CN102312033A - Dephosphorization method of high-phosphorous chromium-nickel pig iron - Google Patents
Dephosphorization method of high-phosphorous chromium-nickel pig iron Download PDFInfo
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Abstract
The invention relates to a dephosphorization method of high-phosphorous chromium-nickel pig iron. The method comprises the following steps in order: I. EAF (electric arc furnace) preliminary desilication, adding the high-phosphorous chromium-nickel pig iron into an EAF for fusing so as to realize preliminary desilication, with silicon in the desiliconized molten iron up to 0.05-1.0% by weight; II. removing electric furnace slag and blending the molten iron into an AOD (argon oxygen decarburization) furnace or converter, with the molten iron at a temperature of 1400-1550DEG C; III. dephosphorization, adding 6-45kg/ton steel of lime and 1-34kg/ton steel of fluorite into the blended molten iron, leaving the alkalinity R being 1-5, blowing a mixed gas of oxygen and nitrogen that are in a ratio of 2:1-5:1, when the gas allocation amounts to 0.5-3Nm<3>/ton steel. min. and the content of molten steel P is less than or equal to 0.04%, removing oxidized slag, thus obtaining low-phosphorous molten iron. In another method, a ladle and molten iron dephosphorization pretreatment is conducted after removing electric furnace slag following EAF preliminary desilication in step I. The dephosphorization method of high-phosphorous chromium-nickel pig iron in the invention is characterized by low cost and short time. The dephosphorization process is shortened to 6-10min, thus enhancing the dephosphorization efficiency.
Description
Technical field
The present invention relates to a kind of method of high phosphorus chromium nickel pig iron dephosphorization, specifically is the method for the chromium nickel pig iron dephosphorization of phosphorus content 0.06%-0.12%.
Background technology
High phosphorus chromium nickel pig iron resource is wide, price is low, direct adapted when producing stainless steel, but the high phosphorus chromium nickel pig iron is siliceous, phosphorus and carbon are all high, has limited the consumption of the high phosphorus chromium nickel pig iron.
Existing dephosphorizing method is generally used the electric furnace dephosphorization under oxidizing atmosphere, and under the pattern that all cold charge is smelted, the temperature that the thawing pig iron needs is higher, and dephosphorization temperature requirement liquid steel temperature can not be too high, and the two conflicts mutually, and temperature control becomes the restrictive condition of dephosphorization; The oxygen utilization rate of while electric furnace, the cost of dephosphorization is high, consumption is high, the time is long.
Summary of the invention
For the deficiency that cost is high, the time is long that overcomes existing high phosphorus chromium nickel pig iron dephosphorizing method, the present invention provides the high phosphorus chromium nickel pig iron dephosphorizing method that a kind of cost is low, the time is short.
Design of the present invention is to be raw material with the high phosphorus chromium nickel pig iron (or the high phosphorus chromium nickel pig iron+other nickelalloy), through EAF (electric arc furnace) fusing desiliconization, and AOD (hydrogen-oxygen decarburization), converter, or liquid iron pretreatment dephosphorizing, smelting for the back operation provides low-phosphorous molten iron.
Adopt the method for dephosphorization under oxidizing atmosphere, select CaO+SiO for use
2+ CaF
2Slag system is as dephosphorizing agent.Dephosphorization is according to the conditional request of low temperature, the big quantity of slag and high basicity.
The method of this high phosphorus chromium nickel pig iron dephosphorization comprises following sequential steps:
The preliminary desiliconization of I EAF
The high phosphorus chromium nickel pig iron added in the electric arc furnace melts, preliminary desiliconization, after the desiliconization in the molten iron weight percentage of silicon be 0.05-1.0%;
II removes electric furnace slag and is blended into AOD stove (hydrogen-oxygen decarburization) or converter, and molten iron temperature is 1400-1550 ℃;
Because of electric steel grain slag amount is bigger, the main purpose of this step reduces the quantity of slag exactly, remove electric furnace slag after, high phosphorus hot metal is blended in AOD stove or the converter.
