CN105018669A - Method for producing technically pure iron for nuclear power - Google Patents
Method for producing technically pure iron for nuclear power Download PDFInfo
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- CN105018669A CN105018669A CN201510414523.5A CN201510414523A CN105018669A CN 105018669 A CN105018669 A CN 105018669A CN 201510414523 A CN201510414523 A CN 201510414523A CN 105018669 A CN105018669 A CN 105018669A
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Abstract
The invention discloses a method for producing technically pure iron for nuclear power. The method includes the steps that after blast furnace molten iron is pretreated and desulfurated, Mn and P of the molten iron are primarily removed through an AOD converter, so that half-molten steel and iron with the low P and S is obtained; the half-molten steel and iron is smelted by a BOF converter and refined by an LF furnace, then the molten steel is subjected to vacuum decarbonization and deoxidation treatment through an RH furnace, and accordingly technically pure iron molten steel can be obtained. According to the method, equipment and investment do not need to be increased, existing equipment is fully used for process combination, and the metallurgy process is reasonably controlled through the AOD converter, the LF furnace and the RH furnace according to the metallurgy theory, so that the purpose of producing the advanced technically pure iron through common ore raw materials is achieved, and the melt-casting demand by nuclear power industrial users is also met. Under the condition that the steel situation is increasingly severe, the cost of the technically pure iron is lowered so that the user needs can be met, and a guarantee is provided for enterprises to promote strategic positions and to continuously dominate high-end customer markets.
Description
Technical field
The invention belongs to smelting iron and steel production technical field, especially a kind of production method of nuclear power technically pure iron.
Background technology
Technically pure iron is the important materials of Nuclear Power Industry founding forging, possesses the feature of low-carbon (LC), low-phosphorous, low-sulfur, low aluminium, use as flux in midium-carbon steel is smelted, it can also as the base mateiral of the special metal materials such as low carbon stainless steel, powder metallurgy, amorphous alloy.
Technically pure iron due to its carbon content extremely low, therefore converter adopts non-deoxidation to tap, and the thermodynamic condition of Dephosphorization, desulfurization is different, also needs different process to realize.Existing smelting process adopts the operational path of just furnace (converter or electric arc furnace)+vacuum oven, because tapping temperature is higher, and the easy rephosphorization of molten steel, sulphur.And this technique requires higher for material condition, needs to adopt low manganese raw material production; Simultaneously owing to producing according to billet caster in steel, casting wadding stream situation is difficult to avoid.
International rolled steel market worsened in recent years, how to adopt common raw material manufacture pure iron, how to use billet continuous casting to produce half rimming steel, reduce raw materials cost and production cost, and supporting the production of technically pure iron, is a problem demanding prompt solution.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of production method of nuclear power technically pure iron of low cost, to obtain the technically pure iron of high cleanliness, low impurity.
For solving the problems of the technologies described above, the technical solution used in the present invention is: it by after pretreatment desulfurizing, then carries out molten iron just de-Mn, P through AOD converter by blast-melted, obtains half steel water of low P, S; Described half steel water is through BOF converter smelting, the refining of LF stove, and then molten steel carries out vacuum decarburization, deoxidation treatment through RH stove, can obtain described technically pure iron molten steel.
Further, the method for the invention step is: (1) is blast-melted carries out desulfurization through blowing magnesium process, makes S≤0.006wt% in molten iron;
(2) molten iron after desulfurization utilizes AOD furnace tentatively to take off Mn, P operation;
(3) smelt after described half steel water is blended into BOF converter, in tapping molten steel, composition by weight percent is: C≤0.04%, P≤0.007%, S≤0.006%; Converter finishing slag dual alkalinity is 3 ~ 4; In ladle, lime top slag 2 ~ 3kg/T is added, argon gas strong mixing during tapping;
(4) the tapping molten steel of BOF converter enters the refining of LF stove, adds desulfurization lime 2 ~ 4kg/T and heats up, and is warming up to 1640 ~ 1660 DEG C, argon gas strong mixing; Heat complete carrying out and determine oxygen operation, close Ladle Bottom and blow, on the top of the slag, add refining ladle slag modifier, and add aluminum shot and carry out deoxidation; Carry out heating 1 ~ 2 minute after refining ladle slag modifier adds, slag finishing slag basicity controls 10 ~ 15;
(5) the tapping molten steel of LF stove is transported to RH stove and carries out Decarburization Operation, and after entering the station, circulation determines oxygen in 3 minutes; Adopt OB technique to carry out decarburization, OB starts the full pump of rear employing and vacuumizes process, minimum below vacuum degree control 120pa; After OB terminates, add small-particle Wingdale carry out carbonization treatment from RH stove alloy hopper, control decarburization circulation time >=8 minute, decarburization terminates to determine oxygen;
(6), after decarburization terminates, aluminum shot deoxidation is adopted;
(7), after steel treatment deoxidation treatment, upper continuous caster casting, molten steel composition mass percent: C≤0.0030%, S, P≤0.006%, Al≤0.0050%, all the other are Fe and inevitable impurity.
