CN115323100B - Method for reducing slag sticking of oxygen lance in converter smelting - Google Patents
Method for reducing slag sticking of oxygen lance in converter smelting Download PDFInfo
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- CN115323100B CN115323100B CN202210904838.8A CN202210904838A CN115323100B CN 115323100 B CN115323100 B CN 115323100B CN 202210904838 A CN202210904838 A CN 202210904838A CN 115323100 B CN115323100 B CN 115323100B
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- lance
- oxygen lance
- oxygen
- slag
- converter
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- 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
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- 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
- C21C5/30—Regulating or controlling the blowing
-
- 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)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The invention relates to a method for reducing slag sticking of an oxygen lance in converter smelting, which comprises the following steps: 1) Coating lime powder on the surface of the oxygen lance head after threading; si content in molten iron is more than or equal to 0.4%; scrap ratio <10%, scrap ratio = scrap weight/(scrap weight + molten iron weight); 2) Smelting: the gun position is kept at 250-290 cm within the period of 0-5 min, the total amount of the added iron ore is 2/3, and the rest iron ore is added when the re-drying occurs in the middle smelting stage; in the time period of 5-10 min, adding 1-3 kg/ton of molten steel into iron ore each time, and repeating the low-high lance position operation for 1-3 times; slowly lowering the gun and pulling carbon in a time period after 10 min; 3) And (5) operating the space furnace at intervals. The advantages are that: the method has the advantages that the equipment is not transformed, the refractory material of the furnace body is not damaged, the slag sticking on the surface of the oxygen lance is reduced, and the labor intensity of workers for digging slag or cutting the slag of the oxygen lance is reduced by the new methods of raw material preparation, smelting process control, empty furnace time operation and the like.
Description
Technical Field
The invention belongs to the field of ferrous metallurgy, and particularly relates to a method for reducing slag sticking of an oxygen lance in converter smelting.
Background
In the production of the converter, the oxygen lance provides oxygen required by the production for the converter to complete smelting tasks, and the method comprises the following steps: the temperature rise, decarburization, desulfurization, dephosphorization and the like are the most important production equipment, most of the time of the operation of the oxygen lance needs to be in contact with molten steel and slag, converter slag is easy to adhere to the surface, once the converter slag is excessive, peripheral equipment is easy to scratch, if excessive converter slag is also easy to lift, a water jacket of the oxygen lance cannot be lifted, and serious accidents of production shutdown are caused, so that a set of simple and feasible production method is required to be provided to reduce the occurrence of converter slag.
In the prior art, patent application number CN20151378473. X discloses a multifunctional converter oxygen lance slag scraper and a using method thereof, wherein the number of the multifunctional converter oxygen lance slag scraper is 2 and more slag scraping parts are distributed around an oxygen lance, the blade of a scraper is the same as the curvature of a lance body of the oxygen lance, the device not only has slag scraping effect but also has spraying effect, the device has simple structure and reasonable design, is convenient to operate, can reduce slag sticking of the oxygen lance and effectively remove the binding object of the oxygen lance through the device and the using method, reduces the auxiliary operation time of manually processing the slag sticking of an operator, lightens the working intensity of the operator and improves the working efficiency.
Patent application number CN201610042927.0 discloses a method for cleaning converter oxygen lance bonding steel slag on line, after converter tapping is finished, all slag in the converter is quickly poured out, the oxygen lance is lowered into a hearth, the lance position is adjusted, the oxygen lance bonding steel slag is baked by using the temperature of the hearth of the converter, oxygen is started, high-speed oxygen sprayed by the oxygen lance is reflected by the hearth to wash red and hot steel slag on the lance body, and therefore the purposes of melting loss and falling of the bonded steel slag of the lance body are achieved on the premise of not damaging the converter lining. The invention can clean the steel slag adhered to the oxygen lance of the converter on line rapidly, greatly reduces the influence time of the accident of adhering the lance, effectively avoids the technical problem of corrosion to the converter lining when cleaning the steel slag adhered to the outer layer steel pipe of the oxygen lance, reduces the labor intensity and maintenance cost of the maintenance of the oxygen lance, and prolongs the service life of the oxygen lance and the converter.
