CN105714003A - Method for recovering iron in steel slag and using tailing thereof - Google Patents
Method for recovering iron in steel slag and using tailing thereof Download PDFInfo
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- CN105714003A CN105714003A CN201610230534.2A CN201610230534A CN105714003A CN 105714003 A CN105714003 A CN 105714003A CN 201610230534 A CN201610230534 A CN 201610230534A CN 105714003 A CN105714003 A CN 105714003A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B3/00—General features in the manufacture of pig-iron
- C21B3/04—Recovery of by-products, e.g. slag
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/248—Binding; Briquetting ; Granulating of metal scrap or alloys
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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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Abstract
The invention discloses a method for recovering iron in steel slag and using tailing thereof. The method is characterized by comprising the flows of: 1) drying of the steel slag; 2) ball milling of the steel slag; 3) classification and magnetic separation; 4) returning of crude slag to ball milling; and 5) magnetic separation of the tailing as a sintering flux. The method, provided by the invention, uses the methods of ball milling, classification and magnetic separation for recovering the iron in the steel slag, and uses the magnetically separated tailing as the sintering flux for further recovering non-selected iron and other useful metal elements in the magnetically separated tailing, so that 100% recovery of the iron in the steel slag is realized, the sintering cost is reduced, and the comprehensive recycling of the steel slag resource is realized.
Description
Technical field
The present invention relates to slag comprehensive utilization process field, specifically a kind of reclaim ferrum in slag and the method utilizing its tailings.
Background technology
Slag be in steel manufacture process by slag making materials, smelt reactant, corrode the body of heater that comes off and impurity that fettling material, metal charge are brought into and the solid slag body that the slag making materials that is intentionally added for adjusting slag character forms, be the side-product producing iron and steel process.Aborning, often produce 1t iron and steel, just have the slag of 15%～20% to produce.In China, the slag total amount that whole nation steel mill is piled up takes up an area more than 10,000 mu more than 400,000,000 t, and still increases with the quantity of more than 9,000 ten thousand t every year.If these slags do not comprehensively utilize, increasing soil, contaminated environment can be taken, cause the waste of resource.
Containing the metallic iron of 10%～15% in slag, classification magnetic separation technology reclaims metallic iron technology in slag and is increasingly widely applied in recent years, and becomes the major way of slag recovery ferrum.After magnetic separation, the stove that directly returns containing ferromagnetic particle of big particle diameter continues steel-making, and little granule is then applied to the smelting of ferrum.But the ferrum possibly together with about 7% is not selected in the remaining tailings of magnetic separation.
And, in prior art few about the research on utilization of tailings remaining after steel scoria magnetic separation, tailings is mainly composed of the basic anhydride such as CaO, MgO, and containing beneficial metallic elements such as Fe, Mn, Mg, V, Ti, when used as staflux, it is possible not only to reduce the use of resource of limestone, dolomite, fluorite, reduces sintering cost, and the beneficial metallic elements such as Fe and Mn, Mg, V, Ti of not magneticly electing in steel can be recycled.But these resource significant portions have all suffered waste.
How to realize 100% of ferrum in slag to reclaim, become problem demanding prompt solution with the open pit mining of slag.
Summary of the invention
Present invention aim to address in prior art, the problem such as in slag the response rate of ferrum is not high, tailings after magnetic separation is not fully utilized.
