CN101906508A - Aluminum-calcium deoxidizing agent and preparation method thereof - Google Patents
Aluminum-calcium deoxidizing agent and preparation method thereof Download PDFInfo
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- CN101906508A CN101906508A CN 201010253959 CN201010253959A CN101906508A CN 101906508 A CN101906508 A CN 101906508A CN 201010253959 CN201010253959 CN 201010253959 CN 201010253959 A CN201010253959 A CN 201010253959A CN 101906508 A CN101906508 A CN 101906508A
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- deoxidizer
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Abstract
The invention relates to the technical field of metallurgy, in particular to an aluminum-calcium deoxidizing agent and a preparation method thereof. The deoxidizing agent is a ball-shaped composition prepared from powder of aluminum powder, calcium powder, premelting calcium aluminate powder and the like. By virtue of the components as well as shapes and sizes thereof and balled shapes of the composition, in the using process, the deoxidizing agent has the advantages that the calcium powder, the calcium powder and the premelting calcium aluminate powder are pressed into balls, and the preparation method is simple; the strength of a finished product is high, and the finished product can be directly used by the overhead bin of a steel factory; the reduction capability is high, the deoxidizing capability on molten steel is strong, and the total oxygen content of the molten steel is low when compared with the same type of deoxidizing agents; a deoxidizing product grows by mutual accumulation, and quickly floats up, the content of inclusion in the steel is reduced, and the inclusion is modified simultaneously; and the flowability of molten steel is good when in casting.
Description
Technical field
The invention belongs to metallurgical technology field, relate to and utilize metallic aluminium powder, metallic calcium powder and fritting calcium aluminate powder compacting balling-up.In converter, electric furnace steel tapping process or add in the refining processs such as RH, LF, molten steel is carried out deoxidation.
Background technology
Metallic aluminium generally uses in converter or electrosmelting tapping process as a kind of deep deoxidation agent, and its good deoxy performance has obtained everybody approval, and present used aluminium deoxidizer has metal aluminium ingot, ferro-aluminum etc., but the Al that produces after its deoxidation
2O
3Solid inclusion can be present in the molten steel in a large number, is difficult for come-up, if in smelting technology after this not with its removal, nozzle clogging in the time of not only can causing continuous casting, and can reduce the mechanical property and the machinability of Finished Steel.In order to eliminate Al in the molten steel
2O
3The defective that inclusion causes feeds CaSi cored-wire or calcium line in recent years in ladle before continuous casting of molten steel, make Al in the molten steel
2O
3Solid inclusion becomes 12CaO7Al under the effect of calcium metal
2O
3Float on the liquid phase in the slag of top, or make Al
2O
3Irregular inclusion modification is a nodule.But the calcium line utilization ratio is low and cost is high, and the CaSi alloy wire is same with high costs and can cause molten steel to increase Si.
Summary of the invention
The objective of the invention is according to above-mentioned the deficiencies in the prior art part, a kind of Al-Ca deoxidizer and preparation method are provided, this reductor is the composition of the ball shape that constituted by pulvis such as metallic aluminium powder, metallic calcium powder and fritting calcium aluminate powders, the combined composition of said composition and shape size thereof, and shape after the balling-up, make this reductor in use thoroughly avoid the deficiencies in the prior art.
The object of the invention realizes being finished by following technical scheme:
A kind of Al-Ca deoxidizer, it is characterized in that described Al-Ca deoxidizer is made up of metallic aluminium powder, metallic calcium powder and fritting calcium aluminate powder, wherein the shared weight percent of metallic aluminium powder is 40% – 70%, and the shared weight percent of metallic calcium powder is 8% – 28%, and all the other are the fritting calcium aluminate powder.
Can contain additive in the described Al-Ca deoxidizer, this additive accounts for the 5%-15% of described Al-Ca deoxidizer gross weight, and described additive is the combination of a kind of in barium powder, silica flour, rare earth material, the magnesium powder or at least two kinds.
The granularity of described metallic aluminium powder, metallic calcium powder, fritting calcium aluminate is not more than 6mm.
Also can contain weight percent in the described Al-Ca deoxidizer and be no more than 3% water-insoluble binding agent, this binding agent is the combination of a kind of in resene, pitch, paraffin, the rosin or at least two kinds.
The shape of described Al-Ca deoxidizer is the spherule after the compression moulding.
A kind of production method of Al-Ca deoxidizer is characterized in that, the metallic aluminium powder, metallic calcium powder and the fritting calcium aluminate powder that granularity are not more than 6mm mix, and behind abundant stirring and evenly mixing, is pressed into spherule.
