CN108704762A - A kind of blast furnace dust magnetic kind magnetization dry separation iron-extracting process - Google Patents
A kind of blast furnace dust magnetic kind magnetization dry separation iron-extracting process Download PDFInfo
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- CN108704762A CN108704762A CN201810428357.8A CN201810428357A CN108704762A CN 108704762 A CN108704762 A CN 108704762A CN 201810428357 A CN201810428357 A CN 201810428357A CN 108704762 A CN108704762 A CN 108704762A
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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
- B03C1/005—Pretreatment specially adapted for magnetic separation
- B03C1/01—Pretreatment specially adapted for magnetic separation by addition of magnetic adjuvants
Abstract
The present invention relates to a kind of blast furnace dust magnetic kinds to magnetize dry separation iron-extracting process, and main technological steps are as follows：Weak magnetic is carried out to blast furnace dust using the screw dry magnetic separator of field strength 2500Oe and carries iron, low intensity magnetic separation tail ash is incorporated 5-10% flyash magnetic kinds, it is heated up to 70 DEG C of sealing strength mixing magnetization, sorting process is carried out to the tail ash after magnetization using the screw dry magnetic separator of 3500 Oe of field strength, inferior fine magnetite concentrate and magnetic kind magnetization sorting concentrate merge into comprehensive iron ore concentrate, and grade reaches 55% or more, and magnetic kind does not recycle, it is used as sintered material with iron ore concentrate, carries iron rear molding ash and used for recycling ZnO processing.The present invention has that zinc enrichment influences blast furnace normal operation for blast furnace dust for sintered material use, for the high feature of iron ion degree of dissociation in gas ash, develop weak magnetic, the magnetization sorting of magnetic kind carries iron and utilizes technique, the enrichment of iron ore concentrate iron, tail ash ZnO enrichments processing are carried out, solves the problems, such as that the high zinc gas ash stockpiling in part influences environment.
Description
Technical field
The invention belongs to technical field of mineral processing, are related to the aftertreatment technology of blast furnace ironmaking process, and in particular to a kind of
Blast furnace dust magnetic kind magnetizes dry separation iron-extracting 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 present invention is directed to blast furnace dust iron content 25-30%, contains ferromagnetic Fe3O4, MFe and weak magnetic the red iron of illusion
Mine Fe2O3；The problems such as zinc oxide content is higher, and sintering is directly returned with causing zinc enrichment to influence blast furnace normal operation, provides one kind
Blast furnace dust magnetic kind magnetizes dry separation iron-extracting process.
To solve the above-mentioned problems, the present invention specifically adopts the following technical scheme that：
A kind of blast furnace dust magnetic kind magnetization dry separation iron-extracting process, specifically includes following steps：
Step A. uses the hermetically sealed screw dry magnetic separator of field strength 2000Oe, and carrying out weak magnetic to blast furnace dust carries iron, recycles
Ferromagnetic Fe3O4；
With addition of 5-10% flyash magnetic kinds in the weak magnetic tail ash that step B. steps A is obtained, it is heated up to 70 DEG C of strength mixing magnetization, iron
Ion is assembled using magnetic kind as karyomorphism at magnetic；
Step C. magnetization rear molding ashes are sorted using the hermetically sealed screw dry magnetic separator of field strength 3000Oe, extract blast furnace dedusting ash
In the weak magnetic Fe that contains2O3, comprehensive iron ore concentrate, grade are merged into the weak magnetic concentrate selection of magnetic kind magnetization sorting concentrate and step A
Reach 55% or more, magnetic kind does not recycle, and is used as sintered material with iron ore concentrate, carries iron rear molding ash for extracting the useful member such as ZnO
The raw material of element.
Above-mentioned raw materials, product overall process are using ore storage bin, pneumatic pipe storage and conveying, without environmentally friendly risk；
Blast furnace dust iron content 25-30% described in step A of the present invention, contains ferromagnetic Fe3O4, MFe and weak magnetic illusion
Bloodstone Fe2O3；Zinc oxide content is higher, and sintering, which directly returns to match, causes zinc enrichment to influence blast furnace normal operation, need to carry out dezincification etc.
The sorting operation of alkali metal element enriched iron, therefore, using the screw dry magnetic separator of field strength 2500Oe first to containing in gas ash
Some ferromagnetism Fe3O4, MFe recycled, the other elements of removing C, ZnO etc. are used for sintered material.
The a large amount of weak magnetic Fe contained in the blast furnace dust of the present invention2O3, sort mode using traditional and can not be enriched with
Ferro element removes alkali metal, therefore, using with addition of 5-10% flyash magnetic kinds or roasted ore magnetic kind, the magnetization of strength mixing, iron ion
Assemble at magnetic using magnetic kind as karyomorphism, then low intensity magnetic separation is used to carry out sorting process.The flyash magnetic kind of selection is from flyash
The magnetic bead of dry separation extraction, it is flyash magnetic kind to produce -0.048mm partly by grading, grade 57%, and specific susceptibility is
90000-95000（1×10-9m3/kg）, there are Fly ash bead natural many micropores, porosity to reach 50-85%, be a kind of
Without the magnetic kind of chemical modification.
Step C of the present invention is since degree of dissociation is relatively high, through the magnetized weak magnetic Fe of magnetic kind2O3Magnetic aggregation is formed, using field strength
The hermetically sealed screw dry magnetic separator of 3500Oe sorts, and can effectively extract the weak magnetic Fe contained in dedusting ash2O3, after carrying iron
Tail ash is used to extract the raw material of the useful elements such as ZnO.
The beneficial effects of the invention are as follows：The present invention is higher for alkali metal contents such as blast furnace dust zinc oxide, and sintering is straight
It takes back and matches the problems such as causing zinc enrichment to influence blast furnace normal operation, develop weak magnetic, the magnetization sorting of magnetic kind using technique, by weak
Magnetic separation, the magnetization of magnetic kind sub-elect the iron ore concentrate of 55% or more grade, are stripped of the elements such as ZnO, C, are used for sintered material, carry iron
Rear molding ash is enriched the elements such as ZnO, C, creates condition for elements such as extraction ZnO, C, reduces next procedure and recycle useful element
Treating capacity, reduce processing cost, realize whole comprehensive utilizations of blast furnace dust, solve a disaster of iron and steel enterprise
Topic.
Description of the drawings
A kind of blast furnace dust magnetic kinds of Fig. 1 magnetize dry separation iron-extracting process flow chart.
Specific implementation mode
The present invention implements the sintering dust separation ash used and derives from wine steel iron-smelter.
Embodiment 1
A kind of blast furnace dust magnetic kind magnetization dry separation iron-extracting process, specifically includes following steps：
The blast furnace dust of Iron grade 25%, ZnO content 3.6%, C content 47% is subjected to following processing：
Step A. uses the screw dry magnetic separator of field strength 2500Oe, and carrying out weak magnetic to above-mentioned blast furnace dust proposes iron, low intensity magnetic separation
Concentrate grade 57%, concentrate yield 16%, low intensity magnetic separation tail ash Iron grade 18.9%, tail ash yield 84%.
With addition of 5% flyash magnetic kind, grade 56%, specific susceptibility 90000 in step B. low intensity magnetic separation tail ashes（1×10- 9m3/kg）, 70 DEG C of strength mixing magnetization are heated up to, iron ion is assembled using magnetic kind as karyomorphism at magnetic；
Step C. steps B magnetization rear molding ashes are sorted using the hermetically sealed screw dry magnetic separator of field strength 3500Oe, and extraction blast furnace removes
The weak magnetic Fe contained in dust2O3, consider under magnetic kind whole recovering state, it is magnetization sorting concentrate grade 54%, yield 30%, comprehensive
Close yield 25.2%, magnetization sorting tail ash Iron grade 3.86%, yield 70%, comprehensive yied 58.8%.Magnetic kind magnetization sorting concentrate and
The weak magnetic concentrate selection of step A merges into comprehensive iron ore concentrate, grade 55%, yield 41.2%, and magnetic kind does not recycle, with iron ore concentrate as burning
Dispensing is tied to use.
After above-mentioned process, carries the synthesis iron ore concentrate after iron enrichment and used for sintered material, final tail ash can be made
For the raw material of the valuable elements such as extraction ZnO.
Above-mentioned raw materials, product overall process are using ore storage bin, pneumatic pipe storage and conveying, without environmentally friendly risk.
Embodiment 2
A kind of blast furnace dust magnetic kind magnetization dry separation iron-extracting process, specifically includes following steps：
The blast furnace dust of Iron grade 30%, ZnO content 2.8%, C content 42% is subjected to following processing：
Step A. uses the screw dry magnetic separator of field strength 2500Oe, and carrying out weak magnetic to above-mentioned blast furnace dust proposes iron, low intensity magnetic separation
Concentrate grade 58%, concentrate yield 20%, low intensity magnetic separation tail ash Iron grade 23%, tail ash yield 80%.
