CN104278131A - Recycling method for refining slags - Google Patents
Recycling method for refining slags Download PDFInfo
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- CN104278131A CN104278131A CN201410584254.2A CN201410584254A CN104278131A CN 104278131 A CN104278131 A CN 104278131A CN 201410584254 A CN201410584254 A CN 201410584254A CN 104278131 A CN104278131 A CN 104278131A
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- desulfurization
- dephosphorization agent
- iron
- refining slag
- electric furnace
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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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- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The invention relates to a recycling method for refining slags. The method comprises the following steps: adding an iron-containing oxide material into liquid refining slags in an online mode to carry out online modification, so that the iron content of an obtained mixture reaches 5-30% by mass; and cooling the obtained product so as to cure the product, and crushing the obtained object, so that a desulfurized dephosphorizing agent is obtained. According to the invention, refining slags can be recycled maximally, and the consumption of energy and materials in the entire process can be significantly reduced, so that the utilization rate of resources is improved, and the environmental load is reduced, therefore, the method has remarkable economic benefits, and can increase the comprehensive utilization rate of steel slag resources in our country and provide a strong technical support for circular economy.
Description
Technical field
The present invention relates to a kind of method that refining slag is recycled, belong to steel industry view.
Background technology
At present by the impact of world financial crisis, steel industry is subject to unprecedented predicament, under such circumstances, how to reduce loss, pulls through their difficulties, and how to change difficulty and be opportunity, meet the difficulty, iron and steel enterprise is faced with great challenge.Under the industry background, because recycling of the hot refining slag of LF can reduce production cost significantly, can also ensure quality product, environmental protection simultaneously and reduce resource consumption, the cycle applications of therefore carrying out the hot refining slag of LF has especially important meaning.
Chinese patent literature CN103361468A (application number 201310296172.3) discloses a kind for the treatment of process of continuous casting hot steel slag, is applied to smelting molten steel technique, and described smelting molten steel flow process is: electric furnace → LF stove → VD stove → continuous casting; This treatment process is recovered in next Baogang's water by hot refining slag remaining after described continuous-casting steel pouring again, carries out recycle as refining slag.In the document, hot refining slag remaining after continuous-casting steel pouring is recovered in next Baogang's water again, recycle is carried out as refining slag, slag is after recycle, its activity reduces, and refining desulfuration, deoxidation effect are deteriorated, and are not suitable for low-sulfur, hypoxemia steel grade, particularly requiring very high to mill pace control, overhead traveling crane etc., is that steel mill is inapplicable mostly.
Chinese patent literature CN103045778A (application number 201310008779.7) discloses a kind of LF stove steel scrap cinder inclusion recoverying and utilizing method, belongs to metallurgy industry steelmaking technical field.Technical scheme is: comprise following processing step: (1) LF stove steel scrap cinder inclusion makes refining slag after naturally cooling, magnetic separation, fragmentation, screening, particle size diameter is 5-30mm, chemical composition mass percent is: SiO2 :≤10%, CaO: >=40%, MgO≤12%, Al2O3:18 ~ 45%, MnO :≤3.0%, FeO :≤3.0%, S :≤1.5%; (2) converter smelting straight carbon steel, adds above-mentioned refining slag during tapping in ladle, and molten steel per ton adds refining slag 2-3Kg, adds before tapping 1/3; 3 ~ 8min Argon is carried out after tapping terminates.
Chinese patent literature CN102337379A (application number 201010236334.0) discloses a kind of method of ladle slag recycle, wherein, the method comprises is undertaken selecting iron by after ladle slag solidification and fragmentation, and using selecting the residue after iron as refining slag and adding the steel contacts after alloy, carry out LF refining.The method achieve the recycling of slag and can the slag composition in recycling process accurately be controlled, and then improve the effect of liquid steel refining further, and, the method is by being added in the molten steel after alloying by refining slag, solve the problem of the Argon fault occurred when tapping again after ladle slag is joined sky ladle, and substantially reduce the time of liquid steel refining.
