CN112522475B - Method for improving desulfurization efficiency in converter - Google Patents
Method for improving desulfurization efficiency in converter Download PDFInfo
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- CN112522475B CN112522475B CN202011252525.6A CN202011252525A CN112522475B CN 112522475 B CN112522475 B CN 112522475B CN 202011252525 A CN202011252525 A CN 202011252525A CN 112522475 B CN112522475 B CN 112522475B
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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
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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
- C21C1/00—Refining of pig-iron; Cast iron
- C21C1/02—Dephosphorising or desulfurising
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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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- 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 provides a method for improving the desulfurization efficiency in a converter, which is characterized by comprising the following steps: obtaining the contents of sulfur and heating elements in molten iron; determining the usage ratio of the bottom material to the steel material according to the contents of the sulfur element and the heating element in the molten iron; the steel material comprises molten iron and scrap steel which are mixed according to a preset proportion, and the bottom material comprises raw dolomite and lime according to a weight ratio of 0.8-1; after the operation of slag splashing and furnace protection is carried out on the converter, adding the basic charge with corresponding weight at the bottom of the converter according to the total charging amount of the converter and the usage ratio of the basic charge to the steel charge; pouring the steel material with corresponding weight into the converter; performing blowing operation, and sequentially adding at least one batch of slag formers into the converter in the blowing process; and performing the operation of furnace turning and steel tapping. The invention can improve the desulfurization efficiency in the converter, reduce the loss and cost of converter steelmaking and facilitate standardized operation.
Description
Technical Field
The invention relates to the technical field of steel smelting, in particular to a method for improving the desulfurization efficiency in a converter.
Background
The converter steelmaking uses molten iron, scrap steel and the like as main raw materials, does not need external energy, and completes the steelmaking process in the converter by means of heat generated by physical heat of molten iron and chemical reaction among molten iron components.
In the above-mentioned main raw materials, the fluctuation of the sulfur element composition in molten iron is large, and in the high case, it is 0.080% to 0.090%, and even higher. When the existing converter steelmaking method is adopted, when the sulfur content in molten iron reaches more than 0.060%, the phenomenon of low desulfurization efficiency in the converter is obvious, and under the condition, the desulfurization efficiency in the converter can be improved only by serious after-blowing, but the serious after-blowing can cause great loss of a furnace lining and iron and steel materials, and the smelting cost is greatly increased along with the serious after-blowing.
In view of the above, there is a need to provide a method for improving the desulfurization efficiency in a converter, which solves or at least alleviates the above technical drawbacks.
Disclosure of Invention
The invention mainly aims to provide a method for improving the desulfurization efficiency in a converter, and aims to solve the technical problems of low desulfurization efficiency, high loss and high cost in the prior art.
In order to achieve the above object, the present invention provides a method for improving desulfurization efficiency in a converter, comprising:
obtaining the contents of sulfur and heating elements in molten iron;
determining the usage ratio of the bottom material to the steel material according to the contents of the sulfur element and the heating element in the molten iron; the steel material comprises molten iron and scrap steel which are mixed according to a preset proportion, and the bottom material comprises raw dolomite and lime according to a weight ratio of 0.8-1;
after the operation of slag splashing and furnace protection is carried out on the converter, adding the basic charge with corresponding weight at the bottom of the converter according to the total charging amount of the converter and the usage ratio of the basic charge to the steel charge;
pouring the steel material with corresponding weight into the converter;
performing blowing operation, and sequentially adding at least one batch of slag formers into the converter in the blowing process;
and performing the operation of furnace turning and steel tapping.
Further, the heat generating element includes one or more of silicon, manganese, carbon, and phosphorus.
Further, the method also comprises the following steps: and determining the proportion of the molten iron and the scrap steel in the steel material according to the content of the heating element in the molten iron, the first furnace reversing temperature and the tapping temperature.
Further, the weight ratio of the base material to the steel material is 2.6-3.
Further, the performing of the blowing operation, before the step of sequentially adding at least one batch of slag former into the converter of the converter during the blowing process, further includes:
obtaining the melting state of the backing material;
and when the bottom material is completely melted, adding the slagging agent into the converter for the first time.