Further, in step of the present invention (2), after de-Mn, P in gained half steel water composition comprise: C 3.0 ~ 3.5wt%, Mn < 0.10wt%, S≤0.006wt%, P≤0.040wt%, Si≤0.01wt%.
Further, in step of the present invention (4), the Ingredients Weight content of refining ladle slag modifier is: CaO 20 ~ 28%, Al
2o
323 ~ 30%, SiO
22 ~ 8%, S 0 ~ 0.15%, P 0 ~ 0.05%, Al 37 ~ 43%; The add-on of refining ladle slag modifier is 3kg/T.
In described step (4), determining oxygen value 450pppm according to molten steel is benchmark, adds aluminum amount and is: [65+ ([O]-450)/6] kg; Often increase and decrease 60ppm oxygen level, aluminum shot add-on increase and decrease 10kg.
In described step (4), the bottom blowing flow that argon gas strong mixing adopts is 100L/min ~ 150L/min.
Further, in step of the present invention (5), the oxygen amount of determining after entering the station is 200 ~ 400ppm.
In described step (5): the Wingdale adding 2 ~ 5kg/T from alloy hopper.
Further, in step of the present invention (6): the Control for Oxygen Content leaving from station after aluminum shot deoxidation is at 20 ~ 35ppm; Aluminum shot consumption is calculated by 10kg aluminum shot deoxidation 70ppm.
The beneficial effect adopting technique scheme to produce is: smelting process of the present invention utilizes the operational path of AOD-BOF-LF-RH-CCM can produce the pure iron steel grade of the high and low impurity of purity; Utilize various existing metallurgical equipment to design according to desulfurization, dephosphorization, demanganize, decarburization theory, thus reach the object utilizing low price raw material to produce high-grade technically pure iron.
The present invention is without the need to increasing equipment and investment, make full use of existing installation and carry out process combination, according to metallurgical theory, adopt the metallurgical process of AOD furnace, LF-RH stove conservative control, achieve the object using common ore to produce advanced industrial pure iron, also meet the demand that Nuclear Power Industry user casts for melting.The present invention, in the increasingly serious situation of iron and steel situation, had both reduced technically pure iron cost and had met user's needs, was also enterprise's Strategies of Promoting status, constantly occupied high-end customer and provided guarantee.
Embodiment
Below in conjunction with specific embodiment, the present invention is further detailed explanation.
This nuclear power is as described below with the processing step of the production method of technically pure iron:
(1) desulfurization operations is carried out at the blast-melted magnesium winding-up process desulfurization station that utilizes, and make molten iron S≤0.006wt%, then molten iron enters hot metal mixer.
(2), after hot metal mixer taps a blast furnace, utilize AOD furnace resistance to material tentatively to take off Mn, P operation latter stage, now AOD furnace is owing to being the non-stainless steel production cycle, but resistance to material can also be used for carbon steel production, and therefore belong to and utilize waste and old resistance to material, production cost is low.Composition in half steel water obtained: C 3.0 ~ 3.5wt%, Mn < 0.10wt%, S≤0.006wt%, P≤0.040wt%, Si≤0.01wt%.
(3) smelt after half steel water of AOD furnace is blended into BOF converter, the weight percent of composition in tapping molten steel: C≤0.04%, P≤0.007%, S≤0.006%; Converter finishing slag dual alkalinity is 3 ~ 4; In ladle, lime top slag 2 ~ 3kg/T is added, argon gas strong mixing during tapping.
