CN103255264A - Method for removing phosphorus by utilizing LF (Ladle Furnace) - Google Patents
Method for removing phosphorus by utilizing LF (Ladle Furnace) Download PDFInfo
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- CN103255264A CN103255264A CN2013102273649A CN201310227364A CN103255264A CN 103255264 A CN103255264 A CN 103255264A CN 2013102273649 A CN2013102273649 A CN 2013102273649A CN 201310227364 A CN201310227364 A CN 201310227364A CN 103255264 A CN103255264 A CN 103255264A
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Abstract
The invention relates to the field of the secondary refining of an LF (Ladle Furnace), and in particular relates to a method for removing phosphorus by utilizing LF. The method is characterized in that the content of oxygen entering a station and the adding amount of lime particles and refining slags are controlled by utilizing the oxidability of molten steel, so that the temperature of the molten steel entering the station is decreased so as to meet a low-temperature condition required for removing the phosphorus. Compared with the prior art, the method has the beneficial effects that 1) by utilizing the characteristic of the high oxidability of the molten steel, the lime particles are added so as to provide the high alkalinity required for removing the phosphorus; and the slags of 1ton or so are added so as to meet the large slag quantity required for removing the phosphorus, wherein the temperature of the molten steel entering the station is normally from 1600 to 1620 DEG C, thereby meeting the low-temperature condition required for removing the phosphorus; and 2) when the content of the phosphorus in an argon station is between 0.010% and 0.015%, the phosphorus removal is performed in a one-step feeding manner, wherein the phosphorus removal rate can reach 40% to 45%; and the content of the phosphorus in the argon station is greater than 0.015%, the phosphorus removal rate can reach 46% to 51% by performing the phosphorus removal in a secondary feeding manner, so that the content of a finished phosphorus product is controlled within 0.010%. As a result, the quality risk is avoided.
Description
Technical field
The present invention relates to LF refining furnace secondary refining field, relate in particular to a kind of method of the LF of utilization refining furnace dephosphorization.
Background technology
Steelworks is produced the IF steel and is generally adopted hot metal pretreatment-converter-vacuum-continuous casting process, produces by " IF steel Operating Guideline ".But some steel grades are arranged, for example require phosphorus content less than 0.010% in the M3A33 steel grade, converter is because molten iron phosphorus is high or the change slag is bad, argon station phosphorus is often greater than 0.010%, and vacuum oven does not possess dephosphorizing capacity, and quality product can't be guaranteed, if phosphorus content exceed standard can only steel grade degradation or change steel.
Summary of the invention
The method that the purpose of this invention is to provide a kind of LF of utilization refining furnace dephosphorization is avoided because the phosphorus height causes the steel grade degradation or changes steel, and the control quality risk guarantees quality product.
For achieving the above object, technical scheme of the present invention is:
A kind of method of utilizing LF refining furnace dephosphorization, the enter the station add-on of oxygen level and lime grain and refining slag of the oxidisability of utilizing molten steel itself to have, control reduces the molten steel inlet temperature and satisfies the required cold condition of dephosphorization, when argon station phosphorus greater than 0.015% the time, its concrete operations step is as follows:
1) control the molten steel oxygen level 500～700ppm that enters the station, liquid steel temperature is 1600～1620 ℃, adds 3.2 ~ 3.5kg/t steel lime grain in the first batch, 0.8 ~ 1.0kg/t steel refining slag and 0.12 ~ 0.15kg/t steel fluorite;
2) argon blowing rate is adjusted into 20 ~ 25Nm
3/ h is controlled to be 4 ~ 4.5 ℃/minute with the electrode temperature rise rate, and by taking out of the temperature control heating-up time, heating-up time and inlet temperature relation see Table 1 according to inlet temperature;
Table 1
| Inlet temperature (℃) | <1600 | 1600～1610 | 1610～1620 | 1620～1630 | >1630 |
| Heating-up time (min) | 10 | 8 | 7 | 6 | 4 |
3) begin to carry out the secondary charging dephosphorization in 3 ~ 4 minutes in intensification, add lime grain 2 ~ 2.2kg/t steel;
4) after intensification finished, the adjustment argon blowing rate was 95 ~ 100Nm
3/ h stirs 3 ~ 5min, thermometric, and when temperature during greater than 1630 ℃, sampling is taken out of; When temperature during less than 1630 ℃, carry out secondary temperature elevation for 1640 ℃ by taking out of temperature, 4 ~ 5 ℃/minute of temperature rise rates, after secondary temperature elevation finished, argon blowing rate was adjusted into 95 ~ 100Nm
3/ h stirs 3 ~ 5min, and sampling is taken out of.
