CN102876849A - Calcium pressing refining slag for steel production and preparation method thereof - Google Patents

Calcium pressing refining slag for steel production and preparation method thereof Download PDF

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Publication number
CN102876849A
CN102876849A CN2012102260767A CN201210226076A CN102876849A CN 102876849 A CN102876849 A CN 102876849A CN 2012102260767 A CN2012102260767 A CN 2012102260767A CN 201210226076 A CN201210226076 A CN 201210226076A CN 102876849 A CN102876849 A CN 102876849A
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rich
raw
refining slag
slag
calcium
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陈云天
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LIAONING TIANHE TECHNOLOGY Co Ltd
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LIAONING TIANHE TECHNOLOGY Co Ltd
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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 discloses calcium pressing refining slag for steel production and a preparation method thereof. The refining slag comprises the following components: 30-50% of CaO, 30-50% of Al2O3, not more than 6.0% of SiO2, not more than 2.0% of F<->, 4-6% of MgO, not more than 12% of alkali and not more than 5% of the balance. The production raw materials are industrial wastes rich in calcium oxide and alumina. The preparation method comprises the following steps: grinding the raw materials to powder, mixing according to a certain proportion, and pressing to blocky refining slag rich in CaO and Al2O3 at a predetermined particle size by a high pressure granulator. The refining slag, provided by the invention, has the advantages of stable performance, no degeneration, no water absorption, no dusting, low fluorine, convenience for storage and transportation, and convenience for environmental protection; slugging is promoted and the smelting time is reduced in a steel production process, and the molten steel is refined and desulfurized in a steel discharge process or in an LF furnace.