(4) LF arrives at a station and adds desulfurization lime 2 ~ 4kg/T and heat up, and is warming up to 1640 ~ 1660 DEG C; Argon gas strong mixing (bottom blowing flow is 100L/min ~ 150L/min).Heating complete carrying out and determine oxygen operation, on the top of the slag, being evenly sprinkled into refining ladle slag modifier according to determining oxygen value in batches; Before adding refining ladle slag modifier, close Ladle Bottom and blow.In refining ladle slag modifier, the weight content of composition is: CaO 20 ~ 28%, Al
2o
323 ~ 30%, SiO
22 ~ 8%, S 0 ~ 0.15%, P 0 ~ 0.05%, Al 37 ~ 43%.The add-on of refining ladle slag modifier is 3kg/T, simultaneously determining oxygen value 450pppm according to molten steel is that benchmark adds aluminum shot and carries out deoxidation, adding aluminum amount is: [65+ ([O]-450)/6] kg, often increases and decreases 60ppm oxygen level, aluminum shot add-on increase and decrease 10kg; Carry out heating 1 ~ 2 minute after refining ladle slag modifier adds, slag finishing slag basicity controls 10 ~ 15.
(5) molten steel is transported to RH stove and carries out Decarburization Operation, after entering the station, circulation determines oxygen (enter the station control 200 ~ 400ppm) for 3 minutes; Determine OB technique (oxygen blast pressure decarburization) blowing oxygen quantity depending on the oxygen degree that enters the station, OB starts the full pump of rear employing and vacuumizes process, minimum below vacuum degree control 120pa; After OB terminates, add small-particle Wingdale 2 ~ 5kg/T from RH alloy hopper, control decarburization circulation time >=8 minute, decarburization terminates to determine oxygen.
(6) after decarburization terminates, adopt aluminum shot deoxidation, Control for Oxygen Content leaving from station, at 20 ~ 35ppm, calculates aluminum shot consumption by 10kg aluminum shot deoxidation 70ppm.
(7), after steel treatment deoxidation treatment, upper continuous caster casting, the mass percent of composition in molten steel: C≤0.003%, S, P≤0.006%, Al≤0.005%, all the other are Fe and inevitable impurity.
Embodiment 1: this nuclear power production method of technically pure iron adopts following concrete technology.
(1) desulfurization station desulfurized molten iron S 0.006%, enter AOD furnace demanganize operation, the composition by weight percent of half steel is: C 3.5%, S 0.006%, Si 0.01%, Mn 0.07%, P 0.02%.
(2) converter adopts a tank AOD half steel to convert a tank desulphurised hot metal technique, and converter enters stove hot metal composition: C 4.038%, S 0.006%, Si 0.318%, Mn 0.187%, P 0.086%.Tapping temperature 1598 DEG C, adopts shelves slag cone shelves slag, converter finishing slag basicity 3.0, molten steel amount 80.9 tons.Molten steel composition weight percent: C 0.0253%, P 0.0044%, S 0.0060%, Mn 0.05% after tapping, all the other are iron and inevitable impurity.
(3), after converter tapping, add lime top slag 2.8kg/T in ladle, connect BOTTOM ARGON BLOWING, handling is to LF ladle refining furnace; Add lime 3.2kg/T in LF refining process, argon gas stirs 100NL/min, and Heating temperature reaches 1640 DEG C.Heating complete, determine oxygen 510ppm, on the top of the slag, be evenly sprinkled into refining ladle slag modifier 240kg in batches, adding aluminum shot 75kg according to determining oxygen value.Slag finishing slag dual alkalinity reaches 15.0.Sampling, the composition by weight percent of molten steel is: C 0.033%, Mn 0.06%, P 0.009%, S 0.006%, and all the other are iron and inevitable impurity.
(4) ladle is hung RH refining furnace, to oxygen thermometric of standing firm: temperature 1632 DEG C, determine oxygen 200ppm, soaking tub is immersed in molten steel, start the full pump process of vacuum pump.OB oxygen amount 116NM3, adds small-particle Wingdale 5kg/T after OB, decarburization time 8 minutes, and vacuum tightness is minimum to 0.120Kpa.Determine oxygen 410ppm after decarburization, add aluminum shot 60kg, circulation 3min vacuum breaker sampling analysis, dissolved oxygen leaving from station is 35ppm.The composition by weight percent of molten steel is: C 0.0015%, Mn 0.04%, P 0.006%, S 0.0058%, and all the other are iron and inevitable impurity.
