CN1804055A - Premelting slag for RH vacuum treatment deep desulfurization of ultra low carbon steel - Google Patents
Premelting slag for RH vacuum treatment deep desulfurization of ultra low carbon steel Download PDFInfo
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- CN1804055A CN1804055A CNA2005100232692A CN200510023269A CN1804055A CN 1804055 A CN1804055 A CN 1804055A CN A2005100232692 A CNA2005100232692 A CN A2005100232692A CN 200510023269 A CN200510023269 A CN 200510023269A CN 1804055 A CN1804055 A CN 1804055A
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- 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
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
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Abstract
The RH vacuum treatment deep desulfurization premelting slag for ultra-low-carbon steel comprises: 48~56% CaO, 33~43% Al2O3, 0.2~5.0% MgO, 2.5~6.0% SiO2, TiO2<=1.9, C<=0.05 and impurity, and is prepared by electric melting the material of super 60-65% limestone and 35-40% Al2O3 powder (Al-content more than 96%). This invention improves desulfurization capacity, produces Ca(AlO2)2 convenient to preserving, and has little corrosion to RH groove.
Description
(1) technical field
The present invention relates to make steel SECONDARY REFINING IN A VACUUM CHAMBER, relate in particular to used for ultra-low-carbon steel RH vacuum treatment deep desulfurization pre-melted slag and preparation method thereof.
(2) background technology
Chinese patent 98101510.7 discloses a kind of aluminium-contained premelting slag and preparation method thereof and has contained the molten steel desulfurizer and the scavenging agent of this slag.This invention will contain the aluminium slag and put into metallurgic furnace, heating make contain the aluminium slag molten clear after, add AlF
3, CaF
2, CaCl
2Or AlCl
3In any one or more, continue heating, when melt temperature surpasses 1450 ℃, add SiO
2With the MgO slag supplying agent, carry out residue adjustment according to final slag composition; The composition of the aluminium-contained premelting slag that obtains is (weight %): metal A l 12～15%, Al
2O
365～75%, SiO
22～10%, MgO
2～6%, AlF
3Or CaF
2Or CaCl
2Or AlCl
3In any one or more 3～10%.Above-mentioned aluminium-contained premelting slag and CaO, CaC
2, CaCO
3, can be made into dissimilar aluminium-contained premelting slag sweetening agents behind the mixing such as C.Mix with Si-Fe, BaO or mixed rare-earth oxide by this aluminium-contained premelting slag of direct use or at above-mentioned aluminium-contained premelting slag, obtain dissimilar aluminium-contained premelting slag slag purification of molten steel agent.The aluminium-contained premelting slag of this patent not with the lime fritting interior, because the fusing point of lime is higher, use the back that merely pre-melted slag of this patent and lime is mixed, fusing time is longer in refining process, be unfavorable for quick slagging, reduced sweetening power, and should include the bigger fluorite (CaF of the anti-material erosion of RH vacuum tank in the existing patent pre-melted slag
2), simultaneously carbon content is not offered some clarification on the unclear desulfurizing and refining that can be used in ultra low-carbon steel.Aluminium-contained premelting slag that should existing patent not with the lime fritting interior, do not possess desulfurizing function, if mix use with lime etc., be unfavorable for again preserving, can the very easy moisture absorption because contain the slag charge of lime by mechanically mixing, be difficult for preserving, not only can reduce the ability of desulfurization, and easily make molten steel increase hydrogen ((H)), influence the quality of steel.
(3) summary of the invention
The object of the present invention is to provide a kind of used for ultra-low-carbon steel RH vacuum treatment deep desulfurization pre-melted slag and preparation method thereof, it not only with the direct fritting of lime in refining slag, make the refining slag of fritting possess desulfurizing function, simultaneously owing to generated calcium aluminate after the fritting, be difficult for the moisture absorption, be easy to preserve.This pre-melted slag is because fusing point is low, and slagging speed is fast, and desulfuration efficiency is higher, and is smaller to the erosion of the RH cell body magnesia chrome brick of anti-the material.