When argon station phosphorus was between 0.010 ~ 0.015%, its concrete operations step was as follows:
1) control the molten steel oxygen level 500～700ppm that enters the station, liquid steel temperature is 1600～1620 ℃, adds 3.6 ~ 3.8kg/t steel lime grain, 0.8 ~ 1.0kg/t steel refining slag and 0.12 ~ 0.15kg/t steel fluorite;
2) argon blowing rate is adjusted into 20 ~ 25Nm
3/ h is controlled to be 4 ~ 4.5 ℃/minute with the electrode temperature rise rate, and by taking out of the temperature control heating-up time, heating-up time and inlet temperature relation see Table 2 according to inlet temperature;
Table 2
| Inlet temperature (℃) | <1600 | 1600～1610 | 1610～1620 | 1620～1630 | >1630 |
| Heating-up time (min) | 10 | 9 | 8 | 7 | 5 |
3) after intensification finished, the adjustment argon blowing rate was 95 ~ 100Nm
3/ h stirs 3 ~ 5min, thermometric, and when temperature during greater than 1630 ℃, sampling is taken out of; When temperature during less than 1630 ℃, carry out secondary temperature elevation for 1640 ℃ by taking out of temperature, 4 ~ 5 ℃/minute of temperature rise rates, after secondary temperature elevation finished, argon blowing rate was adjusted into 95 ~ 100Nm
3/ h stirs 3 ~ 5min, and sampling is taken out of.
The composition of described refining slag is by weight percentage: Al
2O
335 ~ 46%, SiO
2≤ 8%, S≤0.05%, Fe
2O
3≤ 1.5%, MgO≤6%, CaO 〉=35%, CaF
2≤ 5%, H
2O≤0.5%, 1300 ~ 1400 ℃ of fusing points.
Compared with prior art, the invention has the beneficial effects as follows: the hyperoxia voltinism characteristics of 1) utilizing molten steel itself, adding the lime grain provides dephosphorization required high basicity, the quantity of slag that adds about 1 ton, satisfied the required big quantity of slag of dephosphorization, the molten steel inlet temperature is generally 1600～1620 ℃, has satisfied the required cold condition of dephosphorization.2) when argon station phosphorus is between 0.010 ~ 0.015%, adopt once reinforced dephosphorization, dephosphorization rate reaches 40～45%; Argon station phosphorus was greater than 0.015% o'clock, and by the secondary charging dephosphorization, dephosphorization rate 46～51% makes the control of finished product phosphorus in 0.010%, has stopped quality risk fully.
Embodiment
The invention will be further described below in conjunction with specific embodiment:
Embodiment 1
Be example with steel grade M3A33,250 tons of LF refining furnace heat sizes, steel grade requires P≤0.010%, if argon station phosphorus is 0.014% to exceed the steel grade requirement, then molten steel is moved to the LF stove, advance 1610 ℃ of LF stove thermometrics, add 900kg lime granule, 250kg refining slag and 30kg fluorite are adjusted into 25Nm with argon blowing rate
3/ h is made as 4 ℃/minute with the electrode temperature rise rate, is that the concrete heating-up time value of 9min(is chosen by table 2 according to inlet temperature by taking out of 1635 ℃ of control heating-up times of temperature), heat up after the end, argon blowing rate is adjusted into 95Nm
3/ h stirs 3min, thermometric, and temperature is greater than 1630 ℃, and sampling is taken out of.
Embodiment 2
Be example with steel grade CSC, 250 tons of LF refining furnace heat sizes, steel grade requires P≤0.010%, if argon station phosphorus 0.016% exceeds the steel grade requirement, then molten steel is moved to the LF stove, advance 1620 ℃ of LF stove thermometrics, add 825kg lime granule, 225kg refining slag and 37.5kg fluorite are adjusted into 20Nm with argon blowing rate
3/ h is made as 4.5 ℃/minute with the electrode temperature rise rate, is that the concrete heating-up time value of 7min(is chosen by table 1 according to inlet temperature by taking out of 1635 ℃ of control heating-up times of temperature), heat up after the end, argon blowing rate is adjusted into 95Nm
3/ h stirs 3min, thermometric, and temperature is greater than 1630 ℃, and sampling is taken out of.