The III dephosphorization
In the molten iron that is blended into, add lime and fluorite, add-on is a lime 6-45kg/ ton steel, fluorite 1-34kg/ ton steel, basicity R is 1-5, is blown into oxygen, nitrogen mixture gas, the ratio of oxygen and nitrogen is 2: 1-5: 1, the distribution amount is 0.5-3Nm
3/ ton steel. divide, behind the content of molten steel P≤0.04%, remove the oxidation slag, promptly get low-phosphorous molten iron.
The method of this high phosphorus chromium nickel pig iron dephosphorization also can adopt following another kind of mode, and it comprises following sequential steps:
The preliminary desiliconization of I EAF
The high phosphorus chromium nickel pig iron added in the electric arc furnace melts, preliminary desiliconization, after the desiliconization in the molten iron weight percentage of silicon be 0.05-1.0%;
II carries out the ladle hot metal pretreatment after removing electric furnace slag
After removing the slag on electric furnace molten iron surface, beginning ladle hot metal pretreatment is taken off P, liquid steel temperature 1400-1550 ℃.
The III dephosphorization
In molten iron, add lime and fluorite, add-on is a lime 6-45kg/ ton steel, fluorite 1-34kg/ ton steel, basicity R is 1-5, is blown into oxygen, and oxidation C heats up, and the distribution amount is 0.5-5Nm
3/ ton steel. divide, behind the content of molten steel P≤0.04%, remove the oxidation slag, promptly get low-phosphorous molten iron.
The method cost of this high phosphorus chromium nickel pig iron dephosphorization is low, the time short, and dephosphorizing process shortened to the 6-10 branch by 20-30 minute of existing dephosphorizing method, had improved the efficient of dephosphorization.
Embodiment
Specify the embodiment of the method for this high phosphorus chromium nickel pig iron dephosphorization below in conjunction with embodiment, but the embodiment of the method for this high phosphorus chromium nickel pig iron dephosphorization is not limited to following embodiment.
Embodiment one
Present embodiment is a following sequential steps:
The preliminary desiliconization of I EAF
With composition is that the high phosphorus chromium nickel pig iron 75.2t of following weight per-cent adds in the electric arc furnace and melts preliminary desiliconization:
C：4.0％；Si：2.55％；Mn：0.70％；P：0.061％；S：0.081％；
Cr:3.00%; Ni:4.45%; All the other are Fe and unavoidable impurities.
Add lime 3300kg in three batches, blowing oxygen quantity 50Nm
3/ PM, the smelting through 90 minutes, (C, Si, Mn have oxidation in desiliconization process), the weight percent of the composition of molten iron is before the electric furnace steel tapping: C:2.34%; Si:0.09%; Mn:0.20%; P:0.073%; S:0.069%; Cr:3.36%; Ni:4.75%; All the other are Fe and unavoidable impurities.
The electric furnace steel tapping temperature is 1643 ℃.
II removes electric furnace slag and is blended into the AOD stove
After removing the slag on electric furnace molten iron surface, the high phosphorus hot metal of mentioned component is blended in the AOD stove.
The III dephosphorization
In 1507 ℃ the molten iron in being blended into the AOD stove, disposable adding lime 1500kg, fluorite 500kg, basicity R is 4.42, send the oxygen-nitrogen mixture body, and oxidation C heats up, and the volume ratio of nitrogen and oxygen is 1: 4, and the distribution amount is 1.35Nm
3/ t.min blew 7 minutes, sampling analysis, and the content of sample P is 0.021%, reaches requirement, this moment, molten iron temperature was 1470 ℃.
Each element wt per-cent of molten iron is behind the dephosphorization:
C：1.03％；Si：0.07％；Mn；0.11％；P：0.021％；S：0.038％；
Cr:2.89%; Ni:4.85%; All the other are Fe and unavoidable impurities.
Removing the oxidation slag promptly gets and hangs down the P molten iron.
