CN103981304A - Regeneration method for molten iron desulphurization slag - Google Patents
Regeneration method for molten iron desulphurization slag Download PDFInfo
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- CN103981304A CN103981304A CN201410237326.6A CN201410237326A CN103981304A CN 103981304 A CN103981304 A CN 103981304A CN 201410237326 A CN201410237326 A CN 201410237326A CN 103981304 A CN103981304 A CN 103981304A
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- 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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- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The invention discloses a regeneration method for molten iron desulphurization slag. The regeneration method comprises the following steps of naturally cooling molten iron desulphurization slag generated by a steel and iron plant, breaking the molten iron desulphurization slag by using a heavy hammer, and then, carrying out ball-milling treatment, wherein a hard calcium sulfide shell on the surfaces of lime particles is broken in the ball-milling process; after ball-milling treatment is ended, sieving by using a 100-250-mesh sieve, deironing oversize products, then, returning the oversize products to carry out secondary levigation, enabling fine screen underflow particles to enter a dry magnetic separator to carry out magnetic separation at the magnetic field strength of 100-150kA/m, returning and sintering the obtained an iron-contained substance or steelmaking and recycling; adding 10-30% of lime into magnetic separation tailings, pressing a spherical desulfurizer on a dry ball pressing machine after uniformly mixing, and returning to a metallurgy process for secondary desulphurization. The regeneration method is capable of recycling a great number of unreacted lime particles in the molten iron desulphurization slag, simple in operation, economic, practical and particularly suitable for treating molten iron desulphurization slag in which lime powder is sprayed and blown.
Description
Technical field
The invention belongs to metallurgical technology field, be specifically related to a kind of regeneration treating method of desulfurizing slag of hot metal.
Background technology
In order to obtain high-quality steel, molten iron need to remove sulphur wherein before entering steel melting furnace smelting, is called molten iron pre-desulfurization, the main winding-up lime desulfurization technique that adopts at present, and consumption lime, produces desulfurizing slag of hot metal.The ultimate principle of lime particle desulfurization of jetting in molten iron is: the sulphur in iron liquid is diffused into lime particle surface and desulphurization reaction occurs generates sulfurated lime, high-melting-point sulfurated lime covers lime particle surface and forms fine and close duricrust, seriously hinder the further reaction of lime particle, caused the reactivity of lime sharply to decline; In order to improve desulfurizing iron effect, in production, have to increase doctor solution consumption or reduce lime particle granularity, can cause again spray gun for desulfuration to stop up seriously but reduce lime granularity.Therefore, adopt in the desulfurizing slag of hot metal that lime base desulfurizer produces, unreacted lime is the valuable constituent of its tool potential quality, if can regeneration can reduce the consumption of first resource.
As everyone knows, lime calcining process can be discharged great amount of carbon dioxide greenhouse gas, and therefore reducing lime consumption, improving lime utilising efficiency is also to control the Important Action of greenhouse gas emission.In view of the reaction characteristics of Desulfurization by injecting method, although desulfurizing slag of hot metal contains certain sulphur, but still there is certain sulfur capacity, and contain a large amount of metal iron shots and unreacted lime particle, therefore there is important recycling and be worth.But desulfurizing slag of hot metal belongs to reducing slag, be exposed in air efflorescence serious, in transport, stacking and storage process, can cause serious dust and environmental pollution.At present, desulfurizing slag of hot metal is carried out to comprehensive utilization technique both at home and abroad fairly simple, mainly comprise the following aspects.
Chinese patent application CN101298079A discloses a kind of method of desulfurizing slag of hot metal environmental protection treatment, and molten iron slag carries out fragmentation after adopting the depositing dust of fetching water, and then sieves sorting; On sieve, bulk slag enters autogenous mill, screening, magnetic separation after mill.The part that magnetic separation iron content is greater than 5cm reclaims as raw materials for metallurgy, is less than 5cm part and carries out wet ball-milling, magnetic separation, and slag iron separates, and in iron product, sulphur content is reduced to 0.5%, and the rich iron of magnetic separation is as raw materials for sintering utilization.
Chinese patent CN10149178B discloses a kind of a kind of desulphurizing slag powder treatment method and desulfurization slag recycling method that is conducive to SINTERING PRODUCTION that improves desulphurizing slag powder grade, be specially desulfurization slag is carried out to fragmentation, the slag iron of bulk is selected in magnetic separation, remaining is desulphurizing slag powder, to after desulphurizing slag powder ball milling, carry out magnetic separation, the high iron charge of gained is allocated sintered material into.After above-mentioned processing, the high iron charge of gained is allocated sintering again into, is conducive to SINTERING PRODUCTION, and the desulfurization slag that is particularly suitable for vanadium titano-magnetite is processed time application.
