CN114058768A - Converter smelting method for improving converter scrap ratio - Google Patents
Converter smelting method for improving converter scrap ratio Download PDFInfo
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- CN114058768A CN114058768A CN202111208457.8A CN202111208457A CN114058768A CN 114058768 A CN114058768 A CN 114058768A CN 202111208457 A CN202111208457 A CN 202111208457A CN 114058768 A CN114058768 A CN 114058768A
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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
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/56—Manufacture of steel by other methods
- C21C5/562—Manufacture of steel by other methods starting from scrap
- C21C5/565—Preheating of scrap
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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Abstract
The invention particularly relates to a converter smelting method for improving the ratio of converter scrap steel, which belongs to the technical field of converter smelting and comprises the following steps: adding lime, a tundish residual refractory material, scrap steel and coke into a converter to obtain a mixture; carrying out oxygen blowing heating on the mixture to obtain hot scrap steel; adding molten iron into the converter to be mixed with the hot scrap steel, and then smelting in the converter to obtain molten steel; in the process of adding the steel scrap into the converter, lime, residual refractory materials in a tundish and coke are added at the same time in a pioneering manner, the coke is ignited by top-blown oxygen, the steel scrap is heated by chemical heat, and furnace burden plays a role in protecting a furnace lining; the scrap steel ratio of the converter is increased to 35-40%, and the service life of the furnace lining is not affected.
Description
Technical Field
The invention belongs to the technical field of converter smelting, and particularly relates to a converter smelting method for improving the ratio of converter scrap steel.
Background
With the increase of steel accumulation and steel scrap resources in China and the prominent advantage of steel scrap price, the steel scrap ratio is improved, the yield can be increased, the steel-making cost of the converter can be reduced, and the environmental pollution and the comprehensive energy consumption can be greatly reduced by improving the steel scrap ratio.
At present, in the smelting process, the scrap steel ratio is 18.8%, and the problem of insufficient heat commonly existing in the smelting process of converter equipment is a main factor for limiting the improvement of the scrap steel ratio; the common means for improving the scrap steel ratio are as follows: adding scrap steel (blast furnace casting yard) in the tapping process, adding and preheating scrap steel in a hot metal ladle, adding and preheating scrap steel in a scrap steel tank, adding and preheating scrap steel after a furnace, and the like.
The process flow for directly adding the scrap steel into the hot metal ladle comprises the following steps: after the hot metal ladle is charged into the converter, the scrap steel scrap is added → the blast furnace receives hot metal → (hot metal pretreatment) and is charged into the converter. The process needs to increase a certain amount of scrap steel adding equipment, and the adding amount of the scrap steel is limited by the capacity of a hot metal ladle and the tapping temperature, so that the scrap steel is required to be scrap steel. From the application effect, the dosage of the converter scrap steel can be increased by 2-5%. And a hot metal ladle roaster or a hot metal ladle cover is arranged on the basis of the process in some steel plants, so that a scrap preheating link and heat preservation measures are added, the scrap can be preheated to 600-900 ℃, and the use level of the converter scrap is further increased to 5-8%.
The process flow for preheating the steel scrap in the steel scrap groove comprises the following steps: air-permeable steel scrap → adding a steel scrap groove → preheating to 500-. Compared with the process of preheating the waste steel by arranging a special heating furnace, the process is simpler, but investment is needed for constructing the waste steel groove with the heating function, and the consumption of the waste steel can be increased by 5-6%. There is also the practice case of preheating the scrap steel in the rotary kiln, but the rotary kiln can preheat a large amount of scrap steel, but the scrap steel is required to be crushed, the equipment is huge, the investment is high, and the heat dissipation of the scrap steel is fast in the transportation process.
The technological process of preheating the steel ladle to the scrap steel comprises the following steps: qualified packing scrap steel → adding a ladle → a preheating device heats to 600-. Under the process condition, the steel scrap must be qualified packing steel scrap, argon must be blown for stirring, and the temperature of the steel scrap and molten steel after mixing must reach about 1540 ℃.