In above-mentioned Chinese patent literature CN103045778A and Chinese patent literature CN102337379A, described LF stove steel scrap cinder inclusion is made certain dynamics refining slag through naturally cooling and is re-used, but in actual applications, all can natural degradation after overwhelming majority refining slag temperature reduces, then absorb water, lose activity and cannot recycle, which greatly limits their scope of application.
Summary of the invention
The present invention is directed to the deficiencies in the prior art, a kind of refining slag recoverying and utilizing method is provided.
A kind of refining slag recoverying and utilizing method, step is as follows:
Be add oxides-containing iron material online in the liquid refining slag of 1200 ~ 1500 DEG C to carry out online upgrading to temperature, make the mass content of iron in compound reach 5% ~ 30%, be then cooled to 900 ~ 1300 DEG C and be cured, through fragmentation, obtained desulfurization dephosphorization agent.
Preferred according to the present invention, described liquid refining slag component is as follows, is all weight percentage:
CaO 30% ~ 70%, Si0
23% ~ 30%, A1
20
35% ~ 35%, MgO 5 ~ 20%, surplus is inevitable impurity.
Preferred according to the present invention, in described oxides-containing iron material, ferro element mass content >=40%, granularity≤10mm; Oxides-containing iron material is the conventional waste material in this area, as continuously cast bloom cutting slag, iron scale, dedusting ash etc.
Preferred according to the present invention, the desulfurization dephosphorization agent after described fragmentation, granularity≤50mm.
A kind of desulfurization dephosphorization agent, component is as follows, is all weight percentage:
CaO 25% ~ 69%, Si0
23% ~ 28%, A1
20
35% ~ 33%, MgO 5 ~ 20%, Fe 5% ~ 30%, surplus is inevitable impurity.
The application of above-mentioned desulfurization dephosphorization agent desulfurization in molten iron or molten steel preprocessing process.
Preferred according to the present invention, in described molten iron or molten steel, the mass content of element sulphur is not less than 0.030%.
Preferred according to the present invention, the addition that desulfurization is carried out in described desulfurization dephosphorization agent is 1 ~ 10kg/t.
The application of above-mentioned desulfurization dephosphorization agent dephosphorization in electric furnace, converter steelmaking process.
Preferred according to the present invention, in described electric furnace, converter, the mass content of the phosphoric that material contains is more than or equal to 0.020%.
Above-mentioned application, adds desulfurization dephosphorization agent by the addition of 1 ~ 20kg/t in smelting material in electric furnace, converter.
Beneficial effect
1, the present invention farthest can recycle refinery scum, can significantly reduce full-range energy consumption and supplies consumption, improve resource utilization, reduce carrying capacity of environment, remarkable in economical benefits, can provide strong technical support for lifting China's steel slag resource comprehensive utilization ratio and recycling economy;
2, the invention process condition is not limited to Steel Works Equipment and processing condition, all applicable to any refinery scum, applied widely, and reclaim slag and remain itself activity, the oxides-containing iron added very is applicable to desulfurization and dephosphorization;
3, raw material oxides-containing iron of the present invention is the conventional waste material in this area, and be easy to get concerning wide material sources steel mill, belong to waste, not only use cost is low, and can turn waste into wealth, and reduces offal treatment expense.
Embodiment
Technical scheme in the application is understood better in order to make those skilled in the art person, be clearly and completely described to the technical scheme in the embodiment of the present application below, obviously, described embodiment is only some embodiments of the present application, instead of whole embodiments.Based on the embodiment in the application, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all should belong to the scope of the application's protection.The correlation technique content do not addressed in embodiment all can adopt or use for reference prior art.
Embodiment 1
A kind of refining slag recoverying and utilizing method, step is as follows:
Be spray into iron scale online in the liquid refining slag of 1500 DEG C to carry out online upgrading to temperature, make the mass content of iron in compound reach 30%, be then cooled to 1300 DEG C and be cured, through being crushed to granularity≤50mm, obtained desulfurization dephosphorization agent.
Described liquid refining slag component is as follows, is all weight percentage:
CaO 30%, Si0
230%, A1
20
334%, MgO 6%, surplus is inevitable impurity.
In described iron scale, ferro element mass content >=40%, granularity≤10mm;
After testing, obtained desulfurization dephosphorization agent component is as follows, is all weight percentage:
CaO 20%, Si0
220%, A1
20
322%, MgO 5%, Fe 30%, surplus is inevitable impurity.
