CN103290153A - Steel slag treating technology - Google Patents
Steel slag treating technology Download PDFInfo
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- CN103290153A CN103290153A CN2013102204225A CN201310220422A CN103290153A CN 103290153 A CN103290153 A CN 103290153A CN 2013102204225 A CN2013102204225 A CN 2013102204225A CN 201310220422 A CN201310220422 A CN 201310220422A CN 103290153 A CN103290153 A CN 103290153A
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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
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- 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
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 processing treatment technology, belong to the 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 that discharges in the iron and steel industry steelmaking process, and generation accounts for about 15% of output of steel.Simultaneously, contain rich in natural resources in the slag raw material.The steel that wherein contains 5-10% can return process for making and recycle; And slag is again a kind of grog, has potential hydraulically active after being finely ground to steel-making slag powder, and the approach that can develop is very extensive.
At present China's steel slag utilization rate only is 10%, and obvious gap is arranged abroad.Existing slag processing treatment technology exists that floor space is big, investment is big, it is not up to standard to pollute, product is unfavorable for shortcomings such as later use.
Summary of the invention
The purpose 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 processing treatment technology.
At above-mentioned purpose, main technical schemes of the present invention is to be raw material with the slag after the vexed method stabilization treatment of heat.Slag after the vexed method processing of heat is stored up in the raw material factory building, cooperate material loading to the hydraulic pressure of 90 degree of can the tumbling diagrid of tumbling to carry out scalping by grab crane and shovel loader, the oversize material that screen overflow produces when undesired for steel-making badly bleeding or hot vexed processing, the steel-making badly bleeding is bulk slag steel, returning steel-making uses, the bulk slag that the vexed processing of heat produces when undesired is via returning the B1 hydraulic pressure diagrid of tumbling after the hydraulic breaking hammer fragmentation.Screen underflow enters feed bin, enter rubber conveyer via the oscillating feeder under the feed bin, enter the chute that has diagrid by being with the magnetic machine that the bulk slag steel in the slag is selected, screen overflow enters the slag steel tank, and screen underflow and residue slag enter hydraulic jaw crusher and carry out fragmentation.Slag after the fragmentation sieves by vibratory screening apparatus.Screen underflow is after the two roll machine magnetic separation, and magnetic separation enters the magnetic separation storehouse, and non-magnetic tailings enters the tailings storehouse.Screen overflow is after the magnetic separation of band magnetic machine, slag steel and slag enter intermediate bin respectively, enter respectively by the oscillating feeder under the intermediate bin that rod mill is purified again and broken, the slag steel after the purification enters vibratory screening apparatus and sieves, and screen overflow and screen underflow enter slag steel storehouse and magnetic separation storehouse respectively.Slag after the fragmentation enters closed circuit circulatory system, carries out magnetic separation, enters magnetic separation storehouse and tailings storehouse respectively.
Closed circuit circulatory system is: the slag after the rod mill fragmentation is had bad luck the single roller magnetic separator that enters the variable ratio frequency changer speed governing through rubber conveyer and is carried out magnetic separation, magnetic material passes through rubber conveyer, after the magnetic separation of band magnetic machine, enter intermediate bin, enter rod mill broken and that purify respectively.Nonmagnetic material enters the two roll machine of variable ratio frequency changer speed governing by rubber conveyer, and magnetic and non-magnetic material enter magnetic separation storehouse and tailings storehouse respectively.
Through operations such as screening, fragmentation, magnetic separation, purifications, the mode of utilizing open circuit and closed cycle to combine, will be after the slag processing treatment obtain five kinds of high added value quality productss, be respectively bulk slag steel (〉 150mm and the 50-150mm of grade 〉=80%), the magnetic separation of the slag steel (10-50mm) of grade 〉=85%, grade 〉=42% (＜10mm) and the tailings of metal Ferrum content＜2% (＜10mm).Wherein bulk slag steel and slag steel can return steel-making, and magnetic separation can be used for sintering, and tailings can be used for producing slag micro powder as cement and concrete highly active mineral admixture etc.
