CN103642992B - Slag forming constituent for steelmaking - Google Patents
Slag forming constituent for steelmaking Download PDFInfo
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- CN103642992B CN103642992B CN201310738864.9A CN201310738864A CN103642992B CN 103642992 B CN103642992 B CN 103642992B CN 201310738864 A CN201310738864 A CN 201310738864A CN 103642992 B CN103642992 B CN 103642992B
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- Prior art keywords
- slag
- steelmaking
- slag former
- steel
- 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
Abstract
The invention discloses a slag forming constituent for steelmaking and belongs to the technical field of steelmaking. The slag forming constituent for steelmaking comprises the following components in percentage by mass: 70-73% of SiO2, 11-14% of CaO, 2% of MnO, 8-10% of FeO, 4% of Fe2O3, less than or equal to 0.10% of S, less than or equal to 0.10% of P and the balance of Fe and inevitable impurities. Due to the use of the slag forming constituent, the formation time of primary slag and the pure oxygen blowing time can be shortened; the problems of slow slagging speed and low dephosphorization rate during smelting can be effectively solved; in addition, the dephosphorization efficiency of smelting is also improved.
Description
Technical field
The invention belongs to steelmaking technical field, more particularly, relate to a kind of steel-making slag former.
Background technology
Slag former adds the flux such as appropriate iron scale, fluorite, manganese oxide or other oxide compounds with lime, pre-formed at low temperatures.The fusing point of this synthetic slag agent is low, and basicity is high, uniform composition, and granularity is little, and at high temperature easily cracked, and slagging speed is fast, thus alleviates the burden of converter slag-making.When making steel, the sludging flux added, is fused into slag with the oxidation products of impurity element in raw material, except S, P, absorbs non-metallic inclusion.
Publication number CN101928806A, publication date on December 29th, 2010 patent document discloses a kind of composite fluxing medium for semi-steel making.Described composite fluxing medium contains ferriferous oxide, MnO and SiO
2, described ferriferous oxide is Fe
2o
3and/or FeO.This invention additionally provides the preparation method of composite fluxing medium, and the method for semi-steel making.According to the composite fluxing medium for semi-steel making that this invention provides, preparation method is simple, and consumption in semi-steel making process is less, can be effective to semi-steel making dephosphorization, semi-steel making technique is carried out more smoothly; Can effectively improve Mn constituent content in endpoint molten steel simultaneously, correspondingly reduce in STEELMAKING PRODUCTION subsequent step the consumption added containing Mn alloy, thus reduce STEELMAKING PRODUCTION cost.But in fact this kind of slag former in use, existenceization slag difficulty, carry out the problem that slag speed is slow, finishing slag TFe content is higher.Therefore, need to be optimized the composite fluxing medium moiety of semi-steel making, to improve use properties further.
Summary of the invention
1, the technical problem that will solve is invented
In use change slag difficulty for the slag former existed in prior art, carry out the deficiencies such as slag speed is slow, the invention provides a kind of steel-making slag former, it can shorten initial stage slag formation time and pure oxygen blow duration, and the problem that when effectively can solve smelting, slagging is slow, dephosphorization rate is low, and improve the dephosphorization efficiency of smelting.
2, technical scheme
Object of the present invention is achieved through the following technical solutions.
A kind of steel-making slag former, each component of described slag former and massfraction thereof are:
All the other are Fe and inevitable impurity.
Preferably, described CaO derives from one or more in manganese ore, lime, light dolomite and converter mud.
Preferably, the oxide source of described iron is in converter mud and/or manganese ore.
Preferably, the CaO of 65 ~ 85wt.% derives from converter mud, and the oxide source of the iron of 75 ~ 90wt.% is in converter mud.
3, beneficial effect
Compared to prior art, the invention has the advantages that:
(1) one-tenth of the slag former of the present invention slag former that is grouped into and obtains under quality proportioning, the problem that slagging speed is slow, dephosphorization rate is low existed in steelmaking process can be overcome, and effectively can shorten initial stage slag formation time and pure oxygen blow duration, and improve converter terminal liquid steel dephosphorization rate;
(2) according to national requirements for environmental protection, major part steel mill has all set up corresponding cleaning apparatus, and most of steel mill have employed wet dedusting technique, and converter dust is after cleaning apparatus precipitation, create a large amount of mud, oxide compound (FeO and Fe containing a large amount of iron in mud
2o
3) and CaO, therefore according to the preferred embodiment of the present invention, by using converter mud as the raw material of slag former, first slag time short, the good slag former of dephosphorization effect can not only be obtained, iron in recyclable mud, makes resource be utilized effectively, and alleviates the pressure of environmental protection simultaneously simultaneously;
(3) slag former provided by the invention, composition is simple, with low cost.
Embodiment
Below in conjunction with specific embodiment, introduce technical scheme of the present invention further.
