CN113926587A - Process and device for separating iron from blast furnace ash - Google Patents

Process and device for separating iron from blast furnace ash Download PDF

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Publication number
CN113926587A
CN113926587A CN202111049448.9A CN202111049448A CN113926587A CN 113926587 A CN113926587 A CN 113926587A CN 202111049448 A CN202111049448 A CN 202111049448A CN 113926587 A CN113926587 A CN 113926587A
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CN
China
Prior art keywords
iron
blast furnace
dust
flue gas
magnet
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Pending
Application number
CN202111049448.9A
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Chinese (zh)
Inventor
张英辰
汤添翼
韩和惠
郝晋荣
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Shanxi Hangjin Environmental Protection Technology Co ltd
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Shanxi Hangjin Environmental Protection Technology Co ltd
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Priority to CN202111049448.9A priority Critical patent/CN113926587A/en
Publication of CN113926587A publication Critical patent/CN113926587A/en
Pending legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C1/00—Magnetic separation
    • B03C1/02—Magnetic separation acting directly on the substance being separated
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C1/00—Magnetic separation
    • B03C1/02—Magnetic separation acting directly on the substance being separated
    • B03C1/30—Combinations with other devices, not otherwise provided for
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B1/00—Cleaning by methods involving the use of tools
    • B08B1/10—Cleaning by methods involving the use of tools characterised by the type of cleaning tool
    • B08B1/16—Rigid blades, e.g. scrapers; Flexible blades, e.g. wipers
    • B08B1/165—Scrapers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B1/00—Cleaning by methods involving the use of tools
    • B08B1/20—Cleaning of moving articles, e.g. of moving webs or of objects on a conveyor
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B7/00—Blast furnaces
    • C21B7/002—Evacuating and treating of exhaust gases
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B7/00—Blast furnaces
    • C21B7/22—Dust arresters
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B2100/00—Handling of exhaust gases produced during the manufacture of iron or steel
    • C21B2100/40—Gas purification of exhaust gases to be recirculated or used in other metallurgical processes
    • C21B2100/44—Removing particles, e.g. by scrubbing, dedusting
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacture And Refinement Of Metals (AREA)

Abstract

The invention relates to the technical field of blast furnace flue gas iron and zinc separation, in particular to a process and a device for separating iron from blast furnace ash. Solves the technical problem of complex process of separating iron from blast furnace ash. The utility model provides a process of iron separation in blast furnace ash, in blast furnace smelting, draw forth the flue gas of zinciferous iron content dust from the dust removal petticoat pipe, leading-in iron separation entrapment device sets up the magnet that removes in iron separation entrapment device, sets up on the magnet and scrapes the iron ware, the flue gas is at the in-process through iron separator, the iron content dust granule in the flue gas that flows is attracted by the magnet that removes and catches to scrape iron content dust granule through scraping the iron ware, the flue gas after the deironing gets into next dust removal link. The iron-containing component in the blast furnace dust is directly adsorbed before the blast furnace dust is collected to carry out dynamic adsorption in the flowing flue gas, the magnetic material area of absorption usefulness is big, therefore iron-containing dust particle adsorption rate is high, adsorbs the back with most iron-containing dust particles, and the iron powder that obtains is purer, directly goes into the blast furnace and smelts again.