The present invention is achieved in that a kind of used for ultra-low-carbon steel RH vacuum treatment deep desulfurization pre-melted slag, and its composition is (weight percent %): CaO 48～56, Al
2O
333～43, MgO 0.2～5.0, SiO
22.5～6.0, TiO
2≤ 1.9, C≤0.05, all the other are impurity.
The preparation method of used for ultra-low-carbon steel RH vacuum treatment deep desulfurization pre-melted slag, its raw material is fine Wingdale and high-purity AL
2O
3Powder (contains AL
2O
3Be more than 96%), its proportioning is: Wingdale/high-purity AL
2O
3Powder=(60%～65%)/(35%～40%) adopts electric furnace electric smelting method to produce preparation.
The preparation method of above-mentioned used for ultra-low-carbon steel RH vacuum treatment deep desulfurization pre-melted slag, described electric furnace is a three-phawse arc furnace, adopt the electric arc heat of three root graphite electrodes that raw material is melted, the fusing of margin limit is reinforced, melting finishes the back and has a power failure earlier, and till the body of heater water coolant continued to be cooled to slag charge and all solidifies, the high temperature slag charge took out in body of heater, and an amount of water spray, make slag charge be crushed to desired particle size after cracking and the cooling automatically.
The present invention through repeatedly RH vacuum refinement process slag system is optimized and slag system to RH cell body magnesia chrome brick and the hot test of the soaking tub high alumina erosive of anti-the material, and the physicals of slag system studied.Carry out the production of pre-melted slag then by the electric smelting method, the used for ultra-low-carbon steel RH vacuum treatment deep desulfurization pre-melted slag of producing, its composition is (weight percent %): CaO 48～56, Al
2O
333～43, MgO 0.2～5.0, SiO
22.5～6.0, TiO
2≤ 1.9, C≤0.05, all the other are impurity.Compare with existing patent " aluminium-contained premelting slag ", the present invention not only with the direct fritting of lime in bits, make bits directly possess the function of desulfurization, simultaneously owing to generated calcium aluminate after the fritting, be difficult for the moisture absorption, be easy to preserve, and the fusing point of this pre-melted slag low (＜1325 ℃), slagging speed is fast, desulfuration efficiency is higher, especially carbon content very low (＜0.05%) can be used in ultra low-carbon steel (the RH vacuum treatment deep desulfurization of C＜50ppm), and smaller to the erosion of the RH cell body magnesia chrome brick of anti-the material.
(4) embodiment
A kind of used for ultra-low-carbon steel RH vacuum treatment deep desulfurization pre-melted slag, its composition is (weight percent %): CaO 48～56, Al
2O
333～43, MgO 0.2～5.0, SiO
22.5～6.0, TiO
2≤ 1.9, C≤0.05, all the other are impurity.
The preparation method of used for ultra-low-carbon steel RH vacuum treatment deep desulfurization pre-melted slag is: raw material is selected fine Wingdale and high-purity AL for use
2O
3Powder (contains AL
2O
3Be more than 96%) etc., main proportioning is: Wingdale/high-purity AL
2O
3Powder=(60%～65%)/(35%～40%).Adopt these two kinds of raw materials to guarantee product purity, especially carbon and TiO
2Deng having obtained strong control for the very deleterious material of ultra low-carbon steel.The raw material of common pre-melted slag is Wingdale and bauxite chamotte then, the lime that adopts common shaft furnace or rotary kiln to fire, and carbon content is than higher, and is difficult to the control ratio of carbon, and the bauxite chamotte impurities is more, is difficult to guarantee as TiO
2Deng control to high added value ultra low-carbon steel smelting objectionable impurities.The present invention adopts electric furnace electric smelting method to produce, and production unit adopts three-phawse arc furnace, and furnace shell is made with the Plate Steel welding, the outside water-cooling pattern that adopts, and the inwall lining-less forms water-cooled dross furnace wall.Furnace bottom has the carbon brick of a layer thickness greater than 200mm, repaves the about 150mm raw material of a bed thickness above.Body of heater and furnace bottom adopt and divide body structure.Utilize the electric arc heat of three root graphite electrodes that raw material is melted, to reach the fritting purpose.Because the central section Arc Temperature can reach the high temperature of four, 5,000 degree, therefore melt Wingdale and the high purity aluminium oxide powder is very fast, production efficiency is than higher.Adopt the reinforced mode in fusing of margin limit to produce in the production process, when beginning to produce for the ease of the starting the arc, can around three electrodes, add a small amount of electrode fragment or iron pin, when furnace charge reach the electric stove hearth height 3/4 the time, melting finishes, have a power failure earlier, but the body of heater water coolant continues to keep being cooled to slag charge all solidify till.Take out from body of heater, and spray water slightly in right amount, the pyritous slag is cracking automatically, is crushed to institute's palpus granularity after the cooling.The characteristics of this method are the arc temperature height, and the slag charge fusing is even, the composition control stabilization.If necessary, can suitably transform,, improve the production preparative capacibility of pre-melted slag to realize continuous charging, continuous melting and the function of slagging tap continuously to electric furnace.
