CN106868248A - Reduce the stainless steel method of refining that the refractory body of converter corrodes - Google Patents
Reduce the stainless steel method of refining that the refractory body of converter corrodes Download PDFInfo
- Publication number
- CN106868248A CN106868248A CN201611128252.8A CN201611128252A CN106868248A CN 106868248 A CN106868248 A CN 106868248A CN 201611128252 A CN201611128252 A CN 201611128252A CN 106868248 A CN106868248 A CN 106868248A
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- CN
- China
- Prior art keywords
- mgo
- refractory body
- stainless steel
- refining
- slag
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- 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
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/005—Manufacture of stainless steel
-
- 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
- C21C5/36—Processes yielding slags of special composition
-
- 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
Abstract
The invention discloses the stainless steel method of refining that a kind of refractory body for reducing converter corrodes.The stainless steel method of refining of an embodiment of the invention, including the step of load iron liquid to converter, decarbonation process and reduction step, the slag formed in above-mentioned decarbonation process is MgO-SiO2It is slag.Therefore, it is possible to produce MgO-SiO2It is slag and reduces slag amount, the stripping quantity thus, it is possible to reduce refractory body, the input amount of raw material is reduced and can reduce cost.
Description
Technical field
The stainless steel method of refining that the refractory body that converter is reduced the present invention relates to a kind of corrodes, more specifically,
It is related to a kind of stripping quantity that refractory body is greatly decreased by reducing the amount of slag such that it is able to reduce refractory body and corrode and improve
The life-span of refractory body, the usage amount of auxiliary material when decarburization can be greatly decreased and the usage amount of reducing agent reduce converter
The stainless steel method of refining that refractory body corrodes.
Background technology
The manufacture method of stainless steel can be roughly divided into according to the raw material for using and use the manufacture method of waste material and use iron
The manufacture method of liquid.Compared with the scrap feed material manufacture method of the price for depending significantly on waste material and raw material, iron liquid is used
Manufacture method is highly beneficial at the aspect of original cost, therefore, also trend is used in utilization for the main stainless steel manufacturer in the recent world
The manufacture method of iron liquid.
The waste material for typically making most of indispensable element containing stainless steels such as chromium using the stainless steel manufacture method of waste material exists
After being melted in electric furnace, by decarbonization process in refining furnace.Manufacture method using iron liquid is being implemented to be used for from from blast furnace
Iron liquid carries out decarbonization process after removing the pretreatments of impurity such as silicon, phosphorus, but is existed using the iron-smelter that carbon steel manufactures iron liquid with blast furnace
In most cases also possess the converter of decarburization, therefore, the decarburization of stainless steel is also more to be carried out using converter.
Fig. 1 is the chart illustrated for the composition of the slag to being produced when the steel refining processed of stainless steel is operated.Fig. 2
It is conventional stainless steel steel refining operational flowchart.
Operated according to conventional stainless steel steel refining, as shown in Fig. 2 10 the step of by loading iron liquid to converter, throwing
Enter auxiliary material and rise adiabator and carry out oxygen blown decarbonation process 20, input reducing agent reduction step 30 and by molten steel to
The step of ladle is tapped 40.Now, in the past, in decarbonation process 20, auxiliary material uses quick lime and light dolomite.
As shown in Figure 1, in CaO-SiO2In the case of being slag, in order to prevent the molten of at 1700 DEG C MgO systems refractory body
Go out, in theory CaO/SiO2Than being necessary for more than 1.5.Now, using fluorite or in the case where temperature is higher its than necessary
It is further up.In fact, in actual machine CaO/SiO2Used than approximately 2 ground, therefore, slag amount increases, therewith
Together, there are problems that the stripping quantity of refractory body is increased.
Prior art literature
Patent document：KR published patent document the 10-1997-0027321st
The content of the invention
Embodiments of the invention provide the stainless steel method of refining that a kind of refractory body for reducing converter corrodes, and pass through
Reduce the amount of slag and the stripping quantity of refractory body is greatly decreased such that it is able to reduce the longevity that refractory body corrodes and improves refractory body
Life, the usage amount and the usage amount of reducing agent of auxiliary material when can be greatly decreased decarburization.
