CN102146500A - Fluxing agent for smelting steel as well as preparation and use methods thereof - Google Patents

Fluxing agent for smelting steel as well as preparation and use methods thereof Download PDF

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Publication number
CN102146500A
CN102146500A CN2010101100668A CN201010110066A CN102146500A CN 102146500 A CN102146500 A CN 102146500A CN 2010101100668 A CN2010101100668 A CN 2010101100668A CN 201010110066 A CN201010110066 A CN 201010110066A CN 102146500 A CN102146500 A CN 102146500A
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CN
China
Prior art keywords
cao
fluxing agent
lime
steel
iron
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Pending
Application number
CN2010101100668A
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Chinese (zh)
Inventor
曹东
李德刚
廖相巍
赵刚
万雪峰
贾吉祥
温铁光
王鹏
马成
张晓军
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Angang Steel Co Ltd
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Angang Steel Co Ltd
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Publication date
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Priority to CN2010101100668A priority Critical patent/CN102146500A/en
Publication of CN102146500A publication Critical patent/CN102146500A/en
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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 fluxing agent for smelting steel as well as preparation and use methods thereof. The fluxing agent comprises the following components by weight percent: 70%-90% of 4CaO 7Fe2O3, 5%-20% of CaO Fe2O3, 1%-5% of SiO2, 0-3% of Al2O3, 0-3% of MgO and 0-5% of impurities. The preparation method comprises the following steps: evenly mixing an iron-containing waste material and a CaO-containing lime material in a ratio of ferric oxide to calcium oxide of 55%-75% to 25%-45%; pressing to form a sphere-shaped mixture with a diameter of phi 30-60mm; putting the sphere-shaped mixture in a cupola furnace for smelting, wherein the smelting temperature is controlled to 1200-1300 DEG C; in the smelting process, discharging a premelting material once per 8-12 minutes, and crushing the cooled premelting material in to blocks with a diameter of 40 mm below. The fluxing agent is used in a converter and a finery, and the addition amount of the fluxing agent is 0.3%-0.5% of loading amount of metals; and the fluxing agent is added once along with the first batch of slagging materials or is added along with the slagging materials in batch. The fluxing agent has the advantages of low melting point and good continuous slagging effect, can be used for alleviating corrosion on furnace lining and improving quality of molten steel, is beneficial to environment conservation, and the like.

