CN102107265A - Ladle covering flux and use method thereof - Google Patents
Ladle covering flux and use method thereof Download PDFInfo
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- CN102107265A CN102107265A CN2009102487497A CN200910248749A CN102107265A CN 102107265 A CN102107265 A CN 102107265A CN 2009102487497 A CN2009102487497 A CN 2009102487497A CN 200910248749 A CN200910248749 A CN 200910248749A CN 102107265 A CN102107265 A CN 102107265A
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- molten steel
- ladle covering
- steel
- covering flux
- calcium carbide
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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
Abstract
The invention relates to a ladle covering flux for preventing temperature drop of the molten steel after treatment with a converter, which is characterized in that the ladle covering flux mainly consists of the following components in percentage by weight: 91-99% of lime and 1-9% of calcium carbide. In the use method of the ladle covering flux, 1-8 Kg of the ladle covering flux is added to every ton of molten steel, and the granularity is 0-100 mm. In the use method of the ladle covering flux, 1-8 Kg of the ladle covering flux is added to every ton of molten steel, and the granularity is 0-80 mm; the argon can blown after producing steel and in the process of transferring; and the upper limit of the argon flow is reached when the surface of the steel liquid does not turn. The ladle covering flux and use method provided by the invention have the advantages that: air isolation and heat preservation are ensured; the temperature drop in the process of transferring the molten steel is reduced through the exothermic reaction of calcium carbide in the covering flux and the oxygen in the molten steel, the electrode consumption is reduced, and the environment is protected; and as the calcium carbide further reacts with the oxygen and sulfur in the steel, the covering flux also has the effects of deoxidation and desulfurization.
Description
Technical field
The present invention relates to the molten steel process field of steelmaking process, prevent the ladle covering agent and the using method thereof of molten steel temperature drop behind particularly a kind of converter stove.
Background technology
It is to isolate molten steel and air that converter tapping adopts the main application of ladle covering agent, avoids the oxidation of molten steel, and plays certain insulation effect.But, ladle by converter in the transportation of refining position, the heat of molten steel transmits to air by ladle and top slag, thereby causes 30～50 ℃ temperature drop.In this case, behind the arrival refining position, need the long period heat temperature raising just can carry out refining treatment usually.
In the prior art, ladle covering agent is many based on desulfurization, deoxidation, make the ladle covering agent of molten steel heating also more rare, a kind of iron and steel composite desulfurizing agent is disclosed as: CN 1389580A (patent No. ZL 03112433.X) " iron and steel with composite desulfurizing agent and manufacture method thereof ", by 20～75% calcium oxide, 5～20% calcirm-fluoride, 10～60% calcium carbide and 3～10% brium carbonate are formed.Wherein calcium oxide and calcium carbide are through Passivation Treatment.Descend 20～60% than calcium carbide desulfurizing agent manufacturing cost; Owing to introduced brium carbonate, obviously improve the stability of sulfide in the desulfurization slag simultaneously, effectively prevented time sulphur phenomenon; Desulphurization reaction speed obviously improves, and desulfurized effect is good.The composition that adds in this patent mainly plays the effect of desulfurization, adds the composition role with this patent and is not quite similar.
CN 1389580A " pre-molten low-melting point composite calcium carbide desulfurizer and preparation method thereof " (02120745.3) discloses a kind of pre-molten low-melting point composite calcium carbide desulfurizer and preparation method thereof, formulated according to following component and ratio, calcium carbide 5～70%, calcium oxide 20～90%, calcirm-fluoride 3～10%, catalyst 0～10%.In advance calcium oxide is carried out Passivation Treatment, each component ratio is on request mixed again, melting in high temperature furnace through pulverizing, is prepared into graininess or desulfurizer powder then.Handle by fritting, the desulfurizing agent fusing point is reduced to 1250～1400 ℃, has obviously improved its desulfurization degree in molten iron (molten steel), has shortened reaction time and production cycle; Reaching under the situation of same desulfurized effect, its amount ratio mechanical mixture material has reduced more than 50%.The composition that adds in this patent mainly plays the effect of desulfurization, adds into the effect that branch plays with this patent and is not quite similar.