Further, the slagging agent comprises lime, and the weight ratio of the total weight of the lime to the steel material in at least one batch of the slagging agent is 1.5-2: 85.
further, the blowing process comprises the following steps: and the lance position of the oxygen lance is a high lance position during blowing, the lance position is reduced in the blowing process, the lance position is reduced again in the final stage of blowing, and blowing is stopped when the required end point carbon range is reached in blowing.
Further, the step of lowering the lance again at the end of the converting includes: and before blowing is stopped, maintaining the gun pressing time of the lowest gun position in the converter for not less than 60 seconds.
Further, the step of determining the endpoint char range comprises: and observing the flame at the furnace mouth.
Further, the step of performing the operation of turning down the furnace and tapping comprises:
after the primary converter turning and before tapping, determining whether to perform reblowing according to the temperature and the component content of the sample in the primary converter turning result;
when the complementary blowing is needed, after the complementary blowing is executed, the furnace reversing and the sampling are carried out again, and whether the complementary blowing is carried out or not is determined according to the temperature and the component content of the sample in the furnace reversing result again;
when the after-blow is not needed, tapping is directly carried out.
Compared with the prior art, the invention has the following advantages:
1. the invention can improve the desulfurization efficiency in the converter, in the invention, the lime is used as a part of the bottom material in the converter by adjusting the converter steelmaking process, a certain amount of raw dolomite is mixed in the bottom material, and the bottom material is added into the converter before the steel material is added, so that the characteristics of low decomposition temperature and carbon dioxide gas release of raw Bai Danre are utilized, good dynamic and thermodynamic conditions are provided for desulfurization in the early stage of smelting, the desulfurization time in the converter is advanced, the desulfurization speed in the converter is accelerated while the desulfurization time in the whole converter is prolonged, the desulfurization efficiency in the converter is improved to more than 50% from about 30% in the prior stage, and when the content of sulfur element in molten iron is not more than 0.080%, the steel can be discharged from the converter once, and remedial measures such as after-blowing and the like are not needed.
2. Can reduce the loss and cost of converter steelmaking, and in the invention, the raw dolomite (the main component MgCO) 3 ) Low thermal decomposition temperatureBecause the thermal decomposition temperature is about 530 ℃, the thermal decomposition can be realized under the action of the impact of the molten iron, and CO is released 2 Gas, CO 2 The gas can play a good role in stirring, CO 2 The gas reacts with C in the molten iron to generate 2 times of CO, and the stirring effect is stronger; in the invention, the bottom material is fully contacted with the molten iron under the impact of the molten iron, so that the reaction interface of S and CaO is greatly increased; in the invention, the addition of the base material can form initial slag which has good fluidity and alkalinity of 2.0-2.5 and is beneficial to desulfurization reaction in the furnace as soon as possible. On the basis of the theory, the raw dolomite and the lime are mixed according to a specific proportion to be used as the base material, and the base material is poured into the converter before the steel material is poured, so that the desulfurization efficiency in the converter is obviously improved, the desulfurization efficiency can be improved by serious back blowing, and the condition that the lining and the steel material are greatly lost due to low desulfurization efficiency can be avoided.
3. The converter steelmaking operation for improving the desulfurization efficiency in the converter can be conveniently carried out by operators according to an exact standard by determining the components and the proportion of the bed charge and the steel material; in addition, the adding time and adding sequence of the base materials are clarified, and the aim of improving the desulfurization efficiency in the converter can be achieved by workers according to the method in the invention in the operation process of converter steelmaking.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a schematic flow chart of a method for improving desulfurization efficiency in a converter according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive efforts based on the embodiments of the present invention, are within the scope of protection of the present invention.
It should be noted that all the directional indicators (such as upper and lower … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the figure), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, the descriptions related to "first", "second", etc. in the present invention are only for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature.
Moreover, the technical solutions in the embodiments of the present invention may be combined with each other, but it is necessary to be able to be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent, and is not within the protection scope of the present invention.
