CN114369696A - Fluxing agent and use method thereof - Google Patents
Fluxing agent and use method thereof Download PDFInfo
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- CN114369696A CN114369696A CN202210044746.7A CN202210044746A CN114369696A CN 114369696 A CN114369696 A CN 114369696A CN 202210044746 A CN202210044746 A CN 202210044746A CN 114369696 A CN114369696 A CN 114369696A
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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
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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
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/064—Dephosphorising; Desulfurising
- C21C7/0645—Agents used for dephosphorising or desulfurising
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- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention discloses a fluxing agent and a use method thereof, wherein the fluxing agent is a powdery pressed ball, and has relatively stable physical and chemical indexes; after being added into the furnace, the fluxing agent is quickly decomposed into small particles in a high-temperature environment, the fluxing agent is prepared by briquetting and is a blocky fluxing agent, the lime content of the components of the fluxing agent is far higher than that of the existing slagging agent, and FeO and SiO2The components are matched, and the fluxing agent is added into the steelmaking slagging process, has high lime content, high activity and quick slagging, and prevents a high-melting-point compound C2And the formation of S greatly improves the melting speed of the slag, so that the dephosphorization effect in the converting process is obviously enhanced.
Description
Technical Field
The invention belongs to the technical field of converter steelmaking, and particularly relates to a fluxing agent and a using method thereof.
Background
The main task of converter smelting is highlighted in the aspect of dephosphorization. As is well known, the thermodynamic conditions for dephosphatation are low temperature, high alkalinity, large slag content, and suitable oxidizability. The slagging method of the existing converter smelting is mainly characterized in that different slagging materials such as lime and alumina are added in batches, but molten steel composition changes rapidly in the converter blowing process, so that the adjustment of the slag composition is difficult to adapt to the change of the molten steel composition, the phosphorus removal effect in the early stage is poor due to improper control in the actual operation process, the phosphorus return phenomenon in the middle and later stages affects the production rhythm, the consumption of slag materials is increased, waste products are possibly caused, and the rework time and the smelting cost are increased.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a fluxing agent and a using method thereof so as to solve the problems that the slagging process in the existing converter process is difficult to adapt to the requirement of molten steel dephosphorization and the dephosphorization effect is poor.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
a fluxing agent having a composition comprising, in mass percent: SiO22：2.89～2.99％；CaO：62.50～63.41％；MgO：5.61～5.63％；FeO：19.69～20.49％；Al2O3：1.56～1.57％；S：0.08～0.09％；MnO：0.80～0.82％；P2O5: 0.041-0.043% and rare earth elements: 0.006%; the balance being fluorite;
the fluxing agent is used in the converter steelmaking process.
The invention is further improved in that:
preferably, the flux is in bulk.
Preferably, the melting point of the fluxing agent is 1250-1300 ℃.
A method of using the flux of claim 1, comprising the steps of:
step 1, adding molten iron, scrap steel and slag charge into a converter;
step 2, blowing by an oxygen lance, wherein in the blowing process, open blowing is carried out for 20s, and a fluxing agent is added, wherein the adding amount of the fluxing agent is 1.5-2 kg/ton steel;
and 3, adjusting the lance position according to the flame in the middle and later stages of the blowing till the blowing is finished.
Preferably, after step 3, the addition amount of the fluxing agent is less than or equal to 1 kg/ton steel in the middle and later period of the blowing.
Preferably, in the step 2, when the fluxing agent is added, the gun position is a low gun position; after the fluxing agent is added, the oxygen lance is raised.
Preferably, in step 2, high calcium ash is added during the blowing process.
Preferably, in the step 3, the gun pressing operation is carried out for 30-40 s in the middle and later stages of the blowing.
Preferably, in the step 3, the ratio of the added slag former to the added fluxing agent is 4:1 during the blowing process.
