CN103290153B - Steel slag treating technology - Google Patents
Steel slag treating technology Download PDFInfo
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- CN103290153B CN103290153B CN201310220422.5A CN201310220422A CN103290153B CN 103290153 B CN103290153 B CN 103290153B CN 201310220422 A CN201310220422 A CN 201310220422A CN 103290153 B CN103290153 B CN 103290153B
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- 239000002893 slag Substances 0.000 title claims abstract description 151
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 87
- 239000010959 steel Substances 0.000 title claims abstract description 87
- 238000005516 engineering process Methods 0.000 title abstract description 6
- 238000012216 screening Methods 0.000 claims abstract description 59
- 238000007885 magnetic separation Methods 0.000 claims abstract description 57
- 238000000034 method Methods 0.000 claims abstract description 25
- 239000002245 particle Substances 0.000 claims abstract description 25
- 238000009628 steelmaking Methods 0.000 claims abstract description 17
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 8
- 238000000746 purification Methods 0.000 claims abstract description 8
- 239000002184 metal Substances 0.000 claims abstract description 5
- 229910052751 metal Inorganic materials 0.000 claims abstract description 5
- 238000013467 fragmentation Methods 0.000 claims description 23
- 238000006062 fragmentation reaction Methods 0.000 claims description 23
- 239000006148 magnetic separator Substances 0.000 claims description 19
- 238000003801 milling Methods 0.000 claims description 13
- 238000000227 grinding Methods 0.000 claims description 11
- 239000000463 material Substances 0.000 claims description 11
- 230000000740 bleeding effect Effects 0.000 claims description 8
- 230000006698 induction Effects 0.000 claims description 8
- 238000005299 abrasion Methods 0.000 claims description 6
- 229920002635 polyurethane Polymers 0.000 claims description 6
- 239000004814 polyurethane Substances 0.000 claims description 6
- 239000000843 powder Substances 0.000 abstract description 5
- 239000004568 cement Substances 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract description 3
- 238000005245 sintering Methods 0.000 abstract description 3
- 229910052742 iron Inorganic materials 0.000 abstract description 2
- 230000007547 defect Effects 0.000 abstract 1
- 229920001971 elastomer Polymers 0.000 description 35
- 239000002994 raw material Substances 0.000 description 4
- 239000000428 dust Substances 0.000 description 3
- 239000000696 magnetic material Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 238000011068 loading method Methods 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 239000002390 adhesive tape Substances 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 238000012769 bulk production Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000012716 precipitator Substances 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
Classifications
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- 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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
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- Manufacture And Refinement Of Metals (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention relates to a steel slag treating technology which can be used for treating steel slag after which is stabilized by adopting a hot and stuffy method. According to the technology, the steel slag is treated by the procedures of screening, crushing, magnetic separation, purification and the like through utilizing the mode of combining an open loop and a closed loop circulation to obtain five high-value-added high-quality products, namely first-type bulk slag steel with the grade of more than or equal to 80% and particle size of 150mm, a second-type bulk slag steel with the grade of more than or equal to 80% and particle size of 50-150mm, slag steel with grade of more than or equal to 85% and particle size of 10-50mm, magnetic separation powder with grade of more than or equal to 42% and particle size of 10mm, and metal iron content (2% of tailings with the particle size of 10mm), wherein the first-type bulk slag steel and the second-type bulk slag steel and the slag steel with the grade of more than or equal to 85% can be returned for steelmaking, the magnetic separation powder can be used for sintering, and the tailings can be used for producing steel slag micropowder as high-activity admixture of cement and concrete and the like. Through the technology, the zero emission of the steel slag can be realized, the defects that the steel slag stored occupies a large area and pollutes the environment can be solved, and the economic benefits of a steel mill can be increased.
Description
Technical field
The present invention relates to a kind of slag Treatment technique for processing, belong to solid waste process field, can fully realize the high added value recycling of slag, realize slag " zero release ".
Background technology
Slag is the industrial solid castoff discharging in iron and steel industry steelmaking process, and generation accounts for 15% left and right of output of steel.Meanwhile, in slag raw material, contain rich in natural resources.The steel that wherein contains 5-10%, can return to process for making and recycle; And slag is again a kind of grog, there is potential hydraulically active after being finely ground to steel-making slag powder, the approach that can develop is very extensive.
