CN101607227A - The method and the magnetic plant of slag steel iron removal by magnetic separation - Google Patents
The method and the magnetic plant of slag steel iron removal by magnetic separation Download PDFInfo
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- CN101607227A CN101607227A CNA2008100480484A CN200810048048A CN101607227A CN 101607227 A CN101607227 A CN 101607227A CN A2008100480484 A CNA2008100480484 A CN A2008100480484A CN 200810048048 A CN200810048048 A CN 200810048048A CN 101607227 A CN101607227 A CN 101607227A
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Abstract
The invention discloses a kind of method and magnetic plant of slag steel iron removal by magnetic separation, belong to the metallurgical waste processing technology field.The method of slag steel iron removal by magnetic separation is carried out according to the following steps: (1) oven dry; (2) screening; (3) carry out ball and pound fragmentation; (4) first order magnetic separation; (5) second level magnetic separation; (6) the metalloid material screen is got steel grit and aluminium powder; (7) the tailing screening is used for different purposes.Magnetic plant: in the feed bin bottom electronic measuring scale is set, on the vibratory sluice that electronic measuring scale is provided with; The iron removal by magnetic separation device that is suspended on the vibratory sluice links to each other with frame by connection chain, and the iron removal by magnetic separation device is provided with feeding belt.Method economy of the present invention, practicality, efficient, energy-conservation; Magnetic plant is reasonable in design, and is simple in structure, easy to use, can science separate, and iron removal by magnetic separation is thorough, and the ground-slag inclusion content is few in the aluminium powder.
Description
Technical field
The invention belongs to the metallurgical waste processing technology field, be specifically related to the steel mill steel scoria magnetic separation produce a kind of low-grade, full iron TFe content 20-30%, particle diameter carries out the method for iron removal by magnetic separation again less than the slag steel of 25mm, and is used for the equipment of magnetic separation.
Background technology
In the prior art, a kind of to the method for low-grade small particle diameter slag steel iron removal by magnetic separation is to wash the ball milling iron removal by magnetic separation (as Xiang Tan, Hunan steel mill, Lianyuan, Hunan steel mill), its washing ball milling iron removal by magnetic separation technology is as follows: at first slag steel and a large amount of water are mixed together and enter ball milling in the ball mill, slurry behind the ball milling sieves, steel grit greater than 1mm in the slurry is filtered, slurry enters in the iron removal by magnetic separation groove again, carry out iron removal by magnetic separation by the permanent magnetic pulley in the groove, steel grit that the 1mm that reclaims is following and comminuted steel shot general designation aluminium powder, slurry behind the iron removal by magnetic separation enters sedimentation basin and precipitates into mud, and mud becomes mud piece (containing Free water 35-45%) behind the cloth bag press filtration.It is simple that this method has technology, convenient for production, treating capacity is big, the full iron TFe of finished product steel grit content 〉=90%, the full iron TFe of aluminium powder content 〉=52% that reclaim, all meet the metallurgical requirement (the full iron TFe of finished product steel grit content is greater than 87%, and the full iron TFe of aluminium powder content is greater than 45%) that utilizes again, full iron TFe content is below 15% in the tailing mud piece, magnetic metal iron MFe content meets the building materials instructions for use less than 1%.But this method exists the ball milling amount big, and mud is many, and tailing mud piece amount is many and contain the Free water height, is difficult to defective whole or that major part is utilized again.Another kind method is common dry magnetic separation deironing (as Taiyuan, Shanxi steel mill, Tianjin Steel Works), its iron removal by magnetic separation technology is directly to put into the ball milling ball milling after the oven dry of slag steel, carry out magnetic separation with permanent magnetic pulley and select iron when ball milling goes out mill during to the 180-200 order, can obtain the following aluminium powder (iron TFe content 〉=40% entirely) of above steel grit of 1mm (full iron TFe content 〉=90%) and 1mm.It is simple that this method has technology, convenient for production, and the finished product steel grit of recovery meets the metallurgical requirement (the full iron TFe of finished product steel grit content is greater than 87%) that utilizes again.But there is following shortcoming in this method: 1, because slag steel grit footpath difference is big, the grinding time is long, ball milling energy consumption height; 2, because bed of material became uneven during belt feeding, and steel grit aluminium powder is wrapped in the slag charge, causes the slag steel to select iron not thorough, and the aluminium powder runs off serious; When 3, adopting the permanent magnetic pulley magnetic separation to reclaim the aluminium powder, the ground-slag amount that is mingled with in the aluminium powder is too many, causes the aluminium grade powder not reach requirement.
