CN108034788B - Method for treating desulfurized iron slag - Google Patents
Method for treating desulfurized iron slag Download PDFInfo
- Publication number
- CN108034788B CN108034788B CN201711285601.1A CN201711285601A CN108034788B CN 108034788 B CN108034788 B CN 108034788B CN 201711285601 A CN201711285601 A CN 201711285601A CN 108034788 B CN108034788 B CN 108034788B
- Authority
- CN
- China
- Prior art keywords
- iron
- desulfurized
- slag
- blowing
- equal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/30—Regulating or controlling the blowing
- C21C5/34—Blowing through the bath
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The invention provides a method for treating desulfurized iron slag, which comprises the following steps: adding the desulfurized slag iron into molten iron in a converter for blowing to melt the desulfurized slag iron, wherein the weight of a single piece of desulfurized slag iron is less than or equal to 1500Kg, the thickness of the single piece of desulfurized slag iron is less than or equal to 300mm, and the length of the single piece of desulfurized slag iron is less than or equal to 1000 mm; the oxygen supply intensity of the converter is 1.9-3.5Nm3The total oxygen supply amount is 3000-3500 Nm3(ii) a The bottom blowing strength is 0.077-0.124 Nm3Min/t; and after the melting of the desulfurized slag iron is finished, tapping the semisteel. The method can stably consume the desulfurized slag iron, has large treatment capacity, can normally desulfurize under the condition of higher semisteel sulfur content, can normally smelt various steels by the semisteel molten iron after desulfurization, and has simple and practical process.
Description
Technical Field
The invention belongs to the technical field of steel making, and particularly relates to a method for treating desulfurized iron slag.
Background
China is a big country for steel production, and annual steel yield reaches 7 hundred million tons, which accounts for more than 50% of the quantity of steel plants in the world. It is known that the steel industry is a large energy consumer, so how to save energy and reduce emission is always one of the important works of steel enterprises. With the increasing demand for steel quality in the world, the hot metal desulfurization project has been opened in various steel mills, so more and more desulfurized iron slag is generated, the iron slag has high iron content, but the S content of the slag is very high and usually reaches more than 2%, and the molten steel is slightly mixed into a part of the iron slag, which seriously pollutes the molten steel. How to recycle the desulfurized iron slag is a difficult problem which needs to be solved urgently.
Some enterprises adopt a method for finely crushing the desulfurized slag iron, namely adding the desulfurized slag iron with small granularity into an iron ladle and melting the desulfurized slag iron by using stirring power in the blast furnace tapping process, but the method has the advantages of low iron consumption of desulfurized slag, capability of adding about 1t of molten iron in each ladle, and great limitation, and is mainly applied to enterprises implementing the process of one pot to one end.
Disclosure of Invention
In view of the above problems in the background art, the main object of the present invention is to provide a method for treating desulfurized iron slag, which can stably consume desulfurized iron slag, and has the advantages of large treatment capacity, simple and practical process, and wide applicability.
In order to achieve the purpose, the invention adopts the following technical scheme: a method of treating desulphurised iron slag, the method comprising:
adding the desulfurized slag iron into molten iron in a converter for blowing to melt the desulfurized slag iron, wherein the weight of a single piece of desulfurized slag iron is less than or equal to 1500Kg, the thickness of the single piece of desulfurized slag iron is less than or equal to 300mm, and the length of the single piece of desulfurized slag iron is less than or equal to 1000 mm;
the oxygen supply intensity of the converter is 1.9-3.5Nm3The total oxygen supply amount is 3000-3500 Nm3(ii) a The bottom blowing strength is 0.077-0.124 Nm3/min/t；
And after the melting of the desulfurized slag iron is finished, tapping the semisteel.
Preferably, the thickness of the desulfurized slag iron is 10mm-300mm, and the length of the desulfurized slag iron is 10mm-1000 mm.
More preferably, the oxygen flow rate at the time of the converter blow is 3 to 3.5Nm3Min/t, after confirming ignition, the oxygen supply intensity is adjusted to 1.9-2.0Nm3/min/t。
More preferably, when the weight of the desulfurization slag iron added into the converter is 35-45t and the molten iron is 185-195t, the loading amount of the converter is controlled at 225-235 t.
Further preferably, the oxygen supply time is 8 to 10 min.