The concrete technical scheme that adopts is as follows:
A kind of slag processing treatment technology is characterized in that it comprises the steps:
(1) slag is carried out scalping, the slag by scalping is sent to first magnetic separating unit; Be not first kind of bulk slag steel by scalping;
(2) first magnetic separating units carry out magnetic separation to the slag that passes through scalping in the step (1), the sorting mechanism that the slag steel that magneticly elects enters in first magnetic separating unit screens, be not sent to the slag steel tank by the last second kind of bulk slag steel of the sieve of sorting mechanism, be sent to broken screening unit by slag steel under the sieve of sorting mechanism; The residue slag of selecting by first magnetic separating unit is not sent to broken screening unit yet;
(3) the broken unit that screens is to carrying out fragmentation and screening less than the residue slag of selecting by first magnetic separating unit with by slag steel under the sieve of sorting mechanism in the step (2), slag under the sieve after fragmentation and the screening enters second magnetic separating unit, after the second magnetic separating unit magnetic separation, the magnetic separation of selecting enters the magnetic separation storehouse, and the non-magnetic tailings of not selecting enters the tailings storehouse; Slag on the sieve enters the 3rd magnetic separating unit and carries out magnetic separation, and the slag steel that magneticly elects enters rod milling screening unit, and the slag that does not magneticly elect enters the 4th magnetic separating unit;
Wherein, the slag steel enters rod milling screening unit and carries out the rod milling screening, and screen overflow enters slag steel storehouse, and screen underflow enters the magnetic separation storehouse; Wherein, carry out magnetic separation by the 4th magnetic separating unit, the slag that will not select is delivered to second magnetic separating unit and is handled, and the slag steel that the 4th magnetic separating unit magneticly elects turns back to the 3rd magnetic separating unit to be continued to handle.
Wherein 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 can be regulated.
Wherein, the sorting mechanism in first magnetic separating unit is the chute with diagrid, and the aperture of diagrid is 50mm.
Wherein, the broken unit that screens comprises jaw crusher (B8 jaw crusher) and first vibratory screening apparatus (being the B11 vibratory screening apparatus).
Wherein, the aperture of first vibratory screening apparatus is 10mm, and the sieve plate of first vibratory screening apparatus is the abrasion resistant polyurethane material.
Wherein, second magnetic separating unit comprises two roll machine (being the B13 two roll machine).
Wherein, the top roll magneticstrength of two roll machine is 140mT; The magneticstrength of lower roll is 180mT, and the 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 can be regulated.
Wherein, the 4th magnetic separating unit comprises single roller magnetic separator (being the single roller magnetic separator of B25).
Wherein, single roller magnetic separator is that magneticstrength is single roller magnetic separator of 200mT, and the variable ratio frequency changer speed governing.
Wherein, the 4th magnetic separating unit also comprises first leg grinding machine (being the B22 rod mill), and slag is delivered to single roller magnetic separator again and carried out magnetic separation after carrying out fragmentation and purification by first leg grinding machine.
Wherein, rod milling screening unit comprises second leg grinding machine (being the B31 rod mill) and second vibratory screening apparatus (being the B33 vibratory screening apparatus),
Delivering to second vibratory screening apparatus again after the slag steel adopts second leg grinding machine to carry out fragmentation and purify screens.
Wherein, the aperture of second vibratory screening apparatus (being the B33 vibratory screening apparatus) is 10mm, and the sieve plate of second vibratory screening apparatus is the abrasion resistant polyurethane material.
Wherein, the hydraulic pressure of 90 degree of can the tumbling diagrid (B1 hydraulic pressure tumble diagrid) of tumbling is adopted in scalping.After slag carried out scalping, not by the hydraulic pressure bulk slag steel that first kind of bulk slag steel of diagrid produce when undesired for steel-making badly bleeding or hot vexed processing of tumbling, the steel-making badly bleeding is particle diameter＞150mm slag steel, returning steel-making uses, the bulk slag steel that the vexed processing of heat produces when undesired is via the diagrid of tumbling of hydraulic return after the hydraulic breaking hammer fragmentation.
