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EP3327150B1 - Agent de désulfuration, procédé de désulfuration de la fonte en fusion et procédé permettant de produire de la fonte en fusion - Google Patents

Agent de désulfuration, procédé de désulfuration de la fonte en fusion et procédé permettant de produire de la fonte en fusion Download PDF

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EP3327150B1
EP3327150B1 EP16830368.3A EP16830368A EP3327150B1 EP 3327150 B1 EP3327150 B1 EP 3327150B1 EP 16830368 A EP16830368 A EP 16830368A EP 3327150 B1 EP3327150 B1 EP 3327150B1
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Prior art keywords
desulfurization
hot metal
flux
quicklime
desulfurization flux
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German (de)
English (en)
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EP3327150A4 (fr
EP3327150A1 (fr
Inventor
Yoshie Nakai
Naoki Kikuchi
Hideya Masaki
Akira Ichikawa
Hiroharu Ido
Yuji Miki
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JFE Steel Corp
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JFE Steel Corp
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C1/00—Refining of pig-iron; Cast iron
    • C21C1/02—Dephosphorising or desulfurising
    • 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
    • C21C7/0037—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 by injecting powdered material
    • 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
    • C21C7/0645—Agents used for dephosphorising or desulfurising
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D27/00—Stirring devices for molten material
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D3/18—Charging particulate material using a fluid carrier
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D3/18—Charging particulate material using a fluid carrier
    • F27D2003/185—Conveying particles in a conduct using a fluid

Definitions

  • the present invention relates to a desulfurization flux, a method for hot metal desulfurization, and a method for producing hot metal.
  • hot metal tapped from a blast furnace contains sulfur (S) that has a negative influence on the quality of steel at high concentration. Therefore, in a steel making step, various hot metal preliminary treatment and molten steel desulfurization are performed in accordance with required quality.
  • S sulfur
  • various hot metal preliminary treatment and molten steel desulfurization are performed in accordance with required quality.
  • an injection desulfurizing method in which desulfurization is performed by injecting a desulfurization flux into hot metal also referred to as "hot metal desulfurization”
  • a mechanical-stirring type desulfurizing method in which desulfurization is performed by adding a desulfurization flux to hot metal stirred by a stirring blade, and the like are known.
  • calcium carbide-based and soda-based desulfurization flux are in practical use, but both desulfurization flux have advantages and disadvantages.
  • the calcium carbide-based desulfurization flux has strong desulfurization ability, but there is a problem in that acetylene gas is generated in posttreatment of slag generated by desulfurization treatment.
  • the calcium carbide-based desulfurization flux is expensive, and furthermore, is a hazardous material, handling is difficult.
  • the soda-based desulfurization flux is relatively inexpensive, but is highly alkalic, and thus, has a large influence on refractories, such as a furnace and a vessel.
  • the soda-based desulfurization flux contains Na in exhaust gas, and thus, removal treatment thereof is necessary. Furthermore, the soda-based desulfurization flux has high Na 2 O content in slag, and thus, recycling for cement or the like is limited. Therefore, it cannot be said that the calcium carbide-based and soda-based desulfurization flux are desirable desulfurization flux in view of the influence on environment, as in fluorine. Furthermore, as a desulfurizing method using a desulfurization flux other than the calcium carbide-based and soda-based desulfurization flux, a method using metal Mg as a desulfurization flux is well known.
  • Metal Mg easily reacts with S in hot metal to generate MgS, but violently vaporizes in hot metal at 1250°C to 1500°C because of having a low boiling point of 1100°C, and is at risk of spattering the hot metal.
  • metal Mg since generated Mg vapor is diffused into the air without sufficiently contributing to a desulfurizing reaction, the efficiency is poor.
  • metal Mg is extremely expensive, thereby leading to an increase in cost necessary for the desulfurization treatment.
  • PTL 2 As a technology for improving desulfurization ability of quicklime itself, an effort to improve desulfurization efficiency of a desulfurization flux from the viewpoints of lime properties is made.
  • a method for controlling a density, a specific surface area, a pore diameter volume as lime properties, in hot metal desulfurization by an injection desulfurizing method is disclosed in PTL 2, 3.