Present embodiment shared 7 minutes from dephosphorization.
The present embodiment dephosphorization rate reaches 71.23%, and chromium loss 0.47% is blended into chromium hot melt adjustment composition again.
Embodiment two
Present embodiment is a following sequential steps:
The preliminary desiliconization of I EAF
With composition is that the high phosphorus chromium nickel pig iron 75.4t of following weight per-cent adds in the electric arc furnace and melts preliminary desiliconization:
C：4.0％；Si：2.55％；Mn：0.70％；P：0.061％；S：0.081％；
Cr:3.00%; Ni:4.8%; All the other are Fe and unavoidable impurities.
Add lime 3300kg in three batches, blowing oxygen quantity 50Nm
3/ PM, the smelting through 90 minutes, (C, Si, Mn have oxidation in desiliconization process), the weight percent of the composition of molten iron is before the electric furnace steel tapping: C:2.34%; Si:0.05%; Mn:0.25%; P:0.051%; S:0.069%; Cr:3.36%; Ni:4.75%; All the other are Fe and unavoidable impurities.
The electric furnace steel tapping temperature is 1637 ℃.
II removes electric furnace slag and is blended into the AOD stove
After removing the slag on electric furnace molten iron surface, the high phosphorus hot metal of mentioned component is blended in the AOD stove.
The III dephosphorization
In 1481 ℃ the molten iron in being blended into the AOD stove, disposable adding lime 1500kg, fluorite 500kg, basicity R is 4.1, send the oxygen-nitrogen mixture body, and oxidation C heats up, and the volume ratio of nitrogen and oxygen is 1: 4, and the distribution amount is 1.35Nm
3/ t.min blew 7 minutes, sampling analysis, and the content of sample P is 0.038%, reaches requirement, this moment, molten iron temperature was 1502 ℃.
Each element wt per-cent of molten iron is behind the dephosphorization:
C：1.23％；Si：0.07％；Mn：0.15％；P：0.038％；S：0.036％；
Cr:2.92%; Ni:4.85%; All the other are Fe and unavoidable impurities.
Removing the oxidation slag promptly gets and hangs down the P molten iron.
Present embodiment from the desiliconization to the dephosphorization totally 7 minutes.
The present embodiment dephosphorization rate reaches 25.5%, and chromium loss 0.44% is blended into chromium hot melt adjustment composition again.
Embodiment three
Present embodiment is a following sequential steps:
The preliminary desiliconization of I EAF
With composition is that the high phosphorus chromium nickel pig iron 74.4t of following weight per-cent adds in the electric arc furnace and melts preliminary desiliconization:
C：4.0％；Si：2.45％；Mn：0.70％；P：0.061％；S：0.081％；
Cr:3.00%; Ni:5.8%; All the other are Fe and unavoidable impurities.
Add lime 3300kg in three batches, blowing oxygen quantity N50m
3/ PM, the smelting through 90 minutes, (C, Si, Mn have oxidation in desiliconization process), the weight percent of the composition of molten iron is before the electric furnace steel tapping: C:2.58%; Si:0.26%; Mn:0.3%; P:0.098%; S:0.067%; Cr:3.32%; Ni:6.23%; All the other are Fe and unavoidable impurities.
The electric furnace steel tapping temperature is 1643 ℃.
II removes electric furnace slag and is blended into the AOD stove
After removing the slag on electric furnace molten iron surface, the high phosphorus hot metal of mentioned component is blended in the AOD stove.
The III dephosphorization
In 1498 ℃ the molten iron in being blended into the AOD stove, disposable adding lime 1500kg, fluorite 500kg, basicity R is 3.82, send the oxygen-nitrogen mixture body, and oxidation C heats up, and the volume ratio of nitrogen and oxygen is 1: 4, and the distribution amount is 1.35Nm
3/ t.min blew 7 minutes, sampling analysis, and the content of sample P is 0.029%, reaches requirement, this moment, molten iron temperature was 1500 ℃.