Wherein, grade 〉=80% of first kind of bulk slag steel by scalping not, particle diameter〉150mm; Grade 〉=80% of described second kind of bulk slag steel that first magnetic separating unit is selected, particle diameter is 50-150mm; Screen overflow after the rod milling screening is the slag steel of grade 〉=85%, and its particle diameter is 10-50mm, and it enters slag steel storehouse, and the screen underflow after the rod milling screening is the magnetic separation of grade 〉=42%, its particle diameter＜10mm, and it enters the 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, and the non-magnetic tailings of not selecting enters the tailings storehouse, the metal Ferrum content of tailings＜2% wherein, particle diameter＜10mm.
The present invention has following advantage:
(1) product is reasonable, and the added value height is conducive to later use.Five kinds of products are respectively the slag steel (particle diameter is 10-50mm) of second kind of bulk slag steel (particle diameter is 50-150mm), grade 〉=85% of first kind of bulk slag steel (particle diameter〉150mm), grade 〉=80% of grade 〉=80%, the magnetic separation of grade 〉=42% (particle diameter＜10mm) and the tailings of metal Ferrum content＜2% (particle diameter＜10mm).Wherein the slag steel of first kind and second kind of bulk slag steel and grade 〉=85% can return steel-making, and magnetic separation can be used for sintering, and tailings can be used for producing slag micro powder as cement and concrete highly active mineral admixture etc.
(2) select distinct device for use at different slags, equipment is rationally advanced.
(3) screening: this process using four roads screening.The bulk slag selects for use the hydraulic pressure diagrid of tumbling of 90 degree of can tumbling to sieve, and the screening efficiency height can effectively prevent putty, and cleaning is convenient.The slag steel that the first band magnetic machine is selected has the chute of diagrid to sieve through inside, can improve the grade of slag steel in the slag steel tank, and take full advantage of the space.Slag behind the jaw crushing crusher machine selects for use treatment capacity big, and sieve plate is that the circle of 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 for use.
(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 the bulk slag is selected magneticstrength for use, and magnetic field can be regulated.It is that two magnetic lace-tied type magnetic separators of 180/150mT carry out magnetic separation that screen overflow after second road screening is selected magneticstrength for use, and magnetic field can be regulated.Screen underflow after the screening of second road is selected top roll 140mT for use, and the two roll machine of lower roll 180mT carries out magnetic separation, and the variable ratio frequency changer speed governing.Slag after the rod mill fragmentation selects for use single roller magnetic separator of 200mT to carry out magnetic separation, and the variable ratio frequency changer speed governing.
(5) broken and purification.The fragmentation of this technology twice is purified together.The jaw crusher that has hydraulic protecting is used for the fragmentation of the first road bulk slag, can prevent from getting stuck, and crushing effect is good.The slag that magneticly elects through band magnetic machine and slag steel enter corresponding rod mill respectively and carry out fragmentation and purification.The characteristics of the special-purpose broken rod mill of slag are that grinding media is line with material and contacts in the grinding process, thereby have the certain selectivity milling action, and product granularity is more even, and mistake pulverizing ore particle is 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.About 10 mu of this technology floor space and is compared with the similar engineering of scale and product, saves to take up an area of more than 30%.
(7) Environmental Protection Level height, pollutant emission is up to standard.The cooling water circulation use of this processing unit, non-wastewater discharge.Each airborne dust point adopts microkinetic unit dust-precipitator that dust is carried out airtight capture, and the dust of capture becomes the bulk production line use that falls back.Each construction of structures is all sealed, and the production line noise is up to standard.
