CN105039612A - Method for recycling metallic iron from stainless steel slag - Google Patents
Method for recycling metallic iron from stainless steel slag Download PDFInfo
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- CN105039612A CN105039612A CN201510372916.4A CN201510372916A CN105039612A CN 105039612 A CN105039612 A CN 105039612A CN 201510372916 A CN201510372916 A CN 201510372916A CN 105039612 A CN105039612 A CN 105039612A
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- stainless steel
- steel slag
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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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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- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a method for recycling metallic iron from stainless steel slag. The method comprises the following steps of performing cooling treatment by spraying water to the stainless steel slag; screening the stainless steel slag through a first griller; screening the screen underflow of the first griller through a second griller, smashing the oversize products of the second griller and then returning to the second griller for screening, and enabling the screen underflow of the second griller to enter a primary wet ball mill for smashing; screening the stainless steel slag from the primary wet ball mill through a third griller, smashing the oversize products of the third griller by placing into a secondary wet ball mill, then placing the discharging material of the secondary wet ball mill and the screen underflow of the third griller on a table to perform gravitational segregation, and collecting metallic iron particles at the concentrate end of the table; concentrating overflow slag slurry at the tailings side of the table, and pressing the concentrated slurry into a mud cake. According to the method provided by the invention, chunks of steel slag are no need to be sorted manually, so that the working efficiency is high, and moreover, the treated steel slag can be comprehensively utilized, so that resources are not wasted and environment pollution cannot happen.
Description
Technical field
The present invention relates to the technical field of comprehensive utilization of resources, particularly a kind of method of Footwall drift iron from stainless steel slag.
Background technology
Stainless steel slag can be divided into electric furnace stainless steel slag, converter stainless steel slag and AOD stainless steel slag etc.Current stainless steel slag major part is converter stainless steel slag and AOD stainless steel slag, in stainless steel slag often containing have an appointment 5% ~ 15% residual steel, iron resources is horn of plenty comparatively, from stainless steel slag, Footwall drift iron can not only reduce the generation of waste residue and the potential hazard to environment, bring good environmental benefit and social benefit, the more important thing is energy Footwall drift resource thus bring huge economic benefit, to alleviate the degree of resource scarcity, making enterprise walk the road of Sustainable development.Electric furnace stainless steel slag profile is generally in block, granular and powdery.AOD stainless steel slag and the rear easily efflorescence of converter stainless steel slag cooling, mainly in powdery.The process of stainless steel slag is a difficult problem for metallurgy industry and stainless steel factory, is mainly manifested in: dust is large, difficult; Containing Cr in slag
6+toxic compounds; Ni system scraps steel not easily reclaims; Tailings comprehensive utilization acquires a certain degree of difficulty.Domestic small-sized stainless steel plant adopts converter and AOD to produce 200 or 300 series stainless steels mostly, and this stainless steel slag powder is many, and the metallic particles in slag is little, and does not have magnetic.At present, the domestic stainless steel slag of China adopts manual sorting's bulk slag steel mostly, tailings discards the backward treatment process of storing up, and not only wastes resource, and causes environmental pollution.
Summary of the invention
The object of the invention is a kind of method providing Footwall drift iron from stainless steel slag, to solve, existing stainless steel slag adopts manual sorting's bulk slag steel mostly, tailings discards the backward treatment process of storing up, not only waste resource, and cause the technical matters of environmental pollution.
The object of the invention is realized by following technical scheme:
A method for Footwall drift iron from stainless steel slag, comprises the following steps:
A. cooling process is carried out to oven-fresh stainless steel slag water spray;
B. cooled stainless steel slag is sieved by grid I;
C. sieved by grid II by the screen underflow of grid I, the screen overflow of grid II is placed in pulverizer and pulverizes, return described grid II afterwards again and sieve, the screen underflow of described grid II enters one-level wet-type ball mill and pulverizes;
D. sieved from described one-level wet-type ball mill stainless steel slag out by grid III, the screen overflow of described grid III is placed in secondary wet-type ball mill pulverize, afterwards the discharging of described secondary wet-type ball mill is placed on shaking table and carries out gravitational segregation, the screen underflow of described grid III is also placed on described shaking table and carries out gravitational segregation, collects iron granule at the concentrate end of described shaking table;
E. concentrated in concentration basin by the overflow slag of the mine tailing side of described shaking table slurry and carry out precipitating, concentrating, the mud after concentrated is pressed into mud cake by pressure filter.
