WO2018135344A1 - Procédé de traitement de désulfuration destiné à de l'acier fondu, et agent de désulfuration - Google Patents

Procédé de traitement de désulfuration destiné à de l'acier fondu, et agent de désulfuration Download PDF

Info

Publication number
WO2018135344A1
WO2018135344A1 PCT/JP2018/000280 JP2018000280W WO2018135344A1 WO 2018135344 A1 WO2018135344 A1 WO 2018135344A1 JP 2018000280 W JP2018000280 W JP 2018000280W WO 2018135344 A1 WO2018135344 A1 WO 2018135344A1
Authority
WO
WIPO (PCT)
Prior art keywords
molten steel
desulfurization
ladle
range
slag
Prior art date
Application number
PCT/JP2018/000280
Other languages
English (en)
Japanese (ja)
Inventor
勇輔 藤井
中井　由枝
秀弥 正木
菊池　直樹
Original Assignee
Ｊｆｅスチール株式会社
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=62908427&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=WO2018135344(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Ｊｆｅスチール株式会社 filed Critical Ｊｆｅスチール株式会社
Priority to CN201880007085.2A priority Critical patent/CN110177889B/zh
Priority to KR1020197023942A priority patent/KR102290861B1/ko
Priority to EP18741544.3A priority patent/EP3572534B1/fr
Priority to JP2018563279A priority patent/JP6743915B2/ja
Priority to BR112019013592-8A priority patent/BR112019013592B1/pt
Publication of WO2018135344A1 publication Critical patent/WO2018135344A1/fr

Links

Images

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
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/0075—Treating in a ladle furnace, e.g. up-/reheating of molten steel within the ladle
    • 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
    • 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
    • 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
    • C21C7/076—Use of slags or fluxes as treating agents

