CN107002154A - The preprocess method of iron liquid - Google Patents

The preprocess method of iron liquid Download PDF

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Publication number
CN107002154A
CN107002154A CN201580068170.6A CN201580068170A CN107002154A CN 107002154 A CN107002154 A CN 107002154A CN 201580068170 A CN201580068170 A CN 201580068170A CN 107002154 A CN107002154 A CN 107002154A
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China
Prior art keywords
clinker
iron liquid
dephosphorization
desiliconization
stove
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CN201580068170.6A
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Chinese (zh)
Inventor
前田孝彦
川畑凉
田中高太郎
百崎和人
石毛俊朗
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JFE Steel Corp
JFE Engineering Corp
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NKK Corp
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Priority to CN202210608276.2A priority Critical patent/CN115074489A/en
Publication of CN107002154A publication Critical patent/CN107002154A/en
Pending legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C1/00—Refining of pig-iron; Cast iron
    • C21C1/02—Dephosphorising or desulfurising
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C1/00—Refining of pig-iron; Cast iron
    • C21C1/04—Removing impurities other than carbon, phosphorus or sulfur
    • Y—GENERAL 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)

Abstract

A kind of preprocess method of iron liquid, desiliconization processing and the dephosphorization treatment from the iron liquid of blast furnace casting are carried out continuously using 1 converter type refining furnace, wherein, even if being difficult to accurately hold the quality of the clinker residued in stove, the situation of composition, desiliconization processing and dephosphorization treatment are also efficiently carried out.Following process is carried out successively using 1 converter type refining furnace (1) to pre-process iron liquid：The desiliconization treatment process of iron liquid (5)；The middle deslagging process that the desiliconization clinker (6) generated in desiliconization treatment process is discharged；The dephosphorization treatment process of dephosphorization treatment is carried out to residuing in the iron liquid in refining furnace (5A)；The process of coming out of the stove that iron liquid (5B) through dephosphorization treatment is come out of the stove, now, after process of coming out of the stove, decide whether that the dephosphorization clinker (7) that will be generated in dephosphorization treatment process is discharged to outside stove based on the Analysis of phosphorus contents value of the iron liquid (5B) after the dephosphorization treatment of this charging, then, by next time, the iron liquid of charging is encased in above-mentioned refining furnace, carries out above-mentioned pretreatment.

Description

The preprocess method of iron liquid
Technical field
The present invention relates to a kind of iron liquid using converter type refining furnace (converter-type refining furnace) Preprocess method, specifically, be related to it is a kind of be used for it is high to being carried out from the iron liquid of blast furnace casting using 1 converter type refining furnace The desiliconization processing of effect and pretreatment (pretreatment) method of dephosphorization treatment.
Background technology
In recent years, the exploitation of the preprocess method (desiliconization processing, dephosphorization treatment, desulfurization process) of iron liquid is carried out always, is made For as a result, being loaded into (charge) to the iron liquid in steel-making pure oxygen converter (oxygen steelmaking converter) Phosphorus (P), the concentration of sulphur (S) is reduced to and need not mainly be completed with pure oxygen converter in steel-making except the level that goes to more than them Only carry out the steel-making refinery practice of Decarburising and refining.In desiliconization processing and dephosphorization treatment, the silicon (Si) or phosphorus quilt in iron liquid are carried out The reaction (oxidation reaction) that the oxygen supplied into the oxygen source (oxygen, iron oxide) of iron liquid is aoxidized and removed.On the other hand, de- In sulphuring treatment, the desulfurizing agents such as CaO (calcium oxide) are carried out with the reaction of Salmon-Saxl in iron liquid except the reaction (reduction reaction) of desulfuration.
In the pretreatment of these iron liquids, dephosphorization treatment makes the phosphorous oxides (P of generation2O5) absorb and enter in CaO systems clinker Row dephosphorisation reaction.From the viewpoint of dephosphorization balance, the basicity of the clinker for absorbing phosphorous oxides (=(quality %CaO)/ (quality %SiO2)；Hereinafter, also it is abbreviated as " basicity ") need to control as in the range of setting, such as 1.5~3.0.
Silicon in iron liquid is oxidized prior to the phosphorus in iron liquid, even if therefore in order to implement dephosphorization treatment to iron liquid and to containing There is the iron liquid supply oxygen source of silicon, desilication reaction also occurs first, after tailing off dephosphorisation reaction occurs for the silicon in iron liquid.Silicon is aoxidized Shi Bianwei SiO2When silicon concentration in (silica), therefore iron liquid before dephosphorization treatment is high, the SiO in dephosphorization treatment2Production Raw quantitative change is more.As a result, being applied not only to ensure the basicity of clinker the CaO series solvents (CaO-based flux) of defined value Use quantitative change it is many, the yield of clinker also becomes many, processing cost is increased.
Therefore, various schemes are proposed in order to solve the above problems.For example, in patent document 1, using 1 converter When type refining furnace implements desiliconization processing and the dephosphorization treatment of iron liquid, generated in previous charging (previous heat) is not discharged Dephosphorization clinker (slag discharging) in the case of, by next time feed (subsequent heat) iron liquid be encased in In converter type refining furnace.And, it is proposed that following preprocess method：Desiliconization processing is implemented to the iron liquid, the silicon in iron liquid is dense At the time of degree is changed into below 0.2 mass %, at least a portion by basicity for clinker in the stove of 1.0~3.0 scope is discharged, and is connect , carry out dephosphorization treatment.Here, " dephosphorization clinker " refers to the clinker generated in dephosphorization treatment.In addition, " charging " (heat) is 1 unit will be used as untill discharging iron liquid or molten steel from the refining being fitted into after new iron liquid in the stove is terminated and from stove Concept, is also contained in stove in being fed at 1 time and keeps the state interval of iron liquid to have the multiple refining of the progress such as interruption.
In addition, in patent document 2, when implementing desiliconization processing and dephosphorization treatment using 1 converter type refining furnace, not discharging The dephosphorization clinker that is generated in previous charging and the iron liquid of charging next time is encased in converter type refining furnace, de- is implemented to the iron liquid Silicon processing.And, it is proposed that following preprocess method：The silicon concentration of iron liquid at the end of being handled using desiliconization as 0.2 mass % with Under, the basicity of slag after desiliconization processing be that bonded hard ferrite magnet after 0.5~1.5, desiliconization processing is that 1240~1400 DEG C of mode is entered Row control, then, more than the 40 mass % of the clinker after discharge desiliconization processing thereafter, dephosphorization refining are carried out to the iron liquid in stove.
What is proposed by applying in patent document 1 or patent document 2 does not discharge the dephosphorization clinker generated in previous charging And the basicity for being used for clinker in the desiliconization processing of charging next time adjusts the technology of purposes, so as to obtain that recycling can be reduced The usage amount of new CaO series solvents beyond clinker, while the effect of clinker yield can be reduced.In addition, utilizing patent text The technology proposed in 2 is offered, makes the basicity of slag reduction after desiliconization processing, and reduce bonded hard ferrite magnet.Thereby, it is possible to suppress from Rephosphorization (rephosphorization) from clinker to iron liquid, and then while can reduce the usage amount of CaO series solvents reduce exist Discharge the metal ferrous components being mixed into clinker and improve iron yield rate.Here, " rephosphorization " refers to the phosphorous oxides contained in clinker (P2O5) decompose, phosphorus is transferred to iron liquid and phenomenon that the phosphorus concentration of iron liquid rises.
Prior art literature
Patent document
Patent document 1：Japanese Unexamined Patent Publication 11-323420 publications
Patent document 2：Japanese Unexamined Patent Publication 2013-167015 publications
The content of the invention
However, above-mentioned have problems with the prior art.
Patent document 1 and patent document 2 must utilize what is generated in dephosphorization treatment in the desiliconization processing of charging next time After dephosphorization clinker, the clinker discharge in stove (is referred to as " middle deslagging " in the midway of desiliconization processing and dephosphorization treatment (intermediate slag discharging)).If however, when the basicity of dephosphorization clinker is low, what is fed in next time is de- Dephosphorization clinker is utilized in silicon processing, then because of the SiO generated in desiliconization processing2And make by the SiO2With the dephosphorization remained in stove The basicity of the desiliconization clinker of clinker generation is further reduced.As a result, so-called " rephosphorization " occurs sometimes, i.e., in desiliconization processing, Phosphorous oxides (the P contained in dephosphorization clinker2O5) decompose, phosphorus is transferred to iron liquid.Here, " desiliconization clinker " refers to handle in desiliconization The clinker of middle generation.
