CN101298633B - Converter slag-containing premelting molten iron pretreatment dephosphorization agent - Google Patents

Converter slag-containing premelting molten iron pretreatment dephosphorization agent Download PDF

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Publication number
CN101298633B
CN101298633B CN2008101501257A CN200810150125A CN101298633B CN 101298633 B CN101298633 B CN 101298633B CN 2008101501257 A CN2008101501257 A CN 2008101501257A CN 200810150125 A CN200810150125 A CN 200810150125A CN 101298633 B CN101298633 B CN 101298633B
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China
Prior art keywords
converter slag
molten iron
premelting
dephosphorizing
agent
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Expired - Fee Related
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CN2008101501257A
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Chinese (zh)
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CN101298633A (en
Inventor
袁守谦
魏颖娟
张西锋
王朝
梁德安
张启业
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Xian University of Architecture and Technology
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Xian University of Architecture and Technology
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00Technologies related to metal processing
    • Y02P10/20Recycling

Abstract

The invention discloses a pre-melted dephosphorizing agent that contains converter slag and is used for preprocessing liquid iron. The produced pre-melted dephosphorizing agent consists of following raw materials and weight percentages thereof: 10 to 60 percent of the converter slag, 15 to 40 percent of activated lime, 15 to 50 percent of iron oxide and 5 to 15 percent of fluorite, and the produced pre-melted dephosphorizing agent is smashed into particles through a complete pre-melting processing at the temperature of 1250 to 1400 DEG C. The pre-melted dephosphorizing agent that contains the converter slag and is used for preprocessing liquid iron of the invention is not easy to absorb moisture, has convenient transportation and storage, low melting point, good fluidness, quick sludging speed, short effective processing time, high phosphorus content and remarkable dephosphorizing effect, and can effectively overcome the influence to the dephosphorizing effect caused by materials of P2O5 and SiO2 and etc. in the converter slag.