Definitions

  • the present invention relates to a method for desulfurizing molten steel and a desulfurizing agent.
  • the desulfurization process in the hot metal stage is not sufficient, and in addition to the desulfurization process in the hot metal stage, further desulfurization process in the molten steel stage. Is required.
  • desulfurization treatment at the molten steel stage is performed by an ASEA-SKF method, a VAD method, an LF method, or the like that has a means for heating and stirring the molten steel, and a means for blowing powder such as flux or alloy powder into the molten steel.
  • ASEA-SKF method a desulfurizing agent is added to a ladle containing molten steel melted by decarburization refining in a converter, and the molten steel and desulfurizing agent are agitated and mixed or arc heated to desulfurize.
  • the slag is formed by hatching the desulfurizing agent, and a slag-metal reaction is caused between the slag and the molten steel to transfer the sulfur component in the molten steel into the slag.
  • the desulfurizing agent a desulfurizing agent mainly composed of CaO (quick lime) and added with Al 2 O 3 (alumina), CaF 2 (fluorite), etc. for the purpose of lowering the melting point of the desulfurizing agent is used.
  • the added desulfurization agent is rapidly hatched, and the slag formed by the hatching of the desulfurization agent by increasing the stirring strength. It is important to increase the contact area between the metal and the metal.
  • the desulfurizing agent is generally added on top of the molten steel in the ladle. Even if the desulfurizing agent is hatched by arc heating after the addition, the desulfurizing agent is also stirred and mixed with the molten steel after the addition. Even if hatching, it takes a long time to hatch.
  • Patent Document 1 discloses a flux that is a mixture of quicklime, alumina, and fluorite is added, and then a bubbling treatment is performed, and the slag composition after the desulfurization treatment is changed to CaO. / Al 2 O 3 ⁇ 1.5, a method of desulfurization is disclosed a molten steel as CaF 2 ⁇ 5% by weight.
  • Patent Document 2 discloses a premelt of CaO—Al 2 O 3 (premixed and uniformly dissolved) or CaO—Al 2 O 3 —CaF 2 in order to promote hatching of the desulfurizing agent. A method of using melt flux as a desulfurizing agent is disclosed.
  • Patent Documents 3, 4 and 5 disclose a method in which a flux is mixed and blown into the stirring gas as means for increasing the stirring strength without increasing the stirring gas flow rate. .
  • the present invention has been made in view of the above problems, and its object is to provide a desulfurization treatment method and a desulfurization agent for molten steel that can efficiently perform a desulfurization treatment without using CaF 2 or a premelt flux. Is to provide.
  • the method for desulfurizing a molten steel according to the present invention includes adding a desulfurization agent containing quick lime to a ladle containing the molten steel, and stirring the molten steel in the ladle to reduce the sulfur concentration in the molten steel.
  • a desulfurizing agent containing quick lime having a pore volume within a range of 0.5 to 10 ⁇ m or less and having a total volume of pores of 0.1 mL / g or more is used.
  • the method for desulfurizing a molten steel according to the present invention is characterized in that, in the above-mentioned invention, the quicklime contains 90% or more of particles having a particle size in the range of 1 to 30 mm or less.
  • the desulfurization agent according to the present invention includes quick lime having a pore diameter within a range of 0.5 to 10 ⁇ m or less and a sum of pore volumes of 0.1 mL / g or more, and the quick lime has a particle size of 1 It is characterized by containing 90% or more of particles in the range of ⁇ 30 mm or less.
  • the desulfurization treatment method for molten steel according to the present invention is characterized in that, in the above-described invention, the molten steel is agitated so that the condition of the agitation power density represented by the following formula (1) is satisfied.
  • “Nm 3 ” means a gas volume in a standard state of an atmospheric pressure of 101325 Pa and a temperature of 273.15 K.
  • the method for desulfurizing a molten steel according to the present invention is the above-described invention, wherein the amount of aluminum introduced into the molten steel within 10 minutes after the desulfurization is started after the molten steel is removed from the converter satisfies the following formula (2). It is characterized by doing.
  • the method for desulfurizing molten steel according to the present invention is characterized in that, in the above invention, Ar gas is blown into the ladle so that the oxygen concentration in the ladle is 15% or less.
  • the desulfurization treatment method and desulfurizing agent of the molten steel according to the present invention it is possible to perform efficiently desulfurized without using CaF 2 and premelt flux.
  • FIG. 1 is a schematic side view of an LF facility used in carrying out the present invention.
  • FIG. 2 is a diagram showing hatching rates of the present invention example and the comparative example.
  • the inventors of the present invention have made extensive studies by paying attention to the particle size and pore size of lime and molten steel components. More specifically, the inventors of the present invention use a low-sulfur steel with a sulfur concentration of 0.0030% by mass or less as a main component of a desulfurizing agent using a CaO-containing material as a desulfurization method using a ladle refining method. Even when CaF 2 is not used as a part of the desulfurizing agent in the melting process, even if the desulfurizing agent is not a pre-melt flux, the flux added as the desulfurizing agent is rapidly hatched and efficiently. Various tests and research were repeated for the purpose of desulfurization treatment.