In addition, the discharge rate of the clinker in middle deslagging can be not necessarily controlled as expected sometimes. In this case, the deviation of the slag amount remained in stove becomes big.Especially for the discharge of the clinker in middle deslagging, if Obtain larger deslagging speed or to reduce residual in stove in the case where clinker foamed (slag foaming) is insufficient The quantity of slag and the angle excursion for increasing converter type refining furnace, then iron liquid also can be together with clinker from fire door (throat of Furnace) discharge to a certain degree.In this case, the discharge rate of iron liquid and non-constant, even if therefore in the middle of determining in deslagging The quality of effluent in stove, the quality of the clinker in determined discharge rate can not be also accurately held immediately.Therefore, in Between the composition of clinker of dephosphorization treatment after deslagging, the control of amount there is uncertain factor so that in the presence of unexpectedly basicity Reduction or the situation of slag amount increase.If not discharging the dephosphorization clinker generated in such dephosphorization treatment in charging next time Utilized in desiliconization processing, then produce the clinker in refining and sprayed from fire door, have no alternative but interrupt deslagging when refining or middle deslagging The productivity ratio that time increases and pre-processed is the problem of reduce, that is, the problem of implementing the ratio of pretreatment and reduce.
In other words, according to operating condition, fed sometimes because the dephosphorization clinker of previous charging is not discharged in next time Utilized in desiliconization processing and hinder operation on the contrary.
Patent document 1 and patent document 2 do not carry out any consideration to these problems.
The present invention is to carry out in view of the foregoing, and the purpose is to provide a kind of preprocess method of iron liquid, it uses 1 Continuous (in succession) is carried out at the desiliconization processing of the iron liquid of blast furnace casting and dephosphorization individual converter type refining furnace successively Reason, wherein, remained in even if being difficult to accurately hold in the pre-treatment job for the iron liquid being carried out continuously in repeatedly feeding in stove Quality, the situation of composition of clinker, also can implement optimal preprocess method corresponding with situation to iron liquid, suppress what is recycled The usage amount and clinker discharge rate of new CaO series solvents beyond clinker, carry out efficient desiliconization processing and dephosphorization treatment.
Idea of the invention for solving above-mentioned problem is as follows.
[1] a kind of preprocess method of iron liquid, it is characterised in that carry out following work successively using 1 converter type refining furnace Ordered pair iron liquid is pre-processed：Desiliconization treatment process, to carrying out desiliconization processing from the iron liquid of blast furnace casting；Middle deslagging process, So that the iron liquid handled through desiliconization remains in the desiliconization that the state in above-mentioned refining furnace will be generated in above-mentioned desiliconization treatment process At least a portion of clinker is discharged from above-mentioned refining furnace；Dephosphorization treatment process, to being remained in the middle deslagging process (retain) iron liquid in above-mentioned refining furnace carries out dephosphorization treatment；With process of coming out of the stove, by the iron liquid through dephosphorization treatment from above-mentioned Refining furnace is come out of the stove (tap), now, after above-mentioned process of coming out of the stove, the phosphorus content of the iron liquid after the dephosphorization treatment based on this charging Assay value decides whether that the dephosphorization clinker in the above-mentioned refining furnace that will be generated in above-mentioned dephosphorization treatment process is discharged to outside stove, Determine discharge dephosphorization clinker from above-mentioned refining furnace during discharge dephosphorization clinker, not from above-mentioned essence when determining not discharging dephosphorization clinker Dephosphorization clinker is discharged in furnace, then, the iron liquid of charging is encased in above-mentioned refining furnace by next time, carries out above-mentioned pretreatment.
[2] preprocess method of the iron liquid according to above-mentioned [1], it is characterised in that the iron liquid after above-mentioned dephosphorization treatment Analysis of phosphorus contents value for certain below setting Z in the range of the mass % of 0.030 mass %~0.060 when, not from above-mentioned essence When the Analysis of phosphorus contents value that the iron liquid after above-mentioned dephosphorization clinker, above-mentioned dephosphorization treatment is discharged in furnace exceedes above-mentioned setting Z, from Above-mentioned dephosphorization clinker is discharged in above-mentioned refining furnace.
[3] preprocess method of the iron liquid according to above-mentioned [1] or [2], it is characterised in that above-mentioned middle deslagging process The residual quantity of above-mentioned desiliconization clinker in above-mentioned refining furnace afterwards is below 25kg/ tons of iron liquids.
[4] preprocess method of the iron liquid according to any one of above-mentioned [1]~[3], it is characterised in that above-mentioned desiliconization The silicone content of iron liquid before treatment process is below 0.70 mass %.
According to the present invention, being carried out continuously using 1 converter type refining furnace from the desiliconization processing of the iron liquid of blast furnace casting and In the preprocess method of the iron liquid of dephosphorization treatment, decided whether based on the Analysis of phosphorus contents value of the iron liquid after dephosphorization treatment process Dephosphorization clinker in stove is discharged to outside stove, even if therefore being difficult to accurately hold the pre- of the iron liquid that is carried out continuously in multiple charging Quality, the situation of composition of the clinker remained in processing operation in stove, can also be realized corresponding with situation most to iron liquid implementation The usage amount of new CaO series solvents beyond the clinker that good preprocess method, suppression are recycled, efficient desiliconization is carried out to iron liquid Processing and efficient dephosphorization treatment.
Brief description of the drawings
Fig. 1 is the longitudinal section signal of the converter type refining furnace used when implementing the preprocess method of iron liquid of the present invention Figure.
Fig. 2 is to represent the preprocess method of the iron liquid of the present invention being applied to continuous 2 times chargings by process sequence, will not The dephosphorization clinker of previous charging is discharged to the schematic diagram of the preprocess method of the iron liquid of this charging when outside stove.
Embodiment
Hereinafter, the present invention is specifically described referring to the drawings.Fig. 1 is the preprocess method in the iron liquid for implementing the present invention When the Longitudinal cross section schematic of converter type refining furnace that uses.Fig. 2 is to be represented by process sequence by the pretreatment of the iron liquid of the present invention The dephosphorization clinker of previous charging discharge the iron liquid of this charging when outside stove applied to continuous 2 times chargings, not by method The schematic diagram of preprocess method.It should illustrate, Fig. 1 is the figure for the desiliconization treatment process for representing Fig. 2-(B).
In the preprocess method of the iron liquid of the present invention, top and bottom complex blowing (top and are carried out using as shown in Figure 1 Bottom blowing) converter type refining furnace 1.Top blast is via the top-blown spray gun that can be lifted in the inside of converter type refining furnace 1 2, oxygen-containing gas is supplied from the front end of top-blown spray gun 2 to iron liquid 5 and is carried out as oxygen source.As oxygen-containing gas, oxygen can be used Gas, oxygen-enriched air, air, the mixed gas of oxygen and non-active gas.Figure 1 illustrates use oxygen 9 as oxygen-containing gas Example.Here, oxygen 9 refers to industrial pure oxygen.Bottom blowing air port of the bottom blowing via the bottom for being arranged on converter type refining furnace 1 (bottom-blowing tuyere) 3 and carry out.Can be the gas containing oxygen or can be only as bottom blown gas 10 For non-active gas such as argon gas, nitrogen.Bottom blown gas 10 with the stirring for strengthening iron liquid 5 by being blown into iron liquid except promoting Beyond the function for the melting for entering cold iron source, can also have by slag former (slag forming agent) together with carrier gas the bottom of from Blowing mouth 3 is blown into the function in iron liquid.
In the present invention, the refining of iron liquid 5 uses the converter type refining furnace 1 of more than 2.By at least 1 converter type therein Refining furnace 1 is used for the iron liquid pretreatment of the present invention, using remaining at least 1 converter type refining furnace 1 as Decarburising and refining Steel-making is used with pure oxygen converter, implements to have carried out the Decarburising and refining (pneumatic steelmaking of the iron liquid 5 of the iron liquid pretreatment of the present invention (converter steelmaking)).In other words, pre-processed using the converter type refining furnace 1 of iron liquid pretreatment, Then, the iron liquid 5 for implementing pretreatment is transferred to the steel-making of Decarburising and refining with carrying out Decarburising and refining in pure oxygen converter.Separately Outside, the situation that the present invention is suitable for use with the charging of 1 converter type refining furnace, 1 continuous 2 charging above and pre-processed, it is excellent The situation that choosing is applied to the charging of the continuous 10 times charging above and pre-processed.
