CN105755198A - Dephosphorizing agent in converter steelmaking and preparation method thereof - Google Patents
Dephosphorizing agent in converter steelmaking and preparation method thereof Download PDFInfo
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- CN105755198A CN105755198A CN201410765256.1A CN201410765256A CN105755198A CN 105755198 A CN105755198 A CN 105755198A CN 201410765256 A CN201410765256 A CN 201410765256A CN 105755198 A CN105755198 A CN 105755198A
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- dephosphorizing agent
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- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
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Abstract
The invention relates to a dephosphorizing agent in converter steelmaking and a preparation method thereof. The agent is characterized in that the dephosphorizing agent in converter steelmaking comprises the following raw materials in percentages by weight: 40-45% of Fe2O3, 45-50% of CaO, 1-4.0% of Al2O3, less than 5.0% of SiO2, and 0--1.5% of CaF2. melting point of the agent is lower than 1150 DEG C; the preparation method comprises the following steps: raw materials are crushed and uniformly mixed, the raw materials are melted at a high temperature 1200-1550 DEG C, and a melting reaction is carried out in order to generate calcium ferrite; after cooling, the generated calcium ferrite is processed into the granular dephosphorizing agent whose diameter is 3-40mm. The dephosphorizing agent in converter steelmaking has the advantages of stable dephosphorization effects and low consumption, and phosphor element content in steel is controlled below 0.003%. The dephosphorizing agent does not contain fluorine or contains a trace amount of fluorine, so that the dephosphorizing agent has the advantages of few environmental pollution and long storage life, etc.
Description
Technical field
The invention belongs to a kind of metallurgical technology field, in convertor steelmaking process, then remove the phosphorus in steel particularly to a kind of use to reduce dephosphorization agent for converter steelmaking of phosphorus content and preparation method thereof in molten steel.
Background technology
Phosphorus is usually harmful element in steel, because phosphorous height can make the steel cold short phenomenon of generation affect some mechanical performance of steel in steel, to be therefore controlled by.In current conventional art, the phosphorus in steel generally requires to control below 0.012%, and along with the raising of some steel grade mechanical property requirements standard, the phosphorus in some clean steels and ultra-low phosphoretic steel must control about 0.005%, or even less than 0.003%.For realizing this target, most steel mill adopts " double slag process " namely to adopt twice slag making or " two step method " but to take a block converter to smelt forwarding to after dephosphorization of molten iron in another converter in converter smelting.These two kinds of phosphorus removing methods are all that operation is loaded down with trivial details, it is long to process the time, bring difficulty to the tissue of converter producing with coordinating of continuous casting.Another kind of method is that molten iron is carried out pre-dephosphorization treatment.Namely in fish torpedo ladle and hot-metal bottle, carry out dephosphorization.This kind of technique iron and steel enterprise at home and abroad at present applies also ratio wide, but need to be many and invest many with equipment, and in processing procedure, unit consumption is high, temperature loss is also big.Along with the consumption being continuously increased Dephosphorising agent material of Low-phosphorus Steel demand can expand accordingly.It is currently used for the existing plurality of specifications of Dephosphorising agent of pneumatic steelmaking.The Dephosphorising agent of heterogeneity disclosed in known technology, composition and preparation method is also quite a lot.These Dephosphorising agents, while having certain dephosphorization effect, actually have higher fluorinated volume, are typically in 4.0%～10.%, exist: to the extremely inharmonic problem of environmental requirement.
Summary of the invention
Instant invention overcomes the defect of above-mentioned existence, it is therefore an objective to providing a kind of and accomplish floride-free or micro-fluorine under the premise ensureing high efficiency dephosphorating, namely actual Oil repellent is 0～1.5%, and becomes the dephosphorization agent for converter steelmaking of " green " metallurgic auxiliary materials and preparation method thereof.
Dephosphorization agent for converter steelmaking of the present invention and preparation method thereof content Description:
Dephosphorization agent for converter steelmaking of the present invention and preparation method thereof, it is characterised in that: dephosphorization agent for converter steelmaking is made up of by weight percentage following raw materials according:
Iron sesquioxide Fe2O340%～45%, calcium oxide CaO45%～50%, aluminium sesquioxide Al2O31% 4.0%, silicon dioxide SiO2< 5.0%, fluorine CaF20～-1.5%；
Its fusing point is lower than 1150 DEG C；
Its preparation method is: by above-mentioned raw materials through broken, after mix homogeneously, 12000C-15500Melting under C high temperature, fusing reaction generates calcium ferrite；After its cooling, the calcium ferrite of generation is processed into 3～40mm grain block Dephosphorising agent.
