CN101713013B - Method for using steel slag to produce steel - Google Patents
Method for using steel slag to produce steel Download PDFInfo
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- CN101713013B CN101713013B CN2009103120358A CN200910312035A CN101713013B CN 101713013 B CN101713013 B CN 101713013B CN 2009103120358 A CN2009103120358 A CN 2009103120358A CN 200910312035 A CN200910312035 A CN 200910312035A CN 101713013 B CN101713013 B CN 101713013B
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- steel
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- steel slag
- iron
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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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Abstract
The invention relates to a method for using steel slag to produce steel, which belongs to the field of metallurgy and provides a method for using steel slag to produce steel. The steel with qualified P and S contents can be produced by the method. The method for using steel slag to produce steel comprises the steps of mixing of raw materials, smelting, steel ladle refinement and vacuum refinement. When the raw materials are mixed, the steel slag, quick lime and coke are added, wherein 10-18kg of quick lime is added in one ton of steel slag, and 6-10kg of coke is added into one ton of steel slag. The contents of the [S] and the [P] of the steel produced by the method for using steel slag to produce steel are not more than 0.015 percent, and both the macroscopic test and the metallographic test of the steel reach the class I level of China. The method realizes the waste recycling of steel slag, fully utilizes iron resources, prevents resource waste, provides a new choice for the field and has wide application prospect.
Description
Technical field
The present invention relates to adopt the method for steel slag to produce steel, belong to field of metallurgy.
Background technology
The comprehensive utilization technique of metallurgical slag has obtained extensively popularizing.At present, the method for comprehensive utilization of metallurgical slag is a lot, and the most frequently used method is: metallurgical slag is carried out magnetic separation; Obtain the higher iron-bearing material of TFe content (being the slag iron and steel); Obtain the raw material (or processing pelletizing) of certain intensity and granularity through sintering, adopt cupola furnace or blast furnace to smelt, obtain molten iron; Smelt through converter → LF refining furnace (being ladle refining furnace) → vacuum refining furnace again, finally obtain steel.The advantage of this method is: the recovery of iron is high, and steel can reach technical requirements; Shortcomings such as but this method exists Production Flow Chart long, and energy consumption height, P and S content are high and unstable, and inclusion content is many.
Adopt slag smelting iron and steel high-quality steel difficulty bigger.Major cause is that the chemical ingredients of slag iron and steel is unstable, and particularly phosphorus, sulphur content fluctuate bigger; Oxidizing substance is many in the slag iron and steel, is prone to cause in the iron liquid carbon content low, and gas content is high, inclusion content is many, and is not easy to problem such as removal.
Summary of the invention
Technical problem to be solved by this invention provides a kind of method that adopts steel slag to produce steel, and this method can be produced and obtained P and the qualified steel of S content.
The present invention adopts the method for steel slag to produce steel, comprises feed proportioning, smelts, and ladle refining and vacuum refinement step during feed proportioning, add slag iron and steel, unslaked lime and coke; Wherein, add unslaked lime 10～18kg in the slag iron and steel per ton, add coke 6～10kg in the slag iron and steel per ton.
Wherein, the better quality of the steel of producing in order to make, the iron level in the above-mentioned slag iron and steel is preferably >=60%.
Wherein, the granularity of above-mentioned coke is preferably 5～15mm, and the granularity of above-mentioned lime is preferably 15～35mm.
Further, in order to make full use of resource, the present invention adopts the method for steel slag to produce steel, also adds the steel scrap and the pig of raw material total amount 8～10% during its feed proportioning.
The present invention adopts the method for steel slag to produce steel, smelts according to ordinary method behind the feed proportioning, and ladle refining and vacuum refinement get final product.
Further, can be better for the rigidity that makes smelting, the present invention adopts the method for steel slag to produce steel, and the control basicity of slag is preferably 2.8～2.8 during smelting; The control basicity of slag is preferably 3.0～3.5 during ladle refining; The vacuum tightness of vacuum refinement is preferred≤20Pa, and at this following hold-time of vacuum tightness>=4.0min, ladle bottom blowing argon flow amount>=20 * 10
-3Nm
3/ min.
The present invention adopt steel [S] that the method for steel slag to produce steel produces and [P] content equal≤0.015%, steel low power and metallographic examination all reach national I level level.The inventive method has realized the slag waste recycling of steel has been made full use of fe source, has avoided the wasting of resources, for this area provides a kind of new selection, has broad application prospects.
Embodiment
Do further description below in conjunction with the embodiment specific embodiments of the invention, therefore do not limit the present invention among the described scope of embodiments.
