CN104152607A - Method for pulverizing converter steel slag in hot-stuffy mode - Google Patents
Method for pulverizing converter steel slag in hot-stuffy mode Download PDFInfo
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- CN104152607A CN104152607A CN201410436125.9A CN201410436125A CN104152607A CN 104152607 A CN104152607 A CN 104152607A CN 201410436125 A CN201410436125 A CN 201410436125A CN 104152607 A CN104152607 A CN 104152607A
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- slag
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- steel slag
- efflorescence
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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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Abstract
The invention belongs to the technical field of metallurgy, and particularly relates to a method for pulverizing converter steel slag in a hot-stuffy mode. Oven-fresh steel slag and extra-large pieces of converter steel slag generated after the initial hot stuffy process intersect with each other to be tiled in a slag pit to be thrashed in the hot-stuffy mode. Existing heat of the oven-fresh steel slag is used for circularly performing the hot stuffy operation, after heat expansion and cold shrinkage, blocky materials are pulverized, the breaking process is omitted, and further separation of slag and iron can be improved. Waste steel is recycled, and meanwhile pretreatment consumption of the converter steel slag can be reduced.
Description
Technical field
The invention belongs to metallurgical technology field, be specifically related to the method for the vexed efflorescence bessemer furnace slag of a kind of heat.
Background technology
Slag processing adopts traditional hot application treatment process, compare and have many defects, as lack sealing, vapour pressure and can not control etc., but hot application technique has that place is large, the stewing time of heat controls the features such as flexible with current advanced person's the vexed treatment process of online heat.Current, slag efflorescence weak effect, the subject matter that produces a large amount of superhard block steel slags has: 1. fetch water time and the amount of fetching water are inadequate.Slag is fetched water, and system water setting-out amount is little, dead band is many, it is inhomogeneous to fetch water, the time of fetching water was limited in 15 minutes, the amount of fetching water of each steel slag tank only has 6 tons of left and right, cause the severity of quench of warm sludge inadequate, water vapor generation is few, free calcium oxide in slag (f-CaO) and free magnesium (f-MgO) are cleared up insufficient, and slag efflorescence effect is naturally very poor.2. long processing period, all coolingly surpasses 10 days; 3. slag, iron inferior separating effect, metal recovery rate is low; The workload of ④Jiang road, fragmentation, screening, magnetic separation is large, and equipment loss is serious.Therefore, the stewing technique of change slag heat is imperative.
Summary of the invention
Problem to be solved by this invention is to provide the method for the vexed efflorescence bessemer furnace slag of a kind of heat, the method not only can be by the direct efflorescence of oven-fresh liquid steel slag to being less than 200mm, and can, by super large piece slag (lumpiness is more than the 200mm) efflorescence of the vexed rear generation of initial heat to being less than 200mm, finally make the content of slag more than lumpiness 200mm in 3%.
The method comprises the following steps:
A, in pit bottom, spread into oven-fresh liquid steel slag, thickness is not less than 500mm; Repave into need to again processing the slag of efflorescence, thickness is below 500mm; Fetch water;
B, repeating step a, until fill up pit;
C, have steam to occur, the heat that continues to fetch water is vexed; Do not have steam to occur, direct heat is vexed.
Concrete, in aforesaid method step a, described oven-fresh liquid steel slag temperature is 500～1000 ℃.
Concrete, in aforesaid method step a, it is 500～2000mm that described thickness is not less than 500mm.
Concrete, in aforesaid method step a, described thickness 500mm is 100～500mm below.
Concrete, in aforesaid method step a, described fetching water do not occur that ponding is as the criterion.
Concrete, in aforesaid method step c, described fetching water as fetching water to till not there is not steam.
Concrete, in aforesaid method, the whole operating time is not less than 24h.
Preferably, in aforesaid method, the whole operating time is 1～10d.
Preferably, in aforesaid method step a, the slag of the lumpiness that the described slag that need to again process efflorescence is generation after initial heat is vexed more than 200mm.Be preferably 200～400mm.This slag, because lumpiness is larger, can not meet next step need of production, so also need to continue efflorescence.
