CN104928432A - Method for removing phosphorus in converter through blowing nitrogen - Google Patents
Method for removing phosphorus in converter through blowing nitrogen Download PDFInfo
- Publication number
- CN104928432A CN104928432A CN201510318622.3A CN201510318622A CN104928432A CN 104928432 A CN104928432 A CN 104928432A CN 201510318622 A CN201510318622 A CN 201510318622A CN 104928432 A CN104928432 A CN 104928432A
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- molten steel
- nitrogen
- converter
- nitrogen flushing
- dephosphorization
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- Carbon Steel Or Casting Steel Manufacturing (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The invention discloses a method for removing phosphorus in a converter through blowing nitrogen. The method comprises the following steps: (1), when the first-pouring temperature is larger than 1660 DEG C, first-pouring molten steel contains 0.030-0.060% of phosphorus, and meanwhile, the liquidity of furnace slag is good, oxygen blowing by an oxygen gun is changed into nitrogen blowing and nitrogen flow is controlled to be 11500-12500 m<3>/h; (2), the oxygen gun is dropped to a converting low gun position; (3), the oxygen gun is opened for 20-40 s, so as to enable the oxygen gun to remove phosphorus from the smelting molten steel in the converter through blowing nitrogen. The method has the advantages that average temperature drop can reach 1 DEG C per second, the average phosphorus removal ratio is 0.015%, the phosphorus removal effect is good and the peroxidating phenomenon of molten steel does not occur in a phosphorus removal process.
Description
Technical field
The present invention relates to the nitrogen flushing dephosphorization method of smelting molten steel in Converter.
Background technology
The stove (being called for short " one falls ") that falls for the first time is a pause in converter steelmaking process, one object of falling is to understand the process situation of smelting in now converter, as liquid steel temperature (liquid steel temperature detected referred to as one fall temperature), molten steel composition (one detects the content of phosphorus in the molten steel that obtains referred to as a phosphorus content of falling molten steel), change slag situation etc., to determine to control tapping molten steel condition accurately.Converter current liquid steel dephosphorization generally adopts the method such as oxygen blast, slag making by phosphorus ligands, in manually operated converter operation, when a phosphorus content of falling molten steel is greater than 0.030%, oxygen is re-blow, slag making carrys out further dephosphorization to need continuation to open smelting molten steel, but aforesaid method also can make molten steel peroxidation because of decarburization in the process of dephosphorization, because Molten Steel over-oxidation is safeguarded and the raising of billet quality not only bad for the working of a furnace, nor be beneficial to the reduction of smelting cost.
Summary of the invention
The object of this invention is to provide the effective and nitrogen flushing dephosphorization method in the Converter that Molten Steel over-oxidation phenomenon can not occur in dephosphorization process of a kind of dephosphorization.
For achieving the above object, present invention employs following technical scheme: nitrogen flushing dephosphorization method in described Converter, comprises the following steps:
(1) when one falls temperature and is greater than 1660 DEG C, and a phosphorus content of falling molten steel is 0.030 ~ 0.060%, when slag fluidity is good simultaneously, changes oxygen gun blowing into nitrogen flushing, and controls at 11500 ~ 12500m3/h by nitrogen flow;
(2) then oxygen rifle is dropped to the low rifle position of blowing;
(3) then open oxygen rifle 20 ~ 40s, make oxygen rifle carry out nitrogen flushing dephosphorization to smelting molten steel in Converter.
Further, nitrogen flushing dephosphorization method in aforesaid Converter, wherein: when one, to fall temperature be 1660 ~ 1680 DEG C, and a phosphorus content of falling molten steel is 0.030 ~ 0.060%, when slag fluidity is good simultaneously, changes oxygen gun blowing into nitrogen flushing, and controls nitrogen flow at 12000m
3/ h.
Further, nitrogen flushing dephosphorization method in aforesaid Converter, wherein: when one, to fall temperature be 1670 DEG C, and a phosphorus content of falling molten steel is 0.030 ~ 0.060%, when slag fluidity is good simultaneously, changes oxygen gun blowing into nitrogen flushing, and controls nitrogen flow at 12000m
3/ h.
Further, nitrogen flushing dephosphorization method in aforesaid Converter, wherein: when one falls temperature and is greater than 1660 DEG C, and a phosphorus content of falling molten steel is 0.045%, when slag fluidity is good simultaneously, changes oxygen gun blowing into nitrogen flushing, and controls nitrogen flow at 12000m
3/ h.
Further, nitrogen flushing dephosphorization method in aforesaid Converter, wherein: when one, to fall temperature be 1660 ~ 1680 DEG C, and a phosphorus content of falling molten steel is 0.045%, when slag fluidity is good simultaneously, changes oxygen gun blowing into nitrogen flushing, and controls nitrogen flow at 12000m
3/ h.