Further preferably, the method further comprises: the carbon content of the desulfurized slag iron is more than or equal to 2.80 percent and less than or equal to 3.20 percent after the melting is finished, and the temperature of semi-steel tapping is controlled to be more than or equal to 1460 ℃ and less than or equal to 1520 ℃.
Further preferably, the method further comprises: adding 800-1500 kg of small-particle lime into molten iron at the beginning of semisteel tapping; and adding ferrosilicon after the small-particle lime is added, so that the content of Si in the molten iron is 0.23-0.34%.
As a further preference, the small-particle lime is added with the steel stream when tapping the converter until the tapping amount reaches 1/5-2/5.
The method further preferably comprises the steps of controlling online bottom blowing argon in the tapping process, controlling the flow rate to be 500-800 Nl/min, and stirring for 3-5min by bottom blowing after steel tapping, wherein the flow rate of bottom blowing is 800-1500N L/min.
Further preferably, the method further comprises: desulfurizing the semisteel molten iron obtained by tapping, wherein the desulfurization period is 60-70 min; the target sulfur content is 0.001-0.005%.
As a further preference, the desulfurization comprises: the desulfurizer powder is placed in a blowing tank, the desulfurizer powder in the blowing tank is conveyed to a spray gun through carrier gas, and then the desulfurizer is blown into the semi-steel water through the spray gun; the carrier gas flow rate 1-2min before blowing is 100-120Nm3H, setting the speed of the desulfurizer powder to be 7-10 kg/min; when the pressure of the blowing tank is less than or equal to 0.65Mpa, the speed of the desulfurizer powder is adjusted to 10-13 kg/min.
The invention has the beneficial effects that: the invention uses the desulfurized slag iron to replace scrap steel, melts the scrap steel in a converter by using molten iron and blowing, and performs tapping operation (semisteel) after the melting is finished; the weight (single weight for short) of a single block of the desulfurized slag iron is less than or equal to 1500Kg, the thickness is less than or equal to 300mm, and the length is less than or equal to 1000mm, namely the weight and the size of the desulfurized slag iron are controlled, so that the desulfurized slag iron can be rapidly melted in the molten iron of the converter; the invention then controls the oxygen supply intensity of the converter blowing to be 1.9-3.5Nm3The total oxygen supply amount is 3000-3500 Nm3(ii) a The bottom blowing strength is 0.077-0.124 Nm3Min/t; namely, the oxygen supply intensity and the bottom blowing intensity of the converter iron melting process are comprehensively controlled, and the complete melting of the desulfurized slag iron before tapping is ensured. The method can stably consume the desulfurized slag iron, has simple and practical process, can be used in the conventional converter steelmaking process, and has wide application.
Detailed Description
The invention solves the problem of how to effectively recycle the desulfurized iron slag by providing the method for treating the desulfurized iron slag.
In order to solve the above-mentioned defects, the main idea of the embodiment of the present invention is:
the method for treating the desulfurized iron slag provided by the embodiment of the invention comprises the following steps:
adding the desulfurized slag iron into molten iron of a converter for blowing and melting, and controlling the weight and the size of the desulfurized slag iron to ensure that the desulfurized slag iron can be quickly melted, wherein the weight of the desulfurized slag iron is less than or equal to 1500Kg, the thickness of the desulfurized slag iron is less than or equal to 300mm, and the length of the desulfurized slag iron is less than or equal to 1000 mm; the weight of the desulfurized iron slag can be controlled by a screening or crushing method, as long as the iron content of the desulfurized iron slag meets the requirement, the smaller the weight of the desulfurized iron slag is, the better the weight of the desulfurized iron slag is theoretically, so that the desulfurized iron slag is easier to melt in a converter, the lower limit size of the desulfurized iron slag can be controlled to be larger than 10mm in the application of the embodiment, and meanwhile, the weight of the desulfurized iron slag can be smaller than 1 Kg.
Then, during blowing, the oxygen supply intensity and the bottom blowing intensity of the converter iron-melting process are comprehensively controlled, in order to ensure successful ignition, the large oxygen flow of blowing is adopted for ignition, after the ignition is successful, the flow is changed to be small, and the blowing time is controlled within a certain time (for example, 8-10min) to ensure that the desulfurized slag iron is completely melted; the high bottom blowing strength is adopted, and the stirring is enhanced to improve the melting speed of the desulfurized slag iron. The oxygen supply intensity of the converter in the embodiment of the invention is 1.9-3.5Nm3The total oxygen supply amount is 3000-3500 Nm3(ii) a The bottom blowing strength is 0.077-0.124 Nm3/min/t；
And after the melting of the desulfurized slag iron is finished, tapping the semisteel.
