CN113088612A - Method for pretreating and desulfurizing molten iron by using LF (ladle furnace) - Google Patents
Method for pretreating and desulfurizing molten iron by using LF (ladle furnace) Download PDFInfo
- Publication number
- CN113088612A CN113088612A CN202110277247.8A CN202110277247A CN113088612A CN 113088612 A CN113088612 A CN 113088612A CN 202110277247 A CN202110277247 A CN 202110277247A CN 113088612 A CN113088612 A CN 113088612A
- Authority
- CN
- China
- Prior art keywords
- ladle
- molten iron
- slag
- furnace
- steel
- 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.)
- Pending
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
- C21C1/00—Refining of pig-iron; Cast iron
- C21C1/02—Dephosphorising or desulfurising
- C21C1/025—Agents used for dephosphorising or desulfurising
-
- 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
-
- 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
- C21C7/072—Treatment with gases
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The invention discloses a method for pretreating and desulfurizing molten iron by using an LF (ladle furnace), which comprises the following steps: transporting the ladle to a slag removing position, and removing the top slag in the ladle; adding a desulphurization slag agent into a ladle of an LF furnace; blowing gas at the bottom of the steel ladle, and pouring molten iron in the ladle into the steel ladle; adding a foaming agent into the steel ladle to make foam slag, and stirring by bottom blowing gas; temperature measurement and sampling are carried out after bottom blowing for a period of time; if the sulfur component meets the technical requirements of smelting steel seeds in the converter, closing bottom blowing gas of the LF furnace and removing top slag in a steel ladle; if the component sulfur does not meet the process requirement of smelting steel seeds by the converter, slagging off and adding the desulfurization slag agent again to carry out power transmission stirring desulfurization until the component sulfur in the molten iron meets the process requirement of smelting steel seeds by the converter, closing bottom blowing gas of the LF furnace, and slagging off top slag in a ladle; after the top slag in the ladle is removed, the molten iron is sent into a mixer or a converter, and the molten iron with qualified components is added for smelting. The method has the characteristic of low use investment cost.
Description
Technical Field
The invention relates to a molten iron pretreatment method, in particular to a method for performing molten iron pretreatment and desulfurization by using an LF (ladle furnace).
Background
Sulphur is present in the steel in the form of sulphide inclusions, which have a detrimental effect on the plasticity, toughness, weldability, thickness-wise properties, fatigue properties and corrosion resistance of the steel. Sulphur is present in the steel in the form of iron sulphide (FeS), which forms low melting (985 ℃) compounds with Fe. Since the hot working temperature of steel is generally 1150 to 1200 ℃ or higher, when steel is hot worked, the work is cracked due to premature melting of FeS compounds, which is called "hot embrittlement". The higher the sulfur content, the more severe the hot shortness phenomenon, so the sulfur content in the steel must be controlled.
In view of the harm of sulfur, the low-sulfur steel has high added value and good market prospect, and can meet the requirements of high-end users on high-quality steel; the molten iron pretreatment desulfurization technology is one of the important conditions for improving the product quality of each large steel enterprise, expanding the variety, increasing the efficiency and enhancing the market competitiveness of the product, and is also the foundation for producing low-sulfur clean steel.
In the prior art, the molten iron desulphurization process mainly comprises three processes of single-spray desulphurization, multiple-spray desulphurization and KR desulphurization. The single-spraying and the multiple-spraying belong to the desulfurization by the blowing method, gas is introduced by a spray gun, and a desulfurizer is carried and blown below the liquid level of molten iron, so that the desulfurizer reacts with sulfur to produce a reaction product, and the aim of desulfurization is achieved by floating; KR desulfurization is to make refractory material into a stirrer, insert the stirrer into molten iron for a certain depth and rotate the stirrer, so that the added desulfurizing agent is dispersed in the end region of the blade due to turbulence, and the desulfurizing agent is contacted with the molten iron, mixed and stirred to achieve the aim of desulfurization. However, the above three processes all carry out the pretreatment desulfurization of molten iron in an iron ladle or an iron tank, require increased equipment investment, have strict requirements on the physical and chemical indexes of the desulfurizing agent, are limited by factors such as iron ladle volume, clearance and the like, cannot realize accurate temperature control and monitoring of molten iron components in the process, and have large iron loss in the processes of blowing and stirring.