Description

Flux in steel making agent and preparation thereof and using method
Technical field
The invention belongs to steelmaking technical field, refer in particular to a kind of flux in steel making agent, promptly mineral composition is with 4CaO7Fe 2O 3Be main flux in steel making agent and preparation method thereof and using method.
Background technology
In order to guarantee that the initial stage slag early changes, dephosphorization, desulfurization and blowing operation can be carried out smoothly in convertor steelmaking process, need to add a certain amount of fusing assistant, at present, the fusing assistant that adopts in the production mainly contains following several:
1. with CaF 2For what mainly form: fluorite is a kind of slag making dissolving agent that generally uses, the main component CaF of fluorite 2, the low fusing point that also can significantly reduce CaO of its fusing point, but because fluorite discharges deleterious (F in steelmaking process -1) element, cause environmental pollution, therefore, fluorite is as the fusing assistant use that has been under an embargo.
2. with Al 2O 3For what mainly form: vanadine class (red bauxite, bauxitic clay and alumina are main raw material) fusing assistant, Chinese patent (patent No. 99113322.6) discloses a kind of with Al 2O 3Be the main alumina class fusing assistant of forming, it consists of: Al 2O 3〉=45%, SiO 2≤ 30%, Fe 2O 3: 7%~8%, surplus is CaO, MgO, TiO 2, impurity such as P, S, granularity is 5~30mm, usage quantity is 1.6~9kg/ ton steel, the vanadine class thinner slag effect of fluxing is comparatively stable, but Al 2O 3Form 3CaOAl with the CaO in the lime 2O 3And 12CaO7Al 2O 3, its fusing point is higher to be respectively 1535 ℃ and 1455 ℃, though vanadine class fusing assistant can playing slag fluxing action, because higherization of fusing point slag effect is not ideal enough.
3. it with FeO main the composition: iron Phosphorus (iron scale, iron ore and iron scale are main raw material) fusing assistant, it is the main iron scale class dissolving agent of forming with FeO that Chinese patent (patent No. 99112573.8) discloses a kind of, it consists of: iron scale 70%~90%, ironmaking mud 5%~25%, binding agent 1%~5%, with raw material pulverizing, configuration, mixing and suppress balling-up, the iron scale class thinner slag effect of fluxing is comparatively remarkable.But it mainly consists of FeO and Fe 2O 3With CaO reaction needed absorption portion heat in the lime, make the molten bath temperature drop bigger; While FeO and Fe 2O 3Penetrating power the strongest, can destroy 2CaOSiO rapidly 2Shell, it is very fast to change slag speed, but action time is short, and ensured sustained development slag effect is bad, and to problems such as lining erosion are comparatively serious.
Above-mentioned fusing assistant exists contaminate environment; Fusing point is higher, change slag effect is undesirable; Make problems such as the molten steel temperature drop is big, action time short, ensured sustained development slag effect is bad.
Summary of the invention
Technical problem at existing flux in steel making agent exists provides a kind of environmental protection that is beneficial to; Fusing point is low, the ensured sustained development slag is effective; Can alleviate fusing assistant and preparation and using method to lining erosion, raising steel quality.
In order to achieve the above object, the present invention adopts following technical scheme:
The lime class material that the present invention adopts the steel-making iron-containing waste and contains CaO is prepared by following quality proportioning, through the smelting furnace fritting, be prepared from after fragmentation.Wherein, the ferric oxide (Fe in the iron-containing waste 2O 3) and to contain the proportioning of the calcium oxide (CaO) in the CaO lime class material as follows:
Ferric oxide (Fe 2O 3) 55%~75%
Calcium oxide (CaO) 25%~45%
Described steel-making iron-containing waste mainly comprises one or more the mixing in the heavy mud of steel rolling iron phosphorus, iron content, the converter dust-removing ash; The lime class material of the described CaO of containing mainly comprises one or more the mixing in lime screen underflow, Wingdale, unslaked lime, the slaked lime.
For guaranteeing that preparation raw material mixes, make the fusing assistant composition after the fritting even, the raw materials used granularity of the present invention is advisable according to following requirement: iron-containing waste 0~10mm, contain lime class material 0~10mm of CaO.
Preparation method of the present invention: with described iron-containing waste and contain the lime class material of CaO by preparing with the proportioning of improving quality, being pressed into diameter after raw material mixed is Φ 30~60mm ball-type, putting into the cupola furnace melts, temperature of fusion is controlled at 1200~1300 ℃, per 8~12min in the melting process, the once pre-fusant of discharging is treated to be broken into the following bulk of 40mm after the pre-fusant cooling.
Its mineral composition of fusing assistant of adopting above-mentioned prepared is with 4CaO7Fe 2O 3Be main, it is composed as follows:
4CaO·7Fe 2O 3 70%~90%
CaO·Fe 2O 3 35%~20%
SiO 2 1%~5%
Al 2O 3 0~3%
MgO 0~3%
Impurity 0~5%
Using method: the fusing assistant of the present invention's preparation can use in converter and refining furnace, and its add-on is 0.3%~0.5% of a metal Intake Quantity; Can once add or add in batches with first slag making materials when being used for converter, once add with slag making materials when being used for refining furnace with slag making materials.
