilizing waste heat of materials in the first waste heat recovery device and the second waste heat recovery device; the waste heat power generation device converts the waste heat energy into electric energy, thereby realizing the reutilization of energy, further saving the energy and simultaneously reducing the treatment cost of zinc-containing dust in the steel smelting.
Preferably, the zinc-containing dust treatment system for steel smelting further comprises a hot-press forming device for pressing iron-containing material pressing blocks in different shapes, the feed end of the hot-press forming device is connected with the microwave vacuum dezincification device, and the discharge end of the hot-press forming device is connected with the waste heat recovery device II. Through the hot briquetting device, can directly process into required shape with the iron-bearing material according to actual need, avoid carrying out the process of secondary heating to the iron-bearing material, also practiced thrift the energy.
Preferably, the zinc-containing dust treatment system for steel smelting further comprises a screw quantitative feeder for quantitatively feeding into the specific gravity magnetic separation device, wherein the feed end of the screw quantitative feeder is connected with the pneumatic conveying device, the discharge end of the screw quantitative feeder is connected with the specific gravity magnetic separation device, and the pneumatic conveying device (1) is connected with the specific gravity magnetic separation device (2) through the screw quantitative feeder (23). The zinc-containing dust of the dry method is quantitatively conveyed into the specific gravity magnetic separation device through the spiral quantitative feeder, so that the amount of the zinc-containing dust of the dry method to be separated in the specific gravity magnetic separation device is conveniently controlled, and the phenomena of separation supplement and non-uniformity caused by excessive amount of the zinc-containing dust of the dry method added into the specific gravity magnetic separation device are avoided.
Preferably, the zinc-containing dust treatment system for steel smelting further comprises a dust collecting fan for collecting carbon-containing materials, and the dust collecting fan is connected with the cyclone recovery device. Lighter carbonaceous materials can be collected through the powder collecting fan, and the recovery of carbon elements is realized.
Preferably, the zinc-containing dust treatment system for steel smelting further comprises an air supplementing and pressurizing device, the air supplementing and pressurizing device is used for supplementing air to the specific gravity magnetic separation device, an air inlet of the air supplementing and pressurizing device is connected with the powder collecting fan and the waste heat power generation device respectively, and an air outlet of the air supplementing and pressurizing device is connected with the specific gravity magnetic separation device. Through mending wind supercharging device, introduce proportion magnetic separation device with waste heat power generation facility's waste heat and the wind that receives the air outlet of powder fan and draw forth, realized the dry process zinciferous dust in the contrast gravity magnetic separation device preheat with receive the circulation separation collection of the carbon element that carries in the powder fan induced-out wind, practiced thrift the energy, practiced thrift the carbon resource, also avoided directly discharging poisonous and harmful gas into the atmosphere, the polluted environment.
The invention also provides a method for treating dry-process zinc-containing dust by using the zinc-containing dust treatment system for steel smelting, which comprises the following steps:
s1, conveying dust: conveying the dry zinc-containing dust to a spiral constant feeder through a pneumatic conveying device; then quantitatively conveying the dry zinc-containing dust to a specific gravity magnetic separation device through a screw quantitative feeder;
s2, specific gravity magnetic separation: under the auxiliary action of a vibration device and a cyclone recovery device, a specific gravity magnetic separation device separates dry dedusting ash to obtain lighter carbon-containing materials, magnetic iron-containing materials and high-zinc mixed materials; collecting carbonaceous materials by a powder collecting fan, and collecting and separating the obtained magnetic iron-containing materials;
s3, microwave vacuum dezincification: quantitatively conveying the high-zinc mixed material to a microwave vacuum dezincification device through a pneumatic conveying device, heating and gasifying zinc elements in the high-zinc mixed material in the microwave vacuum dezincification, then feeding the high-zinc mixed material into a first waste heat recovery device through a vacuum channel, and cooling the high-zinc mixed material in the first waste heat recovery device to obtain zinc powder; forming an iron-containing material from the mixed material after dezincification; meanwhile, the waste heat of the waste heat recovery device I is transmitted to the waste heat power generation device, part of the redundant waste heat returns to the waste heat recovery device I, and the other part of the waste heat preheats the materials in the specific gravity magnetic separation device through the air supplementing and pressurizing device;
s4, briquetting and recycling the high-temperature iron-containing materials: the iron-containing material formed after the dezincification in the step S3 enters a hot-press forming device, is subjected to press forming in the hot-press forming device, and is cooled by a waste heat recovery device II to obtain an iron-containing material briquette; meanwhile, the waste heat in the waste heat recovery device II is transmitted to the waste heat power generation device, one part of the redundant waste heat returns to the waste heat recovery device II, and the other part of the waste heat preheats the materials in the specific gravity magnetic separation device through the air supplementing and pressurizing device.
