CN102344989A - Pretreatment method of molten iron for desulfurization by wire feeding method - Google Patents
Pretreatment method of molten iron for desulfurization by wire feeding method Download PDFInfo
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- CN102344989A CN102344989A CN2010102463315A CN201010246331A CN102344989A CN 102344989 A CN102344989 A CN 102344989A CN 2010102463315 A CN2010102463315 A CN 2010102463315A CN 201010246331 A CN201010246331 A CN 201010246331A CN 102344989 A CN102344989 A CN 102344989A
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Abstract
The invention relates to a pretreatment method of molten iron for desulfurization by a wire feeding method. A core-spun yarn coated with magnesium-base composite desulfurizer is placed on a pay-off spool of a wire feeding device, straightened and drawn out through a pay-off machine of the wire feeding device, penetrated into molten iron melt through a conduit to pretreat molten iron for desulphurization. The invention is characterized in that the distance between a port of the conduit and the liquid surface of the molten iron melt is 400-600mm, the wire feeding speed is 350-450m/min and the wire feeding time is 8-12 minutes when the molten iron amount for pretreatment and desulphurization is 60-80 tons and the molten iron temperature is 1300-1400 DEG C, The magnesium-base composite desulfurizer comprises the following components by mass%: 20-30% of magnesium, 40-50% of calcium oxide, 5-10% of silicon and 10-20% of alumina. The method of the invention can be used for industrial production, the desulfurization rate achieves 84%, and the method has the characteristics of no splash, little molten iron temperature reduction, short wire feeding time and less flue gas amount.
Description
Technical field
The present invention relates to a kind of method of molten iron pretreatment desulfurizing; Particularly relate to a kind of method with the injection feeding technology molten iron pretreatment desulfurizing; Promptly cover the cored-wire that magnesium base composite desulfurizing agent is processed with the strip ladle; By wire reel and feeding wire machine cored-wire is fed the inner a kind of molten iron pretreatment desulfurizing method of molten iron, belong to technical field of ferrous metallurgy.
Background technology
How to reduce cost of investment, exploitation efficiently, molten iron pretreatment desulfurizing technology easily, be the techno-economic question that iron and steel enterprise pays much attention to always.At present; The desulfurizing iron preconditioning technique that iron and steel metallurgical industry generally adopts is taken as the leading factor with winding-up; For example; Publication number is a kind of " pulvis of magnesium desulphurization method for molten iron pretreatment and use " that the Chinese invention patent application of CN101161828 provides; Be specifically related to the pulvis of magnesium desulphurization method for molten iron pretreatment and use; The pulvis that uses in the method comprises metal magnesium powder; Being characterised in that the pulvis that uses also comprises with blast furnace slag and lime is raw material; Through material choice; Removal of impurities is dry; Mix and pulverize; The pre-molten magnesium desulfurization promotor that operations such as Passivation Treatment make is carried out desulfurization according to certain mixed or composite blowing with MAGNESIUM METAL pulvis and pre-molten magnesium desulfurization promotor through existing blowing device in molten iron.Carry out desulphurization reaction in the molten iron owing to adopt spray gun under the pressure of carrier gas, the magnesium powder to be sprayed into, so there is following problem:
1., cost of investment is big, a cover injection system cost of investment is more than 1,000 ten thousand yuan;
2., material use efficiency is low, because carrier gas N in the winding-up process
2With the about magnesium metal more than 15% of the reaction meeting loss of magnesium powder, the factors such as splash when adding winding-up make the material effective rate of utilization very low, about about 60%;
3., temperature drop, energy consumption is big;
4., environmental pollution is serious the environmental pollutants that because the magnesium vapor that forms during winding-up is more than 2000 ℃, amount is big, temperature is high, be difficult to handle, carry secretly in the steam directly is discharged in the atmosphere, causes very overall situation to pollute.
Injection feeding technology is the refining techniques that grows up in the eighties in 20th century.Because this technology has easy and simple to handle, cheap device, characteristics such as labor aptitude is strong, yield of alloy is high, the dust incidence is low, accurate composition control, energy-conserving and environment-protective; Obtain fast development abroad; Like the TECPRO company of the SKW company of the Kubo field company of Japan, Germany, the U.S. and Bumham company etc., all handle magnesium iron Study on Technology, exploitation and application carrying out injection feeding technology.
Different according to line feeding link in the steel billet production process, can be divided into: 1. ladle feeding line, 2. tundish line feeding, 3. crystallizer line feeding.
Different according to the line feeding purpose, can be divided into:
1. deoxidation: aluminium wire, rare-earth wires or alloy silk.
2. alloying and trimming: CaSiBa core spun yarn, aluminium, titanium, boron, rare earth etc., improve metallographic structure, control inclusion morphology.
3. nodularization: magnesium base composite filament, Mg alloy wire etc.
4. desulfurization: CaSi silk, magnesium base composite filament etc.
Injection feeding technology is classified as key popularized project during China " 85 ", at present, unit produced by cored-wire and the feeding wire machine industrialization is ripe day by day in field of metallurgy.Injection feeding technology is ripe at aspects such as nodularization, molten iron alloyings, and has received good economic and social benefit.But this technology is badly in need of being applied and promoting in the field of molten iron pretreatment desulfurizing.