The stainless steel method of refining that the refractory body for reducing converter of an embodiment of the invention corrodes includes
The step of loading iron liquid to converter, decarbonation process and reduction step, the slag formed in the decarbonation process is MgO-SiO2
It is slag.
In addition, an embodiment of the invention, the converter can internally contain refractory body, and the refractory body contains
More than any one in MgO systems and MgO-C systems.
In addition, an embodiment of the invention, the MgO/SiO of the slag2Ratio can be 1.2~1.9.
In addition, an embodiment of the invention, can include to form the MgO-SiO2It is slag and puts into pair
The step of raw material, the auxiliary material contains selected from more than any one in MgO systems and MgO-C systems.
In addition, an embodiment of the invention, MgO systems auxiliary material can be containing selected from shepardite (brucite)
More than any one in useless brick (spent brick).
In addition, an embodiment of the invention, MgO-C systems auxiliary material can be useless refractory body (spent
refractory)。
In addition, an embodiment of the invention, may further include and a liter adiabator is put into for the intensification of iron liquid
The step of, this liter of adiabator contain selected from coke and plus carbon material in any one more than.
In addition, an embodiment of the invention, described in input in the case where MgO-C systems auxiliary material is put into
When rising adiabator, the input amount of liter adiabator can be determined based on C content contained in MgO-C systems auxiliary material.
Embodiments of the invention are directed to and use quick lime and light dolomite as pair when stainless steel steel refining is operated
The situation of raw material, all prevents CaO-SiO using MgO or MgO-C systems auxiliary material2It is the generation of slag, can produces
MgO-SiO2It is slag and reduces slag amount, the stripping quantity thus, it is possible to reduce refractory body.
Further, since the input amount of auxiliary material for forming slag is reduced, therefore, can not only reduce cost and
Heat loss is few, therefore, it is favourable at the aspect for ensuring molten steel temperature, when auxiliary material uses MgO-C systems auxiliary material, work can be reduced
It is liter adiabator plus carbon material additional input amount, therefore, it is possible to reduce cost.
Brief description of the drawings
Fig. 1 is the chart illustrated for the composition of the slag to being produced when the steel refining processed of stainless steel is operated.
Fig. 2 is conventional stainless steel steel refining operational flowchart.
Fig. 3 is the stainless steel steel refining operational flowchart of one embodiment of the invention.
Symbol description
10：Iron liquid loads step
20、25：Decarbonation process
30：Reduction step
40：Molten steel tapping step
Specific embodiment
Hereinafter, embodiments of the invention are described in detail referring to the drawings.Following embodiment is for Xiang Benfa
The technical staff for having common knowledge in technical field belonging to bright fully passes on thought of the invention and points out.The present invention
The embodiment pointed out herein is not limited to, is also otherwise embodied sometimes.Accompanying drawing in order to clearly the present invention and omit with
The diagram of the part that it doesn't matter is illustrated, in order to help understand, the size of inscape can somewhat be exaggerated to show.
Fig. 3 is the stainless steel steel refining operational flowchart of one embodiment of the invention.
If reference picture 3, the stainless steel that the refractory body for reducing converter of one embodiment of the invention corrodes is refined
The step of method includes the step of loading iron liquid to converter 10, decarbonation process 25, reduction step 30 and molten steel is tapped to ladle
40.Wherein, the slag formed in above-mentioned decarbonation process 25 is MgO-SiO2It is slag.
In the present invention, in order to improve slag, for using quick lime and light dolomite conduct in conventional decarbonation process 25
Auxiliary material, all uses MgO or MgO-C systems auxiliary material.Thus, with generation CaO-SiO in the past2It is that the situation of slag is compared,
In the present invention, MgO-SiO is produced2It is slag.
