CN110106313A - A kind of refining slag and its methods for making and using same - Google Patents
A kind of refining slag and its methods for making and using same Download PDFInfo
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- CN110106313A CN110106313A CN201910361047.3A CN201910361047A CN110106313A CN 110106313 A CN110106313 A CN 110106313A CN 201910361047 A CN201910361047 A CN 201910361047A CN 110106313 A CN110106313 A CN 110106313A
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- Prior art keywords
- slag
- refining slag
- refining
- calcite
- powder
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Classifications
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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
- C21C5/36—Processes yielding slags of special composition
-
- 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
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/076—Use of slags or fluxes as treating agents
-
- 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
- C21C2005/366—Foam slags
-
- 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)
- Treatment Of Steel In Its Molten State (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The invention discloses a kind of refining slag and its methods for making and using same, each component mass percents of the refining slag are as follows: calcite in powder 52.7% ~ 72.7%, alumina powder 27.3% ~ 47.3%, surplus are impurity；The refining slag the preparation method is as follows: weigh calcite and alumina powder in proportion, and process and be ground to particle size range in 0 ~ 3mm；Obtained calcite in powder and alumina powder are mixed, binder is added in whipping process and forms pressure ball material；Balling-up is suppressed using ball press, is toasted after sieving, finally obtains the refining slag；The refining slag, which can quickly form slag with the mixed punching of molten steel or be added in refining furnace, quickly forms foamed slag in molten steel surface.The invention has the advantages that bringing a certain amount of CO into the form of calcite2,Foamed slag can be quickly formed in the case where being added without foaming agent and carries out arc-covering slag operation, and formed foamed slag has high alkalinity, high cleanliness, take off S for low-oxygen steel molten steel, de- O provides good thermodynamics and kinetics condition.
Description
Technical field
The present invention relates to metallurgical technology fields, and in particular to a kind of refining slag and its methods for making and using same.
Background technique
Due to the limitation of raw material and production technology, SiO in original preliminary melting type calcium aluminate refining slag2Content is difficult to accomplish 3%
Hereinafter, the SiO in slag when smelting low-oxygen steel2Refining basicity of slag is not only reduced, but also aoxidizes metallic aluminium increase molten steel oxygen in steel and contains
Amount, the Si after reduction, which enters, influences molten steel composition in steel.
Due to existing in original preliminary melting type calcium aluminate refining slag without gas, initial stage is refined in LF furnace although melting slagging speed
Comparatively fast, but in the presence of reactive blowing agent foamed slag cannot be formed in time to guarantee arc-covering slag operation.
Summary of the invention
According to the deficiencies of the prior art described above, It is an object of the present invention to provide a kind of refining slag and its preparation and answer
With method, the refining slag is by choosing calcite and aluminium oxide as raw material, and high pressure compacting balling-up, obtains after processing is pulverized
Component proportion is calcite in powder 52.7% ~ 72.7%, and the refining slag of alumina powder 27.3% ~ 47.3% utilizes side in use
A certain amount of CO that Xie Shi is brought into2,, quickly form foamed slag and carry out arc-covering slag operation, and formed foamed slag has high alkalinity, height
Degree of purity takes off S for low-oxygen steel molten steel, de- O provides good thermodynamics and kinetics condition.
The object of the invention realization is completed by following technical scheme:
A kind of refining slag, it is characterised in that each component mass percent of the refining slag is as follows: 52.7% ~ 62.7%, aluminium oxide
Powder 27.3% ~ 47.3%, surplus are impurity.
The refining slag is in ellipsoid particle, having a size of 25mm × 45mm.
CaCO in the calcite in powder3Content is greater than 99%, the Al in the alumina powder2O3Content is greater than 99%.
The particle size range of the calcite in powder and the alumina powder is 0 ~ 3mm.
It is a kind of to be related to the preparation method of any refining slag of claim 1-4, it is characterised in that the preparation method
The following steps are included: weighing calcite and alumina powder in proportion, and processes and be ground to particle size range in 0 ~ 3mm；By what is obtained
Calcite in powder and alumina powder are mixed evenly, and binder is added in whipping process and forms pressure ball material；Using pressure
The pressure ball material is suppressed balling-up by ball machine, is toasted obtained ellipsoid particle after vibrating screen is sieved, is finally obtained
The refining slag.
