CN108300836A - A kind of double deoxidizer - Google Patents
A kind of double deoxidizer Download PDFInfo
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- CN108300836A CN108300836A CN201810161576.4A CN201810161576A CN108300836A CN 108300836 A CN108300836 A CN 108300836A CN 201810161576 A CN201810161576 A CN 201810161576A CN 108300836 A CN108300836 A CN 108300836A
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- carbonate
- magnesium
- double deoxidizer
- deoxidizer
- inorganic agent
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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
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/06—Deoxidising, e.g. killing
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- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The present invention provides a kind of converter, refining furnace steel-making novel deoxidizer for use, the double deoxidizer includes carbonate, basic anhydride, expanded graphite and magnesium inorganic agent, and the magnesium inorganic agent is Inactivate granular magnesium.The double deoxidizer of the present invention can form many small slag drops in converter tapping station, LF refining furnace station smelting process, the oxide quickly generated with deoxidation reacts to form compound, form deslagging process, carbonate and expanded graphite, which are heated, simultaneously can release bubble, inclusion floating can be adhered to, reach purification molten steel, improves the purpose of quality.
Description
Technical field
The present invention relates to pneumatic steelmaking fields, more particularly to deoxidation of molten steel and inclusion removal.
Background technology
Non-metallic inclusion in steel is mainly the change of the formation such as the metallic elements such as iron, manganese, chromium, aluminium, titanium and oxygen, sulphur, nitrogen
Close object.Wherein oxide is mainly deoxidation products, including fail float a deoxidation products and solidification of molten steel during again
The deoxidation products that deoxygenation (secondary oxidation) is formed occurs；Or caused by the clinker due to being mixed into steel, refractory material etc..
The presence of non-metallic inclusion destroys the continuity of steel matrix, causes the uneven of structure of steel, can be produced to the various performances of steel
Raw certain influence, such as reduce the intensity and toughness of steel.Non-metallic inclusion is mainly sulfide (MnS, FeS etc.), oxide
(FeO、MnO、CaO、Al2O3Deng), silicate and nitride (TiN, AlN) etc..
Chinese patent application CN105950826A discloses a kind of ladle refining furnace refining slag deoxidier and its application method,
The refining slag deoxidier includes following component：CaCO3：10~30%, Al2O3：30~60%, Al：10~35%, it is other：≤
5%, it is mass percent.By the way that refining slag deoxidier of the present invention is added in ladle refining furnace slagging process so that refining
Slag has the ability of higher desulfurization and dross inclusion adsorption, and TFe+MnO ＜ 1% after slag making.
Chinese patent application CN102344992A discloses a kind of double deoxidizer used in steel-making, the complex deoxidization
The chemical composition mass percent of agent is：Si >=14%, Ca >=14%, Al >=25%, P≤0.06%, S≤0.08%, As≤
0.10%, Pb≤0.01%.The application method of the double deoxidizer is：In tapping process, when starting tapping toward molten steel
Middle to be added above-mentioned double deoxidizer, based on Adding Way is mainly thrown with hand, addition requires to be added according to following standard：Converter goes out
When steel carbon ＞ 0.06%, double deoxidizer addition presses 1.8-2.0kg/t steel；Converter tapping carbon is between 0.04-0.06%
When, the high addition of double deoxidizer presses 2.0-2.2kg/t steel；When converter tapping carbon ＜ 0.04%, double deoxidizer addition is pressed
2.2-2.4kg/t steel.
But in the technical solution involved by patent application above-mentioned, all refer in all kinds of technical problems being noted above
It needs to overcome.
Invention content
For problems of the prior art, the present invention provides a kind of new double deoxidizers, and provide accordingly
The method for preparing double deoxidizer.
Present invention firstly provides a kind of new double deoxidizer, the double deoxidizer includes carbonate, alkaline oxygenated
Object, expanded graphite and magnesium inorganic agent, the carbonate are calcium carbonate, and the basic anhydride are calcium oxide, the magnesium inorganic agent
For Inactivate granular magnesium.
As a kind of better choice of above-mentioned double deoxidizer, at the carbonate, basic anhydride, expanded graphite and magnesium
The mass ratio for managing agent is 20-30：20-30：35-45：4-8.It can not also influence to smelt containing other in double deoxidizer miscellaneous
The impurity smelted is not influenced containing 7% in matter, such as double deoxidizer.