  • the inventors of the present invention can determine the temperature of the molten steel when the flux is added, sol. It has been found that Al concentration, lime particle size, and lime pore size are important. However, the temperature of the molten steel is determined by the temperature of the molten steel at the time of steel output from the converter, and increasing the temperature of the molten steel at the time of steel output unnecessarily increases the melting loss of the converter refractory and reduces the processing cost. It's not a good idea to cause an increase.
  • the inventors of the present invention mainly use quick lime having a pore volume within a range of 0.5 to 10 ⁇ m and having a total volume of 0.1 mL / g or more among pores of lime.
  • a powdery desulfurizing agent as a component, it was found that desulfurization treatment can be performed with high efficiency, and the present invention has been conceived.
  • the pore diameter distribution of quicklime was measured by the method shown below.
  • quicklime was dried at 120 ° C. for 4 hours.
  • the pore distribution of the dried quicklime having a pore diameter in the range of about 0.0036 to 200 ⁇ m is obtained by mercury porosimetry, and a cumulative pore volume curve is calculated. did. Further, the sum of the volumes of pores having a pore diameter in the range of 0.5 to 10 ⁇ m was determined from the calculated cumulative pore volume curve.
  • the hot metal discharged from the blast furnace is received in a hot metal transfer container such as a hot metal ladle or a topped car, and transferred to a converter for decarburization and refining in the next process.
  • a hot metal transfer container such as a hot metal ladle or a topped car
  • hot metal pretreatment such as desulfurization treatment or dephosphorization treatment is performed on the hot metal during the conveyance, and the present invention implements desulfurization treatment because it is a technique for producing low-sulfur steel.
  • dephosphorization is performed to prevent dephosphorization from the converter slag in the desulfurization after the converter steel. To do.
  • decarburization refining is performed in a converter on the hot metal subjected to desulfurization treatment and dephosphorization treatment, and the obtained molten steel is taken out into a ladle.
  • a small amount of quicklime (CaO) and a small amount of dolomite (MgCO 3 —CaCO 3 ) or calcined dolomite (MgO—CaO) ) As a flux to form slag (hereinafter referred to as “converter slag”) in the furnace.
  • This converter slag plays the role of promoting the dephosphorization reaction of the hot metal, but since the hot metal has already been dephosphorized, the main roles are to prevent the occurrence of iron splash during blowing and the converter lining refractory. Is to suppress melting damage.
  • the slag outflow prevention measures that are usually implemented will be implemented. Even if slag outflow prevention measures are implemented, it is difficult to completely prevent converter slag from flowing out, and a certain amount of converter slag enters the ladle and flows out into the molten steel. After steeling out, the converter slag that flows into the molten steel may be removed from the ladle, but the SiO 2 component in the converter slag is used to hatch the CaO-containing material that is subsequently added as a desulfurizing agent. It does not have to be removed because it contributes.
  • CaO—MgO—Al 2 O 3 —SiO 2 -based desulfurization slag having a predetermined composition in the ladle
  • CaO-containing material, MgO-containing material, Al 2 O 3 -containing material, and SiO 2 -containing as flux Add material into pan.
  • MgO has a lower desulfurization ability than CaO
  • the MgO-containing material may not be added.
  • metal Al is added in a ladle for deoxidation of molten steel and reduction of slag (reduction of Fe oxide and Mn oxide in slag).
  • These substances may be added in a post-process facility for performing desulfurization treatment by any one of the ASEA-SKF method, the VAD method, and the LF method, but from the viewpoint of promoting the hatching of CaO. It is preferable to add to the ladle at the time of steel removal from the converter to the ladle or immediately after the steel removal.
  • the quick lime added immediately after the steel is extracted has a pore volume having a pore diameter in the range of 0.5 to 10 ⁇ m among the fine pores of the quick lime, and the sum of the volumes is 0.1 mL / g or more. It is preferable to contain 90% or more of particles having a diameter in the range of 1 to 30 mm.
  • the addition amount of CaO-containing material, MgO-containing material, metal Al, Al 2 O 3 -containing material, and SiO 2 -containing material takes into account the mass and composition of the converter slag that has flowed into the ladle.
  • each addition amount so that (mass% MgO) / (mass% CaO) of the slag to be generated is 0.10 or less. Then, these substances are added to the ladle in a predetermined amount.
  • Metal Al is not necessarily the total amount added is Al 2 O 3, remain dissolved in the molten steel. Therefore, the ratio between the dissolved Al content that dissolves in the molten steel and the amount that becomes Al 2 O 3 in the slag is determined in advance, and the amount of metal Al added is set based on the ratio. CaF 2 is not added.
  • the composition of the ladle slag after the desulfurization treatment is adjusted to a composition containing no CaF 2 substantially
  • the fluorine compound such as CaF 2 as a slag formation accelerators CaO exist means to adjust the slag composition after the desulfurization treatment without, fluorine unavoidably Kitasa have mixed in the CaO-containing material, Al 2 O 3, or the containing material, and the like used by the slag after the desulfurization treatment Even so, it is defined as slag substantially free of CaF 2 .
  • CaO-containing substance to be added quick lime (CaO), limestone (CaCO 3 ), slaked lime (Ca (OH) 2 ), dolomite (MgCO 3 —CaCO 3 ), calcined dolomite (MgO—CaO), etc. are used.