Preferably, described grid I is grid of tumbling, described in the tumble grid gap of grid be 100mm.
Preferably, the grid gap of described grid II is 20mm ~ 40mm.
Preferably, the grid gap of described grid III is 2mm ~ 3mm.
Preferably, the described pulverizer in step c is the shovel loader of band pick.
Preferably, step e is also included in concentration basin the step adding coagulant aids.
Preferably, described coagulant aids is PAM.
Preferably, reductive agent is added in the ingress of described one-level wet-type ball mill and described secondary wet-type ball mill.
Preferably, described reductive agent is ferrous sulfate.
Preferably, step e be also included in concentration basin add chemical reagent with in and the step of alkaline waste water in concentration basin.
Compared with prior art, the present invention has following beneficial effect:
1, the method for Footwall drift iron from stainless steel slag of the present invention does not need manual sorting's bulk slag steel, and working efficiency is high, and slag after treatment can fully utilize, and can not cause waste resource, also can not cause environmental pollution;
2, the feature that method is many for stainless steel slag powder, metallic particles is thin of Footwall drift iron from stainless steel slag of the present invention, arranges the technique that wet ball grinding adds shaking table, and flow process is simple, and environmental protection is stable, and reduced investment.
Accompanying drawing explanation
Fig. 1 is the process flow sheet of the method for Footwall drift iron from stainless steel slag of the present invention.
Embodiment
Below in conjunction with accompanying drawing, illustrate the present invention.In order to enable those skilled in the art to clear, complete knowing content of the present invention and technical scheme of the present invention can be implemented, in embodiment, disclose a large amount of details.But, obviously, do not have these details those skilled in the art can implement technical scheme of the present invention yet, reach object of the present invention, realize effect of the present invention.These details are the embodiments of the optimum that contriver selects through a large amount of experiments, are not used for limiting the scope of the invention.Protection scope of the present invention is as the criterion with the content of claims, and those skilled in the art's technical scheme that content obtains without the need to creative work disclosed in present specification is also in protection scope of the present invention.
Refer to Fig. 1, the invention provides a kind of method of Footwall drift iron from stainless steel slag, comprise the following steps:
A. carry out cooling process to oven-fresh stainless steel slag water spray, this treatment step generally carries out in steelworks region, and the water sprayed can be normal-temperature water.
B. cooled stainless steel slag is sieved by grid of tumbling, the grid gap of described grid of tumbling is 100mm, tumble grid screen underflow in be less than 3mm powder tailings account for 95%, all the other are the tailing particles being greater than 3mm and being less than 100mm, afterwards the screen underflow of grid of tumbling are transported to Treatment stations by wagon tremie and process.
C. in Treatment stations, the screen underflow of grid of tumbling is sieved by grid II, the grid gap of described grid II is 20mm ~ 40mm, the shovel loader screen overflow of grid II being placed in band pick is pulverized, return described grid II afterwards again to sieve, the screen underflow of described grid II enters one-level wet-type ball mill and pulverizes.
D. sieved from described one-level wet-type ball mill stainless steel slag out by grid III, the grid gap of described grid III is 2mm ~ 3mm, the screen overflow of described grid III is placed in secondary wet-type ball mill pulverize, afterwards the discharging of described secondary wet-type ball mill is placed on shaking table and carries out gravitational segregation, the screen underflow of described grid III is also placed on described shaking table and carries out gravitational segregation, collects iron granule at the concentrate end of described shaking table.Wherein, widely used a kind of size separation equipment when shaking table is graded shot material.Separation by shaking table realizes under the acting in conjunction of bed surface and lateral current.Wash-down water in clean water basin is paved with the bed surface of transverse inclination, and forms uniform inclined-plane sheet flow.Slag slurry is by pipeline self on bed surface, and slag particle is loose, the layering by current flushing and bed surface oscillating action in riffling groove.The light slag particle in upper strata is subject to larger impulse force, mostly moves downward along bed surface transverse inclination, discharges, be called mine tailing.Correspondingly this side of bed surface is called mine tailing side.And be positioned at the heavy slag particle (metallic particles) bottom bed by the differential motion of bed surface and longitudinally move, discharged by driving end opposite and be called concentrate, the position of corresponding bed surface is called concentrate end.Concentrate end fall≤2mm iron granule by belt collect enter hopper stack, then transported by truck.