The process flow for preheating the scrap steel comprises the following steps: qualified scrap steel scraps → a bottom-open type charging bucket → a storage bin → preheating to 600-.
The process flow for adding the scrap steel in the converter tapping process is as follows: transporting the ladle car to a converter tapping position → converter tapping → adding a proper amount of scrap steel particles according to the tapping temperature → stirring by bottom blowing argon → hoisting to a ladle furnace (controlling the temperature of molten steel to be about 1540 ℃), which is a conventional converter scrap adding technology, and basically the scrap steel proportion reaches the 20% level.
From the application condition of the prior art, the improvement of the scrap steel ratio mostly requires equipment investment transformation, the physical mode is adopted to heat the scrap steel, the maximum value of the scrap steel ratio reaches 20 percent, and the method has clear and harsh requirements on the lumpiness, the surface cleanliness and the like of the scrap steel.
Disclosure of Invention
The invention aims to provide a converter smelting method for improving the ratio of converter scrap, which solves the problems of high investment for improving the ratio of scrap and strict requirements on the quality of the scrap due to insufficient smelting heat of the large ratio of the scrap at present.
The embodiment of the invention provides a converter smelting method for improving the ratio of converter scrap, which comprises the following steps:
adding lime, a tundish residual refractory material, scrap steel and coke into a converter to obtain a mixture;
carrying out oxygen blowing heating on the mixture to obtain hot scrap steel;
and adding molten iron into the converter to be mixed with the hot scrap steel, and then smelting in the converter to obtain molten steel.
Optionally, the lime is added in an amount of 5 Kg/ton steel to 20 Kg/ton steel, the residual refractory material in the tundish is added in an amount of 5 Kg/ton steel to 15 Kg/ton steel, the scrap steel is added in an amount of 350 Kg/ton steel to 400 Kg/ton steel, and the coke is added in an amount of 20 Kg/ton steel to 40 Kg/ton steel.
Optionally, the composition of the tundish residual refractory material comprises, by mass: 80-95% of MgO and SiO25 to 10 percent of CaO, 1 to 5 percent of CaO, and the balance of inevitable impurities.
Optionally, the particle size of the residual refractory material of the tundish is 10mm-40 mm.
Optionally, in the lime, the mass fraction of CaO is greater than 45%, and the mass fraction of S is less than 0.03%.
Optionally, the particle size of the lime is 20mm-40 mm.
Optionally, the coke has a particle size of 10mm to 20 mm.
Optionally, in the oxygen blowing heating, the amount of oxygen blown in is controlled to be 17Nm325 Nm/ton steel3Per ton of steel.
Optionally, the temperature of the hot scrap steel is above 600 ℃.
Optionally, the adding amount of the molten iron is 122t-146 t.
One or more technical solutions in the embodiments of the present invention have at least the following technical effects or advantages:
the converter smelting method for improving the ratio of converter scrap provided by the embodiment of the invention comprises the following steps: adding lime, a tundish residual refractory material, scrap steel and coke into a converter to obtain a mixture; carrying out oxygen blowing heating on the mixture to obtain hot scrap steel; adding molten iron into the converter to be mixed with the hot scrap steel, and then smelting in the converter to obtain molten steel; in the process of adding the steel scrap into the converter, lime, residual refractory materials in a tundish and coke are added at the same time in a pioneering manner, the coke is ignited by top-blown oxygen, the steel scrap is heated by chemical heat, and furnace burden plays a role in protecting a furnace lining; the scrap steel ratio of the converter is increased to 35-40%, and the service life of the furnace lining is not affected.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
Fig. 1 is a flow chart of a method provided by an embodiment of the invention.