Compared with the prior art, the invention has the following beneficial effects:
the invention discloses a cosolvent, which is a powdery pressed ball with relatively stable physical and chemical indexes; after being added into a furnace, the fluxing agent is quickly decomposed into small particles in a high-temperature environment, the fluxing agent is prepared by briquetting and is a blocky fluxing agent, the lime content of the component of the fluxing agent is far higher than that of the existing slagging agent and is matched with the components of FeO and SiO2, and the fluxing agent is added into the steelmaking slagging process, has high activity and quick slagging due to high lime content and prevents a high-melting-point compound C2The formation of S greatly improves the melting speed of the slag, so that the dephosphorization effect in the converting process is obviously enhanced; when a large amount of pig iron blocks are prepared in the scrap steel, after the scrap steel is melted in the middle stage of smelting, the Si contained in the scrap steel is oxidized to reduce the alkalinity of the slag, a large amount of iron oxide is consumed, and the slag is easily dried back after lime is supplemented, so that the phosphorus return phenomenon is caused; the super-effect fluxing agent can not be dried back while the alkalinity is improved, and the end point P can meet the tapping requirement. In addition, the operation stability of the oxygen lance can be improved, the larger blowing loss caused by the slag drying, the one-time converter turnover rate is improved, the smelting period is shortened, and the purposes of increasing the yield and reducing the consumption are achieved.
Furthermore, the addition of the fluxing agent can promote the accelerated formation of early-stage slag, and simultaneously can promote the alkalinity, shorten the oxygen supply time, reduce the blowing loss, improve the metal yield and reduce the consumption of the steel and iron materials of the converter.
Furthermore, the converter slagging process requires early dephosphorization and middle and later desulfurization, and the converter super flux has good effect.
Furthermore, the converter super-flux has a good fluxing effect on the whole slagging process of the converter, the whole converter slagging can be formed under good process operation conditions, early-stage slag formation, medium-stage slag penetration and later-stage slag thickening are realized, and the key effect of fully removing harmful gases in steel and reducing alloy consumption is realized.
The invention also discloses a using method of the cosolvent, the cosolvent is added in the early stage of converter blowing to help the formation of slag charge, and meanwhile, the cosolvent can be added in the middle and later stages of the converter blowing according to the slag melting condition to assist the whole converter blowing process.
Detailed Description
The present invention is described in further detail below with reference to specific examples:
aiming at the defects existing in the traditional experience steelmaking, according to the process characteristics of converter smelting, the slagging material and the fluxing agent are mixed according to a certain proportion, so that the melting speed of the slag is improved, the specific surface area of the interface reaction is increased, the drying-back phenomenon in the middle stage of smelting can be relieved, the decarburization speed is accelerated under the condition of ensuring dephosphorization, and the oxygen supply time is shortened. In addition, the product contains partial rare earth, the elements of the product have the functions of deoxidation and desulfurization, and the deformation capability of the rare earth inclusions can be changed by microalloying. Especially to a certain extent with brittle Al2O3Has the function of denaturation and can improve the fatigue performance of most steel grades.
The invention discloses a using method of a fluxing agent, which comprises the following components in percentage by mass: SiO22：2.89～2.99％；CaO：62.50～63.41％；MgO：5.61～5.63％；FeO：19.69～20.49％；Al2O3：1.56～1.57％；S：0.08～0.09％；MnO：0.80～0.82％；P2O5: 0.041-0.043%; rare earth elements: 0.006%, the balance fluorite, moreSpecifically, the rare earth element is cerium.
The fluxing agent is prepared by briquetting and is a block fluxing agent, the lime content of the components of the fluxing agent is far higher than that of the existing slagging agent, and the fluxing agent contains FeO and SiO2The components are matched, and a powdery pressing ball is prepared by pressing blocks and used as a converter steelmaking fluxing agent. The fluxing agent is added into the steelmaking slagging process, and the melting point of the fluxing agent is only 1250-. Rare earth cerium element is also added into the fluxing agent, and the performance of steel can be improved after the rare earth is added. Compared with the common fluxing agent, FeO and MnO are added into the fluxing agent, so that Mn elements in molten steel are not easy to reach slag in the steelmaking process, and further, the consumption of per ton of steel is reduced integrally.
One of the embodiments disclosed in the invention is that the use method of the fluxing agent disclosed in the invention specifically comprises the following steps:
step one, when the silicon content in the molten iron is less than 0.5%, the gun position is suitable for high and low operation, and the fluxing agent is added gradually according to the slagging condition. Adding fluxing agent gradually before and during smelting in the converter according to slagging conditions; in the whole smelting process, the adding amount of the fluxing agent is 2.5-3kg per ton of steel. The slag-making material comprises dolomite 3-8%, bauxite 8-13%, lime 65-80%, coarse aluminum 2-4%,
and step two, adding corresponding high-calcium ash and a small amount of fluxing agent in batches and in small batches according to the condition of the slag in the blowing process, wherein the lance position can be lower when the fluxing agent is added, the lance position can be higher after the fluxing agent is added, and the slag melting process is implemented by judging the travel of the lance position according to the flame to reduce the slag drying and control the occurrence of poor splashing. Blowing for 20 seconds, and adding 1.5-2kg of fluxing agent.