At present China's steel slag utilization rate is only 10%, and has obvious gap abroad.Existing slag Treatment technique for processing exists that floor space is large, investment is large, it is not up to standard to pollute, product is unfavorable for the shortcomings such as later use.
Summary of the invention
The object of this invention is to provide that a kind of floor space is little, advanced technology, environment protection standard, production high value added product and lower-cost a kind of slag Treatment technique for processing.
For above-mentioned purpose, main technical schemes of the present invention is that the slag of take after the vexed method stabilization treatment of heat is raw material.Slag heap after the vexed method of heat is processed is stored in raw material plant room, by grab crane and shovel loader, coordinate material loading to the hydraulic pressure of 90 degree of can the tumbling diagrid of tumbling to carry out scalping, the oversize material that screen overflow produces when undesired for steel-making badly bleeding or hot vexed processing, steel-making badly bleeding is bulk slag steel, returning to steel-making uses, the bulk slag that the vexed processing of heat produces when undesired, via returning to the B1 hydraulic pressure diagrid of tumbling after hydraulic breaking hammer fragmentation.Screen underflow enters feed bin, via the oscillating feeder under feed bin, enter rubber conveyer, by the bulk slag steel in slag being selected to the chute entering with diagrid with magnetic machine, screen overflow enters slag steel tank, and screen underflow and residue slag enter hydraulic jaw crusher and carry out fragmentation.Slag after fragmentation sieves by vibratory screening apparatus.Screen underflow is after two roll machine magnetic separation, and magnetic separation enters magnetic separation storehouse, and non-magnetic tailings enters tailings storehouse.After the magnetic separation of screen overflow band magnetic machine, slag steel and slag enter respectively intermediate bin, by the oscillating feeder under intermediate bin, enter respectively that rod mill is purified again and broken, the slag steel after purification enters vibratory screening apparatus and sieves, and screen overflow and screen underflow enter respectively slag steel storehouse and magnetic separation storehouse.Slag after fragmentation enters closed circuit circulatory system, carries out magnetic separation, enters respectively magnetic separation storehouse and tailings storehouse.
Closed circuit circulatory system is: the slag after rod mill fragmentation is had bad luck through rubber conveyer the single roller magnetic separator that enters variable ratio frequency changer speed governing and carried out magnetic separation, magnetic material passes through rubber conveyer, after the magnetic separation of band magnetic machine, enter intermediate bin, enter respectively rod mill broken and that purify.Nonmagnetic material enters the two roll machine of variable ratio frequency changer speed governing by rubber conveyer, magnetic and non-magnetic material enter respectively magnetic separation storehouse and tailings storehouse.
Through operations such as screening, fragmentation, magnetic separation, purifications, the mode of utilizing open circuit and closed cycle to combine, to after slag processing treatment, obtain five kinds of high added value quality productss, be respectively bulk slag steel (>150mm and 50-150mm), the slag steel (10-50mm) of grade >=85%, the tailings (<10mm) of the magnetic separation (<10mm) of grade >=42% and metal Ferrum content <2% of grade >=80%.Wherein bulk slag steel and slag steel can return to steel-making, and magnetic separation can be used for sintering, and tailings can be used for producing as the slag micro powder of cement and concrete highly active mineral admixture etc.
The concrete technical scheme adopting is as follows:
A slag Treatment technique for processing, is characterized in that, it comprises the steps:
(1) slag is carried out to scalping, the slag by scalping is sent to the first magnetic separating unit; By scalping, be not the first bulk slag steel;
(2) first magnetic separating units carry out magnetic separation to the slag that passes through scalping in step (1), the sorting mechanism that the slag steel magneticly electing enters in the first magnetic separating unit screens, by the second bulk slag steel on the sieve of sorting mechanism, be not sent to slag steel tank, by slag steel under the sieve of sorting mechanism, be sent to broken screening unit; The residue slag of not selecting by the first magnetic separating unit is also sent to broken screening unit;
(3) broken screening unit is not to the residue slag of not selecting by the first magnetic separating unit and carrying out fragmentation and screening by slag steel under the sieve of sorting mechanism in step (2), slag under sieve after fragmentation and screening enters the second magnetic separating unit, after the second magnetic separating unit magnetic separation, the magnetic separation of selecting enters magnetic separation storehouse, and the non-magnetic tailings of not selecting enters tailings storehouse; Slag on sieve enters the 3rd magnetic separating unit and carries out magnetic separation, and the slag steel magneticly electing enters rod milling screening unit, and the slag not magneticly electing enters the 4th magnetic separating unit;
Wherein, slag steel enters rod milling screening unit and carries out rod milling screening, and screen overflow enters slag steel storehouse, and screen underflow enters magnetic separation storehouse; Wherein, by the 4th magnetic separating unit, carry out magnetic separation, the slag of not selecting is delivered to the second magnetic separating unit and process, the slag steel that the 4th magnetic separating unit magneticly elects turns back to the 3rd magnetic separating unit to be continued to process.