Summary of the invention
At the above-mentioned deficiency of prior art, the technical problem to be solved in the present invention provides a kind of method and magnetic plant of slag steel iron removal by magnetic separation, its economy, and practicality, efficient, energy-conservation, consider that when reclaiming finished product steel grit, aluminium powder tailing is as construction material.
Technical scheme of the present invention is: the method for slag steel iron removal by magnetic separation is carried out according to the following steps:
(1) the slag steel is dried to containing Free water below 3% with conventional drying plant;
(2) the slag steel with oven dry sieves with conventional screening plant, sieves into above slag steel of 5mm and the following slag steel of 5mm;
(3) the slag steel more than the 5mm is carried out ball with the broken machine of huge revolving ball to it and pound fragmentation, peel adhesion is carried out ball to bulky grain on the other hand and is pounded fragmentation at the slag of steel grit on the one hand, and the slag steel that ball is pounded after the fragmentation closes with slag steel reinforced concrete below the 5mm again;
(4) will mix the slag steel and carry out first order magnetic separation, and adopt the vibration magnetic separator magnetic separation to reclaim the semimetal material;
(5) the semimetal material that reclaims is entered in the ball mill dry grind,, carry out second level magnetic separation, adopt the vibration magnetic separator magnetic separation to reclaim the metalloid material when ball milling goes out mill during to the 180-200 order;
(6) with the metalloid material that reclaims, sieve, sieve into above steel grit of 1mm and the following aluminium powder of 1mm;
(7) remaining tailings of first order magnetic separation and second level magnetic separation is sieved, sieve into four kinds of other material of level and be used for different purposes.
The slag steel to be selected magnetic strength 1200-1500GS of place during first order magnetic separation.The semimetal material to be selected magnetic strength 300-600GS of place during second level magnetic separation.The described metalloid material rate of recovery is 45-55%, the full iron TFe of metalloid material content 50-60%.After dividing, described metalloid material screen obtains above steel grit of 1mm and the following aluminium powder of 1mm, steel grit rate of recovery 40-50%, full iron TFe content 87-95%.Aluminium powder rate of recovery 50-60%, full iron TFe content 45-55%.Obtain respectively after the remaining tailings screening of described first order magnetic separation and second level magnetic separation: the tailing that 10mm is above can be used as engineering backfill and roadbed material; The tailing of 5-10mm can replace the part rubble and use as coarse aggregate; The tailing of 1-5mm can replace the part yellow ground and use as fine aggregate; The tailing of 0-1mm can be used as the composite material of producing cement.
The magnetic plant that is used for slag steel iron removal by magnetic separation, its special feature is: be provided with electronic measuring scale in feed bin bottom, electronic measuring scale is positioned on the vibratory sluice that is obliquely installed high-end, and vibrating motor is arranged on the vibratory sluice bottom; The iron removal by magnetic separation device that is suspended on the vibratory sluice links to each other with frame by connection chain, and the iron removal by magnetic separation device is provided with the belt that the magnetic separation material is sent to the vibratory sluice low side.Chute support under the vibratory sluice is provided with elastic support structure.Connection chain is connected with the top and the bilateral of frame.
Method economy of the present invention, practicality, efficient, energy-conservation, the screening tailing is as construction material when reclaiming finished product steel grit, aluminium powder; Magnetic plant of the present invention is reasonable in design, and is simple in structure, easy to use, can science separate, and iron removal by magnetic separation is thorough, and the ground-slag inclusion content is few in the aluminium powder.
Description of drawings
Accompanying drawing 1 is the plan structure schematic diagram of magnetic plant among the present invention;
Accompanying drawing 2 is the structural representations of facing of accompanying drawing 1;
Accompanying drawing 3 is process flow diagrams of the present invention.