Description of drawings
Fig. 1 is the application's process flow sheet
Embodiment
Be that example describes this technology with certain steel mill's 400,000 tons of/year slag processing treatment production line now:
Slag after heat is vexed is stored up in the raw material factory building, can store up about 4 days, slag after the ageing is by grab crane and wheel loader material loading to the B1 hydraulic pressure diagrid (150mm * 150mm) that tumbles, screen underflow enters feed bin, the oversize material that screen overflow produces when undesired for steel-making badly bleeding or hot vexed processing, the steel-making badly bleeding be＞150mm slag steel to return the steel-making use, the bulk slag that the vexed processing of heat produces when undesired is via returning the B1 hydraulic pressure diagrid of tumbling after the hydraulic breaking hammer fragmentation.Screen underflow enters the B3 rubber conveyer via the B2 oscillating feeder under the feed bin, be transported to the B4 rubber conveyer again, B4 rubber conveyer overhung has B5 band magnetic machine, B5 band magnetic machine is selected the bulk slag steel in the slag by inside and is provided with the chute that the aperture is the 50mm diagrid, screen overflow (50mm-150mm) enters the slag steel tank, and screen underflow and magnetic separation residue slag is had bad luck to the B8 hydraulic jaw crusher by the B6 rubber conveyer and carried out fragmentation.Slag after the fragmentation (＜50mm) to be delivered to the aperture through the B9 rubber conveyer be that the B11 vibratory screening apparatus of 10mm sieves.Wherein first magnetic separating unit comprises the B5 band magnetic machine of B2 oscillating feeder, B3 rubber conveyer, B4 rubber conveyer, B4 rubber conveyer overhung and has the chute that the aperture is the 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 the B13 two roll machine through B12 rubber conveyer and B43 oscillating feeder, through magnetic separation select＜magnetic separation of 10mm enters the magnetic separation storehouse, non-magnetic tailings enters the B14 rubber conveyer, and the belt plow on the B14 rubber conveyer is discharged into the tailings storehouse with tailings.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 the B16 rubber conveyer, and B16 belt haulage drive head unit is hung with B17 band magnetic machine, and the slag steel of the 10-50mm that selects through magnetic separation enters the 2# intermediate bin, and non-magnetic slag enters the 1# intermediate bin.Slag in the 1# intermediate bin is sent into the B21 oscillating feeder by the B19 oscillating feeder through the B20 rubber conveyer, the B21 oscillating feeder is sent slag into the B22 rod mill, slag after the fragmentation of B22 rod mill is had bad luck the rubber conveyer to B24 through the B23 rubber conveyer, enter the single roller magnetic separator of B25 by the B42 oscillating feeder again and carry out magnetic separation, magnetic material enters the B16 rubber conveyer through the B26 oscillating feeder, turns back to the 3rd magnetic separating unit and continues to handle.Nonmagnetic material enters the B12 rubber conveyer, handles by second magnetic separating unit.Slag steel in the 2# intermediate bin is sent into the B30 oscillating feeder by the B28 oscillating feeder through the B29 rubber conveyer, the B30 oscillating feeder is sent the slag steel into the B31 rod mill, slag steel after the B31 rod mill is purified is delivered to the B33 vibratory screening apparatus that the aperture is 10mm through the B32 rubber conveyer, B33 vibratory screening apparatus screen overflow enters slag steel storehouse, and screen underflow is delivered to the magnetic separation storehouse through the B34 rubber conveyer by the B35 oscillating feeder.The 3rd magnetic separating unit comprises B16 rubber conveyer and B17 band magnetic machine.The 4th magnetic separating unit comprises the single 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 processing treatment technology is characterized in that it comprises the steps:
(1) slag is carried out scalping, the slag by scalping is sent to first magnetic separating unit; Be not first kind of bulk slag steel by scalping;
(2) first magnetic separating units carry out magnetic separation to the slag that passes through scalping in the step (1), the sorting mechanism that the slag steel that magneticly elects enters in first magnetic separating unit screens, be not sent to the slag steel tank by the last second kind of bulk slag steel of the sieve of sorting mechanism, be sent to broken screening unit by slag steel under the sieve of sorting mechanism; The residue slag of selecting by first magnetic separating unit is not sent to broken screening unit yet;
