CN113174462A - Method for smelting electromagnetic pure iron by converter double-slag method - Google Patents
Method for smelting electromagnetic pure iron by converter double-slag method Download PDFInfo
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- CN113174462A CN113174462A CN202110429062.4A CN202110429062A CN113174462A CN 113174462 A CN113174462 A CN 113174462A CN 202110429062 A CN202110429062 A CN 202110429062A CN 113174462 A CN113174462 A CN 113174462A
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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
- C21C5/35—Blowing from above and through the bath
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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
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/10—Handling in a vacuum
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Abstract
The invention discloses a method for smelting electromagnetic pure iron by a converter double-slag method, which comprises the following steps: (1) adding the pre-desulfurized molten iron into a converter, adding 60-70% of ore and 10% -30% of lime to form slag with the alkalinity of 3.5-5, and pouring out the generated slag by carrying out one-time gun position control, one-time oxygen supply intensity control and one-time bottom blowing air supply intensity control in the process, wherein the slag pouring amount is 20-50% of the total slag amount; (2) continuously adding 30-40% of ore and 70-90% of lime into the converter, carrying out secondary lance position control, secondary oxygen supply intensity control and secondary bottom blowing gas supply intensity control in the process, controlling the content of manganese in molten iron to be within 0.2%, controlling the temperature in the converter to be 1550-; (3) RH vacuum refining is carried out, the oxygen blowing amount is controlled to be 0.28-1.43Nm3/t, slag is splashed after tapping is finished, and the slag is poured into a slag pot to prepare for next furnace smelting. The method for smelting the electromagnetic pure iron by the converter double-slag method can be used for smelting pure iron with high purity, and has the advantages of simple process, low production cost and wide application prospect.
Description
Technical Field
The invention relates to the technical field of metallurgy, in particular to a method for smelting electromagnetic pure iron by a converter double-slag method.
Background
The electromagnetic pure iron is high-quality steel with the iron content of more than 99.5 percent, is low-carbon, low-sulfur and low-phosphorus iron (national standard GB6983-2008 electromagnetic pure iron), has the characteristics of low coercive force, high magnetic conductivity and stable magnetism, has excellent processing performance and wide application, and is an indispensable functional material in the scientific and technological industry. The classification is as follows: the iron core is made of pure iron, soft magnetic pure iron, pure iron for a magnetic powder clutch, pure iron for an electronic lock, electrician pure iron for an automobile piston, a pure iron belt for magnetic shielding, an aeronautical instrument, military pure iron, a pure iron medium plate for a galvanized pot, a pure iron thin plate for an electronic component, a pure iron for an electromagnetic valve and a magnetic separator, pure iron without hairline, pure iron for an electronic tube and electrician pure iron easy to turn.
The common methods for smelting electromagnetic pure iron in the converter reported at present include a single slag method, a slag retention method, a double slag method, BRP and the like. The single slag method is to make primary slag as the name implies, the slag is not poured in the process, and the direct smelting is finished; the slag remaining method is that the slag of the previous furnace is not completely poured out, and a part of the slag is left in the furnace for slagging of the next furnace; the double-slag method is that two times of slag are produced by a converter, one time of slag is poured in the smelting process, and the other time of slag is poured after the smelting is finished; BRP means that the converter produces steel twice, after the first steel production is finished, slag in the converter is poured, molten steel is filled into the converter, and slagging and steelmaking are carried out again.