And step three, adding a fluxing agent, namely, rapidly forming slag, carefully watching flame, reducing the gun position in time and in a small range when the slag is melted, and adding high-calcium ash in small batches when necessary.
And step four, adjusting the lance positions in time according to flames in the middle and later stages of blowing, continuously adding a small amount of fluxing agent if slagging is slow, adding 1kg of fluxing agent in a small amount, and avoiding long-time lance hanging blowing as much as possible.
And fifthly, the gun pressing time is 30-40 seconds in the later gun position adjusting process, the uniform stirring effect is achieved, then the gun position is lifted to a proper gun position, the slag is further melted and slowly discharged from the gun, the gun position is lowered to carbon drawing, and the purpose of thickening the final slag is achieved.
And step six, the addition of high-calcium ash and high-magnesium ash is prohibited before the initial slag is not formed, a small amount of fluxing agent can be added, and the subsequent high-calcium ash is added in small batches for multiple times after slagging.
Example 1
The composition of the flux in this example is shown in table 1 below:
TABLE 1 fluxing agent composition of example 1
The use process of the fluxing agent comprises the following steps:
step 1, when the silicon content in the molten iron is less than 0.5%, the gun position is suitable for high-low operation. Adding fluxing agent gradually before and during smelting in the converter according to slagging conditions; in the whole smelting process, the adding amount of the fluxing agent is 3kg per ton of steel. The slag-making material comprises 8 percent of dolomite, 10 percent of bauxite, 75 percent of lime and 2 to 4 percent of coarse aluminum,
and secondly, adding corresponding high-calcium ash and a small amount of fluxing agent in batches according to the condition of the slag in the blowing process, wherein the lance position can be lower when the fluxing agent is added, the lance position can be higher after the fluxing agent is added, and the slag melting process is implemented by judging the travel of the lance position according to the flame to reduce the slag drying and control the occurrence of poor splashing. After 20 seconds of blowing, 1.8kg of flux was added.
And step three, adding a fluxing agent, namely, rapidly forming slag, carefully watching flame, reducing the gun position in time and in a small range when the slag is melted, and adding high-calcium ash in small batches when necessary.
And step four, adjusting the lance positions in time according to flames in the middle and later stages of blowing, continuously adding a small amount of fluxing agent if slagging is slow, adding 1kg of fluxing agent in a small amount, and avoiding long-time lance hanging blowing as much as possible.
The fluxing agent is added, so that the operation stability of the oxygen lance can be improved, the large blowing loss caused by slag drying is reduced, the one-time converter turnover rate is improved, the smelting period is shortened, and the purposes of increasing the yield and reducing the consumption are achieved.
Blowing was carried out using the fluxing agent of this example added to a converter, and the results are shown in Table 1 below
Table 1 comparative analysis of the 24-furnace flux data to the 32-furnace data for the same period is as follows:
by process tracking and above data analysis:
1. consumption of the flux: under the condition that molten iron silicon is basically leveled, the average amount of lime in a single furnace is reduced by 489kg, the amount of high-magnesium lime is reduced by 135kg, the amount of limestone is reduced by 568kg, the reduced lime is about 284kg, the total amount of the single furnace flux is reduced by 908kg, and the amount of steel per ton is reduced by 6.5 kg/t.
2. Consumption of steel materials: the average reduction of iron-containing materials of a single furnace of the test furnace is 369kg (2.6kg/t), the addition of 250kg of fluxing agent after the firing by blowing, the early-stage slag formation is faster, the process operation is stable, the splashing is obviously reduced, and the steel and iron material consumption of the test furnace with the addition of the fluxing agent (maximum 490kg and minimum 112kg) is reduced by 4.5kg/t compared with the non-added furnace.
3. Adding and mixing method and process of fluxing agent: the addition of the fluxing agent is mainly added in the early stage, 300kg is added after blowing for 20 seconds, 150kg is added to the rest part in a small amount according to the slagging condition in the process, and the slagging starts in 1 minute and 20 seconds in the early stage, so that the slagging is earlier than the slagging in the next time without the fluxing agent.
