CN105200192A - Liquid steel refining slag and preparation method and application thereof - Google Patents

Liquid steel refining slag and preparation method and application thereof Download PDF

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Publication number
CN105200192A
CN105200192A CN201510711839.0A CN201510711839A CN105200192A CN 105200192 A CN105200192 A CN 105200192A CN 201510711839 A CN201510711839 A CN 201510711839A CN 105200192 A CN105200192 A CN 105200192A
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refining slag
liquid steel
steel refining
recrement
note
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CN105200192B (en
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冉孟伦
张敏
曾建华
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Pangang Group Panzhihua Iron and Steel Research Institute Co Ltd
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Pangang Group Panzhihua Iron and Steel Research Institute 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
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

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Abstract

The invention relates to a liquid steel refining slag and a preparation method and an application thereof, and belongs to the field of metallurgy. The liquid steel refining slag provided by the invention has the chemical composition by weight: 30-40% of CaO, 25-35% of MAl, 2-4% of SiO2, and 15-25% of Al2O3, wherein the alkalinity is controlled to be 6-13. The produced pre-molten type calcium aluminate refining slag is quick to slag and strong in deoxygenation desulfurization abilities.

Description

Liquid steel refining slag and its preparation method and application
Technical field
The present invention relates to a kind of liquid steel refining slag and its preparation method and application, belong to field of metallurgy.
Background technology
At present, vanadium iron smelt after tailings be mainly used in the production field of resistance to material or directly discard, note recrement is also most discarded or for building trade, its utilization ratio is lower, and can not give full play to the metallurgical characteristics of such slag, causes waste serious and causes environmental pollution.The existing utilization to these waste residues has following public technology:
Patent application 1: " Vanadium iron slag runner castable ", application number: 201310121595.1.The feature of the method is: the ferrovanadium dregs produced when producing vanadium iron is carried out recycling and produces slag runner mould material, heat-shock resistance and the resistance to slag corrosion of mould material are better, and practical life is longer.
Patent application 2: " low silicon aluminium killed steel residual casting slag base refining agent and preparation method thereof ", application number: 201110199195.3; The method is: with low silicon aluminium killed steel note recrement 86 ~ 96%, and fluorite 1 ~ 6%, aluminium powder 3 ~ 8%, inorganic bonding agent 2 ~ 4% is raw material production refining agent, and control basicity 5 ~ 6, for LF refining slag making, slagging is effective, and finished product sulphur controls at below 50ppm.
Patent application 1 is also a kind of resource utilization method of vanadium iron tailings, with vanadium iron tailings for raw material production refractory materials, takes full advantage of its Al 2o 3the feature high, refractoriness is good, reduces the discharge of tailings; But for refractory materials, the metallic aluminium be rich in tailings can not be made full use of.Low silicon aluminium killed steel note recrement is reclaimed in patent application 2, and be then main material production refining agent with it, slagging is effective, desulfuration efficiency is high, and finished product sulphur is at below 50ppm, but its basicity 5 ~ 6 is relatively low, metal aluminum content 3 ~ 8%, also lower, to the deoxidization desulfuration limited efficiency of slag.
Summary of the invention
The present invention is directed to above-mentioned defect, there is provided a kind of with vanadium iron tailings with note recrement jointly as the refining slag that Raw material processing becomes, not only efficient synthetical recovery solid waste, reduces discharge, has also fully fully utilized physics and chemistry feature (pre-molten, the high Al of 2 kinds of tailings 2o 3content, alkalescence, be rich in metallic aluminium etc.), the preliminary melting type calcium aluminate system refining slag slagging of production is fast, deoxidization desulfuration ability is strong.
Technical scheme of the present invention:
First technical problem that the present invention will solve is to provide a kind of liquid steel refining slag, and its chemical composition and weight proportion thereof are: CaO30 ~ 40%, MAl25 ~ 35%, SiO 22 ~ 4%, Al 2o 315 ~ 25%, its basicity controls 6 ~ 13.