Embodiment 3
Be example with steel grade M3A33,250 tons of LF refining furnace heat sizes, steel grade requires P≤0.010%, if argon station phosphorus 0.018% exceeds the steel grade requirement, then molten steel is moved to the LF stove, advance 1610 ℃ of LF stove thermometrics, add 800kg lime granule, 200kg refining slag and 35kg fluorite are adjusted into 25Nm with argon blowing rate
3/ h is made as 4 ℃/minute with the electrode temperature rise rate, is that the concrete heating-up time value of 8min(is chosen by table 1 according to inlet temperature by taking out of 1635 ℃ of control heating-up times of temperature), heat up after the end, argon blowing rate is adjusted into 100Nm
3/ h stirs 5min, thermometric, and temperature is then controlled the secondary temperature elevation times for 1640 ℃ by taking out of temperature less than 1630 ℃, 5 ℃/minute of temperature rise rates, after secondary temperature elevation finished, argon blowing rate was adjusted into 100Nm
3/ h stirs 5min, and sampling is taken out of.
In above-described embodiment, the composition of refining slag is by weight percentage: Al
2O
335 ~ 46%, SiO
2≤ 8%, S≤0.05%, Fe
2O
3≤ 1.5%, MgO≤6%, CaO 〉=35%, CaF
2≤ 5%, H
2O≤0.5%, 1300 ~ 1400 ℃ of fusing points.
Claims (3)
1. method of utilizing LF refining furnace dephosphorization, it is characterized in that, the oxidisability of utilizing molten steel itself to have, control the add-on of enter the station oxygen level and lime grain and refining slag, reduce the molten steel inlet temperature and satisfy the required cold condition of dephosphorization, when argon station phosphorus greater than 0.015% the time, its concrete operations step is as follows:
1) control the molten steel oxygen level 500～700ppm that enters the station, liquid steel temperature is 1600～1620 ℃, adds 3.2 ~ 3.5kg/t steel lime grain in the first batch, 0.8 ~ 1.0kg/t steel refining slag and 0.12 ~ 0.15kg/t steel fluorite;
2) argon blowing rate is adjusted into 20 ~ 25Nm
3/ h is controlled to be 4 ~ 4.5 ℃/minute with the electrode temperature rise rate, and by taking out of the temperature control heating-up time, heating-up time and inlet temperature relation see Table 1 according to inlet temperature;
Table 1
3) begin to carry out the secondary charging dephosphorization in 3 ~ 4 minutes in intensification, add lime grain 2 ~ 2.2kg/t steel;
4) after intensification finished, the adjustment argon blowing rate was 95 ~ 100Nm
3/ h stirs 3 ~ 5min, thermometric, and when temperature during greater than 1630 ℃, sampling is taken out of; When temperature during less than 1630 ℃, carry out secondary temperature elevation for 1640 ℃ by taking out of temperature, 4 ~ 5 ℃/minute of temperature rise rates, after secondary temperature elevation finished, argon blowing rate was adjusted into 95 ~ 100Nm
3/ h stirs 3 ~ 5min, and sampling is taken out of.
2. method of utilizing LF refining furnace dephosphorization, it is characterized in that, the oxidisability of utilizing molten steel itself to have, control the add-on of enter the station oxygen level and lime grain and refining slag, reduce the molten steel inlet temperature and satisfy the required cold condition of dephosphorization, when argon station phosphorus was between 0.010 ~ 0.015%, its concrete operations step was as follows:
1) control the molten steel oxygen level 500～700ppm that enters the station, liquid steel temperature is 1600～1620 ℃, adds 3.6 ~ 3.8kg/t steel lime grain, 0.8 ~ 1.0kg/t steel refining slag and 0.12 ~ 0.15kg/t steel fluorite;
2) argon blowing rate is adjusted into 20 ~ 25Nm
3/ h is controlled to be 4 ~ 4.5 ℃/minute with the electrode temperature rise rate, and by taking out of the temperature control heating-up time, heating-up time and inlet temperature relation see Table 2 according to inlet temperature;
Table 2
3) after intensification finished, the adjustment argon blowing rate was 95 ~ 100Nm
3/ h stirs 3 ~ 5min, thermometric, and when temperature during greater than 1630 ℃, sampling is taken out of; When temperature during less than 1630 ℃, carry out secondary temperature elevation for 1640 ℃ by taking out of temperature, 4 ~ 5 ℃/minute of temperature rise rates, after secondary temperature elevation finished, argon blowing rate was adjusted into 95 ~ 100Nm
3/ h stirs 3 ~ 5min, and sampling is taken out of.