Concrete using method: used for ultra-low-carbon steel RH vacuum treatment deep desulfurization pre-melted slag usage quantity is generally steel 3.0～3.5kg per ton, and be equipped with ton fat lime of steel 1.0～1.5kg, can suitably adjust this proportioning and consumption according to the requirement of desulfurization and the basicity of slag.The granularity general requirement is 3～10mm, can reduce as the excessive slagging speed that then melts of granularity.
Operational requirement to converter tapping and RH operation is as follows in use:
The converter operation
(1) the converter tapping temperature is improving about 15 ℃ on the primary standard basis, to compensate the temperature drop that the desulfurization of RH vacuum is caused;
(2) ladle slag upgrading: the top of the slag reductors such as aluminium bits that in ladle, add 500kg aluminium slag (Al=50%) or equivalent after the tapping immediately.
Refining RH operation
(1) the decarburization operation is carried out in the RH vacuum-treat earlier, carries out deoxidation with aluminum shot after the decarburization, carries out alloying after the deoxidation;
(2) alloying finishes the back and adds pre-melted slag sweetening agent and fat lime, adds in three batches, and the every batch of interval 1 minute keeps the condition of high vacuum degree state when reinforced, and is if can continuous charging then better.In the process that the pure degassing is handled, carry out circulation desulfurization;
(3) consider that the desulfurization of RH vacuum-treat pre-melted slag causes the loss of molten steel aluminium, according to existing experience, the loss of aluminium should be supplied this part aluminium when therefore being made into part aluminium and decrease about 0.01～0.015% in the molten steel.
(4) the pure degassing time of RH vacuum-treat needs proper extension 3～5 minutes, allows pre-melted slag and molten steel increase the fully time of reaction, to improve desulfuration efficiency more further.
Embodiment:
Used for ultra-low-carbon steel RH vacuum treatment deep desulfurization pre-melted slag is after reality is used, and its sweetening effectiveness is referring to table 1.