Chinese patent application CN103433141A discloses a kind of steel mill desulfurization slag sorting process method, it is 22 ~ 27% slurries that the desulfurization slag intermediate that to be specially the 10-16 object composition that obtains by screening mode be carbon and collecting agent and pore forming material are mixed to form concentration, make slurries form the bubble that diameter is 8 ~ 10mm by the mode of flotation, after the bubble that collection diameter is 8-10mm, obtain desulfurization slag isolate, improved the comprehensive utilization of desulfurization slag.
Chinese patent application CN102268514A discloses a kind of KR desulfurization slag iron recoverying and utilizing method, is specially the bulk slag iron of KR desulfurization generation through stacking, and bits separate with iron part, loose shape slag iron is stacked cooling; Slag iron is joined in the iron bag of normal turnover, iron bag carries out KR desulfurization processing after connecing molten iron, and the molten iron that KR handles normally fills iron steel-making.This method makes full use of blast-melted self heat and KR stirs fusing slag iron by force, has both all reclaimed ferrous components in slag, avoids again the pollution of high sulphur slag to steel-making molten steel composition in slag iron.Aforesaid method has all been obtained good effect aspect metallic iron in recovery desulfurization slag.
Prior art is all around how effectively to improve the rate of recovery of iron in desulfurization slag, and ignored other valuable constituent in slag or the recycling of mineral, as CaO, SiO in unreacted lime particle, slag
2and Al
2o
3deng, thus be necessary to develop one more effectively, recoverying and utilizing method thoroughly.
Summary of the invention
The object of this invention is to provide a kind of regeneration treating method of desulfurizing slag of hot metal, realized the recycling of desulfurizing slag of hot metal resource.
To achieve the above object of the invention, the technical solution used in the present invention is: a kind of regeneration treating method of desulfurizing slag of hot metal, comprises the following steps:
(1) desulfurizing slag of hot metal cooling after through broken, ball milling, after 100～250 eye mesh screens, obtain screen overflow and screen underflow;
(2) above-mentioned screen underflow is carried out to magnetic separation separation and obtain iron compound and magnetic separation tailings;
(3) by above-mentioned magnetic separation tailings with addition of lime, after mixing, carry out pressure ball, obtain recycling desulfurizer; The mass ratio of described magnetic separation tailings and lime is 100: (10～30).
In technique scheme, in step (2), utilize dry-type magnetic extractor to carry out magnetic separation separation to screen underflow; Magneticstrength when magnetic separation is 100～150kA/m.
In technique scheme, in step (3), adopt dry type ball press to carry out pressure ball.The size of product can be according to requirements, selects pressing process parameter to control.
In technique scheme, desulfurizing slag of hot metal naturally cooling, then through broken, ball milling, in mechanical milling process, lime particle surface sulfide calcium duricrust is broken, fresh lime particle exposes again; Then the mesh screen that sieves divides, and screen underflow fine particle enters dry-type magnetic extractor magnetic separation and separates, and screen overflow can return and carry out secondary ball milling, screening after deironing, is fully used.Magnetic separation tailings after magnetic separation separates mixes with lime, after stirring, on dry type ball press, is pressed into recycling desulfurizer.
In the present invention, desulfurizing slag of hot metal obtains iron compound and recycling desulfurizer after treatment; Iron compound can return to sintering or steelmaking process is recycled, as sintering aid or steel-making additive, to improve the utilization ratio of iron and steel flow process iron.Recycling desulfurizer can return to metallurgical process for desulfurizing iron.
Utilize method disclosed by the invention can reduce greatly the production cost of enterprise: in industrial production, to comprise three kinds, lime base, passivated magnesium base, carbide of calcium base for the pulvis of desulfurizing iron.To produce the Steel Complex of 5,000,000 tons per year as example, the agent of market purchasing lime desulfurization is for desulfurizing iron, and theoretical consumption is 8kg/t molten iron, and annual sorbent consumption amount is 40,000 tons.At present, the market value of lime base desulfurizer is 1200 yuan/ton, and enterprise needs to need every year to drop into 4,800 ten thousand yuan.
Suppose that desulfurization slag generation is 10kg/ ton molten iron, in desulfurization slag, contain 20% unreacted lime, the method according to this invention can all be recycled, produce the iron and steel enterprise of 5,000,000 tons per year, it is 10,000 tons that year recovery unreacted lime is made recycling desulfurizer, lime desulfurization agent price is 1200 yuan/ton, and enterprise every year can cost saving 1,200 ten thousand yuan.