3. a kind of method of utilizing LF refining furnace dephosphorization according to claim 1 and 2 is characterized in that the composition of described refining slag is by weight percentage: Al
2O
335 ~ 46%, SiO
2≤ 8%, S≤0.05%, Fe
2O
3≤ 1.5%, MgO≤6%, CaO 〉=35%, CaF
2≤ 5%, H
2O≤0.5%, 1300 ~ 1400 ℃ of fusing points.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105039647A (en) * | 2015-06-23 | 2015-11-11 | 武汉钢铁(集团)公司 | LF furnace shallow dephosphorization refining method |
| CN103468868B (en) * | 2013-08-29 | 2017-07-21 | 鞍钢股份有限公司 | A kind of method for improving low-phosphorous gap-free atom steel cleanness |
| CN107012293A (en) * | 2016-01-27 | 2017-08-04 | 鞍钢股份有限公司 | A kind of method that raising LF stoves heating efficiency reduces solvent consumption |
| CN113832295A (en) * | 2021-09-17 | 2021-12-24 | 北京首钢股份有限公司 | Dephosphorization method for emergency remediation |
| CN115061522A (en) * | 2022-05-25 | 2022-09-16 | 广东韶钢松山股份有限公司 | LF temperature control method |
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| CN101319265A (en) * | 2008-07-17 | 2008-12-10 | 鞍钢股份有限公司 | Powder preparation additive for outside-stove refining dephosphorization, removing fine foreign matter and its manufacturing method |
| CN101979672A (en) * | 2010-09-29 | 2011-02-23 | 山西太钢不锈钢股份有限公司 | Method for ultra-deeply dephosphorizing in steel ladle |
| CN102296148A (en) * | 2010-06-25 | 2011-12-28 | 鞍钢股份有限公司 | Dephosphorization method in IF (Interstitial-Free) ladle |
| CN102399942A (en) * | 2010-09-16 | 2012-04-04 | 鞍钢股份有限公司 | Method of ultra-low-carbon steel dephosphorization outside furnace |
| CN102719615A (en) * | 2012-06-26 | 2012-10-10 | 山西太钢不锈钢股份有限公司 | Smelting method of steel for raw material pure iron |
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| CN101319265A (en) * | 2008-07-17 | 2008-12-10 | 鞍钢股份有限公司 | Powder preparation additive for outside-stove refining dephosphorization, removing fine foreign matter and its manufacturing method |
| CN102296148A (en) * | 2010-06-25 | 2011-12-28 | 鞍钢股份有限公司 | Dephosphorization method in IF (Interstitial-Free) ladle |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103468868B (en) * | 2013-08-29 | 2017-07-21 | 鞍钢股份有限公司 | A kind of method for improving low-phosphorous gap-free atom steel cleanness |
| CN105039647A (en) * | 2015-06-23 | 2015-11-11 | 武汉钢铁(集团)公司 | LF furnace shallow dephosphorization refining method |
| CN107012293A (en) * | 2016-01-27 | 2017-08-04 | 鞍钢股份有限公司 | A kind of method that raising LF stoves heating efficiency reduces solvent consumption |
| CN113832295A (en) * | 2021-09-17 | 2021-12-24 | 北京首钢股份有限公司 | Dephosphorization method for emergency remediation |
| CN115061522A (en) * | 2022-05-25 | 2022-09-16 | 广东韶钢松山股份有限公司 | LF temperature control method |
| CN115061522B (en) * | 2022-05-25 | 2024-04-02 | 广东韶钢松山股份有限公司 | LF temperature control method |
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