CN110172541A - A method of reducing steel-making slag - Google Patents
A method of reducing steel-making slag Download PDFInfo
- Publication number
- CN110172541A CN110172541A CN201910453182.0A CN201910453182A CN110172541A CN 110172541 A CN110172541 A CN 110172541A CN 201910453182 A CN201910453182 A CN 201910453182A CN 110172541 A CN110172541 A CN 110172541A
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- CN
- China
- Prior art keywords
- slag
- slag material
- dry slag
- steel
- dry
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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
- C21C5/30—Regulating or controlling the blowing
- C21C5/34—Blowing through the bath
-
- 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
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The present invention provides a kind of methods for reducing steel-making slag, include the following steps: to be bessemerized；Dry slag material is added, dry slag material includes magnesia and inevitable impurity；Quick grate tapping, since dry slag material being added during being bessemerized, guarantee that dry slag material is equably melted in molten steel, and dry slag material can solidify clinker, and during the tapping of quick grate, cured clinker will not be with mixing of molten steel, significantly reduce the lower quantity of slag in steelmaking process, last part molten steel can also pour simultaneously, avoid wasting, have good practicability.
Description
Technical field
Technical field of steel rolling of the present invention more particularly to a kind of method for reducing steel-making slag.
Background technique
With the increasingly raising that user requires steel product quality, need to be continuously improved steel quality, in pneumatic steelmaking, molten steel
Alloying carried out mostly in ladle, and high oxidative clinker in converter flows into that ladle will lead to molten steel and oxygen occurs for clinker
Change reaction, cause the reduction of alloying element recovery rate, and so that molten steel is generated rephosphorization, time titanium and field trash and increase.Clinker is also right simultaneously
Ladle liner generates erosion.Especially when molten steel carries out the refining treatments such as Argon, it is desirable that the slag oxidation iron content in ladle is low
Just be conducive to improve refining effect when 2%, lower quantity of slag when reducing converter tapping is to improve an important side of steel quality
Face.
Smelting Part steel grade at present enters ladle to reduce vessel slag, and molten steel is avoided to generate rephosphorization, Hui Tai, mainly
It takes and steel is stayed to operate, i.e., the molten steel for last part steel being stayed in converter, but being stayed in converter in tapping can make clinker
It can not be attached on furnace wall, influence subsequent furnace retaining, and slag before tapping, that process slag is rolled into ratio in molten steel is higher, it is difficult to
Control, causes metal charge loss and product quality deteriorates.
Summary of the invention
Technical problem to be solved by the present invention lies in overcome the deficiencies of the prior art and provide one kind to solve the prior art
The method for producing the reduction steel-making slag of steel products tapping slag technical problem.
In a general aspect, a kind of method for reducing steel-making slag is provided, is included the following steps:
It is bessemerized；
Dry slag material is added, dry slag material includes magnesia and inevitable impurity；
Quick grate tapping.
Preferably, the content of magnesia accounts for ratio >=90% of dry slag material.
Preferably, dry slag material is graininess.
Preferably, partial size is that the content of the dry slag material of 15-35mm accounts for ratio >=90% of the total content of dry slag material.
Preferably, when dry slag material is added, the total blowing oxygen ratio bessemerized is 85%~90%.
Preferably, when dry slag material is added, the additional amount of dry slag material is 700-1500Kg in every furnace.
Preferably, before the tapping of quick grate, further includes:
Reduce the flow of the gas of bottom-blowing of converter；
Stand converter.
Preferably, the time that converter is stood is 1.5-2.5min.
Preferably, the flow of the gas of bottom-blowing of converter is 200-300m3/h.
The present invention provides a kind of methods for reducing steel-making slag, since dry slag being added during being bessemerized
Material guarantees that dry slag material is equably melted in molten steel, and dry slag material can solidify clinker, taps in quick grate
During, cured clinker will not significantly reduce the lower quantity of slag in steelmaking process, while last portion with mixing of molten steel
Steel splitting water can also pour, and avoid wasting, and have good practicability.