Wherein the first magnetic separating unit comprises the first band magnetic machine (being B5 band magnetic machine).
Wherein, the first band magnetic machine be two magnetic lace-tied type magnetic separators, and it comprises main magnetic system and secondary magnetic system, and the magnetic induction density of main magnetic system is 150mT, and the magnetic induction density that secondary magnetic is is 100mT (tesla in the least), and magnetic field is adjustable.
Wherein, the sorting mechanism in the first magnetic separating unit is the chute with diagrid, and the aperture of diagrid is 50mm.
Wherein, broken screening unit comprises jaw crusher (B8 jaw crusher) and the first vibratory screening apparatus (being B11 vibratory screening apparatus).
Wherein, the aperture of the first vibratory screening apparatus is 10mm, and the sieve plate of the first vibratory screening apparatus is abrasion resistant polyurethane material.
Wherein, the second magnetic separating unit comprises two roll machine (being B13 two roll machine).
Wherein, the top roll magneticstrength of two roll machine is 140mT; The magneticstrength of lower roll is 180mT, and Frequency Adjustable speed governing.
Wherein, the 3rd magnetic separating unit comprises the second band magnetic machine (being B17 band magnetic machine).
Wherein, the second band magnetic machine be two magnetic lace-tied type magnetic separators, and it comprises main magnetic system and secondary magnetic system, and the magnetic induction density that main magnetic is is 180mT, and the magnetic induction density that secondary magnetic is is 150mT, and magnetic field is adjustable.
Wherein, the 4th magnetic separating unit comprises single roller magnetic separator (being the mono-roller magnetic separator of B25).
Wherein, single roller magnetic separator is that magneticstrength is single roller magnetic separator of 200mT, and variable ratio frequency changer speed governing.
Wherein, the 4th magnetic separating unit also comprises first leg grinding machine (being B22 rod mill), and slag is undertaken after fragmentation and purification by first leg grinding machine, then delivers to single roller magnetic separator and carry out magnetic separation.
Wherein, rod milling screening unit comprises second leg grinding machine (being B31 rod mill) and the second vibratory screening apparatus (being B33 vibratory screening apparatus),
Slag steel is delivered to the second vibratory screening apparatus after adopting second leg grinding machine to carry out fragmentation and purify again and is screened.
Wherein, the aperture of the second vibratory screening apparatus (being B33 vibratory screening apparatus) is 10mm, and the sieve plate of the second vibratory screening apparatus is abrasion resistant polyurethane material.
Wherein, scalping adopts the hydraulic pressure of 90 degree of can the tumbling diagrid (B1 hydraulic pressure tumble diagrid) of tumbling.Slag is carried out after scalping, not by the hydraulic pressure bulk slag steel that the first bulk slag steel of diagrid produces when undesired for steel-making badly bleeding or hot vexed processing of tumbling, steel-making badly bleeding is particle diameter > 150mm slag steel, returning to steel-making uses, the bulk slag steel that the vexed processing of heat produces when undesired, via the diagrid of tumbling of hydraulic return after hydraulic breaking hammer fragmentation.
Wherein, grade >=80% of the first bulk slag steel by scalping not, particle diameter >150mm; Grade >=80% of described the second bulk slag steel that the first magnetic separating unit is selected, particle diameter is 50-150mm; The slag steel that screen overflow after rod milling screening is grade >=85%, its particle diameter is 10-50mm, it enters slag steel storehouse, the magnetic separation that the screen underflow after rod milling screening is grade >=42%, its particle diameter <10mm, it enters magnetic separation storehouse; After the second magnetic separating unit magnetic separation, magnetic separation grade >=42% of selecting, its particle diameter <10mm, it enters described magnetic separation storehouse, the non-magnetic tailings of not selecting enters tailings storehouse, the metal Ferrum content <2% of tailings wherein, particle diameter <10mm.
The present invention has advantages of as follows:
(1) product is reasonable, and added value is high, is conducive to later use.Five kinds of products are respectively the first bulk slag steel (particle diameter >150mm) of grade >=80%, the slag steel (particle diameter is 10-50mm) of the second bulk slag steel (particle diameter is 50-150mm) of grade >=80%, grade >=85%, the magnetic separation (particle diameter <10mm) of grade >=42% and the tailings (particle diameter <10mm) of metal Ferrum content <2%.Wherein the slag steel of the first and the second bulk slag steel and grade >=85% can return to steel-making, and magnetic separation can be used for sintering, and tailings can be used for producing as the slag micro powder of cement and concrete highly active mineral admixture etc.
(2) for different slags, select distinct device, equipment is rationally advanced.
(3) screening: this process using four road screenings.Bulk slag selects the hydraulic pressure of 90 degree of can the tumbling diagrid of tumbling to sieve, and screening efficiency is high, can effectively prevent putty, and cleaning is convenient.The first slag steel of selecting with magnetic machine has the chute of diagrid to sieve through inside, can improve the grade of slag steel in slag steel tank, and make full use of space.Slag after jaw crushing crusher machine selects treatment capacity large, and the circle that sieve plate is abrasion resistant polyurethane shakes and sieves.It is that the circle of abrasion resistant polyurethane shakes and sieves that slag steel after rod mill is purified is selected sieve plate.
(4) magnetic separation: this process using four road magnetic separation.It is that two magnetic lace-tied type magnetic separators of 150/100mT carry out magnetic separation that bulk slag is selected magneticstrength, and magnetic field is adjustable.It is that two magnetic lace-tied type magnetic separators of 180/150mT carry out magnetic separation that screen overflow after second screening is selected magneticstrength, and magnetic field is adjustable.Screen underflow after second screening is selected top roll 140mT, and the two roll machine of lower roll 180mT carries out magnetic separation, and variable ratio frequency changer speed governing.Slag after rod mill fragmentation selects single roller magnetic separator of 200mT to carry out magnetic separation, and variable ratio frequency changer speed governing.
(5) broken and purification.This technique twice are broken, purify together.With the jaw crusher of hydraulic protecting, be used for the fragmentation of first bulk slag, can prevent from getting stuck, crushing effect is good.The slag that band magnetic machine magneticly elects and slag steel enter respectively corresponding rod mill and carry out fragmentation and purification.The feature of slag Special crushing rod mill is that in grinding process, grinding media is line with material and contacts, thereby has certain Selective grinding effect, and product granularity is more even, crosses pulverizing ore particle few.The special-purpose purification rod mill of slag can be peeled off the slag of slag steel surface attachment, improves slag steel grade.
(6) floor space is little, compact and reasonable arrangement.Approximately 10 mu of this technique floor spaces, compare with the similar engineering of same scale and product, save and take up an area more than 30%.
(7) Environmental Protection Level is high, and pollutant emission is up to standard.This equipment cooling water cycle is used, non-wastewater discharge.Each airborne dust point adopts Oligodynamic single-machine dust-precipitator to carry out airtight trapping to dust, and the dust of trapping becomes the bulk production line use that falls back.Each construction of structures is all sealed, and production line noise is up to standard.
Accompanying drawing explanation
Fig. 1 is the application's process flow sheet
Embodiment
400,000 tons/year of slag processing treatment production lines of Xian Yimou steel mill are that example describes this technique:
Slag heap after heat is vexed is stored in raw material plant room, can store up about 4 days, slag after ageing is by grab crane and wheel loader material loading to the B1 hydraulic pressure diagrid (150mm * 150mm) of tumbling, screen underflow enters feed bin, the oversize material that screen overflow produces when undesired for steel-making badly bleeding or hot vexed processing, steel-making badly bleeding is > 150mm slag steel, returning to steel-making uses, the bulk slag that the vexed processing of heat produces when undesired, via returning to the B1 hydraulic pressure diagrid of tumbling after hydraulic breaking hammer fragmentation.Screen underflow enters B3 rubber conveyer via the B2 oscillating feeder under feed bin, be transported to again B4 rubber conveyer, B4 rubber conveyer overhung has B5 band magnetic machine, B5 selects the bulk slag steel in slag by inside and is provided with the chute that aperture is 50mm diagrid with magnetic machine, screen overflow (50mm-150mm) enters slag steel tank, and screen underflow and magnetic separation residue slag is had bad luck to B8 hydraulic jaw crusher and carried out fragmentation by B6 rubber conveyer.It is that the B11 vibratory screening apparatus of 10mm sieves that slag after fragmentation (< 50mm) is delivered to aperture through B9 rubber conveyer.The B5 that wherein the first magnetic separating unit comprises B2 oscillating feeder, B3 rubber conveyer, B4 rubber conveyer, B4 rubber conveyer overhung is with magnetic machine and have a chute that aperture is 50mm diagrid.Broken screening unit comprises B6 rubber conveyer, B8 hydraulic jaw crusher, B9 rubber conveyer and B11 vibratory screening apparatus.