In order to make the aforementioned and other objects, features, and advantages of the present invention comprehensible, several embodiments accompanied with the method for treating desulfurized iron slag according to the present invention are described below.
Example 1
Embodiment 1 of the present invention is a method for treating desulfurized iron slag, comprising: and adding the desulfurized slag iron into the molten iron of the converter for blowing to melt the desulfurized slag iron, and tapping the semisteel after the desulfurized slag iron is melted.
In order to ensure that the desulfurization slag iron is melted in a limited time, the weight of the desulfurization slag iron is controlled, so that the single weight of the desulfurization slag iron in the embodiment of the invention is 1000-1500 Kg;
in order to ensure that the desulfurized slag iron is melted in a limited time and meet the requirement on the size of the desulfurized slag iron, the specification and the size of the desulfurized slag iron in the embodiment of the invention meet the following requirements: the thickness is 100-300mm, and the length is 500-1000 mm;
in example 1, the oxygen blowing strength of the converter was 3.41Nm3Min/t, after confirming ignition, the oxygen supply intensity was 1.94Nm3Control at/min/t, total oxygen supply 3000Nm3(ii) a Bottom blowing Strength 0.077Nm3/min/t。
The converter loading amount is 230t, the molten iron amount is 190t, the heat balance and the maximum amount of the prepared desulfurized slag iron are comprehensively considered, the prepared amount of the desulfurized slag iron is controlled to be 40 t/furnace, and the molten iron amount can ensure that the requirements of continuously smelting variety steel can be met after the converter iron melting and the subsequent semisteel desulfurization are finished; theoretically, the amount of molten iron is equal to the charging amount, the amount of iron in the desulfurized slag and the tare weight of the foundry ladle.
The practical application proves that 40t of desulfurized slag iron in the converter is completely melted within 8 min.
Example 2
Embodiment 2 of the present invention is a method for treating desulfurized iron slag, comprising: and adding the desulfurized slag iron into the molten iron of the converter for blowing to melt the desulfurized slag iron, and tapping the semisteel after the desulfurized slag iron is melted. Adding slag charge in the tapping process, carrying out pre-desulfurization and combined desulfurization and slagging, carrying out semi-steel silicon blending operation, then feeding the semi-steel molten iron into a desulfurization station for treatment, and after the desulfurization treatment is finished, reloading into a converter for smelting and scrap steel.
The weight of the desulfurization iron slag in the embodiment of the invention is 100-500 Kg; the thickness is 50-100mm, and the length is 100-500 mm;
in example 2, the oxygen supply strength in the converter at the start of blowing was 3.0Nm3Min/t, after confirming ignition, the oxygen supply intensity was 1.9Nm3Control at/min/t, total oxygen supply 3500Nm3(ii) a Bottom blowing Strength 0.124Nm3/min/t。
Example 2 when the weight of the desulfurized slag iron charged into the converter was 45t and the molten iron was 195t, the charging amount of the converter was controlled to 235 t.
The practical application proves that 45t of desulfurized slag iron in the converter is completely melted within 10 min.
Embodiment 2 in order to ensure the subsequent composite desulfurization effect, the tapping carbon content and temperature are controlled: when the semi-steel tapping is carried out after the melting of the desulfurized slag iron is finished, the carbon content of the semi-steel tapping is controlled according to 2.80 percent, and the aim of controlling the melting of the desulfurized slag iron and the carbon content of the semi-steel tapping is fulfilled by controlling the total oxygen supply amount and the oxygen supply time of the semi-steel according to the calculation of a sublance model and daily actual production data; meanwhile, in order to ensure the subsequent composite desulfurization effect, the temperature drop of the feeding in the tapping process and the tapping process is considered, and the tapping temperature of the semisteel is controlled at 1460 ℃.
In addition, the sulfur content of the semisteel molten iron which is mixed with the desulfurized slag iron is considered comprehensively, and in order to relieve the pressure of composite desulfurization, the operation of adding small-particle lime and common ferrosilicon after the furnace is adopted in the embodiment 2. Adding slag charge in the tapping process, carrying out pre-desulfurization and slagging for composite desulfurization, namely: adding 1500kg of small-grain lime immediately after tapping, adding the mixed steel flow together, and finishing the adding before the tapping amount is 2/5; in order to ensure the heat balance of the smelting variety steel after the semisteel desulfurization is finished, the semisteel silicon preparation operation is carried out, namely 1000kg of common silicon iron (reference target Si: 0.34%) is added after the small-particle lime is added.