Disclosure of Invention
The invention aims to provide a method for performing pretreatment desulfurization on molten iron by using an LF (ladle furnace) with good pre-desulfurization effect.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: (1) transporting the ladle to a slag removing position, and removing the top slag in the ladle;
(2) adding a desulphurization slag agent into a ladle of an LF furnace;
(3) blowing gas at the bottom of the steel ladle, and pouring molten iron in the ladle into the steel ladle;
(4) adding a foaming agent into the steel ladle to make foam slag, and stirring by bottom blowing gas; temperature measurement and sampling are carried out after bottom blowing for a period of time; if the sulfur component meets the technical requirements of smelting steel seeds in the converter, closing bottom blowing gas of the LF furnace and removing top slag in a steel ladle; if the component sulfur does not meet the process requirement of smelting steel seeds by the converter, slagging off and adding the desulfurization slag agent again to carry out power transmission stirring desulfurization until the component sulfur in the molten iron meets the process requirement of smelting steel seeds by the converter, closing bottom blowing gas of the LF furnace, and slagging off top slag in a ladle;
(5) after the top slag in the ladle is removed, the molten iron is sent into a mixer or a converter, and the molten iron with qualified components is added for smelting.
In the step (3), the flow rate of the bottom blowing gas is 200-300 NL/min.
In the step (4) of the present invention, the flow rate of the bottom-blowing gas is 600NL/min to 1000 NL/min.
The desulfurization slag agent comprises lime and fluorite, and the binary alkalinity R = 3-7 of a slag system.
The foaming agent provided by the invention adopts silicon carbide, carbonate, calcium carbide and/or a carbon-rich foaming agent.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in: 1. the invention adopts the LF furnace to carry out the pretreatment desulfurization of the molten iron, avoids adding other molten iron pretreatment equipment to steel enterprises, can realize the LF furnace with higher popularization rate in each steel plant, can effectively reduce the equipment investment, and has the characteristic of low use investment cost. 2. Compared with other desulfurization processes, the method has low requirement on physical and chemical indexes of the desulfurizing agent and lower price. 3. The invention can control the temperature range of molten iron to be 1250-1400 ℃, and the target temperature deviation is within +/-10 ℃, thereby meeting the temperature requirement of molten iron for steel making. 4. The invention can desulfurize to extremely low content, and the sulfur content in the molten iron can be controlled to be less than or equal to 0.005 wt%. 5. The bottom blowing gas flow of the invention is adjustable, the molten iron can be prevented from splashing out of the ladle, the iron loss caused by splashing of iron and slag in the molten iron blowing and stirring processes of other processes is avoided, the loss in the molten iron pretreatment desulfurization is greatly reduced, the desulfurization requirement is met, and the production cost is further saved.
Detailed Description
The present invention will be described in further detail with reference to specific embodiments.
The method for performing molten iron pretreatment desulfurization by using the LF furnace comprises the following process steps: (1) and sampling and analyzing molten iron produced in iron making, conveying the molten iron to a slag removing station in a steel plant through a ladle, and removing the slag in the ladle by using a slag remover.
(2) And simultaneously, the desulphurization slag agent is put into a ladle prepared in advance on a ladle car of the LF furnace, and a bottom blowing system is connected with a ladle bottom blowing pipeline. The bottom blowing system is used for providing gas to generate stirring power, the flow pressure of the bottom blowing gas is adjustable, the flow of the bottom blowing gas is 0-1000 NL/min, the pressure is 0-2.0 MPa, and a desulfurization dynamic condition and uniform molten iron temperature are provided.