As a kind of better choice of above-mentioned double deoxidizer, the carbonate is magnesium carbonate or calcium carbonate.The carbonic acid
When salt is generally heated at 1500 degree Celsius or less, carbonate can be broken, and decomposed and discharged tiny CO2Bubble, same adherency folder
Sundries floats.
As a kind of better choice of above-mentioned double deoxidizer, the content of carbonate is in the NEW TYPE OF COMPOSITE deoxidier
20-30wt%.The carbonate can provide in such a way：Carbonate is milled first, is then granulated.According to aforementioned side
The carbonate expanded by heating that formula obtains becomes little particle one by one, participates in reaction, according to metallurgical transmission theory, all reactions are all
It is the dissociation of large particulate matter, followed by macromolecular, to small molecule, atom or atomic group, particle can participate in reacting, this
Dissociation can rapidly be expanded by inventing the carbonate in the double deoxidizer provided, participate in reaction, being capable of shape after carbonate is heated
It is dripped at many small slags, the oxide that can be quickly generated with deoxidation reacts to form compound, plays the purpose of wash heat.Carbonic acid
When salt is generally heated at 1500 degree Celsius or less, carbonate can be broken, and decomposed and discharged tiny CO2Bubble, same adherency folder
Sundries floats.
As a kind of better choice of above-mentioned double deoxidizer, the basic anhydride are magnesia, magnesium carbonate, calcium oxide
Or calcium carbonate.
As a kind of better choice of above-mentioned double deoxidizer, the allowance for expansion rate of the expanded graphite is 150-200mL/
g.Carbon in the present invention in double deoxidizer is the larger graphite of allowance for expansion rate, graphite is crushed to 500 mesh, using mechanization
Reaction principle is learned, with the synthesis such as carbonate, existence form is the form of lamellar graphite fine particle.The advantages of carbon deoxidation is de-
Oxygen amount is larger the aluminium deoxidation amount of 1kg (amount of the carbon deoxidation of 1kg be more than), and the product after deoxidation is small CO bubbles, Neng Goucong
Molten steel is not polluted in effusion among molten steel, while CO bubbles are from when the effusion of molten steel centre, additionally it is possible to adhere to the folder among molten steel
Sundries floats, removal of inclusions.NEW TYPE OF COMPOSITE deoxidier feature is heated rapidly decomposition later, and disperse is as multiple after decomposition
Little particle is spread, and rapidly participates in the deoxidation of molten steel, compared with industrial calcium carbide, the influence of deoxidation speed and the carburetting for molten steel
It is superior to industrial calcium carbide.
As a kind of better choice of above-mentioned double deoxidizer, the basic anhydride are calcium oxide, the expanded graphite
Allowance for expansion rate be 150-200mL/g, the magnesium inorganic agent be Inactivate granular magnesium；The carbonate, basic anhydride, expansion stone
The mass ratio of ink and magnesium inorganic agent is 23：23：41：6, other impurity for being 7%.
In the present invention, Inactivate granular magnesium is added in NEW TYPE OF COMPOSITE deoxidier, can be with oxidation reactive aluminum, formation in molten steel
The smaller magnesium aluminate spinel of grain, while being attached on CO2It floats on bubble or in Argon Bubble.Even if this type impurity can not on
It is floating, it stays among molten steel, harmfulness is also small many compared with aluminate.
The mechanism that deoxidation is carried out using the double deoxidizer of the present invention is as follows：
Bubble size is tiny in molten steel can increase itself and field trash collision probability, improve the removal efficiency of field trash；Carefully
The presence of small slag drop has the function of wash heat.The expanded graphite added in product can be with the freedom among molten steel after heated
Oxygen or Fu Shi bodies (iron oxide) reaction, form CO bubbles, can either deoxidation, and the minute bubbles for sticking field trash can be formed,
Be conducive to the purification of molten steel.By introducing carbonate in molten steel, carbonate can generate small in molten steel after being thermally decomposed
CO2Bubble, minute bubbles are not only able to keep molten steel component and temperature uniform, and by the capture of bubble, suction-operated, directly
Removal of inclusions.