  • PTL 2 3 by controlling these lime properties, a floating-up speed of a desulfurization flux injected into hot metal can be controlled (lowered), and a reaction of the hot metal and the desulfurization flux can be accelerated.
  • the injection desulfurizing method is targeted as a method of hot metal desulfurization, and the lime properties are not optimum in a mechanical-stirring type desulfurizing method.
  • the particle diameter of the targeted desulfurization flux is small, 200 ⁇ m or less.
  • a powdery desulfurization flux added to a bath surface of hot metal is involved in the hot metal, and the desulfurization flux reacts with S in the hot metal.
  • a method for top-adding the desulfurization flux to the bath surface also referred to as top-adding method
  • aggregation of the desulfurization flux proceeds, so that a reaction interface area becomes small, and a decrease in desulfurization efficiency was a problem.
  • slag after desulfurization treatment becomes aggregated particles having a size of a few millimeters to a few tens of millimeters .
  • a method for blasting a powdery desulfurization flux on a bath surface (also referred to as powder blasting method) is known.
  • powder blasting method since aggregation of the desulfurization flux when being involved in hot metal is suppressed compared to the top-adding method, a practical reaction interface area becomes large, and the desulfurization ability can be improved.
  • the aggregation of the blasted desulfurization flux still proceeds, and thus, the reaction interface area of the desulfurization flux itself could not be sufficiently used.
  • PTL 4 For this problem in the powder blasting method, a method of blasting a desulfurization flux using carrier gas is disclosed in PTL 4, 5.
  • PTL 4 5 penetration of the desulfurization flux itself into hot metal is accelerated by using the carrier gas, so that aggregation of the desulfurization flux can be suppressed.
  • the properties of quicklime are not considered at all in the powder blasting method described in PTL 4, 5, a technology for further improving desulfurization efficiency of quicklime from the viewpoints of lime properties is required.
  • the present invention was made in view of the above-described problems, and it is an object of the present invention to provide a desulfurization flux, a method for desulfurizing hot metal, and a method for producing hot metal, which have excellent desulfurization efficiency and are capable of reducing the cost necessary for desulfurization treatment.
  • a desulfurization flux used for hot metal desulfurization is as specified in anyone of appended claims 1 to 4.
  • a method for desulfurizing hot metal is as specified in anyone of appended claims 5 to 8.
  • a method for producing hot metal using the claimed method for desulfurizing hot metal is as specified in claim 9.
  • a desulfurization flux, a method for desulfurizing hot metal, and a method for producing hot metal, which have excellent desulfurization efficiency and are capable of reducing the cost necessary for desulfurization treatment, are provided.
  • Table 1 illustrates a mechanical-stirring type desulfurization device 1 used in a first test
  • Table 1 indicates conditions of devices and test methods by which the first test was conducted.
  • Hot metal Conditions Weight 300 t/ch Hot metal transfer Ladle Diameter 4 m Temperature 1280-1330 °C Before Treatment
  • S 0.025-0.035 wt% Desulfurization flux Conditions
  • Type CaO Granularity 0.1-10 mm
  • Additive Amount (CaO) 5 kg/t Stirring Conditions Number of Blades 4 Blade Diameter 1.45 m Rotation Speed of Blades 130 rpm Stirring Time 15 min Adding Conditions Top-Adding Method Addition Rate of Desulfurization Flux 1000 kg/min Powder Blasting Method Lance Diameter 65A* Addition Rate of Desulfurization Flux 200 kg/min Flow Rate of Nitrogen Gas 0-7 Nm 3 /min *: Lance diameter according JIS G3459/G3468 5S
  • the mechanical-stirring type desulfurization device 1 is a refining device that performs desulfurization treatment of hot metal 3 stored in a hot metal transfer ladle 2.
  • the hot metal transfer ladle 2 is arranged at a treatment position with being placed on a wagon 4.
  • the ladle diameter of the hot metal transfer ladle 2 was set to be 4 m
  • the weight of the hot metal 3 was set to be 300 t/ch
  • the temperature of the hot metal 3 was set to be from 1280°C to 1330°C
  • the S concentration of the hot metal 3 before the desulfurization treatment ([S]) was set to be from 0.025 wt% to 0.035 wt%.