Meanwhile, in order to ensure that the added slag and alloy are melted, on-line bottom blowing argon is controlled in the tapping process, the flow is controlled according to 800Nl/min, and after steel is discharged, bottom blowing strong stirring is adopted for 3min, wherein the bottom blowing flow is 1000N L/min.
In the embodiment 2, the semisteel molten iron obtained by tapping is subjected to desulfurization treatment, and as the semisteel molten iron has high sulfur content, the composite desulfurization needs a sufficient period, and the embodiment 2 optimizes the blowing parameters: the desulfurization period of example 2 was 60min, which comprised: the desulfurizer powder is placed in a blowing tank, the desulfurizer powder in the blowing tank is conveyed to a spray gun through carrier gas, and then the desulfurizer is blown into the semi-steel water through the spray gun; the carrier gas flow rate in the early stage of blowing is 100Nm3Spraying at a powder speed of 7-10 kg/minAfter the pressure of the blowing tank is less than or equal to 0.65Mpa, the powder speed is adjusted to 10-13 kg/min; if the tank pressure tends to rise in the blowing process, the carrier gas flow is adjusted to 110-120 Nm3H, if the tank pressure is continuously increased, reducing the powder speed to 7-10 kg/min; the tank pressure is controlled to be less than or equal to 0.68MPa in the whole blowing process;
practical application proves that 45t of desulfurized slag iron is stably consumed by the method in the embodiment 2, meanwhile, the semisteel molten iron after desulfurization can be used for normally smelting steel, the desulfurization efficiency is high, and the final sulfur content is 0.005%.
Example 3
Example 3 of the present invention the method of treating desulphurized iron slag was similar to example 2.
The single weight of the desulfurization iron slag in embodiment 3 of the invention is 500-1000 Kg; the thickness is 100-200mm, and the length is 500-800 mm;
in example 3, the converter open-blown oxygen flow rate was 3.5Nm3Min/t, after confirming ignition, oxygen supply intensity was 2.0Nm3Min/t control, total oxygen supply 3200Nm3(ii) a Bottom blowing Strength 0.102Nm3/min/t。
Example 3 the charging amount of the converter was controlled to 225t when the weight of the desulfurized slag iron charged into the converter was 35t and the weight of the molten iron was 185 t.
The practical application proves that the 35t of desulfurized slag iron in the converter is completely melted within 9 min.
In order to ensure the subsequent composite desulfurization effect, when the semi-steel tapping is carried out after the desulfurization slag iron is molten, the carbon content of the semi-steel tapping is controlled according to 3.20 percent; and simultaneously, considering the temperature drop in the charging and tapping processes, and controlling the tapping temperature of the semi-steel to 1520 ℃.
In addition, the sulfur content of the semisteel molten iron which is matched with the desulfurized slag iron is considered comprehensively, in order to relieve the pressure of composite desulfurization, the slag charge is added in the tapping process in the embodiment 3, and pre-desulfurization and composite desulfurization slagging are carried out, namely: adding 1000kg of small-grain lime immediately after tapping, adding the mixed steel flow together, and finishing the adding before the tapping amount is 1/5; in order to ensure the heat balance of the smelting variety steel after the semisteel desulfurization is finished, the semisteel silicon preparation operation is carried out, namely 800kg of common silicon iron (reference target Si: 0.30%) is added after the small-particle lime is added.
Meanwhile, in order to ensure that the added slag and alloy are melted, on-line bottom blowing argon is controlled in the tapping process, the flow is controlled according to 600Nl/min, and after steel is discharged, bottom blowing strong stirring is adopted for 5min, wherein the bottom blowing flow is 1500N L/min.
In example 3, the semisteel molten iron obtained from tapping was further subjected to desulfurization treatment for a desulfurization period of 70 min. The desulfurization comprises the following steps: the desulfurizer powder is placed in a blowing tank, the desulfurizer powder in the blowing tank is conveyed to a spray gun through carrier gas, and then the desulfurizer is blown into the semi-steel water through the spray gun; the carrier gas flow rate is 100Nm in the early stage of blowing (1-2 min before starting blowing)3H, adjusting the powder speed to 13kg/min after the powder speed is 10kg/min and the pressure of the blowing tank is less than or equal to 0.65 Mpa; if the tank pressure tends to rise in the blowing process, the carrier gas flow is adjusted to 120Nm3H, if the tank pressure is continuously increased, reducing the powder speed to 10 kg/min; the tank pressure is controlled to be less than or equal to 0.68MPa in the whole blowing process.