Detailed Description
The present invention will be described in detail below with reference to specific embodiments and examples, and the advantages and various effects of the present invention will be more clearly apparent therefrom. It will be understood by those skilled in the art that these specific embodiments and examples are for the purpose of illustrating the invention and are not to be construed as limiting the invention.
Throughout the specification, unless otherwise specifically noted, terms used herein should be understood as having meanings as commonly used in the art. Accordingly, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. If there is a conflict, the present specification will control.
Unless otherwise specifically stated, various raw materials, reagents, instruments, equipment and the like used in the present invention are commercially available or can be prepared by existing methods.
In order to solve the technical problems, the general idea of the embodiment of the application is as follows:
according to an exemplary embodiment of the present invention, there is provided a converter smelting method for increasing a converter scrap ratio, the method including:
s1, adding lime, a tundish residual refractory material, scrap steel and coke into a converter to obtain a mixture;
specifically, after slag splashing protection of a converter, 5-20 kg/ton of lime steel and 5-15 kg/ton of tundish residual refractory material are added into the bottom of the converter, 350-400 kg/ton of scrap steel is added, and 20-40 kg/ton of coke steel is added.
The lime has the effects of protecting a furnace bottom furnace lining and slagging and dephosphorization of a converter, the addition amount of the lime is controlled to be 5-20 kg/ton steel so as to protect the furnace bottom furnace lining and simultaneously not influence the heat absorption and temperature rise of scrap steel, too large addition amount value can cause too much heat absorption and is not beneficial to temperature rise of the scrap steel, and too small value can increase the mechanical impact on the furnace bottom when the scrap steel is added and the oxidation erosion on the furnace bottom furnace lining when oxygen blowing is carried out for temperature rise.
The residual refractory material of the tundish has the functions of protecting a furnace bottom furnace lining and slagging by using MgO in the furnace bottom furnace lining, the addition amount of the residual refractory material of the tundish is controlled to be 5-15 kg/ton steel so as to protect the furnace bottom furnace lining and simultaneously not influence the heat absorption and temperature rise of waste steel, the MgO content in converter slag is controlled in a reasonable range, too large addition amount can cause too much heat absorption and is not beneficial to the temperature rise of the waste steel, the MgO content in the slag is increased, the slag is too thick and is not beneficial to slag melting, too small addition amount can increase the mechanical impact on the furnace bottom when the waste steel is added and the oxidative corrosion on the furnace bottom furnace lining when the slag is heated by oxygen blowing.
As an alternative embodiment, the residual refractory material of the tundish added should correspond to: MgO 80-95 wt%, SiO25-10% of CaO, 1-5% of CaO, and the balance of impurity components which do not influence the steelmaking process, wherein the granularity is 10-40 mm.
The reason for controlling the granularity of the residual refractory material of the tundish to be 10-40 mm is to facilitate processing and rapid slagging.
As an alternative embodiment, the lime added should correspond to: the mass fraction of CaO is more than 45%, the mass fraction of S is less than 0.03%, and the granularity is 20-40 mm.
The particle size of lime is controlled to be 20-40 mm, small-particle lime can be sucked into a flue to cause loss, large particles are not beneficial to slag melting, the applicant finds that unnecessary problems can be avoided by adopting the lime with the particle size under the condition that other operations are not adopted, and in other embodiments, the technical personnel in the art can also solve the problems which can occur by adopting other measures to realize the adoption of lime with other particle sizes, for example, a filter is arranged on the flue, so that the adoption of lime with smaller particle size can be realized.
As an optional implementation mode, the added coke has the granularity of 10-20 mm so as to ensure that the added coke can be fully combusted and heat is transferred to the waste steel.
S2, carrying out oxygen blowing heating on the mixture to obtain hot scrap steel;
specifically, oxygen is blown from the top-blown lance, and the amount of oxygen blown is controlled to be 17-25Nm3Per ton of steel, the amount of oxygen blown is measured relative to the finished steel, and the scrap is heated to a temperature of 600 ℃ or higher.