Table 1 test-results data gather
| The test sequence number | Original [S] * 10 -6 | Finished product [S] * 10 -6 | Desulfurization degree % |
| 1 | 46 | 30 | 34.8 |
| 2 | 40 | 30 | 25.0 |
| 3 | 46 | 32 | 30.4 |
| 4 | 42 | 27 | 35.7 |
| 5 | 32 | 22 | 31.3 |
| 6 | 41 | 26 | 36.6 |
| 7 | 33 | 26 | 21.2 |
| 8 | 43 | 36 | 16.0 |
| 9 | 44 | 32 | 27.3 |
| On average | 40.8 | 29 | 28.7 |
The major ingredient (weight percent %) (all the other for impurity) of testing used pre-melted slag is referring to table 2,
The major ingredient of the used pre-melted slag of table 2 test
| Corresponding test sequence number | The prescription of used pre-melted slag (%) | |||||
| CaO | Al 2O 3 | MgO | SiO 2 | TiO 2 | C | |
| 1、2 | 49.5 | 39.5 | 1.25 | 5.50 | 1.30 | ≤0.05 |
| 3、4 | 51.8 | 33.1 | 0.26 | 2.83 | 1.19 | ≤0.05 |
| 5、6、7 | 55.1 | 37.8 | 0.40 | 3.84 | 1.47 | ≤0.05 |
| 8、9 | 48.2 | 40.5 | 4.51 | 3.38 | 1.83 | ≤0.05 |
According to the test-results shown in the table 1, average original sulphur content before the RH vacuum-treat only is under the low-sulfur condition of 40.8ppm, and the RH vacuum treatment deep desulfurization pre-melted slag of the application of the invention takes off average sulfur about 29ppm, average desulfurization degree reaches 28.7%, and low-sulfur takes off to 22ppm.More than use the result to handle ultra low-carbon steel as RH, stay oxygen 500～700ppm to be used for the dark decarburization of RH at the converter tapping molten steel, under the relatively poor situation of the desulfurization thermodynamic condition of molten steel after the decarburization and top slag, lower (under＜50ppm) the prerequisite in the original sulphur content of RH molten steel, use pre-molten deep desulfurizer of the present invention can obtain higher desulfurization degree, and when using this pre-molten deep desulfurizer to handle ultra low-carbon steel, erosion to the RH cell body magnesia chrome brick of anti-the material is smaller, though and big slightly to the erosion comparison cell body magnesia chrome brick of RH soaking tub high alumina castable, other non-pre-melted desulfurizing agent is much smaller to the erosion degree of RH soaking tub than using.The carbon content of pre-melted desulfurizing agent of the present invention very low (＜0.05%) can effectively be controlled the increase of carbon in the ultra low-carbon steel molten steel, for the desulfurization of ultra low-carbon steel, has very high practicality.And use this used for ultra-low-carbon steel RH vacuum treatment deep desulfurization pre-melted slag that ultra low-carbon steel is carried out dark desulfurization, can control the inclusion in the steel effectively, through to the molten steel sampling analysis after the desulfurization of RH pre-molten deep desulfurizer, find that the inclusion of steel grade mainly is the Al of different shape and size class
2O
3Inclusion, its size more than 95% less than 5 μ m.
Claims (3)
1. used for ultra-low-carbon steel RH vacuum treatment deep desulfurization pre-melted slag, it is characterized in that the composition of pre-melted slag is (weight percent %): CaO 48～56, Al
2O
333～43, MgO 0.2～5.0, SiO
22.5～6.0, TiO
2≤ 1.9, C≤0.05, all the other are impurity.
2. the preparation method of the described used for ultra-low-carbon steel RH of claim 1 a vacuum treatment deep desulfurization pre-melted slag is characterized in that raw material is fine Wingdale and high-purity AL
2O
3Powder (contains AL
2O
3Be more than 96%), its proportioning is: Wingdale/high-purity AL
2O
3Powder=(60%～65%)/(35%～40%) adopts electric furnace electric smelting method to produce preparation.
