CN101613787B - Liquid steel high-efficiency composite refining agent - Google Patents

Liquid steel high-efficiency composite refining agent Download PDF

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Publication number
CN101613787B
CN101613787B CN2009101157184A CN200910115718A CN101613787B CN 101613787 B CN101613787 B CN 101613787B CN 2009101157184 A CN2009101157184 A CN 2009101157184A CN 200910115718 A CN200910115718 A CN 200910115718A CN 101613787 B CN101613787 B CN 101613787B
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refining agent
steel
slag
liquid steel
composite refining
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CN101613787A (en
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凌幸福
梁桂邦
廖友祥
罗仁辉
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凌幸福
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00Technologies related to metal processing
    • Y02P10/20Recycling

Abstract

The invention provides a liquid steel high-efficiency composite refining agent which comprises the components by weight percent: 6-13% of Al, 2-10% of CaC2, 3-5% of Si, 4-15% of BaCO3, 13-36% of Al2O3, 20-45% of CaO, 4-8% of SiO2, 0% of H2O and 5-11% of other components. The composite refining agent has the advantages that 1. the desulfurization capability is high; 2. slagging speed is high, the submerged arc temperature rise effect is good, the slag absorption mixing capability is strong, and the slag washing function is good; 3. the application scope is wide; 4. the labor intensity is lightened; 5. the product yield is improved; and 6. the steel-making cost is reduced.