Description

Calcareous compacting refining slag of a kind of steelmaking aluminum and preparation method thereof
Technical field
The invention belongs to the STEELMAKING PRODUCTION technical field, particularly calcareous refining slag of a kind of steelmaking aluminum and preparation method thereof.
Background technology
In the method for existing LF stove liquid steel refining, mainly contain two kinds: a kind of is to add lime simultaneously with addition of the part fluorite in ladle, or adding lime simultaneously with addition of part aluminium vanadine and a small amount of fluorite, another kind of method is to add lime simultaneously with addition of partially sintering type or preliminary melting type calcium aluminate in ladle.Adopt by contrast lime to add the part fluorite or lime adds the refinery practice that part aluminium vanadine adds a small amount of fluorite, owing to all there being the requirement of certain particle size to make lime be difficult for fusing, its change slag time is grown and affects refining effect, and the refractory materials of used fluorite contaminate environment and etch ladle; Adopt lime to add the refinery practice of sintered type or preliminary melting type calcium aluminate, it changes slag and refining effect improves, but raw materials cost is relatively high.
Chinese patent CN97121984.2 discloses a kind of prescription and manufacture method thereof of low silicon content aluminium-calcium slag, although this aluminium calcium slag has rational chemical constitution, low melting point, without advantages such as free calcium oxide, good fluidities, but because S, Si content are higher in the raw materials used coke, cause its Sulfur capacity coefficient to reduce, limit the performance of its desulfidation, be unfavorable for the dark desulfurization of molten steel.
Chinese patent CN02120744.5 discloses pre-molten low-melting point composite calcium aluminate desulfurizer and preparation method thereof, because melting after the first passivation of palpus in the production process of this composite desulfurizing agent, operation is loaded down with trivial details, and cost is higher.
Chinese patent CN200710023020.0 discloses a kind of preliminary melting type vacuum smelting sweetening agent and preparation method thereof, this sweetening agent adopts the method for first fritting, rear mix, inhomogeneous, the unsettled situation of effect that component is prone to, and operation is more loaded down with trivial details, and cost is higher.
Chinese patent CN200310103105.1 discloses a kind of pre-molten refining scavenging agent and production technique thereof, this premelt molten steel cleaning agent, although reached certain sweetening effectiveness, but the erosion of the refractory materials that high fluorite content brings, not only had a strong impact on the work-ing life of furnace lining or ladle lining, and unfavorable environmental protection, application is limited by very large.
Summary of the invention
The objective of the invention is to overcome the defective that above-mentioned method of refining and pre-melted refining slag exist, a kind of low-cost environment-friendly steelmaking refining slag of being produced as main raw material with trade waste and preparation method thereof is provided.
In order to reach the foregoing invention purpose, technical scheme of the present invention is as follows, and the preparation method of this dephosphorizing agent may further comprise the steps:
The first step: prepare raw material, raw material comprises the material that is rich in calcium oxide and the rejected material that is rich in aluminum oxide;
Second step: Raw material processing, the raw material of preparing in the first step is made respectively 0~0.5mm powder materials;
The 3rd step: mix, the raw material of the powder that is prepared into is dropped in the forced stirrer by a certain percentage mix;
The 4th step: moulding, the powder that mixes is added the high pressure tablets press be pressed into predetermined granularity, make and be rich in CaO and Al 2O 3, the general 15mm~30mm of granularity the spherulitic refining slag.Wherein, the material that is rich in calcium oxide in the raw material comprise calcite, Wingdale, etc. raw mineral materials and the various trade wastes such as carbide slag, calcium lime powder, paper white sludge, calcareous dedusting ash that are rich in calcium oxide.The trade wastes such as the aluminium ash that is rich in aluminum oxide that produces in the material that is rich in aluminum oxide in the raw material and the Industrial processes, aluminium slag.The weight percentage ranges of above-mentioned two class materials is respectively: the material that is rich in aluminum oxide is 70%~90%; The material that is rich in calcium oxide is 50%~70%.
The composition range of the calcareous compression moulding refining slag of low-cost steelmaking aluminum for preparing at last, is: CaO30~50%, Al 2O 330~50%, SiO 2≤ 6.0%, F -≤ 2.0%, MgO:4~6%, cut down according to the circumstance≤12%, other content of impurities (solid)≤5%.
During use, in refining ladle, add compacting spherulitic refining slag of the present invention, because of its CaO matter particulate and Al 2O 3Matter particulate height mixes and is very even, the specific surface area of two kinds of materials large (adding part fluorite or lime with lime adds the material that part aluminium vanadine adds the refinery practice of a small amount of fluorite and compare high hundred times) can be at the new 12CaO.7Al that forms of moment by the temperature of molten steel 2O 3Mineral structure and rapid melting (its fusing point is lower than 1350 ℃), and then promote other refining material melts slagging, realize the liquid steel refining desulfurization.This is key point of the present invention; In tapping process, or at the LF stove molten steel is carried out in the refining process adding compacting spherulitic refining slag of the present invention, reach the purpose of molten steel being carried out refining desulfuration.
The invention has the beneficial effects as follows: because the raw material of compacting spherulitic refining slag of the present invention extensively adopted raw mineral materialss such as comprising calcite, Wingdale and carbide slag, calcium lime powder, paper white sludge, calcareous dedusting ashes etc. to be rich in calcium oxide and be rich in the trade wastes such as aluminium ash, aluminium slag of aluminum oxide, so the products production cost is low.Simultaneously, compacting spherulitic refining slag of the present invention, low, the molten speed of fusing point.Add part fluorite refinery practice ratio with lime in the LF stove, fluorine content only reaches 1/20 in the slag; Add part aluminium vanadine with lime in the LF stove and add part fluorite refinery practice ratio, the refining slag is fast, fluorine content is much lower in the slag, and comprehensive refining cost is low; With add part pro-molten refining slag ratio in the LF stove, under the condition that desulfurization degree slightly reduces, comprehensive refining cost obviously reduces.Therefore suppress the spherulitic refining slag and be used for steel-makingization slag and LF stove refinery practice, be more conducive to promote and popularize.