The additive amount of the binder is no more than the 8% of the pressure ball material gross mass.
Toast the sphere method particularly includes: the sphere for obtaining compacting, which is packed into, toasts small car, is transported to tunnel
It is toasted in road kiln, baking temperature is 100-130 DEG C, and baking time is 10-12 hours.
It is a kind of to be related to the application method of any refining slag of claim 1-4, it is characterised in that the application method
Are as follows: in converter tapping, the refining slag is added in ladle and the mixed punching of molten steel quickly forms refining slag slag, is mentioned for molten steel
For the molten slag layer of good fluidity.
The mass percent of each component is as follows in the refining slag slag: CaO 38.5% ~ 58.5%, Al2O3 41.5%~
61.5%, SiO2< 0.5%, basicity CaO/SiO2> 40.
It is a kind of to be related to the application method of any refining slag of claim 1-4, it is characterised in that the application method
Are as follows: the refining slag is added in refining furnace, in the case where being added without foaming agent, refining initial stage is quickly formed in molten steel surface
Foamed slag carries out arc-covering slag operation.
The invention has the advantages that bringing a certain amount of CO into the form of calcite2,It can be in the feelings for being added without foaming agent
Foamed slag is quickly formed under condition and carries out arc-covering slag operation, and formed foamed slag has high alkalinity, high cleanliness, is low-oxygen steel molten steel
De- S, de- O provide good thermodynamics and kinetics condition.
Specific embodiment
Feature of the invention and other correlated characteristics are described in further detail by the following examples, in order to go together
The understanding of industry technical staff:
Embodiment: the present embodiment is specifically related to a kind of refining slag and its methods for making and using same, which is solved by selection side
Stone and aluminium oxide are as raw material, high pressure compacting balling-up after processing is pulverized, obtain component proportion be calcite in powder 52.7% ~
72.7%, the refining slag of alumina powder 27.3% ~ 47.3%, a certain amount of CO brought into use using calcite2,, fastly
Speed formation foamed slag carries out arc-covering slag operation, and formed foamed slag has high alkalinity, high cleanliness, takes off S for low-oxygen steel molten steel, takes off
O provides good thermodynamics and kinetics condition.
The each component and its mass percent of refining slag in the present embodiment are as follows: calcite in powder 52.7% ~ 72.7%, oxidation
Aluminium powder 27.3% ~ 47.3%, surplus are impurity, wherein the CaCO in calcite in powder3Content is greater than 99%, and in alumina powder
Al2O3Content is greater than 99%, and SiO in impurity2Content also require less than 1%, to ensure the degree of purity of finished product.In the present embodiment
The oval spherical particle of refining slag, having a size of 25mm × 45mm, granularity always, convenient for the rapid melting in molten steel.In addition,
Raw material use calcite in powder and alumina powder particle size range in 0 ~ 3mm, thus make the refining slag produced at
Divide uniformly, convenient for the rapid melting in molten steel.Using 801 glue, additive amount is no more than binder in the present embodiment
The 8% of pressure ball material gross mass, with being mixed into for strict control other impurities.
Refining slag in the present embodiment the preparation method is as follows:
(1) CaCO is selected3Content is greater than 99% calcite and Al2O3Alumina powder of the content greater than 99% is and right as raw material
Raw material are pre-processed, and calcite and alumina powder are milled through flour mill, form calcite of the particle size range in 0 ~ 3mm
Powder and alumina powder, it is ensured that object agglomeration dampness phenomenon.
(2) according to the component proportion relationship of the refining slag of setting, calcite in powder and alumina powder are weighed respectively.
(3) blender is opened, load weighted calcite in powder and alumina powder are added in blender and are stirred, is being stirred
Binder is uniformly added into during mixing, the time that blender is mixed controlled at 8-10 minutes, it is ensured that each material is sufficiently mixed
Uniformly, pressure ball material is formed, wherein the additive amount of binder is no more than the 8% of pressure ball material gross mass.