B11 vibratory screening apparatus screen underflow (slag of < 10mm) enters B13 two roll machine through B12 rubber conveyer and B43 oscillating feeder, the magnetic separation of the < 10mm selecting through magnetic separation enters magnetic separation storehouse, non-magnetic tailings enters B14 rubber conveyer, and the belt plow on B14 rubber conveyer is discharged into tailings storehouse by tailings.The second magnetic separating unit comprises B12 rubber conveyer, B43 oscillating feeder, B13 two roll machine and B14 rubber conveyer.
B11 vibratory screening apparatus screen overflow (slag of 10-50mm) enters B16 rubber conveyer, and B16 head of adhesive tape conveyor is hung with B17 band magnetic machine, and the slag steel of the 10-50mm selecting through magnetic separation enters 2# intermediate bin, and non-magnetic slag enters 1# intermediate bin.Slag in 1# intermediate bin is sent into B21 oscillating feeder by B19 oscillating feeder through B20 rubber conveyer, B21 oscillating feeder is sent slag into B22 rod mill, slag after the fragmentation of B22 rod mill is had bad luck the rubber conveyer to B24 through B23 rubber conveyer, by B42 oscillating feeder, enter the mono-roller magnetic separator of B25 again and carry out magnetic separation, magnetic material enters B16 rubber conveyer through B26 oscillating feeder, turns back to the 3rd magnetic separating unit and continues to process.Nonmagnetic material enters B12 rubber conveyer, by the second magnetic separating unit, processes.Slag steel in 2# intermediate bin is sent into B30 oscillating feeder by B28 oscillating feeder through B29 rubber conveyer, B30 oscillating feeder is sent slag steel into B31 rod mill, slag steel after B31 rod mill is purified is delivered to through B32 rubber conveyer the B33 vibratory screening apparatus that aperture is 10mm, B33 vibratory screening apparatus screen overflow enters slag steel storehouse, and screen underflow is delivered to magnetic separation storehouse through B34 rubber conveyer by B35 oscillating feeder.The 3rd magnetic separating unit comprises B16 rubber conveyer and B17 band magnetic machine.The 4th magnetic separating unit comprises the mono-roller magnetic separator of 1# intermediate bin, B19 oscillating feeder, B20 rubber conveyer, B21 oscillating feeder, B22 rod mill, B23 rubber conveyer, B24 rubber conveyer, B42 oscillating feeder and B25.Rod milling screening unit comprises 2# intermediate bin, B28 oscillating feeder, B29 rubber conveyer, B30 oscillating feeder, B31 rod mill, B32 rubber conveyer, B33 vibratory screening apparatus, B34 rubber conveyer and B35 oscillating feeder.