Description

Process and device for separating iron from blast furnace ash
Technical Field
The invention relates to the technical field of blast furnace flue gas iron and zinc separation, in particular to a process and a device for separating iron from blast furnace ash.
Background
In the iron-making production, iron ore, coke and flux are charged into a blast furnace. Iron ore, mainly iron and oxygen compounds, is charged into the blast furnace. At high temperature, the carbon in the coke and the injected material and carbon monoxide generated by the combustion of the carbon deprive oxygen in the iron ore to obtain iron. The iron ore is reduced to produce pig iron, and molten iron is discharged from a tap hole. Gangue, coke and ash content in the injected material in the iron ore are combined with fluxes such as limestone added into the furnace to generate slag, and the slag is discharged from a tap hole and a slag hole respectively. The gas produced during the smelting is conducted from the top of the furnace, and the hot gas stream rising in the furnace is mixed with the descending furnace stream (iron ore, coke, flux, etc.). The gas discharged from the blast furnace contains a large amount of ash, generally 100-120 kg of furnace dust is generated in each ton of pig iron, the mass fraction of iron in the furnace dust is 30-45%, and the furnace dust contains 5-20% of zinc oxide, minerals and other impurities. After dust removal, the coal gas is used as industrial coal gas.
In order to avoid wasting iron resources, it is necessary to recycle the iron element in the blast furnace dust. If directly collect the back with blast furnace ash directly, drop into the blast furnace and smelt again, zinc oxide after the enrichment can produce the destruction effect to the blast furnace, if directly return the blast furnace system of smelting under the condition of not handling, will cause the blast furnace to nodulate, influence the normal work of blast furnace, influence the blast furnace life-span even. So that the blast furnace dust cannot be directly utilized. In order to separate iron from blast furnace ash, the conventional method is to collect the blast furnace ash by a dust removing device and then separate the blast furnace ash by a magnetic separation device. For example, CN101654717B discloses a comprehensive treatment method for blast furnace fly ash, belonging to the technical field of waste treatment. Adding water into blast furnace dust removal ash, mixing the blast furnace dust removal ash with the water, performing secondary magnetic separation, performing flotation, separating iron fine powder and carbon fine powder in a spiral chute in tailing treatment, further screening and recovering the carbon fine powder in wastewater subjected to iron removal in the spiral chute, and performing pressure filtration on the generated wastewater for recycling. The method can greatly improve the selection yield of the iron refined powder and the carbon refined powder, improve the grade of the obtained iron refined powder and the carbon refined powder, simultaneously can avoid generating new pollution, protect the environment and change waste into valuable. The similar technology is that floating carbon collecting agent and foaming agent are added into CN110586318A blast furnace ash slurry for size mixing treatment, then carbon concentrate and flotation tailings are obtained through flotation, cyclone classification is carried out on the flotation tailings to obtain fine mud material and settled sand, the settled sand is subjected to weak magnetic separation to obtain iron concentrate A and weak magnetic separation tailings, the weak magnetic separation tailings are subjected to strong magnetic separation to obtain iron concentrate B and strong magnetic separation tailings, and the fine mud material and the strong magnetic separation tailings are mixed and then concentrated and filtered to obtain high zinc tailings. CN111229453A A blast furnace ash recovery iron and carbon system, the device includes solution preparation device, blast furnace ash recovery iron device, blast furnace ash recovery carbon device and solution recovery device, wherein, the solution preparation device, the blast furnace ash recovery iron device, the blast furnace ash recovery carbon device and the solution recovery device are communicated in turn, the blast furnace ash passes through the solution preparation device, the blast furnace ash recovery iron device, the blast furnace ash recovery carbon device and the solution recovery device in turn; the blast furnace ash iron recovery device is provided with a magnetic part, and the magnetic part can absorb iron in the blast furnace ash solution in the process that the blast furnace ash solution prepared by the solution preparation device passes through the blast furnace ash iron recovery device; when the flotation reagent is added into the blast furnace ash carbon recovery device, the carbon in the blast furnace ash solution can float on the flotation reagent.
Further, a scheme of removing iron in a flow by using an electromagnet is proposed, for example, CN112708770A discloses a method for enriching iron, zinc and carbon by using gas ash, which screens the collected gas ash to remove impurities, and then performs baking and grinding treatment; conveying the gas ash into a wind power classification-wind magnetic separation device by air force; and (3) separating the gas ash by using a wind power classification-wind magnetic separation device to obtain an iron-rich material, a zinc-rich material and a carbon-rich material. The wind power classification-wind magnetic separation device utilizes the magnetic equipment to separate iron-rich materials. The magnetic equipment comprises a plurality of strip-shaped electromagnets which are distributed at intervals, and the strip-shaped electromagnets are arranged in an induced air channel of the wind power classification-wind power magnetic separation device. The iron-rich material can be enriched according to the magnetic strength of the strip-shaped electromagnet.
The technical scheme has the obvious characteristics that the blast furnace ash is collected firstly and then is subjected to magnetic iron removal treatment in various forms, so that the process is complex and the cost is increased. Even if the wind classification and wind magnetic separation device is used, the electromagnet is in a fixed state, and only iron particles with a short distance can be adsorbed, so that the iron particles in the wind flow are difficult to be effectively adsorbed.
Disclosure of Invention
The invention provides a process and a device for separating iron from blast furnace ash, aiming at solving the technical problem of complex process of separating iron from blast furnace ash.
The utility model provides a process of iron separation in blast furnace ash, in blast furnace smelting, draw forth the flue gas of zinciferous iron content dust from the dust removal petticoat pipe, leading-in iron separation entrapment device sets up the magnet that removes in iron separation entrapment device, sets up on the magnet and scrapes the iron ware, the flue gas is at the in-process through iron separator, the iron content dust granule in the flue gas that flows is attracted by the magnet that removes and catches to scrape iron content dust granule through scraping the iron ware, the flue gas after the deironing gets into next dust removal link.
