CN108559852A - A kind of blast furnace dust comprehensive utilization process - Google Patents

A kind of blast furnace dust comprehensive utilization process Download PDF

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Publication number
CN108559852A
CN108559852A CN201810428356.3A CN201810428356A CN108559852A CN 108559852 A CN108559852 A CN 108559852A CN 201810428356 A CN201810428356 A CN 201810428356A CN 108559852 A CN108559852 A CN 108559852A
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CN
China
Prior art keywords
iron
blast furnace
ash
magnetic
flyash
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201810428356.3A
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Chinese (zh)
Inventor
展仁礼
王欣
郭忆
边立国
韩立芳
任雪鹏
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Gansu Jiu Steel Group Hongxing Iron and Steel Co Ltd
Original Assignee
Gansu Jiu Steel Group Hongxing Iron and Steel Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Gansu Jiu Steel Group Hongxing Iron and Steel Co Ltd filed Critical Gansu Jiu Steel Group Hongxing Iron and Steel Co Ltd
Priority to CN201810428356.3A priority Critical patent/CN108559852A/en
Publication of CN108559852A publication Critical patent/CN108559852A/en
Pending legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • 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
    • C22B7/02—Working-up flue dust
    • 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
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B1/00—Preliminary treatment of ores or scrap
    • C22B1/005—Preliminary treatment of scrap
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B1/00—Preliminary treatment of ores or scrap
    • C22B1/14—Agglomerating; Briquetting; Binding; Granulating
    • C22B1/16—Sintering; Agglomerating
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • 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
    • C22B7/001—Dry processes
    • 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

Abstract

The problems such as the invention discloses a kind of blast furnace dust comprehensive utilization process, belong to technical field of mineral processing, higher to solve the alkali metal contents such as blast furnace dust zinc oxide, and sintering is directly returned with causing zinc enrichment to influence blast furnace normal operation.The present invention includes that weak magnetic, strong magnetic carry iron, zinc, coal ash lifting iron are received in electricity generation boiler burning reduction, bag filter cooling, make the elements effective recycling such as Fe, Zn, C in gas ash, surplus material supplying coal dust enters flyash and is all used for cement ingredient, realizes whole comprehensive utilizations of blast furnace dust.