Controlling the amount of oxygen blown in to 17-25Nm3The blowing-in quantity is too large, so that resources are wasted, the lining is eroded, and the temperature of the scrap steel is not increased enough due to too small value.
And S3, adding molten iron into the converter to be mixed with the hot scrap steel, and then smelting in the converter to obtain molten steel.
Specifically, adding molten iron, wherein the adding amount of the molten iron is matched with that of the scrap steel, namely the adding amount of the molten iron is 122t-146t, and blowing again by using an oxygen lance.
The converter smelting method for increasing the converter scrap ratio according to the present application will be described in detail with reference to examples, comparative examples and experimental data.
Example 1
Smelting is carried out in a converter with nominal capacity of 210 t.
After the last slag splashing protection is finished, 2100Kg of lime with the granularity of 20-40 mm is added into the converter, 2000Kg of residual refractory material of the tundish with the granularity of 10-40 mm is added, and the mass percentages of the components are as follows: MgO: 88% of SiO2: 6%, CaO: 2 percent, and the balance of impurity components which do not influence the steelmaking process;
then 77t of scrap steel and 7.2t of coke are added, and the granularity is 10-20 mm;
then the oxygen lance is put down for oxygen blowing operation, and the oxygen lanceThe oxygen level is controlled at 2.0m and the amount of oxygen blown in is 20Nm3Lifting a gun after preheating of scrap steel, and adding 140t of molten iron into the furnace;
after the molten iron is added, the oxygen lance is put down again to start blowing, a certain amount of slag formers such as lime and the like are added in a small amount and multiple batches in the smelting process, the alkalinity of the converter end-point slag is controlled to be 3.7, the mass fraction of MgO in the slag is 8.2%, the mass fraction of carbon in the molten steel at the smelting end point is 0.043%, the mass fraction of phosphorus is 0.010%, the mass fraction of sulfur is 0.008%, and when the temperature is 1650 ℃, tapping operation is carried out;
the ratio of converter scrap is 35.5%, and the total oxygen blowing amount is 10370Nm3And the smelting time of the converter is 40 min.
Example 2
Smelting in a converter with nominal capacity of 210 t.
After the last slag splashing protection is finished, 2600Kg of lime with the granularity of 20-40 mm is added into the converter, 3000Kg of the residual refractory material of the tundish with the granularity of 10-40 mm is added, and the weight percentages of the components are as follows: MgO: 86% of SiO2: 6%, CaO: 3 percent, and the balance of impurity components which do not influence the steelmaking process;
then 82t of scrap steel and 8.0t of coke are added, and the granularity is 10-20 mm;
then the oxygen lance is put down for oxygen blowing operation, the lance position of the oxygen lance is controlled at 2.0m, and the amount of blown oxygen is 24Nm3Lifting a gun after preheating of scrap steel, and then adding 136t of molten iron into the furnace;
after the molten iron is added, the oxygen lance is put down again to start blowing, a certain amount of slag formers such as lime and the like are added in a small amount and multiple batches in the smelting process, the alkalinity of the converter end-point slag is controlled to be 3.5, the mass fraction of MgO in the slag is 9.1%, the mass fraction of carbon in the molten steel at the smelting end point is 0.035%, the mass fraction of phosphorus is 0.008%, the mass fraction of sulfur is 0.010%, and when the temperature is 1660 ℃, tapping is carried out;
the steel scrap ratio of the converter is 37.6 percent, and the total oxygen blowing amount is 11420Nm3And the smelting time of the converter is 42 min.
Comparative example 1
Smelting is carried out in a converter with nominal capacity of 210 t.