However, the above patents have problems: the equipment is used for mechanically scraping slag, the site transformation is needed, and meanwhile, the slag scraping equipment is easy to scrape askew due to instability when the oxygen lance goes upwards, so that the equipment is required to be overhauled and maintained. In the second method, slag of the oxygen lance body is gasified by blowing oxygen into the furnace, and dolomite and the like are added to carry out thick slag, but the slag also has an erosion effect on the furnace body, and when the furnace bottom is thinner, the method is easy to cause production accidents of furnace bottom leakage.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a method for reducing the slag sticking of an oxygen lance in converter smelting, improve the operation method and reduce the slag sticking of the oxygen lance.
In order to achieve the above purpose, the present invention is realized by the following technical scheme:
a method for reducing slag sticking of an oxygen lance in converter smelting, comprising the following steps:
1) Oxygen lance preparation: coating lime powder on the surface of the oxygen lance tip after threading, and coating the lime powder on the surface of more than 95% of the area of the lance tip;
2) Raw material preparation: si content in molten iron is more than or equal to 0.4%; scrap ratio <10%, scrap ratio = scrap weight/(scrap weight + molten iron weight);
3) Smelting early stage: after the blowing and the firing are carried out for 0 to 5min, the gun position is kept at 250 to 290cm, the first batch of flux is added within 2min, the total amount of the added iron ore is 2/3, and the rest iron ore is added when the back drying occurs in the middle smelting stage;
4) Mid-converting: in the time period of 5-10 min, adding 1-3 kg/ton of molten steel into iron ore each time, adding the molten steel while lifting the lance to 280-300 cm, stopping adding the ore after foam slag is visible at the uppermost edge of a furnace mouth, simultaneously reducing the oxygen lance to 210-230 cm, staying for 0.5-1.5 min, then quickly lifting to 290-310 cm, staying for 0.5-1.5 min, and repeating the low-high lance position operation for 1-3 times;
5) And (3) in the later stage of blowing: slowly lowering the lance in a time period after 10min to ensure stable slag, lifting the oxygen lance to 300-330 cm during the sublance process test, and rapidly pulling carbon by lowering the lance after the test is finished, wherein the lance position is 180-200 cm, and the carbon pulling time is 1-3 min;
6) And (3) space operation: when the converter is empty, the converter is placed at a position of 0 degree, the oxygen lance is lowered to 180-200 cm, the oxygen lance is baked for more than 30min by using the waste heat of the converter, the lance is cooled for 3-7 min after reaching the upper limit, and the lance is lowered again for baking.
The oxygen lance in the step 1) has smooth and flat surfaces of the oxygen head and the lance body after the oxygen lance is assembled.
The total weight percentage of CaO and MgO in the lime powder in the step 1) is more than or equal to 80 percent, and the particle diameter of the lime powder is less than 1mm.
When the converter in the step 6) is placed at the position of 0 degrees, the oxygen lance is in a non-production state, and the non-production state is that the oxygen lance does not blow oxygen or nitrogen and only can lift or drop the lance.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, through the new methods of raw material preparation, smelting process control, empty furnace time operation and the like, equipment transformation is not performed, furnace body refractory materials are not damaged, the effect of reducing slag sticking on the surface of the oxygen lance is achieved, and the labor intensity of workers for digging slag or cutting oxygen lance slag is reduced.
Detailed Description
The present invention will be described in detail below, but it should be noted that the practice of the present invention is not limited to the following embodiments.
A method for reducing slag sticking of an oxygen lance in converter smelting comprises the following steps:
1) Oxygen lance preparation: the assembled oxygen lance ensures that the surfaces of the oxygen head and the lance body are smooth and even, white ash powder is smeared on the surface of the oxygen lance nozzle after the oxygen lance is on line, more than 95% of the surface of the lance head is smeared, and a certain lubricating effect of the surface of the lance head is ensured. Wherein the total weight percentage of CaO and MgO in the lime powder is more than or equal to 80 percent, and the particle diameter of the lime powder is less than 1mm.