The patent with the application number of CN201410049397.3 discloses a method for manufacturing electromagnetic pure iron, which mainly comprises the steps of converter, RH vacuum refining, die casting, forging, electroslag remelting and hot rolling to manufacture the electromagnetic pure iron, wherein a single slag method is adopted for smelting, the components of molten steel comprise less than or equal to 0.005 percent of C, less than or equal to 0.03 percent of Si, 0.08-0.13 percent of Mn, less than or equal to 0.015 percent of P and less than or equal to 0.008 percent of S, and the contents of carbon, manganese, phosphorus and sulfur in the molten steel are higher; the patent with the application number of CN201710829001.0 discloses a smelting method for producing electromagnetic pure iron, which mainly comprises the steps of EBT smelting (electric furnace), VOD refining, LF refining and VD refining, wherein the contents of C in molten steel are less than or equal to 0.008%, Si is less than or equal to 0.022%, P is less than or equal to 0.003%, S is less than or equal to 0.004%, N is less than or equal to 0.006%, and O is less than or equal to 0.003%. Therefore, how to further reduce the content of impurities such as carbon, manganese, phosphorus, sulfur, nitrogen, oxygen and the like in the molten steel to obtain electromagnetic pure iron with higher purity is a problem to be solved at present.
Disclosure of Invention
Aiming at the technical problems, the invention provides a method for smelting electromagnetic pure iron by a converter double-slag method, which can realize smelting of high-purity electromagnetic pure iron and has the advantages of simple production process and low production cost.
Therefore, the technical scheme provided by the invention is as follows:
a method for smelting electromagnetic pure iron by a converter double-slag method comprises the following steps:
(1) adding the pre-desulfurized molten iron into a converter, adding 60-70% of ore and 10% -30% of lime to form slag with the alkalinity of 3.5-5, and pouring out the generated slag by carrying out one-time gun position control, one-time oxygen supply intensity control and one-time bottom blowing air supply intensity control in the process, wherein the slag pouring amount is 20-50% of the total slag amount in the converter;
(2) continuously adding 30-40% of ore and 70-90% of lime into the converter after deslagging, and carrying out secondary lance position control, secondary oxygen supply intensity control and secondary bottom blowing air supply intensity control in the process, wherein the content of manganese in molten iron is controlled within 0.2%, the temperature in the converter is controlled to be 1550-;
(3) RH vacuum refining is carried out, and the oxygen blowing amount is controlled to be 0.28-1.43Nm 3/t. And splashing slag after tapping of the converter is finished, pouring slag in the converter into a slag pot after the slag is splashed, and preparing for smelting in the next furnace.
Preferably, the primary gun position control blow gun position is H ═ (47-49) dLarynxAfter ignition is successful, the gun position is H ═ 43-51 dLarynxIn the formula: h is the height of the nozzle from the liquid level of the molten pool, dLarynx: diameter of oxygen lance nozzle throat, H and dLarynxIn mm.
Preferably, the primary oxygen supply intensity is controlled such that the oxygen supply intensity after ignition is K ═ Nm3/(t.min) (2.86 to 3.24) and the oxygen supply intensity after ignition is successful is K ═ Nm3/(t.min) (2.38 to 2.86).
Preferably, the intensity of the primary bottom-blowing gas supply is controlled to be (0.076 to 0.143) Nm 3/(t.min).
Preferably, the secondary gun position is controlled to be H ═ 38-56) dLarynx: h ═ 47-56) d at the early and middle smelting stageLarynxIn the later stage of smelting, H ═ 41-45 dLarynxAt the end of smelting, H ═ 38-41 dLarynxIn the formula: h is the height of the nozzle from the liquid level of the molten pool, dLarynx: diameter of oxygen lance nozzle throat, H and dLarynxIn mm.
Preferably, the secondary oxygen supply intensity is controlled such that K ═ Nm3/(t.min) (2.62 to 3.24): the former stage and the middle stage of smelting are K ═ 2.62-2.86 Nm3/(t.min), the later stage of smelting is K ═ 2.86-3.10 Nm3/(t.min), and the last stage of smelting is K ═ 3.10-3.24 Nm 3/(t.min).
Preferably, the secondary bottom-blowing air supply intensity controls the bottom-blowing air supply intensity to be Q ═ Nm3/(t.min) (0.038 to 0.095): the early stage and the middle stage of the smelting are Q ═ Nm3/(t.min) (0.038-0.048), the later stage of the smelting is Q ═ Nm3/(t.min) (0.048-0.076), and the last stage of the smelting is Q ═ Nm3/(t.min) (0.076-0.095).