(3) After the slag removing machine removes the top slag of the iron ladle, opening a bottom blowing system, introducing gas into the ladle bottom blowing air brick, wherein the bottom blowing gas is nitrogen, argon or carbon dioxide, and the gas flow is 200-300 NL/min; pouring molten iron in the ladle into a ladle containing the desulfurization slag agent by using a crown block, adjusting the flow of bottom blowing gas to 50-150 NL/min after pouring, and starting an LF furnace ladle car to a smelting position. The desulfurization slag agent comprises lime and fluorite, and forms a molten iron desulfurization slag system with binary alkalinity R = 3-7; the grade of CaO in the lime is not less than 60 percent, and the grade of CaF in the fluorite is not less than 60 percent2The grade is more than or equal to 50 percent.
(4) Feeding power to the steel ladle, adding a foaming agent to make foam slag for 4-6 min, adjusting the flow of bottom blowing gas to 600 NL/min-1000 NL/min, increasing stirring force but ensuring no molten iron to turn out; the blowing gas flow at the bottom of the LF furnace is large, so that the molten iron and the desulfurization slag agent can be fully mixed and flushed, no stirring dead zone exists, and the desulfurization dynamic condition is met; after power transmission is carried out for 15-25 min, power is cut, temperature measurement and sampling are carried out, the temperature of molten iron is measured, and the components of the molten iron are analyzed; if the sulfur content meets the technological requirements of smelting steel seeds in the converter, the blowing body at the bottom of the LF furnace is closed, a ladle car is started to a ladle hanging position, and a crown block is used for hanging out a ladle to a slag raking machine to rake out slag in the ladle. The foaming agent is used for deoxidizing the top slag on the upper part of the molten iron and foaming the top slag, and is selected from one or more of silicon carbide, carbonate, calcium carbide and a carbon-rich foaming agent; the SiC grade in the silicon carbide is not less than 30 percent, and CaCO in carbonate3+MgCO3More than or equal to 70wt percent, and the grade of C in the carbon-rich foaming agent is more than or equal to 50 percent.
If the sulfur content does not meet the process requirement of smelting steel in the converter, slagging off and adding a desulfurizing slag agent again by using an automatic charging system (or manual work) of the LF furnace to carry out power transmission stirring desulfurization until the sulfur content and the temperature of molten iron meet the process requirement of smelting steel in the converter; and then closing the LF furnace bottom blowing system, starting the ladle car to a ladle hoisting position, and hoisting the ladle to a slag removing machine by using a crown block to remove the slag in the ladle. The desulfurization slag agent adopts the components and the alkalinity required in the step (3).
In the process, the physical heating mode of the LF furnace is utilized to heat and raise the temperature of the molten iron, thermodynamic conditions for molten iron desulphurization are provided, the temperature of the molten iron is compensated, manual narrow-range control can be realized, the temperature range of the molten iron is controlled within 1250-1400 ℃, and the deviation of the target temperature is within +/-10 ℃. The sulfur content of the molten iron can be controlled to be less than or equal to 0.005wt percent, and the sulfur content of the molten iron can meet the requirements of a steel-making process.
(5) And (4) after the slag skimming operation in the step (4) is finished, hoisting the molten iron to a mixer or a converter, and adding the molten iron with qualified components to perform normal smelting.
Example 1: the method for pretreating and desulfurizing molten iron by using the LF adopts the following specific process.
(1) And (3) carrying out temperature measurement, sampling and analysis on molten iron in iron-making production at 1412 ℃ and 0.052% of sulfur, conveying the molten iron to a slag-raking station through a ladle, and then carrying out slag-raking on the ladle by using a slag-raking machine.
(2) Simultaneously, the desulphurization slag agent is put into a ladle prepared in advance on a ladle car of the LF furnace, and a bottom blowing system is connected with a ladle bottom blowing pipeline; the desulfurization slag agent is 350kg of lime and 120kg of fluorite, and the binary alkalinity R = 5.2.
(3) And after the slag raking machine rakes the top slag of the ladle, opening the bottom blowing system, introducing nitrogen into the ladle bottom blowing air brick at a gas flow rate of 270NL/min, pouring molten iron in the ladle into the ladle by using a crown block, closing the bottom blowing gas flow rate to 80NL/min after pouring, and starting the ladle car of the LF furnace to a smelting position.