CN200710158085.6 " a kind of refined-smelting ladle furnace calcium carbide deoxidation method " relates to a kind of refined-smelting ladle furnace calcium carbide deoxidation method, straight carbon steel is replaced aluminium fully with calcium carbide forge.For low silicon aluminium killed steel and pipe line steel, add 0.4～0.8kg aluminium according to the slag system situation by steel per ton and forge, be to stir under the 500L/min at argon flow amount, the addition by ton steel 0.6～1.2kg adds calcium carbide again, carries out the slag making of calcium carbide deoxidation submerged arc.This invention can reduce Al
2O
3Be mingled with pollution, form foamed slag, help the slag making of LF stove submerged arc molten steel; And can reduce noise and the heat radiation of shielding molten steel, saves energy reduces consumption of electrode.Simultaneously, can reduce the molten aluminium of acid in the steel, reduce calcium line consumption; Reduce and to be mingled with enrichment, the generation of the flow phenomenon that effectively prevents to wad a quilt with cotton improves the inherent quality of steel billet.The composition that adds in this patent mainly plays the effect of deoxidation, and this patent mainly utilizes composition and the interactional exothermic reaction of the oxygen in the molten steel that is added, and slag and molten steel are heated, and reduces the temperature drop in the molten steel transport process.
Summary of the invention
The purpose of this invention is to provide a kind of ladle covering agent and using method thereof, the temperature drop problem behind the solution converter stove in the molten steel transportation is saved the required energy of post bake in the refining position, plays the effect of energy-conserving and environment-protective.
For solving the problems of the technologies described above, technical scheme of the present invention is:
A kind of ladle covering agent is characterized in that, mainly forms by weight percentage by following compositions, wherein:
Calcium-oxide content 〉=90%, magnesia+dioxide-containing silica＜8% 91～99%;
Calcium carbide calcium carbide content 〉=70%, calcium oxide＜25% 1～9%.
The using method of described a kind of ladle covering agent is added ladle covering agent behind converter tapping, its addition is molten steel 1～8Kg per ton, and granularity is 0～100mm.
The using method of described a kind of ladle covering agent is added ladle covering agent behind converter tapping, its addition is molten steel 2～5kg per ton, and granularity is 0～80mm, and tapping back and transport process can carry out Argon, and it is the upper limit that argon flow amount does not stir with the molten steel surface.
The mechanism of action: the present invention is by adding a certain amount of calcium carbide in lime, as molten steel covering agent, in the traditional function that guarantees air-isolation and insulation, exothermic reaction by calcium carbide in the coverture and steel water oxygen, the heat that discharges heats slag and molten steel, thereby reduces the temperature drop in the molten steel transport process.
Compared with prior art; the invention has the beneficial effects as follows: the present invention is in the traditional function that guarantees air-isolation and insulation; the heat that exothermic reaction discharged by calcium carbide in the coverture and steel water oxygen heats molten steel; thereby reduce the temperature drop in the molten steel transport process; save the energy; reduce electrode and material consumption, the protection environment.Simultaneously,, under the high relatively situation of sulfur content, have the function that removes sulphur in the steel, so this coverture has the effect of removing oxygen and desulfurization in the steel concurrently because of oxygen in calcium carbide and the steel and reaction of Salmon-Saxl.
The specific embodiment
The invention will be further described below in conjunction with specific embodiment:
Embodiment 1
Carbon content is 0.29% during converter tapping, liquid steel temperature is 1635 ℃, behind converter tapping, add ladle covering agent of the present invention steel 2.5Kg per ton in ladle, granularity is 0～80mm, and wherein lime accounts for 91% (calcium oxide content is 91%), calcium carbide accounts for 9% (calcium carbide content is 76%), be transported to refining furnace through behind the converter tapping, go into the stove thermometric and reach 1613 ℃, temperature drop is 22 ℃.
Embodiment 2
Carbon content is 0.15% during converter tapping, liquid steel temperature is 1628 ℃, behind converter tapping, add ladle covering agent of the present invention steel 3.5Kg per ton in ladle, granularity is 0～80mm, and wherein lime accounts for 94% (calcium oxide content is 91%), calcium carbide accounts for 6% (calcium carbide content is 76%), be transported to refining furnace through behind the converter tapping, go into the stove thermometric and reach 1602 ℃, temperature drop is 26 ℃.
Embodiment 3
Carbon content is 0.35% during converter tapping, liquid steel temperature is 1636 ℃, behind converter tapping, add ladle covering agent of the present invention steel 4.5Kg per ton in ladle, granularity is 0～80mm, and wherein lime accounts for 95.5% (calcium oxide content is 91%), calcium carbide accounts for 4.5% (calcium carbide content is 76%), be transported to refining furnace through behind the converter tapping, go into the stove thermometric and reach 1609 ℃, temperature drop is 27 ℃.
Embodiment 4
Carbon content is 0.18% during converter tapping, liquid steel temperature is 1637 ℃, behind converter tapping, add ladle covering agent of the present invention steel 5.0Kg per ton in ladle, granularity is 0～80mm, and wherein lime accounts for 99% (calcium oxide content is 91%), calcium carbide accounts for 1% (calcium carbide content is 76%), be transported to refining furnace through behind the converter tapping, go into the stove thermometric and reach 1605 ℃, temperature drop is 32 ℃.