Advantage of the present invention is: metallic aluminium powder, metallic calcium powder and fritting calcium aluminate powder compacting balling-up, and the preparation method is easy; The product intensity height directly enters steel mill's high hopper and uses; Possess strong reducing power, strong to the deoxidation of molten steel ability, to compare with similar reductor, the molten steel total oxygen content is low; Deoxidation products is built up mutually and is grown up, and the deoxidation products come-up is fast, and inclusion content of steel reduces, and can make inclusion modification simultaneously; Good fluidity during molten steel casting, the mouth of a river does not have dross.
Embodiment
Embodiment 1:(table 1)
| Feed composition | Granularity (mm) | %(weight) |
| Metallic aluminium powder | 0~2 | 40 |
| Metallic calcium powder | 0~2 | 8 |
| The fritting calcium aluminate powder | 0~2 | 52 |
With raw material by said components and granularity compacting balling-up after, balling ratio reaches 98%, 2m is high freely drop down onto the cement flooring greater than 10mm account for 98%, smooth in appearance, highly polished.
(table 2)
| Feed composition | Granularity (mm) | %(weight) |
| Metallic aluminium powder | 0~4 | 40 |
| Metallic calcium powder | 0~4 | 8 |
| The fritting calcium aluminate powder | 0~4 | 52 |
With raw material by said components and granularity compacting balling-up after, balling ratio reaches 96%, 2m is high freely drop down onto the cement flooring greater than 10mm account for 97%, outward appearance is more smooth, smooth finish is higher.
(table 3)
| Feed composition | Granularity (mm) | %(weight) |
| Metallic aluminium powder | 0~6 | 40 |
| Metallic calcium powder | 0~6 | 8 |
| The fritting calcium aluminate powder | 0~6 | 52 |
With raw material by said components and granularity compacting balling-up after, balling ratio reaches 95%, 2m is high freely drop down onto the cement flooring greater than 10mm account for 96%, outward appearance is more smooth.
After said components compacting balling-up, deoxidation when being used for converter tapping is used when smelting AFT011 steel grade in certain steel mill, press the adding of 2.5kg/t molten steel after, the gained result is as follows:
Add the preceding oxygen 25ppm of back argon.Compare with former reductor, oxygen level has reduced 3ppm in the molten steel.Site environment is pollution-free.Fluidity molten steel is good, and the mouth of a river does not have dross.
In the test of above-mentioned adding reductor, the reductor that we have selected the pulvis of above-mentioned three kinds of size ranges to suppress respectively carries out above-mentioned test, and the result shows, in deoxidation process, product of the present invention after the compacting balling-up, wherein the globule size of component is not seen notable difference to deoxidation effect.
Embodiment 2:
| Feed composition | Granularity (mm) | %(weight) |
| Metallic aluminium powder | 0~6 | 45 |
| Metallic calcium powder | 0~6 | 12 |
| The fritting calcium aluminate powder | 0~6 | 43 |
After said components compacting balling-up, deoxidation when being used for converter tapping is used when smelting AFT011 steel grade in certain steel mill, press the adding of 2.5kg/t molten steel after, the gained result is as follows:
Add the preceding oxygen 22ppm of back argon.Compare with former reductor, oxygen level has reduced 6ppm in the molten steel.Site environment is pollution-free.Fluidity molten steel is good, and the mouth of a river does not have dross.
Embodiment 3:
| Feed composition | Granularity (mm) | %(weight) |
| Metallic aluminium powder | 0~6 | 50 |
| Metallic calcium powder | 0~6 | 16 |
| The fritting calcium aluminate powder | 0~6 | 34 |
After said components compacting balling-up, deoxidation when being used for converter tapping is used when smelting AFT011 steel grade in certain steel mill, press the adding of 2.5kg/t molten steel after, the gained result is as follows:
Add the preceding oxygen 20ppm of back argon.Compare with former reductor, oxygen level has reduced 8ppm in the molten steel.Site environment is pollution-free.Fluidity molten steel is good, and the mouth of a river does not have dross.
Embodiment 4:
| Feed composition | Granularity (mm) | %(weight) |
| Metallic aluminium powder | 0~6 | 60 |
| Metallic calcium powder | 0~6 | 20 |
| The fritting calcium aluminate powder | 0~6 | 20 |
After said components compacting balling-up, deoxidation when being used for converter tapping is used when smelting AFT011 steel grade in certain steel mill, press the adding of 2.5kg/t molten steel after, the gained result is as follows:
Add the preceding oxygen 17ppm of back argon.Compare with former reductor, oxygen level has reduced 11ppm in the molten steel.Site environment is pollution-free.Fluidity molten steel is good, and the mouth of a river does not have dross.