E. concentrated in concentration basin by the overflow slag of the mine tailing side of described shaking table slurry and carry out precipitating, concentrating, the mud after concentrated is pressed into mud cake by pressure filter.Be specially, the overflow slag of the mine tailing side of described shaking table slurry flows automatically to water collecting basin through ditch, after be sent to concentration basin precipitation through mortar pump.In order to strengthen the sedimentation effect of waste water, PAM coagulant aids can be added in concentration basin.In the stabilizing feed well of concentration basin, be provided with stirrer, be beneficial to waste water and mix further with coagulant aids.Waste water enters concentration basin and stops after about 1.5 hours, and supernatant liquor overflow is to clean water basin, and the water in clean water basin can be back to one-level wet-type ball mill, secondary wet-type ball mill and shaking table etc. and use water spot recycle.Whole production process supplements a small amount of service water (every t slag about supplements 0.1t ~ 0.5t water), non-wastewater discharge.Solid matter in overflow slag slurry is sink to enrichment region and concentrates, and the mud after concentrated is pumped to Filter Press through pressure filter to ore deposit.The feed ore concentration of pressure filter is about 40%.Vacuum tightness when the supporting vacuum pump of pressure filter keeps pressure filter work is 60 ~ 80KPa, filtrate is introduced into automatic draining device and carries out gas-water separation, isolated liquid enters filtrate catch pit, gas enters vacuum pump and carries gas and water separator gas-water separation again, liquid enters filtrate catch pit, and gas enters air.The filtrate produced in vacuum filtration process returns concentration basin and continues to recycle.The dehydrated sludge cake that pressure filter is pressed into is sent into tailings stockyard by belt and is stacked, and is then transported by truck.Dehydrated sludge cake water ratio is less than 20%.Dehydrated sludge cake can be used as the building materials such as cement.
Wherein, the waste water in concentration basin is in alkalescence, and pH value about 11 ~ 12, can add chemical agent (example hydrochloric acid, dilute sulphuric acid etc.) and neutralize.According to the Cr in slag slurry
6+content or concentration, add the stronger reductive agents such as ferrous sulfate in the ingress of described one-level wet-type ball mill and described secondary wet-type ball mill and carry out detoxification, make Cr in the tailings after separation
6+content <0.5mg/l, reaches national environmental standard, all can be used as the building materials such as cement, reaches Non-toxic recycling.
Be only several specific embodiments of the application above, but the application is not limited thereto, the changes that any person skilled in the art can think of, all should drops in the protection domain of the application.
Claims (10)
1. the method for Footwall drift iron from stainless steel slag, is characterized in that, comprise the following steps:
A. cooling process is carried out to oven-fresh stainless steel slag water spray;
B. cooled stainless steel slag is sieved by grid I;
C. sieved by grid II by the screen underflow of grid I, the screen overflow of grid II is placed in pulverizer and pulverizes, return described grid II afterwards again and sieve, the screen underflow of described grid II enters one-level wet-type ball mill and pulverizes;
D. sieved from described one-level wet-type ball mill stainless steel slag out by grid III, the screen overflow of described grid III is placed in secondary wet-type ball mill pulverize, afterwards the discharging of described secondary wet-type ball mill is placed on shaking table and carries out gravitational segregation, the screen underflow of described grid III is also placed on described shaking table and carries out gravitational segregation, collects iron granule at the concentrate end of described shaking table;
E. concentrated in concentration basin by the overflow slag of the mine tailing side of described shaking table slurry and carry out precipitating, concentrating, the mud after concentrated is pressed into mud cake by pressure filter.
2. the method for Footwall drift iron from stainless steel slag as claimed in claim 1, it is characterized in that, described grid I is grid of tumbling, described in the tumble grid gap of grid be 100mm.
