CN104073598A - Efficient composite slag lotion - Google Patents

Efficient composite slag lotion Download PDF

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Publication number
CN104073598A
CN104073598A CN201410140842.7A CN201410140842A CN104073598A CN 104073598 A CN104073598 A CN 104073598A CN 201410140842 A CN201410140842 A CN 201410140842A CN 104073598 A CN104073598 A CN 104073598A
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wash heat
heat agent
high efficiency
parts
efficiency composition
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CN104073598B (en
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程卓
高云强
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HENAN PENGYU GROUP CO Ltd
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HENAN PENGYU GROUP CO Ltd
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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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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Abstract

The invention discloses efficient composite slag lotion which comprises the following raw materials in percentage by weight: 49-70% of calcium powder, 20-45% of aluminum ash, 5-12% of high-alumina cement and 0.5-2.0% of sodium carboxymethylcellulose. The calcium powder, the aluminum ash and the high-alumina cement are applied to synergic desulfuration, and are used for mutually filling and refining the porous structure of the slag lotion, and the obtained efficient composite slag lotion is good in deoxidation and desulfuration effect and impurity absorption effect and rapid in slagging speed, and has a remarkable function in improving the comprehensive economic benefits of steel plate companies.

Description

High efficiency composition wash heat agent
Technical field
The invention belongs to smelting iron and steel technical field, be specifically related to a kind of high efficiency composition wash heat agent.
Background technology
Along with the continuous progress of Economic development, client also further improves the specification of quality of steel, in steel production process, how to utilize low cost to improve Cleanliness of Molten Steel, and reducing inclusion content of steel is the key of expanding market.Furnace outer refining technology is the key that obtains high yield and high quality steel, adopts wash heat and Argon processing, reaches deoxidization desulfuration and goes the effect being mingled with, and has met the quality demand of finished product molten steel, has reduced smelting cost simultaneously.
At present conventional wash heat agent is pro-molten refining slag and with CaO-Al 2o 3-CaF 2for basic solid synthetic slag, the former production cost is high, energy consumption is high, pollution is large; Although the latter can reach the refining requirement of most of steel grade, the fusing point of this slag is high, and slagging speed is slow, affects rhythm of production, and dark sweetening effectiveness is undesirable; In slag charge, activity of lime is higher, easily absorbs moisture, carbonic acid gas iso-metamorphism, causes the inconvenience on transport and storage.
Aluminium ash is the slag producing in electrolytic aluminum or cast aluminum-molykote composite material production technique, containing metal aluminium approximately 15 ~ 20%, and all the other main components are Al 2o 3and SiO 2, at present, being mainly used in electrosmelting, aluminium ash is less for refining aspect report, is generally used for the research of sweetening effectiveness, in " application of aluminium ash sweetening agent in pipe line steel refining " literary composition, has studied aluminium ash is replaced to the Al in refining slag 2o 3, test sweetening effectiveness.
High-alumina cement is mainly used in building field, and composition is taking calcium aluminate as main, alumina content approximately 50%, at present, high-alumina cement has no the report for liquid steel refining aspect substantially, only the document as pro-molten refining slag main raw material about calcium aluminate, in this, conventionally with CaO and Al 2o 3mix by molecular ratio 12:7, be refining slag therefore be called calcium aluminate, its calcium oxide content is controlled at lower level, as mentioned in " calcium aluminate pro-molten refining slag desulfurization " literary composition: calcium aluminate is pre-melted slag, improve calcium oxide content and can improve the deoxidizing capacity of calcium aluminate refining slag, but also can cause the rising of its temperature of fusion, laboratory study is found, in the time that additional calcium oxide content increases to 20%, its sweetening power slightly declines.
Summary of the invention
The object of the invention is in order to make up the deficiencies in the prior art, a kind of high efficiency composition wash heat agent is provided, this wash heat agent environmental pollution is little, and cost is low, and deoxidization desulfuration effect and absorb inclusion are effective, and slagging speed is fast.
A kind of high efficiency composition wash heat agent, its raw material (Wt%) comprising: calcium powder 49 ~ 70%, aluminium ash 20 ~ 45%, high-alumina cement 5 ~ 12%, Xylo-Mucine 0.5 ~ 2.0%.
The Chemical Composition (Wt%) of described high efficiency composition wash heat agent comprises: CaO 30 ~ 50%, Al 2o 320 ~ 40%, Al 2 ~ 6%, SiO 2≤ 8%, MgO≤6%, H 2o≤1%.
The raw material (Wt%) of described high efficiency composition wash heat agent comprises: calcium powder 55 ~ 65%, aluminium ash 22.5 ~ 35%, high-alumina cement 9.5 ~ 12%, Xylo-Mucine 0.5 ~ 2.0%.
The Chemical Composition (Wt%) of described high efficiency composition wash heat agent comprises: CaO 35.5 ~ 45%, Al 2o 323.5 ~ 32.7%, Al 2.8 ~ 3.9%, SiO 26.1 ~ 7.2%, MgO 4.7 ~ 5.5%, H 2o 0.53 ~ 0.82%.
The raw material of described high efficiency composition wash heat agent requires: calcium powder granularity 0 ~ 3mm, aluminium ash granularity 0 ~ 3mm, high-alumina cement granularity 150 orders.
Below in conjunction with beneficial effect, the invention will be further described.
1) in raw material, add aluminium ash, utilize aluminium ash to remove the oxygen in molten steel, deoxidation strengthens the mobility in wash heat agent, reduced viscosity, and deoxidation is fully conducive to improve the dynamic conditions of desulfurization, makes desulfurization rate and Sulfur capacity larger; Calcium powder, aluminium ash all have desulfidation with high-alumina cement, in the time adopting 49 ~ 70% calcium powders, 20 ~ 45% aluminium ashes and 5 ~ 12% high-alumina cement, it is best that synergy reaches, and can effectively improve sweetening effectiveness, promote to reach the object of dark desulfurization, improve the resistance to erosional competency of furnace lining.
2) in aluminium ash, contain Al 2o 3and SiO 2, can promote the fusing of wash heat agent, be convenient to slagging in advance; 150 object high-alumina cements and calcium powder and aluminium powder are filled mutually, and pore structure that can refinement wash heat agent, avoids because aluminium ash content is high, cause wash heat agent burn-off rate in molten steel too fast; The filling of high-alumina cement and aluminium powder, has reduced the water-intake rate of calcium powder, has ensured the dry of wash heat agent, and the water-content in wash heat agent is remained on below 1%, makes wash heat agent be difficult for conglomeration, does not affect result of use, avoids causing molten steel to increase hydrogen.
3) in raw material, be added with 0.5 ~ 2.0% additive Xylo-Mucine, the binding agent during as granulation, can ensure wash heat agent granule strength and yield rate, obtains good structural sheet while making wash heat agent fusing.
4) in aluminium ash contained metallic aluminium by the iron oxide reduction in ladle scum silica frost; Al in aluminium ash and high-alumina cement 2o 3be conducive to maintaining of foamy slag, make the CaO in wash heat agent contain higher free state, be also conducive to reduce inclusion in molten steel: in molten steel, inclusion is as SiO 2, MnO, TiO 2, Al2O3 etc., crystal is small, in the molten steel of large proportion, ascent rate is slow, be difficult to be caught and absorb by common wash heat agent, the content high reactivity of CaO is large, just strong with the avidity of these inclusiones, can make inclusion separate out from molten steel microlitic structure, easily form the macromolecular complex things such as Calucium Silicate powder, Aluminum calcium silicate, absorbed and assimilate by composite slag lotion thereby float to molten steel surface, having reduced to greatest extent the inclusion content in molten steel, changing better the potential of hydrogen of bits, promote the reaction of slag steel, obtain good sweetening effectiveness.
5) Al 2o 3, CaO and MgO be the major influence factors of wash heat agent temperature of fusion and viscosity, at Al 2o 3when content is higher, CaO is larger than MgO on the impact of temperature of fusion, MgO with Al 2o 3, CaO interaction in time, it is more even that MgO content affects amplitude to the temperature of fusion of wash heat agent, but because its viscosity influence to wash heat agent is larger, therefore MgO content is controlled at below 6%; By 30 ~ 50%CaO and 20 ~ 40%Al 2o 3carry out composition proportion, can make wash heat agent obtain lower fusing point and suitable slag viscosity.
6) this wash heat agent adopts basic slag system, by adjusting the potential of hydrogen of bits, improves mobility and the absorb inclusion effect of bits; In wash heat agent, contain SiO 2there is certain fluxing action, but because content is unfavorable for deoxidation, desulfurization when high, therefore be controlled at SiO2≤8%.MgO and SiO 2a small amount of existence can reduce the Mechanism of Formation of The Globular Inclusions in steel, improves impurity-eliminating effect.
7) through on-the-spot test, use this high efficiency composition wash heat agent, to the absorb inclusion successful of molten steel, reduce to greatest extent the inclusion content in molten steel, change better the potential of hydrogen of bits, effectively substituted original use pro-molten refining slag, reduce environmental pollution, reduce steel-making cost, there is remarkable effect to improving steel plate Enterprise Integrated economic benefit.
Specific embodiment
High efficiency composition wash heat agent of the present invention, the raw material (Wt%) of described wash heat agent comprises: calcium powder 49 ~ 70%, aluminium ash 20 ~ 45%, high-alumina cement 5 ~ 12%, CMC 0.5 ~ 2.0%.
The Chemical Composition (Wt%) of described high efficiency composition wash heat agent comprises: CaO 30 ~ 50%, Al 2o 320 ~ 40%, Al 2 ~ 6%, SiO 2≤ 8%, MgO≤6%, H 2o≤1%.
Described wash heat agent producing process is:
1. the inspection of raw and process materials and proportioning: by described composition of raw materials and material requirements, take 55 ~ 70 parts of calcium powders, 20 ~ 45 parts of aluminium ashes, 5 ~ 12 parts of high-alumina cements, 0.5 ~ 2.0 part of CMC, stir and make blended stock;
2. water distribution is stirred: by the blended stock stirring that adds water, amount of water is 18 ~ 25% of blended stock quality;
3. ball processed: adopt conventional disc granulation technology, by the blended stock granulation after adding water;
4. entering hole dries: gained particle is dried at 65 ~ 80 DEG C, and moisture (Wt%) content≤0.1% after drying, makes described high efficiency composition wash heat agent.
The using method of described wash heat agent is: in the time of converter or electric furnace steel tapping, in advance high efficiency composition wash heat agent is added to ladle bottom, or add in advance 1/3rd, in the time tapping and after the mixed punching of molten steel, add 2/3rds.
Below in conjunction with embodiment, the invention will be further described.
Embodiment mono-
The preparation of high efficiency composition wash heat agent of the present invention, can be in the steps below:
1. the inspection of raw and process materials and proportioning: by described composition of raw materials and material requirements, take 49 parts of calcium powders, 45 parts of aluminium ashes, 5 parts of high-alumina cements, 1.0 parts of CMC, stir and make blended stock;
2. water distribution is stirred: add 18 parts of water to stir blended stock;
3. ball processed: adopt conventional disc granulation technology, by the blended stock granulation after adding water;
4. entering hole dries: gained particle is dried at 65 DEG C, measure gained high efficiency composition wash heat agent composition and comprise: CaO 30%, Al after drying 2o 340%, Al 5%, SiO 27.7%, MgO 8%, H 2o 0.3%.
Embodiment bis-
The preparation of high efficiency composition wash heat agent of the present invention, can be in the steps below:
1. the inspection of raw and process materials and proportioning: by described composition of raw materials and material requirements, take 50 parts of calcium powders, 40 parts of aluminium ashes, 8.8 parts of high-alumina cements, 1.2 parts of CMC, stir and make blended stock;
2. water distribution is stirred: add 19 parts of water to stir blended stock;
3. ball processed: adopt conventional disc granulation technology, by the blended stock granulation after adding water;
4. entering hole dries: gained particle is dried at 69 DEG C, measure gained high efficiency composition wash heat agent composition and comprise: CaO 31.2%, Al after drying 2o 337%, Al 4.5%, SiO 28%, MgO 7.8%, H 2o 0.35%.
Embodiment tri-
The preparation of high efficiency composition wash heat agent of the present invention, can be in the steps below:
1. the inspection of raw and process materials and proportioning: by described composition of raw materials and material requirements, take 55 parts of calcium powders, 35 parts of aluminium ashes, 9.5 parts of high-alumina cements, 0.5 part of CMC, stir and make blended stock;
2. water distribution is stirred: add 20 parts of water to stir blended stock;
3. ball processed: adopt conventional disc granulation technology, by the blended stock granulation after adding water;
4. entering hole dries: gained particle is dried at 71 DEG C, measure gained high efficiency composition wash heat agent composition and comprise: CaO 35.5%, Al after drying 2o 332.7%, Al 3.9%, SiO 27.2%, MgO 6.5%, H 2o 0.53%.
Embodiment tetra-
The preparation of high efficiency composition wash heat agent of the present invention, can be in the steps below:
1. the inspection of raw and process materials and proportioning: by described composition of raw materials and material requirements, take 60 parts of calcium powders, 28 parts of aluminium ashes, 11 parts of high-alumina cements, 2.0 parts of CMC, stir and make blended stock;
2. water distribution is stirred: add 22 parts of water to stir blended stock;
3. ball processed: adopt conventional disc granulation technology, by the blended stock granulation after adding water;
4. entering hole dries: gained particle is dried at 74 DEG C, measure gained high efficiency composition wash heat agent composition and comprise: CaO 39.7%, Al after drying 2o 328%, Al 3.4%, SiO 26.5%, MgO 5.9%, H 2o 0.75%.
Embodiment five
The preparation of high efficiency composition wash heat agent of the present invention, can be in the steps below:
1. the inspection of raw and process materials and proportioning: by described composition of raw materials and material requirements, take 65 parts of calcium powders, 22.5 parts of aluminium ashes, 12 parts of high-alumina cements, 0.5 part of CMC, stir and make blended stock;
2. water distribution is stirred: add 24 parts of water to stir blended stock;
3. ball processed: adopt conventional disc granulation technology, by the blended stock granulation after adding water;
4. entering hole dries: gained particle is dried at 77 DEG C, measure gained high efficiency composition wash heat agent composition and comprise: CaO 45%, Al after drying 2o 323.5%, Al 2.8%, SiO 26.1%, MgO 5.2%, H 2o 0.82%.
Embodiment six
The preparation of high efficiency composition wash heat agent of the present invention, can be in the steps below:
1. the inspection of raw and process materials and proportioning: by described composition of raw materials and material requirements, take 70 parts of calcium powders, 20 parts of aluminium ashes, 8.5 parts of high-alumina cements, 1.5 parts of CMC, stir and make blended stock;
2. water distribution is stirred: add 25 parts of water to stir blended stock;
3. ball processed: adopt conventional disc granulation technology, by the blended stock granulation after adding water;
4. entering hole dries: gained particle is dried at 80 DEG C, measure gained high efficiency composition wash heat agent composition and comprise: CaO 50%, Al after drying 2o 320%, Al 2%, SiO 25.8%, MgO 4.5%, H 2o 1.0%.
For six embodiment gained wash heat agent, be numbered respectively 1,2,3,4,5,6, carry out series of experiments below:
(1) sweetening effectiveness: experiment is taken from molten steel before certain steel mill's external refining with steel, and measuring wherein sulphur content is 0.74 × 10 -4, in molten steel, add this several groups of wash heat agent respectively, detect in molten steel and remain sulphur content every 5min, record sulphur content as shown in the table.
Comprehensively relatively upper table experimental data, known, in 5min, in molten steel, sulphur content can be from 0.74 × 10 -4be down to (0.49 ~ 0.56) × 10 -4, 15min is reduced to (0.31 ~ 0.38) × 10 -4, desulfurization in early stage is rapid; After 30min, sulphur content is basicly stable in (0.19 ~ 0.27) × 10 -4between, the later stage is substantially without returning sulphur phenomenon; Illustrate that this wash heat agent has good sweetening effectiveness; In slag, sulphur content has reduced by 63.5% ~ 74.3%, has reached the object of dark desulfurization.
In above-mentioned data, the 3rd, 4,5 groups, 15min sulphur content is reduced to (0.31 ~ 0.34) × 10 -4, after 30min, sulphur content is basicly stable in (0.19 ~ 0.23) × 10 -4between, in slag, sulphur content has reduced by 68.9% ~ 74.3%, and these three groups of deoxidation effects are obviously better than other group time.
(2) deoxidation effect: measure before (1) middle test, in molten steel, oxygen level is 0.5 × 10 -5, measure it and add oxygen level after wash heat agent, record oxygen level as shown in the table.
Comprehensively relatively upper table experimental data, known, in 5min, in molten steel, oxygen level can be from 0.5 × 10 -5be down to (0.39 ~ 0.43) × 10 -5, 15min is reduced to (0.25 ~ 0.31) × 10 -5, after 30min, oxygen level is basicly stable in (0.16 ~ 0.23) × 10 -5between, illustrate that this wash heat agent has good deoxidation and absorption deoxidation products is effective, can meet the demand to deoxidation of molten steel.
In above-mentioned data, the 3rd, 4,5 groups, 15min oxygen level is reduced to (0.30 ~ 0.32) × 10 -5, after 30min, oxygen level is basicly stable in (0.15 ~ 0.17) × 10 -5between, these three groups of deoxidation effects are obviously better than other group time.
(3) deoxidation effect: measure before (1) middle test Al in molten steel 2o 3content is 2.3 × 10 -5, measure it and add oxygen level after wash heat agent, record oxygen level as shown in the table.
Comprehensively relatively upper table experimental data, known, Al in molten steel in 10min 2o 3content can be from 2.3 × 10 -5be down to (1.2 ~ 1.6) × 10 -5, after 35min, sulphur content is basicly stable in (0.5 ~ 0.8) × 10 -5between, illustrate that this wash heat agent dross inclusion adsorption is effective.
In above-mentioned data, the 3rd, 4,5 groups, Al after 20min 2o 3content is reduced to (0.9 ~ 1.0) × 10 -5, Al after 35min 2o 3content is basicly stable in (0.5 ~ 0.6) × 10 -5between, these three groups absorption are mingled with successful and are better than other group time.
(4) comparative example: from the above, the 4th group of embodiment effect is better than other group, in this comparative example test, A, B, C group replace with 11 parts of high-alumina cements respectively: A.4 part aluminum oxide, 7 parts of calcium aluminates; B.5 part aluminum oxide, 6 parts of calcium aluminates; C.6 part aluminum oxide, 7 parts of calcium aluminates.Respectively according to the method described above, detect sulphur content, oxygen level and Al wherein for above-mentioned molten steel 2o 3content, as shown in the table respectively:
Sulphur content:
Oxygen level:
Al 2o 3content:
From above-mentioned three tables, after 35min, sulphur content is in (0.28 ~ 0.29) × 10 -4, oxygen level is basicly stable in (0.22 ~ 0.24) × 10 -5, Al 2o 3content is basicly stable in (0.7 ~ 0.8) × 10 -5between, compared with proportioning of the present invention, there is gap in effect, and absorb inclusion successful of the present invention has reduced the inclusion content in molten steel to greatest extent, has remarkable effect to improving steel plate Enterprise Integrated economic benefit.

Claims (5)

1. a high efficiency composition wash heat agent, is characterized in that, its raw material (Wt%) comprising: calcium powder 49 ~ 70%, aluminium ash 20 ~ 45%, high-alumina cement 5 ~ 12%, Xylo-Mucine 0.5 ~ 2.0%.
2. high efficiency composition wash heat agent as claimed in claim 1, is characterized in that, the Chemical Composition (Wt%) of described high efficiency composition wash heat agent comprises: CaO 30 ~ 50%, Al 2o 320 ~ 40%, Al 2 ~ 6%, SiO 2≤ 8%, MgO≤6%, H 2o≤1%.
3. high efficiency composition wash heat agent as claimed in claim 1, is characterized in that, the raw material (Wt%) of described high efficiency composition wash heat agent comprises: calcium powder 55 ~ 65%, aluminium ash 22.5 ~ 35%, high-alumina cement 9.5 ~ 12%, Xylo-Mucine 0.5 ~ 2.0%.
4. high efficiency composition wash heat agent as claimed in claim 1, is characterized in that, the Chemical Composition (Wt%) of described high efficiency composition wash heat agent comprises: CaO 35.5 ~ 45%, Al 2o 323.5 ~ 32.7%, Al 2.8 ~ 3.9%, SiO 26.1 ~ 7.2%, MgO 4.7 ~ 5.5%, H 2o 0.53 ~ 0.82%.
5. high efficiency composition wash heat agent as described in claim 1 or 3, is characterized in that, the raw material requirement of described high efficiency composition wash heat agent is: calcium powder granularity 0 ~ 3mm, aluminium ash granularity 0 ~ 3mm, high-alumina cement granularity 150 orders.
CN201410140842.7A 2014-04-08 2014-04-08 High efficiency composition wash heat agent Expired - Fee Related CN104073598B (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113249548A (en) * 2021-05-13 2021-08-13 郑州东升冶金新材料有限公司 Preparation method of aluminum-calcium multifunctional slag washing material

Citations (6)

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Publication number Priority date Publication date Assignee Title
US3893846A (en) * 1972-07-05 1975-07-08 Aikoh Co Slag forming agent for steel making
CN1348995A (en) * 2001-09-11 2002-05-15 重庆工业高等专科学校 Composite molten steel refining additive
CN101545017A (en) * 2008-03-26 2009-09-30 上海梅山钢铁股份有限公司 Ladle slag modifying agent
CN101736132A (en) * 2009-12-31 2010-06-16 辽宁天和矿产有限公司 Sintering synthetic slag and production method thereof
CN102010939A (en) * 2010-12-30 2011-04-13 攀枝花钢城集团瑞钢工业有限公司 Molten steel refining slags and application thereof
US20120291591A1 (en) * 2011-05-16 2012-11-22 Weixue Xiao Agent for steel-making formed by aluminum-making slag

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3893846A (en) * 1972-07-05 1975-07-08 Aikoh Co Slag forming agent for steel making
CN1348995A (en) * 2001-09-11 2002-05-15 重庆工业高等专科学校 Composite molten steel refining additive
CN101545017A (en) * 2008-03-26 2009-09-30 上海梅山钢铁股份有限公司 Ladle slag modifying agent
CN101736132A (en) * 2009-12-31 2010-06-16 辽宁天和矿产有限公司 Sintering synthetic slag and production method thereof
CN102010939A (en) * 2010-12-30 2011-04-13 攀枝花钢城集团瑞钢工业有限公司 Molten steel refining slags and application thereof
US20120291591A1 (en) * 2011-05-16 2012-11-22 Weixue Xiao Agent for steel-making formed by aluminum-making slag

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113249548A (en) * 2021-05-13 2021-08-13 郑州东升冶金新材料有限公司 Preparation method of aluminum-calcium multifunctional slag washing material

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