CN101775465A - Dephosphorization agent for converter steelmaking and preparation method thereof - Google Patents
Dephosphorization agent for converter steelmaking and preparation method thereof Download PDFInfo
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- CN101775465A CN101775465A CN200910248967A CN200910248967A CN101775465A CN 101775465 A CN101775465 A CN 101775465A CN 200910248967 A CN200910248967 A CN 200910248967A CN 200910248967 A CN200910248967 A CN 200910248967A CN 101775465 A CN101775465 A CN 101775465A
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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 the field of metallurgical technology, particularly relates to dephosphorization agent for converter steelmaking and a preparation method thereof. The dephosphorization agent is characterized in that the melting point is 1100-1150 DEG C and the dephosphorization agent is formed by the following components by weight percent: 42-44 percent of Fe2O3; 46-48 percent of CaO; 4.0-5.0 percent of Al2O3; 3.5-4.5 percent of SiO2; 0-1.5 percent of CaF2; and 0.5-1.0 percent of K2O+Na2O. The preparation method is that the raw materials are crushed into particles with particle size of 0-10mm, the obtained particles are mixed and are smelted at the temperature of 1200-1550 DEG C, and the obtained product is cooled and crushed into particles and blocks with dimension of 5-40mm. The using method is that 8-10kg dephosphorization agent per ton steel is added during converter steelmaking and the dephosphorization rate can reach 90 percent above. The invention has the advantages that the dephosphorization effect is stable, the consumption is low, the proportion of phosphorus in steel is below 0.01 percent, no fluorine or trace amount of fluorine is contained, the environmental pollution is low and the preservation duration is long.
Description
Technical field
The present invention relates to metallurgical technology field, relate in particular to a kind of dephosphorization agent for converter steelmaking and preparation method thereof.
Background technology
Phosphorus harmful element normally in steel because phosphorous height can make steel produce cold short phenomenon and influences some mechanical propertys of steel in the steel, therefore will be controlled.In the conventional art, the phosphorus general requirement in the steel is controlled at below 0.012% at present, and along with the raising of some steel grade mechanical property requirement standard, the phosphorus in some Clean Steels and the ultra-low phosphoretic steel must be controlled at about 0.005%, or even below 0.003%.For realizing this goal, steel mill adopts " double slag process " mostly, promptly adopts twice slag making in converter smelting; Or " two step method ", forward in another converter after promptly taking a block converter with dephosphorization of molten iron and smelt.All there is the shortcoming that operation is loaded down with trivial details, the treatment time is long in these two kinds of phosphorus removing methods, and the tissue of producing to converter has brought difficulty with cooperating of continuous casting.
Along with the continuous increase of low phosphoretic steel demand, the also corresponding increase of the consumption of dephosphorization material.The existing plurality of specifications of dephosphorizing agent that is used for converter steelmaking at present.Disclosed heterogeneity, composition and preparation method's dephosphorizing agent is also quite a lot in technique known.These dephosphorization materials have in various degree in fact all that fusing point fluctuation is big, fluorine content is higher and the dephosphorization effect instability problem when having certain dephosphorization effect.Wherein Calcium Fluoride (Fluorspan) content is generally between 4.0%～10.%.The environmental requirement of this and increasingly stringent is extremely inharmonious.
Ox is asked " the medium phosphoric iron CaO-Fe that the refined people of grade delivers in the prior art
2O
3-Al
2O
3System and CaO-Fe
2O
3Being the research of flux extra furnace dephosphorization " (" chemical industry metallurgical " 1991, the 12nd phase was rolled up the 4th phase, 290-294 page or leaf) report also uses Cao-Fe
2O
3-Al
2O
3Be flux is handled the medium phosphoric iron amount of phosphorated 0.45% under laboratory condition dephosphorization result, experimental result shows: (1) is for Cao-Fe
2O
3-Al
2O
3Be flux, its consumption is 10% of a pig iron amount; (2) Cao-Fe
2O
3-Al
2O
3Be that flux is at Al
2O
3--Fe
2O
3--1/9 o'clock dephosphorization effect the best is equivalent to Al in the flux
2O
3Content is 5%.Dephosphorization rate is more than 80%, and the terminal point phosphorus concentration can reach below 0.08% in the metal.
Summary of the invention
The purpose of this invention is to provide little, the floride-free or little fluorine in a kind of chemical component fluctuation interval, fusing point is low and stable, that dephosphorization efficient is high dephosphorization agent for converter steelmaking and preparation method thereof.