(4) Electrifying the slagging agent, adding a foaming agent-silicon carbide, making foamed slag for 5min, and increasing the flow of bottom blowing gas to 693 NL/min; after 19min, power is cut off, temperature measurement and sampling are carried out, the temperature of the molten iron is measured to be 1331 ℃ (the process requirement of the converter smelting steel seeds is that the temperature of the molten iron is more than 1300 ℃), the sulfur content of the molten iron is 0.010% (the process requirement of the converter smelting steel seeds is that the sulfur is less than or equal to 0.020%), and the component temperature meets the process requirement of the converter smelting steel seeds; closing bottom blowing gas of the LF furnace, starting a ladle car to a ladle lifting position, and lifting a ladle out to a slag raking machine by using a crown block to rake out slag in the ladle; and after the slag skimming operation is finished, lifting molten iron to a mixer and adding qualified molten iron.
Example 2: the method for pretreating and desulfurizing molten iron by using the LF adopts the following specific process.
(1) The molten iron produced in iron making is subjected to temperature measurement, sampling and analysis, the temperature is 1425 ℃, the sulfur is 0.068%, the molten iron is transported to a slagging-off station through a ladle, and the ladle is subjected to top slag removal by a slag remover.
(2) Simultaneously, the desulphurization slag agent is put into a ladle prepared in advance on a ladle car of the LF furnace, and a bottom blowing system is connected with a ladle bottom blowing pipeline; the desulfurization slag agent is 400kg of lime and 110kg of fluorite, and the binary alkalinity R = 6.1.
(3) After the slag raking machine rakes out the top slag of the iron ladle, opening a bottom blowing system, and introducing carbon dioxide into the ladle bottom blowing air brick at a gas flow rate of 223 NL/min; and pouring molten iron in the ladle into the ladle by using a crown block, closing the flow of bottom blowing gas to 105NL/min after pouring is finished, and starting the ladle car of the LF furnace to a smelting position.
(4) Electrifying the slagging agent, adding a foaming agent-silicon carbide, making foamed slag for 4.5min, and increasing the flow of bottom blowing gas to 836 NL/min; after 21min, power is cut off, temperature measurement and sampling are carried out, the measured molten iron temperature is 1357 ℃ (the process requirement of the converter for smelting the steel seeds is more than 1300 ℃), the molten iron component sulfur is 0.005% (the process requirement of the converter for smelting the steel seeds is less than or equal to 0.015%), and the component temperatures meet the process requirement of the converter for smelting the steel seeds; closing bottom blowing gas of the LF furnace, starting a ladle car to a ladle lifting position, and lifting a ladle out to a slag raking machine by using a crown block to rake out slag in the ladle; and after the slag skimming operation is finished, lifting molten iron to a mixer and adding qualified molten iron.
Example 3: the method for pretreating and desulfurizing molten iron by using the LF adopts the following specific process.
(1) The temperature of molten iron in iron-making production is measured, sampled and analyzed, the temperature is 1481 ℃ and the sulfur is 0.092%, the molten iron is transported to a slagging-off station through a ladle, and the slag is pushed out of the ladle by a slag-off machine.
(2) Simultaneously, the desulphurization slag agent is put into a ladle prepared in advance on a ladle car of the LF furnace, and a bottom blowing system is connected with a ladle bottom blowing pipeline; the desulfurization slag agent is 400kg of lime and 130kg of fluorite, and the binary alkalinity R = 3.0.
(3) And after the slag raking machine rakes the top slag of the ladle, opening a bottom blowing system, introducing argon into the ladle bottom blowing air brick at a gas flow rate of 286NL/min, pouring molten iron in the ladle into the ladle by using a crown block, closing the bottom blowing gas flow rate to 69NL/min after pouring, and starting the ladle car of the LF furnace to a smelting position.