2) Raw material preparation: in order to ensure good slag melting, the molten iron is smelted with Si content more than or equal to 0.4%; reducing the addition amount of converter scrap steel, and preferentially adding scrap steel varieties such as slag steel and the like which are favorable for slag melting, wherein the scrap steel ratio is less than 10 percent, and the scrap steel ratio is =scrap steel weight/(scrap steel weight+molten iron weight);
3) Smelting early stage: in a period of 0-5 min, in order to avoid sticking of the gun after the low slag temperature is low in the early stage, after the blowing and the firing are started, the gun position is kept at 250-290 cm, the first flux is added within 2min, 2/3 of the total amount of iron ore is added, the residual iron ore is added when the return drying occurs in the middle stage of smelting, and the slag is actively cooled by using non-accelerating slag melting cold materials;
4) Mid-converting: in the period of 5-10 min, in order to ensure good slag melting, the residual iron ore in the earlier stage of smelting is added in an amount of 1-3 kg/ton of molten steel each time, simultaneously, the lance is lifted to 280-300 cm until the uppermost edge of a furnace mouth is visible with foam slag, then the ore is stopped to be added, simultaneously, an oxygen lance is lowered to 210-230 cm and stays for 0.5-1.5 min, then is lifted to 290-310 cm quickly and stays for 0.5-1.5 min, the operation of the low-high lance position is repeated for 1-3 times, and the melting and separation of the molten slag of the oxygen lance are realized by repeatedly flushing high Wen Huoyue steel slag;
5) And (3) in the later stage of blowing: and in the time period after 10min, slowly lowering the lance to ensure stable slag, lifting the oxygen lance to 300 cm-330 cm during the test of the sublance process, rapidly pulling carbon by lowering the lance after the test is finished, and taking the carbon for 1-3 min at the lance position of 180 cm-200 cm, so that the high-temperature characteristic of the end point of the converter is fully utilized, and the slag on the surface of the oxygen lance is continuously melted and damaged.
And (3) space operation: when the converter is empty, the converter is placed at a position of 0 DEG, the oxygen lance is selected to be in a non-production state (oxygen or nitrogen is not blown, only the lance can be lifted or lowered), the oxygen lance is lowered to 180-200 cm, the oxygen lance is baked by using the waste heat of the converter for more than 30min, the oxygen lance is cooled for 3-7 min after being lifted to the upper limit, the lance is lowered again for baking, and the oxygen lance on the surface of the oxygen lance is easily swelled and cracked by cooling after long-time hot baking.
Examples
Taking 260t converter as an example:
(1) Oxygen lance preparation: the assembled oxygen lance ensures that the surfaces of the oxygen head and the lance body are smooth, lime powder (the content of the lime powder (CaO+MgO) is more than or equal to 80 percent, the particle diameter is less than 1 mm) is smeared on the surface of the oxygen lance nozzle after the oxygen lance is on line, and 98 percent of the surface of the lance head is smeared.
(2) Raw material preparation: the molten iron is smelted by selecting Si content of 0.45%; molten iron 260t and scrap steel 10 t.
(3) In the early stage of smelting, in a period of 0-5 min, in order to avoid sticking of the gun after low slag adhesion of the slag temperature in the early stage, after the gun position is 270cm after blowing and firing, the addition of the first 5t of active lime is completed within 1min, the total addition amount of iron ore is 6t, and the rest iron ore is added in the middle stage of smelting.
(4) In the middle of converting, the temperature of a molten pool is increased in a time period of 5-10 min, in order to ensure good slag melting, 500kg of iron ore is added each time, a lance is lifted to 290cm simultaneously, after foam slag is visible at the uppermost edge of a furnace mouth, an oxygen lance is lowered to 220cm and stays for 1min, then the oxygen lance is lifted to 300cm rapidly and stays for 1min, and the lance position operation is repeated for 3 times.
(5) In the later stage of blowing, the lance is slowly lowered in a period of 10min, so that the slag is stable, when the sublance process is tested, the oxygen lance is lifted to 310cm, after the test is finished, the lance is quickly lowered to pull carbon, the lance position is 190cm, the carbon pulling time is 2min, the high-temperature characteristic of the end point of the converter is fully utilized, and the slag on the surface of the oxygen lance is continuously melted and damaged.
(6) And (3) space operation: when the converter is empty, the converter is placed at a position of 0 DEG, the oxygen lance is selected to be in a non-production state, the oxygen lance is lowered to 190cm, the oxygen lance is baked for 30min by using the waste heat of the converter, the lance is cooled for 5min after reaching the upper limit, the lance is lowered again for baking, and the operation is repeated for 2 times.