For solving the problems of the technologies described above, the present invention realizes by the following technical solutions:
A kind of dephosphorization agent for converter steelmaking is characterized in that, its fusing point is 1100 ℃～1150 ℃, is made up of following compositions in weight percentage:
Fe
2O
3???????42％～44％；
CaO?????????46％～48％；
Al
2O
3???????4.0％～5.0％；
SiO
2????????3.5％～4.5％；
CaF
2????????0～1.5％；
K
2O+Na
2O????0.5％～1.0％。
The preparation method of described a kind of dephosphorization agent for converter steelmaking is: it is 0～10mm particle that above-mentioned raw materials is broken into granularity, after mixing, melting under 1200 ℃～1550 ℃ high temperature, the fusing reaction generates calcium ferrite, after treating that it is cooled to normal temperature, be broken into 5～40mm grain piece and get final product.
The using method of described a kind of dephosphorization agent for converter steelmaking is characterized in that, adds the dephosphorizing agent of the present invention of 8～10 kilograms of/ton steel in convertor steelmaking process, and its dephosphorization rate can reach more than 90%.
Compared with prior art, the invention has the beneficial effects as follows: it is stable that the present invention has dephosphorization effect, consume lowly, it can make, and phosphorus element content effectively is controlled at below 0.006% in the steel, and importantly its fluorine content is floride-free or little fluorine environmental pollution is little and the advantage of tool long preservative period.
Embodiment
The present invention will be further described below in conjunction with embodiment:
Embodiment 1
A kind of dephosphorization agent for converter steelmaking, form by following compositions in weight percentage:
Fe
2O
3?43％；CaO?47.5％；Al
2O
3?4.5％；SiO
2?4.0％；K
2O+Na
2O?1.0％。
Its preparation method is that above-mentioned raw materials is broken into granularity is 0～10mm particle, after mixing, melting under 1200 ℃～1550 ℃ high temperature, the fusing reaction generates calcium ferrite, treat that it is cooled to normal temperature after, be broken into 5～40mm grain piece and get final product.Its using method is to add dephosphorizing agent of the present invention in convertor steelmaking process, and add-on is 10.0 kilograms of/ton steel.
Embodiment 2
A kind of dephosphorization agent for converter steelmaking, form by following compositions in weight percentage:
Fe
2O
3?43％；CaO?48％；Al
2O
3?4.0％；SiO
2?3.5％；CaF
2?1.0％；K
2O+Na
2O?0.5％。
Its preparation method is that above-mentioned raw materials is broken into granularity is 0～10mm particle, after mixing, melting under 1200 ℃～1550 ℃ high temperature, the fusing reaction generates calcium ferrite, treat that it is cooled to normal temperature after, be broken into 5～40mm grain piece and get final product.Its using method is to add dephosphorizing agent of the present invention in convertor steelmaking process, and add-on is 8.7 kilograms of/ton steel.
Embodiment 3
A kind of dephosphorization agent for converter steelmaking, form by following compositions in weight percentage:
Fe
2O
3?44.0％；CaO?46.0％；Al
2O
3?5.0％；SiO
2?4.0％CaF
2?0.5％；K
2O+Na
2O?0.5％。
Its preparation method is that above-mentioned raw materials is broken into granularity is 0～10mm particle, after mixing, melting under 1200 ℃～1550 ℃ high temperature, the fusing reaction generates calcium ferrite, treat that it is cooled to normal temperature after, be broken into 5～40mm grain piece and get final product.Its using method is to add dephosphorizing agent of the present invention in convertor steelmaking process, and add-on is 10 kilograms of/ton steel.
Embodiment 4
A kind of dephosphorization agent for converter steelmaking, form by following compositions in weight percentage:
Fe
2O
3?42.0％；CaO?47.0％；Al
2O
3?4.8％；SiO
2?4.5％；CaF
2?0.7％；K
2O+Na
2O?1.0％。Its preparation method is that above-mentioned raw materials is broken into granularity is 0～10mm particle, after mixing, melting under 1200 ℃～1550 ℃ high temperature, the fusing reaction generates calcium ferrite, treat that it is cooled to normal temperature after, be broken into 5～40mm grain piece and get final product.Its using method is to add dephosphorizing agent of the present invention in convertor steelmaking process, and add-on is 8 kilograms of/ton steel.