1. preparation method of the present invention has originality: be at research CaO-Fe 2O 3Be to create on the basis of solid-liquid phase transformation of mineral, find after deliberation: the fusing point of CaO is 2600 ℃, Fe 2O 3Fusing point be 1600 ℃, but to synthesize CaO-Fe 2O 3The mineral of system, its fusing point can significantly reduce.The mineral (ore deposit phase) that belong to this scope have CaOFe 2O 3, 2CaOFe 2O 3, 4CaO7Fe 2O 3
2. the present invention explores in the research of best proportioning, and createing with composition benchmark best in quality proportioning is 25%~45% couple of Fe of CaO 2O 355%~75%,, when fusing for 1200~1300 ℃, can guarantee to generate in cupola furnace inner control temperature with 4CaO7Fe 2O 3Be the fusing assistant that essential mineral is formed, its fusing point is at CaO-Fe 2O 3Minimum in the mineral of system.
3. the analysis for mineral is difficult to determine with common chemical process, has only the method for X-ray diffraction analysis just possible, and Fig. 1 is the X-ray diffractogram of product of the present invention: in the accompanying drawing: ■ represents 4CaO7Fe 2O 3, ▲ expression CaOFe 2O 3, from accompanying drawing as can be seen under preparation method's condition of the present invention, most of city 4CaO7Fe2O3 mineral of giving birth to.
4. preparation method of the present invention has the selection sufficient raw, does not need specific installation, and production technique is simple, advantages such as easy control.
5. the product of preparation method's manufacturing of the present invention has the dual-use function of steel-making fusing assistant and dephosphorizing agent concurrently, owing to shortened the steel-making time, reach the purpose of save energy, improved steel-making efficient, realize that not increasing equipment just can increase output of steel, simultaneously, owing to the effect that has dephosphorization concurrently improves the quality of steel, be ideal steel-making fusing assistant and dephosphorizing agent.
Description of drawings
Fig. 1 is the X-ray diffractogram of product of the present invention.
Embodiment
For further describing the present invention, below in conjunction with embodiment, by the comparison production test, the present invention will be described in more detail.
Selecting granularity is unslaked lime screen underflow and the iron phosphorus powder of 0~10mm, prepare 5000kg by composition Reference mass proportioning table 1, formulation is mixed, simultaneously mixture 5000kg is pressed into diameter and is the ball-type about Φ 50mm, subsequently forming composition is put into the cupola furnace melting, the temperature of fusion band is controlled at 1200~1300 ℃, liquefactent of discharging in per about 10 minutes, and resultant is about 4000kg.With the bulk that is broken into after the resultant cooling below the 40mm, as flux in steel making agent and dephosphorizing agent.The composition and the fusing point of fusing assistant of the present invention are seen respectively: table 2, table 3.
Table 1: embodiment quality proportioning table
Annotate: lime CaO content is 80%, iron phosphorus Fe 2O 3Content is 90%
The present invention is when the agent of preparation flux in steel making, remove iron-containing waste and select the iron phosphorus powder for use, the above-mentioned unslaked lime screen underflow of lime class material selection of CaO is done outside the raw material, and iron-containing waste also can be selected one or more the mixing in the heavy mud of steel rolling iron phosphorus, iron content, the converter dust-removing ash for use; The lime class material that contains CaO also can be selected one or more the mixing in lime screen underflow, Wingdale, unslaked lime, the slaked lime for use, and granularity is 0~10mm.
Table 2: fusing assistant is formed (Wt%)
Scheme 4CaO·7Fe 2O 3 CaO·Fe 2O 3 SiO 2 Al 2O 3 MgO Impurity
Scheme 1 90 5 1.64 0.60 0.83 1.93
Scheme 2 80 12 2.04 0.82 1.20 3.94
Scheme 3 70 20 2.56 1.05 1.82 4.57
Table 3: fusing assistant fusing point
Scheme Softening temperature (℃) The hemisphere point (℃) Yield point (℃)
Scheme 1 1217 1219 1230
Scheme 2 1226 1238 1249
Scheme 3 1243 1256 1268
Adopt fusing assistant of the present invention, on 260 tons of top and bottom combined blown converters, carry out the comparison production test, its result of use: see Table 4.
Table 4: fusing assistant result of use
Wherein embodiment 1 once adds with slag making materials, and add-on is 0.4% of a metal Intake Quantity; Embodiment 2 adds 0.3% with first slag making materials, adds 0.1% with second batch of slag making materials; Embodiment 3 adds 0.2% with first slag making materials, adds 0.2% with second batch of slag making materials.
From the comparison production test effect as can be seen:
1. the product of the present invention's preparation can satisfy the flux effect and the dephosphorization effect of steel-making simultaneously;
2. this product is not fluorine-containing is beneficial to environmental protection, and fusing point is lower simultaneously, being beneficial to slag; Because mineral composition is mainly 4CaO7Fe 2O 3Composite minerals, long action time, the ensured sustained development slag is effective, and is light to lining erosion simultaneously; Owing to handle, therefore, add the splash of fashionable difficult generation metal and the molten bath temperature drop is little through fritting;
3. when steel-making adds product of the present invention and can shorten smelting cycle 1~4min than adding staple, but save energy under the situation that does not increase facility investment, improves production capacity simultaneously.
4. add product of the present invention when making steel, can reduce the converter terminal phosphorus content, improve the converter dephosphorization rate, thereby improve the quality of steel.