If reference picture 1, in CaO-SiO2In the case of being slag, in order to prevent the molten of at 1700 DEG C MgO systems refractory body
Go out, in theory CaO/SiO2Ratio is necessary for more than 1.5.Now, using fluorite or in the case where temperature is higher its than must
Must be further up.In fact, in actual machine CaO/SiO2Ratio approximately 2 and use.
Conversely, in MgO-SiO2In the case of system, MgO/SiO2When ratio is more than 0.8, MgO refractory bodies can be suppressed
Dissolution.But, MgO/SiO2Ratio is also required to height a bit in actual machine.But, it is known that there is still a need for a small amount of MgO.That is,
For identical loading Si amounts, in the case of CaO, 1.5 times should be put into theory, but in the case of MgO, only put into 0.8 times
, therefore, with the effect that actual input amount is greatly decreased.
That is, the input amount for being used to be formed the auxiliary material of slag due to the reduction of slag amount is greatly decreased, therefore, it is possible to save
Subtract cost.Moreover, the input amount of auxiliary material is also few, therefore, in terms of heat, heat loss is also reduced and is ensuring molten steel temperature
Aspect it is highly beneficial, therefore, input amount heat up plus carbon material is used for after can not only reducing, and can be using surplus
Remaining thermal source makes the further solvent of cheap waste material.
For example, above-mentioned converter can internally contain refractory body, the refractory body contains selected from MgO systems and MgO-C systems
Any one more than.
If reference picture 2, CaO- is formed as auxiliary material using quick lime and light dolomite in decarbonation process 20
SiO2It is slag, although contain MgO systems or MgO-C systems refractory body in the inside of converter, but in CaO-SiO2It is the situation of slag
Under, with about 10% or so MgO melting degrees, therefore, cause the MgO of refractory body to the dissolution of slag, thus, produce refractory body
Erosion.
But, in MgO-SiO2In the case of being slag, because MgO has been saturation state in slag, therefore, it is possible to
Prevent the erosion of refractory body.For example, in the case of dolomite (MgO-CaO systems) refractory body containing MgO, CaO is dissolved,
Slag and CaO-SiO2Be slag it is identical and when the problems such as producing refractory body to corrode, the refractory body of converter be preferably MgO systems or
MgO-C systems refractory body.
Therefore, it is known that the slag produced in converter refining operation is MgO-SiO2When being slag, slag amount is greatly decreased
For example, the MgO/SiO of above-mentioned slag2Ratio can be 1.2~1.9.
The MgO/SiO of above-mentioned slag2Ratio be less than 1.2 when, MgO/SiO2When ratio is relatively low, there is the MgO in refractory body
The increased problem of melting loss amount of refractory body to dissolution in slag.The MgO/SiO of above-mentioned slag2When ratio is more than 1.9, there is stove
The mobility of slag declines, Cr2O3Reproducibility be relatively in a disadvantageous position, the problem of the casting yield of Cr reduction.
In decarbonation process, including in order to form above-mentioned MgO-SiO2The step of being slag and put into auxiliary material to iron liquid,
The auxiliary material is selected from more than any one in MgO systems and MgO-C systems.Hereafter, it is included in after the above-mentioned auxiliary material of input or throws
While entering auxiliary material, the step of liter adiabator is put into for the intensification of iron liquid, this liter of adiabator contain selected from coke and plus
It is more than any one in carbon material.
For example, above-mentioned MgO systems auxiliary material is not limited to this, can be containing selected from shepardite (brucite) and useless brick
More than any one in (spent brick), as long as MgO can be provided just can diversely apply.
For example, above-mentioned MgO-C systems auxiliary material is not limited to this, can be useless refractory body (spent refractory),
As long as can provide MgO-C just can diversely apply.Above-mentioned useless refractory body is used and in end-of-life in refractory body
Discarded material, consisting of 75%MgO-15%C or so, not only inexpensively, also contains C, it is highly beneficial in economic aspect.This
When, the C content of useless refractory body is not particularly limited, because can control the input amount of liter adiabator afterwards.