Description

A kind of blast furnace dust comprehensive utilization process
Technical field
The invention belongs to technical field of mineral processing, and in particular to a kind of blast furnace dust comprehensive utilization process.
Background technology
In blast furnace ironmaking process, stove dirt is drawn with blast furnace gas in furnace roof, through down-comer, is removed in gravitational precipitator After thicker particle, refined dedusting processing is carried out to blast furnace gas by bag filter.The dust that bag filter is collected is known as cloth Bag ash, gravitational precipitator collect dust be known as gravitational dust, the two is referred to as gas ash, mainly by iron, carbon and Si, Al, Ca, The oxide of Mg forms, and contains low-boiling Pb, zn oxide and alkali metal oxide, is a kind of substance light, grain is micro-, It is one of iron and steel enterprise's primary solids emission.Recently as the expansion of blast furnace ironmaking scale, a large amount of high tile is produced This ash influences blast furnace normal operation, if not implementing to comprehensively utilize, not only makes by being sintered with addition of that alkali metal can be caused to be enriched with At the pollution of environment, while it being also the waste of resource.The disposition of gas ash makes the universal problems faced of iron and steel enterprise, domestic sunshine Steel etc. is handled the iron dust containings solid waste pressure ball direct-reduction such as gas ash, iron scale using rotary hearth furnace, is used for steel-making, but It is of high cost.
Invention content
The object of the present invention is to provide a kind of blast furnace dust comprehensive utilization process, to solve blast furnace dust zinc oxide etc. The problems such as alkali metal content is higher, and sintering is directly returned with causing zinc enrichment to influence blast furnace normal operation.
In order to achieve the above object, the technical solution adopted by the present invention is：
A kind of blast furnace dust comprehensive utilization process, specifically includes following steps：
Step 1: carrying out weak magnetic to blast furnace dust using the screw dry magnetic separator of field strength 2000Oe carries iron；Due to high tile This grey iron content 25-30%, contains ferromagnetic Fe3O4, MFe and weak magnetic martite Fe2O3；Zinc oxide content is higher, Being sintered directly to return to match causes zinc enrichment influence blast furnace normal operation therefore need to carry out the choosing of the alkali metal elements enriched iron such as dezincification Other operation, therefore, using the first ferromagnetism Fe to containing in gas ash of screw dry magnetic separator of field strength 2000Oe3O4, MFe into Row recycling, other elements such as removing C, ZnO, uses for sintered material.
Step 2: the low intensity magnetic separation tail ash that step 1 obtains carries out high intensity magnetic separation using the screw dry magnetic separator of field strength 8000Oe Carry iron；The screw dry magnetic separator that 8000 Oe of field strength is directly entered through the low intensity magnetic separation weak magnetic tail ash that sorts that treated carries out dry type High intensity magnetic separation, the weak magnetic martite Fe contained in recycled dust removing ashes2O3, other elements such as removing C, ZnO, for sintered material It uses.
Step 3: the strong magnetic tail ash that step 2 obtains is incorporated coal dust for fluidized-bed combustion boiler anoxycausis in proportion, until Carbon completely consumes, and zinc fume is discharged with flue gas and is collected into ZnO powder by bag filter cooling, and iron is restored in flyash And enrichment；After weak magnetic, strong magnetic carry iron, C, ZnO are enriched in tail ash, and remain a part of martite Fe2O3.Therefore, Supplying coal dust is used for fluidized-bed combustion boiler under anoxycausis mode, and carbon is consumed through burning, and ZnO is at 1300 DEG C or more Become zinc fume under high-temp combustion state to be discharged with flue gas, cooling collection ZnO powder, remaining red when flue gas passes through bag filter Iron ore Fe2O3It is reduced to ferromagnetic Fe through anoxycausis3O4、MFe。
Step 4: carrying out two sections to the flyash that step 3 obtains using the screw dry magnetic separator of field strength 3000Oe carries iron Processing, flyash is used for cement ingredient after carrying iron；Remaining bloodstone Fe2O3It is reduced to ferromagnetic Fe through anoxycausis3O4、 MFe carries out two sections to flyash by the screw dry magnetic separator of field strength 3000Oe and proposes iron processing, and iron ore concentrate makes for sintered material With flyash is used for cement ingredient or other purposes after carrying iron.
Step 5: the coal ash lifting iron iron ore concentrate that step 4 obtains is carried iron ore concentrate with gas ash weak magnetic, strong magnetic merges product Position reaches 55% or more, and sintered material is sent to use.
Strong magnetic tail ash described in step 3 is incorporated coal dust for fluidized-bed combustion boiler anoxycausis in 2% or more ratio.
Strong magnetic tail ash, that is, carbon mine described in step 3.
The present invention having the beneficial effect that compared to the prior art：
The present invention is directed to blast furnace dust iron content 25-30%, contains ferromagnetic Fe3O4, MFe and weak magnetic martite Fe2O3；Zinc oxide content is higher, sintering directly return with cause zinc enrichment influence blast furnace normal operation the problems such as, develop weak magnetic, Strong magnetic carries iron, electricity generation boiler burning reduction, bag filter cooling receipts zinc, coal ash lifting iron comprehensive utilization process, passes through weak magnetic The iron ore concentrate of 55% or more grade is selected in choosing, high intensity magnetic separation, is stripped of other elements such as C, ZnO, be enriched in strong magnetic tail ash C and ZnO, tail ash is close with fluidized-bed combustion boiler coal powder size, by tail ash in 2% or more ratio supplying coal dust, exists into boiler 1300 DEG C or more high temperature burnings, C are consumed in combustion, and become zinc fume under the ZnO conditions of high temperature is discharged with flue gas Cooled down by bag filter and collects, martite Fe2O3It is reduced to ferromagnetic Fe3O4, MFe enter flyash, by weak Iron ore concentrate is extracted in magnetic separation again, while pyrite, bloodstone in coal dust are reduced into ferromagnetic Fe3O4, MFe select together, It is used for sintered material, flyash is used for cement plant dispensing after carrying iron.