Further, the granularity of described liquid steel refining slag is 25 ~ 60mm.
Further, above-mentioned liquid steel refining slag forms so that following each mixed raw material is standby, and each raw material and weight proportion thereof are:
Vanadium iron tailings 22 ~ 28 parts, note recrement 18 ~ 25 parts, aluminium powder 28 ~ 35 parts, 20 ~ 25 parts, lime, binding agent≤3 part.
Further, the composition of described vanadium iron tailings meets: CaO12 ~ 20wt%, MgO10 ~ 20wt%, MAl3 ~ 8wt%, Al 2o 360 ~ 70wt%.
The composition of described note recrement meets: CaO32 ~ 52wt%, MgO4 ~ 11wt%, SiO 212 ~ 30wt%, Al 2o 310 ~ 25wt%.
The particle diameter < 3mm of described vanadium iron tailings and note recrement.
Described vanadium iron tailings is the tailings that smelting ferrovanadium produces; Described note recrement is that pouring molten steel terminates rear remaining tailings.
Described binding agent is selected from least one in lignin, cellulose family, dextrin class, water glass class.
Second technical problem that the present invention will solve is to provide the preparation method of above-mentioned liquid steel refining slag: by vanadium iron tailings, note recrement, aluminium powder, lime and binding agent stirring and evenly mixing, then coldmoulding, be drying to obtain described liquid steel refining slag; Wherein, the weight proportion of each raw material is: vanadium iron tailings 22 ~ 28 parts, note recrement 18 ~ 25 parts, aluminium powder 28 ~ 35 parts, 20 ~ 25 parts, lime, binding agent≤3 part.
The 3rd technical problem that the present invention will solve is to provide the using method of above-mentioned liquid steel refining slag, adds in ladle in converter tapping or refining process, and for pre-deoxidation steel, its add-on is liquid steel refining slag described in 2 ~ 3kg/t steel; For high-grade pipe line steel, its add-on is liquid steel refining slag described in 3 ~ 5kg/t steel.
The 4th technical problem that the present invention will solve is to provide the recoverying and utilizing method of vanadium iron tailings and note recrement, be used for preparing liquid steel refining slag, be specially: by composite to vanadium iron tailings, note recrement and aluminium powder, lime, outer adding additives stirring and evenly mixing, then coldmoulding, be drying to obtain liquid steel refining slag; The weight proportion of each raw material is: vanadium iron tailings 22 ~ 28 parts, note recrement 18 ~ 25 parts, aluminium powder 28 ~ 35 parts, 20 ~ 25 parts, lime, binding agent≤3 part.Described binding agent is selected from least one in lignin, cellulose family, dextrin class, water glass class.
Beneficial effect of the present invention:
The tailings that smelting ferrovanadium produces by the present invention and pouring molten steel terminate rear remaining note recrement and carry out crushing and screening, with addition of a certain amount of aluminium powder and lime, develop a kind of liquid steel refining slag efficiently, not only achieve the comprehensive utilization of resources to metallurgical tailings such as vanadium iron tailings and note recrements, while the discharge reducing solid waste, also can carry out efficient deoxidization desulfuration to slag and removal is mingled with.
Embodiment
Present invention applicant carries out serious analysis to 2 kinds of tailings, makes full use of pre-fusibleness Al in vanadium iron tailings 2o 3content is high and containing the feature of a certain amount of metallic aluminium, and pre-molten note recrement is the situation of alkalescence, and these 2 kinds of tailings are made refining slag as raw material jointly.Add in converter tapping or refining process in ladle, can rapid slagging, and participate in deoxidization desulfuration, pre-deoxidation steel adds 2 ~ 3kg/t steel, FeO content in slag can be made to drop to 7% from 18%, high-grade pipe line steel adds 3 ~ 5kg/t steel, can be taken off to below 10ppm by sulphur in steel within 45min by 0.005%.
Vanadium iron tailings of the present invention, wherein fritting Al 2o 3content is high, and as refining slag, its slagging speed is fast, and containing a certain amount of metallic aluminium, can participate in deoxidization desulfuration in refining slag, its main component is: CaO12 ~ 20%, MgO10 ~ 20%, MAl3 ~ 8%, Al 2o 360 ~ 70%.
Note recrement of the present invention is pre-melt, and in alkalescence, its main component is: CaO32 ~ 52%, MgO4 ~ 11%, SiO 212 ~ 30%, Al 2o 310 ~ 25%.
The present invention is with vanadium iron tailings and note recrement jointly for the preliminary melting type calcium aluminate system refining slag of raw material production, and its main component is: CaO30 ~ 40%, MAl25 ~ 35%, SiO 22 ~ 4%, Al 2o 315 ~ 25%, basicity controls 6 ~ 13.Add in converter tapping or refining process in ladle, pre-deoxidation steel adds 2 ~ 3kg/t steel, and FeO content in slag can be made to drop to 7% from 18%, and high-grade pipe line steel adds 3 ~ 5kg/t steel, can be taken off to below 10ppm by sulphur in steel within 45min by 0.005%.
