CN1600872A - Dephosphorising agent for converter and preparation method - Google Patents
Dephosphorising agent for converter and preparation method Download PDFInfo
- Publication number
- CN1600872A CN1600872A CN 200410067481 CN200410067481A CN1600872A CN 1600872 A CN1600872 A CN 1600872A CN 200410067481 CN200410067481 CN 200410067481 CN 200410067481 A CN200410067481 A CN 200410067481A CN 1600872 A CN1600872 A CN 1600872A
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- CN
- China
- Prior art keywords
- converter
- phosphorus
- agent
- dephosphorising agent
- steel
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- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
This invention relates to an agent for removing phoshporus content in the steel produced by a convertor, and the prepn. method therefore. The invention convertor steel prodn. phosphorus-removing agent is composed of: iron oxide (Fe2O3), calcium oxide (CaO), aluminium trioxide (Al2O3). The processing procedures are as follows: grniding above-said substance into powder, mixing them evenly, high temp. (1000-1550 deg.C) smelting the mixture to produce calcium aluminoferrite, after cooled, processing it to phosphorus-removing agent with size of 3-50 mm. Advantages are: high phosphorus-removing efficiency, low consumption, long storage period, no fluor, less environmental pollution.
Description
Technical field
The present invention relates to metallurgical technology field, particularly a kind of Dephosphorising agent for converter especially is used for reducing the dephosphorizing agent of molten steel phosphorus content in converter steelmaking is produced.
Background technology
Phosphorus is in the smelting of steel, usually to be controlled as harmful element, because phosphorous height can make steel produce cold short phenomenon in the steel, in order to make under the low-temperature cold condition, cold short phenomenon does not take place in use or working steel products, and the phosphorus in the steel generally should be controlled at below 0.012%.And the phosphorus in clean steel and the ultra-low phosphoretic steel must be controlled at below 0.005%.For reaching this purpose, forward in another converter after steel mill adopts " double slag process " namely to adopt twice slag making or " two step method " namely to take a block converter with dephosphorization of molten iron in converter smelting mostly and smelt.These the two kinds methods that reduce phosphorus, the duration of heat is long, can only have in the situation more than needed in converter smelting production to carry out.Another kind method is that molten iron is carried out pre-treatment, and promptly " three take off " technology station has two kinds: metal mixer car and hot metal ladle.This technology is extensive use of in Japanese iron and steel enterprise, domestic Baoshan Iron and Steel Group etc. at present.But its deficiency be need, investment many with equipment greatly, processing procedure unit consumption height, temperature drop be big.
This area discloses multiple different components, composition and preparation method's dephosphorizing agent.Such as: " the medium phosphoric iron CaO-Fe that the people such as Niu Qiubin deliver
2O
3-Al
2O
3System and CaO-Fe
2O
3The research of series solvent extra furnace dephosphorization " (" chemical industry metallurgical ", 1991, the 12nd the volume the 4th phase, the 290th～294 page) reported and used CaO-Fe
2O
3-Al
2O
3Be flux is processed phosphorous about 0.45% medium phosphoric iron under laboratory condition dephosphorization result, laboratory result shows: (1) is for CaO-Fe
2O
3-Al
2O
3Be flux, its consumption is 10% of 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%, and 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 present invention is in order to overcome above-mentioned deficiency, the invention provides the single slag converter smelting of a kind of employing, fall the Dephosphorising agent for converter of phosphorus control stabilization, can make that phosphorus element content effectively is controlled at below 0.010% in the steel, wherein phosphorus element content effectively is controlled at below 0.005% in the best effect steel.
Technical scheme provided by the invention is a kind of dephosphorizing agent that is used for reducing the iron and steel phosphorus content in converter steelmaking is produced, and this Dephosphorising agent for converter is composed of the following components by weight percentage:
Iron oxide (Fe
2O
3) 51%～70%
Calcium oxide (CaO) 20%～39%
Alchlor (Al
2O
3) 1%～10%
Dephosphorising agent for converter provided by the invention, its preparation method is: with the component of above-mentioned Dephosphorising agent for converter through broken, mix after, through 1000 ℃～1550 ℃ fritting of high temperature, the fusing reaction generates the iron calcium aluminate; Iron calcium aluminate cooling post-treatment becomes the granular Dephosphorising agent for converter of 3～50mm.
In producing, pneumatic steelmaking adds 4～10 kg/tonnes of purposes that can reach dephosphorization.
Advantages such as the present invention has dephosphorization efficient height, long preservative period, unit consumption is low, not fluorine-containing, environmental pollution is little.
The specific embodiment mode
For composition of the present invention, preparation method and implementation result clearly are described, the following example and implementation result are provided, but anything but in order to limit the present invention.