Claims (3)
1. A method for reducing slag sticking of an oxygen lance in converter smelting, which is characterized by comprising the following steps:
1) Oxygen lance preparation: coating lime powder on the surface of the oxygen lance tip after threading, and coating the lime powder on the surface of more than 95% of the area of the lance tip; the total weight percentage of CaO and MgO in the lime powder is more than or equal to 80 percent, and the particle diameter of the lime powder is less than 1mm;
2) Raw material preparation: si content in molten iron is more than or equal to 0.4%; scrap ratio <10%, scrap ratio = scrap weight/(scrap weight + molten iron weight);
3) Smelting early stage: after the blowing and the firing are carried out for 0 to 5min, the gun position is kept at 250 to 290cm, the first batch of flux is added within 2min, the total amount of the added iron ore is 2/3, and the rest iron ore is added when the back drying occurs in the middle smelting stage;
4) Mid-converting: in the time period of 5-10 min, adding 1-3 kg/ton of molten steel into iron ore each time, adding the molten steel while lifting the lance to 280-300 cm, stopping adding the ore after foam slag is visible at the uppermost edge of a furnace mouth, simultaneously reducing the oxygen lance to 210-230 cm, staying for 0.5-1.5 min, then quickly lifting to 290-310 cm, staying for 0.5-1.5 min, and repeating the low-high lance position operation for 1-3 times;
5) And (3) in the later stage of blowing: slowly lowering the lance in a time period after 10min to ensure stable slag, lifting the oxygen lance to 300-330 cm during the sublance process test, and rapidly pulling carbon by lowering the lance after the test is finished, wherein the lance position is 180-200 cm, and the carbon pulling time is 1-3 min;
6) And (3) space operation: when the converter is empty, the converter is placed at a position of 0 degree, the oxygen lance is lowered to 180-200 cm, the oxygen lance is baked for more than 30min by using the waste heat of the converter, the lance is cooled for 3-7 min after reaching the upper limit, and the lance is lowered again for baking.
2. The method for reducing slag adhesion of an oxygen lance in converter smelting according to claim 1, wherein the oxygen lance in the step 1) has smooth and smooth surfaces of an oxygen head and a lance body after the oxygen lance is assembled.
3. The method for reducing slag sticking of an oxygen lance in converter smelting according to claim 1, wherein the oxygen lance is in a non-production state when the converter in the step 6) is placed at a position of 0 degrees, and the non-production state is that the oxygen lance does not blow oxygen or nitrogen and only can lift or lower the lance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210904838.8A CN115323100B (en) | 2022-07-29 | 2022-07-29 | Method for reducing slag sticking of oxygen lance in converter smelting |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210904838.8A CN115323100B (en) | 2022-07-29 | 2022-07-29 | Method for reducing slag sticking of oxygen lance in converter smelting |
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| CN115323100A CN115323100A (en) | 2022-11-11 |
| CN115323100B true CN115323100B (en) | 2023-07-14 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20040017141A (en) * | 2002-08-20 | 2004-02-26 | 주식회사 포스코 | Method for Manufacturing Molten Steel by Converter Refining Process |
| 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 |
| CN107779540A (en) * | 2016-08-31 | 2018-03-09 | 鞍钢股份有限公司 | A kind of converter list slag melting method of high-silicon molten iron |
| CN110724784A (en) * | 2019-10-14 | 2020-01-24 | 盐城市联鑫钢铁有限公司 | Low-silicon high-phosphorus molten iron converter smelting method |
-
2022
- 2022-07-29 CN CN202210904838.8A patent/CN115323100B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20040017141A (en) * | 2002-08-20 | 2004-02-26 | 주식회사 포스코 | Method for Manufacturing Molten Steel by Converter Refining Process |
| 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 |
| CN107779540A (en) * | 2016-08-31 | 2018-03-09 | 鞍钢股份有限公司 | A kind of converter list slag melting method of high-silicon molten iron |
| CN110724784A (en) * | 2019-10-14 | 2020-01-24 | 盐城市联鑫钢铁有限公司 | Low-silicon high-phosphorus molten iron converter smelting method |
Non-Patent Citations (1)
| Title |
|---|
| 转炉氧枪粘钢原因分析与预防措施;孟磊;肖卫军;耿恒亮;田勇;史万顺;;武钢技术(02);19-21 * |
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