Claims (1)
1. a slag Treatment technique for processing, is characterized in that, it comprises the steps:
(1) slag is carried out to scalping, the slag by scalping is sent to the first magnetic separating unit; By scalping, be not the first bulk slag steel;
(2) first magnetic separating units carry out magnetic separation to the slag that passes through scalping in step (1), the sorting mechanism that the slag steel magneticly electing enters in the first magnetic separating unit screens, by the second bulk slag steel on the sieve of sorting mechanism, be not sent to slag steel tank, by slag steel under the sieve of sorting mechanism, be sent to broken screening unit; The residue slag of not selecting by the first magnetic separating unit is also sent to broken screening unit;
(3) broken screening unit is not to the residue slag of not selecting by the first magnetic separating unit and carrying out fragmentation and screening by slag steel under the sieve of sorting mechanism in step (2), slag under sieve after fragmentation and screening enters the second magnetic separating unit, after the second magnetic separating unit magnetic separation, the magnetic separation of selecting enters magnetic separation storehouse, and the non-magnetic tailings of not selecting enters tailings storehouse; Slag on sieve enters the 3rd magnetic separating unit and carries out magnetic separation, and the slag steel magneticly electing enters rod milling screening unit, and the slag not magneticly electing enters the 4th magnetic separating unit;
Wherein, slag steel enters rod milling screening unit and carries out rod milling screening, and screen overflow enters slag steel storehouse, and screen underflow enters magnetic separation storehouse; Wherein, by the 4th magnetic separating unit, carry out magnetic separation, the slag of not selecting is delivered to the second magnetic separating unit and process, the slag steel that the 4th magnetic separating unit magneticly elects turns back to the 3rd magnetic separating unit to be continued to process;
Wherein, the first magnetic separating unit comprises the first band magnetic machine, and the first band magnetic machine be two magnetic lace-tied type magnetic separators, and it comprises main magnetic system and secondary magnetic system, and the magnetic induction density that main magnetic is is 150mT, and the magnetic induction density that secondary magnetic is is 100mT, and magnetic field is adjustable; Sorting mechanism in the first magnetic separating unit is the chute with diagrid, and the aperture of diagrid is 50mm, and broken screening unit comprises jaw crusher and the first vibratory screening apparatus, and wherein the aperture of the first vibratory screening apparatus is 10mm, and the sieve plate of the first vibratory screening apparatus is abrasion resistant polyurethane material; The second magnetic separating unit comprises two roll machine; The top roll magneticstrength of two roll machine is 140mT; The magneticstrength of lower roll is 180mT, and Frequency Adjustable speed governing; The 3rd magnetic separating unit comprises the second band magnetic machine; The second band magnetic machine be two magnetic lace-tied type magnetic separators, and it comprises main magnetic system and secondary magnetic system, and the magnetic induction density that main magnetic is is 180mT, and the magnetic induction density that secondary magnetic is is 150mT, and magnetic field is adjustable; The 4th magnetic separating unit comprises single roller magnetic separator; Single roller magnetic separator is that magneticstrength is single roller magnetic separator of 200mT, and variable ratio frequency changer speed governing; The 4th magnetic separating unit also comprises first leg grinding machine, and slag is undertaken after fragmentation and purification by first leg grinding machine, then delivers to single roller magnetic separator and carry out magnetic separation; Rod milling screening unit comprises second leg grinding machine and the second vibratory screening apparatus, and slag steel is delivered to the second vibratory screening apparatus after adopting second leg grinding machine to carry out fragmentation and purify again and screened; Wherein the aperture of the second vibratory screening apparatus is 10mm, and the sieve plate of the second vibratory screening apparatus is abrasion resistant polyurethane material; Scalping adopts the hydraulic pressure of 90 degree of can the tumbling diagrid of tumbling, slag is carried out after scalping, not by the hydraulic pressure bulk slag steel that the first bulk slag steel of diagrid produces when undesired for steel-making badly bleeding or hot vexed processing of tumbling, steel-making badly bleeding is particle diameter > 150mm slag steel, returning to steel-making uses, the bulk slag steel that the vexed processing of heat produces when undesired, via the diagrid of tumbling of hydraulic return after hydraulic breaking hammer fragmentation; Grade >=80% of the first bulk slag steel by scalping not, particle diameter >150mm; Grade >=80% of described the second bulk slag steel that the first magnetic separating unit is selected, particle diameter is 50-150mm; The slag steel that screen overflow after rod milling screening is grade >=85%, its particle diameter is 10-50mm, it enters slag steel storehouse, the magnetic separation that the screen underflow after rod milling screening is grade >=42%, its particle diameter <10mm, it enters magnetic separation storehouse; After the second magnetic separating unit magnetic separation, magnetic separation grade >=42% of selecting, its particle diameter <10mm, it enters described magnetic separation storehouse, the non-magnetic tailings of not selecting enters tailings storehouse, the metal Ferrum content <2% of tailings wherein, particle diameter <10mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310220422.5A CN103290153B (en) | 2013-06-05 | 2013-06-05 | Steel slag treating technology |
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| CN201310220422.5A CN103290153B (en) | 2013-06-05 | 2013-06-05 | Steel slag treating technology |
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| CN103290153A CN103290153A (en) | 2013-09-11 |
| CN103290153B true CN103290153B (en) | 2014-10-22 |
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