Employed technical scheme comprise that for realizing the object of the invention such, a kind of reclaim ferrum in slag and the method utilizing its tailings, it is characterised in that comprise the following steps:
1) ball milling
Being placed in ball mill by the slag after drying, the rotating speed of described ball mill is 240～360r/min, and Ball-milling Time is 20～25min；
2) screening
By step 1) in slag after the ball milling that obtains sieve, be divided into>40mm, 10～40mm, 5～10mm, 1～5mm,<the slag of five grades of 1mm；
3) magnetic separation
The slag of five grades is carried out magnetic separation, is separately recovered the slag of each grade iron content and the tailings of each grade；
4) thick slag returns ball milling
By step 3) in the particle diameter that the obtains tailings more than 5mm, return step 2)～4)；Until obtaining particle diameter less than 5mm and non-magnetic tailings；
5) tailings utilizes
5.1) by step 4) in the tailings that obtains and Iron Ore Powder, staflux, coke powder mix, obtain sinter mixture；
The weight ratio of described tailings, Iron Ore Powder, staflux and coke powder is 2～5 81.9～85.3 7.8～10.1 5；
5.2) by step 5.1) in the sinter mixture that obtains load in batch mixer and granulate, described mixed process is added the water accounting for sinter mixture weight 7.5 ± 0.5%；
5.3) by step 5.2) in compound after the granulation that obtains send in sintering machine and be sintered, obtain sintering deposit；
5.4) by step 5.3) in the sintering deposit that obtains carry out crushing and sieving, after screening, the particle diameter sintering deposit less than 5mm is as step 5.1) in Iron Ore Powder repeat step 5.1)～5.4)；The particle diameter sintering deposit more than 5mm is finished product sintering deposit.
Further, described step 1) in ball mill in add and the slag steel ball with weight, the diameter of described steel ball is 10～40mm.
Further, described step 2) in screening process undertaken by vibrosieve.
Further, described step 3) in magnetic separation process use electric magnet, magnetic induction is 200Gbs.
Further, described step 5.1) in staflux include limestone, quick lime and dolomite.
Further, described step 5.2) in Granulation time be 3～5min.
Further, described step 5.3) in sintering process in, the thickness range of sinter bed is 540～800mm, firing temperature ranges for 1100～1200 DEG C, ranging for 1～2min the duration of ignition, igniting range of negative pressure is 6～8kPa, and sintering range of negative pressure is 10～12kPa.
The solution have the advantages that mathematical, use method in the present invention to be possible not only to realize 100% of ferrum in slag and reclaim, it is also possible to make non-magnetic tailings carry out open pit mining.Open pit mining process is possible not only to reduce the use of the resource of limestone, dolomite, fluorite, reduce sintering cost, the beneficial metallic elements such as Fe and Mn, Mg, V, Ti of not magneticly electing in steel can also be recycled, it is achieved that the comprehensive reutilization of steel slag resource.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of the present invention.
Detailed description of the invention
Below in conjunction with embodiment, the invention will be further described, but should not be construed the above-mentioned subject area of the present invention and be only limitted to following embodiment.Without departing from the idea case in the present invention described above, according to ordinary skill knowledge and customary means, make various replacement and change, all should include in protection scope of the present invention.
Embodiment 1:
The present embodiment selects the slag of certain enterprise's STEELMAKING PRODUCTION, a kind of reclaims the method for ferrum in slag, it is characterised in that comprise the following steps:
1) ball milling
Being placed in ball mill by the slag after drying, the rotating speed of described ball mill is 240r/min, and Ball-milling Time is 25min；In described mechanical milling process, addition and the slag steel ball with weight in ball mill, the diameter of described steel ball is 25mm.
2) screening
By step 1) in slag after the ball milling that obtains sieve, be divided into>40mm, 10～40mm, 5～10mm, 1～5mm,<the slag of five grades of 1mm；Described screening process is undertaken by vibrosieve.
3) magnetic separation
The slag of five grades is carried out magnetic separation, is separately recovered the slag of each grade iron content and the tailings of each grade；Described magnetic separation process uses electric magnet, and magnetic induction is 200Gbs.
4) thick slag returns ball milling
By step 3) in the particle diameter that the obtains tailings more than 5mm, return step 2)～4)；Until obtaining particle diameter less than 5mm and non-magnetic tailings.
Embodiment 2:
The secondary that the non-magnetic tailings obtained in embodiment 1 carries out resource utilizes.Described step is as follows:
5.1) by step 4) in the tailings that obtains and Iron Ore Powder, staflux, coke powder mix, obtain sinter mixture；Sintering burden process keeps sintering basicity (R=CaO/SiO2) it is 2.0.