Embodiment adopts the inventive method to produce steel
1, feed proportioning
Weight proportion by table 1 carries out feed proportioning.
Each proportion of raw materials of table 1
Annotate: the granularity of the coke in the table 1 is 5～15mm, and the granularity of lime is 15～35mm.
With disk the slag iron and steel is sucked in the hopper.When the slag iron and steel add the feed chute amount reach the total Intake Quantity of slag iron and steel in the hopper 1/5 the time, coke powder is all added in the feed chute, and manual work spreads out.When the slag iron and steel add the feed chute amount reach the total Intake Quantity of slag iron and steel in the hopper 3/5 the time, lime is all added in the feed chute, when the slag iron and steel add the feed chute amount reach the total Intake Quantity of slag iron and steel in the hopper 4/5～4.5/5 the time, the steel scrap or the pig iron are all added feed chute.
2, smelt
Adopt electric furnace to smelt, note during smelting: oxygen jet impacts the depth about 1/2 in molten bath, prevents that jet is in slag, the oxygen blast of steel interface; The smelting process quantity of slag is excessive, and molten bath boiling seriously need raise fire door, prevents that slag runs off; Basicity of slag is by 2.7～2.8 controls; Need in stove, to add lime oxidation period, guarantee [P] content≤0.015%; Forbid the steel band slag.
3, ladle refining
Ladle refining carries out in the LF refining furnace, and refining process notes: basicity of slag is by 3.0～3.5 controls; The bottom Argon is as the criterion with exposed steel liquid level not, and property use atm number stirs molten steel at interval.Must reach " white slag " tapping, guarantee [S] content≤0.015%.
4, vacuum refinement
Vacuum tightness≤the 20Pa of vacuum refinement, and at this following hold-time of vacuum tightness>=4.0min, ladle bottom blowing argon flow amount>=20 * 10
-3Nm
3/ min.
Through detecting, in the steel of being produced [P] and [S] content all≤0.015%, the low power of steel and metallographic are mingled with to check and reach the requirement of national I grade standard.
Claims (5)
1. adopt the method for steel slag to produce steel, comprise feed proportioning, smelt, ladle refining and vacuum refinement step is characterized in that: during feed proportioning, add slag iron and steel, unslaked lime and coke; Wherein, add unslaked lime 10～18kg in the slag iron and steel per ton, add coke 6～10kg in the slag iron and steel per ton; The control basicity of slag is 2.8～2.8 during smelting, and the control basicity of slag is 3.0～3.5 during ladle refining; Vacuum tightness≤the 20Pa of vacuum refinement, and at this following hold-time of vacuum tightness>=4.0min, ladle bottom blowing argon flow amount>=20 * 10
-3Nm
3/ min.
2. the method for employing steel slag to produce steel according to claim 1 is characterized in that: iron level >=60% in the said slag iron and steel.
3. the method for employing steel slag to produce steel according to claim 1 and 2 is characterized in that: the granularity of said coke is 5～15mm, and the granularity of said lime is 15～35mm.
4. the method for employing steel slag to produce steel according to claim 1 and 2 is characterized in that: the steel scrap or the pig that also add raw material gross weight 8～10% during feed proportioning.
5. the method for employing steel slag to produce steel according to claim 3 is characterized in that: the steel scrap or the pig that also add raw material gross weight 8～10% during feed proportioning.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009103120358A CN101713013B (en) | 2009-12-23 | 2009-12-23 | Method for using steel slag to produce steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009103120358A CN101713013B (en) | 2009-12-23 | 2009-12-23 | Method for using steel slag to produce steel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101713013A CN101713013A (en) | 2010-05-26 |
| CN101713013B true CN101713013B (en) | 2012-05-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009103120358A Active CN101713013B (en) | 2009-12-23 | 2009-12-23 | Method for using steel slag to produce steel |
Country Status (1)
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| CN (1) | CN101713013B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102912079A (en) * | 2012-10-26 | 2013-02-06 | 攀枝花钢城集团瑞钢工业有限公司 | Submerged arc agent for steelmaking through steel-iron slag and application method of submerged arc agent |
| CN103215408B (en) * | 2013-04-28 | 2015-10-28 | 山东广富集团有限公司 | A kind ofly add the method that slag block carries out converter steelmaking |
| CN104446021A (en) * | 2014-11-26 | 2015-03-25 | 攀枝花环业冶金渣开发有限责任公司 | Steel and iron slag micro-powder and production method thereof |
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2009
- 2009-12-23 CN CN2009103120358A patent/CN101713013B/en active Active
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|---|---|
| CN101713013A (en) | 2010-05-26 |
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