Below in conjunction with embodiment, the specific embodiment of the present invention is further described, does not therefore limit the present invention among described scope of embodiments.
Embodiment 1
The preparation of liquid steel refining slag (preliminary melting type calcium aluminate system refining slag), comprises the steps:
1) tailings produced by smelting ferrovanadium and pouring molten steel terminate rear remaining note recrement and carry out crushing and screening, leave for subsequent use of below 3mm; The chemical composition of vanadium iron tailings used and note recrement is as shown in table 1;
2) get raw material vanadium iron tailings, note recrement, aluminium powder and lime, the polymer organic starch gelatinization compound binding agent with addition of 1% carries out stirring and evenly mixing and must mix raw material; The weight proportion relation of each raw material is as shown in table 2;
3) above-mentioned mixing material is carried out coldmoulding, granularity is 25 ~ 60mm;
4) namely final drying obtains steel-making refining refining slag, and its basicity is 8.
Embodiment 2-4
The preparation process of refining slag is with embodiment 1, and just each proportioning raw materials and composition difference, concrete raw material parameter is see table 1 and table 2.The basicity of gained refining slag is respectively: 6 (embodiments 2), 7 (embodiments 3), 13 (embodiments 4).
Table 1 vanadium iron tailings and note recrement main component
Table 2 prepares feed composition and the weight percent thereof of preliminary melting type calcium aluminate system refining slag
Embodiment Vanadium iron tailings Note recrement Aluminium powder Lime Binding agent
1 22 22 35 20 1
2 28 18 28 25 1
3 24 25 30 20 1
4 22 23 32 22 1
Embodiment 5
Embodiment 1 gained liquid steel refining slag is used for the deoxidation of pre-deoxidation steel slag, detailed process is:
1) tapping process does not carry out deoxidation alloying, slag-stopping tapping;
2) tap between 1/3 to 1/2 and add 0.8 ~ 1.5Kg.t -1quickened lime;
3) LF refining process adds 0.2 ~ 0.5Kg.t -1quickened lime;
4) LF refining terminates to add refining slag 1 ~ 4Kg.t of the present invention in rear 3min -1.
After using embodiment of the present invention refining slag, the FeO content in pre-deoxidation steel slag is as shown in table 3;
In addition, we have also investigated the deoxidation effect of existing technique to same steel grade, and namely it with the addition of quickened lime, slag supplying agent and aluminum shot in pre-deoxidation process, and sludging time is 5min, and its deoxidation result is as shown in table 3.
In table 3 of the present invention and table 4, the main component of slag supplying agent is: CaO30 ~ 40%, MAl5 ~ 10%, SiO 215 ~ 25%, Al 2o 315 ~ 25%, basicity is 2 ~ 3.
Table 3 gained refining slag of the present invention is to the deoxidation of pre-deoxidation steel slag
Embodiment 6-8
Application method with embodiment 5, only the add-on of quickened lime and refining slag and sludging time different, Specific amounts is as shown in table 3.Deoxidation effect after refining is as shown in table 3.
Embodiment 9
Embodiment 1 gained liquid steel refining slag is used for the desulfurization of high-grade pipe line steel, detailed process is:
1) slag-stopping tapping, tapping process adds 1 ~ 1.5Kg.t -1quickened lime;
2), after tapping terminates, in ladle, 0.5 ~ 2Kg.t is added -1refining slag of the present invention;
3) after LF enters the station, first add thermalization slag, start after 5min to add refining slag of the present invention;
4) refining slag is carried out and is added in batches, often criticizes add-on and is no more than 0.5Kg.t -1, in the process, can 0.5 ~ 1.0Kg.t be added -1quickened lime, until refining terminates.
After using embodiment of the present invention refining slag, after high-grade pipe line steel desulfurization, gained finished product sulphur content is as shown in table 4;
In addition, we have also investigated the sweetening effectiveness of existing technique to same steel grade, and namely it with the addition of quickened lime, slag supplying agent and aluminum shot in pre-sweetening process, and desulfurization time is 50min, and its desulfurization results is as shown in table 4.
Table 4 gained refining slag of the present invention is to the desulfurization of high-grade pipe line steel
Embodiment 10-12
Application method with embodiment 9, only the add-on of quickened lime and refining slag and desulfurization time different, Specific amounts is as shown in table 4.Sweetening effectiveness after refining is as shown in table 4.