Compared with the prior art, the invention has the beneficial effects that:
the method for smelting the electromagnetic pure iron by the converter double-slag method provided by the invention produces the high-purity electromagnetic pure iron by using the converter double-slag method smelting and the RH vacuum refining process, and the double-slag method adopts partial residual slag in the first deslagging process. The method realizes smelting of the high-purity electromagnetic pure iron, and the impurity components and the contents of C in the molten steel are less than or equal to 0.002 percent, Si is less than or equal to 0.003 percent, Mn is less than or equal to 0.04 percent, P is less than or equal to 0.006 percent, S is less than or equal to 0.003 percent, N is less than or equal to 0.002 percent, O is less than or equal to 0.002 percent, the purity is better, the process is simple, the production cost is low, the method has universal practicability and has better application prospect in production.
Detailed Description
The following further describes specific embodiments of the present invention, and these examples are for detailed description of the present invention and are not intended to limit the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
In this embodiment, a converter with a capacity of 350 tons adopts a double-slag smelting method to smelt the electromagnetic pure iron, and the specific method is as follows:
(1) feeding materials into molten iron once, and adding 6378kg of ore and 2002kg of lime, wherein the temperature of the molten iron is 1369 ℃, the silicon content in the molten iron is 0.09%, and the manganese content in the molten iron is 0.15%. Controlling the position of a primary blow gun to be 2.5m, and controlling the position of the primary blow gun to be 2.5m after ignition is successful; controlling the oxygen supply intensity of the primary blowing to be 3.09Nm3/(t.min), and controlling the oxygen supply intensity to be 2.62Nm3/(t.min) after ignition is successful; the air supply intensity of the primary bottom blowing is controlled to be 0.076Nm 3/(t.min). And (4) pouring out the generated slag after the primary smelting is finished, wherein the primary slag pouring amount is 4 tons.
(2) The converter after deslagging was charged again with 1337kg of ore and 7772kg of lime. Controlling the lance position in the middle stage before and after the secondary smelting to be 2.7m, the lance position in the later stage to be 2.4m and the lance position in the last stage to be 2.0 m; controlling the middle-period oxygen supply intensity to be 2.62Nm3/(t.min) before the secondary smelting, the later-period oxygen supply intensity to be 2.86Nm3/(t.min), and the final-period oxygen supply intensity to be 3.23Nm 3/(t.min); the bottom blowing gas supply intensity in the middle stage before the secondary smelting is controlled to be 0.038Nm3/(t.min), the bottom blowing gas supply intensity in the later stage is controlled to be 0.057Nm3/(t.min), and the bottom blowing gas supply intensity in the last stage is controlled to be 0.076Nm 3/(t.min). The dynamic temperature is 1586 ℃, the dynamic carbon is 0.1 percent, the dynamic ore is 1.43kg, the blowing stopping temperature is 1612 ℃, and the blowing stopping carbon is 0.0437 percent.
(3) RH vacuum refining was carried out while controlling the oxygen blowing rate at 1.06Nm 3/t. And splashing slag after tapping of the converter is finished, pouring slag in the converter into a slag pot after the slag is splashed, and preparing for smelting in the next furnace.
Example 2
In this embodiment, a converter with a capacity of 350 tons adopts a double-slag smelting method to smelt the electromagnetic pure iron, and the specific method is as follows:
(1) feeding 3710kg of ore and 1486kg of lime into molten iron at a primary feeding temperature of 1374 ℃, wherein the silicon content in the molten iron is 0.27 percent, and the manganese content in the molten iron is 0.166 percent. Controlling the position of a primary blow gun to be 2.6m, and controlling the position of the primary blow gun to be 2.6m after ignition is successful; controlling the oxygen supply intensity of the primary blowing to be 3.10Nm3/(t.min), and controlling the oxygen supply intensity to be 2.62Nm3/(t.min) after the ignition is successful; the air supply intensity of the primary bottom blowing is controlled to be 0.076Nm 3/(t.min). And pouring out the generated slag after the primary smelting is finished, wherein the primary slag pouring amount is 4 tons.
(2) And continuously feeding materials into the converter after deslagging for the second time, and feeding 1573kg of ores and 65689kg of lime. Controlling the lance position in the middle stage before and after the secondary smelting to be 2.6m, the lance position in the later stage to be 2.3m and the lance position in the last stage to be 2.0 m; controlling the middle-period oxygen supply intensity to be 2.62Nm3/(t.min) before the secondary smelting, the later-period oxygen supply intensity to be 2.86Nm3/(t.min), and the final-period oxygen supply intensity to be 3.23Nm 3/(t.min); the bottom blowing gas supply intensity in the middle stage before the secondary smelting is controlled to be 0.038Nm3/(t.min), the bottom blowing gas supply intensity in the later stage is controlled to be 0.048Nm3/(t.min), and the bottom blowing gas supply intensity in the last stage is controlled to be 0.076Nm 3/(t.min). The dynamic temperature is 1581 ℃, the dynamic carbon content is 0.1 percent, the dynamic ore content is 2.57kg, the blowing stopping temperature is 1611 ℃, and the blowing stopping carbon content is 0.0367 percent.
(3) RH vacuum refining was carried out while controlling the oxygen blowing rate at 1.03Nm 3/t. And splashing slag after tapping of the converter is finished, pouring slag in the converter into a slag pot after the slag is splashed, and preparing for smelting in the next furnace.
Comparative example 1
In the comparative example, the single slag method is adopted to smelt the electromagnetic pure iron on the converter with the capacity of 350 tons, and the specific method is as follows:
(1) 3726kg of ore and 11059kg of lime are put into molten iron, the temperature of the molten iron is 1307 ℃, the molten iron contains 0.23 percent of silicon and 0.250 percent of manganese. The position of the primary blow-on lance is controlled to be 2.6m, and after ignition is successful, the primary blow-on oxygen supply intensity is 3.10Nm 3/(t.min).
(2) 2984kg of lime is added in the smelting process, and the gun position before and in the middle period of the secondary smelting is controlled to be 2.6m, the gun position in the later period is controlled to be 2.3m, and the gun position in the last period is controlled to be 2.0 m; the oxygen supply intensity in the early and middle periods is 2.62Nm3/(t.min), the oxygen supply intensity in the later period is 2.85Nm3/(t.min), and the oxygen supply intensity in the final period is 3.23Nm 3/(t.min); the front middle bottom blowing air supply intensity is 0.038Nm3/(t.min), the rear bottom blowing air supply intensity is 0.057Nm3/(t.min), and the final bottom blowing air supply intensity is 0.076Nm 3/(t.min). The dynamic temperature is 1559 ℃, the dynamic carbon is 0.223 percent, the dynamic ore is 0kg, the blowing stopping temperature is 1619 ℃, and the blowing stopping carbon is 0.0786 percent.
(3) RH vacuum refining was carried out while controlling the oxygen blowing rate to 0.79Nm 3. And splashing slag after tapping of the converter is finished, pouring slag in the converter into a slag pot after the slag is splashed, and preparing for smelting in the next furnace.
In order to further illustrate the effects of the present invention, the components of the electromagnetically pure iron prepared by the methods provided in examples 1 to 2 and comparative example 1 were measured, and the results are shown in table 1.
TABLE 1 test results of pure electromagnetic iron composition
As can be seen from Table 1, compared with the conventional single slag method provided in comparative example 1, the method for smelting electromagnetic pure iron by the converter double slag method provided by the invention obtains high purity electromagnetic pure iron by smelting, and the method contains C as an impurity and the contents of C are less than or equal to 0.002%, Si is less than or equal to 0.003%, Mn is less than or equal to 0.04%, P is less than or equal to 0.006%, S is less than or equal to 0.003%, N is less than or equal to 0.002%, and O is less than or equal to 0.002%, and compared with the prior art, the impurity contents in the molten steel components disclosed in patent application CN201410049397.3 and patent application CN201710829001.0 are far lower. In addition, the invention is also suitable for producing the electromagnetic pure iron by converters with different tonnages in the actual production process, so the invention can be popularized to other steel mills for use and has better application prospect.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. A method for smelting electromagnetic pure iron by a converter double-slag method is characterized by comprising the following steps:
(1) adding the pre-desulfurized molten iron into a converter, adding 60-70% of ore and 10% -30% of lime to form slag with the alkalinity of 3.5-5, and pouring out the generated slag by carrying out one-time gun position control, one-time oxygen supply intensity control and one-time bottom blowing air supply intensity control in the process, wherein the slag pouring amount is 20-50% of the total slag amount in the converter;
(2) continuously adding 30-40% of ore and 70-90% of lime into the converter after deslagging, and carrying out secondary lance position control, secondary oxygen supply intensity control and secondary bottom blowing air supply intensity control in the process, wherein the content of manganese in molten iron is controlled within 0.2%, the temperature in the converter is controlled to be 1550-;
(3) RH vacuum refining is carried out, and the oxygen blowing amount is controlled to be 0.28-1.43Nm 3/t. And splashing slag after tapping of the converter is finished, pouring slag in the converter into a slag pot after the slag is splashed, and preparing for smelting in the next furnace.
2. The method for smelting electromagnetic pure iron by the converter double slag method according to claim 1, wherein the primary lance position controls the blowing lance position H ═ 47-49 dLarynxAfter ignition is successful, the gun position H is (43-51) dLarynxIn the formula: h is the height of the nozzle from the liquid level of the molten pool, dLarynx: diameter of oxygen lance nozzle throat, H and dLarynxIn mm.
3. The method for smelting electromagnetic pure iron by the converter double slag method according to claim 1, wherein the primary oxygen supply intensity is controlled to (2.86-3.24) Nm3/(t.min), and the oxygen supply intensity after ignition is successful is controlled to (2.38-2.86) Nm 3/(t.min).
4. The method for smelting electromagnetic pure iron by the converter double slag method according to claim 1, wherein the primary bottom-blowing gas supply intensity controls the bottom-blowing gas supply intensity Q ═ (0.076-0.143) Nm 3/(t.min).
5. The method for smelting electromagnetic pure iron by the converter double slag method according to claim 1, wherein the secondary lance position control lance position H ═ (38-56) dLarynxThe blast position H ═ 47-56) d at the early and middle stages of smeltingLarynxIn the later stage of smelting, H ═ 41-45 dLarynxAt the end of smelting, H ═ 38-41 dThe throat of the patient is provided with a throat,in the formula: h is the height of the nozzle from the liquid level of the molten pool, dLarynx: diameter of oxygen lance nozzle throat, H and dLarynxIn mm.
6. The method for smelting electromagnetic pure iron by the converter double slag method according to claim 1, wherein the oxygen supply intensity of the secondary oxygen supply is controlled to be K ═ 2.62-3.24 Nm3/(t.min), K ═ 2.62-2.86 Nm3/(t.min) in the early and middle smelting periods, K ═ 2.86-3.10 Nm3/(t.min) in the late smelting period, and K ═ 3.10-3.24 Nm3/(t.min) in the late smelting period.
7. The method for smelting electromagnetic pure iron by the converter double slag method according to claim 1, wherein the secondary bottom-blowing gas supply intensity controls the bottom-blowing gas supply intensity to be Q ═ (0.038-0.095) Nm3/(t.min), Q ═ (0.038-0.048) Nm3/(t.min) in the early and middle smelting periods, Q ═ (0.048-0.076) Nm3/(t.min) in the late smelting period, and Q ═ (0.076-0.095) Nm3/(t.min) in the end smelting period.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114959488A (en) * | 2022-06-16 | 2022-08-30 | 山西太钢不锈钢股份有限公司 | Industrial pure iron medium plate and production method thereof |
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| CN114959488A (en) * | 2022-06-16 | 2022-08-30 | 山西太钢不锈钢股份有限公司 | Industrial pure iron medium plate and production method thereof |
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