Present invention can be implemented in converter tapping station, LF refining furnace station smelting processes, can form many small slag drops,
The oxide quickly generated with deoxidation reacts to form compound, forms deslagging process, while carbonate and the heated meeting of expanded graphite
Bubble is released, inclusion floating can be adhered to, reaches purification molten steel, improves the purpose of quality.
Specific implementation mode
The embodiment of the present invention is the following is, explanation of the invention is used only as and not limits.
Following embodiment provides a kind of new double deoxidizer, including carbonate, basic anhydride, expanded graphite and
Magnesium inorganic agent, the carbonate are calcium carbonate, and the basic anhydride are calcium oxide, and the magnesium inorganic agent is Inactivate granular magnesium；Institute
The mass ratio for stating carbonate, basic anhydride, expanded graphite and magnesium inorganic agent is 20-30：20-30：35-45：4-8.It is compound de-
The impurity that other are 7% in the impurity smelted, such as double deoxidizer can not also be influenced in oxygen agent containing other.
Carbonate can also use magnesium carbonate, and corresponding basic anhydride can also be magnesia, magnesium carbonate, hydrochloric acid calcium,
But contain magnesium raw material for using, the effect consistent with corresponding calcic raw material can be obtained, but can obviously improve enterprise
Cost, therefore, only using carbonate as calcium carbonate, basic anhydride illustrate following embodiment for calcium oxide.
In the raw material that following examples use, the carbonate, basic anhydride, expanded graphite and magnesium inorganic agent quality
Than being 23：23：41：6, other impurity for being 7%.Certainly, the carbonate, basic anhydride, expanded graphite and magnesium inorganic agent
Mass ratio may be 20-30：20-30：35-45：4-8 can obtain better skill under the premise of providing compared with pure raw material
Art effect.
The process that deoxidation is carried out using the deoxidier of the present invention is as follows：
(1) converter tapping starts, and the molten steel in ladle reaches 10t or so, is initially added into NEW TYPE OF COMPOSITE deoxidier, and be added
Steel-core-aluminium, alloy and slag auxiliary material lime etc..
(2) measure tap in molten steel 4/5ths add before.If the tapping hole of converter is bigger than normal, can increase
Enter speed, molten steel has gone out, and stops being added；
(3) usage amount suggestion：Converter tapping endpoint carbon content W [C]<0.10%, 2kg is added in ton steel；W[C]>0.10%,
Ton steel usage amount 1.5kg；
(4) forbid this product ladle bottom is disposably added, the operating method then tapped, prevent molten steel boiling acute
It is strong, cause safety accident.
(5) deoxidation during LF refining is mainly diffusive deoxidation and the adjustment of ingredient.In the process, using novel multiple
Deoxidier is closed, the basicity of clinker can be improved rapidly, formed conducive to foamed slag, keeps furnace atmosphere, while intermediate content of magnesium has
The basicity and viscosity for helping rapidly increase clinker, are conducive to smelting operation and the protection of ladle slag line.
Application method is identical as using the method for calcium carbide during LF refining, and equivalent is replaced.
Using NEW TYPE OF COMPOSITE deoxidier deoxidation, have the following advantages：
(1) molten steel tapping is to 10t, and after addition, fragmentation of being heated becomes N number of fine particle, and expanded graphite carbon therein participates in carbon
The reaction of deoxidation generates the CO/CO of disperse2Bubble floating.Carbonate among sphere forms N number of small slag drop, becomes wash heat steel
The best deoxidation substance of liquid；
(2) since aluminium deoxidation speed is far longer than the speed of carbon deoxidation, after steel-core-aluminium addition, what deoxygenation generated
The Al of small and dispersed2O3Particle can be adhered to the CO/CO of deoxidation generation2The surface of bubble is floated, and the Al of disperse is conducive to2O3It goes
It removes；
(3) the small slag drop that the carbonate among sphere is formed, the Al that can be generated with aluminium deoxidation2O3Particle reaction is formed low
The calcium-aluminate of fusing point is conducive to removal of floating；
(4) current research has shown that, the desulphurization reaction of molten steel, the product CaS of desulphurization reaction, is and 12CaO7Al2O3Shape
At compound 11CaO7Al2O3Then CaS floats, according to the principle of chemical reaction equilibrium movement it is found that novel using oxygen
Double deoxidizer is conducive to the progress of desulphurization reaction；
(5) compared with calcium carbide, the storage of this product has original advantage using upper, without security risk, in deoxidation effect
On, it is better than the deoxidation effect of calcium carbide；
(6) use this product among steel manufacturing procces, the ton steel cost of steel-making can be reduced；
(7) this product is used, and the operation of the Argon and Calcium treatment wire feeding process that can reduce process for making removal of inclusions is difficult
Degree, promotes the quality of molten steel.