Each element wt per-cent of molten iron is behind the dephosphorization:
C：1.47％；Si：0.09％；Mn：0.20％；P：0.029％；S：0.033％；
Cr:2.78%; Ni:6.77%; All the other are Fe and unavoidable impurities.
Removing the oxidation slag promptly gets and hangs down the P molten iron.
Shared 7 minutes of present embodiment dephosphorization.
The present embodiment dephosphorization rate reaches 70.4%, and chromium loss 0.54% is blended into chromium hot melt adjustment composition again.
Embodiment four
Present embodiment is a following sequential steps:
The preliminary desiliconization of I EAF
With composition is that the high phosphorus chromium ferronickel 74.9t of following weight per-cent adds preliminary desiliconization in the electric arc furnace:
C：4.0％；Si：2.5％；Mn：0.60％；P：0.060％；S：0.060％；
Cr:3.20%; Ni:4.8%; All the other are Fe and unavoidable impurities.
Add lime 3300kg in three batches, blowing oxygen quantity 50Nm
3/ PM, the smelting through 90 minutes, the weight percent of the composition of molten iron is before the electric furnace steel tapping:
C：3.07％；Si：0.33％；Mn：0.25％；P：0.060％；S：0.070％；
Cr:3.02%; Ni:3.94%; All the other are Fe and unavoidable impurities.
Electric furnace steel tapping temperature temperature is 1633 ℃.
II removes electric furnace slag and is blended into converter
After removing the slag on electric furnace molten iron surface, the high phosphorus hot metal of mentioned component is blended in the converter.
The III dephosphorization
In the temperature that is blended into converter is 1442 ℃ molten iron, disposable adding lime 1500kg, fluorite 500kg, basicity R is 2.6, send the oxygen-nitrogen mixture body, and oxidation C heats up, and the volume ratio of nitrogen and oxygen is 1: 4, and the distribution amount is 1.35Nm
3/ t.min blew 6 minutes, sampling analysis, and the content of sample P is 0.034%, reaches requirement, this moment, molten iron temperature was 1460 ℃.
Each element wt per-cent of molten iron is behind the dephosphorization:
C：2.01％；Si：0.05％；Mn：0.35％；P：0.034％；S：0.035％；
Cr:2.8%; Ni:4.36%; All the other are Fe and unavoidable impurities.
Removing the oxidation slag promptly gets and hangs down the P molten iron.
Shared 6 minutes of present embodiment dephosphorization.
The present embodiment dephosphorization rate reaches 43.3%, and chromium loss 0.22% is blended into chromium hot melt adjustment composition again.
Embodiment five
Present embodiment is a following sequential steps:
The preliminary desiliconization of I EAF
With composition is that the high phosphorus chromium ferronickel 75t of following weight per-cent adds preliminary desiliconization in the electric arc furnace:
C：4.0％；Si：2.5％；Mn：0.60％；P：0.060％；S：0.060％；
Cr:3.20%; Ni:4.8%; All the other are Fe and unavoidable impurities.
Add lime 3300kg in three batches, blowing oxygen quantity 50Nm
3/ PM, the smelting through 90 minutes, the weight percent of the composition of molten iron is before the electric furnace steel tapping:
C：3.0％；Si：0.35％；Mn：0.27％；P：0.062％；S：0.071％；
Cr:3.05%; Ni:3.92%; All the other are Fe and unavoidable impurities.
II carries out the ladle hot metal pretreatment after removing electric furnace slag
After removing the slag on electric furnace molten iron surface, beginning ladle hot metal pretreatment is taken off P, 1480 ℃ of liquid steel temperatures.
The III dephosphorization
In ladle, add lime 1500kg in two batches, fluorite 500kg, basicity R is 3, is blown into oxygen, and oxidation C heats up, and the distribution amount is 0.5-5Nm
3/ ton steel. divide, blew 10 minutes, sampling analysis, the content of sample P is 0.037%, reaches requirement, this moment, molten iron temperature was 1520 ℃.