Description

A kind of premelting molten iron pretreatment dephosphorization agent that contains converter slag
Technical field
The present invention relates to Dephosphorising agent for melted iron pretreatment in the iron and steel metallurgical industry, relate in particular to that to be used for the molten iron material condition poor, perhaps produce a kind of premelting molten iron pretreatment dephosphorization agent that contains converter slag of low phosphoretic steel, ultra-low phosphoretic steel.
Background technology
Along with the fast development of China's steel industry, converter slag is as the derivative in the process for making flow process, and its output is also unprecedented soaring.The converter quantity of slag is generally 15%~20% of crude steel output; 4.89 hundred million tons of the output of steels of China in 2007; the ratio of converter steel is calculated by 80%; the converter slag annual production is more than 6,000 ten thousand t so; so huge waste residue is if can not obtain good treatment and utilization; it not only causes the significant wastage of resource, and environment protection is caused great pressure and harm.
At present, China's converter slag comprehensive utilization ratio is lower, utilizes level relatively backward, belongs to elementary utilization mostly, is generally used for building the road, produces cement, stemming operation material and return sintering etc., and is remaining still as the refuse abandonment, continues to pile up.Yet fail to give full play to the value of converter slag in above-mentioned application aspect these, and exist serious drawback.This will ask for help work out and can give full play to converter slag and be worth the converter slag utilisation technology can reduce its drawback again to greatest extent.Converter slag is met above requirement substantially as liquid iron pretreatment dephosphorizing agent.The main composition of dephosphorizing agent is calcium oxide, ferric oxide and fluorite, and converter slag mainly is made up of calcium oxide, ferric oxide, silicon oxide etc., the major ingredient that contrasts both finds that their major ingredient is close, thereby can consider to substitute a part of calcium oxide and ferric oxide in the dephosphorizing agent with converter slag.Converter slag can significantly reduce the dephosphorizing agent cost as the part dephosphorizing agent, utilizes metallurgical waste fully, and this had both helped the guard ring border, can make full use of resource again.
At present at calcium be in the synthetic dephosphorizing agent of solid with addition of a certain amount of converter slag carry out liquid iron pretreatment dephosphorizing also the someone carried out certain research, but it just simply synthesizes in the dephosphorizing agent with addition of part powdered converter slag to solid, without any processing, when carrying out liquid iron pretreatment dephosphorizing, there is following shortcoming:
(1) converter slag fusing point height makes with addition of the fusing point height of the synthetic dephosphorizing agent of solid of converter slag, and dephosphorization speed is lower, increases pretreatment time, makes the hot metal temperature drop aggravation;
(2) the synthetic dephosphorizing agent of solid that contains converter slag makes its easy moisture absorption with addition of a large amount of quickened limes, is difficult for storing and transportation;
(3) solid with addition of converter slag synthesizes dephosphorizing agent because globule size difference and component difference of specific gravity easily produce component segregation and unstable properties;
(4) contain a certain amount of P that is unfavorable for that dephosphorisation reaction carries out in the converter slag 2O 5, SiO 2Deng composition, it not only reduces dephosphorization effect, and can occur serious rephosphorization phenomenon under certain condition.
Summary of the invention
At the defective or the deficiency that exist in the above-mentioned existing converter slag utilization, the objective of the invention is to, a kind of useful composition that can fully recycle in the converter slag is provided, realize the resource recycling, and significantly reduce the premelting molten iron pretreatment dephosphorization agent that contains converter slag of liquid iron pretreatment dephosphorizing cost.
In order to realize above-mentioned task, the present invention takes following technical solution:
A kind of premelting molten iron pretreatment dephosphorization agent that contains converter slag is characterized in that, it is characterized in that, preparation before this premelting molten iron pretreatment dephosphorization agent that makes is applicable to and uses is made up of following raw material and weight percent thereof:
Converter slag: 45.73%, calcium oxide: 21.87%, the steel rolling iron scale: 24.78%, fluorite: 7.62%; Or
Converter slag: 33.11%, calcium oxide: 26.87%, the steel rolling iron scale: 31.74%, fluorite: 8.28%; Or
Converter slag: 18.11%, calcium oxide: 32.82%, the steel rolling iron scale: 40.01%, fluorite: 9.06%;
Then each raw material of above-mentioned each prescription is prepared burden by proportion relation, after the sufficient premelt of process under 1250 ℃~1400 ℃ the temperature is handled, be broken into particulate state;
P in the described converter slag 2O 5Content is less than 2.0%, the content of CaO 〉=90% in the quickened lime, the CaF in the fluorite 2Content 〉=88%.
The premelting molten iron pretreatment dephosphorization agent that contains converter slag of the present invention, be suitable for using preceding preparation, each raw material that is about to prescription is prepared burden by proportion relation, in changing slag hearth, be heated under 1250 ℃~1350 ℃ temperature again, be molten into melt cinder, the rapidly cooling of coming out of the stove then is broken into particulate state, make undissolved lime in the converter slag and with addition of quickened lime formed a large amount of low-melting calcium ferrite type compounds (mainly contained 2CaOFe 2O 3, CaO2Fe 2O, CaOFeO 3Deng).And contain a certain amount of CaF in this premelting molten iron pretreatment dephosphorization agent 2, can effectively prevent the SiO in the converter slag 2Form dystectic netted 3CaOSiO on the CaO surface 2, accelerated to contain the change slag speed of the dephosphorizing agent of converter slag.The pre-molten dephosphorizing agent that contains converter slag is simultaneously handled through 1250 ℃~1350 ℃ premelt, substantially formed stable calcium ferrite, it has very strong dephosphorizing capacity, can realize dephosphorization pre-treatment requirement rapidly and efficiently, phosphorus in the molten iron can be reduced to lower level, and the initial phosphorus content fluctuation of molten iron can not produce very big influence to molten dephosphorizing agent dephosphorization effect.
The premelting molten iron pretreatment dephosphorization agent that contains converter slag of the present invention is difficult for the moisture absorption, is convenient to transportation and storage, and fusing point is low, good fluidity, and slagging speed is fast, and effective treatment time is short, the phosphate capacity height, dephosphorization effect is remarkable, and can effectively overcome the P in the converter slag 2O 5And SiO 2Deng the influence of material to dephosphorization effect.
Description of drawings
Fig. 1 is the X diffracting spectrum that contains the fritting liquid iron pretreatment dephosphorizing agent of converter slag 45.73% of the present invention.
The present invention is described in further detail below in conjunction with embodiment that the contriver provides.
Embodiment
The premelting molten iron pretreatment dephosphorization agent that contains converter slag of the present invention, this premelting molten iron pretreatment dephosphorization agent that makes is made up of following raw material and weight percent thereof: converter slag 10%~60%, quickened lime 15%~40%, ferriferous oxide 15%~50%, fluorite 5%~15%; After the sufficient premelt of process under 1250 ℃~1400 ℃ the temperature is handled, be broken into particulate state then.
This premelting molten iron pretreatment dephosphorization agent that contains converter slag is applicable to [Si]≤0.15% molten iron, can add by modes such as winding-up or top add to carry out the dephosphorization of molten iron processing in iron ladle, torpedo tank car or the special-purpose converter.Adopt the premelting molten iron pretreatment dephosphorization agent that contains converter slag of the present invention, has rapid slag function, the dephosphorisation reaction at interior slag of short period-Jin interface just changes liquid-liquid reactions into by solid-liquid reaction behind the adding molten iron surface, has greatly improved the dynamic conditions of dephosphorization.Therefore, these shape and size of premelting molten iron pretreatment dephosphorization agent that contain converter slag are little to dephosphorization effect influence, in actual use, can all can according to small-particle or the powder below the 150 μ m that concrete use processing requirement is broken into 1mm~20mm.
Below be the embodiment that the contriver provides:
Embodiment 1:
In the present embodiment, the content of each composition that contains the premelting molten iron pretreatment dephosphorization agent of converter slag is: converter slag: 45.73%, and calcium oxide: 21.87%, the steel rolling iron scale: 24.78%, fluorite: 7.62%.
Above-mentioned converter slag is the converter slag that general steel-making produces, its P 2O 5Content is less than 2.0%.CaO content 〉=90% in the quickened lime.CaF in the fluorite 2Content 〉=88%.
The premelting molten iron pretreatment dephosphorization agent of present embodiment, be applicable to and use preceding preparation, each raw material that is about to prescription is prepared burden by proportion relation, be heated to 1250 ℃~1350 ℃ again in changing slag hearth and be molten into melt cinder, the cooling rapidly of coming out of the stove then is broken into the small-particle about 3mm then, its dephosphorization effect is: the phosphorus content before molten iron is handled is 0.21%, after the 10min dephosphorization treatment, the phosphorus in the molten iron is reduced to 0.011%, and dephosphorization rate is 94.76%.The X diffracting spectrum that uses this fritting liquid iron pretreatment dephosphorizing agent that contains converter slag 45.73% is referring to Fig. 1.
Embodiment 2:
In the present embodiment, the content of each composition that contains the premelting molten iron pretreatment dephosphorization agent of converter slag is: converter slag: 33.11%, and calcium oxide: 26.87%, the steel rolling iron scale: 31.74%, fluorite: 8.28%; All the other are with embodiment 1.
The premelting molten iron pretreatment dephosphorization agent of present embodiment, be applicable to and use preceding preparation, each raw material that is about to prescription is prepared burden by proportion relation, is heated to 1250 ℃~1350 ℃ again in changing slag hearth and is molten into melt cinder, come out of the stove then and cool off rapidly, be broken into the following powder of 100 μ m.Use the dephosphorization effect of this premelting molten iron pretreatment dephosphorization agent that contains converter slag to be: the phosphorus content before molten iron is handled is 0.21%, and after the 10min dephosphorization treatment, the phosphorus in the molten iron is reduced to 0.018%, and dephosphorization rate is 91.43%.
Embodiment 3:
In the present embodiment, the content of each composition that contains the premelting molten iron pretreatment dephosphorization agent of converter slag is: converter slag: 18.11%, and calcium oxide: 32.82%, the steel rolling iron scale: 40.01%, fluorite: 9.06%, all the other are with embodiment 1.
The premelting molten iron pretreatment dephosphorization agent of present embodiment, be applicable to and use preceding preparation, each raw material that is about to prescription is prepared burden by proportion relation, in changing slag hearth, be heated to 1250 ℃~1350 ℃ again and be molten into melt cinder, come out of the stove then and cool off rapidly, be broken into the following powder of 150 μ m, use this premelting molten iron pretreatment dephosphorization agent dephosphorization effect that contains converter slag to be: the phosphorus content before molten iron is handled is 0.21%, after the 10min dephosphorization treatment, phosphorus in the molten iron is reduced to 0.013%, and dephosphorization rate is 93.81%.
The all right exclusive list of the foregoing description the invention is not restricted to these embodiment, all can reach purpose of the present invention through experiment showed, of applicant at formula range of the present invention.