(4) Electrifying the slagging agent, adding a foaming agent-calcium carbide, foaming the foamed slag for 6min, and increasing the flow of bottom blowing gas to 919 NL/min; after 22min, power is cut off, temperature measurement and sampling are carried out, the temperature of molten iron is 1385 ℃ (the temperature of molten iron is 1350-1400 ℃) according to the process requirement of smelting steel seeds by a converter, the sulfur content of the molten iron is 0.004% (the sulfur content of the process requirement of smelting steel seeds by the converter is less than or equal to 0.010%), and the component temperature meets the process requirement of smelting steel seeds by the converter; and closing bottom blowing gas of the LF furnace, starting the ladle car to a ladle lifting position, lifting the ladle to a slag raking machine by using a crown block to rake out slag in the ladle, lifting molten iron to a mixer furnace after slag raking operation is finished, and adding qualified molten iron.
Example 4: the method for pretreating and desulfurizing molten iron by using the LF adopts the following specific process.
(1) The molten iron produced in iron making is subjected to temperature measurement, sampling and analysis, the temperature is 1491 ℃, the sulfur is 0.114%, the molten iron is transported to a slag skimming station through a ladle, and the slag is raked out of the ladle by a slag raking machine.
(2) Simultaneously, the desulphurization slag agent is put into a ladle prepared in advance on a ladle car of the LF furnace, and a bottom blowing system is connected with a ladle bottom blowing pipeline; the desulfurization slag agent is 500kg of lime and 150kg of fluorite, and the binary alkalinity R = 7.0.
(3) After the slag raking machine rakes out the top slag of the iron ladle, opening a bottom blowing system, and introducing carbon dioxide into the ladle bottom blowing air brick at the gas flow rate of 300 NL/min; and pouring molten iron in the ladle into the ladle by using a crown block, closing the flow of bottom blowing gas to 150NL/min after pouring is finished, and starting the ladle car of the LF furnace to a smelting position.
(4) Electrifying the slagging agent, adding a foaming agent-a carbon-rich foaming agent, making foamed slag for 5min, and increasing the flow of bottom blowing gas to 1000 NL/min; after 15min, power is cut off, temperature measurement and sampling are carried out, the temperature of molten iron is measured to 1392 ℃ (the temperature of molten iron is more than 1350 ℃) and the sulfur of molten iron is measured to be 0.016% (the temperature of molten iron is less than or equal to 0.015%) and the sulfur of molten iron does not meet the process requirement of smelting steel by a converter; after slagging off, adding the desulfurization slag agent in the step (2) to carry out power transmission stirring desulfurization; measuring the temperature of the molten iron after 15min at 1409 ℃ and the sulfur content of the molten iron at 0.005 percent, wherein the component temperatures meet the process requirements of smelting steel grades in a converter; closing bottom blowing gas of the LF furnace, starting a ladle car to a ladle lifting position, and lifting a ladle out to a slag raking machine by using a crown block to rake out slag in the ladle; and after the slag skimming operation is finished, lifting molten iron to a mixer and adding qualified molten iron.
Example 5: the method for pretreating and desulfurizing molten iron by using the LF adopts the following specific process.
(1) The temperature of molten iron in iron making production is measured, sampled and analyzed, the temperature is 1513 ℃ and the sulfur is 0.106 percent, the molten iron is transported to a slag skimming station through a ladle, and the slag is raked out from the ladle by a slag raking machine.
(2) Simultaneously, the desulphurization slag agent is put into a ladle prepared in advance on a ladle car of the LF furnace, and a bottom blowing system is connected with a ladle bottom blowing pipeline; the desulfurizing slag agent is 330kg of lime and 110kg of fluorite, and the binary alkalinity R = 4.1.
(3) And after the slag raking machine rakes the top slag of the ladle, opening a bottom blowing system, introducing argon into the ladle bottom blowing air brick at a gas flow rate of 200NL/min, pouring molten iron in the ladle into the ladle by using a crown block, closing the bottom blowing gas flow rate to 50NL/min after pouring, and starting an LF furnace ladle car to a smelting position.