The present invention is higher for alkali metal contents such as blast furnace dust zinc oxide, and sintering, which directly returns to match, causes zinc enrichment to influence The problems such as blast furnace normal operation, develops weak magnetic, strong magnetic carries iron, electricity generation boiler burning restores, zinc, powder are received in bag filter cooling Coal ash carries iron comprehensive utilization process so that the elements effective recycling such as Fe, Zn, C in gas ash, surplus material are incorporated coal dust It is all used for cement ingredient into flyash, realizes whole comprehensive utilizations of blast furnace dust, solve iron and steel enterprise A great problem.
Specific implementation mode
The present invention will be further described With reference to embodiment.
A kind of blast furnace dust comprehensive utilization process, specifically includes following steps：
Step 1: carrying out weak magnetic to blast furnace dust using the screw dry magnetic separator of field strength 2000Oe carries iron；
Step 2: the low intensity magnetic separation tail ash that step 1 obtains carries out high intensity magnetic separation using the screw dry magnetic separator of field strength 8000Oe and carries Iron；
Step 3: the strong magnetic tail ash that step 2 obtains is incorporated coal dust for fluidized-bed combustion boiler anoxycausis, until carbon is complete in proportion Consumption is totally disappeared, zinc fume is discharged with flue gas and is collected into ZnO powder by bag filter cooling, and iron is restored in flyash and richness Collection；
It is carried at iron Step 4: carrying out two sections to the flyash that step 3 obtains using the screw dry magnetic separator of field strength 3000Oe Reason, flyash is used for cement ingredient after carrying iron；
It is reached Step 5: coal ash lifting iron iron ore concentrate that step 4 obtains with gas ash weak magnetic, strong magnetic is carried iron ore concentrate and merges grade To 55% or more, sintered material is sent to use.
Embodiment 1：
The blast furnace dust of Iron grade 25%, ZnO content 3.6%, C content 47% is subjected to following processing：
Step 1: using the screw dry magnetic separator of field strength 2000Oe, weak magnetic is carried out to blast furnace dust and carries iron, weak magnetic iron ore concentrate Grade 57%, concentrate yield 16%, tail ash Iron grade 18.9%, tail ash yield 84%；
Step 2: the low intensity magnetic separation tail ash that step 1 is obtained carries out high intensity magnetic separation using the screw dry magnetic separator of field strength 8000Oe, High intensity magnetic mineral grade 54%, yield 14%, comprehensive yied 11.76%, strong magnetic tail ash Iron grade 13.19%, yield 86%, comprehensive yied 72.24%；
Step 3: strong magnetic tail ash and carbon mine Iron grade 13.19% that step 2 obtains, ZnO content is increased to 4.8%, C by 3.6% Content is increased to 62.67% by 47%, and strong magnetic tail ash power transmission factory is incorporated coal dust for fluidized-bed combustion boiler anoxycausis in 2% ratio, and carbon is complete Consumption is totally disappeared, zinc fume is discharged with flue gas and is collected into ZnO powder, grade 65% by bag filter cooling, and iron obtains in flyash Reduction and enrichment, Iron grade 40.54% after only strong magnetic tail ash is burnt, it is 7% not match flyash iron-holder when reinforcing magnetic tail ash, therefore, It is 6.76% with addition of rear flyash ferrous grade；
It is carried at iron Step 4: carrying out two sections to the flyash that step 3 obtains using the screw dry magnetic separator of field strength 3000Oe Reason, flyash is used for cement ingredient after carrying iron.Two sections of flyash carries iron concentrate grade 56%, to flyash yield 5%, to gas ash Iron ore concentrate yield 14.09% puies forward iron rear molding ash iron content 4.16%, can be used for cement ingredient use；
Step 5: the coal ash lifting iron iron ore concentrate that step 4 obtains is carried iron ore concentrate with gas ash weak magnetic, strong magnetic merges into synthesis Iron ore concentrate, grade 55% send sintered material to use by qualified iron ore concentrate.
After the process, iron resource accounts for 47%, oxidation utilization rate of zinc using 41.85%, carbon utilisation rate is accounted in gas ash It accounts for 3.6%, other 7.55% to use as sintered material with flyash, accomplishes that gas ash 100% utilizes, meanwhile, by iron in flyash Resource also recycles, remarkable benefit.
Embodiment 2：
The blast furnace dust of Iron grade 30%, ZnO content 2.8%, C content 42% is subjected to following processing：
Step 1: using the screw dry magnetic separator of field strength 2000Oe, weak magnetic is carried out to blast furnace dust and carries iron, weak magnetic iron ore concentrate Grade 58%, concentrate yield 20%, tail ash Iron grade 23%, tail ash yield 80%.
Step 2: the low intensity magnetic separation tail ash that step 1 is obtained carries out strong magnetic using the screw dry magnetic separator of field strength 8000Oe Choosing, high intensity magnetic mineral grade 53%, yield 18%, comprehensive yied 14.4%, strong magnetic tail ash Iron grade 16.4%, yield 82%, comprehensive yied 65.6%。
Step 3: strong magnetic tail ash and carbon mine Iron grade 16.4% that step 2 is obtained, ZnO content is increased to by 2.8% 4%, C content is increased to 68.57% by 48%, and strong magnetic tail ash power transmission factory is incorporated coal dust for fluidized-bed combustion boiler anoxycausis in 3% ratio, Carbon completely consumes, and zinc fume is discharged with flue gas and is collected into ZnO powder, grade 63.5% by bag filter cooling, and iron is in flyash In restored and be enriched with, only strong magnetic tail ash burn after Iron grade 55%, it is 6% not match flyash iron-holder when reinforcing magnetic tail ash, because This, is 7.47% with addition of rear flyash ferrous grade.
It is carried Step 4: carrying out two sections to the flyash that step 3 obtains using the screw dry magnetic separator of 3000 Oe of field strength Iron processing, flyash is used for cement ingredient after carrying iron.Two sections of flyash carries iron concentrate grade 60%, to flyash yield 4.5%, right Gas ash iron ore concentrate yield 17.17% puies forward iron rear molding ash iron content 3.4%, can be used for cement ingredient use.
Step 5: carrying iron ore concentrate and merging into the coal ash lifting iron iron ore concentrate that step 4 obtains with gas ash weak magnetic, strong magnetic Comprehensive iron ore concentrate, grade 57.26% send sintered material to use by qualified iron ore concentrate.
After the process, iron resource accounts for 42%, oxidation utilization rate of zinc using 51.57%, carbon utilisation rate is accounted in gas ash It accounts for 2.8%, other 3.63% to use as sintered material with flyash, accomplishes that gas ash 100% utilizes, meanwhile, by iron in flyash Resource also recycles, remarkable benefit.