Accompanying drawing acceptance of the bid keep the score state as follows: the 1-feed bin; The 2-electronic measuring scale; The 3-vibratory sluice; 4-chute support; The 5-vibrating motor; 6-tailing bucket; The 7-discharge bucket; The 8-belt; 9-iron removal by magnetic separation device; The 10-connection chain; The 11-frame.
The specific embodiment
Below in conjunction with embodiment the specific embodiment of the present invention and relevant technologies problem are described in further detail.
The present invention has carried out ball to the bulky grain more than the 5mm in the slag steel pounds fragmentation, has peeled off the slag that adheres on the semimetal material in the slag steel so on the one hand, pound fragmentation by the broken machine ball of huge revolving ball on the other hand after, the average grain diameter of slag steel reduces; Therefore help reducing the ball milling amount of ball mill and shortening the ball milling time.Carried out magnetic separation before the ball milling of the present invention in advance, what need enter ball milling in the ball mill only is semimetal material in the slag steel, therefore the ball milling amount of ball mill is only for washing the 30-40% of ball milling amount and common dry magnetic separation ball milling amount, so greatly saved the energy consumption of ball mill, the process throughput of slag steel is improved more than the twice.Dry ball milling amount of the present invention only is the 30-40% of washing ball milling and common dry magnetic separation ball milling amount, and the tailing of 60-70% can be directly used in building materials production after sieving.The semimetal material that ball milling comes out carries out second level magnetic separation, can remove the tailing of 40-60% in the semimetal material again, and this tailing can directly be used as cement mixture.Magnetic separation in this technology has adopted special vibration magnetic separator to carry out magnetic separation, and iron removal by magnetic separation is thorough, and the ground-slag inclusion content is few in the aluminium powder.
Embodiment 1:
1, with its oven dry, moisture content is 2.6% to get the 100kg of Jiangxi Xinyu Iron ﹠ Steel Co., Ltd. slag steel (full iron TFe content 23.5%).
2, the sieve with 5mm sieves, and is divided into above slag steel of 5mm and the following slag steel of 5mm.
3, the slag steel more than the 5mm is carried out ball with the broken machine of swinging ball and pound fragmentation, the process ball is pounded broken slag steel and the slag steel reinforced concrete below the 5mm closes.
4, the hopper of 100kg mixing slag steel being put into together the present invention's vibration magnetic separator carries out magnetic separation with the magnetic strength of 1200GS and reclaims and to obtain 33kg semimetal material, the semimetal material rate of recovery 33%, the full iron TFe of semimetal material content 43%.The full iron TFe of the tailing 67kg content 14.8% of residue 67%, magnetic metal iron MFe content 0.92% meets the building materials instructions for use.Remaining tailing sieves with the sieve of 5mm and 1mm respectively, in different building material products.
5, the 33kg semimetal material that reclaims is entered in the ball mill dry grind, when going out mill during to the 180-200 order, ball milling carries out second level magnetic separation, adopt the vibration magnetic separator magnetic separation among the present invention, semimetal material to be selected place magnetic strength is 300GS, reclaim the metalloid material, reclaim metalloid material 14.85kg altogether, the metalloid material rate of recovery 45%, the full iron TFe of metalloid material content 51%.The full iron TFe content 14.4% of the tailing (0-1mm) of residue 18.15kg, magnetic metal iron MFe content 0.91% meets the building materials instructions for use, with the composite material of residue 18.15kg tailing as production cement.
6, with the 14.85kg metalloid material that reclaims, sieve again, sieve into above steel grit of 1mm and the following aluminium powder of 1mm, steel grit reclaims 5.94kg altogether, the rate of recovery 40% (productive rate that accounts for total material is 5.94%), full iron TFe content 94%.The aluminium powder reclaims 8.91kg altogether, the rate of recovery 60% (productive rate that accounts for total material is 8.91%), full iron TFe content 53%.
Embodiment 2:
1, with its oven dry, moisture content is 2.8% to get the 100kg of Jiangxi Xinyu Iron ﹠ Steel Co., Ltd. slag steel (full iron TFe content 24.2%).
2, the sieve with 5mm sieves, and is divided into above slag steel of 5mm and the following slag steel of 5mm.
3, the slag steel more than the 5mm is carried out ball with the broken machine of swinging ball and pound fragmentation, the process ball is pounded broken slag steel and the slag steel reinforced concrete below the 5mm closes.
4, the hopper of 100kg mixing slag steel being put into together the present invention's vibration magnetic separator carries out magnetic separation recovery 35kg semimetal material, the semimetal material rate of recovery 35%, the full iron TFe of semimetal material content 41% with the magnetic strength of 1300GS.The full iron TFe of the tailing 65kg content 14.3% of residue 65%, magnetic metal iron MFe content 0.91% meets the building materials instructions for use.Remaining tailing sieves with the sieve of 5mm and 1mm respectively, in different building material products.
5, the 35kg semimetal material that reclaims is entered in the ball mill dry grind, when going out mill during to the 180-200 order, ball milling carries out second level magnetic separation, adopt the vibration magnetic separator magnetic separation among the present invention, semimetal material to be selected place magnetic strength is 400GS, reclaim the metalloid material, reclaim metalloid material 16.80kg altogether, the metalloid material rate of recovery 48%, the full iron TFe of metalloid material content 51%.The full iron TFe content 14.2% of the tailing (0-1mm) of residue 18.20kg, magnetic metal iron MFe content 0.90% meets the building materials instructions for use, with the composite material of residue 18.20kg tailing as production cement.
6, with the 16.80kg metalloid material that reclaims, sieve again, sieve into above steel grit of 1mm and the following aluminium powder of 1mm, steel grit reclaims 7.56kg altogether, the rate of recovery 45% (productive rate that accounts for total material is 7.56%), and, full iron TFe content 91%.The aluminium powder reclaims 9.24kg altogether, the rate of recovery 55% (productive rate that accounts for total material is 9.24%), full iron TFe content 51%.
Embodiment 3:
1, with its oven dry, moisture content is 2.5% to get the 100kg of Jiangxi Xinyu Iron ﹠ Steel Co., Ltd. slag steel (full iron TFe content 26.5%).
2, the sieve with 5mm sieves, and is divided into above slag steel of 5mm and the following slag steel of 5mm.
3, the slag steel more than the 5mm is carried out ball with the broken machine of swinging ball and pound fragmentation, the process ball is pounded broken slag steel and the slag steel reinforced concrete below the 5mm closes.
4,100kg mixing slag steel is put into together the hopper of the present invention's vibration magnetic separator, carried out magnetic separation with the magnetic strength of 1400GS and reclaim 37kg semimetal material, the semimetal material rate of recovery 37%, the full iron TFe of semimetal material content 39%.The full iron TFe of the tailing 63kg content 14.0% of residue 63%, magnetic metal iron MFe content 0.89% meets the building materials instructions for use.Remaining tailing sieves with the sieve of 5mm and 1mm respectively, in different building material products.
5, the 37kg semimetal material that reclaims is entered in the ball mill dry grind, when going out mill during to the 180-200 order, ball milling carries out second level magnetic separation, adopt the vibration magnetic separator magnetic separation among the present invention, semimetal material to be selected place magnetic strength is 500GS, reclaim the metalloid material, reclaim metalloid material 18.87kg altogether, the metalloid material rate of recovery 51%, the full iron TFe of metalloid material content 48%.The full iron TFe content 13.9% of the tailing (0-1mm) of residue 18.13kg, magnetic metal iron MFe content 0.88% meets the building materials instructions for use, with the composite material of residue 18.13kg tailing as production cement.
6, with the 18.87kg metalloid material that reclaims, sieve again, sieve into above steel grit of 1mm and the following aluminium powder of 1mm, steel grit reclaims 9.25kg altogether, the rate of recovery 49% (productive rate that accounts for total material is 9.25%), and, full iron TFe content 89%.The aluminium powder reclaims 9.62kg altogether, the rate of recovery 51% (productive rate that accounts for total material is 9.62%), full iron TFe content 48%.
Embodiment 4:
1, with its oven dry, moisture content is 2.9% to get the 100kg of Jiangxi Xinyu Iron ﹠ Steel Co., Ltd. slag steel (full iron TFe content 27.7%).
2, the sieve with 5mm sieves, and is divided into above slag steel of 5mm and the following slag steel of 5mm.
3, the slag steel more than the 5mm is carried out ball with the broken machine of swinging ball and pound fragmentation, the process ball is pounded broken slag steel and the slag steel reinforced concrete below the 5mm closes.