4. End-point phosphorus and rephosphorization: the end point phosphorus of the added fluxing agent is reduced by 0.001 percent compared with the end point phosphorus of the non-added furnace, the rephosphorization amount is increased by 0.002 percent (mainly, the added slag is less, the alkalinity is low), and the accumulated phosphorus of the furnace finished products of the added fluxing agent is increased by 0.001 percent compared with the non-added furnace.
5. Analysis of slag
The furnace number alkalinity of the added fluxing agent is 2.79, the furnace number alkalinity is not 3.15, the alkalinity is reduced by 0.36, the iron bead amount in the slag tracked by the technical personnel process is obviously reduced, the total iron is 14.8 percent, and the furnace number is reduced by 0.8 percent compared with the furnace number without the fluxing agent.
Third, cost control case
1. The consumption of the steel material is reduced by 4.5kg/t, and the cost is reduced by 4.5 x 2.8-12.6 yuan/t.
2. The lime consumption is reduced by 6.5kg/t, and the cost is reduced by 6.5X 0.39-2.53 Yuan/t.
3. The unit consumption of the fluxing agent is 367kg, the unit consumption of each ton of steel is 2.64kg, and the cost is increased by 7.95 yuan/t.
The total cost is reduced by 12.6+2.53-7.95 Yuan/t (7.18 Yuan/t).
By combining the analysis, the operation of the converter using the fluxing agent is obviously improved, the early-stage slagging is early, the process control is stable, the splashing is obviously reduced, the surface of the final slag sample is smooth, the iron bead amount in the slag is obviously reduced, the alkalinity is reduced and stable, the reduction of total iron in the slag and the reduction of total slag charge play a positive role in reducing the consumption of iron and steel materials, and the comprehensive smelting cost of the steelmaking converter is reduced by 7.18 yuan/t through accounting.
Example 2
TABLE 1 fluxing agent composition of example 2
The use process of the fluxing agent comprises the following steps:
step 1, when the silicon content in the molten iron is less than 0.5%, the gun position is suitable for high-low operation. Adding fluxing agent gradually before and during smelting in the converter according to slagging conditions; in the whole smelting process, the adding amount of the fluxing agent is 3kg per ton of steel. The slag-making material comprises 8 percent of dolomite, 10 percent of bauxite, 75 percent of lime and 3 percent of coarse aluminum,
and secondly, adding corresponding high-calcium ash and a small amount of fluxing agent in batches according to the condition of the slag in the blowing process, wherein the lance position can be lower when the fluxing agent is added, the lance position can be higher after the fluxing agent is added, and the slag melting process is implemented by judging the travel of the lance position according to the flame to reduce the slag drying and control the occurrence of poor splashing. After 20 seconds of blowing, 1.5kg of flux was added.
And step three, adding a fluxing agent, namely, rapidly forming slag, carefully watching flame, reducing the gun position in time and in a small range when the slag is melted, and adding high-calcium ash in small batches when necessary.
And step four, adjusting the lance positions in time according to flames in the middle and later stages of blowing, continuously adding a small amount of fluxing agent if slagging is slow, adding 1kg of fluxing agent in a small amount, and avoiding long-time lance hanging blowing as much as possible.
Example 3
TABLE 1 fluxing agent composition of example 2
The use process of the fluxing agent comprises the following steps:
step 1, when the silicon content in the molten iron is less than 0.5%, the gun position is suitable for high-low operation. Adding fluxing agent gradually before and during smelting in the converter according to slagging conditions; in the whole smelting process, the adding amount of the fluxing agent is 3kg per ton of steel. The slag-making material comprises dolomite 5%, bauxite 13%, lime 65%, coarse aluminum 2%,
and secondly, adding corresponding high-calcium ash and a small amount of fluxing agent in batches according to the condition of the slag in the blowing process, wherein the lance position can be lower when the fluxing agent is added, the lance position can be higher after the fluxing agent is added, and the slag melting process is implemented by judging the travel of the lance position according to the flame to reduce the slag drying and control the occurrence of poor splashing. After 20 seconds of blowing, 2kg of flux was added.
And step three, adding a fluxing agent, namely, rapidly forming slag, carefully watching flame, reducing the gun position in time and in a small range when the slag is melted, and adding high-calcium ash in small batches when necessary.
And step four, adjusting the lance positions in time according to flames in the middle and later stages of blowing, continuously adding a small amount of fluxing agent if slagging is slow, and adding 0.5kg of fluxing agent in a small amount, so as to avoid long-time lance hanging blowing as much as possible.