Claims (3)

1. a kind of blast furnace dust comprehensive utilization process, which is characterized in that specifically include following steps：
Step 1: carrying out weak magnetic to blast furnace dust using the screw dry magnetic separator of field strength 2000Oe carries iron；
Step 2: the low intensity magnetic separation tail ash that step 1 obtains carries out high intensity magnetic separation using the screw dry magnetic separator of field strength 8000Oe and carries Iron；
Step 3: the strong magnetic tail ash that step 2 obtains is incorporated coal dust for fluidized-bed combustion boiler anoxycausis, until carbon is complete in proportion Consumption is totally disappeared, zinc fume is discharged with flue gas and is collected into ZnO powder by bag filter cooling, and iron is restored in flyash and richness Collection；
It is carried at iron Step 4: carrying out two sections to the flyash that step 3 obtains using the screw dry magnetic separator of field strength 3000Oe Reason, flyash is used for cement ingredient after carrying iron；
It is reached Step 5: coal ash lifting iron iron ore concentrate that step 4 obtains with gas ash weak magnetic, strong magnetic is carried iron ore concentrate and merges grade To 55% or more, sintered material is sent to use.
2. blast furnace dust comprehensive utilization process as described in claim 1, it is characterised in that：Strong magnetic tail ash described in step 3 Coal dust is incorporated for fluidized-bed combustion boiler anoxycausis in 2% or more ratio.
3. blast furnace dust comprehensive utilization process as claimed in claim 1 or 2, it is characterised in that：Strong magnetic described in step 3 Tail ash, that is, carbon mine.
CN201810428356.3A 2018-05-07 2018-05-07 A kind of blast furnace dust comprehensive utilization process Pending CN108559852A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201810428356.3A CN108559852A (en) 2018-05-07 2018-05-07 A kind of blast furnace dust comprehensive utilization process

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Application Number Priority Date Filing Date Title
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112458295A (en) * 2020-10-28 2021-03-09 赣州金环磁选设备有限公司 Efficient mineral processing method for recycling iron blast furnace ash

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1765527A (en) * 2005-10-17 2006-05-03 李学曾 Separation technique of blast furnace ferrous fines
CN107619946A (en) * 2017-08-25 2018-01-23 鞍钢股份有限公司 A kind of blast furnace flue gas dedusting ash method of comprehensive utilization

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1765527A (en) * 2005-10-17 2006-05-03 李学曾 Separation technique of blast furnace ferrous fines
CN107619946A (en) * 2017-08-25 2018-01-23 鞍钢股份有限公司 A kind of blast furnace flue gas dedusting ash method of comprehensive utilization

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112458295A (en) * 2020-10-28 2021-03-09 赣州金环磁选设备有限公司 Efficient mineral processing method for recycling iron blast furnace ash

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Application publication date: 20180921

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