CN105220102A - A kind of method extending the oxygen lance blow head life-span by reducing oxygen lance blow head dry slag - Google Patents
A kind of method extending the oxygen lance blow head life-span by reducing oxygen lance blow head dry slag Download PDFInfo
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- CN105220102A CN105220102A CN201510696819.0A CN201510696819A CN105220102A CN 105220102 A CN105220102 A CN 105220102A CN 201510696819 A CN201510696819 A CN 201510696819A CN 105220102 A CN105220102 A CN 105220102A
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- oxygen lance
- blow head
- lance blow
- boron nitride
- plasma gun
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
- C23C4/10—Oxides, borides, carbides, nitrides or silicides; Mixtures thereof
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/42—Constructional features of converters
- C21C5/46—Details or accessories
- C21C5/4606—Lances or injectors
- C21C5/4613—Refractory coated lances; Immersion lances
-
- 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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- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Mechanical Engineering (AREA)
- Plasma Technology (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention discloses a kind of method extending the oxygen lance blow head life-span by reducing oxygen lance blow head dry slag.The step of the method comprises: remove the organic dirt in copper oxygen lance blow head surface by vapor degreasing and purge, obtain clean oxygen lance blow head; The oxygen lance blow head of cleaning is fixed on preheating on anchor, and preheating temperature is 573K-723K; Adopt plasma gun spraying oxygen lance blow head surface, the peak power of plasma gun is 80kW, maximum current is 1000A, open circuit voltage 80V, argon gas is adopted boron nitride particle to be sent into plasma gun powder feeding mouth, boron nitride particle is ejected into oxygen lance blow head surface, obtains the oxygen lance blow head with boron nitride coating.The present invention makes boron nitride and copper oxygen lance blow head combine, form boron nitride coating, boron nitride coating is not only high temperature resistant, corrosion-resistant, and does not react with slag, thus the dry slag amount of oxygen lance blow head in minimizing convertor steelmaking process, extend the work-ing life of oxygen lance blow head.
Description
Technical field
The present invention relates to the oxygen lance blow head maintaining method used in converter steelmaking, particularly a kind of method extending the oxygen lance blow head life-span by reducing oxygen lance blow head dry slag.
Technical background
Bessemerizing the process middle and later periods, because oxygen lance position is too low or bath temperature is too high, in slag, iron oxide content sharply reduces, and slag fluidity is deteriorated, and then makes to melt or the slag of the partial melting knot that becomes sticky sticks together.Under the impact of air-flow, molten steel splashes and very easily sticks on oxygen lance blow head end face, accumulate on oxygen lance blow head, cause the oxygen lance blow head lost of life, affect converter operating rate, also can increase labor strength, and when process oxygen lance blow head dry slag, easily make oxygen lance blow head erosion corrosion, cause oxygen rifle to roll off the production line in advance, oxygen lance blow head is directly scrapped.Usually take the method spraying oxygen rifle to reduce oxygen lance blow head dry slag to extend the life-span of oxygen lance blow head at present, but fundamentally do not solve oxygen rifle dry slag problem, can not reach and reduce oxygen lance blow head dry slag to extend the object of life-span of oxygen lance.Open (bulletin) number: the CN1557897 of patent, discloses a kind of oxygen lance spray coating and equipment thereof, solves a difficult problem for metallurgy industry converter steelmaking pushing off the slag wall and the surperficial dry slag steel bonding at work of oxygen rifle.This oxygen lance spray coating with following component for raw material: Al
2o
3, SiC, C, MgO, CaO; Bonding agent: water glass, acetone, resin; Equipment spray gun used is made up of stuff-spraying pipe, feed-pipe, blast pipe valve and outer air duct, stuff-spraying pipe is connected with feed-pipe, arrange in stuff-spraying pipe between blast pipe and form cavity, be connected with blast pipe end by outer air duct, blast pipe is by connected Valve controlling inlet amount and air quantity.Although this invention can reduce oxygen rifle oxygen rifle dry slag phenomenon in steelmaking process to a certain extent; but complicated operation; use raw material is more; although protective layer can be defined on the surface at converter steelmaking pushing off the slag wall and oxygen rifle; the slag be stained with at work and molten steel major part can self fallings; but remaining slag and molten steel through manually shoveling with hammer drill, easily need injure oxygen lance blow head together with protective layer, the object of protection oxygen lance blow head can not be reached.