(4) ball press is opened, the pressure ball material being stirred is pressed into oval spherical particle, is then sieved through through vibrating
Sieve, screens out remaining fine powder, obtains the semi-finished product having a size of 25mm × 45mm.
(5) semi-finished product of acquisition are packed into and toast small car, and be transported to tunnel oven and toasted, control baking temperature is
100-130 DEG C, baking time be 10-12 hours, to obtain each component content are as follows: 52.7% ~ 62.7%, alumina powder 27.3%
~ 47.3%, surplus is the refining slag of impurity, and impurity SiO in obtained refining slag2Content is no more than 1%.
A kind of application method of refining slag in the present embodiment are as follows:
In converter tapping, the refining slag of said components is added in ladle, due to this refining slag fusing point be 1500 DEG C ±
50 DEG C, and the calcium carbonate in calcite is 900 DEG C by the temperature for thermally decomposing to yield calcium oxide and carbon dioxide, is being added to steel
After in water and the mixed punching of molten steel more rapidly forms refining slag slag, each component mass percent of obtained refining slag slag are as follows:
CaO 38.5% ~ 58.5%, Al2O341.5% ~ 61.5%, SiO2< 0.5%, for molten steel deoxidation, desulfurization provide one it is good
Dynamic conditions.
In steelmaking process, basicity, that is, CaO/SiO of metallurgical cinder2The size of value is to influence the heat of desulfurization, deoxidation effect
Mechanical condition index, basicity is bigger, then deoxidation, desulfurization effect are better.Steel-making white slag (Al common at present2O3: 15% ± 5%；
MgO < 10%；CaO/SiO2> 2.5), only 3.0 or so, and after basicity is greater than 5.0, the fusing point of white slag will be greater than basicity
1550 DEG C, slag can not be formed in molten steel surface, reduce metallurgical effect；And another common steelmaking aluminum acid calcium refining slag
(Al2O3: 38% ± 5%；CaO:48% ± 5%；MgO < 10%；SiO2> 3%), although promote desulfurization, deoxidation effect be better than it is white
Slag, but due to SiO in slag2> 3%, basicity is often 10 hereinafter, be unable to satisfy the steel grade very low to [O], [S] content requirement
Smelting requirements, and the SiO in slag2[Si], [Al] are will affect in steel.
And the refining slag in this implementation be added molten steel in after formed refining slag slag basicity up to 40 or more, and
SiO in slag2Content less than 0.5%, making steel at 1500 DEG C or so by the fusing point of the refining slag slag obtained in compositional range
It is not only that molten steel provides the molten slag layer of good fluidity in journey, also provides good thermodynamics for deoxidation, desulfurization in smelting process
Condition achievees the effect that depth deoxidation, desulfurization, [O], [S] in steel can be dropped to 10ppm or less；Further, since SiO in slag2Contain
< 0.5% is measured, under the premise of guaranteeing good deoxidation, desulfurization effect, SiO in slag2It is anti-that molten steel generation redox will not be entered
[Al], [Si] component content should be influenced in steel.
Another application method of refining slag in the present embodiment are as follows:
The refining slag of said components is added in LF refining furnace, brings a certain amount of CO into the form of calcite2, thus in LF essence
In the case that furnace refining initial stage is added without foaming agent, heated decompose rapidly of calcite in powder in refining slag generates calcium oxide and two
Carbonoxide so that quickly forming foamed slag carries out arc-covering slag operation, and is formed by foamed slag with high alkalinity, high cleanliness
Advantage can provide good thermodynamics and kinetics condition, and SiO in slag for desulfurization, the deoxidation of low-oxygen steel molten steel2It will not be into
Enter molten steel and [Al], [Si] component content in redox reaction influence steel occurs.
For further verify this implementation refining slag component and its proportion relation refining slag during LF refining is taken off
The influence of oxygen, desulfurization effect present embodiments provides following groups sample, and the component proportion relationship in each group sample (presses quality
Percentage calculates) it is as shown in table 1 below.