In the case of above-mentioned MgO-C systems auxiliary material is put into the step of above-mentioned input auxiliary material, above-mentioned intensification is put into
During material, the input amount of liter adiabator can be determined based on C content contained in above-mentioned MgO-C systems auxiliary material.
That is, when putting into MgO-C system's auxiliary materials, C input amounts in adiabator, for example plus the input amount of carbon material can be with are risen
Determine the content of C contained in auxiliary material and reduce amount corresponding with the input amount of the C by auxiliary material and put into intensification agent.Cause
This, when adding C in MgO systems as auxiliary material in the present invention, has the advantages that the input that can reduce additional plus carbon material.
Hereinafter, the present invention is illustrated in more detail by embodiment.
Embodiment and comparative example
Experiment using simulating converter (300kg Pilot decarbonizing furnaces), will with initial stage induction melting stove ( ) after the iron liquid that melts loads decarbonizing furnace, embodiment 1~3 and comparative example 1~5 according to following tables 1
Condition puts into auxiliary material, controls CaO/SiO2、MgO/SiO2And decarburization is completed, manufacture stainless steel.
[table 1]
In above-mentioned table 1, refractory body melting loss amount refers to when carrying out 1 (ch.) refining operation, from the MgO's of refractory body abjection
Stripping quantity, the casting yield of Cr refers to that removal is actually entered in molten steel in slag compared with input Cr is measured obtained from the amount of disappearance
Cr amount ratio.For the melting loss amount of refractory body, it is loaded into iron liquid and is set as once feed (charge, ch) untill tapping
And be measured.
That is, the melting loss amount melting loss speed for being meant to refer to refractory body high is fast, therefore, the lifetime of refractory body, Cr's is paid
Rate is low to mean that in the form of the Cr oxides amount disappeared in slag is more, therefore, manufacturing cost rises.
If with reference to table 1, understanding to form CaO-SiO using existing quick lime and light dolomite as comparative example2
When being slag, refractory body melting loss amount is 260~290kg/ch., very high.Conversely, being formed using useless brick as the embodiment
MgO-SiO2When being slag, refractory body melting loss amount is 160~185kg, is substantially reduced.
But, it is known that even identical MgO-SiO2It is slag, MgO/SiO2When ratio is less than 1.2, melting loss amount exceedes
200kg/ch. is higher.This means due to MgO/SiO2Ratio is low, therefore, the MgO in refractory body is relatively to molten in slag
Go out and enter.
MgO/SiO2When ratio is more than 1.9, melting loss amount diminishes, but the casting yield of Cr is reduced, for example, MgO/SiO2Ratio is
When 2.0, the casting yield of Cr is shown as 92.3%.Because slag fluidity declines and Cr2O3Reproducibility is relatively poor.
Therefore, if result is collected, understand and existing CaO-SiO2It is that slag is compared, MgO-SiO2It is slag
Refractory body melting loss amount is small, therefore, the life-span is improved, by MgO/SiO2Rate control is in 1.2~1.9 levels not only in refractory body
Life-span aspect it is important, and be also important in terms of the casting yield for ensuring Cr.The above results steel temperature 1600 processed~
1800 DEG C of scopes are derived.
It is above-mentioned that embodiment illustrated of the invention is illustrated, but the present invention is not limited to this, it can be understood as
If the technical staff with common knowledge in the technical field, then claims of above record can be not being departed from
Numerous variations and deformation are carried out in the range of concept and scope.
Claims (8)
1. the stainless steel method of refining that a kind of refractory body for reducing converter corrodes, is the step for including loading to converter iron liquid
Suddenly, the stainless steel method of refining of decarbonation process and reduction step,
Slag formed in the decarbonation process is MgO-SiO2It is slag.