Summary of the invention
The object of this invention is to provide a kind of method extending the oxygen lance blow head life-span by reducing oxygen lance blow head dry slag.
Extend the method in oxygen lance blow head life-span by reducing oxygen lance blow head dry slag, the method comprises the following steps:
A. remove the organic dirt in copper oxygen lance blow head surface by vapor degreasing and purge, after cleaning terminates, baking copper oxygen lance blow head, obtains clean oxygen lance blow head;
B. the oxygen lance blow head of cleaning is fixed on preheating on anchor, preheating temperature is 573K-723K;
C. adopt plasma gun spraying oxygen lance blow head surface, the peak power of plasma gun is 80kW, and maximum current is 1000A, and open circuit voltage 80V, passes into argon gas in plasma gun, and argon flow amount is 8.3-8.5Lmin
-1, the gaseous media in plasma gun between negative electrode and anode nozzle produces lasting and strong ionization, and produces direct current arc, then is 11.6-11.7Lmin to the plasma (orifice) gas inlet guide inbound traffics of plasma gun
-1argon gas, direct current arc is ionized into the heating of this argon gas the argon plasma that medial temperature is 10000K, cold water is passed at the entrance of cooling water of plasma gun, cold water flows out from the cooling water outlet of plasma gun, the thermo-squeezing effect of cooling air film is there is in plasma gun, direct current arc is compressed and is ionized, formation temperature is the non-transfer type plasma arc of 14727 DEG C-19727 DEG C, diameter is that the boron nitride particle of 50 μm-70 μm sends into plasma gun powder feeding mouth, powder sending quantity 40-90gmin by employing argon gas
-1, boron nitride particle melts in plasma flame, acceleration, and is ejected into oxygen lance blow head surface, winding-up distance 20-50mm, the boron nitride coating thickness 5-20mm that oxygen lance blow head surface is formed;
D. oxygen lance blow head is cooled, obtain the oxygen lance blow head with boron nitride coating.
The present invention compared with existing similar technique, its significantly beneficial effect be embodied in:
The present invention makes boron nitride and copper oxygen lance blow head combine by mechanical bonding force, weak non-valence link interaction force and chemical bond force, makes the interface cohesion between profit phase and Copper substrate, enhances oxygen lance blow head moistened surface degree.Boron nitride coating is not only high temperature resistant, corrosion-resistant, and does not react with slag, thus reduces oxygen lance blow head dry slag amount in convertor steelmaking process, extends the work-ing life of oxygen lance blow head.
Accompanying drawing explanation
Fig. 1 is the plasma gun schematic diagram that a kind of method extending the oxygen lance blow head life-span by reducing oxygen lance blow head dry slag adopts.
Number in figure: 1-oxygen lance blow head anchor; 2-oxygen lance blow head; 3-front gun body; 4-cooling water outlet; The import of 5-plasma (orifice) gas; 6-insulation covering; 7-entrance of cooling water; 8-tungsten electrode; 9-rear lance; 10-powder feeding mouth; Between 11-negative electrode and anode nozzle; 12-power supply.