In the present invention, desiliconization processing and dephosphorization treatment, such case are carried out to iron liquid 5 using 1 converter type refining furnace 1 Under, for refining pattern, with a kind of refining selected from refining pattern 1, following 2 kinds of refining patterns shown of refining pattern 2 Pattern come implement pretreatment.
Refining pattern 1：A kind of method of refining, is carried out successively：Desiliconization processing is carried out to the iron liquid in converter type refining furnace Desiliconization treatment process；The centre that the desiliconization clinker generated in the desiliconization treatment process is discharged from above-mentioned converter type refining furnace Deslagging process；The dephosphorization treatment process of dephosphorization treatment is carried out to the iron liquid remained in above-mentioned converter type refining furnace；Will be through dephosphorization The process of coming out of the stove that the iron liquid of processing is come out of the stove from above-mentioned converter type refining furnace；It is de- not by what is generated in above-mentioned dephosphorization treatment process The iron liquid of charging next time is encased in above-mentioned converter type refining furnace by phosphorus clinker in the case of being discharged from converter type refining furnace Iron liquid loads process.
Refining pattern 2：A kind of method of refining, is carried out successively：Desiliconization processing is carried out to the iron liquid in converter type refining furnace Desiliconization treatment process；The centre that the desiliconization clinker generated in the desiliconization treatment process is discharged from above-mentioned converter type refining furnace Deslagging process；The dephosphorization treatment process of dephosphorization treatment is carried out to the iron liquid remained in above-mentioned converter type refining furnace；Will be through dephosphorization The process of coming out of the stove that the iron liquid of processing is come out of the stove from above-mentioned converter type refining furnace；The dephosphorization stove that will be generated in above-mentioned dephosphorization treatment process The deslagging process that slag is discharged from converter type refining furnace；It is encased in by the iron liquid of charging next time in above-mentioned converter type refining furnace Iron liquid loads process.
First, refining pattern 1 is illustrated according to the order of each operation.
In refining pattern 1, when the pretreatment of the iron liquid of previous charging is also implemented with refining pattern 1, such as Fig. 2-(A) institute Show, the total amount of the dephosphorization clinker 7 generated in the dephosphorization treatment process of previous charging is remained in stove.Residuing in the converter type Load the cold iron source 8 such as scrap iron on the dephosphorization clinker 7 of refining furnace 1, by from blast furnace casting, the iron liquid 5 that uses in this charging Load (iron liquid loading process) via charge packet (charging ladle) 11.To refine the iron liquid that pattern 2 implements previous charging Pretreatment when, load in empty converter type refining furnace 1 after the cold iron sources 8 such as scrap iron, load iron liquid 5.
Next, the supply oxygen of iron liquid 5 and/or iron oxide into the converter type refining furnace are used as oxygen source, such as Fig. 2-(B) It is shown, implement desiliconization processing (desiliconization treatment process).(desiliconization is anti-with the oxygen reaction in the oxygen source supplied for the silicon contained in iron liquid 5 Should；Si+2O→SiO2) and carry out desiliconization processing.Bonded hard ferrite magnet is increased because of the heat of oxidation of the silicon of the desilication reaction, promote iron The melting of cold iron source 8 in liquid.In addition, the dephosphorization clinker 7 of the previous charging residued in stove and being generated by desilication reaction SiO2, the iron oxide that is generated by the reaction of the oxygen source with being supplied and addition slag former mix and react, generated in stove Desiliconization clinker 6.It should illustrate, in fig. 2, the iron liquid after desiliconization processing is in order to the iron liquid 5 with desiliconization before processing is distinguished It is expressed as iron liquid 5A.
Now, in desiliconization treatment process, in order to avoid produce from the dephosphorization clinker 7 of the previous charging residued in stove to The rephosphorization of iron liquid 5, to basicity ((quality %CaO)/(quality %SiO of desiliconization clinker 62)) suitably adjusted.
Phosphorus in known dephosphorization clinker is in many cases with 2CaOSiO2And 3CaOP2O5Solid solution thereof deposit .Therefore, in order to prevent rephosphorization from reacting, try to prevent the solid solution in the dephosphorization clinker 7 and SiO that is generated in desiliconization processing2 Melted in the desiliconization clinker 6 for reacting and generating.The present inventor etc. is furtherd investigate, and is as a result found by being handled with desiliconization The basicity of desiliconization clinker 6 afterwards does not reach the SiO in state diagram2The mode of zone of saturation adjusts the composition of desiliconization clinker 6, can Substantially prevent rephosphorization from reacting.
In common desiliconization treatment conditions, bonded hard ferrite magnet is 1300 DEG C or so, the FeO concentration in desiliconization clinker for 10~ By making the basicity of the desiliconization clinker 6 after desiliconization processing anti-to suppress rephosphorization for more than 0.8 on 20 mass % or so, therefore practicality Should.In order to be more reliably prevented from rephosphorization, if desiliconization handle it is whole during by the basicity of desiliconization clinker 6 be adjusted to 0.8 with It is upper.
Basicity ((quality %CaO)/(quality %SiO of desiliconization clinker 62)) can be calculated based on following (1) formulas.
Basicity=[(residual CaO amounts (kg/t iron liquids) in stove)+(addition CaO amounts (kg/t) iron liquid in desiliconization processing)] ÷ [(residual Si O in stove2Measure (kg/t iron liquids))+(the generation SiO in desiliconization processing2Measure (kg/t iron liquids))] ... (1)
It should illustrate, the generation SiO in desiliconization processing2Amount can be handled by desiliconization in iron liquid in silicon concentration change and Calculate.
In the present invention, in order to adjust the basicity of desiliconization clinker 6, in desiliconization before processing and/or desiliconization processing, according into For the basicity and (1) formula of predeterminated target, CaO series solvents are added in stove as needed.As the CaO series solvents, it can use Quick lime, calcium carbonate, dolomite, pretreatment furnace slag (clinker of generation in the pretreatment (dephosphorization treatment) of iron liquid), Converter Slag (in steel-making with the clinker generated in the Decarburising and refining in pure oxygen converter), casting ladle clinker (ladleslag) (steel in casting ladle Clinker present on liquid, addition quick lime etc. in the deoxidation products such as the converter slag that is flowed into casting ladle and aluminum oxide in tapping Material formed by furnace slag modifier) etc..In addition, the dephosphorization clinker 7 discharged in refining pattern 2 to outside stove can also be as CaO It is that flux is used.As aftermentioned from the viewpoint of deslagging, the basicity of the desiliconization clinker 6 after desiliconization processing is preferably 1.5 Hereinafter, as long as scope for 0.8~1.5.It should illustrate, in order to reduce the usage amount of CaO systems flux, after desiliconization processing The low person of basicity of desiliconization clinker 6 is favourable, and more preferably less than 1.2.
As the adding method of CaO systems flux, granular and block (lump's) can put into from the hopper on stove, powdery It can carry out blowing addition (referred to as " projecting ") via the grade of top-blown spray gun 2.The addition time of CaO systems flux can be from starting to take off Silicon has handled meter, in order to make the abundant scorification of desiliconization clinker 6 (slag formation) in being handled in desiliconization, can be in advance into stove Put into CaO systems flux.Wherein, in refining pattern 1, because remaining the dephosphorization clinker 7 of previous charging in stove, in supply When the silicon concentration of the iron liquid 5 of desiliconization treatment process is low, there is a situation where that CaO systems flux need not be added.
Can be only the oxygen 9 from top-blown spray gun 2 as the oxygen source handled for desiliconization, can also be in oxygen 9 simultaneously With iron oxide (not shown).In order to form the desiliconization clinker 6 of target basicity in the desiliconization processing carried out with the short time, tool is used The iron oxide for having the function for the scorification for promoting CaO systems flux is effective.On the other hand, melted from an object of the present invention, i.e. From the viewpoint of solving substantial amounts of cold iron source 8, the iron oxide absorbed heat when not being preferably used in heating and when decomposing.Therefore, from the sight Point considers, preferably avoids using iron oxide as far as possible as oxygen source.It should illustrate, because being used as essence using converter type refining furnace 1 Container is refined,, also being capable of abundant shape even if carrying out desiliconization processing as oxygen source using only oxygen 9 so strong mixing can be carried out Into the desiliconization clinker 6 of target basicity.