3. the preparation method of used for ultra-low-carbon steel RH vacuum treatment deep desulfurization pre-melted slag according to claim 2, it is characterized in that electric furnace is a three-phawse arc furnace, adopt the electric arc heat of three root graphite electrodes that raw material is melted, the fusing of margin limit is reinforced, melting finishes the back and has a power failure earlier, and till the body of heater water coolant continued to be cooled to slag charge and all solidifies, the high temperature slag charge took out in body of heater, and water spray slightly in right amount, make slag charge automatically be crushed to desired particle size after cracking and the cooling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2005100232692A CN1804055A (en) | 2005-01-12 | 2005-01-12 | Premelting slag for RH vacuum treatment deep desulfurization of ultra low carbon steel |
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|---|---|---|---|
| CNA2005100232692A CN1804055A (en) | 2005-01-12 | 2005-01-12 | Premelting slag for RH vacuum treatment deep desulfurization of ultra low carbon steel |
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Cited By (9)
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|---|---|---|---|---|
| CN101928809A (en) * | 2009-06-22 | 2010-12-29 | 鞍钢股份有限公司 | Modification method of RH molten steel refining ladle slag |
| CN101649371B (en) * | 2009-08-26 | 2011-06-15 | 武汉科技大学 | Desulfurating agent for out-of-furnace treatment and preparation method thereof |
| CN101838720B (en) * | 2009-03-16 | 2011-11-30 | 上海梅山钢铁股份有限公司 | Composite modification material for reducing oxidizability of molten low-carbon-aluminum killed steel |
| CN102399941A (en) * | 2010-09-07 | 2012-04-04 | 鞍钢股份有限公司 | Calcium aluminate for desulfurization of ultra-low titanium and carbon steel and preparation method thereof |
| CN103373854A (en) * | 2012-04-20 | 2013-10-30 | 上海梅山钢铁股份有限公司 | Large-surface repairing material for converter and preparation method of large-surface repairing material |
| CN104726644A (en) * | 2015-03-23 | 2015-06-24 | 河北钢铁股份有限公司承德分公司 | RH vacuum refining desulfurization method |
| CN104946855A (en) * | 2015-07-15 | 2015-09-30 | 武汉钢铁(集团)公司 | Vacuum treatment method for high-aluminum ultralow-carbon steel |
| CN110106313A (en) * | 2019-04-30 | 2019-08-09 | 上海盛宝冶金科技有限公司 | A kind of refining slag and its methods for making and using same |
| CN111621619A (en) * | 2020-06-03 | 2020-09-04 | 马鞍山市兴达冶金新材料有限公司 | Desulfurizer for reducing corrosion of RH refractory material and preparation process thereof |
-
2005
- 2005-01-12 CN CNA2005100232692A patent/CN1804055A/en active Pending
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| CN101838720B (en) * | 2009-03-16 | 2011-11-30 | 上海梅山钢铁股份有限公司 | Composite modification material for reducing oxidizability of molten low-carbon-aluminum killed steel |
| CN101928809A (en) * | 2009-06-22 | 2010-12-29 | 鞍钢股份有限公司 | Modification method of RH molten steel refining ladle slag |
| CN101928809B (en) * | 2009-06-22 | 2013-12-11 | 鞍钢股份有限公司 | Modification method of RH molten steel refining ladle slag |
| CN101649371B (en) * | 2009-08-26 | 2011-06-15 | 武汉科技大学 | Desulfurating agent for out-of-furnace treatment and preparation method thereof |
| CN102399941A (en) * | 2010-09-07 | 2012-04-04 | 鞍钢股份有限公司 | Calcium aluminate for desulfurization of ultra-low titanium and carbon steel and preparation method thereof |
| CN102399941B (en) * | 2010-09-07 | 2014-04-02 | 鞍钢股份有限公司 | Preparation method of calcium aluminate for desulfurization of ultra-low titanium and carbon steel |
| CN103373854A (en) * | 2012-04-20 | 2013-10-30 | 上海梅山钢铁股份有限公司 | Large-surface repairing material for converter and preparation method of large-surface repairing material |
| CN104726644A (en) * | 2015-03-23 | 2015-06-24 | 河北钢铁股份有限公司承德分公司 | RH vacuum refining desulfurization method |
| CN104946855A (en) * | 2015-07-15 | 2015-09-30 | 武汉钢铁(集团)公司 | Vacuum treatment method for high-aluminum ultralow-carbon steel |
| CN104946855B (en) * | 2015-07-15 | 2017-03-08 | 武汉钢铁(集团)公司 | A kind of vacuum processing method of high alumina ultra-low-carbon steel |
| CN110106313A (en) * | 2019-04-30 | 2019-08-09 | 上海盛宝冶金科技有限公司 | A kind of refining slag and its methods for making and using same |
| CN111621619A (en) * | 2020-06-03 | 2020-09-04 | 马鞍山市兴达冶金新材料有限公司 | Desulfurizer for reducing corrosion of RH refractory material and preparation process thereof |
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