Embodiment 5
A kind of dephosphorization agent for converter steelmaking, form by following compositions in weight percentage:
Fe
2O
3?42.0％；CaO?48.0％；Al
2O
3?4.0％；SiO
2?4.5％；CaF
2?0.8％；K
2O+Na
2O?0.7％。
Its preparation method is that above-mentioned raw materials is broken into granularity is 0～10mm particle, after mixing, melting under 1200 ℃～1550 ℃ high temperature, the fusing reaction generates calcium ferrite, treat that it is cooled to normal temperature after, be broken into 5～40mm grain piece and get final product.Its using method is to add dephosphorizing agent of the present invention in convertor steelmaking process, and add-on is 9 kilograms of/ton steel.
Embodiment 6
A kind of dephosphorization agent for converter steelmaking, form by following compositions in weight percentage:
Fe
2O
3?42.5％；CaO?47.0％；Al
2O
3?4.5％；SiO
2?3.7％；CaF
2?1.5％；K
2O+Na
2O?0.8％。
Its preparation method is that above-mentioned raw materials is broken into granularity is 0～10mm particle, after mixing, melting under 1200 ℃～1550 ℃ high temperature, the fusing reaction generates calcium ferrite, treat that it is cooled to normal temperature after, be broken into 5～40mm grain piece and get final product.Its using method is to add dephosphorizing agent of the present invention in convertor steelmaking process, and add-on is 9.3 kilograms of/ton steel.
The dephosphorization effect analysis sees the following form:
| Component | Converter molten steel (t) | Dephosphorizing agent add-on (kg) | Original phosphorus content (%) | Phosphorus content in the blow off steel (%) | Dephosphorization rate (%) |
| Embodiment 1 | ??300 | ??3000 | ??0.096 | ??0.009 | ??90.63 |
| Embodiment 2 | ??300 | ??2600 | ??0.078 | ??0.005 | ??93.58 |
| Embodiment 3 | ??300 | ??3000 | ??0.077 | ??0.003 | ??96.08 |
| Embodiment 4 | ??300 | ??2400 | ??0.094 | ??0.008 | ??91.49 |
| Embodiment 5 | ??300 | ??2700 | ??0.075 | ??0.006 | ??92.00 |
| Embodiment 6 | ??300 | ??2800 | ??0.082 | ??0.005 | ??93.90 |
In the foregoing description, the dephosphorizing agent fusing point is 1100 ℃～1150 ℃, CaF
2With K
2O+Na
2O is the impurity component that carries in the raw material.
Claims (3)
1. a dephosphorization agent for converter steelmaking is characterized in that, its fusing point is 1100 ℃～1150 ℃, is made up of following compositions in weight percentage:
Fe
2O
3???????42％～44％；
CaO?????????46％～48％；
Al
2O
3???????4.0％～5.0％；
SiO
2????????3.5％～4.5％；
CaF
2????????0～1.5％；
K
2O+Na
2O????0.5％～1.0％。
2. the preparation method of the described a kind of dephosphorization agent for converter steelmaking of claim 1, it is characterized in that, it is 0～10mm particle that above-mentioned raw materials is broken into granularity, after mixing, melting under 1200 ℃～1550 ℃ high temperature, fusing reaction generates calcium ferrite, treat that it is cooled to normal temperature after, be broken into 5～40mm grain piece and get final product.
3. the using method of the described a kind of dephosphorization agent for converter steelmaking of claim 1 is characterized in that, adds the dephosphorizing agent of the present invention of 8～10 kilograms of/ton steel in convertor steelmaking process, and its dephosphorization rate can reach more than 90%.