Example 4
TABLE 1 fluxing agent composition of example 2
The use process of the fluxing agent comprises the following steps:
step 1, when the silicon content in the molten iron is less than 0.5%, the gun position is suitable for high-low operation. Adding fluxing agent gradually before and during smelting in the converter according to slagging conditions; in the whole smelting process, the adding amount of the fluxing agent is 3kg per ton of steel. The slag-making material comprises dolomite 3%, bauxite 13%, lime 80%, coarse aluminum 4%,
and secondly, adding corresponding high-calcium ash and a small amount of fluxing agent in batches according to the condition of the slag in the blowing process, wherein the lance position can be lower when the fluxing agent is added, the lance position can be higher after the fluxing agent is added, and the slag melting process is implemented by judging the travel of the lance position according to the flame to reduce the slag drying and control the occurrence of poor splashing. After 20 seconds of blowing, 1.8kg of flux was added.
And step three, adding a fluxing agent, namely, rapidly forming slag, carefully watching flame, reducing the gun position in time and in a small range when the slag is melted, and adding high-calcium ash in small batches when necessary.
And step four, adjusting the lance positions in time according to flames in the middle and later stages of blowing, continuously adding a small amount of fluxing agent if slagging is slow, adding 1kg of fluxing agent in a small amount, and avoiding long-time lance hanging blowing as much as possible.
Example 5
TABLE 1 fluxing agent composition of example 2
The use process of the fluxing agent comprises the following steps:
step 1, when the silicon content in the molten iron is less than 0.5%, the gun position is suitable for high-low operation. Adding fluxing agent gradually before and during smelting in the converter according to slagging conditions; in the whole smelting process, the adding amount of the fluxing agent is 3kg per ton of steel. The slag-making material comprises dolomite 6%, bauxite 8%, lime 70%, coarse aluminum 2%,
and secondly, adding corresponding high-calcium ash and a small amount of fluxing agent in batches according to the condition of the slag in the blowing process, wherein the lance position can be lower when the fluxing agent is added, the lance position can be higher after the fluxing agent is added, and the slag melting process is implemented by judging the travel of the lance position according to the flame to reduce the slag drying and control the occurrence of poor splashing. After 20 seconds of blowing, 1.7kg of flux was added.
And step three, adding a fluxing agent, namely, rapidly forming slag, carefully watching flame, reducing the gun position in time and in a small range when the slag is melted, and adding high-calcium ash in small batches when necessary.
And step four, adjusting the lance positions in time according to flames in the middle and later stages of blowing, continuously adding a small amount of fluxing agent if slagging is slow, adding 1kg of fluxing agent in a small amount, and avoiding long-time lance hanging blowing as much as possible.
Example 6
TABLE 1 fluxing agent composition of example 2
The use process of the fluxing agent comprises the following steps:
step 1, when the silicon content in the molten iron is less than 0.5%, the gun position is suitable for high-low operation. Adding fluxing agent gradually before and during smelting in the converter according to slagging conditions; in the whole smelting process, the adding amount of the fluxing agent is 3kg per ton of steel. The slag-making material comprises 3 percent of dolomite, 13 percent of bauxite, 65 percent of lime and 4 percent of coarse aluminum,
and secondly, adding corresponding high-calcium ash and a small amount of fluxing agent in batches according to the condition of the slag in the blowing process, wherein the lance position can be lower when the fluxing agent is added, the lance position can be higher after the fluxing agent is added, and the slag melting process is implemented by judging the travel of the lance position according to the flame to reduce the slag drying and control the occurrence of poor splashing. After 20 seconds of blowing, 1.9kg of flux was added.
And step three, adding a fluxing agent, namely, rapidly forming slag, carefully watching flame, reducing the gun position in time and in a small range when the slag is melted, and adding high-calcium ash in small batches when necessary.
And step four, adjusting the lance positions in time according to flames in the middle and later stages of blowing, continuously adding a small amount of fluxing agent if slagging is slow, adding 1kg of fluxing agent in a small amount, and avoiding long-time lance hanging blowing as much as possible.