Because the problems referred to above have become enterprise development and the significant problem that hinders national economy sustainable development, so the efficient advanced desulfurizing iron preconditioning technique of development of new is one of problem of needing to be resolved hurrily of domestic steel industry.
Summary of the invention
The object of the invention just is to overcome the above-mentioned deficiency that prior art exists; Problem to existing injection feeding technology sulfur removal technology existence; Provided a kind of method with the injection feeding technology molten iron pretreatment desulfurizing capable of being industrialized; Promptly cover the cored-wire that magnesium base composite desulfurizing agent is processed, cored-wire is fed the inner a kind of molten iron pretreatment desulfurizing method of molten iron by wire reel and feeding wire machine with the strip ladle.
The technical solution that the present invention provides is: this method with the injection feeding technology molten iron pretreatment desulfurizing; Include by line feeding and unwrapping wire Yarn feeding device dimerous; To cover the core-spun yarn that magnesium base composite desulfurizing agent makes with the strip ladle places on the draw drum of Yarn feeding device; Paying out machine aligning through Yarn feeding device is pulled out; In conduit entering molten iron melt, carry out molten iron pretreatment desulfurizing; For addition and the wire-feeding velocity of controlling wire rod; The counter and the speed control that show feeding length also are housed on the said Yarn feeding device; Be characterized in that catheter port is 400-600mm apart from molten iron melt liquid level distance; 60～80 tons of the molten iron melt qualities of pretreatment desulfurizing, when the molten iron melt temperature is 1300-1400 ℃; Wire-feeding velocity is 350～450m/min; The line feeding time is 8～12 minutes; The composition of said magnesium base composite desulfurizing agent by quality % is: magnesium 20-30; Calcium oxide 40-50; Silicon 5-10, alundum (Al 10-20.
Be better to realize the object of the invention, saidly use the strip ladle to cover the cored-wire diameter that magnesium base composite desulfurizing agent processes to be 9-12mm that strip steel thickness is 0.4mm.
In the technical scheme that the present invention provides, for preventing the splash phenomenon in desulfurization, to occur, should guarantee that metal magnesium powder is no more than sweetening agent 30% (Mass%), and will control the metal magnesium powder granulometric range and can not surpass 1.5mm.
In the technical scheme that the present invention provides, should combine the ladle size (iron water amount) of steel mill to confirm wire-feeding velocity and line feeding time.
Compared with prior art, the invention has the beneficial effects as follows:
A, employing injection feeding technology desulfurization technology have successfully carried out industrial experiment in the 80t hot metal ladle, desulfurization degree reaches 84%, not splash, and hot metal temperature drop is little, and the line feeding time is short, and exhaust gas volumn is little.
B, multicomponent composite desulfate heart yearn have stronger sweetening power.
C, compare advance that possesses skills and economic reasonableness, characteristics such as the technology cost is low, easy and simple to handle, energy-saving and cost-reducing with blowing process.
Description of drawings
Accompanying drawing is a process flow diagram of the present invention.
Mark among the figure: 1. line feeding platform, 2. draw drum, 3. paying out machine, 4. conduit, 5. ladle lid, 6. cored-wire, 7. molten iron melt.
Specific embodiments
Combine accompanying drawing and embodiment at present, technical scheme of the present invention be described in detail:
20XX makes an experiment at certain steelworks, and heat examination 7 stoves are handled 487.2 tons of iron water amounts altogether, and desulfurization degree all reaches more than 84%; Technical indicator has reached the parameter request of steel mill; The splash phenomenon not taking place in the use, in iron ladle, operate steadily, meets the processing requirement of steel mill fully.
As shown in the figure; This method that the present invention provides with the injection feeding technology molten iron pretreatment desulfurizing; Include by line feeding and unwrapping wire Yarn feeding device dimerous; To cover on the draw drum that cored-wire 6 that magnesium base composite desulfurizing agent processes places Yarn feeding device 2 with the strip ladle; Paying out machine 3 alignings through Yarn feeding device are pulled out; In the molten iron melt 7 that conduit 4 gets in the hot metal ladle, carry out molten iron pretreatment desulfurizing, wherein conduit 4 ports are 450mm apart from molten iron melt 7 liquid levels distance.
The hot metal pretreatment working method:
A, hot metal ladle enter the station and chemically examine initial sulphur;
B, skim;
C, set wire-feeding velocity according to initial sulphur and target sulphur;
New slag is made on d, line feeding limit, limit;
E, skim;
F, chemical examination stop sulphur;
G, to converter;
The line feeding parameter
Magnesium base composite desulfurizing agent is formed
The line feeding operation
A, metal magnesium powder size range 0.3mm-1.5mm, Mg content be greater than 97%, and must carry out the passivation duration of fire resistance at 5-7 about second;
B, other raw material granularity scope 0-2.5mm;
C, carry out line feeding after various raw materials are proportionally stirred.