Priority Applications (1)
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|---|---|---|---|
| CN200910248967A CN101775465A (en) | 2009-12-31 | 2009-12-31 | Dephosphorization agent for converter steelmaking and preparation method thereof |
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|---|---|---|---|
| CN200910248967A CN101775465A (en) | 2009-12-31 | 2009-12-31 | Dephosphorization agent for converter steelmaking and preparation method thereof |
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|---|---|
| CN101775465A true CN101775465A (en) | 2010-07-14 |
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ID=42512051
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101892352A (en) * | 2010-07-27 | 2010-11-24 | 辽宁天和矿产有限公司 | Arc furnace deep dephosphorization technology and deep dephosphorization agent thereof |
| CN102296152A (en) * | 2011-08-22 | 2011-12-28 | 辽宁天和科技股份有限公司 | Novel converter steelmaking dephosphorization agent and preparation method thereof |
| CN102876843A (en) * | 2012-06-28 | 2013-01-16 | 辽宁天和科技股份有限公司 | Method for producing ultralow phosphoretic steel through carrying out CAS-OB molten steel ladle refining on premelting calcium ferrite |
| CN102876841A (en) * | 2012-06-28 | 2013-01-16 | 辽宁天和科技股份有限公司 | Method for producing ultra-low phosphorus steel in argon blowing station by using premelted calcium ferrite to refine molten steel outdoors |
| CN102888482A (en) * | 2012-06-28 | 2013-01-23 | 辽宁天和科技股份有限公司 | Premelting type slagging and dephosphorizing agent with 2CaO.Fe2O3 and CaO.Fe2O3 serving as main phases |
| CN103443298A (en) * | 2011-03-31 | 2013-12-11 | 新日铁住金株式会社 | Environmentally friendly flux for desulfurization of molten steel |
| CN104593546A (en) * | 2014-09-26 | 2015-05-06 | 洛阳金石再生资源开发有限公司 | Method for preparing premelt calcium ferrite dephosphorization agent |
| WO2017119392A1 (en) * | 2016-01-05 | 2017-07-13 | 新日鐵住金株式会社 | Molten iron dephosphorizing agent, refining agent, and dephosphorization method |
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2009
- 2009-12-31 CN CN200910248967A patent/CN101775465A/en active Pending
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101892352B (en) * | 2010-07-27 | 2011-12-28 | 辽宁中汇环保科技有限公司 | Arc furnace deep dephosphorization technology and deep dephosphorization agent thereof |
| CN101892352A (en) * | 2010-07-27 | 2010-11-24 | 辽宁天和矿产有限公司 | Arc furnace deep dephosphorization technology and deep dephosphorization agent thereof |
| CN103443298B (en) * | 2011-03-31 | 2015-09-09 | 新日铁住金株式会社 | Environmental protection molten steel desulfurizing flux |
| CN103443298A (en) * | 2011-03-31 | 2013-12-11 | 新日铁住金株式会社 | Environmentally friendly flux for desulfurization of molten steel |
| US9127327B2 (en) | 2011-03-31 | 2015-09-08 | Nippon Steel & Sumitomo Metal Corporation | Environmentally friendly flux for molten steel desulfurization |
| CN102296152A (en) * | 2011-08-22 | 2011-12-28 | 辽宁天和科技股份有限公司 | Novel converter steelmaking dephosphorization agent and preparation method thereof |
| CN102876843A (en) * | 2012-06-28 | 2013-01-16 | 辽宁天和科技股份有限公司 | Method for producing ultralow phosphoretic steel through carrying out CAS-OB molten steel ladle refining on premelting calcium ferrite |
| CN102876841A (en) * | 2012-06-28 | 2013-01-16 | 辽宁天和科技股份有限公司 | Method for producing ultra-low phosphorus steel in argon blowing station by using premelted calcium ferrite to refine molten steel outdoors |
| CN102888482A (en) * | 2012-06-28 | 2013-01-23 | 辽宁天和科技股份有限公司 | Premelting type slagging and dephosphorizing agent with 2CaO.Fe2O3 and CaO.Fe2O3 serving as main phases |
| CN104593546A (en) * | 2014-09-26 | 2015-05-06 | 洛阳金石再生资源开发有限公司 | Method for preparing premelt calcium ferrite dephosphorization agent |
| WO2017119392A1 (en) * | 2016-01-05 | 2017-07-13 | 新日鐵住金株式会社 | Molten iron dephosphorizing agent, refining agent, and dephosphorization method |
| KR20180021167A (en) * | 2016-01-05 | 2018-02-28 | 신닛테츠스미킨 카부시키카이샤 | Talline agent, scouring agent and talline method of molten iron |
| CN107849625A (en) * | 2016-01-05 | 2018-03-27 | 新日铁住金株式会社 | Dephosphorising agent, refining agent and the dephosphorization method of molten iron |
| JPWO2017119392A1 (en) * | 2016-01-05 | 2018-04-05 | 新日鐵住金株式会社 | Molten iron dephosphorizing agent, refining agent and dephosphorizing method |
| KR102105353B1 (en) * | 2016-01-05 | 2020-04-29 | 닛폰세이테츠 가부시키가이샤 | Dephosphorization agent, refining agent and dephosphorization method of molten iron |
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Inventor after: Chen Yuntian Inventor before: Chen Yuntian Inventor before: Ma Shide |
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Address after: 114000 Liaoning city of Anshan province Taian County Industrial Park Applicant after: Liaoning Tianhe Technology Co., Ltd. Address before: 114000 Liaoning city of Anshan province Taian County Industrial Park Applicant before: Liaoning Tianhe Minerals Co., Ltd. |
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Open date: 20100714 |