Claims (10)

1. liquid steel refining slag, is characterized in that, its chemical composition and weight proportion thereof are: CaO30 ~ 40%, MAl25 ~ 35%, SiO 22 ~ 4%, Al 2o 315 ~ 25%, its basicity controls 6 ~ 13.
2. liquid steel refining slag according to claim 1, is characterized in that, the granularity of described liquid steel refining slag is 25 ~ 60mm.
3. liquid steel refining slag according to claim 1 and 2, is characterized in that, described liquid steel refining slag forms by following each mixed raw material is standby, and each raw material and weight proportion thereof are:
Vanadium iron tailings 22 ~ 28 parts, note recrement 18 ~ 25 parts, aluminium powder 28 ~ 35 parts, 20 ~ 25 parts, lime, binding agent≤3 part.
4. liquid steel refining slag according to claim 3, is characterized in that,
The composition of described vanadium iron tailings meets: CaO12 ~ 20wt%, MgO10 ~ 20wt%, MAl3 ~ 8wt%, Al 2o 360 ~ 70wt%; Or
The composition of described note recrement meets: CaO32 ~ 52wt%, MgO4 ~ 11wt%, SiO 212 ~ 30wt%, Al 2o 310 ~ 25wt%.
5. the liquid steel refining slag according to claim 3 or 4, is characterized in that, the particle diameter < 3mm of described vanadium iron tailings and note recrement.
6. the liquid steel refining slag according to any one of claim 3 ~ 5, is characterized in that, described binding agent is selected from least one in lignin, cellulose family, dextrin class, water glass class.
7. the preparation method of the liquid steel refining slag described in any one of claim 1 ~ 6, is characterized in that, by vanadium iron tailings, note recrement, aluminium powder, lime and binding agent stirring and evenly mixing, then coldmoulding, is drying to obtain described liquid steel refining slag; Wherein, the weight proportion of each raw material is: vanadium iron tailings 22 ~ 28 parts, note recrement 18 ~ 25 parts, aluminium powder 28 ~ 35 parts, 20 ~ 25 parts, lime, binding agent≤3 part.
8. the using method of liquid steel refining slag, is characterized in that, adds in ladle in converter tapping or refining process by liquid steel refining slag, and for pre-deoxidation steel, its add-on is liquid steel refining slag described in 2 ~ 3kg/t steel; For high-grade pipe line steel, its add-on is liquid steel refining slag described in 3 ~ 5kg/t steel; Described liquid steel refining slag is the liquid steel refining slag described in any one of claim 1 ~ 6, or the liquid steel refining slag obtained by method according to claim 7.
9. the recoverying and utilizing method of vanadium iron tailings and note recrement, it is characterized in that, prepare liquid steel refining slag with vanadium iron tailings and note recrement, composite by vanadium iron tailings, note recrement and aluminium powder, lime, outer adding additives stirring and evenly mixing, then coldmoulding, be drying to obtain liquid steel refining slag; The weight proportion of each raw material is: vanadium iron tailings 22 ~ 28 parts, note recrement 18 ~ 25 parts, aluminium powder 28 ~ 35 parts, 20 ~ 25 parts, lime, binding agent≤3 part.
10. the recoverying and utilizing method of vanadium iron tailings according to claim 9 and note recrement, is characterized in that, the composition of described vanadium iron tailings meets: CaO12 ~ 20wt%, MgO10 ~ 20wt%, MAl3 ~ 8wt%, Al 2o 360 ~ 70wt%; The composition of described note recrement meets: CaO32 ~ 52wt%, MgO4 ~ 11wt%, SiO 212 ~ 30wt%, Al 2o 310 ~ 25wt%.
CN201510711839.0A 2015-10-28 2015-10-28 Liquid steel refining slag and its preparation method and application Active CN105200192B (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107119173A (en) * 2017-05-02 2017-09-01 攀钢集团西昌钢钒有限公司 A kind of slag adjusting agent and preparation method thereof
CN109338044A (en) * 2018-12-18 2019-02-15 攀枝花钢城集团有限公司 Pre-melted refining slag and preparation method thereof
CN111334644A (en) * 2020-03-11 2020-06-26 攀钢集团攀枝花钢铁研究院有限公司 Fluorine-free refining fluxing slag melting agent and preparation and use method thereof

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Publication number Priority date Publication date Assignee Title
CN101928807A (en) * 2010-08-13 2010-12-29 武汉钢铁(集团)公司 Method for refining high carbon molten steel by using low aluminum steel casting residue
CN102409140A (en) * 2010-09-26 2012-04-11 宝山钢铁股份有限公司 Refined slag used in steel-making process for bearing steel
CN102876839A (en) * 2011-07-15 2013-01-16 武汉钢铁(集团)公司 Low-silicon-aluminum-killed-steel-casting-slag-based refining agent and preparation method thereof
CN103374642A (en) * 2012-04-25 2013-10-30 宝山钢铁股份有限公司 De-oxidation modifying agent for steel ladle top slag

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101928807A (en) * 2010-08-13 2010-12-29 武汉钢铁(集团)公司 Method for refining high carbon molten steel by using low aluminum steel casting residue
CN102409140A (en) * 2010-09-26 2012-04-11 宝山钢铁股份有限公司 Refined slag used in steel-making process for bearing steel
CN102876839A (en) * 2011-07-15 2013-01-16 武汉钢铁(集团)公司 Low-silicon-aluminum-killed-steel-casting-slag-based refining agent and preparation method thereof
CN103374642A (en) * 2012-04-25 2013-10-30 宝山钢铁股份有限公司 De-oxidation modifying agent for steel ladle top slag

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107119173A (en) * 2017-05-02 2017-09-01 攀钢集团西昌钢钒有限公司 A kind of slag adjusting agent and preparation method thereof
CN109338044A (en) * 2018-12-18 2019-02-15 攀枝花钢城集团有限公司 Pre-melted refining slag and preparation method thereof
CN111334644A (en) * 2020-03-11 2020-06-26 攀钢集团攀枝花钢铁研究院有限公司 Fluorine-free refining fluxing slag melting agent and preparation and use method thereof

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