Dephosphorization agent for converter steelmaking of the present invention, has dephosphorization effect stable, consumes low, and it can make phosphorus element content in steel have to control below 0.003%.It is important that its Oil repellent to be floride-free or micro-Oil repellent environmental pollution little and the advantage such as long shelf-life.
Specific embodiment mode
Dephosphorization agent for converter steelmaking of the present invention and preparation method thereof is achieved in that and illustrates below.
Dephosphorization agent for converter steelmaking is made up of by weight percentage following raw materials according:
Iron sesquioxide Fe2O340%～45%, calcium oxide CaO45%～50%, aluminium sesquioxide Al2O31% 4.0%, silicon dioxide SiO2< 5.0%, fluorine CaF20～-1.5%；
Its fusing point is lower than 1150 DEG C；
Its preparation method is: by above-mentioned raw materials through broken, after mix homogeneously, 12000C-15500Melting under C high temperature, fusing reaction generates calcium ferrite；After its cooling, the calcium ferrite of generation is processed into 3～40mm grain block Dephosphorising agent.
For the composition of the present invention, preparation method and implementation result are described, now provide the following example and implementation result, by the fraction (being all weight percentage) in following arbitrary Dephosphorising agent for converter embodiment, through broken, after mix homogeneously, through 12000C-15500The high temperature melting of C, fusing reaction generates calcium ferrite；Cool down post-treatment at calcium ferrite and become 3 40mm grain bulk Dephosphorising agent for converter.Can also optionally take the material of one group of ratio as needed in anticipating in the technical scheme that this invention provides, obtain this kind of Dephosphorising agent for converter by manufacture method provided by the invention.
Dephosphorization agent for converter steelmaking, proves have dephosphorization effect stable, consume low through industrial experimentation research and detection, and it can make phosphorus element content in steel have to control below 0.003%.It is important that its Oil repellent to be floride-free or micro-Oil repellent environmental pollution little and the advantage such as long shelf-life.
Claims (1)
1. a dephosphorization agent for converter steelmaking, it is characterised in that: dephosphorization agent for converter steelmaking is made up of by weight percentage following raw materials according:
Iron sesquioxide Fe2O340%～45%, calcium oxide CaO45%～50%, aluminium sesquioxide Al2O31% 4.0%, silicon dioxide SiO2< 5.0%, fluorine CaF20～-1.5%；
Its fusing point is lower than 1150 DEG C；
Its preparation method is: by above-mentioned raw materials through broken, after mix homogeneously, 12000C-15500Melting under C high temperature, fusing reaction generates calcium ferrite；After its cooling, the calcium ferrite of generation is processed into 3～40mm grain block Dephosphorising agent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410765256.1A CN105755198A (en) | 2014-12-15 | 2014-12-15 | Dephosphorizing agent in converter steelmaking and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410765256.1A CN105755198A (en) | 2014-12-15 | 2014-12-15 | Dephosphorizing agent in converter steelmaking and preparation method thereof |
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| CN105755198A true CN105755198A (en) | 2016-07-13 |
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| CN201410765256.1A Pending CN105755198A (en) | 2014-12-15 | 2014-12-15 | Dephosphorizing agent in converter steelmaking and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109972062A (en) * | 2019-04-09 | 2019-07-05 | 舞阳钢铁有限责任公司 | A kind of high-purity large size ESR ingot and its production method |
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2014
- 2014-12-15 CN CN201410765256.1A patent/CN105755198A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109972062A (en) * | 2019-04-09 | 2019-07-05 | 舞阳钢铁有限责任公司 | A kind of high-purity large size ESR ingot and its production method |
| CN109972062B (en) * | 2019-04-09 | 2021-06-18 | 舞阳钢铁有限责任公司 | High-purity large electroslag ingot and production method thereof |
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Application publication date: 20160713 |
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| WD01 | Invention patent application deemed withdrawn after publication |