The method realizes the comprehensive recycling of high-value zinc, carbon and iron-containing materials, and the whole dezincification process does not generate harmful gas and secondary pollution because of the adoption of the microwave vacuum dezincification method, and the method is simple, green and environment-friendly. In addition, the waste heat carried by the high-temperature iron-containing materials and the zinc steam after microwave vacuum dezincification is secondarily utilized, so that the energy waste is avoided, and the treatment cost of the dry-method dedusting ash is saved.
Drawings
FIG. 1 is a process flow diagram of a zinc-containing dust treatment system for iron and steel smelting in example 1 of the present invention;
FIG. 2 is a schematic view of a zinc-containing dust treatment system for iron and steel smelting in example 1 of the present invention;
FIG. 3 is a process flow diagram of the zinciferous dust processing system for iron and steel smelting in example 3 of the present invention; (ii) a
FIG. 4 is a schematic view of a zinc-containing dust treatment system for iron and steel smelting in example 3 of the present invention.
Description of reference numerals:
1-pneumatic conveying device, 2-specific gravity magnetic separation device, 3-vibration device, 4-cyclone recovery device, 5-microwave vacuum dezincification device, 6-first discharge end, 7-second discharge end, 8-third discharge end, 9-powder collection fan, 10-carbon-containing material bin, 11-magnetic iron-containing material recovery device, 12-magnetic iron-containing material bin, 13-zinc-containing gas collection device, 14-iron-containing material collection device, 15-hot press molding device, 16-waste heat recovery device I, 17-waste heat recovery device II, 18-zinc powder collection bag, 19-iron-containing material bin, 20-waste heat power generation device, 21-high-position bin, 22-air supplementing pressurizing device and 23-spiral quantitative feeding machine.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments of the present invention, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
Referring to fig. 1 and 2, the present embodiment discloses a zinc-containing dust treatment system for iron and steel smelting, comprising:
the pneumatic conveying device 1 is used for conveying dry-method dedusting ash;
the specific gravity magnetic separation device 2 is used for separating carbon-containing materials, iron-containing materials and high-zinc mixed materials;
the vibration device 3 is used for assisting the specific gravity magnetic separation device 2 in separating materials;
the cyclone recovery device 4 is used for assisting the specific gravity magnetic separation device 2 to recover the carbon-containing materials;
at least one microwave vacuum dezincification device 5 for separating zinc from the high-zinc mixture;
Compared with the technology of treating the dry dedusting ash by a physical method, a wet method and a fire method which are commonly adopted in the prior art, the zinc-containing dust treatment system for steel smelting provided by the embodiment has the following beneficial effects:
1. separating and recovering carbon-containing materials with lighter specific gravity and magnetic iron-containing materials with heavier specific gravity in the dry dedusting ash by a physical method (specific gravity magnetic separation device), and concentrating high-zinc materials; the high-zinc material is subjected to microwave vacuum dezincification and dezincification to obtain an iron-containing material and zinc powder, so that valuable resources of Fe, Zn and C in the blast furnace dry-method dust are reasonably separated, extracted and recovered;
2. the microwave vacuum dezincification method adopted by the invention has the characteristics of high efficiency, low cost and no secondary pollution, and thoroughly solves the problems of large recovery investment, high cost, serious pollution and the like of the 'fire dezincification' in the industry.