  • As the contained material magnesia clinker (MgO), dolomite (MgCO 3 —CaCO 3 ), calcined dolomite (MgO—CaO), or the like is used.
  • the average particle size of lime is preferably in the range of 1 to 30 mm from the viewpoint of reaction efficiency and addition yield. From the viewpoint of reducing the amount sucked into the exhaust system, it is desirable that the amount of fine powder is small, and it is preferable that lime having an average particle size of 30 mm or more is small.
  • the measuring method of the average particle diameter is as follows. Take 1kg of desulfurization agent, and screen through 9 stages of 500 ⁇ m or less, 500 ⁇ m to 1mm, 1 to 5mm, 5 to 10mm, 10 to 15mm, 15 to 20mm, 20 to 25mm, 25 to 30mm, 30mm or more. The diameter was calculated based on the weight ratio, and the diameter was calculated by the following formula (4).
  • Al 2 O 3 containing materials examples include aluminum dross (containing 20 to 70% by mass of metallic Al, the main component of the balance being Al 2 O 3 ), bauxite (Al 2 O 3 .2H 2 O), calcined alumina (Al using the 2 O 3) or the like. Almidros can also replace Al metal.
  • the SiO 2 containing material silica sand (SiO 2), using the wollastonite (CaO-SiO 2) or the like. In this case, when the mass of the converter slag flowing out into the ladle is large, it may not be necessary to add the SiO 2 -containing material.
  • FIG. 1 is a schematic side view of an LF facility used in carrying out the present invention.
  • reference numeral 1 is an LF facility
  • reference numeral 2 is a ladle
  • reference numeral 3 is an elevating lid
  • reference numeral 4 is an electrode for arc heating
  • reference numerals 5 and 6 are immersion lances
  • reference numerals 7 and 8 are bottom blown porous bricks
  • Reference numeral 9 denotes molten steel
  • reference numeral 10 denotes slag
  • reference numeral 11 denotes a raw material charging chute
  • reference numeral 12 denotes an Ar gas introduction pipe.
  • a ladle 2 that accommodates molten steel 9 loaded on a traveling carriage (not shown) is disposed at a predetermined position directly below the lid 3, and the lid 3 is lowered to move the upper end of the ladle 2.
  • Ar gas is supplied from the Ar gas introduction pipe 12 and the space surrounded by the ladle 2 and the lid 3 is made an Ar gas atmosphere.
  • Ar gas is preferably blown from a pipe attached around the furnace lid so that the oxygen concentration in the ladle 2 is 15% or less.
  • the flow rate of Ar gas blown from the ladle 2 is preferably a value of ⁇ L 2 / 4Q is to range to become a flow rate of 50 ⁇ 150 (m / min) , more preferably, 70 ⁇ 100 (m / min )
  • the flow rate is within the range of.
  • L is the diameter (m) of the ladle
  • Q is the Ar gas flow rate (Nm 3 / min). If the flow rate of Ar gas is small, the oxygen concentration is not sufficiently reduced. Conversely, if the flow rate of Ar gas is too high, the molten steel temperature is lowered.
  • the CaO-containing material, MgO-containing material, metal Al, Al 2 O 3- containing material, and SiO 2 -containing material are not added in advance in the ladle 2, and when the amount of addition of these materials is insufficient In this state, flux of these substances and metal Al are introduced into the ladle 2 through the raw material charging chute 11.
  • the metal Al is preferably added so as to satisfy the following formula (5) within 10 minutes from the start. That is, it is preferable for increasing the Al concentration in the molten steel to promote the desulfurization treatment by adding metal Al according to the Al concentration after the converter steel.
  • the electrode 4 is energized to generate an arc, the molten steel 9 is heated, and the added flux is hatched. Then, the immersion lance 5 or the immersion lance 6 is immersed in the molten steel 9, and the immersion lance 5 Then, Ar gas as a stirring gas is blown into the molten steel 9 from at least one of the immersion lance 6 or the bottom blown porous bricks 7 and 8, and the molten steel 9 is stirred. By stirring the molten steel 9, the flux is mixed with the molten steel 9, and the hatching of the flux proceeds to generate the slag 10.
  • the produced slag 10 is agitated and mixed with the molten steel 9 by the agitation of the molten steel 9, and a slag-metal reaction occurs between the molten steel 9 and the slag 10, and the sulfur component in the molten steel 9 is transferred into the slag.
  • a reaction occurs.
  • any one or more of Ca alloy powder, metal Mg powder, and Mg alloy powder is used together with Ar gas from the immersion lances 5 and 6. It is preferable to blow into the molten steel 9 or to blow the stirring gas from the immersion lances 5 and 6 and the stirring gas from the bottom blown porous bricks 7 and 8 at least at one time of the desulfurization treatment. .
  • Ca alloy powder Ca—Si alloy powder, Ca—Al alloy powder or the like is used, and as the Mg alloy powder, Mg—Al—Zn alloy powder, Mg—Si—Fe alloy powder or the like is used.
  • Mg alloy powder Mg—Al—Zn alloy powder, Mg—Si—Fe alloy powder or the like is used.
  • the desulfurization of molten steel 9 by ladle refining method using a CaO-containing material as a principal constituent of the desulfurizing agent, the slag composition after the desulfurization treatment, the content of SiO 2 Therefore, SiO 2 functions as a CaO hatching accelerator to promote the hatching of CaO, and the slag composition after desulfurization treatment is changed to [( Since mass% CaO) + (mass% MgO)] / (mass% Al 2 O 3 ) is adjusted to be in the range of 1.5 to 3.0, the slag 10 has a high desulfurization capability, As a result, even if CaF 2 is not used as a part of the desulfurizing agent and the desulfurizing agent is not a premelt flux, it is possible to efficiently desulfurize the molten steel 9.
  • the present invention can also be applied to an ASEA-SKF