4,100kg mixing slag steel is put into together the hopper of the present invention's vibration magnetic separator, carried out magnetic separation with the magnetic strength of 1500GS and reclaim 39kg semimetal material, the semimetal material rate of recovery 39%, the full iron TFe of semimetal material content 37%.The full iron TFe of the tailing 61kg content 13.7% of residue 61%, magnetic metal iron MFe content 0.88% meets the building materials instructions for use.Remaining tailing sieves with the sieve of 5mm and 1mm respectively, in different building material products.
5, the 39kg semimetal material that reclaims is entered in the ball mill dry grind, when ball milling to 180 ~ 200 orders, go out mill and carry out second level magnetic separation, adopt the ZS type vibration magnetic separator magnetic separation among the present invention, semimetal material to be selected place magnetic strength is 600GS, reclaim the metalloid material, reclaim metalloid material 20.67kg altogether, the metalloid material rate of recovery 53%, the full iron TFe of metalloid material content 46%.The full iron TFe content 13.6% of the tailing (0-1mm) of residue 18.33kg, magnetic metal iron MFe content 0.87% meets the building materials instructions for use, with the composite material of residue 18.33kg tailing as production cement.
6, with the 20.67kg metalloid material that reclaims, sieve again, sieve into above steel grit of 1mm and the following aluminium powder of 1mm, steel grit reclaims 10.54kg altogether, the rate of recovery 51% (productive rate that accounts for total material is 10.54%), and, full iron TFe content 87%.The aluminium powder reclaims 10.13kg altogether, the rate of recovery 49% (productive rate that accounts for total material is 10.13%), full iron TFe content 46%.
Below simple vibration magnetic separator of the present invention described.In the prior art, slag steel iron removal by magnetic separation monotubular permanent magnetic pulley magnetic separator commonly used or pair roller permanent magnetic separator, by the travelling belt feed, the slag steel is by monotubular permanent magnetic pulley magnetic separator or pair roller permanent magnetic separator iron removal by magnetic separation, bed of material became uneven when there is belt feeding in this kind mode, and steel grit aluminium powder is wrapped in the slag charge, causes the slag steel to select iron not thorough, and the aluminium powder runs off serious; The ground-slag amount that is mingled with in the aluminium powder is too many, causes the aluminium grade powder not reach requirement.Vibration magnetic separator of the present invention adopts the electronic measuring scale feed, guarantee dosing, the slag steel passes through dull and stereotyped self-tipping type iron removal by magnetic separation device iron removal by magnetic separation in vibratory sluice, slag steel uniform thickness in vibratory sluice, the even speed downslide of rolling, the steel grit aluminium powder that is wrapped in the slag charge will roll to the surface, under the tramp iron separator attraction force acts, be sucked away, guarantee that slag steel iron removal by magnetic separation is thorough, the aluminium powder does not run off, the slag particle ground-slag that does not contain steel grit aluminium powder does not produce attraction upwards under tramp iron separator, be difficult for being pulled away under the self gravitation effect, thereby the ground-slag amount that is mingled with in the aluminium powder is few.Illustrate further below in conjunction with vibration magnetic separator accompanying drawing 1,2:
The slag steel falls on the electronic measuring scale 2 from feed bin 1, by entering vibratory sluice 3 upper ends after electronic measuring scale 2 meterings, the slag steel is uniform thickness under the vibration of vibratory sluice 3, the even speed downslide of rolling, roll slip over down in dull and stereotyped self-tipping type iron removal by magnetic separation device 9 iron removal by magnetic separation by vibratory sluice 3 tops, the steel grit aluminium powder of tramp iron separator 9 absorption is with belt 8 motions, exceed the magnetic force district the deadweight under self-unloading to vibratory sluice 3 lower ends, the magnetic separation material is discharged in discharge bucket 7, and tailing is discharged from tailing discharge bucket 6.Whole process is quick, easy to operate, de-ironing efficiency height, good product quality.