Detailed description of the invention
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment
Attached drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for
For those of ordinary skill in the art, without creative efforts, it can also be obtained according to these attached drawings other
Attached drawing.
Fig. 1 is the flow chart of the method for reduction steel-making slag of the invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Fig. 1 is the flow chart of the method for reduction steel-making slag of the invention, as shown in Figure 1, the reduction of the present embodiment is made steel
The method of slag, comprising the following steps:
S01, it is bessemerized.
In the step S01 of the present embodiment, according to dispensing requirements, first steel scrap etc. is packed into furnace, is subsequently poured into molten iron, and
Suitable slag making materials (such as lime) is added.After charging, oxygen lance out of furnace roof insertion furnace, it is blown into hyperbaric oxygen air-flow,
Oxygen is blown into from the bottom of converter, i.e. progress bottom-blowing of converter, the purity for the oxygen being blown into is greater than 99.9%, and the oxygen being blown into can
Oxidation reaction directly occurs with the molten iron of high temperature, impurity is removed.
S02, dry slag material is added.
In the step S02 of the present embodiment, after steel-making eliminates the impurity such as titanium and phosphorus, the ingredient and temperature of molten steel are all
When reaching requirement, tapping can choose, but in order to reduce steel-making slag, dry slag material, dry slag material can then be added at this time
Including magnesia and inevitable impurity.Wherein, the content of magnesia accounts for ratio >=90% of dry slag material.Also, dry slag
Material is graininess, and partial size is that the content of the dry slag material of 15-35mm accounts for ratio >=90% of the total content of dry slag material.Oxidation
After being dissolved under hot environment of the magnesium in furnace, it can be mixed with the clinker for swimming in molten steel upper layer, so that clinker becomes sticky.
Specifically, illustrating that the removal of impurity is basic when the total blowing oxygen bessemerized is than reaching 85%~90%
It completes, steel-making has been in the second half section, and just dry slag material is added in selection, and temperature is higher in this hour wheel, it is ensured that dry slag material
It is equably melted in molten steel, and dry slag material can be mixed with clinker.
Further, according to the difference of the amount of clinker in each furnace, the additional amount for the dry slag material that can choose also not phase
Together, in the present embodiment, the additional amount of dry slag material is 700-1500Kg in every furnace.
S03, the tapping of quick grate.
In the step S03 of the present embodiment, when the ingredient of molten steel and temperature all reach requirement, it can stop blowing,
Spray gun is promoted, tapping is prepared.Furnace body is quickly shaken when tapping, makes tilting furnace, and molten steel injects in steel ladle from tapping hole, simultaneously
Deoxidier is added and carries out deoxidation and modifying ingredients.After molten steel is qualified, the casting or slab of steel can be poured into, slab can roll again
At various steel.
It is worth noting that, before the tapping of quick grate the flow of bottom-blowing of converter can also be reduced, by bottom-blowing of converter
The flow control of gas is in 200-300m3/ h, due to before tapping needing that clinker is allowed to be solidificated in one piece, if the flow mistake of blowing
Greatly, it will cause the top of the slag of clinker to fluctuate, and then influence the solidification effect of clinker, it is therefore desirable to reduce the flow of blowing, accelerate
The solidification of clinker.
Further, in order to after guaranteeing finishing blowing, clinker solidification effect before tapping, it is desirable that terminate bessemerizing
Afterwards, it stands after waiting 1.5-2.5min, is fully cured, can tap to clinker.
After the method for using the present embodiment, in the case where identical charge weight, the tap once made steel increases
2.2 tons, and the slag thickness of ladle is reduced within 55mm by average 87mm, it is seen that the method for the present embodiment is effectively reduced converter
The lower quantity of slag, improves recovery rate of iron and product quality.
To sum up, the embodiment of the invention provides a kind of methods for reducing steel-making slag, due in the mistake bessemerized
Dry slag material is added in journey, guarantees that dry slag material is equably melted in molten steel, and dry slag material can solidify clinker,
During quick grate tapping, cured clinker will not significantly reduce the lower quantity of slag in steelmaking process with mixing of molten steel,
Last part molten steel can also pour simultaneously, avoid wasting, have good practicability.