  • Example 1 The hot metal discharged from the blast furnace is subjected to desiliconization, desulfurization, and dephosphorization, and then the hot metal is charged into a converter to carry out decarburization and refining. Approximately 250 tons of molten steel having a sulfur concentration in the range of 0.0041 to 0.0043% by mass and a phosphorus concentration in the range of 0.004 to 0.010% by mass was obtained. . After steeling out, the ladle slag that had flowed into the ladle was not gradually reduced, and the ladle to which metal Al, quicklime, light-burned dolomite, and aluminum dross were added was conveyed to the LF facility shown in FIG.
  • Table 1 shows the sulfur concentration (chemical analysis value) and desulfurization rate in the molten steel before and after the desulfurization treatment in each desulfurization test. Further, in the remarks column of Table 1, tests within the scope of the present invention are indicated as “examples of the present invention”, and other cases are indicated as “comparative examples”. In addition, a desulfurization rate is the value which displayed the difference of the sulfur concentration in the molten steel before and behind a desulfurization process with a percentage with respect to the sulfur concentration in the molten steel before a desulfurization process.
  • the desulfurization evaluation “ ⁇ ” indicates that the sulfur concentration in the molten steel after the desulfurization treatment was 0.0024% or less, and the desulfurization evaluation “x” indicates that the sulfur concentration in the molten steel after the desulfurization treatment is low. It shows that it was over 0.0024%.
  • test levels and results are shown in Table 1.
  • the desulfurization rate is compared with the present invention examples (test numbers 4 to 15).
  • the average particle size of quicklime was in the range of 1 to 30 mm, hatching was promoted and the desulfurization rate of the molten steel was high.
  • Example 2 The hot metal discharged from the blast furnace is subjected to desiliconization, desulfurization, and dephosphorization, and then the hot metal is charged into a converter to carry out decarburization and refining.
  • About 250 t of molten steel was obtained in the range of 0.09% by mass, the sulfur concentration in the range of 0.0041 to 0.0043% by mass, and the phosphorus concentration in the range of 0.004 to 0.010% by mass.
  • the ladle slag that had flowed into the ladle was not gradually removed, and the ladle to which metal Al, quicklime, light-burned dolomite, and aluminum dross were added was conveyed to the LF facility shown in FIG.
  • Table 2 shows the sulfur concentration (chemical analysis value) and desulfurization rate in the molten steel before and after the desulfurization treatment in each desulfurization test.
  • desulfurization evaluation "(circle)" has shown that the sulfur concentration in the molten steel after a desulfurization process was 0.0024% or less.
  • FIG. 2 is a diagram showing hatching rates of the present invention example and the comparative example.
  • Quick lime having a pore diameter in the range of 0.5 to 10 ⁇ m with a total volume of pores of 0.2 mL / g and a particle size of 20 mm or less is an example of the present invention, and the pore diameter is 0.5 to 10 ⁇ m.
  • Quick lime having a pore volume sum in the range of 0.03 mL / g and a particle size of 20 mm or less was used as a comparative example. As shown in FIG. 2, it was confirmed that hatching was promoted in the inventive example even when the stirring power density (135 W / t) was the same as in the comparative example.
  • Example 4 The hot metal discharged from the blast furnace is subjected to desiliconization, desulfurization, and dephosphorization, and then the hot metal is charged into a converter to carry out decarburization and refining. About 250 t of molten steel having a sulfur concentration within the range of 0.09 mass%, a sulfur concentration within the range of 0.0041 to 0.0044 mass%, and a phosphorus concentration within the range of 0.004 to 0.010 mass% was obtained.
  • the ladle slag that had flowed into the ladle was not gradually removed, and the ladle to which metal Al, quicklime, light-burned dolomite, and aluminum dross were added was conveyed to the LF facility shown in FIG.
  • quick lime having a pore volume within a range of 0.5 to 10 ⁇ m with a pore volume sum of 0.2 mL / g and a particle size of 20 mm or less was used.
  • Table 3 shows the sulfur concentration in the molten steel (chemical analysis value) and the desulfurization rate before and after the desulfurization treatment in each desulfurization test.
  • [sol.Al] 1 is the upper limit value (mass%) of the Al concentration standard of the steel type to be melted
  • [sol.Al] 2 is the Al concentration (mass%) in the molten steel after the converter steel.
  • desulfurization evaluation "(circle)" has shown that the sulfur concentration in the molten steel after a desulfurization process was 0.0024% or less.
  • Example 5 After desiliconization, desulfurization, and dephosphorization are performed on the hot metal discharged from the blast furnace, the hot metal is charged into the converter and decarburized and refined, and the carbon concentration is 0.05-0. About 250 t of molten steel was obtained in the range of 0.09 mass%, the sulfur concentration in the range of 0.0041 to 0.0044 mass%, and the phosphorus concentration in the range of 0.004 to 0.010 mass%. After the steel was tapped, the ladle slag that had flowed into the ladle was not gradually removed, and the ladle to which metal Al, quicklime, light-burned dolomite, and aluminum dross were added was conveyed to the LF facility shown in FIG.
  • Table 4 shows the sulfur concentration (chemical analysis value) and desulfurization rate in the molten steel before and after the desulfurization treatment in each desulfurization test.
  • desulfurization evaluation "(circle)" has shown that the sulfur concentration in the molten steel after a desulfurization process was 0.0024% or less.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)