Because technique scheme is used, the present invention compared with prior art has following advantages:
(1) the invention discloses a kind for the treatment of process of new desulfurizing slag of hot metal, reclaiming in desulfurization slag in metallic iron, also effectively having utilized unreacted lime particle in desulfurization slag, is a kind of desulfurizing slag of hot metal recycling novel method, has realized the maximization of the desulfurization slag utilization of resources.
(2) in whole treating processes disclosed by the invention, be waterless operation, avoided the aquation of unreacted lime in desulfurizing slag of hot metal; Pollution-free, farthest utilize the valuable constituent in desulfurizing slag of hot metal; The recycling desulfurizer excellent performance making, during for desulfurizing iron, desulfurization degree is high, can reach more than 77%.
(3) method disclosed by the invention is simply controlled, easy handling, and the treatment time is short, is applicable to suitability for industrialized production; And high to desulfurizing slag of hot metal regeneration rate, remarkable in economical benefits.
Embodiment
Below in conjunction with embodiment, the invention will be further described:
Embodiment 1:
By desulfurizing slag of hot metal by routing up in special slag ladle, uniform spreading launches and naturally cooling, desulfurization slag is carried out to weight fragmentation, then ball milling on oscillatory type ball mill, the raw material obtaining after ball milling is crossed to 150 eye mesh screens, coarse grain slag returns after deironing that to carry out secondary levigate, particulate slag enters dry-type magnetic extractor and carries out the separation of slag iron, magneticstrength is 100kA/m, metallic iron returns to sintering, ironmaking or steelmaking process and uses, lime with addition of magnetic separation tailings quality 20% again in magnetic separation tailings, adopts dry type ball press to be pressed into recycling desulfurizer after mixing.By above-mentioned processing parameter, the rate of recovery of whole treatment scheme iron is 87.54%.On 100kg induction furnace, carrying out desulfurizing iron test shows: in the time that the initial sulphur content of molten iron is 0.050%, adding regenerative sulfur binding dosage is 8.0kg/t, and after processing, molten steel sulfur content is reduced to 0.019%, and desulfurization degree is 60.22%.
Embodiment 2:
By desulfurizing slag of hot metal by routing up in special slag ladle, uniform spreading launches and naturally cooling, desulfurization slag is carried out to weight fragmentation, then ball milling on oscillatory type ball mill, the raw material obtaining after ball milling is crossed to 200 eye mesh screens, coarse grain slag returns after deironing that to carry out secondary levigate, particulate slag enters dry-type magnetic extractor and carries out the separation of slag iron, magneticstrength is 150kA/m, metallic iron returns to sintering, ironmaking or steelmaking process and uses, lime with addition of 30% again in magnetic separation tailings, adopts dry type ball press to be pressed into recycling desulfurizer after mixing.By above-mentioned processing parameter, the rate of recovery of whole treatment scheme iron is 92.33%.On 100kg induction furnace, carrying out desulfurizing iron test shows: in the time that the initial sulphur content of molten iron is 0.063%, adding regenerative sulfur binding dosage is 10.0kg/t, and after processing, molten steel sulfur content is reduced to 0.014%, and desulfurization degree is 77.47%.
Claims (4)
1. a regeneration treating method for desulfurizing slag of hot metal, is characterized in that, comprises the following steps:
(1) desulfurizing slag of hot metal cooling after through broken, ball milling, after 100～250 eye mesh screens, obtain screen overflow and screen underflow;
(2) above-mentioned screen underflow is carried out to magnetic separation separation and obtain iron compound and magnetic separation tailings;
(3) by above-mentioned magnetic separation tailings with addition of lime, after mixing, carry out pressure ball, obtain recycling desulfurizer; The mass ratio of described magnetic separation tailings and lime is 100: (10～30).
2. the regeneration treating method of desulfurizing slag of hot metal according to claim 1, is characterized in that: in step (2), utilize dry-type magnetic extractor to carry out magnetic separation separation to screen underflow.
3. the regeneration treating method of desulfurizing slag of hot metal according to claim 2, is characterized in that: in step (2), magneticstrength when magnetic separation is 100～150kA/m.