If desilication reaction is carried out, the silicone content in iron liquid is changed into below 0.20 mass %, and decarburizing reaction is also little by little Activate and the increase of the formation speed of CO gases.In this case, will be in desiliconization stove as long as the character of desiliconization clinker 6 is appropriate In slag contain substantial amounts of less CO gas bubbles, desiliconization clinker 6 also increase to its apparent volume not bubbles when several times with On, become so-called unfoamed state.In middle deslagging process after desiliconization processing, the scope not flowed out in iron liquid 5A from fire door Inside make body of heater deflection, desiliconization clinker 6 is discharged using the overflow from fire door, the height of the clinker liquid level of the fire door of the body of heater away from deflection Degree is higher, can more be effectively discharged out clinker.Therefore, in desiliconization processing, the scope preferably not sprayed in clinker from fire door Promote the foamed of desiliconization clinker 6, be also able to maintain that the mode of foamed to adjust the iron oxide in clinker in middle deslagging Concentration etc..
Deslagging process in the middle of being set after the desiliconization treatment process, shown in such as Fig. 2-(C), with converter type refining furnace 1 Being provided with the side mode above of plug for outlet 4 (tap hole) makes converter type refining furnace 1 vert, and will largely contain de- The SiO produced in silicon processing2The fire door of desiliconization clinker 6 from converter type refining furnace 1 of low alkalinity be expelled to clinker accepting container (not shown).
From the viewpoint of the deslagging of middle deslagging process, the basicity of the desiliconization clinker 6 being preferably discharged for 1.5 with Under, and make the temperature of desiliconization clinker 6 for more than 1280 DEG C.This is, in order to ensure the mobility of desiliconization clinker 6, to obtain good row Slag and ash-retention efficiency.Ash-retention efficiency can be obtained by following (2) formulas.
Ash-retention efficiency (quality %)=(discharge clinker quality) × 100/ [(the clinker quality generated in desiliconization treatment process)+ (residual mass of the dephosphorization clinker of previous charging)] ... (2)
From the viewpoint of the addition for reducing CaO systems flux, the basicity for preferably making desiliconization clinker 6 is less than 1.2.
When the basicity of desiliconization clinker 6 is more than 1.5, make slag fluidity step-down because generating solid phase clinker.Even if in addition, de- The temperature of silicon clinker 6 be less than 1280 DEG C, similarly reduce the mobility of clinker because of the increase of solid phase clinker, except this with Outside, the viscosity rising of liquid phase clinker in itself is also resulted in.Therefore, the mobility step-down of desiliconization clinker 6, it becomes difficult to effectively carry out Middle deslagging.According to the primary condition of the iron liquid 5 used, for example, it is being less than 0.05 as carrying out silicon concentration during desiliconization processing makes iron liquid Stage as quality % also produces situation of the temperature less than 1280 DEG C of desiliconization clinker 6.Now, in order to prevent desiliconization clinker 6 Mobility reduction, it is necessary to further supply oxygen, progress intermediate row slag process after slag temperature is improved using decarburizing reaction.
Preferred condition for middle deslagging is that the temperature of desiliconization clinker 6 is more than 1320 DEG C.On the other hand, if The temperature of desiliconization clinker 6 is too high, even if the basicity of desiliconization clinker 6 then is adjusted into more than 0.8, rephosphorization also occurs sometimes, therefore It is preferred that the slag temperature after desiliconization processing terminates is less than 1380 DEG C.
According to following reason, the ash-retention efficiency of the desiliconization clinker 6 in preferably middle deslagging process ensures more than 30 mass %. That is, in the dephosphorization treatment process after, in terms of dephosphorisation reaction is carried out, it is necessary to the basicity of dephosphorization clinker 7 is adjusted into 1.5~ 3.5, if ash-retention efficiency is less than 30 mass %, the quantitative change for the CaO systems flux to be added in dephosphorization treatment process is more.Moreover, Therefore the quantitative change of the dephosphorization clinker 7 of dephosphorization treatment is more, it is impossible to suppress the clinker foamed in dephosphorization treatment, produces because of dephosphorization clinker The risk of operation failure caused by the 7 fire door leakage from converter type refining furnace 1 also increases.
On the other hand, if discharge has at the dephosphorization of subsequent processing more than 80 mass % of the desiliconization clinker 6 of generation The scorification of the CaO systems flux newly added in science and engineering sequence is damaged, and hinders the possibility of dephosphorisation reaction, therefore preferably ash-retention efficiency is 80 matter Measure below %.
The quality of the desiliconization clinker 6 residued in after middle deslagging process in stove passes through from the gross mass of desiliconization clinker 6 Subtract the quality of the desiliconization clinker 6 of discharge and calculate.The gross mass of desiliconization clinker 6 by above-mentioned (2) formula denominator, i.e. [(desiliconization The clinker quality generated in treatment process)+(residual mass of the dephosphorization clinker of previous charging)] and obtain.Here, not by before When the dephosphorization clinker 7 of secondary charging is discharged to outside stove, the residual mass of the dephosphorization clinker of previous charging is by the centre of previous charging The calculated value (inferred value) of the quality of the desiliconization clinker 6 residued in after deslagging process in stove and by the dephosphorization in previous charging Value obtained by the incrementss of the dephosphorization clinkers 7 caused by oxide such as the flux that is added in science and engineering sequence, the phosphoric acid of generation are total.It is another Aspect, can be by the residual of the dephosphorization clinker of previous charging in the case where the dephosphorization clinker 7 of previous charging is discharged to outside stove Quality be calculated as 0 (zero) or empirically hold, the value of the standard of dephosphorization clinker adhesion amount in stove.
The quality of the desiliconization clinker 6 of discharge is by being expelled to the weighing of the grade of desiliconization clinker 6 of clinker accepting container (not shown) It is worth or is expelled in the clinker accepting container after the foamed calmnessization (subside) of the desiliconization clinker 6 of clinker accepting container The visual observation of slag surface position etc. and obtain.
Here, in middle deslagging, if obtaining larger deslagging speed, or in order in the bubble of desiliconization clinker 6 The level of residue in stove is reduced when foamization is insufficient and increases the angle excursion of converter type refining furnace 1, then iron liquid 5A and desiliconization clinker 6 Together from fire door discharge to a certain degree.Now, iron liquid 5A discharge rate may not be constant.But, in many cases, in desiliconization clinker In the iron liquid 5A quality ratio that is mixed into for example in below 5 mass % scope be relatively stable level.Therefore, even in discharge Desiliconization clinker in the quality ratio of the pig iron obtained by using the sample by desiliconization clinker 6 of the iron liquid 5A quality that is mixed into etc. Weighing value as typical value and based on effluent and calculate, also have no problem in many cases.Therefore, it can by by The weighing value of effluent in clinker accepting container subtracts the quality for the iron liquid 5A being mixed into the desiliconization clinker of discharge and obtained The quality of the desiliconization clinker 6 of discharge.
The matter relative to the iron liquid 5A residued in stove can be obtained according to the quality that desiliconization clinker 6 is remained in the stove calculated The ratio (kg/ tons of iron liquids) of the desiliconization clinker residual quantity of amount.The residual of desiliconization clinker 6 in the stove after middle deslagging process Amount is preferably below 25kg/ tons of iron liquids.
As long as the residual quantity of desiliconization clinker 6 is below 25kg/ tons of iron liquids, the CaO in the dephosphorization treatment process then carried out The usage amount for being flux would not be excessive, can efficiently implement dephosphorization treatment.In addition, the dephosphorization slag amount after dephosphorization treatment For in proper range, thus do not discharge dephosphorization clinker 7 and carry out in the state of residuing in stove next charging iron liquid 5 it is pre- During processing, slag amount can be reduced excessive and cause the risk of operation failure.It is therefore preferable that being to remain desiliconization clinker 6 in stove Mode below 25kg/ tons of iron liquids carries out middle deslagging.
It should illustrate, ash-retention efficiency (quality %) and residual quantity (kg/ of the desiliconization clinker 6 relative to iron liquid 5A of desiliconization clinker 6 Ton iron liquid) and do not correspond to 1 to 1.This is due to that the quality of desiliconization clinker 6 changes because of charging.