Application examples 1
Desulfurization dephosphorization agent embodiment 1 prepared adds in electric furnace by the addition of 10kg/t, part lime is replaced to use as dephosphorization material, wherein the add-on of electric furnace lime is 15kg/t, electric furnace is with addition of 65% (mass percent) molten iron, molten iron phosphorus content is 0.120% (mass percent), and all the other iron and steel stocks are the steel scrap of phosphorus content 0.025% (mass percent) left and right.
(adopt " GB/T 222; chemical analysis sample sampling method and the chemical composition permissible variation of steel " standard) after testing, electric furnace molten steel terminal phosphorus phosphorus content can be down to less than 0.010%, meets electric furnace production specification 0.015% standard completely and closes knot steel, quality carbon steel and other is to the requirement of the comparatively strict steel grade of phosphorus content requirement.
Embodiment 2
A kind of refining slag recoverying and utilizing method, step is as follows:
Be spray into dedusting ash online in the liquid refining slag of 1200 DEG C to carry out online upgrading to temperature, make the mass content of iron in compound reach 5%, be then cooled to 900 DEG C and be cured, through being crushed to granularity≤50mm, obtained desulfurization dephosphorization agent.
Described liquid refining slag component is as follows, is all weight percentage:
CaO 70%, Si0
23%, A1
20
35%, MgO 20%, surplus is inevitable impurity.
In described dedusting ash, ferro element mass content 50%, granularity≤10mm;
After testing, obtained desulfurization dephosphorization agent component is as follows, is all weight percentage:
CaO 67%, Si0
23%, A1
20
35%, MgO 19%, Fe 5%, surplus is inevitable impurity.
Application examples 2
Desulfurization dephosphorization agent embodiment 2 prepared adds in electric furnace by the addition of 20kg/t, part lime is replaced to use as dephosphorization material, wherein the add-on of electric furnace lime is 15kg/t, electric furnace is with addition of 65% (mass percent) molten iron, molten iron phosphorus content is 0.120% (mass percent), and all the other iron and steel stocks are the steel scrap of phosphorus content 0.025% (mass percent) left and right.
(adopt " GB/T 222; chemical analysis sample sampling method and the chemical composition permissible variation of steel " standard) after testing, electric furnace molten steel terminal phosphorus phosphorus content can be down to less than 0.012%, meets electric furnace production specification 0.020% standard completely and closes knot steel, quality carbon steel and other is to the requirement of the comparatively strict steel grade of phosphorus content requirement.
Embodiment 3
A kind of refining slag recoverying and utilizing method, step is as follows:
Be spray into iron content modifying material online in the liquid refining slag of 1400 DEG C to carry out online upgrading to temperature, make the mass content of iron in compound reach 20%, be then cooled to 1200 DEG C and be cured, through being crushed to granularity≤10mm, obtained desulfurization dephosphorization agent.
Described liquid refining slag component is as follows, is all weight percentage:
CaO 45%, Si0
217%, A1
20
320%, MgO 16%, surplus is inevitable impurity.
In described iron content modifying material, ferro element mass content 40%, granularity≤10mm;
After testing, obtained desulfurization dephosphorization agent component is as follows, is all weight percentage:
CaO 35%, Si0
214%, A1
20
315%, MgO 13%, Fe 20%, surplus is inevitable impurity.
Application examples 3
Desulfurization dephosphorization agent embodiment 3 prepared adds in molten iron by the addition of 1kg/t carries out pre-treatment, uses as sweetening agent.
After testing, molten steel sulfur content can by 0.060% being down to less than 0.030%, phosphorus content can be down to less than 0.080% by 0.120%, meets the demand of the most of steel grade of converter smelting, for subsequent handling reduces cost savings tap to tap time.
