CN103433125A - Metallurgical slag zero-emission comprehensive utilization technology - Google Patents
Metallurgical slag zero-emission comprehensive utilization technology Download PDFInfo
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- CN103433125A CN103433125A CN2013103788375A CN201310378837A CN103433125A CN 103433125 A CN103433125 A CN 103433125A CN 2013103788375 A CN2013103788375 A CN 2013103788375A CN 201310378837 A CN201310378837 A CN 201310378837A CN 103433125 A CN103433125 A CN 103433125A
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Abstract
The invention discloses a metallurgical slag zero-emission comprehensive utilization technology. A vibrating screen, a rod mill, a magnetic-drum classificator and a magnetism machine serve as main screening devices, related devices are connected through a belt conveyor, the two-rod-milling three-magnetic-separation and four-screening mode is adopted, flow division, separation, smash and ore grinding are carried out on materials, the recovery rate of magnetic separation is improved, the content of monomer metallic iron in the materials is increased, and high-grade scrap steel in slag, high-grade magnetic separation powder and products with tailing metallic iron with the content less than 1% are obtained. According to the metallurgical slag zero-emission comprehensive utilization technology, the scrap steel in slag with the total-iron grade of more than 90% and the magnetic separation powder with total-iron grade of 60% can be obtained, and the content of tailing-grade metallic iron is smaller than 1%. The metallurgical slag zero-emission comprehensive utilization technology solves the problems that according to a common recovery technology in China, due to the facts that the total-iron grade of the scrap steel in slag is 60%, and the total-iron grade of magnetic separation powder is 40%, the recovery rate is low, and the purification effect is poor, and economic value of a recovery enterprise is improved.
Description
One, technical field
The present invention relates to a kind of technique of the slag steel for recovery, purification metallurgical slag, is the process that adopts fragmentation, screening, magnetic separation process to reclaim metallurgical slag.
Two, background technology
Can produce a large amount of metallurgical slags in steel smelting procedure, its quantity is about 15% ~ 20% of output of steel.Because the metallurgical slag complicated component is changeable, utilization rate is always not high.For a long time, metallurgical slag is considered to the waste residue produced in steelmaking process always.Treatment process and the effect of domestic big-and-middle-sized metallurgical slag treatment plant also rest on the level before 20 years, and after sorting, product does not reach the requirement of comprehensive utilization, causes the wasting of resources, environmental pollution.The recycling of metallurgical slag occupies critical role in the economic activity of recycle enterprise, and it is an important component part of Business Economic Benefit.The recycling work of carrying out metallurgical slag, for supporting industrial and agricultural production, is created the wealth of society, and excavates the goods and materials potentiality, promotes society and saves, and the protection of the environment health, prevent that social effects of pollution etc. are all significant.Metallurgical slag can be used as metallurgical raw material, construction material, production cement, agrochemical etc. widely.Therefore, the comprehensive utilization ratio of raising metallurgical slag is the responsibility of steel industry and urgent task.
Three, summary of the invention
The purpose of this invention is to provide a kind of metallurgical slag zero-emission comprehensive utilization process, be mainly used in the slag steel in recovery, purification metallurgical slag.Adopt the recovery process of fragmentation of the present invention, screening, magnetic separation, can obtain the slag steel of full iron grade more than 90% and the magnetic separation of full iron grade 60%, tailings grade metal Ferrum content is less than 1%.
Technical scheme of the present invention is: adopt vibratory sieve, rod mill, magnetic drum refiner and band magnetic machine as main screening installation, by belt conveyor join dependency equipment, determine manufacturing procedure: 1, at first material is broken for below 250mm, enter the reciprocating sieve of 40mm sieve aperture, material is divided into to bis-groups of 0 ~ 40mm and 40 ~ 250mm; 2,40mm ~ 250mm slag enters the fragmentation of 1# rod mill, and broken rear material is via the screening of 40mm reciprocating sieve, and oversize, via the sorting of band magnetic machine, obtains the slag steel of full iron grade 85%; 3, screenings 0 ~ 40mm material enters the recovery of 1# slag magnetic drum refiner, and concentrate enters 2# rod mill ore grinding, and concentrate grade is greater than 45%, and mine tailing is greater than 1mm metal abrasive grit content and is less than 1%; 4, the material after rod milling enters the purification of 2# slag magnetic drum refiner, and concentrate, via the screening of 5mm reciprocating sieve, obtains the grain steel of the full iron grade 90% of 5 ~ 40mm, the magnetic separation of the full iron grade 60% of 0 ~ 5mm.
The present invention is achieved in that
1, the reciprocating sieve of 40mm sieve aperture is divided into 0 ~ 40mm and 40 ~ 250mm to material.
2,40mm ~ 250mm slag enters the 1# rod mill, because present material be take the bulk granularity as main, the 1# rod mill be take and is broken for main, ore grinding as auxiliary, add 50 of the heat treated rod irons of process of Φ 120 in the 1# rod mill, 19 of the heat treated rod irons of the process of Φ 90, rod iron reaches 0.7 in the dutycycle in the shared space of 1# rod mill, improves engagement capacity and the breaking capacity of rod iron and material of different grain size.The time of staying of material in rod mill is controlled at 5-8 minute, can allow material fully broken and dissociate, the material of discharge is via the screening of 40mm reciprocating sieve, and oversize is via the sorting of band magnetic machine, obtain the slag steel of full iron grade 85%, screenings 0 ~ 40mm material enters 1# slag magnetic drum refiner and reclaims.
3, two kinds of 0 ~ 40mm mixing of materials enter the recovery of 1# slag magnetic drum refiner, 1# slag magnetic drum refiner adopts side concentrate mode of entrance, reduce the drop of material, reduce reaction force, 1# slag magnetic drum refiner cylinder magnetic field intensity is 3000GS, and cylinder can be along with the variation of material grade to the centrifugal force of material, carry out the speed adjustment, the adjusting range of 120-160 metre per second (m/s), can purify to full iron grade 45 ~ 50% to material, and the magnetic material productive rate is at 55-60%.
4, the material that purifies to metallic iron 45-50% enters the 2# rod mill, because raw meal particle size is less, the 2# rod mill mainly be take ore grinding as leading, be broken for auxiliary working method, add 38 of the heat treated rod irons of process of Φ 120 in rod mill, 42 of the heat treated rod irons of the process of Φ 90,22 tons of useful loads, rod iron reaches 0.88 in the dutycycle in the shared space of grinding machine, improves engagement capacity and the breaking capacity of rod iron and material of different grain size.The time of staying of material in rod mill is controlled at 10-15 minute, makes material fully broken and dissociate, and the material of discharge is via the sorting of 2# slag magnetic drum refiner.
5,2# slag magnetic drum refiner adopts side concentrate mode of entrance, reduce the drop of material, reduce reaction force, the magnetic field intensity of the cylinder of 2# slag magnetic drum refiner is 3500GS, cylinder can be along with the variation of material grade to the centrifugal force of material, carry out the speed adjustment, the adjusting range of 120-160 metre per second (m/s).Magnetic material concentrate after sorting, via the screening of 5mm reciprocating sieve, obtains the grain steel of the full iron grade 90% of 5 ~ 40mm, the magnetic separation of the full iron grade 60% of 0 ~ 5mm.
6, purify: the technique position of rod mill, the fine fodder that must be controlled at slag magnetic drum refiner carries out ore grinding, according to the iron content requirement, to the diameter of the dielectric rod in rod mill select, proportioning is selected, the time of staying of material in equipment, treating capacity etc. need technology controlling and process; Slag magnetic drum refiner is to grinding rear finished product sorting, and magnetic field, feed height, rotary speed, the sub-material position of refiner needed to technology controlling and process.
The inventive method can obtain slag steel and full iron grade 60% magnetic separation of full iron grade more than 90%, and tailings grade metal Ferrum content is less than 1%.This technique has solved the domestic full iron grade 60% of recovery process slag steel commonly used, and this rate of recovery of magnetic separation and the poor problem of refining effect of full iron grade 40% have improved the economic worth of returned enterprise.
Four, accompanying drawing explanation
Fig. 1 is process equipment layout viewing of the present invention.
Five, the specific embodiment
The implementation step of metallurgical slag zero-emission comprehensive utilization process method is:
1) material loading
Slag, by the forklift blow tank 1 of packing into, has the diagrid 2 that can fascinate on blow tank 1, diagrid 2 sieve apertures that can fascinate are 250mmx250mm.The bulk slag that is greater than 250mm slips in a side manger 3, and after fragmentation, the material that is less than 250mm directly enters the 1# ribbon conveyer 4 of processing line, can't be crushed to 250mm following be bulk slag steel, metal Ferrum content is greater than 90%.1# ribbon conveyer 4 arranges manual selection station, by the workman, selects the wherein visible metal of bulk and other valuable materials.
2) rod milling
The slag oscillating feeder under blow tank that is less than 250mm enters 1# ribbon conveyer 4, then enters 1# vibratory sieve 5.1# vibratory sieve 5 sieve aperture 30mm, oversize enters 1# rod mill 7 through 2# ribbon conveyer 6 and carries out rod milling.
3) once sieve magnetic separation
Slag, after 1# rod mill 7 grinds, enters 3# ribbon conveyer 8 by batcher, then enters 2# vibratory sieve 9.2# vibratory sieve 9 sieve aperture 30mm, oversize enters 4# ribbon conveyer 10, and band magnetic machine 11 is arranged on 4# ribbon conveyer 10, selects the bulk slag steel of 30 ~ 250mm, and iron content is greater than 85%.Tailings enters the manger of a side, by forklift, delivers to the diagrid 2 that can fascinate, and enters rod mill through the belt conveyer and continues rod milling.
4) secondary magnetic separation
The screenings of 2# vibratory sieve 9 enters 5# ribbon conveyer 12, with the screenings of 1# vibratory sieve 5, together enters 6# ribbon conveyer 13.6# ribbon conveyer 13 heads have 1# slag magnetic drum refiner 14, the magnetic material magneticly elected enters 7# ribbon conveyer 15, and non-magnetic material enters 8# ribbon conveyer 16, through 8# ribbon conveyer 16, stores up to the tailings stockyard, tailings granularity≤30mm, metal Ferrum content≤1%.
5) secondary rod milling
Magnetic material enters the surge bunker buffer memory by 9# ribbon conveyer 17.Under surge bunker, batcher is arranged, evenly be given to 2# rod mill 19 through 10# ribbon conveyer 18 and carry out rod milling.
6) three magnetic separation screening
The complete material of rod milling is transported to 12# ribbon conveyer 21 via 11# ribbon conveyer 20, and 12# ribbon conveyer 21 heads have 2# slag magnetic drum refiner 22.The magnetic material that 2# slag magnetic drum refiner 22 is selected enters 3# vibratory sieve 23.3# vibratory sieve 23 sieve apertures are 5mm, and oversize is the grain steel, and granularity is 5 ~ 30mm, and metal Ferrum content >=90% is delivered to stockyard via 13# conveyer 24.Screenings is generally the fine powder of metal Ferrum content >=60%, and granularity 0 ~ 5mm delivers to stockyard via 14# conveyer defeated 25, can return sintering.
The non-magnetic material that 2# slag magnetic drum refiner 22 is selected enters 8# ribbon conveyer 16, stores up to the tailings stockyard.
Claims (5)
1. a metallurgical slag zero-emission comprehensive utilization process, it is characterized in that: adopt vibratory sieve, rod mill, magnetic drum refiner and band magnetic machine as main screening installation, by belt conveyor join dependency equipment, determine manufacturing procedure: 1, at first material is broken for below 250mm, enter the reciprocating sieve of 40mm sieve aperture, material is divided into to bis-groups of 0 ~ 40mm and 40 ~ 250mm; 2,40mm ~ 250mm slag enters the fragmentation of 1# rod mill, and broken rear material is via the screening of 40mm reciprocating sieve, and oversize, via the sorting of band magnetic machine, obtains the slag steel of full iron grade 85%; 3, screenings 0 ~ 40mm material enters the recovery of 1# slag magnetic drum refiner, and concentrate enters 2# rod mill ore grinding, and concentrate grade is greater than 45%, and mine tailing is greater than 1mm metal abrasive grit content and is less than 1%; 4, the material after rod milling enters the purification of 2# slag magnetic drum refiner, and concentrate, via the screening of 5mm reciprocating sieve, obtains the grain steel of the full iron grade 90% of 5 ~ 40mm, the magnetic separation of the full iron grade 60% of 0 ~ 5mm.
2. metallurgical slag zero-emission comprehensive utilization process according to claim 1, it is characterized in that: the 1# rod mill be take and is broken for main, ore grinding as auxiliary, add 50 of the heat treated rod irons of process of Φ 120 in the 1# rod mill, 19 of the heat treated rod irons of the process of Φ 90, the dutycycle in rod iron shared space in the 1# rod mill reaches 0.7; The time of staying of material in the 1# rod mill is controlled at 5-8 minute, makes material fully broken and dissociate.
3. metallurgical slag zero-emission comprehensive utilization process according to claim 1, it is characterized in that: 1# slag magnetic drum refiner adopts side concentrate mode of entrance, the cylinder magnetic field intensity of 1# slag magnetic drum refiner is 3000GS, cylinder can be along with the variation of material grade to the centrifugal force of material, carry out the speed adjustment, the adjusting range of 120-160 metre per second (m/s), can purify to full iron grade 45 ~ 50% to material, and the magnetic material productive rate is at 55-60%.
4. metallurgical slag zero-emission comprehensive utilization process according to claim 1, it is characterized in that: the 2# rod mill take ore grinding as main, be broken for auxiliary, add 38 of the heat treated rod irons of process of Φ 120 in rod mill, 42 of the heat treated rod irons of the process of Φ 90,22 tons of useful loads, rod iron reaches 0.88 in the dutycycle in the shared space of 2# rod mill, and the time of staying of material in the 2# rod mill is controlled at 10-15 minute, makes material fully broken and dissociate.
5. metallurgical slag zero-emission comprehensive utilization process according to claim 1, it is characterized in that: 2# slag magnetic drum refiner adopts side concentrate mode of entrance, the magnetic field intensity of the cylinder of 2# slag magnetic drum refiner is 3500GS, cylinder can be along with the variation of material grade to the centrifugal force of material, carry out the speed adjustment, the adjusting range of 120-160 metre per second (m/s), magnetic material concentrate after sorting sieves via the 5mm reciprocating sieve, obtain the grain steel of the full iron grade 90% of 5 ~ 40mm, the magnetic separation of the full iron grade 60% of 0 ~ 5mm.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110180640A (en) * | 2019-06-10 | 2019-08-30 | 成渝钒钛科技有限公司 | A kind of storehouse abrasion process method in mitigation rod mill load and rod mill |
| CN111450973A (en) * | 2020-04-14 | 2020-07-28 | 国宏联绿(北京)科技发展有限公司 | Preparation method of active micro-powder containing roller method steel slag and directly-discharged fly ash |
| CN111450972A (en) * | 2020-04-14 | 2020-07-28 | 国宏联绿(北京)科技发展有限公司 | Ultrafine sand prepared from steel slag by drum method and method |
| CN112304801A (en) * | 2020-10-30 | 2021-02-02 | 攀枝花钢城集团有限公司 | Method for measuring content of metallic iron in high-grade slag steel iron |
| CN112657627A (en) * | 2020-12-29 | 2021-04-16 | 中融恒远科贸有限公司 | Zero-emission comprehensive utilization method for metallurgical slag |
| CN113941436A (en) * | 2021-10-15 | 2022-01-18 | 四川德胜集团钒钛有限公司 | Magnetic slag powder treatment method and treatment device |
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| WO2006041281A2 (en) * | 2004-09-03 | 2006-04-20 | Recco B.V. | Method and device for recovering stainless steel from steel slags under dry conditions |
| CN101736099A (en) * | 2009-12-09 | 2010-06-16 | 北京首钢国际工程技术有限公司 | Secondary treatment system for steel slag and method thereof |
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| US4404022A (en) * | 1981-11-10 | 1983-09-13 | Noranda Mines Limited | Dore slag treatment |
| WO2002066164A1 (en) * | 2001-02-19 | 2002-08-29 | Georg Schons | Facility and method for treating muck containing metal |
| WO2006041281A2 (en) * | 2004-09-03 | 2006-04-20 | Recco B.V. | Method and device for recovering stainless steel from steel slags under dry conditions |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110180640A (en) * | 2019-06-10 | 2019-08-30 | 成渝钒钛科技有限公司 | A kind of storehouse abrasion process method in mitigation rod mill load and rod mill |
| CN111450973A (en) * | 2020-04-14 | 2020-07-28 | 国宏联绿(北京)科技发展有限公司 | Preparation method of active micro-powder containing roller method steel slag and directly-discharged fly ash |
| CN111450972A (en) * | 2020-04-14 | 2020-07-28 | 国宏联绿(北京)科技发展有限公司 | Ultrafine sand prepared from steel slag by drum method and method |
| CN111450972B (en) * | 2020-04-14 | 2021-12-28 | 国宏联绿(北京)科技发展有限公司 | Ultrafine sand prepared from steel slag by drum method and method |
| CN111450973B (en) * | 2020-04-14 | 2021-12-28 | 国宏联绿(北京)科技发展有限公司 | Preparation method of active micro-powder containing roller method steel slag and directly-discharged fly ash |
| CN112304801A (en) * | 2020-10-30 | 2021-02-02 | 攀枝花钢城集团有限公司 | Method for measuring content of metallic iron in high-grade slag steel iron |
| CN112304801B (en) * | 2020-10-30 | 2022-07-01 | 攀枝花钢城集团有限公司 | Method for measuring content of metallic iron in high-grade slag steel iron |
| CN112657627A (en) * | 2020-12-29 | 2021-04-16 | 中融恒远科贸有限公司 | Zero-emission comprehensive utilization method for metallurgical slag |
| CN113941436A (en) * | 2021-10-15 | 2022-01-18 | 四川德胜集团钒钛有限公司 | Magnetic slag powder treatment method and treatment device |
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