(5) molten steel leaving from station after, winch to bloom caster casting, casting direct motion, billet specification 325mm × 280mm.The composition by weight percent of molten steel is: C 0.0030%, Mn 0.04%, P 0.006%, S 0.006%, Al≤0.0050%, and all the other are iron and inevitable impurity.
Embodiment 2: this nuclear power production method of technically pure iron adopts following concrete technology.
(1) desulfurization station desulfurized molten iron S:0.004%, enter AOD furnace demanganize operation, the composition by weight percent of half steel is: C:3.99%, S:0.004%, Si:0.01%, Mn:0.08%, P:0.051%.
(2) converter adopts a tank AOD half steel to convert a tank desulphurised hot metal technique, and converter enters stove hot metal composition: C:4.486%, S:0.004%, Si:0.337%, Mn:0.161%, P:0.094%.Tapping temperature 1616 DEG C, adopts shelves slag cone shelves slag, converter finishing slag basicity 3.7, molten steel amount 82.3 tons.Molten steel composition weight percent after tapping: C:0.0216%, P:0.0070%, S:0.0057%, Mn:0.06%, all the other are iron and inevitable impurity.
(3), after converter tapping, add lime top slag 2.0kg/T in ladle, connect BOTTOM ARGON BLOWING, handling is to LF ladle refining furnace; Add lime 4.0kg/T in LF refining process, argon gas strong mixing 125NL/min, Heating temperature reaches 1641 DEG C.Heating complete, determine oxygen 495ppm, on the top of the slag, be evenly sprinkled into refining ladle slag modifier 240kg in batches, adding aluminum shot 72kg according to determining oxygen value.Slag finishing slag dual alkalinity reaches 10.Sampling, the composition by weight percent of molten steel is: C:0.032%, Mn:0.06%, P:0.008%, S:0.006%, and all the other are iron and inevitable impurity.
(4) ladle is hung RH refining furnace, to oxygen thermometric of standing firm: temperature 1630 DEG C, determine oxygen 209ppm, soaking tub is immersed in molten steel, start the full pump process of vacuum pump.OB oxygen amount 95NM3, adds small-particle Wingdale 2kg/T after OB, decarburization time 8 minutes, and vacuum tightness is minimum to 0.09Kpa.Determine oxygen 373ppm after decarburization, add aluminum shot 55kg, circulation 3min vacuum breaker sampling analysis, dissolved oxygen 20ppm leaving from station.The composition by weight percent of molten steel is: C:0.0021%, Mn:0.05%, P:0.006%, S:0.0046%, and all the other are iron and inevitable impurity.
(5) molten steel leaving from station after, winch to bloom caster casting, casting direct motion, billet specification 325mm × 280mm.The composition by weight percent of molten steel is: C:0.0024%, Mn:0.05%, P:0.006%, S:0.006%, Al≤0.0017%, and all the other are iron and inevitable impurity.
Embodiment 3: this nuclear power production method of technically pure iron adopts following concrete technology.
(1) desulfurization station desulfurized molten iron S:0.004%, enter AOD furnace demanganize operation, the composition by weight percent of half steel is: C:3.0%, S:0.003%, Si:0.01%, Mn:0.10%, P:0.040%.
(2) converter adopts a tank AOD half steel to convert a tank desulphurised hot metal technique, and converter enters stove hot metal composition: C:4.512%, S:0.004%, Si:0.433%, Mn:0.268%, P:0.095%.Tapping temperature 1629 DEG C, adopts shelves slag cone shelves slag, converter finishing slag basicity 4.0, molten steel amount 80.2 tons.Molten steel composition weight percent after tapping: C:0.0291%, P:0.0041%, S:0.0060%, Mn:0.04%, all the other are iron and inevitable impurity.