4. the regeneration treating method of desulfurizing slag of hot metal according to claim 1, is characterized in that: in step (3), adopt dry type ball press to carry out pressure ball.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410237326.6A CN103981304A (en) | 2014-05-30 | 2014-05-30 | Regeneration method for molten iron desulphurization slag |
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| CN201410237326.6A CN103981304A (en) | 2014-05-30 | 2014-05-30 | Regeneration method for molten iron desulphurization slag |
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| CN201410237326.6A Pending CN103981304A (en) | 2014-05-30 | 2014-05-30 | Regeneration method for molten iron desulphurization slag |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104907171A (en) * | 2015-06-09 | 2015-09-16 | 安徽工业大学 | Method for recycling crystalline flake graphite from molten iron desulphurization residues |
| CN110340103A (en) * | 2018-04-04 | 2019-10-18 | 中冶宝钢技术服务有限公司 | A kind of pressure ball production technology and production line |
| CN111270047A (en) * | 2020-02-21 | 2020-06-12 | 江苏沙钢集团有限公司 | Method for comprehensively treating KR desulfurization slag |
| CN113373275A (en) * | 2021-05-07 | 2021-09-10 | 武汉科技大学 | Internal recycling method for KR desulfurization slag steel plant |
| CN115254319A (en) * | 2022-06-23 | 2022-11-01 | 山东钢铁股份有限公司 | Device and method for separating primary large-scale graphite from molten iron pretreatment desulphurization slag |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4009024A (en) * | 1975-09-26 | 1977-02-22 | Koppers Company, Inc. | Process for regeneration and reuse of steelmaking slag |
| CN1436250A (en) * | 2000-06-14 | 2003-08-13 | 日本钢管株式会社 | Method and apparatus for producing desulfurizing agent for hot-metal |
| CN101161828A (en) * | 2007-11-28 | 2008-04-16 | 孙中强 | Magnesium desulphurization method for molten iron pretreatment and powder used thereby |
| CN101298079A (en) * | 2008-04-28 | 2008-11-05 | 莱芜钢铁集团泰东实业有限公司 | Environmental protection process method of desulfurizing slag of hot metal |
| CN102296140A (en) * | 2011-08-09 | 2011-12-28 | 武汉钢铁(集团)公司 | Method of producing cast iron for auto parts with desulfuration residues |
| CN102634625A (en) * | 2012-05-07 | 2012-08-15 | 武汉冶金渣环保工程有限责任公司 | Method for producing ductile cast iron by utilizing desulfurized slags |
-
2014
- 2014-05-30 CN CN201410237326.6A patent/CN103981304A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4009024A (en) * | 1975-09-26 | 1977-02-22 | Koppers Company, Inc. | Process for regeneration and reuse of steelmaking slag |
| CN1436250A (en) * | 2000-06-14 | 2003-08-13 | 日本钢管株式会社 | Method and apparatus for producing desulfurizing agent for hot-metal |
| CN101161828A (en) * | 2007-11-28 | 2008-04-16 | 孙中强 | Magnesium desulphurization method for molten iron pretreatment and powder used thereby |
| CN101298079A (en) * | 2008-04-28 | 2008-11-05 | 莱芜钢铁集团泰东实业有限公司 | Environmental protection process method of desulfurizing slag of hot metal |
| CN102296140A (en) * | 2011-08-09 | 2011-12-28 | 武汉钢铁(集团)公司 | Method of producing cast iron for auto parts with desulfuration residues |
| CN102634625A (en) * | 2012-05-07 | 2012-08-15 | 武汉冶金渣环保工程有限责任公司 | Method for producing ductile cast iron by utilizing desulfurized slags |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104907171A (en) * | 2015-06-09 | 2015-09-16 | 安徽工业大学 | Method for recycling crystalline flake graphite from molten iron desulphurization residues |
| CN104907171B (en) * | 2015-06-09 | 2017-01-25 | 安徽工业大学 | Method for recycling crystalline flake graphite from molten iron desulphurization residues |
| CN110340103A (en) * | 2018-04-04 | 2019-10-18 | 中冶宝钢技术服务有限公司 | A kind of pressure ball production technology and production line |
| CN111270047A (en) * | 2020-02-21 | 2020-06-12 | 江苏沙钢集团有限公司 | Method for comprehensively treating KR desulfurization slag |
| CN113373275A (en) * | 2021-05-07 | 2021-09-10 | 武汉科技大学 | Internal recycling method for KR desulfurization slag steel plant |
| CN115254319A (en) * | 2022-06-23 | 2022-11-01 | 山东钢铁股份有限公司 | Device and method for separating primary large-scale graphite from molten iron pretreatment desulphurization slag |
| CN115254319B (en) * | 2022-06-23 | 2023-12-05 | 山东钢铁股份有限公司 | Device and method for separating primary large-scale graphite from molten iron pretreatment desulfurization slag |
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Application publication date: 20140813 |