The inventive method is vexed by two kinds of overlapping intersections mixing of slag being carried out to heat, not only can the oven-fresh slag of efflorescence, bulk slag after can also efflorescence initial heat is vexed, thereby make slag (lumpiness the is less than 200mm) ratio that can directly carry out next step production be greater than 97%, the ratio of the above slag of lumpiness 200mm is less than 3%.Break through traditional treatment process and need to carry out all difficult difficult problems that lumpiness is reduced of efflorescence several times, thereby saved time, human and material resources.
Embodiment
A method for the vexed efflorescence bessemer furnace slag of heat, comprises the following steps:
A, in pit bottom, spread into oven-fresh liquid steel slag, thickness is not less than 500mm; Repave into need to again processing the slag of efflorescence, thickness is below 500mm; Fetch water;
B, repeating step a, until fill up pit;
C, have steam to occur, the heat that continues to fetch water is vexed; Do not have steam to occur, direct heat is vexed.
After the vexed processing of aforesaid method heat, the content that obtains slag more than lumpiness 200mm is being less than 3%.Then can slag more than lumpiness 200mm be sifted out by the mode of sieving.Slag more than lumpiness 200mm because efflorescence is inhomogeneous, not thorough, this slag can not meet next step production requirement, also needs to continue efflorescence, is need to again process the slag of efflorescence described in step a.But the slag that need to again process efflorescence described in step a is not limited only to obtain by the inventive method, the slag that do not meet next step production requirement of every lumpiness more than 200mm all can.
In aforesaid method step a, oven-fresh liquid steel slag is steel-making and finishes rear oven-fresh slag, and form is liquid thick, and temperature is generally 500～1000 ℃.
In aforesaid method step a, for enough heats can be provided, carry out efflorescence after allowing bulk (more than 200mm) slag that need to again process efflorescence absorb enough heats, the liquid steel slag thickness of controlling just except stove is 500～2000mm.Bulk (more than 200mm) thickness of steel slag that control need to be processed efflorescence is again 100～500mm.
In aforesaid method step a, described fetching water as not occur that ponding is as the criterion.In order to be beneficial to the water requirement of initial heat when vexed, adopt the water pipe water spray of Φ 30～100mm.
In aforesaid method step c, described fetching water as fetching water to till not there is not steam.Water requirement when being beneficial to the hot vexed later stage, adopts the water pipe water spray of Φ 20～50mm.
Because the slag of lumpiness more than 200mm cannot enter production line, so, must be to its further breaking and Dusting.The object of the invention is not only for by lumpiness, the slag more than 200mm carries out efflorescence, but also for oven-fresh slag is carried out to breaking and Dusting.Through contriver, study discovery, these two kinds of slags, by mutually intersecting the form that tiling stacks, are allowed to the mutual transmitting and converting of heat of cold and hot slag, then the heat of fetching water just can achieve the goal after vexed.The advantage such as that the inventive method has is simple to operate, cost-saving, efflorescence is effective.
Lumpiness described in the inventive method is the longest diameter of slag.
Steel slag hot disintegrating Powdering Mechanism: after hot steel slag is met water, efflorescence is mainly divided into following three phases:
After the warm sludge chance water of (1) 500 ℃～1000 ℃, produce and expand with heat and contract with cold, and produce huge internal stress, cause steel slag expansion cracking, and water coolant is also converted into water vapor.(2) part hot steel slag, because of uneven in temperature, push mutually, arches, and slag is ftractureed gradually, until efflorescence, area, bottom forms closed environment, forms certain pressure, and the pressure that these are gathered is alleviated by destroying.In addition, slag is different from the heat enthalpy value of iron, and heating power inequality each other causes the separation of slag, iron.(3) last, a large amount of steam discharge by gap, and transferring heat makes that slag further ftractures, efflorescence.
Below in conjunction with embodiment, the specific embodiment of the present invention is further described, does not therefore limit the present invention among described scope of embodiments.
Embodiment 1
In the vexed bessemer furnace slag pit of heat bottom, turn over and abandon hot slag, thickness is 1500mm, and temperature is 850 ℃, then has bad luck the super large piece slag of lumpiness more than 200mm to hot steel slag.The block steel slag of having bad luck need be laid on hot steel slag, and mean thickness is 350mm, is convenient to the absorption of heat.Fetch water to not occurring ponding.On the block bessemer furnace slag of cold conditions, continue again overturning hot steel slag again, thickness is about 900mm, temperature is 800 ℃, and continue to have bad luck the super large piece slag of lumpiness more than 200mm to hot steel slag, and the block steel slag of having bad luck need be laid on hot steel slag, and mean thickness is 400mm, again fetch water to not occurring ponding, repeat until fill up hot vexed pit, lasting hot vexed 2d, in the slag after gained efflorescence, lumpiness 200mm accounts for 2.7% of overall slag above.