Claims (9)
1, a kind of method of slag steel iron removal by magnetic separation is characterized in that described method carries out according to the following steps:
(1) the slag steel is dried to containing Free water below 3% with conventional drying plant;
(2) the slag steel with oven dry sieves with conventional screening plant, sieves into above slag steel of 5mm and the following slag steel of 5mm;
(3) the slag steel more than the 5mm is carried out ball with the broken machine of huge revolving ball to it and pound fragmentation, peel adhesion is carried out ball to bulky grain on the other hand and is pounded fragmentation at the slag of steel grit on the one hand, and the slag steel that ball is pounded after the fragmentation closes with slag steel reinforced concrete below the 5mm again;
(4) will mix the slag steel and carry out first order magnetic separation, and adopt the vibration magnetic separator magnetic separation to reclaim the semimetal material;
(5) the semimetal material that reclaims is entered in the ball mill dry grind,, carry out second level magnetic separation, adopt the vibration magnetic separator magnetic separation to reclaim the metalloid material when ball milling goes out mill during to the 180-200 order;
(6) with the metalloid material that reclaims, sieve, sieve into above steel grit of 1mm and the following aluminium powder of 1mm;
(7) remaining tailings of first order magnetic separation and second level magnetic separation is sieved, sieve into four kinds of other material of level and be used for different purposes.
2, the method for slag steel iron removal by magnetic separation according to claim 1 is characterized in that: the slag steel to be selected magnetic strength 1200-1500GS of place during first order magnetic separation.
3, the method for slag steel iron removal by magnetic separation according to claim 1 is characterized in that: the semimetal material to be selected magnetic strength 300-600GS of place during the magnetic separation of the second level.
4, the method for slag steel iron removal by magnetic separation according to claim 1 is characterized in that: the described metalloid material rate of recovery is 45-55%, the full iron TFe of metalloid material content 50-60%.
5, the method for slag steel iron removal by magnetic separation according to claim 1 is characterized in that: obtain above steel grit of 1mm and the following aluminium powder of 1mm after described metalloid material screen divides, steel grit rate of recovery 40-50%, full iron TFe content 87-95%.Aluminium powder rate of recovery 50-60%, full iron TFe content 45-55%.
6, the method for slag steel iron removal by magnetic separation according to claim 1 is characterized in that: obtain respectively after the remaining tailings screening of described first order magnetic separation and second level magnetic separation: the tailing that 10mm is above can be used as engineering backfill and roadbed material; The tailing of 5-10mm can replace the part rubble and use as coarse aggregate; The tailing of 1-5mm can replace the part yellow ground and use as fine aggregate; The tailing of 0-1mm can be used as the composite material of producing cement.
7, a kind of magnetic plant that is used for slag steel iron removal by magnetic separation, it is characterized in that: be provided with electronic measuring scale (2) in feed bin (1) bottom, electronic measuring scale (2) is positioned on the vibratory sluice (3) that is obliquely installed high-end, and vibrating motor (5) is arranged on vibratory sluice (3) bottom; The iron removal by magnetic separation device (9) that is suspended on the vibratory sluice (3) links to each other with frame (11) by connection chain (10), and iron removal by magnetic separation device (9) is provided with the belt (8) that the magnetic separation material is sent to vibratory sluice (3) low side.
8, the magnetic plant that is used for slag steel iron removal by magnetic separation according to claim 7 is characterized in that: the chute support (4) under the vibratory sluice (3) is provided with elastic support structure.
9, the magnetic plant that is used for slag steel iron removal by magnetic separation according to claim 7 is characterized in that: connection chain (10) is connected with the top and the bilateral of frame (11).
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| CN102534068A (en) * | 2012-01-30 | 2012-07-04 | 山西太钢不锈钢股份有限公司 | Method for reusing common steel slag |
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| CN106622938A (en) * | 2016-11-04 | 2017-05-10 | 济南大学 | Combined separation device with vibrating screen and belt-type permanent-magnet separator |
| CN107159426A (en) * | 2017-04-27 | 2017-09-15 | 酒泉钢铁(集团)有限责任公司 | A kind of slag is secondary to select iron method |
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| CN109663799A (en) * | 2019-01-10 | 2019-04-23 | 苏州望意阳环保科技有限公司 | A kind of Technology of Steel Slag Processing for thoroughly changing wholly-owned source |
| CN113171849A (en) * | 2020-12-02 | 2021-07-27 | 吉林德帮金属材料有限公司 | Method for preparing fine iron powder by refining iron powder |
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