Example 2
This example discloses a method of using the zinc-containing dust treatment system for steel smelting of example 1, comprising the steps of:
s1, conveying dust: conveying the dry zinc-containing dust to a specific gravity magnetic separation device 2 through a pneumatic conveying device 1;
s2, specific gravity magnetic separation: under the auxiliary action of the vibration device 3 and the cyclone recovery device 4, the specific gravity magnetic separation device 2 separates the dry dedusting ash to obtain lighter carbon-containing materials, magnetic iron-containing materials and high-zinc mixed materials;
s3, microwave vacuum dezincification: the high-zinc mixed material is quantitatively conveyed to a microwave vacuum dezincification device 5 through a pneumatic conveying device 1, and zinc elements in the high-zinc mixed material are heated to be gasified in the microwave vacuum dezincification device 5 and then cooled and collected to obtain zinc powder.
Example 3
With reference to fig. 3 and 4, the embodiment discloses another zinc-containing dust treatment system for steel smelting, which further includes an elevated bunker 21 and a screw quantitative feeder 23 on the basis of embodiment 1, wherein a feed end of the elevated bunker 21 is connected to the pneumatic conveying device 1, a discharge end of the elevated bunker 21 is connected to a feed end of the screw quantitative feeder 23, a discharge end of the screw quantitative feeder 23 is connected to the specific gravity magnetic separation device 2, and the elevated bunker 21 is used for temporarily storing dry dedusting ash; the screw constant feeder 23 is used for quantitatively feeding into the specific gravity magnetic separation device 2, the feeding end of the screw constant feeder 23 is connected with the pneumatic conveying device 1, the discharging end of the screw constant feeder 23 is connected with the specific gravity magnetic separation device 2, and the pneumatic conveying device 1 is connected with the specific gravity magnetic separation device 2 through the high-position stock bin 21 and the screw constant feeder 23. The zinc-containing dust is quantitatively conveyed into the specific gravity magnetic separation device 2 through the spiral quantitative feeder 23, so that the dry zinc-containing dust to be separated in the specific gravity magnetic separation device 2 can be conveniently controlled, and the phenomena of supplementary and uneven separation caused by excessive amount of the dry zinc-containing dust added into the specific gravity magnetic separation device 2 in the blast furnace are avoided.
With reference to fig. 3 and 4, another zinc-containing dust processing system for steel smelting disclosed in this embodiment further includes a dust collecting blower 9, a carbonaceous material bin 10, and an air supplementing and pressurizing device 22, where the dust collecting blower 9 is used to recover carbonaceous materials, the carbonaceous material bin 10 is used to store and collect carbonaceous materials, and the air supplementing and pressurizing device 22 is used to supplement air to the specific gravity magnetic separation device 2; receive powder fan 9 and be equipped with feed end, discharge end and air outlet, the feed end of receiving powder fan 9 links to each other with whirlwind recovery unit 4, and the discharge end of receiving powder fan 9 links to each other with carbonaceous material feed bin 10, and the air outlet of receiving powder fan 9 links to each other with tonifying wind supercharging device 22, and tonifying wind supercharging device 22's air outlet links to each other with proportion magnetic separation separator 2. Lighter carbonaceous materials can be collected through the powder collecting fan 9, and the recovery of carbon elements is realized. Meanwhile, air led out by the powder collecting fan 9 is led into the specific gravity magnetic separation device 2 through the air supplementing and pressurizing device 22 for secondary separation, harmful gas is prevented from being discharged into the atmosphere, the environment is protected, and waste of carbon resources is avoided.
With reference to fig. 3 and 4, another zn-containing dust processing system for iron and steel smelting disclosed in this embodiment further includes a magnetic fe-containing material recycling device 11 and a magnetic fe-containing material bin 12, the magnetic fe-containing material recycling device 11 is used for recycling magnetic fe-containing materials, the magnetic fe-containing material bin 12 is used for collecting magnetic fe-containing materials, a feed end of the magnetic fe-containing material recycling device 11 is connected with the first discharge end 6 of the specific gravity magnetic separation device 2, and a discharge end of the magnetic fe-containing materials is connected with the magnetic fe-containing material bin 12.
Referring to fig. 3 and 4, another zinc-containing dust treatment system for iron and steel smelting disclosed in the embodiment further includes a zinc-containing gas collection device 13, a first waste heat recovery device 16, a zinc powder collection bag 18, and a waste heat power generation device 20. The zinc-containing gas collection device 13 is used for temporarily collecting zinc-containing gas, the first waste heat recovery device 16 is used for cooling the zinc-containing gas and recycling waste heat, the zinc powder collection bag 18 is used for collecting zinc powder, and the waste heat power generation device 20 is used for generating power by using waste heat; the feed inlet of the zinc-containing gas collecting device 13 is connected with the microwave vacuum dezincification device 5, the number of the microwave vacuum dezincification devices 5 is three in the embodiment, and in other embodiments, the number of the microwave vacuum dezincification devices 5 can be set according to the actual capacity requirement. A discharge port of the zinc-containing gas collecting device 13 is connected with a feed end of a waste heat recovery device I16, and a discharge end of the waste heat recovery device is connected with a zinc powder collecting bag 18; meanwhile, a part of the waste heat recovery device I16 is transmitted to the waste heat power generation device 20, a part of the redundant waste heat returns to the waste heat recovery device I16, and the other part of the waste heat preheats the materials in the gravity magnetic separation device 2 through the air supplementing and pressurizing device 22.
With reference to fig. 3 and 4, another zinc-containing dust treatment system for iron and steel smelting disclosed in the embodiment further includes an iron-containing material collection device 14, a hot press molding device 15, a waste heat recovery device ii 17 and an iron-containing material bin 19, wherein the iron-containing material collection device 14 is used for collecting high-temperature iron-containing materials after dezincification, the hot press molding device 15 is used for pressing iron-containing material briquettes of different shapes, and the waste heat recovery device is used for cooling the press-molded high-temperature iron-containing materials and performing waste heat circulation; the feeding end of the hot-press forming device 15 is connected with the microwave vacuum dezincification device 5, and the discharging end of the hot-press forming device 15 is connected with the second waste heat recovery device 17. The iron-containing material can be directly processed into a required shape according to actual requirements through the hot-press forming device 15, so that the process of secondary heating of the iron-containing material is avoided, and energy is saved; the iron-containing material bin 19 is connected with the second waste heat recovery device 17; meanwhile, a part of the waste heat in the waste heat recovery device II 17 is transmitted to the waste heat power generation device 20, a part of the redundant waste heat returns to the waste heat recovery device II 17, and a part of the waste heat preheats the materials in the gravity magnetic separation device 2 through the air supplementing and pressurizing device 22.
Example 4
This example discloses a method of using the zinc-containing dust treatment system for steel smelting of example 3, comprising the steps of:
s1, conveying dust: conveying the dry-method zinc-containing dust to a high-level bin 21 through a pneumatic conveying device 1, and then conveying the dry-method zinc-containing dust to a spiral quantitative feeder 23 through the high-level bin 21; then quantitatively delivering the dry zinc-containing dust to a specific gravity magnetic separation device 2 through a screw quantitative feeder 23;
s2, specific gravity magnetic separation: under the auxiliary action of the vibration device 3 and the cyclone recovery device 4, the specific gravity magnetic separation device 2 separates the dry dedusting ash to obtain lighter carbon-containing materials, magnetic iron-containing materials and high-zinc mixed materials; lighter carbonaceous materials are collected in the carbonaceous material bin 10 under the action of the powder collecting fan 9, and heavier magnetic iron-containing materials are collected in the magnetic iron-containing material bin 12 through the magnetic iron-containing material recovery device. Meanwhile, the lead-out air of the powder collecting fan 9 is led into the specific gravity magnetic separation device 2 through the air supplementing and pressurizing device 22, and secondary separation is carried out on carbon resources carried in the lead-out air.
S3, microwave vacuum dezincification: quantitatively feeding the high-zinc mixed material to a microwave vacuum dezincification device 5 through a pneumatic conveying device 1, heating zinc elements in the high-zinc mixed material to be gasified in microwave vacuum dezincification, feeding the gasified zinc elements into a zinc-containing gas collecting device 13 through a vacuum channel, feeding collected zinc steam into a waste heat recovery device I16 through the zinc-containing gas collecting device 13, cooling the zinc steam in the waste heat recovery device I16, and collecting the obtained zinc powder in a zinc powder collecting bag 18; forming a high-temperature iron-containing material from the mixed material after dezincification; meanwhile, a part of the waste heat recovery device I16 is transmitted to the waste heat power generation device 20, a part of the redundant waste heat returns to the waste heat recovery device I16, and a part of the waste heat preheats the materials in the gravity magnetic separation device 2 through the air supplementing and pressurizing device 22;
s4, briquetting and recycling the high-temperature iron-containing materials: the high-temperature iron-containing material formed after dezincification in the step S3 is collected, enters the high-temperature iron-containing material collection device 14, is sent to the hot-press forming device 15, is subjected to press forming in the hot-press forming device 15, and is cooled by the waste heat recovery device II 17, so that iron-containing material briquettes are obtained; meanwhile, a part of the waste heat in the waste heat recovery device II 17 is transmitted to the waste heat power generation device 20, a part of the redundant waste heat returns to the waste heat recovery device II 17, and a part of the waste heat preheats the materials in the gravity magnetic separation device 2 through the air supplementing and pressurizing device 22.
Although the present disclosure has been described above, the scope of the present disclosure is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present disclosure, and such changes and modifications will fall within the scope of the present invention.
Claims (8)
1. A zinciferous dust processing system for steel smelting is characterized by comprising:
the pneumatic conveying device (1) is used for conveying the blast furnace dry dedusting ash;
the specific gravity magnetic separation device (2) is used for separating carbon-containing materials, iron-containing materials and high-zinc mixed materials;
the vibration device (3) is used for assisting the specific gravity magnetic separation device (2) to separate materials;
the cyclone recovery device (4) is used for assisting the specific gravity magnetic separation device (2) to recover the carbon-containing materials;
at least one microwave vacuum dezincification device (5) for separating zinc from the high-zinc mixture material;
pneumatic conveyor (1) with the feed end of proportion magnetic separation device (2) links to each other, vibrating device (3) with proportion magnetic separation device (2) link to each other, proportion magnetic separation device (2) contain three discharge end: the device comprises a first discharge end (6), a second discharge end (7) and a third discharge end (8), wherein the first discharge end (6) is used for outputting iron-containing materials; the second discharge end (7) is connected with the feed end of the cyclone recovery device (4) and is used for outputting carbon-containing materials; and the third discharge end (8) is connected with the feed end of the microwave vacuum dezincification device (5) and is used for outputting high-zinc materials.
2. The zinc-containing dust treatment system for steel smelting according to claim 1, further comprising a first waste heat recovery device (16) and a second waste heat recovery device (17), wherein the first waste heat recovery device (16) and the second waste heat recovery device (17) are respectively connected with the microwave vacuum dezincification device (5), and the first waste heat recovery device (16) is used for cooling and recovering zinc-containing gas and recovering and recycling waste heat; and the second waste heat recovery device (17) is used for cooling and recovering high-temperature iron-containing materials and recycling waste heat.
3. The zinc-containing dust treatment system for steel smelting according to claim 2, further comprising a waste heat power generation device (20), wherein the waste heat power generation device (20) is respectively connected with the first waste heat recovery device (16) and the second waste heat recovery device (17) and is used for generating power by utilizing waste heat of materials in the first waste heat recovery device (16) and the second waste heat recovery device (17).
4. The zinc-containing dust treatment system for steel smelting according to claim 3, further comprising a hot press forming device (15) for making iron-containing material briquettes of different shapes, wherein the feeding end of the hot press forming device (15) is connected with the microwave vacuum dezincification device (5), and the discharging end of the hot press forming device (15) is connected with the second waste heat recovery device (17).
5. The zinc-containing dust treatment system for steel smelting according to claim 4, further comprising a screw quantitative feeder (23) for quantitatively feeding into the specific gravity magnetic separation device (2), wherein a feeding end of the screw quantitative feeder (23) is connected with the pneumatic conveying device (1), a discharging end of the screw quantitative feeder (23) is connected with the specific gravity magnetic separation device (2), and the pneumatic conveying device (1) and the specific gravity magnetic separation device (2) are connected through the screw quantitative feeder (23).
6. The zinc-containing dust treatment system for steel smelting according to claim 5, further comprising a dust collecting fan (9) for collecting carbonaceous material, wherein the dust collecting fan (9) is connected with the cyclone recovery device (4).
7. The zinc-containing dust treatment system for steel smelting according to claim 6, further comprising an air supplementing and pressurizing device (22) for supplementing air to the specific gravity magnetic separation device (2), wherein an air inlet of the air supplementing and pressurizing device (22) is connected with the powder collecting fan (9) and the waste heat power generation device (20) respectively, and an air outlet of the air supplementing and pressurizing device (22) is connected with the specific gravity magnetic separation device (2).
8. A method of using the zinc-containing dust processing system for steel smelting of claim 7, comprising the steps of:
s1, conveying dust: conveying the zinc-containing dust to a screw constant feeder (23) through a pneumatic conveying device (1); then the zinc-containing dust is sent to a specific gravity magnetic separation device (2) through a screw constant feeder (23);
s2, specific gravity magnetic separation: under the auxiliary action of the vibration device (3) and the cyclone recovery device (4), the specific gravity magnetic separation device (2) separates zinc-containing dust to obtain lighter carbon-containing materials, magnetic iron-containing materials and high-zinc mixed materials; then, the carbon-containing materials are collected through a powder collecting fan (9), and the magnetic iron-containing materials are obtained through separation and collection;
s3, microwave vacuum dezincification: quantitatively conveying the high-zinc mixed material to a microwave vacuum dezincification device (5) through a pneumatic conveying device (1), heating zinc elements in the high-zinc mixed material to be gasified in the microwave vacuum dezincification device (5), then conveying the zinc elements into a first waste heat recovery device (16) through a vacuum channel, and cooling in the first waste heat recovery device (16) to obtain zinc powder; forming a high-temperature iron-containing material from the mixed material after the dezincification; meanwhile, the waste heat of the waste heat recovery device I (16) is transmitted to the waste heat power generation device (20), one part of the redundant waste heat returns to the waste heat recovery device I (16), and the other part of the waste heat preheats the materials in the gravity magnetic separation device (2) through the air supplementing and pressurizing device (22);
s4, briquetting and recycling the high-temperature iron-containing materials: the iron-containing material formed after the dezincification in the step S3 enters a hot-press forming device (15), the iron-containing material is pressed and formed in the hot-press forming device (15), and then is cooled by a second waste heat recovery device (17), so that iron-containing material briquettes are obtained; meanwhile, one part of the waste heat in the waste heat recovery device II (17) is transmitted to the waste heat power generation device (20), one part of the redundant waste heat returns to the waste heat recovery device II (17), and the other part of the waste heat preheats the materials in the gravity magnetic separation device (2) through the air supplementing and pressurizing device (22).
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