Example 7
TABLE 1 fluxing agent composition of example 2
The use process of the fluxing agent comprises the following steps:
step 1, when the silicon content in the molten iron is less than 0.5%, the gun position is suitable for high-low operation. Adding fluxing agent gradually before and during smelting in the converter according to slagging conditions; in the whole smelting process, the adding amount of the fluxing agent is 3kg per ton of steel. The slag-making material comprises dolomite 4%, bauxite 8%, lime 75%, coarse aluminum 4%,
and secondly, adding corresponding high-calcium ash and a small amount of fluxing agent in batches according to the condition of the slag in the blowing process, wherein the lance position can be lower when the fluxing agent is added, the lance position can be higher after the fluxing agent is added, and the slag melting process is implemented by judging the travel of the lance position according to the flame to reduce the slag drying and control the occurrence of poor splashing. After 20 seconds of blowing, 2kg of flux was added.
And step three, adding a fluxing agent, namely, rapidly forming slag, carefully watching flame, reducing the gun position in time and in a small range when the slag is melted, and adding high-calcium ash in small batches when necessary.
And step four, adjusting the lance positions in time according to flames in the middle and later stages of blowing, continuously adding a small amount of fluxing agent if slagging is slow, adding 1kg of fluxing agent in a small amount, and avoiding long-time lance hanging blowing as much as possible.
Example 8
TABLE 1 fluxing agent composition of example 2
The use process of the fluxing agent comprises the following steps:
step 1, when the silicon content in the molten iron is less than 0.5%, the gun position is suitable for high-low operation. Adding fluxing agent gradually before and during smelting in the converter according to slagging conditions; in the whole smelting process, the adding amount of the fluxing agent is 3kg per ton of steel. The slag-making material comprises 8 percent of dolomite, 10 percent of bauxite, 75 percent of lime and 3 percent of coarse aluminum,
and secondly, adding corresponding high-calcium ash and a small amount of fluxing agent in batches according to the condition of the slag in the blowing process, wherein the lance position can be lower when the fluxing agent is added, the lance position can be higher after the fluxing agent is added, and the slag melting process is implemented by judging the travel of the lance position according to the flame to reduce the slag drying and control the occurrence of poor splashing. After 20 seconds of blowing, 1.6kg of flux was added.
And step three, adding a fluxing agent, namely, rapidly forming slag, carefully watching flame, reducing the gun position in time and in a small range when the slag is melted, and adding high-calcium ash in small batches when necessary.
And step four, adjusting the lance positions in time according to flames in the middle and later stages of blowing, continuously adding a small amount of fluxing agent if slagging is slow, adding 1kg of fluxing agent in a small amount, and avoiding long-time lance hanging blowing as much as possible.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (9)
1. A fluxing agent, characterized in that the composition of the fluxing agent comprises, in mass fraction: SiO22：2.89～2.99％；CaO：62.50～63.41％；MgO：5.61～5.63％；FeO：19.69～20.49％；Al2O3：1.56～1.57％；S：0.08～0.09％；MnO：0.80～0.82％；P2O5: 0.041-0.043% and rare earth elements: 0.006%; the balance being fluorite;
the fluxing agent is used in the converter steelmaking process.
2. The flux according to claim 1, characterized in that the flux is bulk.
3. The fluxing agent of claim 1, wherein the melting point of the fluxing agent is 1250 ℃ to 1300 ℃.
4. A method of using the flux of claim 1, comprising the steps of:
step 1, adding molten iron, scrap steel and slag charge into a converter;
step 2, blowing by an oxygen lance, wherein in the blowing process, open blowing is carried out for 20s, and a fluxing agent is added, wherein the adding amount of the fluxing agent is 1.5-2 kg/ton steel;
and 3, adjusting the lance position according to the flame in the middle and later stages of the blowing till the blowing is finished.
5. The use method of the flux according to claim 4, wherein the flux is added in an amount of 1 kg/ton steel or less at the middle and later stages of blowing after the step 3.
6. The use method of the flux according to claim 4, wherein in the step 2, when the flux is added, the gun position is a low gun position; after the fluxing agent is added, the oxygen lance is raised.
7. The use method of the fluxing agent according to claim 4, wherein in the step 2, high calcium ash is added during the blowing.
8. The use method of the flux according to claim 4, wherein in the step 3, the lance pressing operation is performed for 30-40 s at the middle and later stages of the blowing.
9. The use method of the fluxing agent according to claim 3, wherein in the step 3, the ratio of the slagging agent to the fluxing agent added during the blowing process is 4: 1.
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| CN115341056A (en) * | 2022-08-22 | 2022-11-15 | 河北濡春新能源集团有限公司 | Rare earth nano metallurgy smelting agent |
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