(4) Electrifying the slagging agent, adding a foaming agent-carbonate, making foamed slag for 4min, and increasing the flow of bottom blowing gas to 600 NL/min; after 25min, power is cut off, temperature measurement and sampling are carried out, the temperature of molten iron is 1311 ℃ (the temperature of molten iron is 1300-1400 ℃) according to the process requirement of smelting steel seeds by a converter), the sulfur content of the molten iron is 0.012% (the sulfur content is less than or equal to 0.010%) and the sulfur content does not meet the process requirement of smelting steel seeds by the converter; after slagging off, adding the desulfurization slag agent in the step (2) to carry out power transmission stirring desulfurization; measuring the temperature of the molten iron 1319 ℃ and the sulfur content of the molten iron 0.004% after 12min, wherein the component temperatures meet the process requirements of smelting steel in a converter; and closing bottom blowing gas of the LF furnace, starting the ladle car to a ladle lifting position, lifting the ladle to a slag raking machine by using a crown block to rake out slag in the ladle, lifting molten iron to a mixer furnace after slag raking operation is finished, and adding qualified molten iron.
Claims (5)
1. A method for pretreating and desulfurizing molten iron by using an LF (ladle furnace) is characterized by comprising the following steps: (1) transporting the ladle to a slag removing position, and removing the top slag in the ladle;
(2) adding a desulphurization slag agent into a ladle of an LF furnace;
(3) blowing gas at the bottom of the steel ladle, and pouring molten iron in the ladle into the steel ladle;
(4) adding a foaming agent into the steel ladle to make foam slag, and stirring by bottom blowing gas; temperature measurement and sampling are carried out after bottom blowing for a period of time; if the sulfur component meets the technical requirements of smelting steel seeds in the converter, closing bottom blowing gas of the LF furnace and removing top slag in a steel ladle; if the component sulfur does not meet the process requirement of smelting steel seeds by the converter, slagging off and adding the desulfurization slag agent again to carry out power transmission stirring desulfurization until the component sulfur in the molten iron meets the process requirement of smelting steel seeds by the converter, closing bottom blowing gas of the LF furnace, and slagging off top slag in a ladle;
(5) after the top slag in the ladle is removed, the molten iron is sent into a mixer or a converter, and the molten iron with qualified components is added for smelting.
2. The method for pretreating and desulfurizing molten iron by using the LF furnace, according to claim 1, is characterized in that: in the step (3), the flow rate of the bottom blowing gas is 200-300 NL/min.
3. The method for pretreating and desulfurizing molten iron by using the LF furnace, according to claim 1, is characterized in that: in the step (4), the flow rate of the bottom-blowing gas is 600NL/min to 1000 NL/min.
4. The method for pretreating and desulfurizing molten iron by using the LF furnace, according to claim 1, is characterized in that: the sulfur slag agent comprises lime and fluorite, and the binary alkalinity R = 3-7 of a slag system.
5. The method for pretreating and desulfurizing molten iron by using an LF furnace according to any one of claims 1-4, wherein: the foaming agent is silicon carbide, carbonate, calcium carbide and/or a carbon-rich foaming agent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110277247.8A CN113088612A (en) | 2021-03-15 | 2021-03-15 | Method for pretreating and desulfurizing molten iron by using LF (ladle furnace) |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110277247.8A CN113088612A (en) | 2021-03-15 | 2021-03-15 | Method for pretreating and desulfurizing molten iron by using LF (ladle furnace) |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113088612A true CN113088612A (en) | 2021-07-09 |
Family
ID=76667465
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110277247.8A Pending CN113088612A (en) | 2021-03-15 | 2021-03-15 | Method for pretreating and desulfurizing molten iron by using LF (ladle furnace) |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113088612A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114875208A (en) * | 2022-05-25 | 2022-08-09 | 宝武集团鄂城钢铁有限公司 | Production method for converter early-stage rapid desulfurization |