Each element wt per-cent of molten iron is behind the dephosphorization:
C：2.01％；Si：0.05％；Mn：0.34％；P：0.037％；S：0.034％；
Cr:2.95%; Ni:4.05%; All the other are Fe and unavoidable impurities.
Removing the oxidation slag promptly gets and hangs down the P molten iron.
Shared 10 minutes of present embodiment dephosphorization.
The present embodiment dephosphorization rate reaches 47.88%, and chromium loss 0.1% is blended into chromium hot melt adjustment composition again.
Claims (2)
1. the method for a high phosphorus chromium nickel pig iron dephosphorization, it comprises following sequential steps:
The preliminary desiliconization of I EAF
The high phosphorus chromium nickel pig iron added in the electric arc furnace melts, preliminary desiliconization, after the desiliconization in the molten iron weight percentage of silicon be 0.05-1.0%;
II removes electric furnace slag and is blended into AOD stove or converter, and molten iron temperature is 1400-1550 ℃;
The III dephosphorization
In the molten iron that is blended into, add lime and fluorite, add-on is a lime 6-45kg/ ton steel, fluorite 1-34kg/ ton steel, basicity R is 1-5, is blown into oxygen, nitrogen mixture gas, the ratio of oxygen and nitrogen is 2: 1-5: 1, the distribution amount is 0.5-3Nm
3/ ton steel. divide, behind the content of molten steel P≤0.04%, remove the oxidation slag, promptly get low-phosphorous molten iron.
2. the method for a high phosphorus chromium nickel pig iron dephosphorization, it comprises following sequential steps:
The preliminary desiliconization of I EAF
The high phosphorus chromium nickel pig iron added in the electric arc furnace melts, preliminary desiliconization, after the desiliconization in the molten iron weight percentage of silicon be 0.05-1.0%;
II carries out the ladle hot metal pretreatment after removing electric furnace slag
After removing the slag on electric furnace molten iron surface, beginning ladle hot metal pretreatment is taken off P, liquid steel temperature 1400-1550 ℃;
The III dephosphorization
In molten iron, add lime and fluorite, add-on is a lime 6-45kg/ ton steel, fluorite 1-34kg/ ton steel, basicity R is 1-5, is blown into oxygen, and oxidation C heats up, and the distribution amount is 0.5-5Nm
3/ ton steel. divide, behind the content of molten steel P≤0.04%, remove the oxidation slag, promptly get low-phosphorous molten iron.
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| CN103184314A (en) * | 2013-03-12 | 2013-07-03 | 邢台钢铁有限责任公司 | Smelting method for dephosphorization of hot metal in AOD furnace |
| CN103667595A (en) * | 2013-12-20 | 2014-03-26 | 德龙钢铁有限公司 | High-efficiency high-phosphorus molten iron dephosphorizing method used in molten iron mixing process |
| CN108998616A (en) * | 2018-09-14 | 2018-12-14 | 山东国铭球墨铸管科技有限公司 | A kind of purification of the pig iron and its smelting process |
| CN109055661A (en) * | 2018-09-14 | 2018-12-21 | 中航上大高温合金材料有限公司 | A kind of production technology of low-phosphorous stainless steel |
| EP4212637A4 (en) * | 2020-09-10 | 2024-02-28 | JFE Steel Corporation | Method for manufacturing low-phosphorous molten iron |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103184314A (en) * | 2013-03-12 | 2013-07-03 | 邢台钢铁有限责任公司 | Smelting method for dephosphorization of hot metal in AOD furnace |
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| CN109055661A (en) * | 2018-09-14 | 2018-12-21 | 中航上大高温合金材料有限公司 | A kind of production technology of low-phosphorous stainless steel |
| EP4212637A4 (en) * | 2020-09-10 | 2024-02-28 | JFE Steel Corporation | Method for manufacturing low-phosphorous molten iron |
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Application publication date: 20120111 |