Because the mobility for the desiliconization clinker 6 being rejected in middle deslagging process outside stove is high, it is present in desiliconization stove Granulated iron in slag is easily settled in iron liquid.Therefore, if desiliconization clinker 6 compared with the dephosphorization clinker 7 after dephosphorization treatment, In desiliconization clinker 6, the metal ferrous components being mixed into clinker are reduced to below 1/10 or so.On the other hand, it is mixed into dephosphorization Metal ferrous components in clinker are difficult to separate with dephosphorization clinker 7, and its major part can not be reclaimed in the form of ferrous components and with dephosphorization The form of clinker 7 is handled.Therefore, handled using the dephosphorization clinker 7 after dephosphorization treatment not being discharged to outside stove in desiliconization The method of refining for the refining pattern 1 being afterwards only discharged to desiliconization clinker 6 outside stove, can realize greatly improving for iron yield rate.
After middle deslagging process, CaO system's flux and oxygen source are supplied to the iron liquid 5A residued in converter type refining furnace, is such as schemed Shown in 2- (D), dephosphorization treatment (dephosphorization treatment process) is carried out to iron liquid 5A.In dephosphorization treatment process, the dephosphorization clinker 7 in stove Basicity be adjusted to 1.5~3.5 scope, be more preferably adjusted to 1.8~3.0 scope.Used in the dephosphorization treatment process Oxygen source and desiliconization processing in the same manner as based on the oxygen 9 from top-blown spray gun 2, but also do not closed using a part of iron oxide System.
As the CaO systems flux used in dephosphorization treatment, quick lime, calcium carbonate etc. can be used.Wherein, it is not limited to These, total 100 mass parts that can also be used relative to the composition beyond iron and iron oxide contain CaO more than 50 mass parts And contain the material of other compositions such as fluorine, aluminum oxide as CaO systems flux during dephosphorization treatment as needed.It is used as the CaO systems The adding method of flux, it is granular and block can be from the hopper input on stove, powdery can be carried out via the grade of top-blown spray gun 2 Projection.
Oxygen in the oxygen source that phosphorus in iron liquid is supplied to aoxidizes and is changed into phosphorous oxides (P2O5), the phosphorous oxides by The scorification of CaO systems flux and formed and as in the dephosphorization clinker 7 of dephosphorization refining agent function with as 3CaOP2O5It is steady The form of the compound for the state that shapes is acquired, and iron liquid 5A dephosphorisation reaction is carried out.If the dephosphorization treatment time is as defined in Between, or supply the CaO systems flux and oxygen source of ormal weight, or dephosphorisation reaction is carried out and iron liquid 5A phosphorus concentration is reduced to Setting, then terminate dephosphorization treatment.Should illustrate, in fig. 2, iron liquid after dephosphorization treatment in order to the iron liquid before dephosphorization treatment 5A is distinguished and is expressed as iron liquid 5B.
It is preferred that the usage amount of CaO systems flux according to the residual quantity of the desiliconization clinker 6 residued in after middle deslagging process in stove, The conditions such as iron liquid 5B target phosphorus content, refining temperature after dephosphorization treatment and be adjusted.For example, the residual of desiliconization clinker 6 When measuring as below 15kg/ tons of iron liquids, the less residue of desiliconization clinker 6 also can be effectively with less CaO systems flux usage amount Dephosphorization treatment is carried out until phosphorus content in below 0.03 mass % relatively low iron liquid.On the other hand, the residual quantity of desiliconization clinker 6 , it is necessary in order to carry out dephosphorization until iron liquid 5B target phosphorus content (for example, 0.03 mass %) makes during more than 25kg/ tons of iron liquids With substantial amounts of CaO systems flux, the amount of dephosphorization clinker 7 also becomes huge.In addition, the residual quantity of desiliconization clinker 6 is in 15kg/ tons of iron liquids When between 25kg/ tons of iron liquids, the usage amount of CaO systems flux is adjusted according to the iron liquid 5B of target phosphorus content, from And dephosphorization treatment can be relatively efficiently carried out, but the amount of dephosphorization clinker 7 also increases and decreases therewith.
After dephosphorization treatment terminates, such as shown in Fig. 2-(E), converter type refining furnace 1 is set to be tilted to the side for being provided with plug for outlet 4 Iron liquid 5B in converter type refining furnace is come out of the stove (process of coming out of the stove) via plug for outlet 4 to iron liquid holding container (not shown).Fig. 2- (E) the symbol 5B shown in is the iron liquid after dephosphorization treatment.Flowed confirming the part of dephosphorization clinker 7 and being mixed into from plug for outlet 4 In the iron liquid 5B gone out and at the time of outflow, make the deflection in the way of its fire door is changed into top of converter type refining furnace 1, terminate to come out of the stove.
The residual dephosphorization clinker 7 in the converter type refining furnace 1 after terminating of coming out of the stove, in addition, remaining although not shown but also a small amount of Iron liquid 5B.In process of coming out of the stove, in the latter stage for coming out of the stove process, a part for dephosphorization clinker 7 is mixed into the iron flowed out from plug for outlet 4 In liquid 5B and flow out, but the outflow of the dephosphorization clinker 7 is inevitable, is discharged with being not intended that figure, in the present invention, by this The total amount that state is defined as dephosphorization clinker 7 is remained in stove.
This is come out of the stove after process, does not return to the iron shown in Fig. 2-(A) from the discharge dephosphorization of converter type refining furnace 1 clinker 7 Liquid loads process, implements to be encased in desiliconization processing and the dephosphorization of the iron liquid 5 of charging next time of converter type refining furnace 1 according to above-mentioned Processing.The dephosphorization clinker 7 residued in stove is in a ratio of low temperature, iron oxide concentration with the converter slag generated in Decarburising and refining It is low therefore reactive relatively low with iron liquid 5.Therefore, even if without the solidification because of the dephosphorization clinker 7 caused by input coolant Dispose and load iron liquid 5 from the top of dephosphorization clinker 7, be not also a problem in operation.
But, such as shown in Fig. 2-(F), can also be so that the state of converter type refining furnace 1 upright (turnupright) be from stove On hopper to converter type refining furnace 1 put into small size cold iron source or will the slag making materialses such as lime stone put into etc. after, make turn Deflection for several times, makes to residue in the dephosphorization clinker 7 in stove and solidified (dephosphorization clinker curing process) repeatedly before and after type of furnace refining furnace 1.
Refining pattern 1 is implemented.In refining pattern 1, the total amount of dephosphorization clinker 7 is set to remain in stove and start next time The desiliconization processing of charging, therefore, it is possible to the heat having in the desiliconization processing of charging next time to the dephosphorization clinker 7 of previous charging Amount and ferrous components are reclaimed, and can be used as the de- of charging next time by the use of the CaO compositions in the dephosphorization clinker of previous charging The CaO sources of silicon processing.The new CaO beyond clinker thereby, it is possible to reduce the recycling in the desiliconization processing of charging next time It is the usage amount of flux.
On the other hand, make fire door inclined in the way of upward in the process of coming out of the stove that refining pattern 2 is shown in Fig. 2-(E) Tiltedly terminate to come out of the stove, converter type refining furnace 1 is further verted afterwards, make fire door towards underface by dephosphorization clinker 7 from fire door The discharge (deslagging process) into clinker accepting container (not shown).In the deslagging process, as clinker accepting container, preferably use The clinker accepting container for the desiliconization clinker 6 discharged in middle deslagging process is not housed in.Further preferably from clinker accepting container Discharge etc. into respective slag (slag cooling yard), pit (dry slag pit), to desiliconization clinker 6 and dephosphorization Clinker 7 is managed respectively.
In refining pattern 2, by outside the deslagging of dephosphorization clinker 7 to stove, in addition, implemented according to refining pattern 1, By after outside the deslagging of dephosphorization clinker 7 to stove after process of coming out of the stove, by next time, the iron liquid 5 of charging is encased in converter type refining furnace.Therefore, In charging next time of the charging of application refining pattern 2, the state of the total amount for the dephosphorization clinker 7 that can be discharged has been discharged in Xiang Conglu Converter type refining furnace 1 in load iron liquid 5.Dephosphorization clinker 7 is attached to the inwall of converter type refining furnace 1 and remained, but can discharge The total amount of dephosphorization clinker 7 discharged, therefore the adhesion amount of dephosphorization clinker 7 is few, without considering returning from dephosphorization clinker 7 Phosphorus.