Adopt traditional vexed technique of heat to carry out efflorescence processing to slag, due to inhomogeneous cooling, efflorescence efficiency is not high, causes slag ratio more than lumpiness 200mm higher, has been up to 10%; And it is vexed to adopt the inventive method to carry out cycling hot, can makes more than lumpiness 200mm slag ratio be down to and be less than 3%.
Claims (8)
1. a method for the vexed efflorescence bessemer furnace slag of heat, is characterized in that: comprise the following steps:
A, in pit bottom, spread into oven-fresh liquid steel slag, thickness is not less than 500mm; Repave into need to again processing the slag of efflorescence, thickness is below 500mm; Fetch water;
B, repeating step a, until fill up pit;
C, have steam to occur, the heat that continues to fetch water is vexed; Do not have steam to occur, direct heat is vexed.
2. method according to claim 1, is characterized in that: described in step a, oven-fresh liquid steel slag temperature is 500～1000 ℃.
3. method according to claim 1, is characterized in that: it is 500～2000mm that thickness described in step a is not less than 500mm.
4. method according to claim 1, is characterized in that: the 500mm of thickness described in step a is 100～500mm below.
5. method according to claim 1, is characterized in that: fetching water described in step a do not occur that ponding is as the criterion.
6. method according to claim 1, is characterized in that: fetching water as fetching water to till not there is not steam described in step c.
7. method according to claim 1, is characterized in that: the whole operating time is not less than 24h.
8. method according to claim 7, is characterized in that: the whole operating time is 1～10d.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410436125.9A CN104152607A (en) | 2014-08-29 | 2014-08-29 | Method for pulverizing converter steel slag in hot-stuffy mode |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410436125.9A CN104152607A (en) | 2014-08-29 | 2014-08-29 | Method for pulverizing converter steel slag in hot-stuffy mode |
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| CN104152607A true CN104152607A (en) | 2014-11-19 |
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| CN201410436125.9A Pending CN104152607A (en) | 2014-08-29 | 2014-08-29 | Method for pulverizing converter steel slag in hot-stuffy mode |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104818357A (en) * | 2015-05-25 | 2015-08-05 | 攀枝花钢城集团有限公司 | Blast furnace slag treatment method |
| CN105420429A (en) * | 2015-12-21 | 2016-03-23 | 武钢集团昆明钢铁股份有限公司 | Steel slag heat stewing method capable of reducing content of free calcium oxide in steel slag |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1508268A (en) * | 2002-12-17 | 2004-06-30 | 中联炉石处理资源化股份有限公司 | Slag thermal-sealed vapour maintenance treating method |
| CN101280346A (en) * | 2008-05-30 | 2008-10-08 | 冀更新 | Hot disintegration method for converter steel slag |
| CN101724720A (en) * | 2008-10-31 | 2010-06-09 | 鞍山钢铁集团公司 | Method for processing liquid molten steel slag of converter by means of hot disintegration |
-
2014
- 2014-08-29 CN CN201410436125.9A patent/CN104152607A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1508268A (en) * | 2002-12-17 | 2004-06-30 | 中联炉石处理资源化股份有限公司 | Slag thermal-sealed vapour maintenance treating method |
| CN101280346A (en) * | 2008-05-30 | 2008-10-08 | 冀更新 | Hot disintegration method for converter steel slag |
| CN101724720A (en) * | 2008-10-31 | 2010-06-09 | 鞍山钢铁集团公司 | Method for processing liquid molten steel slag of converter by means of hot disintegration |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104818357A (en) * | 2015-05-25 | 2015-08-05 | 攀枝花钢城集团有限公司 | Blast furnace slag treatment method |
| CN105420429A (en) * | 2015-12-21 | 2016-03-23 | 武钢集团昆明钢铁股份有限公司 | Steel slag heat stewing method capable of reducing content of free calcium oxide in steel slag |
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Effective date of abandoning: 20161130 |
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