In addition, in example 3, the slagging-off was standardized during the desulfurization treatment, that is, the following were carried out: when in slag removal, the principle of early slag removal and slag removal is followed, and for the iron slag which is thin and not easy to gather, the slag collecting agent is added and the air blowing is used for removing the slag to assist in slag removal. The semisteel molten iron after desulfurization can be used for normally smelting various steels.
In conclusion, in the embodiment 3 of the invention, the weight and the size of the desulfurized iron slag are controlled; controlling the charging amount of the iron melt in the converter; comprehensively controlling the oxygen supply intensity and the bottom blowing intensity of the converter iron melting process; finishing iron melting, and controlling carbon and temperature; steel tapping and feeding and ladle bottom blowing control; and (5) compound desulfurization control. Under the permission of production rhythm, 35t of desulfurized slag iron can be stably consumed, meanwhile, the semisteel molten iron after desulfurization can be used for normally smelting variety steel, and can be normally desulfurized under the condition of higher semisteel sulfur content, and the semisteel sulfur content is controlled to be 0.004%. The method has good practical application effect.
Example 4
Example 4 of the present invention the method of treating desulphurized iron slag was similar to example 3.
The single weight of the desulfurized iron slag in the embodiment 4 of the invention is 1-100 Kg; the thickness is 10-50mm, and the length is 10-100 mm;
in example 4, the converter open-blown oxygen flow rate was 3.0Nm3Min/t, after confirming ignition, the oxygen supply intensity was 1.9Nm3Control at/min/t, total oxygen supply 3000Nm3(ii) a Bottom blowing Strength 0.078Nm3/min/t。
In example 4, the charging amount of the converter was controlled to 225t when the weight of the desulfurized slag iron charged into the converter was 35t and the weight of the molten iron was 185 t.
The practical application proves that the 35t of desulfurized slag iron in the converter is completely melted within 8 min.
In order to ensure the subsequent composite desulfurization effect, when the semi-steel tapping is carried out after the desulfurization slag iron is molten, the carbon content of the semi-steel tapping is controlled according to 3.00 percent; meanwhile, the semi-steel tapping temperature is controlled at 1500 ℃ in consideration of the temperature drop in the processes of feeding and tapping.
In addition, the sulfur content of the semisteel molten iron which is matched with the desulfurized slag iron is considered comprehensively, in order to relieve the pressure of composite desulfurization, the slag charge is added in the tapping process in the embodiment 4, pre-desulfurization is carried out, and composite desulfurization slagging is carried out, namely: adding 800kg of small-particle lime immediately after tapping, adding the mixed steel flow together, and finishing the adding before the tapping amount is 1/5; in order to ensure the heat balance of the smelting variety steel after the semisteel desulfurization is finished, the semisteel silicon preparation operation is carried out, namely 700kg of common silicon iron (reference target Si: 0.23%) is added after the small-particle lime is added.
Meanwhile, in order to ensure that the added slag and alloy are melted, on-line bottom blowing argon is controlled in the tapping process, the flow is controlled according to 500Nl/min, and after steel is discharged, bottom blowing strong stirring is adopted for 5min, wherein the bottom blowing flow is 1000N L/min.
Example 4 the semisteel molten iron obtained from tapping was also subjected to a desulfurization treatment with a desulfurization period of 60 min. The carrier gas flow rate is 100Nm in the early stage of blowing (1-2 min before starting blowing)3H, the powder speed is 7kg/min, and the powder speed is adjusted to 10kg/min after the pressure of the blowing tank is less than or equal to 0.65 Mpa; if the tank pressure tends to rise in the blowing process, the carrier gas flow is adjusted to 110Nm3H, if the tank pressure is continuously increased, reducing the powder speed to 7 kg/min; the tank pressure is controlled to be less than or equal to 0.68MPa in the whole blowing process.
In addition, in order to ensure the subsequent composite desulfurization effect, the step and the parameters of the example 4 are similar to those of the example 3, and finally, the sulfur content of the semisteel is controlled to be 0.001 percent.