In addition, in the desiliconization treatment process of charging next time carried out after the charging of application refining pattern 2, due to not residual The dephosphorization clinker 7 of previous charging is stayed, it is and above-mentioned so replace the dephosphorization clinker 7 of previous charging using other CaO systems flux The desiliconization treatment process of refining pattern 1 similarly implements the composition adjustment of desiliconization clinker 6.The CaO systems flux now used does not have It is particularly limited to, can also be in pretreatment furnace slag (dephosphorization stove in addition to the general CaO systems flux such as quick lime, lime stone Slag), converter slag, casting ladle clinker, the copper smelter slag such as dephosphorization clinker 7 in the deslagging process of refining pattern 2 outside deslagging to stove enter Row is recycled.
In these copper smelter slags, the dephosphorization clinker 7 being rejected in the deslagging process of refining pattern 2 outside stove is particularly i.e. Make to be that basicity is relatively low, the desiliconization of short time handles also easy scorification, thus state that can be not crush, relatively large is directly sharp With, and it can also reclaim the pig iron largely contained in dephosphorization clinker in iron liquid 5, thus preferably as making in being handled in desiliconization CaO systems flux.In this case, the processing cost in order to save dephosphorization clinker 7, preferably without the crushing of dephosphorization clinker 7, The sorting of feed metal composition and from clinker accepting container directly or via places to place such as pits, utilize the weight such as wheel loader Type equipment point takes and put into scrap iron loading chute, is encased in together with scrap iron in converter type refining furnace 1.Now, from suppression From the viewpoint of radiation loss processed, preferably dephosphorization clinker 7 or it is mixed into relatively large feed metal therein with as high as possible The state of temperature is operated, and is encased in converter type refining furnace 1.That is, it will be preferably rejected in the deslagging process of refining pattern 2 Dephosphorization clinker 7 outside stove is used as the CaO systems flux directly used without crushing with the condition of high temperature in desiliconization processing.
In addition, in charging next time of the charging of application refining pattern 2, iron liquid residues in the slag amount in stove when loading It is few thus less in the silicone content of iron liquid 5, during for example, below 0.35 mass %, without the intermediate row shown in Fig. 2-(C) Slag process, in addition, can also implement according to refining pattern 1.Now because without middle deslagging process, can remove Go middle deslagging process time and the activity duration of shortening.In addition, so that the state that appropriate desiliconization clinker 6 is residued in stove is entered The dephosphorization treatment process of row subsequent processing, therefore the slag amount in stove can be almost accurately held, and CaO systems can be promoted to melt The scorification of agent, the slag amount needed for ensuring dephosphorization in the case of without excessive CaO systems flux.In addition, because making dephosphorization The total amount of clinker 7 remains in the desiliconization for starting next charging in stove and handled, so can be obtained in charging in next time and at this The situation identical effect of the above-mentioned refining pattern 1 including middle deslagging process is implemented in secondary charging.
In addition, in the case that the silicone content of the iron liquid 5 used in this charging is more than 0.70 mass %, can not fill sometimes The iron liquid 5A divided after reduction desiliconization processing silicon concentration, even if carrying out middle deslagging to desiliconization clinker 6, in dephosphorization treatment process Slag amount also become excessive, can not carry out next charging so that the total amount of dephosphorization clinker 7 to be remained in the state in stove sometimes Desiliconization treatment process.In other words, because can not select refining pattern 1 sometimes, it is advantageous to using silicone content as 0.70 mass % Following iron liquid 5 is object to apply the present invention.
In addition, the refining pattern by previous charging is not limited, desiliconization before processing iron liquid 5 silicone content more than 0.70 matter In the case of measuring %, after the desiliconization treatment process also shown sometimes in Fig. 2-(B), without dephosphorization treatment in the case of will be through The iron liquid 5A of desiliconization processing comes out of the stove from converter type refining furnace 1, by iron liquid 5A for de- with what is carried out in pure oxygen converter in steel-making Carbon is refined.The growing amount of desiliconization clinker 6 it is excessive, hinder iron liquid 5A from the case that converter type refining furnace 1 is come out of the stove, can be in iron Before liquid 5A comes out of the stove, opposite side deflection when making converter type refining furnace 1 to coming out of the stove, the degree come out of the stove in without prejudice to is from fire door Partly discharge desiliconization clinker 6, thereafter, iron liquid 5A is come out of the stove.Now, after iron liquid 5A comes out of the stove, with the bottom of converter type refining furnace 1 Portion makes converter type refining furnace 1 vert round about for the mode of top, from fire door discharge desiliconization clinker 6.
It should illustrate, the mobility of the dephosphorization clinker 7 after dephosphorization treatment is low, therefore it is difficult in order to control the dephosphorization stove in stove The residual quantity of slag 7 and partly discharge.Even if in addition, obstinately carrying out the discharge of part, also resulting in significantly prolonging for activity duration It is long.Therefore, generally select and remove attached component in stove and the method for almost discharging total amount, or without deslagging to remain in State in stove remains any of method of charging next time to implement.
In the present invention, the selection of refining pattern 1 and refining pattern 2 is carried out as follows.
(A)：The Analysis of phosphorus contents value of iron liquid 5B after the dephosphorization treatment of this charging is the matter of 0.030 mass %~0.060 Measure % in the range of below setting Z when, pre-processed using the method for refining of refining pattern 1.
(B)：When the Analysis of phosphorus contents value of iron liquid 5B after the dephosphorization treatment of this charging exceedes above-mentioned setting Z, use The method of refining of refining pattern 2 is pre-processed.
Setting Z is the Analysis of phosphorus contents in the mass % of 0.030 mass %~0.060 iron liquid 5B according to treatment conditions Some value set in the range of value.Setting Z according to the equipment of the converter type refining furnace 1 used, this dephosphorization fed at The refining condition of the desiliconization processing of reason and charging next time, the composition of before processing of the iron liquid of charging next time, temperature conditionss, target The conditions such as the iron liquid 5B phosphorus content after dephosphorization treatment, in the pretreatment of charging next time, spray or dephosphorization not causing clinker The operation such as deficiency failure or do not make desiliconization handle after middle deslagging activity duration long scope, be avoided as much as So that dephosphorization clinker 7 remains in the ratio reduction that the state in stove is directly utilized in next time in charging, fitted according to actual effect Locality is determined.
The actual effect of the dephosphorization treatment of iron liquid based on past dephosphorization treatment etc., is defined using the phosphorus content in iron liquid The mode of target zone adjusts the operating conditions such as the usage amount of oxygen source and CaO systems flux and implemented.Setting Z is filled relative to this The target zone of phosphorus content in the iron liquid of material sets value higher to a certain degree.Therefore, the phosphorus content in iron liquid exceedes regulation Value Z situation controls the situation of the operating condition of dephosphorization treatment corresponding like that with assuming without the image of Buddha.Including：Middle deslagging The residual quantity of clinker afterwards is more than assuming, the basicity of dephosphorization clinker less than situation about assuming, or because slag amount is excessive or stove The basicity of slag is low and foamed of the clinker in dephosphorization treatment excessively, blowing is interrupted etc. and to supply oxygen source like that without the image of Buddha is predetermined Situation etc..At this moment, if not carrying out desiliconization processing to the iron liquid that the clinker after dephosphorization treatment carries out deslagging and loads charging next time, Then it is possible to produce the rephosphorization from clinker to iron liquid, or in order to avoid clinker sprays, when causing processing because of blowing interruption etc. Between extend.
The risk for producing these problems in charging in next time is relatively low and relative with setting Z is set in this charging Reduction, setting Z then has the trend that increased dramatically if above to a certain degree.Therefore, setting Z is preferably 0.060 mass % Below.On the other hand, the ratio for the charging that deslagging can not be carried out to dephosphorization clinker and utilized in the desiliconization processing of charging next time Rate is set to relatively low and relative reduction with by setting Z.Therefore, setting Z is preferably more than 0.030 mass %.
In addition, the operating condition such as oxygen supply speed, charging next time in stove shape, the desiliconization processing of charging next time Silicone content, temperature conditionss of the before processing of iron liquid etc., the desiliconization of charging next time are handled from the viewpoint of being sprayed from clinker as not When being carried out under conditions of profit, the setting Z of preferably this charging is set to relatively low, the clinker ejection in reducing because being fed in next time Caused risk.In addition, when the phosphorus content of the iron liquid in charging next time after target dephosphorization treatment is relatively low, it is also preferred that this feeds Setting Z be set to it is relatively low.So, preferably setting Z considers above-mentioned each condition in each charging and determined, but dress every time When the variation of material is less, the fixed value of standard can be used.