Table 1:
Sample data in upper table 1 actually uses it can be seen from situation when each group distribution ratio in refining slag is in the present embodiment
Component proportion within the scope of, i.e., calcite in powder content is between 52.7% ~ 62.7% and alumina powder content is 27.3% ~ 47.3%
Between when, [S] content and [O] content after the application refining slag carries out LF refining in steel are decreased obviously, desulfurization, deoxidation effect
Fruit is substantially better than white slag and preliminary melting type calcium aluminate refining slag；Wherein 4 desulfurization of sample, deoxidation effect are best, and [S] content is only in steel
0.0059%, [O] content is only 0.0051%；But when calcite in powder content or alumina powder content be not in the present embodiment component model
When enclosing interior or calcite in powder content and alumina powder content not in the present embodiment compositional range when, the desulfurization of refining slag,
Deoxidation effect is obviously deteriorated, and [S] content after LF refining in steel and [O] content obviously rise, with conventional use of white slag and
The using effect of preliminary melting type calcium aluminate refining slag is very nearly the same.
The beneficial effect of the present embodiment is: bringing a certain amount of CO into the form of calcite2,Foaming can be added without
Foamed slag is quickly formed in the case where agent and carries out arc-covering slag operation, and formed foamed slag has high alkalinity, high cleanliness, is hypoxemia
Steel molten steel takes off S, de- O provides good thermodynamics and kinetics condition.
Claims (10)
1. a kind of refining slag, it is characterised in that each component mass percent of the refining slag is as follows: calcite in powder 52.7% ~
62.7%, alumina powder 27.3% ~ 47.3%, surplus is impurity.
2. a kind of refining slag according to claim 1, it is characterised in that the refining slag is in ellipsoid particle, having a size of
25mm×45mm。
3. a kind of refining slag according to claim 1, it is characterised in that the CaCO in the calcite in powder3Content is greater than
99%, the Al in the alumina powder2O3Content is greater than 99%.
4. a kind of refining slag according to claim 1, it is characterised in that the grain of the calcite in powder and the alumina powder
Spending range is 0 ~ 3mm.
5. a kind of be related to the preparation method of any refining slag of claim 1-4, it is characterised in that the preparation method packet
It includes following steps: weighing calcite and alumina powder in proportion, and process and be ground to particle size range within 0 ~ 3mm；It will obtain
Calcite in powder and alumina powder be mixed evenly, in whipping process be added binder formed pressure ball material；Using
The pressure ball material is suppressed balling-up by ball press, toasts obtained ellipsoid particle after vibrating screen is sieved, final
To the refining slag.
6. a kind of preparation method of refining slag according to claim 5, it is characterised in that the additive amount of the binder is not
More than the 8% of the pressure ball material gross mass.
7. a kind of preparation method of refining slag according to claim 5, it is characterised in that toast the specific side of the sphere
Method are as follows: the sphere for obtaining compacting, which is packed into, toasts small car, is transported in tunnel oven and is toasted, baking temperature 100-
130 DEG C, baking time is 10-12 hours.
8. a kind of be related to the application method of any refining slag of claim 1-4, it is characterised in that the application method are as follows:
In converter tapping, the refining slag is added in ladle and the mixed punching of molten steel quickly forms refining slag slag, provides stream for molten steel
The dynamic good molten slag layer of property.
9. a kind of application method of refining slag according to claim 8, it is characterised in that each group in the refining slag slag
The mass percent divided is as follows: CaO 38.5% ~ 58.5%, Al2O341.5% ~ 61.5%, SiO2< 0.5%, basicity CaO/SiO2>
40。
10. a kind of be related to the application method of any refining slag of claim 1-4, it is characterised in that the application method
Are as follows: the refining slag is added in refining furnace, in the case where being added without foaming agent, refining initial stage is quickly formed in molten steel surface
Foamed slag carries out arc-covering slag operation.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110453044A (en) * | 2019-08-14 | 2019-11-15 | 上海盛宝冶金科技有限公司 | A kind of method of preparation and use of furnace steel refining slag |
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| CN1170763A (en) * | 1997-05-19 | 1998-01-21 | 具龙善 | Method for producing refining flux in steel making and use |
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| CN110453044A (en) * | 2019-08-14 | 2019-11-15 | 上海盛宝冶金科技有限公司 | A kind of method of preparation and use of furnace steel refining slag |
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