The invention provides a method for improving the desulfurization efficiency in a converter, which comprises the following steps:
and S1, obtaining the contents of sulfur and heating elements in molten iron, and providing a reference basis for the proportion of various additives such as subsequent bottom materials, steel materials and the like.
S2, determining the dosage ratio of the bottom material to the steel material according to the contents of the sulfur element and the heating element in the molten iron; the steel material comprises molten iron and scrap steel which are mixed according to a preset proportion, and the bottom material comprises raw dolomite and lime according to a weight ratio of 0.8-1; the raw dolomite and the lime are mixed according to the characteristic proportion to prepare the bottom material, and the characteristics of low decomposition temperature and carbon dioxide gas release of the raw Bai Danre are utilized, so that the reaction interface of S and the lime is increased, namely the reaction interface of S and CaO is increased, and the desulfurization efficiency is improved.
S3, after the converter is subjected to slag splashing protection operation, adding the basic charge with corresponding weight at the bottom of the converter according to the total charging amount of the converter and the usage ratio of the basic charge to the steel charge; the lime is used as a part of the bottom materials in the furnace, and a certain amount of raw dolomite is mixed in the bottom materials, so that the characteristics of low decomposition temperature and carbon dioxide gas release of raw Bai Danre are utilized, good dynamic and thermodynamic conditions are provided for desulfurization in the early stage of smelting, the desulfurization time in the furnace is advanced, the desulfurization time in the whole furnace is prolonged, and the desulfurization rate in the furnace is accelerated.
S4, pouring the steel material with the corresponding weight into the converter; and pouring the steel material with the corresponding weight after the bottom material is added, so that the bottom material is positioned at the bottom of the furnace, and the reaction of S and CaO is accelerated under the drive of carbon dioxide generated by thermal decomposition of the raw dolomite.
And S5, performing blowing operation, and sequentially adding at least one batch of slag former into the converter of the converter in the blowing process to reduce impurities in the steel.
And S6, performing the operation of furnace turning and steel tapping.
By adopting the method for improving the desulfurization efficiency in the converter to carry out steel making in the embodiment, the desulfurization efficiency in the converter is improved to more than 50% from about 30% in the past, and when the content of sulfur element in molten iron is not more than 0.080%, the steel can be tapped from the converter once, remedial measures such as after-blowing and the like are not needed, and the expected purpose of rapid and efficient desulfurization is achieved.
The specific mechanism of action of the above embodiment is: first, the raw dolomite (main component MgCO) 3 ) Low thermal decomposition temperature (about 530 deg.C) under the impact of molten ironCan realize thermal decomposition and release CO 2 Gas, CO 2 The gas can play a good role in stirring, CO 2 The gas reacts with C in the molten iron to generate 2 times of CO, and the stirring effect is stronger. And secondly, the bottom material is fully contacted with the molten iron under the impact of the molten iron, so that the reaction interface of S and CaO is greatly increased. Moreover, the addition of the base material can form initial slag which has good fluidity and alkalinity of 2.0-2.5 and is beneficial to desulfurization reaction in the furnace as soon as possible. In conclusion, the raw dolomite and the lime are mixed according to the characteristic proportion to be used as the base material, and the base material is poured into the converter before the steel material is poured, so that good dynamic and thermodynamic conditions are created for the steelmaking and desulfurization of the converter.
Specifically described as the above embodiment, the heating element includes one or more of a silicon element, a manganese element, a carbon element, and a phosphorus element, and a reference can be provided for the mixture ratio of the primer and the steel material by measuring the content of the one or more of the heating elements.
Further, the proportion of the molten iron and the scrap steel in the steel material can be determined according to the content of the heating element in the molten iron, the first furnace reversing temperature and the tapping temperature. As for multiple comparison screening according to various parameters, preferably, according to multiple comparison screening of the content of sulfur element and the content of heating element in molten iron, the weight ratio of the bottom material to the steel material is 2.6-3; and according to the comparison and screening of the content of heating elements in molten iron, the first-time converter-tilting temperature and the tapping temperature for multiple times, the weight ratio of the molten iron to the scrap steel in the steel material is 14.