2. the stainless steel method of refining that the refractory body for reducing converter according to claim 1 corrodes, its feature exists
Internally contain refractory body in, the converter, the refractory body contain selected from any one in MgO systems and MgO-C systems with
On.
3. the stainless steel method of refining that the refractory body for reducing converter according to claim 1 corrodes, its feature exists
In the MgO/SiO of the slag2Ratio is 1.2~1.9.
4. the stainless steel refining side that the refractory body for reducing converter according to any one of claims 1 to 3 corrodes
Method, it is characterised in that including in order to form the MgO-SiO2The step of being slag and put into auxiliary material, wherein described secondary former
Material contains selected from more than any one in MgO systems and MgO-C systems.
5. the stainless steel method of refining that the refractory body for reducing converter according to claim 4 corrodes, its feature exists
In MgO systems auxiliary material contains selected from more than any one in shepardite and useless brick.
6. the stainless steel method of refining that the refractory body for reducing converter according to claim 4 corrodes, its feature exists
In MgO-C systems auxiliary material is useless refractory body.
7. the stainless steel method of refining that the refractory body for reducing converter according to claim 4 corrodes, its feature exists
In the step of further include to be put into for the intensification of iron liquid liter adiabator, wherein the intensification material contains selected from coke
With plus carbon material in any one more than.
8. the stainless steel method of refining that the refractory body for reducing converter according to claim 7 corrodes, its feature exists
In, in the case where MgO-C systems auxiliary material is put into,
When input rises adiabator, the input amount of liter adiabator is determined based on C content contained in MgO-C systems auxiliary material.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020150176984A KR101739277B1 (en) | 2015-12-11 | 2015-12-11 | Method for refining stainless steel in converter with decreasing corrosion of refractory in converter |
| KR10-2015-0176984 | 2015-12-11 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106868248A true CN106868248A (en) | 2017-06-20 |
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ID=59050959
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611128252.8A Pending CN106868248A (en) | 2015-12-11 | 2016-12-09 | Reduce the stainless steel method of refining that the refractory body of converter corrodes |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP2017106109A (en) |
| KR (1) | KR101739277B1 (en) |
| CN (1) | CN106868248A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5594428A (en) * | 1979-01-13 | 1980-07-17 | Nippon Steel Corp | Preventing method for burnout of lining in furnace |
| JPH0841515A (en) * | 1994-07-27 | 1996-02-13 | Nkk Corp | Smelting method restraining erosion of refractory |
| JPH1017915A (en) * | 1996-07-02 | 1998-01-20 | Nippon Steel Corp | Converter refining method |
| JP2006241478A (en) * | 2005-02-28 | 2006-09-14 | Jfe Steel Kk | Method for operating converter |
| CN101545024A (en) * | 2009-04-30 | 2009-09-30 | 北京北科中钢工程技术有限公司 | Method for blowing desulphurized molten iron in converter |
-
2015
- 2015-12-11 KR KR1020150176984A patent/KR101739277B1/en active IP Right Grant
-
2016
- 2016-11-29 JP JP2016231097A patent/JP2017106109A/en active Pending
- 2016-12-09 CN CN201611128252.8A patent/CN106868248A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5594428A (en) * | 1979-01-13 | 1980-07-17 | Nippon Steel Corp | Preventing method for burnout of lining in furnace |
| JPH0841515A (en) * | 1994-07-27 | 1996-02-13 | Nkk Corp | Smelting method restraining erosion of refractory |
| JPH1017915A (en) * | 1996-07-02 | 1998-01-20 | Nippon Steel Corp | Converter refining method |
| JP2006241478A (en) * | 2005-02-28 | 2006-09-14 | Jfe Steel Kk | Method for operating converter |
| CN101545024A (en) * | 2009-04-30 | 2009-09-30 | 北京北科中钢工程技术有限公司 | Method for blowing desulphurized molten iron in converter |
Also Published As
| Publication number | Publication date |
|---|---|
| KR101739277B1 (en) | 2017-05-25 |
| JP2017106109A (en) | 2017-06-15 |
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