  • ch is a unit indicating the number of times of the desulfurization treatment performed for each hot metal transfer ladle 2 by the mechanical-stirring type desulfurization device 1, and 300 t/ch indicates that the weight of the hot metal 3 to be treated in one desulfurization treatment (the weight of the hot metal 3 stored in the hot metal transfer ladle 2) is 300 t.
  • the mechanical-stirring type desulfurization device 1 includes a stirring blade (impeller) 5, a powder blasting means 6, and a top-adding means 7.
  • the stirring blade 5 is a refractory stirrer, is connected to a shaft at the upper end in a vertical direction (an up-and-down direction with respect to the plane of paper of FIG. 1 ), and has four blades that project in a direction perpendicular to a central shaft centered at the shaft.
  • the upper end side of the shaft of the stirring blade 5 is connected to a rotating device and/or an elevating device, which is not illustrated. When the shaft receives rotary drive from the rotating device, the stirring blade 5 rotates around the shaft.
  • the stirring blade 5 is configured to be capable of elevating in the vertical direction by elevating operation of the elevating device.
  • the desulfurization treatment was performed by setting the diameter of the stirring blade 5 to be 1.45 m and rotating the stirring blade 5 at a rotation speed of 130 rpm.
  • the powder blasting means 6 has a hopper 8, a rotary feeder 9, and a lance 10.
  • the hopper 8 stores a desulfurization flux.
  • the rotary feeder 9 cuts out the desulfurization flux stored in the hopper 8 at a predetermined cutout speed, and supplies the desulfurization flux to the lance 10.
  • the lance 10 is a 65A lance, and is arranged above a bath surface of the hot metal 3 so as to extend in the vertical direction.
  • the lance 10 jets the desulfurization flux cut out from the rotary feeder 9 together with nitrogen that is carrier gas supplied from a carrier gas supplying device, which is not illustrated, so that the desulfurization flux is sprayed on the bath surface of the hot metal 3.
  • the top-adding means 7 has a hopper 11, a rotary feeder 12, and an injecting chute 13.
  • the hopper 11 stores a desulfurization flux.
  • the rotary feeder 12 cuts out the desulfurization flux stored in the hopper 11 at a predetermined cutout speed, and supplies the desulfurization flux to the injecting chute 13.
  • the injecting chute 13 is arranged such that the lower end is above the bath surface of the hot metal 3, and makes the desulfurization flux supplied from the rotary feeder 12 free-fall from the end, so that the desulfurization flux is injected into the bath surface of the hot metal 3.
  • the desulfurization treatment was performed by adding the desulfurization flux to the hot metal 3 by either adding method of a powder blasting method using the powder blasting means 6 or a top-adding method using the top-adding means 7.
  • the flow rate of the nitrogen gas was set to be 0 Nm 3 /min to 7 Nm 3 /min, and the desulfurization flux was added at an addition rate of 200 kg/min.
  • the desulfurization flux was added at an addition rate of 1000 kg/min.
  • the desulfurization treatment was performed under the conditions where the total pore volume of quicklime or the particle diameter of quicklime is changed.
  • the total pore volume of quicklime is calculated from pore diameter distribution to be measured.
  • a method for measuring the pore diameter distribution is as follows. First, quicklime was dried at a constant temperature of 120°C for 4 hours as pretreatment. Next, pore distribution in which the pore diameter of the dried quicklime is about from 0.0036 ⁇ m to 200 ⁇ m was obtained by the mercury intrusion technique using AutoPore IV 9520 manufactured by Micromeritics Instrument Corp., and a cumulative pore volume curve was calculated. Furthermore, the total pore volume of pores having a diameter of from 0.5 ⁇ m to 10 ⁇ m was obtained from the calculated cumulative pore volume curve. The pore diameter was calculated using Washburn's equation (equation (2)).
  • P ⁇ D ⁇ 4 ⁇ ⁇ ⁇ cos ⁇ ⁇
  • the particle diameter is an average particle diameter, and a predetermined average particle diameter was obtained by screening the desulfurization flux.