In addition, the performing of the converting operation, before the step of sequentially adding at least one batch of slag former into the converter during the converting, further includes: obtaining the melting state of the backing material; and when the bottom materials are completely melted, the slagging agent is added into the converter for the first time, so that the desulfurization time is shortened and the desulfurization efficiency is improved.
The slag-forming agents commonly used in the field are various, lime is one of the slag-forming agents, and when the slag-forming agent commonly used in the field is selected, the slag-forming agent comprises the lime in order to correspond to the components in the base material; in order to apply the method for improving the desulfurization efficiency in the converter to industry in a standardized manner, through multiple comparison analysis, preferably, the ratio of the lime to the steel material is as follows: the weight ratio of the total weight of the lime in the slagging agent of at least one batch to the steel material is 1.5-2: 85, and the alkalinity of the final slag is adjusted to 3.0 to 3.3.
In order to ensure the normal development of the steelmaking step and the steelmaking success rate, the converting process comprises the following steps: and the lance position of the oxygen lance is a high lance position during blowing, the lance position is reduced in the blowing process, the lance position is reduced again in the final stage of blowing, and blowing is stopped when the required end point carbon range is reached in blowing. Specifically, the step of determining the endpoint char range comprises: and observing the flame at the furnace mouth. In order to achieve uniform temperature and components in the furnace, the step of lowering the lance again in the last stage of converting comprises the following steps: and before blowing is stopped, maintaining the gun pressing time of the lowest gun position in the converter for not less than 60 seconds.
Further, in order to improve the quality of the discharged steel, the step of performing the operation of turning down the furnace and tapping comprises the following steps: after the primary converter turning and before tapping, determining whether to perform reblowing according to the temperature and the component content of the sample in the primary converter turning result; when the complementary blowing is needed, after the complementary blowing is executed, the furnace reversing and the sampling are carried out again, and whether the complementary blowing is carried out or not is determined according to the temperature and the component content of the sample in the furnace reversing result again; when the after-blow is not needed, tapping is directly carried out.
To specifically explain the present invention, the method for improving the desulfurization efficiency in the converter will be further illustrated with reference to the following specific examples.
Example 1
A method of increasing the efficiency of desulfurization in a converter furnace comprising:
obtaining the contents of sulfur and heating elements in molten iron; the heating element comprises one or more of silicon element, manganese element, carbon element and phosphorus element.
And determining the using ratio of the bottom material to the steel material according to the contents of the sulfur element and the heating element in the molten iron, wherein the amount of the bottom material is 2.6 tons, and the amount of the steel material is 85 tons, wherein the bottom material comprises 0.8 ton of raw dolomite and 1.8 ton of lime.
And determining the proportion of molten iron and steel scraps in the steel material according to the content of heating elements in the molten iron, the first converter tilting temperature and the tapping temperature, wherein the amount of the molten iron is 70 tons, and the amount of the steel scraps is 15 tons.
After the slag splashing protection operation of the converter, 2.6 tons of the bottom charge was added to the bottom of the converter.
After the bottom materials are added, 85 tons of the steel materials are poured into the converter;
and performing blowing operation, acquiring the melting state of the basic material in the blowing process, and sequentially adding at least one batch of slag former into the converter when the basic material is completely melted, wherein the slag former comprises lime, and the total amount of the lime in the at least one batch of slag former is 1.5 tons.
In the blowing process, the lance position of an oxygen lance is a high lance position during blowing, the lance position is reduced in the blowing process, the lance position is reduced again in the last stage of blowing, before blowing is stopped, the lance pressing time of the lowest lance position in the converter is maintained for not less than 60 seconds, blowing is stopped when the required end point carbon range is reached, and the end point carbon range is determined by observing the flame at the furnace mouth and the like.
Performing furnace reversing and tapping operation, and after primary furnace reversing and before tapping, determining whether to perform reblowing according to the temperature and the component content of the sample in the primary furnace reversing result; when the complementary blowing is needed, after the complementary blowing is executed, the furnace reversing and the sampling are carried out again, and whether the complementary blowing is carried out or not is determined according to the temperature and the component content of the sample in the furnace reversing result again; when the after-blow is not needed, tapping is directly carried out.