It is above-mentioned that this specification specific embodiment is described.Other embodiments are in the scope of the appended claims
It is interior.In some cases, the movement recorded in detail in the claims or step can be come according to the sequence being different from embodiment
It executes and desired result still may be implemented.In addition, process depicted in the drawing not necessarily require show it is specific suitable
Sequence or consecutive order are just able to achieve desired result.In some embodiments, multitasking and parallel processing be also can
With or may be advantageous.
It should be pointed out that for those skilled in the art, under the premise of not departing from the application principle,
Several improvements and modifications can also be made, these improvements and modifications also should be regarded as the protection scope of the application.
Claims (9)
1. a kind of method for reducing steel-making slag, which comprises the steps of:
It is bessemerized；
Dry slag material is added, the dry slag material includes magnesia and inevitable impurity；
Quick grate tapping.
2. the method according to claim 1 for reducing steel-making slag, which is characterized in that the content of the magnesia accounts for described
Ratio >=90% of dry slag material.
3. the method according to claim 2 for reducing steel-making slag, which is characterized in that the dry slag material is graininess.
4. the method according to claim 3 for reducing steel-making slag, which is characterized in that partial size is the described thick of 15-35mm
The content of slag material accounts for ratio >=90% of the total content of the dry slag material.
5. the method according to claim 1 for reducing steel-making slag, which is characterized in that when the dry slag material is added, institute
Stating the total blowing oxygen ratio bessemerized is 85%~90%.
6. the method according to claim 1 for reducing steel-making slag, which is characterized in that when the dry slag material is added, often
The additional amount of dry slag material described in furnace is 700-1500Kg.
7. the method according to claim 1 for reducing steel-making slag, which is characterized in that before the quick grate tapping,
Further include:
Reduce the flow of the gas of bottom-blowing of converter；
Stand converter.
8. the method according to claim 7 for reducing steel-making slag, which is characterized in that the time that the converter is stood is
1.5-2.5min。
9. the method according to claim 7 for reducing steel-making slag, which is characterized in that the stream of the gas of the bottom-blowing of converter
Amount is 200-300m3/h。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910453182.0A CN110172541A (en) | 2019-05-28 | 2019-05-28 | A method of reducing steel-making slag |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910453182.0A CN110172541A (en) | 2019-05-28 | 2019-05-28 | A method of reducing steel-making slag |
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| CN110172541A true CN110172541A (en) | 2019-08-27 |
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| CN201910453182.0A Pending CN110172541A (en) | 2019-05-28 | 2019-05-28 | A method of reducing steel-making slag |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102690922A (en) * | 2012-06-13 | 2012-09-26 | 鞍钢股份有限公司 | Method for reducing aluminum oxide inclusions in silicon-aluminum-containing killed steel subjected to vacuum treatment |
| CN103205524A (en) * | 2013-04-15 | 2013-07-17 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for smelting low-sulfur steel from semi-steel |
| CN103789483A (en) * | 2014-02-17 | 2014-05-14 | 攀钢集团攀枝花钢钒有限公司 | Method for smelting low-phosphorus steel by using semi-steel |
| CN106086594A (en) * | 2016-07-28 | 2016-11-09 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of preparation method of Ti IF steel |
-
2019
- 2019-05-28 CN CN201910453182.0A patent/CN110172541A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102690922A (en) * | 2012-06-13 | 2012-09-26 | 鞍钢股份有限公司 | Method for reducing aluminum oxide inclusions in silicon-aluminum-containing killed steel subjected to vacuum treatment |
| CN103205524A (en) * | 2013-04-15 | 2013-07-17 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for smelting low-sulfur steel from semi-steel |
| CN103789483A (en) * | 2014-02-17 | 2014-05-14 | 攀钢集团攀枝花钢钒有限公司 | Method for smelting low-phosphorus steel by using semi-steel |
| CN106086594A (en) * | 2016-07-28 | 2016-11-09 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of preparation method of Ti IF steel |
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Application publication date: 20190827 |
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