Description

Liquid steel high-efficiency composite refining agent
Technical field: the present invention relates to the additive of steel-making usefulness in a kind of metallurgical industry, particularly a kind of liquid steel high-efficiency composite refining agent.
Background technology: in the smelting process of existing steel, for oxygen, sulphur and other impurity of removing in the molten steel etc. carry out refining to molten steel, generally the technology of Cai Yonging is to throw in refining agent in molten steel, a kind of molten steel composite refining agent of Chongqing region for example, and its component constitutes and is: aluminium: 5%; Aluminum oxide: 18%; White residue: 25%; Carbide of calcium: 25%; Barium salt: 10%; Rhombspar: 5%; Wingdale: 5%; Other: 7%.Though it is in use good than existing other refining agent effect, but still exists deficiency: 1, sweetening power is also not high, it is average 19.2% that energising for the first time finishes desulfurization degree, finished product molten steel desulfurization degree average out to 71.1%; 2, the foamy slag that forms in the LF stove is a carbide slag, and this slag is difficult for separating with molten steel, the palpus artificial destruction it, otherwise z influences steel quality; The purified time is long slightly, needs more than 6 minutes at LF furnace refining agent sludging time; 3, applicable surface is narrower, is not suitable for the smelting of soft steel; The basicity deficiency can not be used for LD and directly go up system; 4, can not feed in raw material by high hopper, labor strength is big; Loss is big, because this refining agent is a granular structure, in input, hot gas flow can be taken away a part; 5, price is higher, generally at 3500-6000 unit/ton, is unfavorable for the reduction of steel-making cost.
Summary of the invention: the objective of the invention is to, the deficiency that in use exists at above-mentioned refining agent, but and a kind of widely applicable, sweetening power is high, refining time is short and high hopper is reinforced liquid steel high-efficiency composite refining agent proposed.
Can realize purpose of the present invention by following technical proposals, a kind of liquid steel high-efficiency composite refining agent is characterized in that, it mainly is made up of following compositions in weight percentage: Al:6~13%; CaC 2: 2~10%; Si:3~5%; BaCO 3: 4~15%; Al 2O 3: 13~36%; CaO:20~45%; SiO 2: 4~8%; H 2O:0%; Other are 5~11% years old.
Refining agent be shaped as the spherical particle that the powdered component forms through the anhydrous binder free dry-pressing of high pressure ball press.
The diameter of spherical particle refining agent is: 5-45mm.
Effect of the present invention is: 1, sweetening power height, energising for the first time finishes desulfurization degree average 24%, finished product molten steel desulfurization degree average out to 78.5%, after this mainly is to add it, has strongly reducing atmosphere, foamed white slag, corresponding temperature and suitable these creations of condition of basicity in the stove and make the sweetening power height; 2, change slag speed is fast, at the LF stove was slagging in 4-5 minute, and form the foamed white slag, submerged arc heats up effective, it is strong that slag absorption is mingled with ability, the wash heat better function has solved the problem that formed carbide slag of existing refining agent and existing refining agent slag can not foamed can not submerged arc heat up, and has shortened refining time; 3, widely applicable, not only good but also can be used for the smelting of soft steel in middle and high carbon steel field result of use, in addition because basicity is good, reductibility is strong, and can be used for LD and directly go up system, molten steel is carried out wash heat, make ladle foamed white slag, reduce the usage quantity of high price reductor simultaneously; But 4 high hoppers are reinforced, because this refining agent is spherical or lumphy structure, so can add by high hopper, improved the recovery rate of refining agent in molten steel, alleviated working strength of workers; 5, the product recovery rate improves; 6, steel-making cost reduces, and this price that is (1), product is lower, generally at 2400-3500 unit/ton; (2), reduce or cancelled the deoxidation of part high price, desulfurization and slag making materials; (3), reduced power consumption, prolonged furnace life, bag age, this is the significantly minimizing of the effective and fluorite usage quantity of submerged arc.
Below in conjunction with embodiment the present invention is further set forth:
Embodiment:
Embodiment 1: certain 100T of steel mill converter slab (Q235) is smelted, and the refining furnace high hopper is reinforced, materials: refining agent consumption 400kg, lime 700kg, fluorite 50kg; Reductive agent adds system: aluminum particulate 25kg, calcium carbide powder 30kg.
The refining agent compositions in weight percentage is:
Al:11.80%; CaC 2: 6%; Si:5%; BaCO 3: 7%; Al 2O 3: 33%; CaO:24%; SiO 2: 5.94%; H 2O:0%; Other: 7.26%.Other is mainly MgO, Fe, Cl, SrO.
The spherical particle diameter of refining agent is: 5mm.
Effect:
(1), slagging speed is fast, changes about 5min of slag time, the slag foamed, the submerged arc effect is better.
(2), to take off the S effect better, energising for the first time finishes to take off S and leads average out to 24%, it is 78.5% that the Finished Steel level takes off all that S leads.
(3), Al recovery rate height, contain golden trimming phase aluminum particulate add-on and reduced 10kg more originally.
(4), fluidity molten steel is better, fluidity molten steel difference situation do not occur.
(5), smelting adds the quantity of slag and reduction dosage according to reality, estimates 3.63 yuan/ton of saving costs.
(6), final slag composition
Project CaO Al2O3 SiO2 MgO FeO MnO
On average 54.36 20.12 14.28 6.25 0.47 0.18
Meet and contain the requirement of aluminum steel refining final slag composition.
Embodiment 2: certain 40Cr of special steel factory steel ingot is smelted (refining furnace 20t), and it is reinforced that refining furnace is manually thrown bag, materials: refining agent consumption 60kg, lime 150kg, fluorite 20kg; Reductive agent adds system: silicon carbide a little.
The refining agent compositions in weight percentage is:
Al:10%; CaC 2: 7%; Si:3%; BaCO 3: 12%; Al 2O 3: 30%; CaO:25.84%; SiO 2: 5.13%; H 2O:0%; Other: 7.03%.Other is mainly MgO, Fe, Cl, SrO.
The spherical particle diameter of refining agent is: 20mm.
Effect:
(1), to change slag speed fast, changes about 5min of slag time, the white and foamed of slag, the submerged arc intensification is effective.
(2), to take off S effective, energising for the first time finishes to take off S and leads average out to 26%, it is 80% that the Finished Steel level takes off all that S leads.
(3), yield of alloy improves 7%.
(4), fluidity molten steel is better, fluorite reduces 20kg, runner brick need not, cancelled refined synthetic slag, silicon carbide substantially need not.
(5), save 6.7 yuan/ton of costs.
(6), final slag composition
Project CaO Al2O3 SiO2 MgO FeO MnO
On average 54.33 18.12 15.18 6.43 0.51 0.12
Conclusion: refining agent satisfies the 40Cr of steel mill steel ingot fully and smelts needs.
Embodiment 3:
Certain steel mill 40 WellSmelting steel (refining furnace 50t), the refining furnace high hopper is reinforced, materials: refining agent consumption 150kg, lime 300kg, fluorite 80kg; Reductive agent adds system: silicon carbide a little.
The refining agent compositions in weight percentage is:
Al:11%; CaC 2: 9%; Si:5%; BaCO 3: 9%; Al 2O 3: 33%; CaO:20.71%; SiO 2: 5.86%; H 2O:0%; Other: 6.43%.Other is mainly MgO, Fe, Cl, SrO.
The spherical particle diameter of refining agent is: 30mm.
Effect:
(1), slagging speed is fast, changes slag time 4.5min, the slag foamed, submerged arc heats up effective, shortens more than the refining time 5min.
(2), to take off S effective, energising for the first time finishes to take off S and leads average out to 26%, it is 78% that the Finished Steel level takes off all that S leads.
(3), Al recovery rate height, yield of alloy improves 10%.
(4), fluidity molten steel is better, cored-wire is fed the 40m/ stove less, fluorite reduces the 40kg/ stove.
(5), every stove reduce cost 493 yuan (being to reduce FeAl 20kg, aluminium ash 100kg, submerged arc slag 50kg, synthetic slag 50kg, fluorite 40kg).
(6), final slag composition
Project CaO Al2O3 SiO2 S FeO MnO
On average 59.93 14.80 15.07 0.550 0.51 0.10
Conclusion: refining agent satisfies the production requirement of steel mill's aluminium Series Steel fully.
Embodiment 4:
Use behind certain steel mill's stove (50t ladle), smelt steel grade H08A, materials: refining agent consumption 130kg; Reductive agent adds system: Si-Al-Ca-Ba 80kg, ferro-aluminum 20kg, calcareous reductor 40kg.
The refining agent compositions in weight percentage is:
Al:12.6%; CaC 2: 4%; Si:3%; BaCO 3: 8%; Al 2O 3: 21%; CaO:40%; SiO 2: 6.28%; H 2O:0%; Other: 5.12%.Other is mainly MgO, Fe, Cl, SrO.
The spherical particle diameter of refining agent is: 45mm.
Effect:
(1), slagging speed is fast, it is slagging that tapping is finished, and gets slag specimen 4min from tapping to, slag is white, the slag foamed.
(2), to take off that S leads be 19.1%, if this factory's reductive agent add system according to tapping carbon adjust, tapping adds lime, take off S and lead and will reach 40-50%.
(3), fluidity molten steel is better, the separation property of molten steel and slag is good.
(4), tapping process reduces ferro-aluminum 20kg, minimizing aluminium matter reductor 40kg.
(5), every stove reduces cost 86 yuan.
(6), final slag composition
Project CaO Al2O3 SiO2 MgO FeO MnO
On average 51.23 14.60 18.93 6.75 0.94 0.21
Conclusion: refining agent satisfies the production requirement of LD on straight fully.

Claims (3)

1. a liquid steel high-efficiency composite refining agent is characterized in that, it is made up of following compositions in weight percentage: Al:6~13%; CaC 2: 2~10%; Si:3-5%; BaCO 3: 4~15%; Al 2O 3: 13~36%; CaO:20~45%; SiO 2: 4~8%; Other composition 5~11%, described other composition is MgO, Fe, Cl, SrO.
2. by the described liquid steel high-efficiency composite refining agent of claim 1, it is characterized in that, it be shaped as the spherical particle that the powdered component forms through the anhydrous binder free dry-pressing of high pressure ball press.
3. by the described liquid steel high-efficiency composite refining agent of claim 2, it is characterized in that the diameter of spherical particle refining agent is: 5-45mm.
CN2009101157184A 2009-07-17 2009-07-17 Liquid steel high-efficiency composite refining agent Expired - Fee Related CN101613787B (en)

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CN102559996A (en) * 2011-12-31 2012-07-11 淅川县森丽钢铁炉料有限公司 New silicon-aluminum-barium-calcium multicomponent deoxidation alloy for steelmaking and preparation technology thereof
CN103146890B (en) * 2013-02-04 2015-04-29 安徽省繁昌县皖南阀门铸造有限公司 Energy-saving environment-friendly steelmaking refining agent and preparation method thereof
CN103146880B (en) * 2013-02-04 2015-04-29 安徽省繁昌县皖南阀门铸造有限公司 Steelmaking refining agent bearing zirconium oxide and preparation method thereof
CN103146889B (en) * 2013-02-04 2015-04-29 安徽省繁昌县皖南阀门铸造有限公司 Barium ferromanganese molten steel external refining agent and preparation method thereof
CN103146887B (en) * 2013-02-04 2015-04-29 安徽省繁昌县皖南阀门铸造有限公司 Steel composite refining agents and preparation method thereof
CN103146879B (en) * 2013-02-04 2015-04-29 安徽省繁昌县皖南阀门铸造有限公司 Steelmaking refining agent containing modified smectite powder and preparation method thereof
CN103952514B (en) * 2014-03-28 2016-09-07 北京科技大学 Al base double deoxidizer and its preparation method and application
CN111944951A (en) * 2020-08-17 2020-11-17 武安市裕华钢铁有限公司 Aluminum electric deoxidizer
CN111944952A (en) * 2020-08-17 2020-11-17 武安市裕华钢铁有限公司 Smelting and rolling process for hot-rolled coil plate of titanium microalloy pipeline steel

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