In the converter steelmaking process, the in-furnace desulfurization efficiency of the converter reaches 51 percent, and the situations of needing to adopt after-blowing and the like due to incomplete desulfurization are not generated.
Example 2
A method for improving the desulfurization efficiency in a converter furnace comprises the following steps:
obtaining the contents of sulfur and heating elements in molten iron; the heating element comprises one or more of silicon element, manganese element, carbon element and phosphorus element.
And determining the using ratio of the bottom material to the steel material according to the contents of the sulfur element and the heating element in the molten iron, wherein the amount of the bottom material is 3 tons, and the amount of the steel material is 85 tons, wherein the bottom material comprises 1 ton of raw dolomite and 2 tons of lime.
And determining the proportion of molten iron and scrap steel in the steel material according to the content of heating elements in the molten iron, the first furnace-turning temperature and the tapping temperature, wherein the amount of the molten iron is 70 tons, and the amount of the scrap steel is 15 tons.
And after the operation of slag splashing and furnace protection of the converter is carried out, 3 tons of the bottom materials are added into the converter bottom of the converter.
After the bottom materials are added, 85 tons of the steel materials are poured into the converter;
and performing blowing operation, acquiring the melting state of the basic material in the blowing process, and sequentially adding at least one batch of slag former into the converter when the basic material is completely melted, wherein the slag former comprises lime, and the total amount of the lime in the at least one batch of slag former is 2 tons.
In the blowing process, the lance position of an oxygen lance is a high lance position during blowing, the lance position is reduced in the blowing process, the lance position is reduced again in the last stage of blowing, before blowing is stopped, the lance pressing time of the lowest lance position in the converter is maintained for not less than 60 seconds, blowing is stopped when the required end point carbon range is reached, and the end point carbon range is determined by observing the flame at the furnace mouth and the like.
Performing furnace reversing and tapping operation, and after primary furnace reversing and before tapping, determining whether to perform reblowing according to the temperature and the component content of the sample in the primary furnace reversing result; when the complementary blowing is needed, after the complementary blowing is executed, the furnace reversing and the sampling are carried out again, and whether the complementary blowing is carried out or not is determined according to the temperature and the component content of the sample in the furnace reversing result again; when the after-blow is not needed, tapping is directly carried out.
In the converter steelmaking process, the in-furnace desulfurization efficiency of the converter reaches 55 percent, and the situations of needing to adopt after-blowing and the like due to incomplete desulfurization are not generated.
Example 3
A method for improving the desulfurization efficiency in a converter furnace comprises the following steps:
obtaining the contents of sulfur and heating elements in molten iron; the heating element comprises one or more of silicon element, manganese element, carbon element and phosphorus element.
And determining the using ratio of the bottom material to the steel material according to the contents of the sulfur element and the heating element in the molten iron, wherein the amount of the bottom material is 2.8 tons, and the amount of the steel material is 85 tons, wherein the bottom material comprises 0.9 ton of raw dolomite and 1.9 ton of lime.
And determining the proportion of molten iron and scrap steel in the steel material according to the content of heating elements in the molten iron, the first furnace-turning temperature and the tapping temperature, wherein the amount of the molten iron is 70 tons, and the amount of the scrap steel is 15 tons.
And after the operation of slag splashing and furnace protection of the converter is carried out, 2.8 tons of the bottom materials are added into the converter bottom of the converter.
After the bottom materials are added, 85 tons of the steel materials are poured into the converter;
and performing blowing operation, acquiring the melting state of the basic material in the blowing process, and sequentially adding at least one batch of slag former into the converter when the basic material is completely melted, wherein the slag former comprises lime, and the total amount of the lime in the at least one batch of slag former is 1.8 tons.
And in the blowing process, the lance position of the oxygen lance is a high lance position when blowing is started, the lance position is reduced in the blowing process, the lance position is reduced again in the last stage of blowing, before blowing is stopped, the lance pressing time of the lowest lance position in the converter is maintained for not less than 60 seconds, blowing is stopped when the required end point carbon range is reached in the blowing process, and the end point carbon range is determined by observing the flame at the furnace mouth and the like.