With the component (all being weight percentage) among following arbitrary Dephosphorising agent for converter embodiment, after fragmentation, mixing, through 1000 ℃～1550 ℃ fritting of high temperature, the fusing reaction generates the iron calcium aluminate; Iron calcium aluminate cooling post-treatment becomes the granular Dephosphorising agent for converter of 3～50mm.Also can in technical scheme provided by the invention, choose the material of getting one group of ratio as required wantonly and obtain Dephosphorising agent for converter by manufacture method provided by the invention.
| Component | Iron oxide (Fe 2O 3) | Calcium oxide (CaO) | Alchlor (Al 2O 3) |
| Embodiment one | 51 | 45 | 4 |
| Embodiment two | 60 | 30 | 10 |
| Embodiment three | 70 | 20 | 10 |
| Embodiment four | 69 | 30 | 1 |
| Comparative Examples * | 50 | 48 | 2 |
*: Comparative Examples is " the medium phosphoric iron CaO-Fe that ox asks the refined people of grade to deliver
2O
3-Al
2O
3System and CaO-Fe
2O
3The research of series solvent extra furnace dephosphorization " (chemical industry metallurgical,, the 12nd the 4th phase of volume, 290～294 pages in 1991) report.
Implementation result
For composition of the present invention, preparation method and implementation result clearly are described, the following example and implementation result are provided, but anything but in order to limit the present invention.
| Component | Converter molten steel (ton) | Dephosphorizing agent add-on (kilogram) | Original phosphorus content (%) | Phosphorus content in the blow off steel (%) | Dephosphorization rate (%) |
| Embodiment one | ????300 | ????3000 | ????0.075 | ????0.008 | ????89.3 |
| Embodiment two | ????300 | ????2200 | ????0.079 | ????0.010 | ????87.3 |
| Embodiment three | ????300 | ????3000 | ????0.092 | ????0.004 | ????95.6 |
| Embodiment four | ????300 | ????2500 | ????0.081 | ????0.010 | ????87.6 |
| Comparative Examples * * | ????300 | ????3000 | About 0.45 | ????0.08 | ????82.2 |
*: for CaO-Fe
2O
3-Al
2O
3Be flux, its consumption is 10% of pig iron amount.
Claims (3)
1, the present invention relates to a kind of Dephosphorising agent for converter and preparation method thereof, it is characterized in that, this Dephosphorising agent for converter is composed of the following components by weight percentage:
Iron oxide (Fe
2O
3) 51%～70%
Calcium oxide (CaO) 20%～39%
Alchlor (Al
2O
3) 1%～10%
2, Dephosphorising agent for converter according to claim 1, its preparation method through 1000 ℃～1550 ℃ fritting, generates the iron calcium aluminate for after the component of above-mentioned Dephosphorising agent for converter is pulverized, mixed.
3, the preparation method of Dephosphorising agent for converter according to claim 2 becomes the granular Dephosphorising agent for converter of 3～50mm with generating the iron calcium aluminate cooling post-treatment that obtains.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410067481 CN1600872A (en) | 2004-10-26 | 2004-10-26 | Dephosphorising agent for converter and preparation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410067481 CN1600872A (en) | 2004-10-26 | 2004-10-26 | Dephosphorising agent for converter and preparation method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1600872A true CN1600872A (en) | 2005-03-30 |
Family
ID=34666627
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200410067481 Pending CN1600872A (en) | 2004-10-26 | 2004-10-26 | Dephosphorising agent for converter and preparation method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1600872A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102153144A (en) * | 2010-02-11 | 2011-08-17 | 同济大学 | Method for preparing calcium ferroaluminates |
| CN102296153A (en) * | 2011-08-22 | 2011-12-28 | 辽宁天和科技股份有限公司 | Novel premelting dephosphorization agent for steel making and preparation method 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 |
| CN102897843A (en) * | 2012-09-24 | 2013-01-30 | 同济大学 | Method for synthesis of tetracalcium aluminoferrite by sol-gel technology |
| CN105013435A (en) * | 2015-06-23 | 2015-11-04 | 西安建筑科技大学 | Composite metal oxide phosphorous removal adsorbent and preparation method thereof |
| 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 |
| CN114622052A (en) * | 2022-03-21 | 2022-06-14 | 北京科技大学 | Molten iron dephosphorization agent, preparation method thereof and molten iron dephosphorization method |
-
2004
- 2004-10-26 CN CN 200410067481 patent/CN1600872A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102153144A (en) * | 2010-02-11 | 2011-08-17 | 同济大学 | Method for preparing calcium ferroaluminates |
| CN102153144B (en) * | 2010-02-11 | 2013-02-13 | 同济大学 | Method for preparing calcium ferroaluminates |
| CN102296153A (en) * | 2011-08-22 | 2011-12-28 | 辽宁天和科技股份有限公司 | Novel premelting dephosphorization agent for steel making and preparation method 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 |
| CN102897843A (en) * | 2012-09-24 | 2013-01-30 | 同济大学 | Method for synthesis of tetracalcium aluminoferrite by sol-gel technology |
| CN105013435A (en) * | 2015-06-23 | 2015-11-04 | 西安建筑科技大学 | Composite metal oxide phosphorous removal adsorbent and preparation method thereof |
| 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 |
| CN114622052A (en) * | 2022-03-21 | 2022-06-14 | 北京科技大学 | Molten iron dephosphorization agent, preparation method thereof and molten iron dephosphorization method |
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|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |