KR20110062027A - Slag deoxidizer - Google Patents
Slag deoxidizer Download PDFInfo
- Publication number
- KR20110062027A KR20110062027A KR1020090118595A KR20090118595A KR20110062027A KR 20110062027 A KR20110062027 A KR 20110062027A KR 1020090118595 A KR1020090118595 A KR 1020090118595A KR 20090118595 A KR20090118595 A KR 20090118595A KR 20110062027 A KR20110062027 A KR 20110062027A
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- KR
- South Korea
- Prior art keywords
- slag
- molten steel
- deoxidizer
- aluminum
- present
- Prior art date
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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
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0087—Treatment of slags covering the steel bath, e.g. for separating slag from the molten metal
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- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The present invention relates to a slag deoxidizer, characterized in that the inside is made of metal aluminum and the outside is coated with a molten oxide made of Al 2 O 3 to suppress the deoxidation reaction with molten steel.
The slag deoxidizer according to the present invention can reduce the amount of aluminum introduced by improving the slag deoxidation efficiency, thereby reducing the cost, and ensuring the oxygen concentration in the molten steel, thereby reducing the operation of forced oxygen injection during vacuum treatment, and stabilizing operation of molten steel. Prevents quality deterioration and has the advantage of improving the life of the refractory.
Description
The present invention relates to a slag deoxidizer, and more particularly, to a slag deoxidizer which prevents direct contact between metallic aluminum and molten steel to improve deoxidation efficiency of slag and prevents quality degradation of ultra low carbon steel.
When the molten steel is produced in the steelmaking process, the molten iron or scrap is first refined in a converter or an electric furnace, and then the molten steel is transferred to a steel ladle for secondary refining. At this time, the slag containing a large amount of iron oxide from the converter or the electric furnace flows into the steel ladle to reduce the error rate of the ferroalloy used in the deoxidation and to promote the oxidation of the alloying elements in the molten steel to generate non-metallic inclusions in the molten steel.
Therefore, it is desirable to lower the iron oxide in the slag of the steel ladle as much as possible. To this end, there are attempts to prevent the slag from being mixed into the converter ladles, or to inject a large amount of subsidiary material into the spilled slag, to dilute it, or to remove the slag and to form the slag again. It is not large and has disadvantages of economic disadvantage.
Therefore, in general, a method of reducing iron oxide of hydrogel using a slag deoxidizer containing metal aluminum is widely used. Slag deoxidizers include aluminum dross, which is a by-product of aluminum production, or briquette type deoxidizers formed by mixing CaO or CaCO 3 with powder or aluminum dross to increase reaction efficiency. .
Aluminum dross contains some metallic aluminum in its composition, mixed with other aluminum oxides and nitrides, extremely uneven particle size, and contains a large amount of fine powder, which makes it difficult to inject it using a hopper. The molten steel is deoxidized. Briquette-type deoxidizer has the advantage that can be added because it is a molded body, but also has a problem that the molten steel is deoxidized by the exposed aluminum because it is configured in the form of a mixture.
In particular, in the case of producing ultra low carbon steel, since the desired carbon concentration cannot be obtained from the converter, it is necessary to perform decarburization by vacuum treatment using oxygen remaining in the steel.
The present invention was devised to improve the above problems, and provides a slag deoxidizer that can prevent direct contact between metal aluminum and molten steel, thereby improving slag deoxidation efficiency and preventing slag quality deterioration. The purpose is to provide a deoxidizer.
The slag deoxidizer according to the present invention for achieving the above object is characterized in that the inside is made of metal aluminum, the outside is coated with a molten oxide made of Al 2 O 3 to suppress the deoxidation reaction with molten steel.
The slag deoxidizer according to the present invention can reduce the amount of aluminum introduced by improving the slag deoxidation efficiency, thereby reducing the cost, and ensuring the oxygen concentration in the molten steel, thereby reducing the operation of forced oxygen injection during vacuum treatment, and stabilizing operation of molten steel. Prevents quality deterioration and has the advantage of improving the life of the refractory.
Hereinafter, the slag deoxidizer according to the present invention with reference to the accompanying drawings in more detail.
Since the slag deoxidizer according to the present invention has an oxide layer on the surface even when it is in contact with molten steel at the time of injection, when the oxide on the surface is melted by the reaction with slag when not floating with the molten steel, the inner metal aluminum is exposed. And reacts with the iron oxide in the slag. Therefore, the reaction with oxygen in the molten steel hardly occurs and only reacts with the iron oxide in the slag.
At this time, the oxide on the surface of the metal aluminum is appropriate to control the composition range to be melted at 1600 ℃ or less of the molten steel temperature of the steel ladle. This is because if the melting point is higher than the ionicity, the molten metal is not melted in the slag layer and thus it is difficult to expect the exposure of the metal aluminum. In addition, considering the speed of goods, the premelting type is more preferable.
On the other hand, the composition of the oxide layer on the surface is appropriate to the composition of the ladle slag, which is to minimize the variation of the ladle slag composition to prevent the change in refining capacity.
Therefore, as the slag deoxidizer that satisfies the above conditions, as shown in FIG. 1, the inner molten oxide of Al 2 O 3 system is similar to the ladle slag composition having a melting point of 1600 ° C. or less. When the slag deoxidizer composed of the
Although the present invention has been described with reference to the embodiments illustrated in the drawings, these are merely exemplary, and it will be understood by those skilled in the art that various modifications and equivalent embodiments thereof are possible.
Therefore, the true scope of protection of the present invention should be defined only by the appended claims.
1 is a cross-sectional view of the slag deoxidizer according to the present invention.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020090118595A KR20110062027A (en) | 2009-12-02 | 2009-12-02 | Slag deoxidizer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020090118595A KR20110062027A (en) | 2009-12-02 | 2009-12-02 | Slag deoxidizer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| KR20110062027A true KR20110062027A (en) | 2011-06-10 |
Family
ID=44396283
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR1020090118595A KR20110062027A (en) | 2009-12-02 | 2009-12-02 | Slag deoxidizer |
Country Status (1)
| Country | Link |
|---|---|
| KR (1) | KR20110062027A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102296151A (en) * | 2011-08-22 | 2011-12-28 | 辽宁天和科技股份有限公司 | Pre-melted slag with composite structure |
| CN107641682A (en) * | 2017-09-20 | 2018-01-30 | 安阳金源冶金材料有限责任公司 | A kind of steel-making aluminum-steel hybrid deoxidation alloying agent and preparation method thereof |
-
2009
- 2009-12-02 KR KR1020090118595A patent/KR20110062027A/en not_active Application Discontinuation
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102296151A (en) * | 2011-08-22 | 2011-12-28 | 辽宁天和科技股份有限公司 | Pre-melted slag with composite structure |
| CN107641682A (en) * | 2017-09-20 | 2018-01-30 | 安阳金源冶金材料有限责任公司 | A kind of steel-making aluminum-steel hybrid deoxidation alloying agent and preparation method thereof |
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