Further, nitrogen flushing dephosphorization method in aforesaid Converter, wherein: when one, to fall temperature be 1670 DEG C, and a phosphorus content of falling molten steel is 0.045%, when slag fluidity is good simultaneously, changes oxygen gun blowing into nitrogen flushing, and controls nitrogen flow at 12000m
3/ h.
Further, nitrogen flushing dephosphorization method in aforesaid Converter, wherein: open oxygen rifle 30s, makes oxygen rifle carry out nitrogen flushing dephosphorization to smelting molten steel in Converter.
By the enforcement of technique scheme, the invention has the beneficial effects as follows: average temperature drop can reach 1 DEG C/sec, average dephosphorization 0.015%, dephosphorization is effective and in dephosphorization process, Molten Steel over-oxidation phenomenon can not occur.
Embodiment
Below in conjunction with specific embodiment, the invention will be further described.
Embodiment one
Nitrogen flushing dephosphorization method in Converter, comprises the following steps:
(1) to fall temperature be 1660 DEG C when one, and a phosphorus content of falling molten steel is 0.030%, when slag fluidity is good simultaneously, changes oxygen gun blowing into nitrogen flushing, and controls nitrogen flow at 11500m
3/ h;
(2) then oxygen rifle is dropped to the low rifle position of blowing;
(3) then open oxygen rifle 20s, make oxygen rifle carry out nitrogen flushing dephosphorization to smelting molten steel in Converter.
Embodiment two
Nitrogen flushing dephosphorization method in Converter, comprises the following steps:
(1) to fall temperature be 1670 DEG C when one, and a phosphorus content of falling molten steel is 0.045%, when slag fluidity is good simultaneously, changes oxygen gun blowing into nitrogen flushing, and controls nitrogen flow at 12000m
3/ h;
(2) then oxygen rifle is dropped to the low rifle position of blowing;
(3) then open oxygen rifle 30s, make oxygen rifle carry out nitrogen flushing dephosphorization to smelting molten steel in Converter.
Embodiment three
Nitrogen flushing dephosphorization method in Converter, comprises the following steps:
(1) to fall temperature be 1680 DEG C when one, and a phosphorus content of falling molten steel is 0.060%, when slag fluidity is good simultaneously, changes oxygen gun blowing into nitrogen flushing, and controls nitrogen flow at 12500m
3/ h;
(2) then oxygen rifle is dropped to the low rifle position of blowing;
(3) then open oxygen rifle 40s, make oxygen rifle carry out nitrogen flushing dephosphorization to smelting molten steel in Converter.
Embodiment four
Nitrogen flushing dephosphorization method in Converter, comprises the following steps:
(1) to fall temperature be 1700 DEG C when one, and a phosphorus content of falling molten steel is 0.045%, when slag fluidity is good simultaneously, changes oxygen gun blowing into nitrogen flushing, and controls nitrogen flow at 12000m
3/ h;
(2) then oxygen rifle is dropped to the low rifle position of blowing;
(3) then open oxygen rifle 30s, make oxygen rifle carry out nitrogen flushing dephosphorization to smelting molten steel in Converter.
Advantage of the present invention is: average temperature drop can reach 1 DEG C/sec, average dephosphorization 0.015%, and dephosphorization is effective and in dephosphorization process, Molten Steel over-oxidation phenomenon can not occur.
Claims (7)
1. nitrogen flushing dephosphorization method in Converter, is characterized in that: comprise the following steps:
(1) when one falls temperature and is greater than 1660 DEG C, and a phosphorus content of falling molten steel is 0.030 ~ 0.060%, when slag fluidity is good simultaneously, changes oxygen gun blowing into nitrogen flushing, and controls nitrogen flow at 11500 ~ 12500m
3/ h;
(2) then oxygen rifle is dropped to the low rifle position of blowing;
(3) then open oxygen rifle 20 ~ 40s, make oxygen rifle carry out nitrogen flushing dephosphorization to smelting molten steel in Converter.
2. nitrogen flushing dephosphorization method in Converter according to claim 1, it is characterized in that: when one, to fall temperature be 1660 ~ 1680 DEG C, and a phosphorus content of falling molten steel is 0.030 ~ 0.060%, when slag fluidity is good simultaneously, change oxygen gun blowing into nitrogen flushing, and nitrogen flow is controlled at 12000m
3/ h.
3. nitrogen flushing dephosphorization method in Converter according to claim 2, it is characterized in that: when one, to fall temperature be 1670 DEG C, and a phosphorus content of falling molten steel is 0.030 ~ 0.060%, when slag fluidity is good simultaneously, change oxygen gun blowing into nitrogen flushing, and nitrogen flow is controlled at 12000m
3/ h.
4. nitrogen flushing dephosphorization method in Converter according to claim 1, it is characterized in that: when one falls temperature and is greater than 1660 DEG C, and a phosphorus content of falling molten steel is 0.045%, when slag fluidity is good simultaneously, change oxygen gun blowing into nitrogen flushing, and nitrogen flow is controlled at 12000m
3/ h.