(3), after converter tapping, add lime top slag 3.0kg/T in ladle, connect BOTTOM ARGON BLOWING, handling is to LF ladle refining furnace; Add lime 3.0kg/T in LF refining process, argon gas strong mixing 150NL/min, Heating temperature reaches 1660 DEG C.Heating complete, determine oxygen 450ppm, on the top of the slag, be evenly sprinkled into refining ladle slag modifier 240kg in batches, adding aluminum shot 65kg according to determining oxygen value.Slag finishing slag dual alkalinity reaches 13.6.Sampling, the composition by weight percent of molten steel is: C:0.028%, Mn:0.06%, P:0.007%, S:0.006%, and all the other are iron and inevitable impurity.
(4) ladle is hung RH refining furnace, to oxygen thermometric of standing firm: temperature 1654 DEG C, determine oxygen 400ppm, soaking tub is immersed in molten steel, start the full pump process of vacuum pump.OB oxygen amount 53NM3, adds small-particle Wingdale 3kg/T after OB, decarburization time 8 minutes, and vacuum tightness is minimum to 0.09Kpa.Determine oxygen 528ppm after decarburization, add aluminum shot 75kg, circulation 3min vacuum breaker sampling analysis, dissolved oxygen 31ppm leaving from station.The composition by weight percent of molten steel is: C:0.0018%, Mn:0.04%, P:0.0056%, S:0.0052%, and all the other are iron and inevitable impurity.
(5) molten steel leaving from station after, winch to bloom caster casting, casting direct motion, billet specification 325mm × 280mm.The composition by weight percent of molten steel is: C:0.0021%, Mn:0.04%, P:0.0050%, S:0.0050%, Al≤0.0017%, and all the other are iron and inevitable impurity.
Embodiment 4: this nuclear power production method of technically pure iron adopts following concrete technology.
(1) desulfurization station desulfurized molten iron S:0.003%, enter AOD furnace demanganize operation, the composition by weight percent of half steel is: C:3.0%, S:0.003%, Si:0.01%, Mn:0.10%, P:0.040%.
(2) converter adopts a tank AOD half steel to convert a tank desulphurised hot metal technique, and converter enters stove hot metal composition: C:4.037%, S:0.003%, Si:0.416%, Mn:0.359%, P:0.091%.Tapping temperature 1639 DEG C, adopts shelves slag cone shelves slag, converter finishing slag basicity 3.5, molten steel amount 78.1 tons.Molten steel composition weight percent after tapping: C:0.0361%, P:0.0049%, S:0.0060%, Mn:0.06%, all the other are iron and inevitable impurity.
(3), after converter tapping, add lime top slag 2.0kg/T in ladle, connect BOTTOM ARGON BLOWING, handling is to LF ladle refining furnace; Add lime 4.0kg/T in LF refining process, argon gas strong mixing 130NL/min, Heating temperature reaches 1655 DEG C.Heating complete, determine oxygen 420ppm, on the top of the slag, be evenly sprinkled into refining ladle slag modifier 240kg in batches, adding aluminum shot 70kg according to determining oxygen value.Slag finishing slag dual alkalinity reaches 11.8.Sampling, the composition by weight percent of molten steel is: C:0.041%, Mn:0.05%, P:0.004%, S:0.006%, and all the other are iron and inevitable impurity.
(4) ladle is hung RH refining furnace, to oxygen thermometric of standing firm: temperature 1630 DEG C, determine oxygen 336ppm, soaking tub is immersed in molten steel, start the full pump process of vacuum pump.OB oxygen amount 84NM3, adds small-particle Wingdale 4kg/T after OB, decarburization time 8 minutes, and vacuum tightness is minimum to 0.101Kpa.Determine oxygen 409ppm after decarburization, add aluminum shot 60kg, circulation 3min vacuum breaker sampling analysis, dissolved oxygen 28ppm leaving from station.The composition by weight percent of molten steel is: C:0.0016%, Mn:0.04%, P:0.0051%, S:0.0056%, and all the other are iron and inevitable impurity.
(5) molten steel leaving from station after, winch to bloom caster casting, casting direct motion, billet specification 325mm × 280mm.The composition by weight percent of molten steel is: C:0.0030%, Mn:0.04%, P:0.0050%, S:0.0060%, Al≤0.0015%, and all the other are iron and inevitable impurity.
Embodiment 5: this nuclear power production method of technically pure iron adopts following concrete technology.
(1) desulfurization station desulfurized molten iron S:0.003%, enter AOD furnace demanganize operation, the composition by weight percent of half steel is: C:3.71%, S:0.005%, Si:0.01%, Mn:0.07%, P:0.040%.