Embodiment
As shown in Figure 1, a kind of method extending the oxygen lance blow head life-span by reducing oxygen lance blow head dry slag, the step of the method is as follows:
The first step: by vapor degreasing and purge, removes all dirts in copper oxygen lance blow head surface, and after cleaning terminates, baking copper shower nozzle, obtains clean oxygen lance blow head;
Second step: the oxygen lance blow head sprayed in advance is fixed on oxygen lance blow head anchor 1, heats and be preheated to 723K;
3rd step: choose the plasma gun that peak power is 80kW, maximum current 1000A, open circuit voltage 80V.In plasma gun, pass into argon gas, argon flow amount is 8.4Lmin
-1, between negative electrode and anode nozzle, 11 is gaseous media with argon gas, lasting and strong ionization occurs, and produces direct current arc, then to import flow to plasma (orifice) gas import 5 be 11.6Lmin
-1argon gas, argon gas heats by direct current arc, and be ionized into the argon plasma that medial temperature is 10000K, cold water is passed at entrance of cooling water 7, cold water flows out from cooling water outlet 4, and direct current arc is compressed and ionized, and formation temperature is the non-transfer type plasma arc of 14727 DEG C-19727 DEG C, be the boron nitride particle feeding powder feeding mouth 10, powder sending quantity 50gmin of 60 μm by diameter with argon gas
-1, boron nitride particle melts in plasma flame, acceleration, is ejected into the surface of oxygen lance blow head 2, winding-up distance 30mm, and form boron nitride coating on the surface of oxygen lance blow head 2, coat-thickness is 5mm;
4th step: adopt the oxygen lance blow head after normal temperature cooling method cooling spraying, obtain the oxygen lance blow head with boron nitride coating.
Claims (1)
1. extending the method in oxygen lance blow head life-span by reducing oxygen lance blow head dry slag, it is characterized in that the method comprises the following steps:
A. remove the organic dirt in copper oxygen lance blow head surface by vapor degreasing and purge, after cleaning terminates, baking copper oxygen lance blow head, obtains clean oxygen lance blow head;
B. the oxygen lance blow head of cleaning is fixed on preheating on anchor, preheating temperature is 573K-723K;
C. adopt plasma gun spraying oxygen lance blow head surface, the peak power of plasma gun is 80kW, and maximum current is 1000A, and open circuit voltage 80V, passes into argon gas in plasma gun, and argon flow amount is 8.3-8.5Lmin
-1, the gaseous media in plasma gun between negative electrode and anode nozzle produces lasting and strong ionization, and produces direct current arc, then is 11.6-11.7Lmin to the plasma (orifice) gas inlet guide inbound traffics of plasma gun
-1argon gas, direct current arc is ionized into the heating of this argon gas the argon plasma that medial temperature is 10000K, cold water is passed at the entrance of cooling water of plasma gun, cold water flows out from the cooling water outlet of plasma gun, the thermo-squeezing effect of cooling air film is there is in plasma gun, direct current arc is compressed and is ionized, formation temperature is the non-transfer type plasma arc of 14727 DEG C-19727 DEG C, diameter is that the boron nitride particle of 50 μm-70 μm sends into plasma gun powder feeding mouth, powder sending quantity 40-90gmin by employing argon gas
-1, boron nitride particle melts in plasma flame, acceleration, and is ejected into oxygen lance blow head surface, winding-up distance 20-50mm, the boron nitride coating thickness 5-20mm that oxygen lance blow head surface is formed;
D. oxygen lance blow head is cooled, obtain the oxygen lance blow head with boron nitride coating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510696819.0A CN105220102B (en) | 2015-10-23 | 2015-10-23 | It is a kind of to extend the method in oxygen gun sprayer life-span by reducing oxygen gun sprayer dry slag |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510696819.0A CN105220102B (en) | 2015-10-23 | 2015-10-23 | It is a kind of to extend the method in oxygen gun sprayer life-span by reducing oxygen gun sprayer dry slag |