5. nitrogen flushing dephosphorization method in Converter according to claim 4, it is characterized in that: when one, to fall temperature be 1660 ~ 1680 DEG C, and a phosphorus content of falling molten steel is 0.045%, when slag fluidity is good simultaneously, change oxygen gun blowing into nitrogen flushing, and nitrogen flow is controlled at 12000m
3/ h.
6. nitrogen flushing dephosphorization method in Converter according to claim 5, is characterized in that: when one, to fall temperature be 1670 DEG C, and a phosphorus content of falling molten steel is 0.045%, when slag fluidity is good simultaneously, changes oxygen gun blowing into nitrogen flushing, and controls nitrogen flow at 12000m
3/ h.
7. according to nitrogen flushing dephosphorization method in Converter according to claim 1, it is characterized in that: open oxygen rifle 30s, make oxygen rifle carry out nitrogen flushing dephosphorization to smelting molten steel in Converter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510318622.3A CN104928432A (en) | 2015-06-11 | 2015-06-11 | Method for removing phosphorus in converter through blowing nitrogen |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510318622.3A CN104928432A (en) | 2015-06-11 | 2015-06-11 | Method for removing phosphorus in converter through blowing nitrogen |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104928432A true CN104928432A (en) | 2015-09-23 |
Family
ID=54115854
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510318622.3A Pending CN104928432A (en) | 2015-06-11 | 2015-06-11 | Method for removing phosphorus in converter through blowing nitrogen |
Country Status (1)
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110218841A (en) * | 2019-06-27 | 2019-09-10 | 武汉钢铁有限公司 | A kind of method of producing ultra-low phosphorous steel by converter |
| CN112342340A (en) * | 2020-10-14 | 2021-02-09 | 石横特钢集团有限公司 | Nitrogen supplementary blowing dephosphorization process for converter |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2057509A (en) * | 1979-08-30 | 1981-04-01 | Boc Ltd | Steel making in top-blown converter |
| CN1552919A (en) * | 2003-05-29 | 2004-12-08 | 宝山钢铁股份有限公司 | Converter oxide and nitrogen top-blown dephosphorizing method |
| CN102220448A (en) * | 2011-06-02 | 2011-10-19 | 首钢总公司 | Method for smelting uniform end-point molten steel composition with converter |
| CN103160637A (en) * | 2013-02-26 | 2013-06-19 | 首钢总公司 | Low-phosphorous steel smelting method of mixed blowing of oxygen and nitrogen of top blowing oxygen lance of converter |
| CN103773919A (en) * | 2014-02-18 | 2014-05-07 | 钢铁研究总院 | Method for smelting middle-high phosphorus molten iron in converter |
| CN104451022A (en) * | 2014-12-19 | 2015-03-25 | 山东钢铁股份有限公司 | Method for reducing content of total iron in final slag of dephosphorization furnace |
| CN104480246A (en) * | 2014-12-02 | 2015-04-01 | 天津钢铁集团有限公司 | Slag control method of dephosphorization foaming slag in converter double-slag-process steel making |
-
2015
- 2015-06-11 CN CN201510318622.3A patent/CN104928432A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2057509A (en) * | 1979-08-30 | 1981-04-01 | Boc Ltd | Steel making in top-blown converter |
| CN1552919A (en) * | 2003-05-29 | 2004-12-08 | 宝山钢铁股份有限公司 | Converter oxide and nitrogen top-blown dephosphorizing method |
| CN102220448A (en) * | 2011-06-02 | 2011-10-19 | 首钢总公司 | Method for smelting uniform end-point molten steel composition with converter |
| CN103160637A (en) * | 2013-02-26 | 2013-06-19 | 首钢总公司 | Low-phosphorous steel smelting method of mixed blowing of oxygen and nitrogen of top blowing oxygen lance of converter |
| CN103773919A (en) * | 2014-02-18 | 2014-05-07 | 钢铁研究总院 | Method for smelting middle-high phosphorus molten iron in converter |
| CN104480246A (en) * | 2014-12-02 | 2015-04-01 | 天津钢铁集团有限公司 | Slag control method of dephosphorization foaming slag in converter double-slag-process steel making |
| CN104451022A (en) * | 2014-12-19 | 2015-03-25 | 山东钢铁股份有限公司 | Method for reducing content of total iron in final slag of dephosphorization furnace |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110218841A (en) * | 2019-06-27 | 2019-09-10 | 武汉钢铁有限公司 | A kind of method of producing ultra-low phosphorous steel by converter |
| CN112342340A (en) * | 2020-10-14 | 2021-02-09 | 石横特钢集团有限公司 | Nitrogen supplementary blowing dephosphorization process for converter |
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Application publication date: 20150923 |