The utility model provides a blast furnace ash mesoiron separation entrapment device, includes the casing, is equipped with mobilizable magnet in the casing, and the magnet surface is equipped with scrapes the iron ware, is equipped with air inlet and gas outlet on the casing, is equipped with iron-containing dust collection mouth in the casing lower part.
The magnet is a permanent magnet or an electromagnet. The magnet is a magnetic blade. The magnetic blades are opposite to the air inlet. The magnetic blades may also be on the sides within the housing.
The casing be the cylindrical casing that one end set up for transversely, the other end is vertebra form casing, establishes the air inlet at vertebra form casing tip, establishes the gas outlet above cylindrical casing, is equipped with iron content dust below cylindrical casing and collects the mouth.
The magnetic impeller is characterized in that a rotating shaft is arranged in the shell, a plurality of magnetic blades are arranged on the rotating shaft to form a magnetic impeller, the rotating shaft is driven by a motor and is opposite to the air inlet, an iron scraping device is arranged in the shell, a scraping plate made of a non-metal material is arranged on the iron scraping device, and the scraping plate is in surface contact with the magnetic blades.
The effect is as follows: directly adsorb the iron content in the blast furnace dust before the blast furnace dust is collected to carry out dynamic adsorption in the flue gas that flows, the magnetic material area of adsorbing usefulness is big, consequently iron content dust particle adsorption rate is high, adsorbs the back with most iron content dust particle, and the iron powder that obtains is purer, directly goes into the blast furnace and smelts again. The remaining dust mainly contains zinc element and is used for refining the zinc element. The process is simple, and the cost of recovering iron and separating zinc from the blast furnace dust is greatly reduced.
The process and the device can improve the iron removal rate by increasing the number of stages of the magnetic impellers, can realize 100 percent removal of iron element in blast furnace dust, and realize the dezincification of the blast furnace gas dust in a steel mill by phase change. Compared with the prior rotary kiln dezincification commonly used in steel mills, the process equipment reduces the iron obtaining cost by more than 30 percent.
Drawings
FIG. 1 is a schematic view of the apparatus of the present invention;
FIG. 2 is a schematic view of the internal structure;
FIG. 3 is a second internal view;
FIG. 4 is a schematic view of a magnetic blade and a scraper;
in the figure: 1-air outlet, 2-shell, 3-air inlet, 4-bracket I, 5-conical shell, 6-rotating shaft, 7-magnetic blade, 8-cylindrical shell, 9-driving wheel, 10-bracket II, 11-lower valve, 12-collection bin, 13-upper valve, 14-iron-containing dust collection port, 15-iron scraper and 16-motor.
Detailed Description
The utility model provides a process of iron separation in blast furnace ash, in blast furnace smelting, draw forth the flue gas of zinciferous iron content dust from the dust removal petticoat pipe, leading-in iron separation trapping apparatus sets up the magnet that removes in iron separation trapping apparatus, sets up on the magnet and scrapes the iron ware, and the flue gas is at the in-process that passes through iron separation apparatus, and the iron content dust granule in the flue gas that flows is attracted by the magnet that removes and is caught to scrape iron content dust granule through scraping the iron ware, the flue gas after the deironing gets into next dust removal link.
As shown in fig. 1, 2, 3 and 4, the blast furnace ash-iron separating and capturing device comprises a shell 2, wherein a movable magnet is arranged in the shell 2, an iron scraper 15 is arranged on the surface of the magnet, an air inlet 3 and an air outlet 1 are arranged on the shell 2, and an iron-containing dust collecting port is arranged at the lower part of the shell 2.
The magnet is a permanent magnet or an electromagnet.
The magnet is a magnetic blade 7. The middle part of the magnetic blade 7 is a magnetic area, and the outer edge of the magnetic blade is provided with a non-magnetic area. When the iron scraper works, iron particles are scraped to the nonmagnetic sheet area through relative motion, and then the iron particles can fall off.
The magnetic blades 7 are opposite to the air inlet 3. The magnetic blades 7 can be arranged on the side surface in the shell 2, and the effect is best.
Casing 2 one end for the cylindrical casing 8 of horizontal setting, the other end is vertebra form casing 5, establishes air inlet 3 at the 5 tip of vertebra form casing, establishes gas outlet 1 above cylindrical casing 8, is equipped with iron-containing dust collection mouth 14 below cylindrical casing 8. The gas enters from the gas inlet 3, the cross section is enlarged after passing through the conical shell, the flow velocity is reduced, and the adsorption of iron particles is facilitated.
Be equipped with pivot 6 in casing 2, be equipped with magnet on pivot 6, pivot 6 passes through the drive of motor 16, and pivot 6 is just to 3 positions of air inlet, is equipped with in casing 2 and scrapes iron ware 15, scrapes the scraper blade that has non-metallic material to make on iron ware 15, scraper blade and magnet surface contact. The motor drives the rotating shaft to rotate, so that the magnet rotates, iron particles in the smoke are adsorbed in the rotation, and the iron particles are scraped off by the iron scraper.
The rotating shaft 6 penetrates through the shell 2, a driving wheel 9 is arranged at the outer end of the rotating shaft 6, and the driving wheel 9 is connected with a motor 16 through a belt, a chain or a gear.
The length of the magnetic vanes 7 is the inner radius of the housing 2. The rotating cross section of the magnetic blade is consistent with the cross section of the shell, and the smoke is prevented from leaking from a side gap.
The magnetic vanes 7 form a magnetic impeller, more than one group of magnetic impellers are arranged on the rotating shaft 6 in parallel. The magnetic blades of multiple groups can ensure the highest trapping efficiency of the iron-containing dust particles.
The iron scraper 15 is positioned below the rotating shaft 6, and the scraped iron particles directly fall to the collecting port at the lower part and cannot be attracted again.
A collecting bin 12 is arranged below the iron-containing dust collecting port 14, an upper valve 13 is arranged above the collecting bin 12, and a lower valve 11 is arranged below the collecting bin 12. In order to guarantee the inside normal pressure of casing at ordinary times, go up valve 13 closed condition, when accumulating certain volume and need go out the storehouse, close lower valve 11, open valve 13 again, during the iron-containing granule got into collecting bin 12 promptly, the pressure in this in-process assurance casing was unchangeable, and inside operation normally goes on.