  • a method for measuring the average particle diameter of the desulfurization flux is as follows. First, 500 g of the desulfurization flux is collected during shipping from a manufacturer or during loading up the hopper 8. Next, the collected desulfurization flux was screened into 9 steps, 45 ⁇ m or less, 45 ⁇ m to 75 ⁇ m, 75 ⁇ m to 100 ⁇ m, 100 ⁇ m to 125 ⁇ m, 125 ⁇ m to 150 ⁇ m, 150 ⁇ m to 300 ⁇ m, 300 ⁇ m to 500 ⁇ m, 500 ⁇ m to 1000 ⁇ m, and 1000 ⁇ m or more.
  • the average particle diameter was calculated by calculation with a weight ratio of equation (3).
  • D a indicates the average particle diameter (mm)
  • d i indicates an average particle diameter in each of particle diameter ranges (screen mesh medium value) (mm)
  • w i indicates a weight of the desulfurization flux on each screen (kg).
  • D a ⁇ i w i ⁇ i w i / d i
  • FIG. 3 a relationship of the average particle diameter of the desulfurization flux and the desulfurization rate when using the powder blasting method or the top-adding method is illustrated in FIG. 3 .
  • the total pore volume of pores having a pore diameter of from 0.5 ⁇ m to 10 ⁇ m was set to be 0.2 mL/g.
  • the desulfurization rate is significantly increased in a range where the average particle diameter of the desulfurization flux is from 210 ⁇ m to 500 ⁇ m.
  • the adding method of the desulfurization flux in the mechanical-stirring type desulfurizing method at least one of the top-adding method and the powder blasting method is generally used.
  • the foregoing adding method it becomes difficult to add a desulfurization flux having a small diameter into hot metal in good yield unlike an injection desulfurizing method in which all of an added desulfurization flux penetrates into hot metal. Therefore, in the mechanical-stirring type desulfurizing method, in order to improve the yield, the particle diameter of the desulfurization flux to be added is important.
  • the desulfurization flux having a small particle diameter becomes more difficult to penetrate into the hot metal as the diameter becomes smaller, and thus, increases the probability of not contributing to the reaction even when being added.
  • the particle diameter of the desulfurization flux to be added is made large, there is an advantage for the penetration into the hot metal to improve the yield, but the reaction interface area is decreased, and there is a disadvantage from the viewpoints of the desulfurizing reaction. Therefore, in order to accelerate the reaction while ensuring the yield for the hot metal, it is important to achieve a balance between ensuring of an appropriate particle diameter of the desulfurization flux and increasing of the reaction efficiency.
  • the present inventors found that, in order to improve the desulfurization efficiency in the mechanical-stirring type desulfurizing method using quicklime as the desulfurization flux, existence of pores having a pore diameter of from 0.5 ⁇ m to 10 ⁇ m is important, and it is important to use the desulfurization flux in which the total pore volume of the pores is 0.1 mL/g or more. Furthermore, it was found that, as the desulfurization flux, by using one having an average particle diameter of from 210 ⁇ m to 500 ⁇ m, an appropriate particle diameter for improving the yield during addition to the hot metal can be ensured.
  • the desulfurization efficiency can be more improved. Furthermore, it was found that, when the desulfurization flux under the conditions is used in the mechanical-stirring type desulfurizing method, a higher desulfurization rate can be obtained by using the powder blasting method as the adding method of the desulfurization flux to the hot metal 3, compared to the top-adding method. The following phenomenon is considered from these results of the first test.
  • Quicklime is solid at a temperature where hot metal desulfurization is performed, and when quicklime added to the bath surface of the hot metal 3 has the above-described pore diameter size, the hot metal 3 penetrates into the pores of the surface of quicklime, so that wettability of the hot metal 3 and quicklime is physically improved. Accordingly, it is considered that the penetration of quicklime into the hot metal 3 is accelerated, and the desulfurization efficiency is improved.
  • the present inventors performed the desulfurization treatment under various stirring conditions as a second test.