With addition of 10% flyash magnetic kind, grade 56%, specific susceptibility 95000 in step B. low intensity magnetic separation tail ashes（1×10-9m3/kg）, 70 DEG C of strength mixing magnetization are heated up to, iron ion is assembled using magnetic kind as karyomorphism at magnetic；
Step C. steps B magnetization rear molding ashes are sorted using the hermetically sealed screw dry magnetic separator of field strength 3500Oe, and extraction blast furnace removes
The weak magnetic Fe contained in dust2O3, consider under magnetic kind whole recovering state, it is magnetization sorting concentrate grade 55%, yield 35%, comprehensive
Close yield 28%, magnetization sorting tail ash Iron grade 5.77%, yield 65%, comprehensive yied 52%.Magnetic kind magnetization sorting concentrate and step A
Weak magnetic concentrate selection merge into comprehensive iron ore concentrate, grade 56.25%, yield 48%, magnetic kind does not recycle, with iron ore concentrate as sintering match
Material uses.
After above-mentioned process, carries the synthesis iron ore concentrate after iron enrichment and used for sintered material, final tail ash can be made
For the raw material of the valuable elements such as extraction ZnO.
Above-mentioned raw materials, product overall process are using ore storage bin, pneumatic pipe storage and conveying, without environmentally friendly risk.
Claims (4)
1. a kind of blast furnace dust magnetic kind magnetizes dry separation iron-extracting process, it is characterised in that：Specifically include following steps：
Step A. uses the hermetically sealed screw dry magnetic separator of field strength 2000Oe, and carrying out weak magnetic to blast furnace dust carries iron, recycles
Ferromagnetic Fe3O4；
With addition of 5-10% flyash magnetic kinds in the weak magnetic tail ash that step B. steps A is obtained, it is heated up to 70 DEG C of strength mixing magnetization, iron
Ion is assembled using magnetic kind as karyomorphism at magnetic；
Step C. magnetization rear molding ashes are sorted using the hermetically sealed screw dry magnetic separator of field strength 3000Oe, extract blast furnace dedusting ash
In the weak magnetic Fe that contains2O3, comprehensive iron ore concentrate, grade are merged into the weak magnetic concentrate selection of magnetic kind magnetization sorting concentrate and step A
Reach 55% or more, magnetic kind does not recycle, and is used as sintered material with comprehensive iron ore concentrate, it is useful for extracting ZnO to carry iron rear molding ash
The raw material of element.
2. a kind of blast furnace dust magnetic kind as described in claim 1 magnetizes dry separation iron-extracting process, it is characterised in that：Step A institutes
The blast furnace dust iron content 25-30% stated, including ferromagnetic Fe3O4, MFe and weak magnetic martite Fe2O3；Also contain
C, ZnO aoxidizes Zn-ef ficiency.
3. a kind of blast furnace dust magnetic kind as described in claim 1 magnetizes dry separation iron-extracting process, it is characterised in that：Step B institutes
The flyash magnetic kind stated is the magnetic bead that dry separation is extracted from flyash, and it is flyash to produce the parts -0.048mm by grading
Magnetic kind, grade 57%, specific susceptibility 90000-95000,1 × 10-9m3/ kg, Fly ash bead micropore rate are 50-85%
Magnetic kind.
4. a kind of blast furnace dust magnetic kind as described in claim 1 magnetizes dry separation iron-extracting process, it is characterised in that：Step B institutes
It is substituted with addition of 5-10% flyash magnetic kind 5-10% roasted ore magnetic kinds in the low intensity magnetic separation tail ash stated.
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| CN103215437A (en) * | 2013-03-18 | 2013-07-24 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Method for producing beaded iron by using nickel slag, blast furnace gas ash and steel OG mud |
| CN105903562A (en) * | 2016-04-18 | 2016-08-31 | 武汉科技大学 | Method for extracting iron ore concentrate from flyash |
| CN107604110A (en) * | 2017-08-25 | 2018-01-19 | 鞍钢股份有限公司 | A kind of method that iron is selected from blast furnace dust |
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| CN1765527A (en) * | 2005-10-17 | 2006-05-03 | 李学曾 | Separation technique of blast furnace ferrous fines |
| CN101069872A (en) * | 2007-03-16 | 2007-11-14 | 东南大学 | Method for removal of inhalable particles in coal |
| CN101343693A (en) * | 2007-07-12 | 2009-01-14 | 南京板桥钢渣有限责任公司 | Dust-separation zinc extraction method |
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| CN201275501Y (en) * | 2008-10-06 | 2009-07-22 | 潍坊华美电磁机械科技有限公司 | Environment-friendly dry-type magnetic separation machine |
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Application publication date: 20181026 |
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