The above is only the preferred implementation of the application, those skilled in the art is understood or realizes the application.To be apparent to one skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein when not departing from the spirit or scope of the application, can realize in other embodiments.Therefore, the application can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (10)
1. a refining slag recoverying and utilizing method, is characterized in that, step is as follows:
Be add oxides-containing iron material online in the liquid refining slag of 1200 ~ 1500 DEG C to carry out online upgrading to temperature, make the mass content of iron in compound reach 5% ~ 30%, be then cooled to 900 ~ 1300 DEG C and be cured, through fragmentation, obtained desulfurization dephosphorization agent.
2. the method for claim 1, is characterized in that, described liquid refining slag component is as follows, is all weight percentage:
CaO30% ~ 70%, Si0
23% ~ 30%, A1
20
35% ~ 35%, MgO5 ~ 20%, surplus is inevitable impurity.
3. the method for claim 1, is characterized in that, in described oxides-containing iron material, and ferro element mass content >=40%, granularity≤10mm.
4. the method for claim 1, is characterized in that, the desulfurization dephosphorization agent after described fragmentation, granularity≤50mm.
5. a desulfurization dephosphorization agent, is characterized in that, component is as follows, is all weight percentage:
CaO25% ~ 69%, Si0
23% ~ 28%, A1
20
35% ~ 33%, MgO5 ~ 20%, Fe5% ~ 30%, surplus is inevitable impurity.
6. the application of desulfurization dephosphorization agent desulfurization in Hot Metal Pretreatment described in claim 5.
7. apply as claimed in claim 6, it is characterized in that, the mass content of described Sulfur Content in Hot Iron element is not less than 0.030%.
8. apply as claimed in claim 6, it is characterized in that, the addition that described sweetening agent carries out desulfurization is 1 ~ 10kg/t.
9. the application of desulfurization dephosphorization agent liquid steel dephosphorization in electric furnace, converter steelmaking process described in claim 5.
10. apply as claimed in claim 9, it is characterized in that, in described electric furnace, converter, the mass content of the phosphoric that material contains is more than or equal to 0.020%; Preferably, lime is coordinated to add desulfurization dephosphorization agent in smelting material in electric furnace, converter by the addition of 1 ~ 20kg/t.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410584254.2A CN104278131A (en) | 2014-10-27 | 2014-10-27 | Recycling method for refining slags |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410584254.2A CN104278131A (en) | 2014-10-27 | 2014-10-27 | Recycling method for refining slags |
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| CN104278131A true CN104278131A (en) | 2015-01-14 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108018402A (en) * | 2018-01-13 | 2018-05-11 | 山东钢铁股份有限公司 | A kind of low cost wash heat method |
| CN114717382A (en) * | 2022-04-02 | 2022-07-08 | 张家港广大特材股份有限公司 | Electric arc furnace steelmaking method |
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| CN103789495A (en) * | 2012-11-02 | 2014-05-14 | 无锡蕾明视康科技有限公司 | Dephosphorization agent |
| CN103882183A (en) * | 2013-12-31 | 2014-06-25 | 马钢(集团)控股有限公司 | Desulfurization refining slag for steelmaking process and addition method thereof |
| CN104046710A (en) * | 2014-07-07 | 2014-09-17 | 中钢集团武汉安全环保研究院有限公司 | Method for preparing steelmaking flux from refining waste slag under thermal state |
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2014
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Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101792274A (en) * | 2010-03-19 | 2010-08-04 | 华南理工大学 | Calcium-silicon-aluminum property regulating material for carrying out on-line high-temperature reconstruction on medium-alkalinity steel slag and application thereof |
| CN102839251A (en) * | 2012-09-13 | 2012-12-26 | 首钢总公司 | Smelting method of low-phosphorous steel |
| CN103789495A (en) * | 2012-11-02 | 2014-05-14 | 无锡蕾明视康科技有限公司 | Dephosphorization agent |
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| CN104046710A (en) * | 2014-07-07 | 2014-09-17 | 中钢集团武汉安全环保研究院有限公司 | Method for preparing steelmaking flux from refining waste slag under thermal state |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108018402A (en) * | 2018-01-13 | 2018-05-11 | 山东钢铁股份有限公司 | A kind of low cost wash heat method |
| CN114717382A (en) * | 2022-04-02 | 2022-07-08 | 张家港广大特材股份有限公司 | Electric arc furnace steelmaking method |
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Application publication date: 20150114 |
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