Claims (4)

1. flux in steel making agent is characterized in that the mass percent of flux components is:
4CaO·7Fe 2O 3 70%~90%
CaO·Fe 2O 3 5%~20%
SiO 2 1%~5%
Al 2O 3 0~3%
MgO 0~3%
Impurity 0~5%.
2. a preparation method who is used for the described flux in steel making agent of claim 1 is characterized in that, iron-containing waste and the lime class material that contains CaO are prepared by following quality proportioning:
Ferric oxide (Fe 2O 3) 55%~75%
Calcium oxide (CaO) 25%~45%
It is Φ 30~60mm ball-type that the raw material of preparation according to the above ratio is pressed into diameter after mixing, put into the cupola furnace and melt, temperature of fusion is controlled at 1200~1300 ℃, per 8~12min in the melting process, the once pre-fusant of discharging is treated to be broken into the following bulk of 40mm after the pre-fusant cooling.
3. the preparation method of flux in steel making agent according to claim 2 is characterized in that, described iron-containing waste mainly comprises one or more the mixing in the heavy mud of steel rolling iron phosphorus, iron content, the converter dust-removing ash; The lime class material of the described CaO of containing mainly comprises one or more the mixing in lime screen underflow, Wingdale, unslaked lime, the slaked lime, and granularity is 0~10mm.
4. a using method that is used for the described flux in steel making agent of claim 1 is characterized in that, fusing assistant uses in converter and refining furnace, and its add-on is 0.3%~0.5% of a metal Intake Quantity; Once add or add in batches with first slag making materials with slag making materials.
CN2010101100668A 2010-02-08 2010-02-08 Fluxing agent for smelting steel as well as preparation and use methods thereof Pending CN102146500A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102787203A (en) * 2012-08-08 2012-11-21 江苏大学 Fluoride-free slag-making fluxing agent for converter steel making
CN102943146A (en) * 2012-10-30 2013-02-27 沈阳东北大学冶金技术研究所有限公司 Steel smelting slagging method, steel smelting method and slagging material
CN103509910A (en) * 2012-06-20 2014-01-15 鞍钢股份有限公司 Molten steel refining fluxing agent and its making method
CN103993134A (en) * 2014-06-14 2014-08-20 钢铁研究总院 Steelmaking slag melting agent and use method thereof
CN106916942A (en) * 2017-04-19 2017-07-04 王冰 A kind of processing method of smelting iron and steel slag making

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001073021A (en) * 1999-08-31 2001-03-21 Nisshin Steel Co Ltd Flux for refining metal and production thereof
CN1333381A (en) * 2000-07-06 2002-01-30 伍发贵 Composite slag melting agent for steelmaking
CN1374407A (en) * 2001-03-14 2002-10-16 张梦显 Fe-Ca-Al slag and its prepn
CN101082072A (en) * 2006-05-31 2007-12-05 阳泉市太行电熔镁有限公司 New melting agent for steelmaking furnace slag

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001073021A (en) * 1999-08-31 2001-03-21 Nisshin Steel Co Ltd Flux for refining metal and production thereof
CN1333381A (en) * 2000-07-06 2002-01-30 伍发贵 Composite slag melting agent for steelmaking
CN1374407A (en) * 2001-03-14 2002-10-16 张梦显 Fe-Ca-Al slag and its prepn
CN101082072A (en) * 2006-05-31 2007-12-05 阳泉市太行电熔镁有限公司 New melting agent for steelmaking furnace slag

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103509910B (en) * 2012-06-20 2015-11-18 鞍钢股份有限公司 A kind of liquid steel refining fluxing agent and manufacture method thereof
CN103509910A (en) * 2012-06-20 2014-01-15 鞍钢股份有限公司 Molten steel refining fluxing agent and its making method
CN102787203B (en) * 2012-08-08 2015-06-10 江苏大学 Fluoride-free slag-making fluxing agent for converter steel making
CN102787203A (en) * 2012-08-08 2012-11-21 江苏大学 Fluoride-free slag-making fluxing agent for converter steel making
CN102943146A (en) * 2012-10-30 2013-02-27 沈阳东北大学冶金技术研究所有限公司 Steel smelting slagging method, steel smelting method and slagging material
CN102943146B (en) * 2012-10-30 2015-07-29 沈阳东北大学冶金技术研究所有限公司 A kind of smelting iron and steel slagging method, iron and steel smelting process and slag making materials
CN103993134A (en) * 2014-06-14 2014-08-20 钢铁研究总院 Steelmaking slag melting agent and use method thereof
CN106916942A (en) * 2017-04-19 2017-07-04 王冰 A kind of processing method of smelting iron and steel slag making

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