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| Publication Number | Publication Date |
|---|---|
| CN105220102A true CN105220102A (en) | 2016-01-06 |
| CN105220102B CN105220102B (en) | 2018-01-02 |
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| CN201510696819.0A Active CN105220102B (en) | 2015-10-23 | 2015-10-23 | It is a kind of to extend the method in oxygen gun sprayer life-span by reducing oxygen gun sprayer dry slag |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105506217A (en) * | 2016-01-22 | 2016-04-20 | 河北钢铁股份有限公司邯郸分公司 | Method for online rapid cleaning of converter lance bonded steel slag |
| CN106591531A (en) * | 2016-12-09 | 2017-04-26 | 河钢股份有限公司承德分公司 | Method for preventing converter oxygen lances from adhering to steel slag |
| CN108588312A (en) * | 2018-04-23 | 2018-09-28 | 山西太钢不锈钢股份有限公司 | A method of processing blast furnace spray gun slagging |
| KR20200135611A (en) * | 2019-05-22 | 2020-12-03 | 주식회사 에스유케이 | Injection apparatus for internal plasma spray gun |
| CN112593042A (en) * | 2020-12-14 | 2021-04-02 | 中国兵器工业第五九研究所 | High-temperature protective coating for end face of oxygen lance nozzle and preparation method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102605135A (en) * | 2012-03-21 | 2012-07-25 | 沈阳东冶汉森冶金装备有限公司 | Converter cone oxygen lance with surface coating |
| EP2464757B1 (en) * | 2009-08-10 | 2013-08-07 | SMS Siemag AG | Lance for a smelting vessel system or a metallurgical reaction vessel |
| CN104141029A (en) * | 2013-05-10 | 2014-11-12 | 江苏博际喷雾系统有限公司 | Large-taper composite coat cone oxygen gun |
-
2015
- 2015-10-23 CN CN201510696819.0A patent/CN105220102B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2464757B1 (en) * | 2009-08-10 | 2013-08-07 | SMS Siemag AG | Lance for a smelting vessel system or a metallurgical reaction vessel |
| CN102605135A (en) * | 2012-03-21 | 2012-07-25 | 沈阳东冶汉森冶金装备有限公司 | Converter cone oxygen lance with surface coating |
| CN104141029A (en) * | 2013-05-10 | 2014-11-12 | 江苏博际喷雾系统有限公司 | Large-taper composite coat cone oxygen gun |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105506217A (en) * | 2016-01-22 | 2016-04-20 | 河北钢铁股份有限公司邯郸分公司 | Method for online rapid cleaning of converter lance bonded steel slag |
| CN106591531A (en) * | 2016-12-09 | 2017-04-26 | 河钢股份有限公司承德分公司 | Method for preventing converter oxygen lances from adhering to steel slag |
| CN108588312A (en) * | 2018-04-23 | 2018-09-28 | 山西太钢不锈钢股份有限公司 | A method of processing blast furnace spray gun slagging |
| CN108588312B (en) * | 2018-04-23 | 2019-11-26 | 山西太钢不锈钢股份有限公司 | A method of processing blast furnace spray gun slagging |
| KR20200135611A (en) * | 2019-05-22 | 2020-12-03 | 주식회사 에스유케이 | Injection apparatus for internal plasma spray gun |
| CN112593042A (en) * | 2020-12-14 | 2021-04-02 | 中国兵器工业第五九研究所 | High-temperature protective coating for end face of oxygen lance nozzle and preparation method thereof |
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| CN105220102B (en) | 2018-01-02 |
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Effective date of registration: 20190509 Address after: 056351 East of Dahezhuang Village, Wu'an Wuji Town, Handan City, Hebei Province Patentee after: HEBEI WENFENG IRON AND STEEL Co.,Ltd. Address before: No. 185, Qianshan Road, Anshan high tech Zone, Liaoning Province Patentee before: University of Science and Technology Liaoning |
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Effective date of registration: 20221107 Address after: 056300 east of Chongyi village, Shangtuan urban and rural areas, Wu'an city, Handan City, Hebei Province Patentee after: Jinan Iron and Steel Group Co.,Ltd. Address before: 056351 East of Dahezhuang Village, Wu'an Wuji Town, Handan City, Hebei Province Patentee before: HEBEI WENFENG IRON AND STEEL Co.,Ltd. |