For getting rid of the cooling effect of Argon to slag, the converter transportation in the foregoing description is not add a cover the insulation measure in whole process, and whole process is not carried out the Argon processing, carries out under the haulage time condition about equally.Tapping back and transport process can carry out Argon in the production, and it is the upper limit that argon flow amount does not stir with the molten steel surface, and general argon flow amount is 0～200L/min.
Facts have proved that with respect to 30～50 ℃ the temperature drop that the conventional steel covering agent is caused, transhipment temperature drop of the present invention is between 20～30 ℃, thus the energy and the material that consume during post bake when saving refining, the protection environment.
Compare with the refining process deoxidation purpose of patent CN200710158085.6 in the prior art (" a kind of refined-smelting ladle furnace calcium carbide deoxidation method "), the present invention is to reduce heat and scatter and disappear and to be main purpose with the insulation in the transport process of the refining position ladle of tapping, adopting calcium oxide and calcium carbide is main component, utilize the reaction of oxygen in calcium carbide and the steel to continue the slowly heat of release, reduce the temperature drop of molten steel, and the calcium carbide addition is less than its use amount as deoxidier.
The present invention adopted mechanical system that lime and calcium carbide are mixed before using, and need not do fritting and handle, and optionally lime and calcium carbide was done Passivation Treatment, prevented water absorbent surface, required oven dry before using, and fully removed moisture; Drop in the molten steel behind stove according to conventional method and to get final product.
Claims (3)
1. a ladle covering agent is characterized in that, mainly form by weight percentage by following compositions, wherein:
Calcium-oxide content 〉=90%, magnesia+dioxide-containing silica＜8% 91～99%;
Calcium carbide calcium carbide content 〉=70%, calcium oxide＜25% 1～9%.
2. the using method of a kind of ladle covering agent according to claim 1 is characterized in that, adds ladle covering agent behind converter tapping, and its addition is molten steel 1～8Kg per ton, and granularity is 0～100mm.
3. the using method of a kind of ladle covering agent according to claim 1, it is characterized in that, behind converter tapping, add ladle covering agent, its addition is molten steel 2～5kg per ton, granularity is 0～80mm, tapping back and transport process can carry out Argon, and it is the upper limit that argon flow amount does not stir with the molten steel surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102487497A CN102107265B (en) | 2009-12-25 | 2009-12-25 | Ladle covering flux and use method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102487497A CN102107265B (en) | 2009-12-25 | 2009-12-25 | Ladle covering flux and use method thereof |
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| CN102107265A true CN102107265A (en) | 2011-06-29 |
| CN102107265B CN102107265B (en) | 2013-05-29 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102652989A (en) * | 2012-05-10 | 2012-09-05 | 江苏大学 | Tundish molten steel covering agent for high-cleanness steel pouring and preparation method and application of tundish molten steel covering agent |
| CN104001892A (en) * | 2014-06-12 | 2014-08-27 | 鞍钢股份有限公司 | Method for adjusting tundish argon flow |
| CN109504818A (en) * | 2018-12-20 | 2019-03-22 | 首钢京唐钢铁联合有限责任公司 | A method of it controlling half steel in complete three de- techniques and smolders |
| CN115647313A (en) * | 2022-11-14 | 2023-01-31 | 鞍钢股份有限公司 | Steel ladle covering agent suitable for straightening SPHC steel grade and using method |
-
2009
- 2009-12-25 CN CN2009102487497A patent/CN102107265B/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102652989A (en) * | 2012-05-10 | 2012-09-05 | 江苏大学 | Tundish molten steel covering agent for high-cleanness steel pouring and preparation method and application of tundish molten steel covering agent |
| CN104001892A (en) * | 2014-06-12 | 2014-08-27 | 鞍钢股份有限公司 | Method for adjusting tundish argon flow |
| CN109504818A (en) * | 2018-12-20 | 2019-03-22 | 首钢京唐钢铁联合有限责任公司 | A method of it controlling half steel in complete three de- techniques and smolders |
| CN109504818B (en) * | 2018-12-20 | 2021-07-09 | 首钢京唐钢铁联合有限责任公司 | Method for controlling smoke emission of semisteel in full-three-removal process |
| CN115647313A (en) * | 2022-11-14 | 2023-01-31 | 鞍钢股份有限公司 | Steel ladle covering agent suitable for straightening SPHC steel grade and using method |
| CN115647313B (en) * | 2022-11-14 | 2023-08-18 | 鞍钢股份有限公司 | Ladle covering agent suitable for SPHC steel grade straight up and use method |
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| Publication number | Publication date |
|---|---|
| CN102107265B (en) | 2013-05-29 |
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