(2) converter adopts a tank AOD half steel to convert a tank desulphurised hot metal technique, and converter enters stove hot metal composition: C:3.817%, S:0.003%, Si:0.342%, Mn:0.353%, P:0.095%.Tapping temperature 1640 DEG C, adopts shelves slag cone shelves slag, converter finishing slag basicity 3.6, molten steel amount 80.5 tons.Molten steel composition weight percent after tapping: C:0.0361%, P:0.0049%, S:0.0050%, Mn:0.06%, all the other are iron and inevitable impurity.
(3), after converter tapping, add lime top slag 2.5kg/T in ladle, connect BOTTOM ARGON BLOWING, handling is to LF ladle refining furnace; Add lime 3.5kg/T in LF refining process, argon gas strong mixing 135NL/min, Heating temperature reaches 1651 DEG C.Heating complete, determine oxygen 520ppm, on the top of the slag, be evenly sprinkled into refining ladle slag modifier 240kg in batches, adding aluminum shot 77kg according to determining oxygen value.Slag finishing slag dual alkalinity reaches 14.3.Sampling, the composition by weight percent of molten steel is: C:0.035%, Mn:0.08%, P:0.008%, S:0.005%, and all the other are iron and inevitable impurity.
(4) ladle is hung RH refining furnace, to oxygen thermometric of standing firm: temperature 1649 DEG C, determine oxygen 306ppm, soaking tub is immersed in molten steel, start the full pump process of vacuum pump.OB oxygen amount 55NM3, adds small-particle Wingdale 4kg/T after OB, decarburization time 8 minutes, and vacuum tightness is minimum to 0.103Kpa.Determine oxygen 398ppm after decarburization, add aluminum shot 57kg, circulation 3min vacuum breaker sampling analysis, dissolved oxygen 20ppm leaving from station.The composition by weight percent of molten steel is: C:0.0025%, Mn:0.05%, P:0.0055%, S:0.0056%, and all the other are iron and inevitable impurity.
(5) molten steel leaving from station after, winch to bloom caster casting, casting direct motion, billet specification 325mm × 280mm.The composition by weight percent of molten steel is: C:0.0030%, Mn:0.05%, P:0.006%, S:0.006%, Al≤0.0017%, and all the other are iron and inevitable impurity.
Claims (9)
1. a production method for nuclear power technically pure iron, is characterized in that: it by after pretreatment desulfurizing, then carries out molten iron just de-Mn, P through AOD converter by blast-melted, obtains half steel water of low P, S; Described half steel water is through BOF converter smelting, the refining of LF stove, and then molten steel carries out vacuum decarburization, deoxidation treatment through RH stove, can obtain described technically pure iron molten steel.
2. the production method of a kind of nuclear power technically pure iron according to claim 1, it is characterized in that, described method steps is: (1) is blast-melted carries out desulfurization through blowing magnesium process, makes S≤0.006wt% in molten iron;
(2) molten iron after desulfurization utilizes AOD furnace tentatively to take off Mn, P operation;
(3) smelt after described half steel water is blended into BOF converter, in tapping molten steel, composition by weight percent is: C≤0.04%, P≤0.007%, S≤0.006%; Converter finishing slag dual alkalinity is 3 ~ 4; In ladle, lime top slag 2 ~ 3kg/T is added, argon gas strong mixing during tapping;
(4) the tapping molten steel of BOF converter enters the refining of LF stove, adds desulfurization lime 2 ~ 4kg/T and heats up, and is warming up to 1640 ~ 1660 DEG C, argon gas strong mixing; Heat complete carrying out and determine oxygen operation, close Ladle Bottom and blow, on the top of the slag, add refining ladle slag modifier, and add aluminum shot and carry out deoxidation; Carry out heating 1 ~ 2 minute after refining ladle slag modifier adds, slag finishing slag basicity controls 10 ~ 15;
(5) the tapping molten steel of LF stove is transported to RH stove and carries out Decarburization Operation, and after entering the station, circulation determines oxygen in 3 minutes; Adopt OB technique to carry out decarburization, OB starts the full pump of rear employing and vacuumizes process, minimum below vacuum degree control 120pa; After OB terminates, add small-particle Wingdale carry out carbonization treatment from the alloy hopper of RH stove, control decarburization circulation time >=8 minute, decarburization terminates to determine oxygen;
(6), after decarburization terminates, aluminum shot deoxidation is adopted;
(7), after steel treatment deoxidation treatment, upper continuous caster casting, molten steel composition mass percent: C≤0.0030%, S, P≤0.006%, Al≤0.0050%, all the other are Fe and inevitable impurity.