(3) the broken unit that screens is to carrying out fragmentation and screening less than the residue slag of selecting by first magnetic separating unit with by slag steel under the sieve of sorting mechanism in the step (2), slag under the sieve after fragmentation and the screening enters second magnetic separating unit, after the second magnetic separating unit magnetic separation, the magnetic separation of selecting enters the magnetic separation storehouse, and the non-magnetic tailings of not selecting enters the tailings storehouse; Slag on the sieve enters the 3rd magnetic separating unit and carries out magnetic separation, and the slag steel that magneticly elects enters rod milling screening unit, and the slag that does not magneticly elect enters the 4th magnetic separating unit;
Wherein, the slag steel enters rod milling screening unit and carries out the rod milling screening, and screen overflow enters slag steel storehouse, and screen underflow enters the magnetic separation storehouse; Wherein, carry out magnetic separation by the 4th magnetic separating unit, the slag that will not select is delivered to second magnetic separating unit and is handled, and the slag steel that the 4th magnetic separating unit magneticly elects turns back to the 3rd magnetic separating unit to be continued to handle.
Wherein, 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 can be regulated; Sorting mechanism in first magnetic separating unit is the chute with diagrid, and the aperture of diagrid is 50mm, and broken screening unit comprises jaw crusher and first vibratory screening apparatus, and wherein the aperture of first vibratory screening apparatus is 10mm, and the sieve plate of first vibratory screening apparatus is the abrasion resistant polyurethane material; 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 the 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 can be regulated; 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 the variable ratio frequency changer speed governing; The 4th magnetic separating unit also comprises first leg grinding machine, and slag is delivered to single roller magnetic separator again and carried out magnetic separation after carrying out fragmentation and purification by first leg grinding machine; Rod milling screening unit comprises second leg grinding machine and second vibratory screening apparatus, delivers to second vibratory screening apparatus again after the slag steel adopts second leg grinding machine to carry out fragmentation and purify and screens; Wherein the aperture of second vibratory screening apparatus is 10mm, and the sieve plate of second vibratory screening apparatus is the abrasion resistant polyurethane material; The hydraulic pressure of 90 degree of can the tumbling diagrid of tumbling is adopted in scalping, after slag carried out scalping, not by the hydraulic pressure bulk slag steel that first kind of bulk slag steel of diagrid produce when undesired for steel-making badly bleeding or hot vexed processing of tumbling, the steel-making badly bleeding is particle diameter＞150mm slag steel, returning steel-making uses, the bulk slag steel that the vexed processing of heat produces when undesired is via the diagrid of tumbling of hydraulic return after the hydraulic breaking hammer fragmentation.Grade 〉=80% of first kind of bulk slag steel by scalping not, particle diameter〉150mm; Grade 〉=80% of described second kind of bulk slag steel that first magnetic separating unit is selected, particle diameter is 50-150mm; Screen overflow after the rod milling screening is the slag steel of grade 〉=85%, and its particle diameter is 10-50mm, and it enters slag steel storehouse, and the screen underflow after the rod milling screening is the magnetic separation of grade 〉=42%, its particle diameter＜10mm, and it enters the 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, and the non-magnetic tailings of not selecting enters the tailings storehouse, the metal Ferrum content of tailings＜2% wherein, particle diameter＜10mm.
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| CN103627830A (en) * | 2013-11-29 | 2014-03-12 | 攀枝花钢城集团有限公司 | Molten iron desulphurization slag pre-processing method, slag-iron separating method and application of by-products |
| CN104004867A (en) * | 2014-05-13 | 2014-08-27 | 中冶南方工程技术有限公司 | High-efficiency economic secondary treatment process for steel slag |
| CN104293990A (en) * | 2014-10-15 | 2015-01-21 | 北海诚德镍业有限公司 | Steel slag treatment method and steel slag treatment device |
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