Abstract

La présente invention concerne un procédé de traitement de désulfuration destiné à de l'acier fondu, destiné à réduire la concentration en soufre d'acier fondu, par l'ajout d'un agent de désulfuration contenant de la chaux vive à une poche de coulée contenant de l'acier fondu, et l'agitation de l'acier fondu dans la poche de coulée. Le procédé est caractérisé en ce que l'agent de désulfuration utilisé est un agent qui contient de la chaux vive, et en ce que la somme des volumes de pores possédant un diamètre de pore compris dans la plage de 0,5 à 10 µm ou moins est d'au moins 0,1 mL/g. Ceci permet d'effectuer efficacement le traitement de désulfuration sans utiliser de flux de CaF2 ou de pré-fusion.
PCT/JP2018/000280 2017-01-19 2018-01-10 Procédé de traitement de désulfuration destiné à de l'acier fondu, et agent de désulfuration WO2018135344A1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
CN201880007085.2A CN110177889B (zh) 2017-01-19 2018-01-10 钢水的脱硫处理方法及脱硫剂
KR1020197023942A KR102290861B1 (ko) 2017-01-19 2018-01-10 용강의 탈황 처리 방법 및 탈황제
EP18741544.3A EP3572534B1 (fr) 2017-01-19 2018-01-10 Procede de traitement de désulfuration d'acier fondu et agent de désulfuration
JP2018563279A JP6743915B2 (ja) 2017-01-19 2018-01-10 溶鋼の脱硫処理方法及び脱硫剤
BR112019013592-8A BR112019013592B1 (pt) 2017-01-19 2018-01-10 Método de processamento por dessulfurização de aço fundido e agente de dessulfurização

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2017-007209 2017-01-19
JP2017007209 2017-01-19

Publications (1)

Publication Number Publication Date
WO2018135344A1 true WO2018135344A1 (fr) 2018-07-26

Family

ID=62908427

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2018/000280 WO2018135344A1 (fr) 2017-01-19 2018-01-10 Procédé de traitement de désulfuration destiné à de l'acier fondu, et agent de désulfuration

Country Status (7)

Country Link
EP (1) EP3572534B1 (fr)
JP (1) JP6743915B2 (fr)
KR (1) KR102290861B1 (fr)
CN (1) CN110177889B (fr)
BR (1) BR112019013592B1 (fr)
TW (1) TWI660049B (fr)
WO (1) WO2018135344A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110315064A (zh) * 2019-06-20 2019-10-11 同济大学 一种金属原料纯化处理剂以及纯化处理方法
TWI704232B (zh) * 2019-04-11 2020-09-11 日商日本製鐵股份有限公司 高效率的熔融鐵合金之精煉方法
CN113088612A (zh) * 2021-03-15 2021-07-09 石家庄钢铁有限责任公司 利用lf炉进行铁水预处理脱硫的方法
CN113832296A (zh) * 2021-09-30 2021-12-24 广东韶钢松山股份有限公司 一种板坯钢在lf精炼炉内的快速脱硫方法
TWI762226B (zh) * 2021-03-05 2022-04-21 國立中興大學 煉鋼用脫硫劑的製備方法

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111621620A (zh) * 2020-06-03 2020-09-04 马鞍山市兴达冶金新材料有限公司 一种提高脱硫效率的脱硫工艺
CN112939042A (zh) * 2021-01-29 2021-06-11 重庆坤垠环保科技实业发展有限公司 铝灰渣与硅灰协同处理利用方法及装置
TWI820759B (zh) * 2022-06-20 2023-11-01 興展技術開發股份有限公司 鋼液脫硫方法

Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6191318A (ja) 1984-10-12 1986-05-09 Nippon Kokan Kk <Nkk> 取鍋精錬炉の操業方法
JPS61281809A (ja) 1985-06-06 1986-12-12 Nippon Steel Corp 溶鋼の取鍋精錬法
JPS6256509A (ja) * 1985-09-04 1987-03-12 Kawasaki Steel Corp 生石灰を用いる溶銑脱硫方法
JPS62283847A (ja) * 1986-05-29 1987-12-09 川崎製鉄株式会社 反応性に優れた精錬剤用の生石灰の製造方法
JPH08260025A (ja) 1995-03-24 1996-10-08 Sumitomo Metal Ind Ltd 極低硫極低酸素鋼の製造方法
JPH09217110A (ja) 1996-02-14 1997-08-19 Sumitomo Metal Ind Ltd 超低硫鋼の溶製方法
JPH11221432A (ja) * 1998-02-04 1999-08-17 Nittetsu Mining Co Ltd 石灰石系脱硫剤およびその製造方法
JP2000234119A (ja) 1999-02-09 2000-08-29 Kawasaki Steel Corp 鋼の脱硫方法
JP2004225059A (ja) * 2002-11-28 2004-08-12 Nippon Steel Corp 溶銑の脱硫方法
JP2009108344A (ja) * 2007-10-26 2009-05-21 Nippon Steel Corp 溶融金属の脱硫剤
WO2017018263A1 (fr) * 2015-07-24 2017-02-02 Ｊｆｅスチール株式会社 Agent de désulfuration, procédé de désulfuration de la fonte en fusion et procédé permettant de produire de la fonte en fusion
JP2017071854A (ja) * 2015-10-05 2017-04-13 Ｊｆｅスチール株式会社 脱硫剤、機械攪拌式溶銑脱硫方法及び脱硫溶銑の製造方法
JP2017071853A (ja) * 2015-10-05 2017-04-13 Ｊｆｅスチール株式会社 機械攪拌式溶銑脱硫方法

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5343308B2 (ja) * 2006-09-11 2013-11-13 Ｊｆｅスチール株式会社 溶鋼の脱硫方法
JP4445564B2 (ja) * 2008-09-05 2010-04-07 新日本製鐵株式会社 溶銑の脱硫方法
KR101366720B1 (ko) * 2009-06-30 2014-02-24 제이에프이 스틸 가부시키가이샤 용선의 탈황 방법
JP5333536B2 (ja) * 2011-07-22 2013-11-06 新日鐵住金株式会社 高清浄度軸受鋼およびその溶製方法
CN102337370B (zh) * 2011-10-26 2013-05-01 辽宁博联特冶金科技有限公司 一种冶炼工业纯铁的装置及方法
CN102517418B (zh) * 2011-12-12 2013-06-05 中北大学 一种多孔颗粒状低碳石灰及其生产方法
JP6451363B2 (ja) * 2015-02-04 2019-01-16 新日鐵住金株式会社 溶鋼の脱硫方法
CN105274272A (zh) * 2015-11-27 2016-01-27 马鞍山钢铁股份有限公司 一种复合喷吹铁水脱硫材料及其调节装置

Patent Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6191318A (ja) 1984-10-12 1986-05-09 Nippon Kokan Kk <Nkk> 取鍋精錬炉の操業方法
JPS61281809A (ja) 1985-06-06 1986-12-12 Nippon Steel Corp 溶鋼の取鍋精錬法
JPS6256509A (ja) * 1985-09-04 1987-03-12 Kawasaki Steel Corp 生石灰を用いる溶銑脱硫方法
JPS62283847A (ja) * 1986-05-29 1987-12-09 川崎製鉄株式会社 反応性に優れた精錬剤用の生石灰の製造方法
JPH08260025A (ja) 1995-03-24 1996-10-08 Sumitomo Metal Ind Ltd 極低硫極低酸素鋼の製造方法
JPH09217110A (ja) 1996-02-14 1997-08-19 Sumitomo Metal Ind Ltd 超低硫鋼の溶製方法
JPH11221432A (ja) * 1998-02-04 1999-08-17 Nittetsu Mining Co Ltd 石灰石系脱硫剤およびその製造方法
JP2000234119A (ja) 1999-02-09 2000-08-29 Kawasaki Steel Corp 鋼の脱硫方法
JP2004225059A (ja) * 2002-11-28 2004-08-12 Nippon Steel Corp 溶銑の脱硫方法
JP2009108344A (ja) * 2007-10-26 2009-05-21 Nippon Steel Corp 溶融金属の脱硫剤
WO2017018263A1 (fr) * 2015-07-24 2017-02-02 Ｊｆｅスチール株式会社 Agent de désulfuration, procédé de désulfuration de la fonte en fusion et procédé permettant de produire de la fonte en fusion
JP2017071854A (ja) * 2015-10-05 2017-04-13 Ｊｆｅスチール株式会社 脱硫剤、機械攪拌式溶銑脱硫方法及び脱硫溶銑の製造方法
JP2017071853A (ja) * 2015-10-05 2017-04-13 Ｊｆｅスチール株式会社 機械攪拌式溶銑脱硫方法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP3572534A4