Refining pattern 1 is identical untill the process of coming out of the stove shown in Fig. 2-(E) with refining pattern 2, process of coming out of the stove Afterwards, the iron liquid 5 of charging next time is not being loaded to the progress deslagging of dephosphorization clinker 7, or dephosphorization clinker 7 is carried out after deslagging to load The aspect of iron liquid 5 of charging next time is different.Therefore, until process of coming out of the stove terminates, as long as the phosphorus of the iron liquid 5B after clear and definite dephosphorization treatment Content analysis value, it is possible to apply the present invention with having no problem.
The feelings that refining pattern 2 is not smoothed out etc. in the middle deslagging of desiliconization clinker 6, dephosphorisation reaction is not smoothed out Applied under condition.In other words, the dephosphorization clinker 7 generated in the dephosphorization treatment of such case has basicity low, or slag amount mistake The big and low problem of reaction efficiency.If because occurred in charging next time using such dephosphorization clinker 7 because of clinker Clinker sprays caused by excessive, or causes the usage amount of CaO systems flux to increase, the possibility being had undesirable effect to operation It is high.When dephosphorisation reaction is not smooth, iron liquid 5B phosphorus content becomes many, therefore by setting appropriate Z, can select refining pattern 2 And the above-mentioned harmful effect for avoiding feed next time.
If additionally, it is believed that be repeated in the pretreatment for many times refining pattern 1, stove in the inferred value of slag amount by mistake Difference is gradually put aside and becomes big with deviating from for virtual condition.Clinker discharge rate in middle deslagging is easily influenceed by operating condition And reduce, in addition, easily evaluating into more than actual, therefore there is the trend of slag amount easily more than inferred value in actual stove.Cause This, if both away from becoming too much, the basicity of dephosphorization clinker reduction etc. and be changed into the condition unfavorable to dephosphorization treatment, iron Liquid 5B phosphorus content increase, becomes higher than setting Z.In this case, stove can be reduced by application refining pattern 2 The error of the inferred value of interior slag amount, then carry out appropriate refining controlling.
Even if in addition, the Analysis of phosphorus contents value of the iron liquid 5B after dephosphorization treatment is below setting Z, it is fed at this Afterwards, it is in the case where repairing of liner refractory body because of the grade of plug for outlet 4 etc. can not be such that dephosphorization clinker 7 remains in stove or pre- In the case of having determined during the such stopping of preventive overhaul, in order to avoid making dephosphorization clinker 7 remain in stove, also application refines mould Formula 2.
As described above, according to the present invention, using 1 converter type refining furnace 1 be carried out continuously desiliconization processing and In the preprocess method of the iron liquid 5 of dephosphorization treatment, determined based on the Analysis of phosphorus contents value of the iron liquid 5B after dephosphorization treatment process Whether the dephosphorization clinker 7 in stove is discharged to outside stove.In other words, the Analysis of phosphorus contents based on the iron liquid 5B after phosphorus treatment process Value is decided to become any refining pattern in refining pattern 1,2, connects so even being difficult to accurately hold in multiple charging Quality, the situation of composition of the clinker residued in the pre-treatment job of the continuous iron liquid 5 carried out in stove, are also achieved to iron liquid 5 Implement optimal preprocess method corresponding with situation, efficient desiliconization processing and efficient dephosphorization treatment are carried out to iron liquid 5.
Embodiment
Using the converter type refining furnace shown in Fig. 1, the pretreatment of following iron liquid is implemented more than 1 month respectively：Make regulation Value Z pre-processes (example 1 of the present invention) for the 0.040 mass % iron liquids for applying the present invention to carry out, makes setting Z be 0.050 matter Iron liquid pretreatment (example 2 of the present invention), the iron liquid pretreatment of the only progress of application refining pattern 1 measured % and carried out using the present invention (comparative example 1), the iron liquid pretreatment (comparative example 2) that only application refining pattern 2 is carried out.Implement pretreated iron liquid and load another Converter type refining furnace, i.e. steel-making carry out Decarburising and refining with pure oxygen converter (following, to be abbreviated as " converter "), are smelted into molten steel.To from The result for pre-processing Decarburising and refining is compared respectively.
Example 1,2 of the present invention and comparative example 1,2 be all the iron liquid of desiliconization before processing silicone content for 0.20~0.70 mass %, The scope that the phosphorus content of iron liquid is 0.100~0.120 mass %, bonded hard ferrite magnet is 1260~1350 DEG C, contains for silicon in iron liquid Each number of degrees distribution of phosphorus content and bonded hard ferrite magnet, is not present non-idol between example 1,2 of the present invention and comparative example 1,2 in amount, iron liquid Right difference.
During the amount for the scrap iron being encased in before iron liquid is fitted into the converter type refining furnace of pretreatment is based on each experiment Actual value, by the bonded hard ferrite magnet at the end of desiliconization is handled in the way of in the range of 1300~1350 DEG C in 50~100kg/ tons of iron The scope of liquid is adjusted.When carrying out Decarburising and refining to the pretreated iron liquid, do not load in the converter of Decarburising and refining Scrap iron.
In example 1,2 of the present invention and comparative example 1,2, refining pattern 1 and refining pattern 2 are provided to improve after desiliconization processing Middle deslagging when deslagging and desiliconization processing in carry out sending oxygen in the way of promoting the foamed of the desiliconization clinker in stove The adjustment of condition etc..But, in stove the composition of desiliconization clinker or the control of amount is insufficient, foamed excessive and desiliconization clinker from In the case that fire door sprays, refining is temporarily interrupted, the calm material of input makes to start refining after foamed calmnessization again.Such In the case of, cause processing time to extend.
In dephosphorization treatment process, any situation is all that the desired value for the phosphorus content for making the iron liquid after dephosphorization treatment is Below 0.030 mass %, the scope for supplying CaO systems flux 1.5~3.0 adjusts basicity while carrying out dephosphorization treatment.Make It is also de- using what is discharged in example 1,2 of the present invention in the case of refining pattern 2 in addition to quick lime (CaO) for CaO systems flux Phosphorus clinker.For the dephosphorization clinker of discharge, it is considered to the balance of yield and consumption and by 2~5 tons/charging application refine mould Converter type refining furnace is encased in chute via scrap iron loading together with scrap iron in charging next time of the charging of formula 2 or other chargings In, the CaO systems flux in being handled as desiliconization is used.
Iron liquid for Decarburising and refining strongly carries out desiliconization and the pretreatment of dephosphorization, but in the continuously casting work of subsequent handling Proceed the casting of continuous several times charging in sequence, in the case of iron liquid is supplied in the converter to Decarburising and refining not in time, The iron liquid that iron liquid or midway that pretreatment is not carried out terminate pretreatment is encased in the converter of Decarburising and refining and carries out decarburization essence Refining.When the iron liquid that pretreatment is not carried out is encased in the converter of Decarburising and refining, it will be equivalent to be encased in turning for pretreatment The scrap iron of amount in type of furnace refining furnace is encased in the converter of Decarburising and refining before iron liquid is fitted into.In addition, in Decarburising and refining, Adjusted according to phosphorus concentration of iron liquid in the converter for being encased in Decarburising and refining etc. as the quick lime of dephosphorization refining agent etc. Usage amount.Decarburising and refining is implemented with the frequency in average about 40 charging/days, exists during Decarburising and refining frequency is not because of each experiment Non- accidental difference.
In example 1 of the present invention, it is 0.040 mass % to make setting Z, in addition, making the setting Z be in example 2 of the present invention 0.050 mass %, above-mentioned refining pattern 1 is selected according to the Analysis of phosphorus contents value of the iron liquid after the dephosphorization treatment of this charging Or refining pattern 2, after the pretreatment for the iron liquid for carrying out this charging, load the iron liquid of charging next time, then carry out the pre- of iron liquid Processing.Desiliconization clinker residual quantity (Q) in the stove after middle deslagging process is calculated in the following way, i.e., from according to previous At the residual quantity of dephosphorization clinker in the stove of the desiliconization before processing of the actual effect calculating of charging and the desiliconization according to this charging Subtract and be arranged at by utilizing under stove in the aggregate value (Q1) of clinker incrementss in the desiliconization processing that the actual effect of reason is calculated The content of the pig iron is assumed to 3 matter by the measured value (Q2) for the effluent quality that the meausring apparatus of the chassis of clinker accepting container is measured Amount % and the discharge rate (0.97 × Q2) of desiliconization clinker inferred and calculate (calculating formula；Q=Q1-0.97 × Q2).