3. the method for Footwall drift iron from stainless steel slag as claimed in claim 1, it is characterized in that, the grid gap of described grid II is 20mm ~ 40mm.
4. the method for Footwall drift iron from stainless steel slag as claimed in claim 1, it is characterized in that, the grid gap of described grid III is 2mm ~ 3mm.
5. the method for Footwall drift iron from stainless steel slag as claimed in claim 1, is characterized in that, the described pulverizer in step c is the shovel loader of band pick.
6. the method for Footwall drift iron from stainless steel slag as claimed in claim 1, it is characterized in that, step e is also included in concentration basin the step adding coagulant aids.
7. the method for Footwall drift iron from stainless steel slag as claimed in claim 6, it is characterized in that, described coagulant aids is PAM.
8. the method for Footwall drift iron from stainless steel slag as claimed in claim 1, is characterized in that, add reductive agent in the ingress of described one-level wet-type ball mill and described secondary wet-type ball mill.
9. the method for Footwall drift iron from stainless steel slag as claimed in claim 8, it is characterized in that, described reductive agent is ferrous sulfate.
10. the method for Footwall drift iron from stainless steel slag as claimed in claim 1, is characterized in that, step e be also included in concentration basin add chemical reagent with in and the step of alkaline waste water in concentration basin.
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| CN201510372916.4A CN105039612B (en) | 2015-06-29 | 2015-06-29 | A kind of method that metallic iron is reclaimed from stainless steel slag |
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| CN201510372916.4A CN105039612B (en) | 2015-06-29 | 2015-06-29 | A kind of method that metallic iron is reclaimed from stainless steel slag |
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| CN105039612A true CN105039612A (en) | 2015-11-11 |
| CN105039612B CN105039612B (en) | 2017-09-15 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114589189A (en) * | 2022-03-15 | 2022-06-07 | 云南曲靖钢铁集团凤凰钢铁有限公司 | Process for improving Italy Tenuon furnace metal purity degree |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5427607A (en) * | 1994-11-07 | 1995-06-27 | Her Majesty The Queen In Right Of Canada As Represented By The Minister Of Energy, Mines And Resources | Process for the recovery of metallic iron from slags and other residues |
| JPH10101382A (en) * | 1996-09-30 | 1998-04-21 | Kawasaki Steel Corp | Effectively utilizing method of slag |
| CN101596488A (en) * | 2009-04-25 | 2009-12-09 | 张英君 | A kind of stainless steel slag jigging iron separation technique |
| CN102836778A (en) * | 2011-06-23 | 2012-12-26 | 庞兵 | Wet type treatment process for stainless steel slag |
| CN103100546A (en) * | 2011-11-09 | 2013-05-15 | 昌三机电科技(苏州)有限公司 | Stainless steel slag dry and wet combination treatment process |
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2015
- 2015-06-29 CN CN201510372916.4A patent/CN105039612B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5427607A (en) * | 1994-11-07 | 1995-06-27 | Her Majesty The Queen In Right Of Canada As Represented By The Minister Of Energy, Mines And Resources | Process for the recovery of metallic iron from slags and other residues |
| JPH10101382A (en) * | 1996-09-30 | 1998-04-21 | Kawasaki Steel Corp | Effectively utilizing method of slag |
| CN101596488A (en) * | 2009-04-25 | 2009-12-09 | 张英君 | A kind of stainless steel slag jigging iron separation technique |
| CN102836778A (en) * | 2011-06-23 | 2012-12-26 | 庞兵 | Wet type treatment process for stainless steel slag |
| CN103100546A (en) * | 2011-11-09 | 2013-05-15 | 昌三机电科技(苏州)有限公司 | Stainless steel slag dry and wet combination treatment process |
Non-Patent Citations (1)
| Title |
|---|
| 戴少生 等: "《粉碎工程及设备》", 30 November 1994, 中国建筑工业出版社 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114589189A (en) * | 2022-03-15 | 2022-06-07 | 云南曲靖钢铁集团凤凰钢铁有限公司 | Process for improving Italy Tenuon furnace metal purity degree |
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