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI704232B (zh) * 2019-04-11 2020-09-11 日商日本製鐵股份有限公司 高效率的熔融鐵合金之精煉方法
CN110315064A (zh) * 2019-06-20 2019-10-11 同济大学 一种金属原料纯化处理剂以及纯化处理方法
TWI762226B (zh) * 2021-03-05 2022-04-21 國立中興大學 煉鋼用脫硫劑的製備方法
CN113088612A (zh) * 2021-03-15 2021-07-09 石家庄钢铁有限责任公司 利用lf炉进行铁水预处理脱硫的方法
CN113832296A (zh) * 2021-09-30 2021-12-24 广东韶钢松山股份有限公司 一种板坯钢在lf精炼炉内的快速脱硫方法

Also Published As

Publication number Publication date
EP3572534A4 (fr) 2019-11-27
TWI660049B (zh) 2019-05-21
CN110177889B (zh) 2021-06-11
JPWO2018135344A1 (ja) 2019-06-27
BR112019013592A2 (pt) 2020-01-07
KR102290861B1 (ko) 2021-08-17
CN110177889A (zh) 2019-08-27
BR112019013592B1 (pt) 2022-08-16
TW201829790A (zh) 2018-08-16
EP3572534B1 (fr) 2021-04-28
KR20190108136A (ko) 2019-09-23
JP6743915B2 (ja) 2020-08-19
EP3572534A1 (fr) 2019-11-27

Similar Documents

Publication Publication Date Title
WO2018135344A1 (fr) Procédé de traitement de désulfuration destiné à de l&#39;acier fondu, et agent de désulfuration
JP5573424B2 (ja) 溶鋼の脱硫処理方法
JP2013234379A (ja) 極低燐極低硫鋼の溶製方法
JP6028755B2 (ja) 低硫鋼の溶製方法
JP6222490B2 (ja) 溶銑の脱燐方法
JP5895887B2 (ja) 溶鋼の脱硫処理方法
JP6547734B2 (ja) 低硫鋼の製造方法
JP5891826B2 (ja) 溶鋼の脱硫方法
JP4163186B2 (ja) 精錬用フラックス及びその製造方法
JP2007084838A (ja) アルミキルド鋼の製造方法
TWI664294B (zh) 鐵水的脫磷方法
JP5333542B2 (ja) 溶鋼ならびに溶融鉄合金の脱硫方法
JP5341849B2 (ja) リサイクルスラグの製造方法
JP2008169407A (ja) 溶鋼の脱硫方法
JP2016183378A (ja) 溶鋼の脱硫方法
JP6658049B2 (ja) 溶銑の脱珪処理方法
JP6443192B2 (ja) ＦｅＳｉ合金粒を用いたスラグの改質方法
JP2016148075A (ja) 溶銑の精錬方法
JP6375822B2 (ja) 溶銑の脱珪処理方法
JP2022105879A (ja) 精錬方法
JP2009173994A (ja) Ａｌレス極低炭素鋼の溶製方法
JP2011184752A (ja) 溶銑脱珪方法
JP2017193736A (ja) 耐火物を用いたスラグの希釈方法
UA20548U (en) Composition for warming of heel of cast iron in ladle car

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 18741544

Country of ref document: EP

Kind code of ref document: A1

ENP Entry into the national phase

Ref document number: 2018563279

Country of ref document: JP

Kind code of ref document: A

REG Reference to national code

Ref country code: BR

Ref legal event code: B01A

Ref document number: 112019013592

Country of ref document: BR

NENP Non-entry into the national phase

Ref country code: DE

ENP Entry into the national phase

Ref document number: 20197023942

Country of ref document: KR

Kind code of ref document: A

ENP Entry into the national phase

Ref document number: 2018741544

Country of ref document: EP

Effective date: 20190819

ENP Entry into the national phase

Ref document number: 112019013592

Country of ref document: BR

Kind code of ref document: A2

Effective date: 20190628