After the last furnace is used for slag splashing and furnace protection, 35t of scrap steel is added, and then 183t of molten iron is added into the furnace;
after the molten iron is blended, blowing by an oxygen lance, adding a certain amount of slag formers such as lime, light burned dolomite and the like in a small amount and multiple batches in the smelting process, controlling the end-point slag alkalinity of the converter to be 3.6, controlling the mass fraction of MgO in the slag to be 9%, controlling the mass fraction of carbon in the molten steel at the end point of smelting to be 0.036%, controlling the mass fraction of phosphorus to be 0.009%, controlling the mass fraction of sulfur to be 0.011%, and tapping at the temperature of 1650 ℃;
the steel scrap ratio of the converter is 16.1 percent, and the total oxygen blowing amount is 8850Nm3The total smelting time is 38 min.
Comparative example 2
Smelting is carried out in a converter with nominal capacity of 210 t.
After the last slag splashing protection is finished, 800Kg of lime with the granularity of 20-40 mm is added into the converter, and 800Kg of residual refractory material of the tundish with the granularity of 10-40 mm is added, wherein the mass percentages of the components are as follows: MgO: 86% of SiO2: 6%, CaO: 3 percent, and the balance of impurity components which do not influence the steelmaking process;
then 82t of scrap steel and 3.0t of coke are added, and the granularity is 10-20 mm;
then the oxygen lance is put down for oxygen blowing operation, the lance position of the oxygen lance is controlled at 2.0m, and the amount of blown oxygen is 24Nm3Lifting a gun after preheating of scrap steel, and then adding 136t of molten iron into the furnace;
after the molten iron is added, the oxygen lance is put down again to start blowing, a certain amount of slag formers such as lime, light-burned dolomite and the like are added in a small amount and multiple batches in the smelting process, the end-point slag alkalinity of the converter is controlled to be 3.5, the mass fraction of MgO in the slag is 7.3%, the mass fraction of carbon in the molten steel at the end of smelting is 0.033%, the mass fraction of phosphorus is 0.010%, the mass fraction of sulfur is 0.018%, and when the temperature is 1660 ℃, tapping is carried out;
the steel scrap ratio of the converter is 37.6 percent, and the total oxygen blowing amount is 12184Nm3And the smelting time of the converter is 45 min.
Comparative example 3
Smelting in a converter with nominal capacity of 210 t.
After the previous slag splashing protection is finished, 6000Kg of lime with the granularity of 20-40 mm is added into the converter, 6500Kg of tundish residual refractory material with the granularity of 10-40 mm is added, and the mass percentages of the components are as follows: MgO: 86% of SiO2: 6%, CaO: 3 percent, and the balance of impurity components which do not influence the steelmaking process;
then 82t of scrap steel and 8.0t of coke are added, and the granularity is 10-20 mm;
then the oxygen lance is put down for oxygen blowing operation, the lance position of the oxygen lance is controlled at 2.0m, and the amount of blown oxygen is 24Nm3Lifting a gun after preheating of scrap steel, and then adding 136t of molten iron into the furnace;
after the molten iron is added, the oxygen lance is put down again to start blowing, a small amount of slag formers such as a certain amount of lime and the like are added in multiple batches in the smelting process, the alkalinity of the converter end-point slag is controlled to be 3.5, the mass fraction of MgO in the slag is 10.1%, the mass fraction of carbon in the molten steel at the smelting end point is 0.037%, the mass fraction of phosphorus is 0.011%, the mass fraction of sulfur is 0.019%, and the temperature is 1660 ℃, and tapping operation is carried out;
the steel scrap ratio of the converter is 37.6 percent, and the total oxygen blowing amount is 12439Nm3And the converter smelting time is 47 min.
The results of the experiments are shown in the following table:
from the above table, the method provided by the embodiment of the invention is adopted to carry out converter smelting, the scrap steel ratio can be increased to 35% -40%, the problem of insufficient smelting heat of large scrap steel ratio is solved, the comparison between the comparative example and the embodiment data can be used for obtaining the method, when the mixture ratio is not in the range provided by the embodiment of the invention, the comparative example 2 is analyzed, when the coke addition amount is too small, the chemical heat generated during scrap steel preheating is insufficient, the scrap steel temperature is insufficient, the temperature of molten iron entering the converter can be directly reduced, the oxygen blowing and temperature rising time and the oxygen blowing amount need to be prolonged, the smelting period of the converter is prolonged, the production rhythm is influenced, meanwhile, the refractory material addition amount is less, and the slagging process needs to additionally supplement more light-burned dolomite to increase the MgO content in slag, so that the cost is increased; analysis of comparative example 3 shows that when the amounts of lime and refractory added to the bottom of the converter are too large, the heating effect of the scrap steel can be affected due to the heat absorption of the lime and the refractory, and in addition, the slagging effect of the converter can be directly affected due to the excessive addition of the refractory, so that the smelting period of the whole converter is affected.
One or more technical solutions in the embodiments of the present invention at least have the following technical effects or advantages:
(1) according to the method provided by the embodiment of the invention, under the condition that equipment is not added, the waste steel is heated in a mode of burning coke to release heat, the ratio of the waste steel can be increased to 35% -40%, and the problem of insufficient heat for smelting large waste steel is solved;
(2) according to the method provided by the embodiment of the invention, lime and the residual refractory material in the tundish are paved at the bottom of the furnace after the last slag splashing protection is finished, so that the damage to the furnace lining caused by oxygen blowing during the preheating of the scrap steel is reduced;
(3) according to the method provided by the embodiment of the invention, the added tundish residual refractory material is used for increasing the MgO content in the slag while achieving the utilization of steelmaking solid waste, so that the converter slagging cost is reduced.
Finally, it should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A converter smelting method for improving the ratio of converter scrap steel is characterized by comprising the following steps:
adding lime, a tundish residual refractory material, scrap steel and coke into a converter to obtain a mixture;
carrying out oxygen blowing heating on the mixture to obtain hot scrap steel;
and adding molten iron into the converter to be mixed with the hot scrap steel, and then smelting in the converter to obtain molten steel.
2. The converter smelting method for increasing the steel scrap ratio of a converter according to claim 1, wherein the lime is added in an amount of 5 Kg/ton steel to 20 Kg/ton steel, the tundish residual refractory is added in an amount of 5 Kg/ton steel to 15 Kg/ton steel, the steel scrap is added in an amount of 350 Kg/ton steel to 400 Kg/ton steel, and the coke is added in an amount of 20 Kg/ton steel to 40 Kg/ton steel.
3. The converter smelting method for increasing the converter scrap ratio according to claim 1, wherein the composition of the tundish residual refractory comprises, in mass fraction: 80-95% of MgO and SiO25 to 10 percent of CaO, 1 to 5 percent of CaO, and the balance of inevitable impurities.
4. The converter smelting method for increasing the converter scrap ratio according to claim 1, wherein the grain size of the tundish residual refractory is 10mm to 40 mm.
5. The converter smelting method for increasing the converter scrap ratio according to claim 1, wherein the mass fraction of CaO in the lime is more than 45%, and the mass fraction of S in the lime is less than 0.03%.
6. The converter smelting method for increasing the converter scrap ratio according to claim 1, wherein the particle size of the lime is 20mm to 40 mm.
7. The converter smelting method for increasing the converter scrap ratio according to claim 1, wherein the particle size of the coke is 10mm to 20 mm.
8. The converter smelting method according to claim 1, wherein an amount of oxygen blown into the converter for heating with oxygen blowing is controlled to 17Nm325 Nm/ton steel3Per ton of steel.
9. The converter smelting method according to claim 1, wherein the temperature of the hot scrap is 600 ℃ or higher.
10. The converter smelting method for increasing the converter scrap ratio according to claim 1, wherein the addition amount of the molten iron is 122t to 146 t.
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| CN115161429A (en) * | 2022-07-27 | 2022-10-11 | 包头钢铁（集团）有限责任公司 | Method for calculating temperature and weight of hot-metal bottle added with scrap steel |
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