Embodiment
Below, describe the preferred embodiments of the present invention in detail.Need to prove before this, employed term or word can not limited interpretation be the implication in common implication or the dictionary in this specification and claims book, and should be based in order to illustrate that in the best way principle that its invention contriver can suitably define the concept of term is interpreted as meeting implication and the concept of the technology of the present invention thought.Thereupon, the structure that represents among the embodiment that this specification sheets is put down in writing is one of most preferred embodiment of the present invention, can not represent technological thought of the present invention fully, therefore should be understood that to have for the present invention various equivalents and the variation that can replace.
Total preparation:
Raw material: adopt the material be rich in calcium oxide, the various trade wastes such as carbide slag, calcium lime powder, paper white sludge, calcium powder that comprise the raw mineral materials such as calcite, Wingdale and be rich in calcium oxide, 40~60% (weight); And the material that is rich in aluminum oxide comprises the trade wastes such as the aluminium ash that is rich in aluminum oxide that produces in the raw mineral materialss such as bauxitic clay and the Industrial processes, aluminium slag, 40~60% (weight).Trade waste is chief component in the above-mentioned raw materials, and raw mineral materials is less important integral part.
Preparation: the material that will be rich in first the material of calcium oxide and be rich in aluminum oxide is made the fine powdered of 0~0.5mm, the raw material of the fine powder that is prepared into is dropped in the forced stirrer by a certain percentage to mix again;
Then the powder materials that mixes is added the high pressure tablets press and be pressed into predetermined grain piece, make and be rich in CaO and Al 2O 3, the general 15mm~30mm of granularity the spherulitic refining slag.In the actual production, because calcic raw material and aluminum-containing raw material kind is different, should select different ratio of components.
Below provide the several exemplary embodiments under the different working conditions, because the obtainable raw material during actual production varies, particularly in certain situation that the class raw material is many, other raw materials are few, should do suitable adjustment for the concrete technology parameter in the production stage, illustrate that also suitability of the present invention is extensive, cost is low, manageable characteristics.
Embodiment one:
Raw material: be rich in the trade waste 40% (weight) of aluminum oxide, Al 2O 3: 90%; Be rich in the trade waste 60% (weight) of calcium oxide, CaO:53%.
Preparation: the trade waste that will be rich in first the trade waste of calcium oxide and be rich in aluminum oxide is made the fine powdered of 0~0.5mm, the raw material of the fine powder that is prepared into is dropped in the forced stirrer by a certain percentage to mix again;
Then the powder materials that mixes is added the high pressure tablets press and be pressed into predetermined grain piece, make and be rich in CaO and Al 2O 3, the general 15mm~30mm of granularity the spherulitic refining slag.Its finished product component is: Al 2O 337%, CaO:33%, SiO 2: 6.0%, F -: 2.0%, MgO:5.6%, cut down according to the circumstance: 11.9%, other content of impurities (solid): 4.5%.
Use: in steelmaking process, be used as steel-makingization slag, the compacting spherulitic refining slag of adding 3.0kg/ ton steel in the steel melting furnace, the steelmaking process slag is good, with equivalent fluorite ratio, sludging time shortening 0.5 minute.
Embodiment two:
Raw material: raw material: be rich in the trade waste 40% (weight) of aluminum oxide, Al 2O 3: 90%; Be rich in the trade waste 60% (weight) of calcium oxide, CaO:65%.
Preparation: the trade waste that will be rich in first the trade waste of calcium oxide and be rich in aluminum oxide is made the fine powdered of 0~0.5mm, the raw material of the fine powder that is prepared into is dropped in the forced stirrer by a certain percentage to mix again;
Then the powder materials that mixes is added the high pressure tablets press and be pressed into predetermined grain piece, make and be rich in CaO and Al 2O 3, the general 15mm~30mm of granularity the spherulitic refining slag.Its finished product component is: Al 2O 336%, CaO:39%, SiO 2: 4.0%, F -: 1.8%, MgO:4.5%, cut down according to the circumstance: 10.5%, other content of impurities (solid): 4.2%.
Use: at the LF stove molten steel is carried out in the refining process, add the spherulitic refining slag of 2.0kg/ ton steel in the ladle, after the refining, the desulfurization degree of molten steel reaches 70%.With equivalent fluorite ratio, refining time shortens 1.5 minutes.Sweetening effectiveness is suitable.
Embodiment three:
Raw material: raw material: be rich in the trade waste 50% (weight) of aluminum oxide, Al 2O 3: 80%; Be rich in the trade waste 50% (weight) of calcium oxide, CaO:70%.
Preparation: the trade waste that will be rich in first the trade waste of calcium oxide and be rich in aluminum oxide is made the fine powdered of 0~0.5mm, the raw material of the fine powder that is prepared into is dropped in the forced stirrer by a certain percentage to mix again;
Then the powder materials that mixes is added the high pressure tablets press and be pressed into predetermined grain piece, make and be rich in CaO and Al 2O 3, the general 15mm~30mm of granularity the spherulitic refining slag.Its finished product component is: Al 2O 3: 40%, CaO:35%, SiO 2: 4.2%, F -: 1.7%, MgO:4.0%, cut down according to the circumstance: 11.2%, other content of impurities (solid): 3.9%.
Use: in tapping process, add the spherulitic refining slag of 2.0kg/ ton steel in the ladle, after the refining, the desulfurization degree of molten steel reaches 75%.With equivalent fluorite ratio, refining time shortens 1.5 minutes.Sweetening effectiveness is suitable.
Use: at the LF stove molten steel is carried out in the refining process, add the spherulitic refining slag of 3.0kg ton steel in the ladle, after the refining, the desulfurization degree of molten steel reaches 76%.With equivalent fluorite ratio, refining time shortens 1.5 minutes.Desulfuration efficiency improves 5 percentage points.
Be described and illustrate with reference to embodiment although it should be noted that the present invention, and in embodiment, provided composition and the concrete preparation method thereof of the calcareous pre-melted refining slag of low-cost steelmaking aluminum.But and do not mean that the present invention is limited to the embodiment of these descriptions.Those skilled in the art can therefrom derive many different variants, and they all will be covered in the true spirit and scope of claim of the present invention.