Described Iron Ore Powder includes India ore powder, Australia powder, returns mine, Iron concentrate and low Iron Ore Powder five kinds, and described staflux includes limestone, quick lime and dolomite.
Described tailings and Iron Ore Powder, staflux, coke powder dispensing (degree/%) as shown in table 1.
Table 1
After testing, raw materials for sintering chemical composition is as shown in table 2.
Table 2
| The name of an article | TFe | SiO2 | CaO | MgO | Al2O3 | H2O | Scaling loss |
| India ore powder | 56.35 | 7.08 | 0.64 | 0.22 | 6.28 | 8.36 | 6.65 |
| Australia powder | 60.43 | 3.73 | 0.24 | 0.11 | 2.50 | 9.56 | 5.22 |
| Return mine | 55.13 | 5.24 | 10.18 | 1.39 | 2.11 | 0.38 | 4.42 |
| Iron concentrate | 64.05 | 6.41 | 0.86 | 0.42 | 2.33 | 10.30 | 0.80 |
| Low Iron Ore Powder | 52.05 | 10.79 | 3.17 | 0.64 | 1.78 | 9.94 | 8.19 |
| Quick lime | 0.71 | 3.04 | 84.35 | 2.24 | 0.68 | 0.20 | 5.07 |
| Limestone | 0.22 | 0.98 | 53.5 | 1.27 | 0.21 | 3.6 | 43 |
| Dolomite | 0.34 | 0.76 | 26.46 | 21.3 | 0.11 | 0.0 | 46.53 |
| Tailings | 7.60 | 14.27 | 43.84 | 7.43 | 13.09 | 2.84 | 3.56 |
| Coke powder | 0.70 | 7.50 | 8.01 | 0.17 | 0.68 | 7.54 | 80.13 |
Note: the scaling loss in table 2 refers to that Iron Ore Powder is 800～1000 DEG C of parts that can burn, including water of crystallization, CO2Deng.
5.2) by step 5.1) in the sinter mixture that obtains load in batch mixer and granulate, described mixed process is added the water accounting for sinter mixture weight 7.5 ± 0.5%；Granulation time is 5min.
5.3) by step 5.2) in compound after the granulation that obtains send in sintering machine and be sintered, obtain sintering deposit；The thickness range of sinter bed is 540～800mm, and firing temperature ranges for 1200 DEG C, ranges for 1～2min the duration of ignition, and igniting range of negative pressure is 6～8kPa, and sintering range of negative pressure is 10～12kPa.
5.4) by step 5.3) in the sintering deposit that obtains carry out crushing and sieving, after screening, the particle diameter sintering deposit less than 5mm is as step 5.1) in Iron Ore Powder repeat step 5.1)～5.4)；The particle diameter sintering deposit more than 5mm is finished product sintering deposit.
After testing, finished product sintering performance index is as shown in table 3.
Table 3
Note: drum strength is the important indicator evaluating sintering deposit shock resistance and anti-wear performance, drop strength is used for representing the impact resistance of sintering deposit.
After testing, finished product Sinter Component is as shown in table 4
Table 4
| Scheme | TFe | Basicity R | CaO | SiO2 | MgO | Al2O3 |
| Embodiment 2 | 55.87 | 2.0 | 10.03 | 5.02 | 1.77 | 2.04 |
Embodiment 3:
The secondary that the non-magnetic tailings obtained in embodiment 1 carries out resource utilizes.Described step is as follows:
5.1) by step 4) in the tailings that obtains and Iron Ore Powder, staflux, coke powder mix, obtain sinter mixture；Sintering burden process keeps sintering basicity (R=CaO/SiO2) it is 2.0.
Described Iron Ore Powder includes India ore powder, Australia powder, returns mine, Iron concentrate and low Iron Ore Powder five kinds, and described staflux includes limestone, quick lime and dolomite.
Described tailings and Iron Ore Powder, staflux, coke powder dispensing (degree/%) as shown in table 5.
Table 5
After testing, raw materials for sintering chemical composition is as shown in table 2.