Embodiment 1
The preparation method of the slag former of the present embodiment, comprises SiO
2, CaO, MnO and iron oxide compound mix, SiO
2, CaO, MnO and iron oxide compound add each component of rear formed mixture and massfraction is:
Wherein, the CaO of 65wt.% derives from converter mud, oxide compound (wherein, FeO32wt.%, Fe of the iron of 75wt.%
2o
343wt.%) derive from converter mud.Then gained mixture is made spheroidal particle, the volume density of spheroidal particle is 2.2 gram per centimeters, and the mean diameter of spheroidal particle is 20 millimeters.
The slag former that the present embodiment provides not only can shorten and form the first slag time, improve dephosphorization effect, and order MnO wherein also helps follow-up slag splashing.Compared with the slag former provided with prior art, first slag forms speed and improves more than 150 seconds, and dephosphorization efficiency improves about 7%; Slag former provided by the invention can also reclaim the iron in mud to greatest extent, and steel technology is reduced.Adopt the slag former that the present embodiment 1 provides, iron and steel raw material 2 kg/ton steel can be saved simultaneously.
Embodiment 2
The preparation method of the slag former of the present embodiment, comprises SiO
2, CaO, MnO and iron oxide compound mix, SiO
2, CaO, MnO and iron oxide compound add each component of rear formed mixture and massfraction is:
In this example, the CaO of 85wt.% derives from light dolomite, oxide compound (wherein, FeO32wt.%, Fe of the iron of 90wt.%
2o
343wt.%) derive from manganese ore.Then gained mixture is made spheroidal particle, the volume density of spheroidal particle is 3.4 gram per centimeters, and the mean diameter of spheroidal particle is 50 millimeters.
The slag former that the present embodiment provides not only can shorten and form the first slag time, improve dephosphorization effect, and order MnO wherein also helps follow-up slag splashing.Compared with the slag former provided with prior art, first slag forms speed and improves more than 160 seconds, and dephosphorization efficiency improves about 9%; Slag former provided by the invention can also reclaim the iron in mud to greatest extent, and steel technology is reduced.Adopt the slag former that the present embodiment 2 provides, iron and steel raw material 2.2 kg/ton steel can be saved simultaneously.
Embodiment 3
The preparation method of the slag former of the present embodiment, comprises SiO
2, CaO, MnO and iron oxide compound mix, SiO
2, CaO, MnO and iron oxide compound add each component of rear formed mixture and massfraction is:
In this example, the CaO of 75wt.% derives from lime, oxide compound (wherein, FeO32wt.%, Fe of the iron of 80wt.%
2o
348wt.%) derive from manganese ore.Then gained mixture is made spheroidal particle, the volume density of spheroidal particle is 3.0 gram per centimeters, and the mean diameter of spheroidal particle is 30 millimeters.
The slag former that the present embodiment provides not only can shorten and form the first slag time, improve dephosphorization effect, and order MnO wherein also helps follow-up slag splashing.Compared with the slag former provided with prior art, first slag forms speed and improves more than 180 seconds, and dephosphorization efficiency improves about 12%; Slag former provided by the invention can also reclaim the iron in mud to greatest extent, and steel technology is reduced.Adopt the slag former that the present embodiment 3 provides, iron and steel raw material 2.1 kg/ton steel can be saved simultaneously.
Claims (2)
1. a steel-making slag former, is characterized in that, each component of described slag former and massfraction thereof are:
All the other are Fe and inevitable impurity;
Wherein, described CaO derives from one or more in manganese ore, lime, light dolomite and converter mud;
Wherein, the oxide source of described iron is in converter mud and/or manganese ore.
2. slag former according to claim 1, is characterized in that, the CaO of 65 ~ 85wt.% derives from converter mud, and the oxide source of the iron of 75 ~ 90wt.% is in converter mud.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310738864.9A CN103642992B (en) | 2013-12-27 | 2013-12-27 | Slag forming constituent for steelmaking |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310738864.9A CN103642992B (en) | 2013-12-27 | 2013-12-27 | Slag forming constituent for steelmaking |
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|---|---|
| CN103642992A CN103642992A (en) | 2014-03-19 |
| CN103642992B true CN103642992B (en) | 2015-05-20 |
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| CN104774995B (en) * | 2015-05-07 | 2016-09-14 | 湖南华菱湘潭钢铁有限公司 | A kind of addition method of oxygen converter steelmaking slag charge |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101613779A (en) * | 2008-06-25 | 2009-12-30 | 攀枝花新钢钒股份有限公司 | A kind of slag former and preparation method thereof and using method |
| CN101928806A (en) * | 2009-06-26 | 2010-12-29 | 攀钢集团攀枝花钢铁研究院有限公司 | Composite slagging agent for semi-steel making and preparation method thereof and semi-steel making method |
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2013
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101613779A (en) * | 2008-06-25 | 2009-12-30 | 攀枝花新钢钒股份有限公司 | A kind of slag former and preparation method thereof and using method |
| CN101928806A (en) * | 2009-06-26 | 2010-12-29 | 攀钢集团攀枝花钢铁研究院有限公司 | Composite slagging agent for semi-steel making and preparation method thereof and semi-steel making method |
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| CN103642992A (en) | 2014-03-19 |
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