It should be noted last that the above examples are only used to illustrate the technical scheme of the present invention and are not limiting.Although ginseng
It is described the invention in detail according to embodiment, it will be understood by those of ordinary skill in the art that, to the technical side of the present invention
Case is modified or replaced equivalently, and without departure from the spirit and scope of technical solution of the present invention, should all be covered in the present invention
Right in.
Claims (6)
1. a kind of double deoxidizer, it is characterised in that：The double deoxidizer includes carbonate, basic anhydride, expanded graphite
With magnesium inorganic agent, the magnesium inorganic agent is Inactivate granular magnesium.
2. double deoxidizer as described in claim 1, which is characterized in that the carbonate, basic anhydride, expanded graphite and
The mass ratio of magnesium inorganic agent is 20-30：20-30：35-45：4-8.
3. double deoxidizer as described in claim 1, which is characterized in that the carbonate is magnesium carbonate or calcium carbonate.
4. double deoxidizer as described in claim 1, which is characterized in that the basic anhydride are magnesia, magnesium carbonate, oxygen
Change calcium or calcium carbonate.
5. double deoxidizer as described in claim 1, which is characterized in that the allowance for expansion rate of the expanded graphite is 150-
200mL/g。
6. double deoxidizer as described in claim 1, it is characterised in that the basic anhydride are calcium oxide, the expansion stone
The allowance for expansion rate of ink is 150-200mL/g, and the magnesium inorganic agent is Inactivate granular magnesium；The carbonate, basic anhydride, expansion
The mass ratio of graphite and magnesium inorganic agent is 23：23：41：6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810161576.4A CN108300836B (en) | 2018-02-27 | 2018-02-27 | Composite deoxidizer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810161576.4A CN108300836B (en) | 2018-02-27 | 2018-02-27 | Composite deoxidizer |
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| Publication Number | Publication Date |
|---|---|
| CN108300836A true CN108300836A (en) | 2018-07-20 |
| CN108300836B CN108300836B (en) | 2020-01-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810161576.4A Active CN108300836B (en) | 2018-02-27 | 2018-02-27 | Composite deoxidizer |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110331255A (en) * | 2019-08-09 | 2019-10-15 | 王强 | A kind of precipitation desoxydation method of carbon aluminium-killed steel |
| CN111850238A (en) * | 2020-07-23 | 2020-10-30 | 芜湖县天海耐火炉料有限公司 | Deoxidizer for smelting metal waste residues and preparation method thereof |
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| CN102827999A (en) * | 2011-06-14 | 2012-12-19 | 鞍钢股份有限公司 | Magnesium deoxidation composite powder for molten steel deoxidation and preparation method thereof |
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| CN102827999A (en) * | 2011-06-14 | 2012-12-19 | 鞍钢股份有限公司 | Magnesium deoxidation composite powder for molten steel deoxidation and preparation method thereof |
| CN105177223A (en) * | 2015-08-25 | 2015-12-23 | 新疆中合大正商贸有限公司 | Process of using magnesia-calcium-carbon balls in LF steel making |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110331255A (en) * | 2019-08-09 | 2019-10-15 | 王强 | A kind of precipitation desoxydation method of carbon aluminium-killed steel |
| CN110331255B (en) * | 2019-08-09 | 2020-11-20 | 王强 | Precipitation deoxidation method of low-carbon aluminum killed steel |
| CN111850238A (en) * | 2020-07-23 | 2020-10-30 | 芜湖县天海耐火炉料有限公司 | Deoxidizer for smelting metal waste residues and preparation method thereof |
| CN111850238B (en) * | 2020-07-23 | 2021-11-02 | 芜湖县天海耐火炉料有限公司 | Deoxidizer for smelting metal waste residues and preparation method thereof |
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| Publication number | Publication date |
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| CN108300836B (en) | 2020-01-17 |
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