5.2) by step 5.1) in the sinter mixture that obtains load in batch mixer and granulate, described mixed process is added the water accounting for sinter mixture weight 7.5 ± 0.5%；Granulation time is 5min.
5.3) by step 5.2) in compound after the granulation that obtains send in sintering machine and be sintered, obtain sintering deposit；The thickness range of sinter bed is 540～800mm, and firing temperature ranges for 1200 DEG C, ranges for 1～2min the duration of ignition, and igniting range of negative pressure is 6～8kPa, and sintering range of negative pressure is 10～12kPa.
5.4) by step 5.3) in the sintering deposit that obtains carry out crushing and sieving, after screening, the particle diameter sintering deposit less than 5mm is as step 5.1) in Iron Ore Powder repeat step 5.1)～5.4)；The particle diameter sintering deposit more than 5mm is finished product sintering deposit.
After testing, finished product sintering performance index is as shown in table 6.
Table 6
Note: drum strength is the important indicator evaluating sintering deposit shock resistance and anti-wear performance, drop strength is used for representing the impact resistance of sintering deposit.
After testing, finished product Sinter Component is as shown in table 7
Table 7
| Scheme | TFe | Basicity R | CaO | SiO2 | MgO | Al2O3 |
| Embodiment 3 | 54.85 | 1.98 | 10.53 | 5.29 | 1.97 | 2.32 |
Embodiment 4:
The secondary that the non-magnetic tailings obtained in embodiment 1 carries out resource utilizes.Described step is as follows:
5.1) by step 4) in the tailings that obtains and Iron Ore Powder, staflux, coke powder mix, obtain sinter mixture；Sintering burden process keeps sintering basicity (R=CaO/SiO2) it is 2.0.
Described Iron Ore Powder includes India ore powder, Australia powder, returns mine, Iron concentrate and low Iron Ore Powder five kinds, and described staflux includes limestone, quick lime and dolomite.
Described tailings and Iron Ore Powder, staflux, coke powder dispensing (degree/%) as shown in table 8.
Table 8
After testing, raw materials for sintering chemical composition is as shown in table 2.
5.2) by step 5.1) in the sinter mixture that obtains load in batch mixer and granulate, described mixed process is added the water accounting for sinter mixture weight 7.5 ± 0.5%；Granulation time is 5min.
5.3) by step 5.2) in compound after the granulation that obtains send in sintering machine and be sintered, obtain sintering deposit；The thickness range of sinter bed is 540～800mm, and firing temperature ranges for 1200 DEG C, ranges for 1～2min the duration of ignition, and igniting range of negative pressure is 6～8kPa, and sintering range of negative pressure is 10～12kPa.
5.4) by step 5.3) in the sintering deposit that obtains carry out crushing and sieving, after screening, the particle diameter sintering deposit less than 5mm is as step 5.1) in Iron Ore Powder repeat step 5.1)～5.4)；The particle diameter sintering deposit more than 5mm is finished product sintering deposit.
After testing, finished product sintering performance index is as shown in table 9.
Table 9
Note: drum strength is the important indicator evaluating sintering deposit shock resistance and anti-wear performance, drop strength is used for representing the impact resistance of sintering deposit.
After testing, finished product Sinter Component is as shown in table 10
Table 10
| Scheme | TFe | Basicity R | CaO | SiO2 | MgO | Al2O3 |
| Embodiment 4 | 53.54 | 1.99 | 11.05 | 5.57 | 2.52 | 2.74 |
Conclusion: from table 1,5 and 8, raw materials for sintering adds the tailings of 2.5%, 5% respectively, the addition of staflux (limestone, quick lime, dolomite) reduces to 10.8%, 9.1% from 12.2% respectively, decreases 1.4%, 3.1% respectively.
Therefore use magnetic separation tailings as staflux, advantageously reduce the consumption of limestone, quick lime, dolomite equal solvent, reduce sintering cost.
By table 3,6 and 9 it can be seen that along with the increase of tailings addition in raw materials for sintering, drop strength is increased to 83.25%, 85.46% by 81.82%；Tumbler index is increased to 64.35%, 67.13% by 61.27%；Anti-wear index is reduced to 4.15%, 3.76% by 4.55%.
So after adding magnetic separation tailings in raw materials for sintering, not only will not reduce the quality of sintering deposit, the quality of production of sintering deposit increases on the contrary.Therefore, use magnetic separation tailings technically feasible as staflux.
Claims (7)
1. one kind is reclaimed ferrum in slag and the method utilizing its tailings, it is characterised in that comprise the following steps:
1) ball milling
Being placed in ball mill by the slag after drying, the rotating speed of described ball mill is 240～360r/min, and Ball-milling Time is 20～25min；
2) screening
By step 1) in slag after the ball milling that obtains sieve, be divided into>40mm, 10～40mm, 5～10mm, 1～5mm,<the slag of five grades of 1mm；
3) magnetic separation
The slag of five grades is carried out magnetic separation, is separately recovered the slag of each grade iron content and the tailings of each grade；
4) thick slag returns ball milling
By step 3) in the particle diameter that the obtains tailings more than 5mm, return step 2)～4)；Until obtaining particle diameter less than 5mm and non-magnetic tailings；
5) tailings utilizes
5.1) by step 4) in the tailings that obtains and Iron Ore Powder, staflux, coke powder mix, obtain sinter mixture；
The weight ratio of described tailings, Iron Ore Powder, staflux and coke powder is 2～5 81.9～85.3 7.8～10.1 5；
5.2) by step 5.1) in the sinter mixture that obtains load in batch mixer and granulate, described mixed process is added the water accounting for sinter mixture weight 7.5 ± 0.5%；
5.3) by step 5.2) in compound after the granulation that obtains send in sintering machine and be sintered, obtain sintering deposit；
5.4) by step 5.3) in the sintering deposit that obtains carry out crushing and sieving, after screening, the particle diameter sintering deposit less than 5mm is as step 5.1) in Iron Ore Powder repeat step 5.1)～5.4)；The particle diameter sintering deposit more than 5mm is finished product sintering deposit.
2. according to claim 1 a kind of reclaim ferrum in slag and the method utilizing its tailings, it is characterised in that: described step 1) in ball mill in add and the slag steel ball with weight, the diameter of described steel ball is 10～40mm.
3. according to claim 1 a kind of reclaim ferrum in slag and the method utilizing its tailings, it is characterised in that: described step 2) in screening process undertaken by vibrosieve.
4. according to claim 1 a kind of reclaim ferrum in slag and the method utilizing its tailings, it is characterised in that: described step 3) in magnetic separation process use electric magnet, magnetic induction is 200Gbs.
5. according to claim 1 a kind of reclaim ferrum in slag and the method utilizing its tailings, it is characterised in that: described step 5.1) in staflux include limestone, quick lime and dolomite.
6. according to claim 1 a kind of reclaim ferrum in slag and the method utilizing its tailings, it is characterised in that: described step 5.2) in Granulation time be 3～5min.
7. according to claim 1 a kind of reclaim ferrum in slag and the method utilizing its tailings, it is characterized in that: described step 5.3) in sintering process in, the thickness range of sinter bed is 540～800mm, firing temperature ranges for 1100～1200 DEG C, the duration of ignition ranges for 1～2min, igniting range of negative pressure is 6～8kPa, and sintering range of negative pressure is 10～12kPa.
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| CN109811095A (en) * | 2019-03-01 | 2019-05-28 | 西安交通大学 | A kind of heat accumulating type stainless steel slag waste-heat recovery device and method |
| CN110106348A (en) * | 2019-05-21 | 2019-08-09 | 中南大学 | A kind of compound additive and its application method for strengthening lateritic nickel ore sintering |
| CN113930613A (en) * | 2021-10-13 | 2022-01-14 | 四川德胜集团钒钛有限公司 | Method for improving steel slag proportion in uniformly mixed ore |
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Application publication date: 20160629 |