Embodiment 5:
| Feed composition | Granularity (mm) | %(weight) |
| Metallic aluminium powder | 0~6 | 70 |
| Metallic calcium powder | 0~6 | 25 |
| The fritting calcium aluminate powder | 0~6 | 5 |
After said components compacting balling-up, deoxidation when being used for converter tapping is used when smelting AFT011 steel grade in certain steel mill, press the adding of 2.5kg/t molten steel after, the gained result is as follows:
Add the preceding oxygen 15ppm of back argon.Compare with former reductor, oxygen level has reduced 13ppm in the molten steel.Site environment is pollution-free.Fluidity molten steel is good, and the mouth of a river does not have dross.
The present invention uses in the process of ladle in converter or electric furnace steel tapping, directly joins in the ladle to mix towards deoxidation with molten steel.
The present invention almost is applicable to all aluminium killed steels.Also can add the steel grade that combinations a kind of or at least two kinds in barium powder, silica flour, rare earth material, the magnesium powder are used to have particular requirement in the present invention, as rare earth steel etc.Also can adopt binding agents such as adding non-water-soluble resin class, pitch, paraffin, rosin in the present invention compacting balling-up (to reduce production costs) to be used for, as straight carbon steel etc. to the less demanding steel grade of molten steel purity.
Claims (6)
1. Al-Ca deoxidizer, it is characterized in that described Al-Ca deoxidizer is made up of metallic aluminium powder, metallic calcium powder and fritting calcium aluminate powder, wherein the shared weight percent of metallic aluminium powder is 40% – 70%, and the shared weight percent of metallic calcium powder is 8% – 28%, and all the other are the fritting calcium aluminate powder.
2. a kind of Al-Ca deoxidizer according to claim 1, it is characterized in that to contain additive in the described Al-Ca deoxidizer, this additive accounts for the 5%-15% of described Al-Ca deoxidizer gross weight, and described additive is the combination of a kind of in barium powder, silica flour, rare earth material, the magnesium powder or at least two kinds.
3. a kind of Al-Ca deoxidizer according to claim 1 is characterized in that the granularity of described metallic aluminium powder, metallic calcium powder, fritting calcium aluminate powder is not more than 6mm.
4. a kind of Al-Ca deoxidizer according to claim 1, it is characterized in that also can containing in the described Al-Ca deoxidizer weight percent and be no more than 3% water-insoluble binding agent, this binding agent is the combination of a kind of in resene, pitch, paraffin, the rosin or at least two kinds.
5. a kind of Al-Ca deoxidizer according to claim 1, the shape that it is characterized in that described Al-Ca deoxidizer is the spherule after the compression moulding.
6. the production method of an Al-Ca deoxidizer is characterized in that, the metallic aluminium powder, metallic calcium powder and the fritting calcium aluminate powder that granularity are not more than 6mm mix, and behind abundant stirring and evenly mixing, is pressed into spherule.
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| CN 201010253959 CN101906508A (en) | 2010-08-16 | 2010-08-16 | Aluminum-calcium deoxidizing agent and preparation method thereof |
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| CN 201010253959 CN101906508A (en) | 2010-08-16 | 2010-08-16 | Aluminum-calcium deoxidizing agent and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112828279A (en) * | 2020-12-31 | 2021-05-25 | 昆明理工大学 | Metal powder gas phase deoxidation method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1394968A (en) * | 2002-08-26 | 2003-02-05 | 谢廷声 | Compound deoxidant for solid steel |
| CN1955317A (en) * | 2005-10-25 | 2007-05-02 | 上海盛宝钢铁冶金炉料有限公司 | Aluminium compound deoxider |
-
2010
- 2010-08-16 CN CN 201010253959 patent/CN101906508A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1394968A (en) * | 2002-08-26 | 2003-02-05 | 谢廷声 | Compound deoxidant for solid steel |
| CN1955317A (en) * | 2005-10-25 | 2007-05-02 | 上海盛宝钢铁冶金炉料有限公司 | Aluminium compound deoxider |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112828279A (en) * | 2020-12-31 | 2021-05-25 | 昆明理工大学 | Metal powder gas phase deoxidation method |
| CN112828279B (en) * | 2020-12-31 | 2022-08-12 | 昆明理工大学 | Metal powder gas phase deoxidation method |
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Address after: Baoshan District Shidongkou 200942 Shanghai Road No. 1 Applicant after: Shanghai Shengbao Metallurgical Technology Co., Ltd. Address before: Baoshan District Shidongkou 200942 Shanghai Road No. 1 Applicant before: Shanghai Shengbao Iron & Steel Metallurgical Furance Charge Co., Ltd. |
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Application publication date: 20101208 |