For total charge weight of the scrap iron in converter type refining furnace from the converter to pretreatment and Decarburising and refining Total usage amount of (kg/ tons of iron liquids), quick lime in the converter of the converter type refining furnace and Decarburising and refining of pretreatment Iron yield rate (the matter of (kg/ tons of iron liquids), total in the converter of the converter type refining furnace and Decarburising and refining of pretreatment Amount %), because the clinker of the converter type refining furnace of pretreatment spray and occurs refining interrupt charging ratio, desiliconization handle When carrying out intermediate row slag afterwards required deslagging time, desiliconization and/or the pretreatment of dephosphorization implementation ratio (implement ratio (%)= (pretreatment charging number) × 100/ (Decarburising and refining charging number)) and dephosphorization treatment after the Analysis of phosphorus contents value of iron liquid be The ratio of below 0.030 mass % charging number and Decarburising and refining charging number, shows the result during each experiment in table 1. The value shown in table 1 is respective average value.In addition, application charging ratio (the refining pattern of the refining pattern 2 of example of the present invention 2 application charging ratio (%)=(the application charging number+refining of refining pattern 1 of (the application charging number of refining pattern 2) × 100/ Pattern 2 application charging number)) in the case of example 1 of the present invention be 7.5%, in the case of example 2 of the present invention be 4.0%.
[table 1]
As shown in table 1, in comparative example 2, scrap iron charge weight is few, and total usage amount of quick lime is more, and iron yield rate is low, Can not effectively it be pre-processed and Decarburising and refining.
In comparative example 1, compared with comparative example 2, scrap iron charge weight increase, while iron yield rate is improved, because by dephosphorization stove The recovery valency of ferrous components in the value and dephosphorization clinker of the heat that slag is recycled and produced in charging next time with the condition of high temperature Value is obvious.But, total usage amount of quick lime although can in desiliconization processing by the use of previous charging dephosphorization clinker as Lime source, is also equal with comparative example 2, does not reduce quick lime usage amount.This is due to caused by being sprayed because of the clinker in pretreatment Refining interrupt or deslagging time lengthening during middle deslagging so that the implementation ratio reduction of pretreatment, can not be substantially reduced The ratio increase of the charging of the phosphorus content of iron liquid after dephosphorization treatment, so the increasing with the quick lime usage amount in Decarburising and refining It is big to offset.
On the other hand, in example 1,2 of the present invention, the pretreatment as comparative example 1 is not caused to implement the drop of ratio The rising of the phosphorus content of iron liquid after low, dephosphorization treatment, during can dephosphorization clinker directly be fed with the condition of high temperature in next time again Utilize.Thus, it is possible to confirm in example 1,2 of the present invention, compared with comparative example 1 and comparative example 2, total usage amount energy of quick lime Enough it is greatly decreased, iron liquid is effectively pre-processed.
If example 1 relatively more of the present invention and example 2 of the present invention, by making setting Z in example 2 of the present invention from example 1 of the present invention 0.040 mass % increases to 0.050 mass %, so that the application percentage for refining pattern 2 is reduced to 4.0% from 7.5%, but because of stove Slag sprays and occurs the ratio for the charging that refining is interrupted from the Analysis of phosphorus contents value of 3% iron liquid increased to after 5%, dephosphorization treatment Ratio for below 0.030 mass % charging number and Decarburising and refining charging number is reduced to 82%, the implementation of pretreatment from 87% Ratio is reduced to 90% from 92%.Therefore, although sharp in the desiliconization processing of charging next time not to dephosphorization clinker progress deslagging The ratio increase of charging, but as shown in table 1, the iron yield rate or reduction quick lime that cannot further improve total are used The expectation effect of amount.This is due to be influenceed these to expect that effect is offseted by above-mentioned other evaluation index changes.
Symbol description
1 converter type refining furnace
2 top-blown spray guns
3 bottom blowing air ports
4 plug for outlet
5 iron liquids
6 desiliconization clinkers
7 dephosphorization clinkers
8 cold iron sources
9 oxygen
10 bottom blown gas
11 charge packets

Claims (4)

1. a kind of preprocess method of iron liquid, it is characterised in that carry out following process successively to iron using 1 converter type refining furnace Liquid is pre-processed：
Desiliconization treatment process, to carrying out desiliconization processing from the iron liquid of blast furnace casting；
Middle deslagging process, so that the state that the iron liquid handled through desiliconization is residued in the refining furnace will be handled in the desiliconization At least a portion of the desiliconization clinker generated in process is discharged from the refining furnace；
Dephosphorization treatment process, dephosphorization treatment is carried out to residuing in the iron liquid in the refining furnace in the middle deslagging process；
Come out of the stove process, the iron liquid through dephosphorization treatment is come out of the stove from the refining furnace；
Wherein, after the process of coming out of the stove, determine to be based on the Analysis of phosphorus contents value of the iron liquid after the dephosphorization treatment of this charging Dephosphorization clinker in the no refining furnace that will be generated in the dephosphorization treatment process is discharged to outside stove, determines discharge dephosphorization stove During slag, dephosphorization clinker is discharged from the refining furnace；When dephosphorization clinker is not discharged in decision, dephosphorization is not discharged from the refining furnace Clinker, then, by next time, the iron liquid of charging is encased in the refining furnace, carries out the pretreatment.
2. the preprocess method of iron liquid according to claim 1, it is characterised in that iron liquid after the dephosphorization treatment When Analysis of phosphorus contents value is certain below setting Z in the range of the mass % of 0.030 mass %~0.060, not from the refining The dephosphorization clinker is discharged in stove, when the Analysis of phosphorus contents value of the iron liquid after the dephosphorization treatment exceedes the setting Z, from The dephosphorization clinker is discharged in the refining furnace.
3. the preprocess method of iron liquid according to claim 1 or 2, it is characterised in that just completed the middle deslagging work The residual quantity of the desiliconization clinker in the refining furnace after sequence is below 25kg/ tons of iron liquids.
4. according to the preprocess method of iron liquid according to any one of claims 1 to 3, it is characterised in that the desiliconization processing The silicone content of iron liquid before process is below 0.70 mass %.
CN201580068170.6A 2014-12-16 2015-12-15 The preprocess method of iron liquid Pending CN107002154A (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103649341A (en) * 2011-07-19 2014-03-19 杰富意钢铁株式会社 Method for smelting molten pig iron
CN103773919A (en) * 2014-02-18 2014-05-07 钢铁研究总院 Method for smelting middle-high phosphorus molten iron in converter
WO2014112521A1 (en) * 2013-01-18 2014-07-24 Ｊｆｅスチール株式会社 Molten iron pre-treatment method
WO2014115526A1 (en) * 2013-01-24 2014-07-31 Ｊｆｅスチール株式会社 Preliminary processing method for molten iron
CN104053794A (en) * 2012-01-19 2014-09-17 杰富意钢铁株式会社 Method for preliminary treatment of molten iron

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11323420A (en) 1998-05-15 1999-11-26 Nippon Steel Corp Pretreating method for molten iron
JP2001271113A (en) 2000-03-27 2001-10-02 Nippon Steel Corp Converter-refining method for by-producing steel manufacturing slag having low free lime content
JP4937828B2 (en) * 2007-05-09 2012-05-23 新日本製鐵株式会社 Blowing method of molten steel
JP5487959B2 (en) 2009-12-28 2014-05-14 新日鐵住金株式会社 Hot metal removal Si removal P treatment method
JP6011248B2 (en) * 2011-11-29 2016-10-19 Ｊｆｅスチール株式会社 Pretreatment method of hot metal in converter
JP5408379B2 (en) * 2012-01-19 2014-02-05 Ｊｆｅスチール株式会社 Hot metal pretreatment method
JP5983492B2 (en) * 2012-03-26 2016-08-31 Ｊｆｅスチール株式会社 Hot metal pretreatment method

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103649341A (en) * 2011-07-19 2014-03-19 杰富意钢铁株式会社 Method for smelting molten pig iron
CN104053794A (en) * 2012-01-19 2014-09-17 杰富意钢铁株式会社 Method for preliminary treatment of molten iron
WO2014112521A1 (en) * 2013-01-18 2014-07-24 Ｊｆｅスチール株式会社 Molten iron pre-treatment method
WO2014115526A1 (en) * 2013-01-24 2014-07-31 Ｊｆｅスチール株式会社 Preliminary processing method for molten iron
CN103773919A (en) * 2014-02-18 2014-05-07 钢铁研究总院 Method for smelting middle-high phosphorus molten iron in converter

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Application publication date: 20170801