Claims (2)
1. method with the injection feeding technology molten iron pretreatment desulfurizing; Include by line feeding and unwrapping wire Yarn feeding device dimerous; To cover the cored-wire that magnesium base composite desulfurizing agent processes with the strip ladle places on the draw drum of Yarn feeding device; Paying out machine aligning through Yarn feeding device is pulled out; In conduit entering molten iron melt, carry out molten iron pretreatment desulfurizing; The counter and the speed controller that show feeding length also are housed on the said Yarn feeding device; It is characterized in that catheter port is 400-600mm apart from molten iron melt liquid level distance; 60～80 tons of the molten iron melt qualities of pretreatment desulfurizing; When the molten iron melt temperature is 1300-1400 ℃; Wire-feeding velocity is 350～450m/min; The line feeding time is 8～12 minutes; The composition of said magnesium base composite desulfurizing agent by quality % is: magnesium 20-30; Calcium oxide 40-50, silicon 5-10, aluminium sesquioxide 10-20.
2. the method with the injection feeding technology molten iron pretreatment desulfurizing according to claim 1 is characterized in that saidly using the strip ladle to cover the cored-wire diameter that magnesium base composite desulfurizing agent processes to be 9-12mm, and strip steel thickness is 0.4mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010246331 CN102344989B (en) | 2010-08-06 | 2010-08-06 | Pretreatment method of molten iron for desulfurization by wire feeding method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201010246331 CN102344989B (en) | 2010-08-06 | 2010-08-06 | Pretreatment method of molten iron for desulfurization by wire feeding method |
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| Publication Number | Publication Date |
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| CN102344989A true CN102344989A (en) | 2012-02-08 |
| CN102344989B CN102344989B (en) | 2013-05-29 |
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| CN 201010246331 Expired - Fee Related CN102344989B (en) | 2010-08-06 | 2010-08-06 | Pretreatment method of molten iron for desulfurization by wire feeding method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104498672A (en) * | 2014-12-29 | 2015-04-08 | 首钢水城钢铁（集团）有限责任公司 | Method for desulfurizing molten iron |
| CN113481350A (en) * | 2021-07-08 | 2021-10-08 | 通裕重工股份有限公司 | Ladle wire feeding desulfurization process and equipment |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1276435A (en) * | 1999-06-08 | 2000-12-13 | 湘潭钢铁集团有限公司 | Clad Mg-based wire and its application in external desulfurization of molten iron |
| CN1465733A (en) * | 2002-06-29 | 2004-01-07 | 包头文鑫实业有限公司 | Process for making core agent and core yarn of high magnesium alloy core-spun yarn |
| CN2808926Y (en) * | 2005-02-21 | 2006-08-23 | 包头翌新冶金技术有限公司 | Magnesium-wire cladded wire |
| CN101104197A (en) * | 2007-08-03 | 2008-01-16 | 钢铁研究总院 | Method for dispersion implanting fine heterogeneous particles during metal freezing course and added raw material |
| CN101319266A (en) * | 2008-07-17 | 2008-12-10 | 鞍钢股份有限公司 | Core cabling wire for outside-stove refining dephosphorization, removing fine foreign matter and its manufacturing method |
| CN101487076A (en) * | 2009-02-17 | 2009-07-22 | 郭庆成 | Core cabling wire for steel melting and preparation thereof |
-
2010
- 2010-08-06 CN CN 201010246331 patent/CN102344989B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1276435A (en) * | 1999-06-08 | 2000-12-13 | 湘潭钢铁集团有限公司 | Clad Mg-based wire and its application in external desulfurization of molten iron |
| CN1465733A (en) * | 2002-06-29 | 2004-01-07 | 包头文鑫实业有限公司 | Process for making core agent and core yarn of high magnesium alloy core-spun yarn |
| CN2808926Y (en) * | 2005-02-21 | 2006-08-23 | 包头翌新冶金技术有限公司 | Magnesium-wire cladded wire |
| CN101104197A (en) * | 2007-08-03 | 2008-01-16 | 钢铁研究总院 | Method for dispersion implanting fine heterogeneous particles during metal freezing course and added raw material |
| CN101319266A (en) * | 2008-07-17 | 2008-12-10 | 鞍钢股份有限公司 | Core cabling wire for outside-stove refining dephosphorization, removing fine foreign matter and its manufacturing method |
| CN101487076A (en) * | 2009-02-17 | 2009-07-22 | 郭庆成 | Core cabling wire for steel melting and preparation thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104498672A (en) * | 2014-12-29 | 2015-04-08 | 首钢水城钢铁（集团）有限责任公司 | Method for desulfurizing molten iron |
| CN113481350A (en) * | 2021-07-08 | 2021-10-08 | 通裕重工股份有限公司 | Ladle wire feeding desulfurization process and equipment |
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| Publication number | Publication date |
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| CN102344989B (en) | 2013-05-29 |
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Address after: West West Ring Road south of Dashiqiao yard of 115100 cities in Liaoning province Yingkou City Applicant after: Liaoning Yatai New Building Material Technology Co., Ltd. Address before: 115100, Yingkou, Liaoning City, Dashiqiao province Tiexi goods yard loop south Applicant before: Yingkou Yatai Chemical Co.,Ltd. |
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