3. the production method of a kind of nuclear power technically pure iron according to claim 2, it is characterized in that: in described step (2), after de-Mn, P in gained half steel water composition comprise: C 3.0 ~ 3.5wt%, Mn < 0.10wt%, S≤0.006wt%, P≤0.040wt%, Si≤0.01wt%.
4. the production method of a kind of nuclear power technically pure iron according to claim 2, is characterized in that, in described step (4), the Ingredients Weight content of refining ladle slag modifier is: CaO 20 ~ 28%, Al
2o
323 ~ 30%, SiO
22 ~ 8%, S 0 ~ 0.15%, P 0 ~ 0.05%, Al 37 ~ 43%; The add-on of refining ladle slag modifier is 3kg/T.
5. the production method of a kind of nuclear power technically pure iron according to claim 2, is characterized in that: in described step (4), and determining oxygen value 450pppm according to molten steel is benchmark, and aluminum shot add-on is: [65+ ([O]-450)/6] kg; Often increase and decrease 60ppm oxygen level, aluminum shot add-on increase and decrease 10kg.
6. the production method of a kind of nuclear power technically pure iron according to claim 2, is characterized in that: in described step (4), and the bottom blowing flow that argon gas strong mixing adopts is 100L/min ~ 150L/min.
7. the production method of a kind of nuclear power technically pure iron according to claim 2, is characterized in that, in described step (5), the oxygen amount of determining after entering the station is 200 ~ 400ppm.
8. the production method of a kind of nuclear power technically pure iron according to claim 2 any one, is characterized in that, in described step (5): the Wingdale adding 2 ~ 5kg/T from alloy hopper.
9. the production method of a kind of nuclear power technically pure iron according to claim 2-8 any one, is characterized in that, in described step (6): the Control for Oxygen Content leaving from station after aluminum shot deoxidation is at 20 ~ 35ppm; Aluminum shot consumption is calculated by 10kg aluminum shot deoxidation 70ppm.
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| CN110205439A (en) * | 2019-07-17 | 2019-09-06 | 攀钢集团钛业有限责任公司 | The method of EBT electric arc furnace smelting production ingot iron |
| CN112795720A (en) * | 2020-12-12 | 2021-05-14 | 河钢股份有限公司 | Method for producing industrial pure iron by duplex converter method |
| CN114480944A (en) * | 2021-11-29 | 2022-05-13 | 安阳钢铁股份有限公司 | Preparation method of ultralow-carbon low-silicon low-aluminum steel |
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| CN108277316B (en) * | 2017-01-05 | 2020-01-07 | 鞍钢股份有限公司 | Production method of pure iron |
| CN108277316A (en) * | 2017-01-05 | 2018-07-13 | 鞍钢股份有限公司 | A kind of production method of pure iron |
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| CN109852761A (en) * | 2019-03-07 | 2019-06-07 | 包头钢铁（集团）有限责任公司 | A kind of production method of ingot iron |
| CN110205439A (en) * | 2019-07-17 | 2019-09-06 | 攀钢集团钛业有限责任公司 | The method of EBT electric arc furnace smelting production ingot iron |
| CN110205439B (en) * | 2019-07-17 | 2021-03-16 | 攀钢集团钛业有限责任公司 | Method for producing industrial pure iron by smelting in EBT electric arc furnace |
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| CN114480944A (en) * | 2021-11-29 | 2022-05-13 | 安阳钢铁股份有限公司 | Preparation method of ultralow-carbon low-silicon low-aluminum steel |
| CN114908281A (en) * | 2022-04-19 | 2022-08-16 | 包头钢铁（集团）有限责任公司 | Production method of low-sulfur low-oxygen high-purity industrial pure iron |
| CN114908281B (en) * | 2022-04-19 | 2023-08-25 | 包头钢铁（集团）有限责任公司 | Production method of low-sulfur low-oxygen high-purity industrial pure iron |
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