  • the second test in the same manner as the first test, only powdery quicklime was used as the desulfurization flux, and quicklime in which the total pore volume of pores having a pore diameter of from 0.5 ⁇ m to 10 ⁇ m is 0.1 mL/g or more and the particle diameter is 2 mm or less was used.
  • the additive amount of the desulfurization flux was the constant amount, 5 kg/t, and the desulfurization treatment was performed without adding an additive agent other than a component inevitably contained in quicklime.
  • the desulfurization treatment was performed using the mechanical-stirring type desulfurization device 1 illustrated in FIG. 1 .
  • the powder blasting means 6 was used when adding the desulfurization flux, and the adding conditions of the desulfurization flux were made the same as those of the first test.
  • the second test by changing the position of the bath surface of the hot metal 3 on which the desulfurization flux is sprayed and the rotation speed of the stirring blade 5, the influence of these stirring conditions on the desulfurization rate was searched.
  • the flow rate in the horizontal direction is a flow rate of a swirling flow generated from mechanical stirring at a position where the desulfurization flux is sprayed on the bath surface of the hot metal 3 in a horizontal tangent direction.
  • the desulfurization treatment of the hot metal 3 is performed using the mechanical-stirring type desulfurization device 1 illustrated in FIG. 1 in the same manner as the above-described first and second tests.
  • the mechanical-stirring type desulfurization device 1 has a cover (not illustrated) that covers an upper opening part of the hot metal transfer ladle 2, and an exhaust duct (not illustrated) that is provided on the cover and is connected to an exhaust device (not illustrated). Gas and dust generated during the desulfurization treatment are discharged to the exhaust device through the exhaust duct.
  • the desulfurization flux is quicklime in which the total pore volume defined as the sum of the volumes of pores having a pore diameter of from 0.5 ⁇ m to 10 ⁇ m is 0.1 mL/g or more and the average particle diameter is from 210 ⁇ m to 500 ⁇ m. It is to be noted that, preferably, the minimum value of the particle diameter of quicklime is 40 ⁇ m or more, in consideration of spattering during the addition or the like.
  • quicklime may be fired in any furnace, such as a kiln furnace, a Maerz furnace, and a Beckenbach furnace.
  • the desulfurization flux cut out by the rotary feeder 9 is injected from the lance 10 into the bath surface of the hot metal 3 together with the carrier gas, such as nitrogen, thereby the desulfurization flux is added to the hot metal 3.
  • the desulfurization flux is injected to a position where the flow rate of the bath surface of the hot metal 3 in the horizontal direction is from 1.1 m/s to 11.9 m/s.
  • the position where the flow rate of the bath surface is in the above-described range is calculated in advance from the stirring conditions, such as the rotation speed of the stirring blade 5 and the spraying position of the desulfurization flux.
  • the desulfurization flux cut out by the rotary feeder 9 is top-added to the bath surface of the hot metal 3 through the injecting chute 13.
  • stirring of the hot metal 3 by the stirring blade 5 is performed until predetermined time passes. After that, the rotation speed is decreased until the rotation of the stirring blade 5 is stopped by the rotating device, and after the rotation is stopped, the stirring blade 5 is ascended by the elevating device. Next, slag generated by the desulfurization treatment floats to cover the bath surface of the hot metal 3, and becomes a rest state, so that the desulfurization treatment is completed. Accordingly, the hot metal 3 having a desired S concentration is produced.
  • an alumina-based flux or the like may be added to the desulfurization flux in addition to quicklime in which the total pore volume and the particle diameter are in the above-described ranges.
  • the desulfurization ability of quicklime is improved compared to quicklime out of the above-described ranges, and thus, equivalent or higher desulfurization efficiency can be obtained even when the additive amount of the flux is small.
  • the desulfurization flux according to the present invention does not contain a flux having at least one elution element of fluorine, sodium, and potassium.
  • the above-described embodiment is configured such that, when performing the desulfurization treatment, only the desulfurization flux is used as a refining agent, but the present invention is not limited to the foregoing example.
  • a deoxidizing agent such as aluminum dross powder and metal Al
  • the deoxidizing agent is stored in a hopper different from that of the desulfurization flux, and after being cut out from the hopper, may be added to the hot metal 3 through the injecting chute 13.