The technical scheme in the embodiment of the application at least has the following technical effects or advantages:
the invention uses the desulfurized slag iron to replace scrap steel, melts the scrap steel in a converter by using molten iron and blowing, and performs tapping operation (semisteel) after the melting is finished; the weight of the desulfurized iron slag is less than or equal to 1500Kg, the thickness of the desulfurized iron slag is less than or equal to 300mm, and the length of the desulfurized iron slag is less than or equal to 1000mm, namely the weight and the size of the desulfurized iron slag are controlled, so that the desulfurized iron slag can be rapidly melted in the molten iron of the converter; the invention then controls the oxygen supply intensity of the converter blowing to be 1.9-3.5Nm3The total oxygen supply amount is 3000-3500 Nm3(ii) a The bottom blowing strength is 0.077-0.124 Nm3Min/t; namely, the oxygen supply intensity and the bottom blowing intensity of the converter iron melting process are comprehensively controlled, and the complete melting of the desulfurized slag iron before tapping is ensured. The method can stably consume the desulfurized slag iron, has simple and practical process, can be used in the conventional converter steelmaking process, and has wide application.
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 (4)
1. A method for treating desulfurized slag iron is characterized by comprising the following steps: the method comprises the following steps:
adding the desulfurized slag iron into molten iron in a converter for blowing to melt the desulfurized slag iron, wherein the weight of a single piece of desulfurized slag iron is less than or equal to 1500Kg, the thickness of the single piece of desulfurized slag iron is less than or equal to 300mm, and the length of the single piece of desulfurized slag iron is less than or equal to 1000 mm;
the oxygen supply intensity of the converter is 1.9-3.5Nm3The total oxygen supply amount is 3000-3500 Nm3(ii) a BottomThe blowing strength is 0.077-0.124 Nm3/min/t；
The oxygen supply intensity during the blowing of the converter is 3-3.5Nm3Min/t, after confirming ignition, the oxygen supply intensity is adjusted to 1.9-2.0Nm3/min/t；
After the melting of the desulfurized slag iron is finished, tapping the semisteel;
the carbon content of the desulfurized slag iron is more than or equal to 2.80% and less than or equal to 3.20% after the melting is finished, and the temperature of semi-steel tapping is controlled to be more than or equal to 1460 ℃ and less than or equal to 1520 ℃;
adding 800-1500 kg of small-particle lime into molten iron at the beginning of semisteel tapping; adding ferrosilicon after the small-particle lime is added, so that the content of Si in the molten iron is 0.23-0.34%;
controlling on-line bottom blowing argon in the tapping process, wherein the flow rate is controlled to be 500-800N L/min, and after steel is discharged, adopting bottom blowing strong stirring for 3-5min, wherein the bottom blowing flow rate is 800-1500N L/min;
desulfurizing the semisteel molten iron obtained by tapping, wherein the desulfurization period is 60-70 min; the target sulfur content is 0.001-0.005%;
the desulfurization comprises the following steps: the desulfurizer powder is placed in a blowing tank, the desulfurizer powder in the blowing tank is conveyed to a spray gun through carrier gas, and then the desulfurizer is blown into the semi-steel water through the spray gun; the carrier gas flow rate 1-2min before blowing is 100-120Nm3H, setting the speed of the desulfurizer powder to be 7-10 kg/min; when the pressure of the blowing tank is less than or equal to 0.65Mpa, the speed of the desulfurizer powder is adjusted to 10-13 kg/min.
2. The method for treating desulfurized iron slag according to claim 1, wherein: the thickness of the desulfurization slag iron is 10mm-300mm, and the length of the desulfurization slag iron is 10mm-1000 mm.
3. The method for treating desulfurized iron slag according to claim 1, wherein: when the weight of the desulfurization slag iron added into the converter is 35-45t and the molten iron is 185-195t, the charging amount of the converter is controlled at 225-235 t.