Performing furnace reversing and tapping operation, and after primary furnace reversing and before tapping, determining whether to perform reblowing according to the temperature and the component content of the sample in the primary furnace reversing result; when the complementary blowing is needed, after the complementary blowing is executed, the furnace reversing and the sampling are carried out again, and whether the complementary blowing is carried out or not is determined according to the temperature and the component content of the sample in the furnace reversing result again; when the after-blow is not needed, tapping is directly carried out.
In the converter steelmaking process, the in-furnace desulfurization efficiency of the converter reaches 52 percent, and the situations of needing to adopt after-blowing and the like due to incomplete desulfurization are not generated.
In the above technical solutions, the above are only preferred embodiments of the present invention, and the technical scope of the present invention is not limited thereby, and all the technical concepts of the present invention include the claims of the present invention, which are directly or indirectly applied to other related technical fields by using the equivalent structural changes made in the content of the description and the drawings of the present invention.
Claims (5)
1. A method for improving the desulfurization efficiency in a converter is characterized by comprising the following steps:
obtaining the contents of sulfur and heating elements in molten iron;
determining the usage ratio of the bottom material to the steel material according to the contents of the sulfur element and the heating element in the molten iron; the steel material comprises molten iron and waste steel which are mixed according to a preset proportion, and the primer is prepared from raw dolomite and lime according to a weight ratio of 0.8-1;
the weight ratio of the base material to the steel material is 2.6-3, and the weight ratio of the molten iron to the scrap steel in the steel material is 14;
after slag splashing protection operation is carried out on a converter, according to the total loading amount of the converter and the usage ratio of the primer to a steel material, adding the primer with corresponding weight at the bottom of the converter, wherein the primer forms initial slag with fluidity and alkalinity of 2.0-2.5 in the converter;
pouring the steel material with corresponding weight into the converter;
performing blowing operation, and sequentially adding at least one batch of slag former into the converter in the blowing process; in the process of converting, the method comprises the following steps: the high lance position is adopted as the lance position of the oxygen lance during blowing, the lance position is reduced in the blowing process, the lance position is reduced again in the last stage of blowing, and blowing is stopped when the required end point carbon range is reached in blowing; the step of descending the lance again at the end of converting comprises the following steps: before blowing stopping, maintaining the gun pressing time of the lowest gun position in the converter to be not less than 60 seconds;
and performing the operation of furnace turning and steel tapping.
2. The method of claim 1, wherein the blowing operation is performed, and the step of sequentially adding at least one batch of slag former into the converter during the blowing operation further comprises:
obtaining the melting state of the backing material;
and when the bottom material is completely melted, adding the slagging agent into the converter for the first time.
3. The method for improving the desulfurization efficiency in the converter furnace according to claim 1, wherein the slagging agent comprises lime, and the weight ratio of the total weight of the lime in at least one batch of the slagging agent to the steel material is 1.5 to 2:85.
4. the method of increasing the desulfurization efficiency in a converter according to claim 1, wherein the step of determining the end point carbon range comprises: the flame at the furnace mouth was observed.
5. The method for improving desulfurization efficiency in a converter according to claim 1, wherein the step of performing the converter tilting and tapping operation comprises:
after the primary converter turning and before tapping, determining whether to perform reblowing according to the temperature and the component content of the sample in the primary converter turning result;
when the complementary blowing is needed, after the complementary blowing is executed, the furnace reversing and the sampling are carried out again, and whether the complementary blowing is carried out or not is determined according to the temperature and the component content of the sample in the furnace reversing result again;
when the after-blow is not needed, steel is directly tapped.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105671237A (en) * | 2016-03-17 | 2016-06-15 | 武钢集团昆明钢铁股份有限公司 | Low-cost slagging and dephosphorizing technique for high-phosphorus molten iron through converter smelting |
| CN111876549A (en) * | 2020-07-01 | 2020-11-03 | 石横特钢集团有限公司 | Converter high-iron ratio smelting process |
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| CN111876549A (en) * | 2020-07-01 | 2020-11-03 | 石横特钢集团有限公司 | Converter high-iron ratio smelting process |
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