Claims (1)

1. a premelting molten iron pretreatment dephosphorization agent that contains converter slag is characterized in that, preparation before this premelting molten iron pretreatment dephosphorization agent that makes is applicable to and uses is made up of following raw material and weight percent thereof:
Converter slag: 45.73%, calcium oxide: 21.87%, the steel rolling iron scale: 24.78%, fluorite: 7.62%; Or
Converter slag: 33.11%, calcium oxide: 26.87%, the steel rolling iron scale: 31.74%, fluorite: 8.28%; Or
Converter slag: 18.11%, calcium oxide: 32.82%, the steel rolling iron scale: 40.01%, fluorite: 9.06%;
Then each raw material of above-mentioned each prescription is prepared burden by proportion relation, after the sufficient premelt of process under 1250 ℃~1400 ℃ the temperature is handled, be broken into particulate state;
P in the described converter slag 2O 5Content is less than 2.0%, the content of CaO 〉=90% in the quickened lime, the CaF in the fluorite 2Content 〉=88%.
CN2008101501257A 2008-06-24 2008-06-24 Converter slag-containing premelting molten iron pretreatment dephosphorization agent Expired - Fee Related CN101298633B (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI484042B (en) * 2012-07-12 2015-05-11

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI412600B (en) * 2009-11-06 2013-10-21 China Steel Corp Method of Reducing Phosphorus Content
CN101984088B (en) * 2010-11-16 2012-06-13 东北大学 Method for preparing premelted refining slag by using converter slag and aluminum slag
CN102094100B (en) * 2011-03-18 2012-05-23 武汉钢铁(集团)公司 Molten iron dephosphorizing agent and application method thereof
CN102776310B (en) * 2011-05-09 2014-04-02 中国科学院过程工程研究所 Pretreating dephosphorizing agent for molten iron containing metallic magnesium residues
CN102337373A (en) * 2011-11-07 2012-02-01 秦皇岛首秦金属材料有限公司 Using method for recovering refining slag and recycling in converter
CN109355452A (en) * 2018-10-19 2019-02-19 邯郸钢铁集团有限责任公司 A kind of smelting process of high phosphorus hot metal
CN109764694B (en) * 2019-01-21 2020-10-20 鞍钢实业集团有限公司原燃料生产服务分公司 Intermediate frequency furnace crucible slag settling and removing method for smelting aluminum-based alloy

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI484042B (en) * 2012-07-12 2015-05-11

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