Claims (5)

1. calcareous pre-melted refining slag of low-cost steelmaking aluminum, it is characterized in that: the composition scope of described pre-melted refining slag: the composition scope is: CaO30~50%, Al 2O 330~50%, SiO 2≤ 6.0%, F-≤2.0%, MgO:4~6%, cut down according to the circumstance≤12%, other content of impurities (solid)≤5%.
2. a low-cost steel-making is with the preparation method of high pressure tablets press compression moulding refining slag, and it is characterized in that: the preparation method may further comprise the steps:
The first step: prepare raw material, raw material comprises the material that is rich in calcium oxide and the material that is rich in aluminum oxide;
Second step: the fine powdered of the raw material of preparing in the first step being made respectively 0~0.5mm;
The 3rd step: mix, the raw material of the powder that is prepared into is dropped in the forced stirrer by a certain percentage mix;
The 4th step: granulating and forming, the powder that mixes is added the high pressure tablets press be pressed into predetermined granularity, make and be rich in CaO and Al 2O 3, the general 15mm~30mm of granularity the spherulitic refining slag.
3. the preparation method of the calcareous compression moulding refining slag of a kind of low-cost steelmaking aluminum according to claim 2, it is characterized in that: the material that the raw material in the first step is rich in calcium oxide comprises the raw mineral materialss such as calcite, Wingdale and is rich in the various trade wastes such as the carbide slag of calcium oxide, calcium lime powder, paper white sludge, calcium powder, and wherein trade waste is chief component.
4. the preparation method of the calcareous compression moulding refining slag of a kind of low-cost steelmaking aluminum according to claim 2, it is characterized in that: the material that the raw material in the first step is rich in aluminum oxide comprises the trade wastes such as the aluminium ash that is rich in aluminum oxide that produces in the raw mineral materialss such as bauxitic clay and the Industrial processes, aluminium slag, and wherein trade waste is chief component.
5. according to claim 3 or the preparation method of the calcareous compression moulding refining slag of 4 described a kind of low-cost steelmaking aluminums, it is characterized in that: the weight percentage ranges that the raw material in the first step is rich in the material of aluminum oxide is 70%~90%; The weight percentage ranges that is rich in the material of calcium oxide is 50%~70%.
CN2012102260767A 2012-06-28 2012-06-28 Calcium pressing refining slag for steel production and preparation method thereof Pending CN102876849A (en)

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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104531954A (en) * 2015-01-16 2015-04-22 新疆八一钢铁股份有限公司 Production technology of molten aluminum killed steel cleaning agent
CN105234423A (en) * 2015-10-10 2016-01-13 江苏海光金属有限公司 AD powder prepared from waste aluminite powder and technological method
CN107312909A (en) * 2016-04-26 2017-11-03 武汉科技大学 A kind of desulfurization slag former
CN107893148A (en) * 2017-12-04 2018-04-10 河钢股份有限公司承德分公司 A kind of method of the pre- desulfurization of half steel
CN110093478A (en) * 2019-04-30 2019-08-06 上海盛宝冶金科技有限公司 A kind of production method of liquid steel refining slag making desulfurization refining slag
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
CN110144435A (en) * 2019-04-30 2019-08-20 上海盛宝冶金科技有限公司 A kind of refining slag for LF refining
CN110184419A (en) * 2019-06-20 2019-08-30 福安市青拓环保建材有限公司 A kind of novel micro mist and preparation method thereof using refining slag production
CN110283966A (en) * 2019-07-18 2019-09-27 刘继唐 A kind of multi-functional steel-making fritting Conductive Slag refining agent and preparation method thereof
CN110453044A (en) * 2019-08-14 2019-11-15 上海盛宝冶金科技有限公司 A kind of method of preparation and use of furnace steel refining slag
CN111485067A (en) * 2020-05-25 2020-08-04 浙江澄宇环保新材料股份有限公司 Novel slag former for steel refining and preparation method thereof

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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104531954A (en) * 2015-01-16 2015-04-22 新疆八一钢铁股份有限公司 Production technology of molten aluminum killed steel cleaning agent
CN105234423A (en) * 2015-10-10 2016-01-13 江苏海光金属有限公司 AD powder prepared from waste aluminite powder and technological method
CN107312909A (en) * 2016-04-26 2017-11-03 武汉科技大学 A kind of desulfurization slag former
CN107893148A (en) * 2017-12-04 2018-04-10 河钢股份有限公司承德分公司 A kind of method of the pre- desulfurization of half steel
CN110093478A (en) * 2019-04-30 2019-08-06 上海盛宝冶金科技有限公司 A kind of production method of liquid steel refining slag making desulfurization refining slag
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
CN110144435A (en) * 2019-04-30 2019-08-20 上海盛宝冶金科技有限公司 A kind of refining slag for LF refining
CN110184419A (en) * 2019-06-20 2019-08-30 福安市青拓环保建材有限公司 A kind of novel micro mist and preparation method thereof using refining slag production
CN110283966A (en) * 2019-07-18 2019-09-27 刘继唐 A kind of multi-functional steel-making fritting Conductive Slag refining agent and preparation method thereof
CN110453044A (en) * 2019-08-14 2019-11-15 上海盛宝冶金科技有限公司 A kind of method of preparation and use of furnace steel refining slag
CN111485067A (en) * 2020-05-25 2020-08-04 浙江澄宇环保新材料股份有限公司 Novel slag former for steel refining and preparation method thereof

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Application publication date: 20130116