  • a flux such as fluorite and soda ash
  • the flux may be added after being mixed with the desulfurization flux, or the flux is stored in a hopper different from that of the desulfurization flux, and after being cut out from the hopper, may be added to the hot metal 3 through the injecting chute 13.
  • the above-described embodiment is configured such that one lance 10 is provided in the powder blasting means 6, but the present invention is not limited to the foregoing example. For example, two or more lances 10 may be provided.
  • the above-described embodiment is configured such that the desulfurization flux is used in the mechanical-stirring type hot metal desulfurizing method, but the present invention is not limited to the foregoing example.
  • the desulfurization flux is significantly increased as the reaction interface area is increased.
  • the effect is effective in not only the mechanical-stirring type hot metal desulfurizing method but also another desulfurizing method for performing desulfurization treatment of hot metal, such as an injection desulfurizing method. Therefore, the desulfurization flux according to the present invention may be used in a method of desulfurization treatment other than the mechanical-stirring type hot metal desulfurizing method.
  • Example 1 the desulfurization treatment was performed under multiple conditions using desulfurization flux in which the total pore volume, the particle diameter, and the ratio of quicklime were changed in the range of the above-described embodiment. Furthermore, in Example 1, the additive amount of the desulfurization flux was the constant amount, 5 kg/t, and the desulfurization treatment was performed under multiple conditions in which either method of the powder blasting method by the powder blasting means 6 or the top-adding method by the top-adding means 7 was used when adding the desulfurization flux. The adding conditions and the stirring conditions of the desulfurization flux were made the same as those of the first test indicated in Table 1.
  • the position of the bath surface to which the desulfurization flux is added was made the same.
  • the desulfurization efficiency was evaluated by calculating the desulfurization rate from the S concentration of the hot metal 3 measured before and after the desulfurization treatment.
  • Example 1 as comparative examples, the desulfurization treatment was performed under a condition using an injection desulfurizing method and under a condition in which the sum of the total pore volume and the average particle diameter of quicklime were different from those in the range of the above-described embodiment, and the desulfurization efficiency was evaluated in the same manner as the examples.
  • Table 2 indicates an evaluation result of a test level and desulfurization efficiency in Example 1.
  • the ratio (%) of quicklime indicates a ratio of quicklime having a pore diameter of from 0.5 ⁇ m to 10 ⁇ m and a particle diameter of 2 mm or less in quicklime that is the desulfurization flux.
  • 0.5-10 ⁇ m total pore volume (mL/g) indicates the total pore volume defined as the sum of the volumes of pores having a pore diameter of from 0.5 ⁇ m to 10 ⁇ m. It is to be noted that the average pore diameter of used quicklime was 0.1 ⁇ m to 0.3 ⁇ m.
  • Example 2 when using the powder blasting method as the adding method of the desulfurization flux, the influence of the stirring conditions on the desulfurization efficiency was searched.
  • the desulfurization flux was added using the powder blasting method in the same manner as Examples 1-1 to 1-15, and the desulfurization treatment was performed under multiple conditions in which the sum of the total pore volume, the particle diameter, and the stirring conditions of quicklime that is the desulfurization flux were changed.
  • Table 3 indicates an evaluation result of a test level and desulfurization efficiency in Example 2.

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Claims (9)

  1. Flux de désulfuration utilisé pour la désulfuration de métal chaud, comprenant :
    de la chaux vive dans laquelle un volume total de pores est supérieur ou égal à 0,1 mL/g, le volume total de pores étant défini en tant que somme des volumes des pores ayant un diamètre de pores allant de 0,5 µm à 10 µm, où
    la chaux vive est une chaux vive poudreuse ayant un diamètre moyen de particules de 210 µm à 500 µm, et est utilisée dans un procédé de désulfuration de métal chaud à agitation mécanique, le diamètre de pore étant calculé en utilisant l'équation de Washburn et le diamètre moyen de particule étant déterminé en tamisant le flux de désulfuration et étant calculé en utilisant l'équation (3) : D a = ∑ i w i / d i ∑ i w i
    Figure imgb0005
     dans laquelle Da indique le diamètre moyen de particule en mm, di indique un diamètre moyen de particule dans chacune des plages de diamètre des particules (valeur centrale du numéro de tamis) en mm, et wi indique une masse du flux de désulfuration sur chaque tamis en kilogramme.