| CN115287404A (en) * | 2022-07-29 | 2022-11-04 | 鞍钢股份有限公司 | Pretreatment method of molten iron in converter |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103451368A (en) * | 2012-06-04 | 2013-12-18 | 北大方正集团有限公司 | Steel desulfurizing method |
| CN103572001A (en) * | 2013-11-01 | 2014-02-12 | 南京钢铁股份有限公司 | Method for controlling alkalinity of ultra-low-sulfur steel LF (ladle furnace) slag |
| CN103898269A (en) * | 2014-04-02 | 2014-07-02 | 南京钢铁股份有限公司 | Ultralow sulfur steel quick smelting method |
| WO2018135344A1 (en) * | 2017-01-19 | 2018-07-26 | Ｊｆｅスチール株式会社 | Desulfurization treatment method for molten steel, and desulfurization agent |
-
2021
- 2021-03-15 CN CN202110277247.8A patent/CN113088612A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103451368A (en) * | 2012-06-04 | 2013-12-18 | 北大方正集团有限公司 | Steel desulfurizing method |
| CN103572001A (en) * | 2013-11-01 | 2014-02-12 | 南京钢铁股份有限公司 | Method for controlling alkalinity of ultra-low-sulfur steel LF (ladle furnace) slag |
| CN103898269A (en) * | 2014-04-02 | 2014-07-02 | 南京钢铁股份有限公司 | Ultralow sulfur steel quick smelting method |
| WO2018135344A1 (en) * | 2017-01-19 | 2018-07-26 | Ｊｆｅスチール株式会社 | Desulfurization treatment method for molten steel, and desulfurization agent |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114875208A (en) * | 2022-05-25 | 2022-08-09 | 宝武集团鄂城钢铁有限公司 | Production method for converter early-stage rapid desulfurization |
| CN115287404A (en) * | 2022-07-29 | 2022-11-04 | 鞍钢股份有限公司 | Pretreatment method of molten iron in converter |
| CN115287404B (en) * | 2022-07-29 | 2023-11-10 | 鞍钢股份有限公司 | Converter molten iron pretreatment method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101660021B (en) | Method for desulfurizing ultra-low carbon pure steel in circulating vacuum degassing method | |
| CN113088612A (en) | Method for pretreating and desulfurizing molten iron by using LF (ladle furnace) | |
| CN102367503B (en) | Method for controlling contents of phosphorus, sulfur and hydrogen in molten steel | |
| CN100510112C (en) | Short-flow super low carbon steel ultra-low sulphur smelting control method | |
| CN112481551B (en) | Steel WB36V for power station and smelting and continuous casting production process thereof | |
| CN101768656B (en) | Method for refining ultra-low carbon ferritic stainless steel under vacuum | |
| CN105177427A (en) | Steel for 30CrMo gas cylinders and production method thereof | |
| CN104789718A (en) | Steel slag recycling method | |
| CN110438287B (en) | Converter process control method for producing SPHC steel grade | |
| CN103233096A (en) | Low-carbon deep-desulfurization refining method of LF (ladle refining) furnace | |
| CN110029278A (en) | A kind of low aluminum steel of high cleanliness Ultra-low carbon and its production method | |
| UA126159C2 (en) | Slagging method during production of ultralow-phosphorus steel, and method for producing ultralow-phosphorus steel | |
| CN108866432A (en) | A kind of acid-resistant pipeline steel and smelting process | |
| CN103555886B (en) | Method for smelting ultralow-sulfur steel by using vanadium-containing molten iron | |
| CN105950826A (en) | Deoxidizer for refining lag of ladle refining furnace and application method thereof | |
| CN101403023A (en) | Ultra-deep desulfuration method for hot metal | |
| CN103642963B (en) | Method for lowering sulfur return amount of desulfurized vanadium-titanium-containing molten iron | |
| CN109280733A (en) | A kind of smelting process of dephosphorization converter terminal low phosphorus content molten steel | |
| Sardar et al. | Optimisation of inclusion chemistry by improved steel cleanliness and optimum calcium treatment | |
| CN103966395B (en) | Aluminium killed steel waters the Application way of recrement in stainless steel is produced | |
| CN114250334A (en) | Desulfurization slag modifier and molten iron desulfurization method | |
| CN104694688B (en) | The compound desulfurization slag slag state regulator of magnesium and the compound desulfurization Slag modification method of magnesium | |
| CN111996314A (en) | Method for extracting iron by using carbon reduction thermal state converter slag | |
| CN110885911A (en) | Process for pretreating, desiliconizing and dephosphorizing KR molten iron | |
| CN109371190B (en) | Method for desiliconizing high-silicon molten iron by using continuous casting cutting waste residues |
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 | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20210709 |