Claims (10)

1. A process for separating iron from blast furnace dust is characterized in that in blast furnace smelting, flue gas containing zinc and iron-containing dust is led out from a dust removal smoke hood, the flue gas is led into an iron separation and capture device, a movable magnet is arranged in the iron separation and capture device, an iron scraper is arranged on the magnet, iron-containing dust particles in flowing flue gas are attracted and captured by the movable magnet in the process that the flue gas passes through the iron separation device, the iron-containing dust particles are scraped by the iron scraper, and the flue gas after iron removal enters the next dust removal link.
2. The utility model provides a blast furnace ash middlings iron separation entrapment device which characterized in that: the iron dust collector comprises a shell (2), a movable magnet is arranged in the shell (2), an iron scraper (15) is arranged on the surface of the magnet, an air inlet (3) and an air outlet (1) are arranged on the shell (2), and an iron-containing dust collecting port (14) is arranged on the lower portion of the shell (2).
3. The blast furnace dust and iron separating and trapping device according to claim 1, wherein: the magnet is a magnetic blade (7), the middle part of the magnetic blade (7) is a magnetic area, and the outer edge of the magnetic blade (7) is provided with a non-magnetic area.
4. The blast furnace dust and iron separating and trapping device according to claim 1, wherein: casing (2) one end for cylindrical casing (8) that transversely set up, the other end is vertebra form casing (5), establishes air inlet (3) at vertebra form casing (5) tip, establishes gas outlet (1) above cylindrical casing (8), is equipped with iron content dust collection mouth (14) below cylindrical casing (8).
5. The blast furnace dust and iron separating and trapping device according to claim 1, wherein: the magnetic blades (7) are opposite to the air inlet (3).
6. The blast furnace dust and iron separating and trapping device according to claim 1, wherein: the magnetic blades (7) are in a lateral position within the housing (2).
7. The blast furnace dust and iron separating and trapping device according to claim 1, wherein: be equipped with pivot (6) in casing (2), be equipped with magnet on pivot (6), pivot (6) are passed through motor (16) drive, and pivot (6) just are equipped with in casing (2) and scrape ironware (15) to air inlet (3) position, scrape the scraper blade that has non-metallic material to make on ironware (15), scraper blade and magnet surface contact.
8. The blast furnace dust and iron separating and trapping device according to claim 7, wherein: the rotating shaft (6) penetrates through the shell (2), a driving wheel (9) is arranged at the outer end of the rotating shaft (6), and the driving wheel (9) is connected with a motor (16) through a belt, a chain or a gear.
9. The blast furnace dust and iron separating and trapping device according to claim 3, wherein: the length of the magnetic blade (7) is the inner radius of the shell (2).
10. The blast furnace dust and iron separating and trapping device according to claim 2, wherein: a collecting bin (12) is arranged below the iron-containing dust collecting port (14), an upper valve (13) is arranged above the collecting bin (12), and a lower valve (11) is arranged below the collecting bin (12).
CN202111049448.9A 2021-09-08 2021-09-08 Process and device for separating iron from blast furnace ash Pending CN113926587A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202111049448.9A CN113926587A (en) 2021-09-08 2021-09-08 Process and device for separating iron from blast furnace ash

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202111049448.9A CN113926587A (en) 2021-09-08 2021-09-08 Process and device for separating iron from blast furnace ash

Publications (1)

Publication Number Publication Date
CN113926587A true CN113926587A (en) 2022-01-14

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Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101703963A (en) * 2009-10-12 2010-05-12 山东华特磁电科技股份有限公司 High-intensity magnetic field impulse dumping reclaimer
CN202983875U (en) * 2012-12-18 2013-06-12 连云港东海硅微粉有限责任公司 Dry type ultrathin powder de-ironing device
CN103785536A (en) * 2012-11-05 2014-05-14 盛秋生 Separating and recycling equipment and method for magnetic mud in cutting waste liquid
CN204841921U (en) * 2015-06-05 2015-12-09 乌海黑猫炭黑有限责任公司 Device that powder attitude carbon black magnetic impurities clear away
CN108706598A (en) * 2018-07-16 2018-10-26 新疆泰宇达环保科技有限公司 Improve the implementation method of silicon materials purity
CN208197298U (en) * 2018-03-15 2018-12-07 福建中宏新材料科技有限公司 A kind of magnetic separator
CN209646728U (en) * 2019-01-23 2019-11-19 江西省宜丰万国矿业有限公司 A kind of concentrate separating-purifying device
CN110499423A (en) * 2019-08-26 2019-11-26 湖南建鑫冶金科技有限公司 A kind of method of blast furnace main channel processing Zinc-Bearing Wastes agglomerate flue dust separation and recovery iron powder zinc powder
CN210000917U (en) * 2019-04-18 2020-01-31 郑州臻美资源农牧科技有限公司 kinds of fodder storage bins

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101703963A (en) * 2009-10-12 2010-05-12 山东华特磁电科技股份有限公司 High-intensity magnetic field impulse dumping reclaimer
CN103785536A (en) * 2012-11-05 2014-05-14 盛秋生 Separating and recycling equipment and method for magnetic mud in cutting waste liquid
CN202983875U (en) * 2012-12-18 2013-06-12 连云港东海硅微粉有限责任公司 Dry type ultrathin powder de-ironing device
CN204841921U (en) * 2015-06-05 2015-12-09 乌海黑猫炭黑有限责任公司 Device that powder attitude carbon black magnetic impurities clear away
CN208197298U (en) * 2018-03-15 2018-12-07 福建中宏新材料科技有限公司 A kind of magnetic separator
CN108706598A (en) * 2018-07-16 2018-10-26 新疆泰宇达环保科技有限公司 Improve the implementation method of silicon materials purity
CN209646728U (en) * 2019-01-23 2019-11-19 江西省宜丰万国矿业有限公司 A kind of concentrate separating-purifying device
CN210000917U (en) * 2019-04-18 2020-01-31 郑州臻美资源农牧科技有限公司 kinds of fodder storage bins
CN110499423A (en) * 2019-08-26 2019-11-26 湖南建鑫冶金科技有限公司 A kind of method of blast furnace main channel processing Zinc-Bearing Wastes agglomerate flue dust separation and recovery iron powder zinc powder

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