  2. Flux de désulfuration selon la revendication 1, dans lequel la chaux vive a le diamètre moyen de particule allant de 230 µm à 500 µm déterminé avec l'équation (3) de la revendication 1.
  3. Flux de désulfuration selon la revendication 1 ou 2, exempt de l'un au moins parmi le fluor, le sodium et le potassium ajouté intentionnellement.
  4. Flux de désulfuration selon la revendication 1 ou 2, contenant uniquement la chaux vive.
  5. Procédé de désulfuration de métal chaud, dans lequel,
    lors de la réalisation d'un traitement de désulfuration de métal chaud dans un dispositif de désulfuration à agitation mécanique, un flux de désulfuration contenant de la chaux vive poudreuse dans laquelle un volume total de pores défini en tant que somme des volumes des pores ayant un diamètre de pores allant de 0,5 µm à 10 µm est supérieur ou égal à 0,1 mL/g et un diamètre moyen de particules va de 210 µm à 500 µm est utilisé déterminé avec l'équation (3) de la revendication 1.
  6. Procédé de désulfuration de métal chaud selon la revendication 5, dans lequel
    la chaux vive a le diamètre moyen de particule allant de 230 µm à 500 µm déterminé avec l'équation (3) de la revendication 1.
  7. Procédé de désulfuration de métal chaud selon la revendication 5 ou 6, dans lequel
    le dispositif de désulfuration à agitation mécanique inclut une lame d'agitation configurée pour agiter le métal chaud, et une lance supérieure configurée pour pulvériser le flux de désulfuration sur la surface d'un bain du métal chaud conjointement à un gaz porteur depuis le dessus du métal chaud, et
    lors de la réalisation du traitement de désulfuration du métal chaud, le métal chaud est agité en utilisant la lame d'agitation, et le flux de désulfuration est pulvérisé sur la surface du bain en utilisant la lance supérieure tandis que le métal chaud est en train d'être agité.
  8. Procédé de désulfuration de métal chaud selon la revendication 7, dans lequel,
    lorsque le flux de désulfuration est pulvérisé sur la surface du bain, un débit de la surface du bain au niveau d'une position sur laquelle est pulvérisé le flux de désulfuration dans une direction horizontale va de 1,1 m/s à 11,5 m/s.
  9. Procédé de production de métal chaud utilisant le procédé de désulfuration de métal chaud selon l'une quelconque des revendications 5 à 8.
EP16830368.3A 2015-07-24 2016-07-15 Agent de désulfuration, procédé de désulfuration de la fonte en fusion et procédé permettant de produire de la fonte en fusion Active EP3327150B1 (fr)

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JPS6256509A (ja) * 1985-09-04 1987-03-12 Kawasaki Steel Corp 生石灰を用いる溶銑脱硫方法
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JPH08268717A (ja) 1995-03-30 1996-10-15 Ishikawajima Harima Heavy Ind Co Ltd 脱硫用石灰石の前処理方法
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CN1368537A (zh) * 2001-02-09 2002-09-11 王铁钢 燃气高效脱硫剂
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JP4961787B2 (ja) * 2006-03-20 2012-06-27 Ｊｆｅスチール株式会社 溶銑の脱硫方法
JP5130663B2 (ja) * 2006-06-09 2013-01-30 Ｊｆｅスチール株式会社 溶融鉄の精錬方法
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EP3327150A4 (fr) 2018-05-30
CN107849623A (zh) 2018-03-27
TW201714828A (zh) 2017-05-01
EP3327150A1 (fr) 2018-05-30
CN107849623B (zh) 2019-06-18
JPWO2017018263A1 (ja) 2017-07-27
JP6156598B2 (ja) 2017-07-05
TWI616402B (zh) 2018-03-01
BR112018001331B1 (pt) 2021-09-28

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