4. The method for treating desulfurized iron slag according to claim 1 or 3, wherein: the oxygen supply time is 8-10 min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711285601.1A CN108034788B (en) | 2017-12-07 | 2017-12-07 | Method for treating desulfurized iron slag |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711285601.1A CN108034788B (en) | 2017-12-07 | 2017-12-07 | Method for treating desulfurized iron slag |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108034788A CN108034788A (en) | 2018-05-15 |
| CN108034788B true CN108034788B (en) | 2020-07-17 |
Family
ID=62096193
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711285601.1A Active CN108034788B (en) | 2017-12-07 | 2017-12-07 | Method for treating desulfurized iron slag |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108034788B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110241283A (en) * | 2019-06-13 | 2019-09-17 | 首钢集团有限公司 | A kind of converter of desulfurization slag iron utilizes method |
| CN110396566A (en) * | 2019-07-26 | 2019-11-01 | 首钢集团有限公司 | A kind of method that desulfurization slag iron is eaten in converter time |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102268514A (en) * | 2011-07-04 | 2011-12-07 | 首钢京唐钢铁联合有限责任公司 | Method for recycling KR (Knotted Reactor) desulfurization slag iron |
| CN203034029U (en) * | 2012-12-24 | 2013-07-03 | 四川德胜集团钢铁有限公司 | Recycling system for steelmaking desulfuration slag |
| CN104561428A (en) * | 2014-12-11 | 2015-04-29 | 新疆八一钢铁股份有限公司 | Desulfurization recovery method of slag iron of blowing-process desulfurizing slag |
-
2017
- 2017-12-07 CN CN201711285601.1A patent/CN108034788B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102268514A (en) * | 2011-07-04 | 2011-12-07 | 首钢京唐钢铁联合有限责任公司 | Method for recycling KR (Knotted Reactor) desulfurization slag iron |
| CN203034029U (en) * | 2012-12-24 | 2013-07-03 | 四川德胜集团钢铁有限公司 | Recycling system for steelmaking desulfuration slag |
| CN104561428A (en) * | 2014-12-11 | 2015-04-29 | 新疆八一钢铁股份有限公司 | Desulfurization recovery method of slag iron of blowing-process desulfurizing slag |
Non-Patent Citations (2)
| Title |
|---|
| 铁水脱硫渣铁替代废钢在转炉冶炼的实践;邓丽琴等;《2014年低成本炼钢共性技术研讨会》;20140930;第284-287页 * |
| 铁水预处理脱硫渣铁回收再利用;江腾飞等;《钢铁》;20170228;第52卷(第2期);第24-27、32页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108034788A (en) | 2018-05-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112322837B (en) | Smelting process for efficient slagging and desulfurization of LF (ladle furnace) aluminum killed steel | |
| CN102443675B (en) | Production method of low-sulfur steel | |
| CN103060508A (en) | Smelting method for improving phosphorus removal rate of converter | |
| CN103572001A (en) | Method for controlling alkalinity of ultra-low-sulfur steel LF (ladle furnace) slag | |
| CN102168160B (en) | Converter steelmaking technology for directly reducing-alloying manganese ore | |
| CN103397146A (en) | Production method of pipeline steel | |
| CN113493868B (en) | High scrap ratio converter smelting method based on molten reduced molten iron | |
| CN108034788B (en) | Method for treating desulfurized iron slag | |
| CN102534093A (en) | Control method of two-stage auxiliary material module in revolving furnace smelting process | |
| CN104004882A (en) | Method of semisteel silicon increasing processing and method of semisteel converter steelmaking | |
| CN103820595A (en) | Molten iron desulphurization method | |
| CN103540711B (en) | Method for simultaneously removing sulfur and phosphorus from semi-steel | |
| CN114606357A (en) | Method for removing phosphorus and leaving carbon in medium-high carbon steel by converter | |
| CN111286577A (en) | Smelting method of ultra-low titanium steel | |
| CN103060509A (en) | High-silicon molten iron smelting method | |
| CN114540568B (en) | Smelting method for improving scrap steel ratio | |
| CN103205522A (en) | Method for smelting plain carbon steel from semi-steel | |
| CN111349797A (en) | Method for extracting vanadium from ultra-low silicon vanadium-titanium molten iron by converter | |
| CN114622054B (en) | Method for improving converter end-point manganese ratio | |
| CN116179794A (en) | Technological method for continuously recycling hot casting residue into LF ladle furnace | |
| CN112760449B (en) | Smelting method of slag steel used by Considel electric furnace | |
| CN113355477B (en) | Method for realizing high scrap ratio smelting of converter by bottom blowing hydrogen | |
| CN111893247B (en) | Steelmaking method with high-efficiency refining function | |
| JP4355323B2 (en) | Operation method of a converter equipped with a hot metal storage furnace | |
| CN107354367A (en) | Shorten the smelting process of the vanadium iron duration of heat |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |