EP2434025B1 - Procédé de désulfuration de fer fondu - Google Patents

Procédé de désulfuration de fer fondu Download PDF

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Publication number
EP2434025B1
EP2434025B1 EP10794262.5A EP10794262A EP2434025B1 EP 2434025 B1 EP2434025 B1 EP 2434025B1 EP 10794262 A EP10794262 A EP 10794262A EP 2434025 B1 EP2434025 B1 EP 2434025B1
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Prior art keywords
desulfurization
hot metal
desulfurization agent
slag
agent
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EP10794262.5A
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English (en)
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EP2434025A4 (fr
EP2434025A1 (fr
Inventor
Naoki Kikuchi
Masaki Koizumi
Takashi Yamauchi
Takehito Matsuda
Yasuo Kishimoto
Maki Iwasa
Yoshie Nakai
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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
    • 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

Definitions

  • the present invention relates to a method for desulfurizing hot metal (molten iron) by blowing a desulfurization agent from a top lance to the surface of hot metal that is being stirred with an impeller in a mechanical stirring desulfurization apparatus fitted with the impeller.
  • hot metal molten iron
  • a common hot metal desulfurization process uses a solid desulfurization agent such as calcium oxide (CaO).
  • a CaO-based desulfurization agent is blown from a blowing injection lance to hot metal contained in a hot metal transport container such as a torpedo car or a hot-metal ladle, or a mechanical stirring desulfurization process in which a stirring blade (also referred to as "impeller") is immersed in hot metal in a hot metal transport container and a CaO-based desulfurization agent is top-added to the hot metal that is being stirred with the rotating impeller.
  • a stirring blade also referred to as "impeller”
  • the desulfurization reaction using a CaO-basted desulfurization agent In the desulfurization reaction using a CaO-basted desulfurization agent, increasing the reaction interfacial area is effective in achieving high efficiency of the desulfurization reaction. Accordingly, the desulfurization reaction efficiency is enhanced by reducing the size in diameter of the desulfurization agent that is added.
  • the desulfurization agent supplied from a hopper is generally top-added into a treatment container such as a hot-metal ladle through a charging gate that is disposed above the treatment container.
  • PTL 1 proposes a method for desulfurizing hot metal using a mechanical stirring desulfurization apparatus, in which a desulfurization agent is blasted together with a carrier gas through a top lance onto the surface of hot metal that is being stirred with an impeller, thereby performing a desulfurization treatment.
  • a desulfurization agent is blasted together with a carrier gas through a top lance onto the surface of hot metal that is being stirred with an impeller, thereby performing a desulfurization treatment.
  • blasting a fine particulate desulfurization agent having excellent reactivity together with a carrier gas reduces the occurrence of scattering during the addition of the desulfurization agent and improves the addition yield of the desulfurization agent.
  • the fine particulate desulfurization agent has a large reaction interfacial area which promotes the desulfurization reaction, resulting in a markedly improved desulfurization rate.
  • PTL 1 describes that the horizontal distance R from the center of the impeller to the blasting position of the desulfurization agent preferably satisfies the relation: d / 3 ⁇ R ⁇ d / 2 + 1 / 3 ⁇ D ⁇ d (Formula (2), wherein D is the inner diameter of the treatment container containing the hot metal, and d is the diameter of the impeller) (paragraphs [0017] to [0020]).
  • a substantial increase in reaction interfacial area is important in order to improve the desulfurization reaction efficiency per unit mass of the desulfurization agent.
  • a powder desulfurization agent is blasted together with a carrier gas from a top lance onto the hot metal surface in order to avoid the aggregation of the desulfurization agent which can be a problem in top-adding the desulfurization agent from above the treatment container as well as to increase the substantial reaction interfacial area.
  • the term aggregation refers to a phenomenon in which the particles of the added desulfurization agent combine together into spherical masses within or on the hot metal. It is necessary that the aggregation be suppressed in order to substantially increase the reaction interfacial area.
  • Adding a desulfurization agent of finer particle size is a possible approach for suppressing the aggregation and reducing the size of the aggregates.
  • a desulfurization agent that has been excessively reduced in size suffers a low addition yield even when the agent is blasted from a top lance.
  • PTL 1 does not specify the size in diameter of the desulfurization agent and thus it must be said that it is difficult to add the desulfurization agent with a high addition yield as well as to achieve a stable desulfurization treatment with suppressed aggregation of the added desulfurization agent.
  • hot metal is often subjected to a desiliconization treatment or a dephosphorization treatment prior to the desulfurization treatment.
  • the desulfurization treatment is carried out after the slag produced in the desiliconization treatment or the dephosphorization treatment is removed.
  • the slag formed in the precedent step cannot be removed completely and a portion of the slag generated in the precedent step is inevitably mixed in the hot metal in variable amounts. Since both the desiliconization treatment and the dephosphorization treatment are refining treatments utilizing an oxidation reaction, the slag mixed in the hot metal is highly oxidized.
  • This contaminant slag is incorporated in the hot metal when the hot metal is stirred with an impeller, and is reduced with carbon present in the hot metal. This phenomenon is the same as if oxygen is added to the hot metal, and thus the desulfurization treatment that is a reductive refining treatment is adversely affected. That is, the mixed slag inhibits the desulfurization reaction. This phenomenon is more influential in the blowing addition of a desulfurization agent through a top lance than in the top addition.
  • the reason for this is that in the top addition method, the mixed slag and the desulfurization agent (the top-added flux) aggregate on the hot metal surface with the result that the mixed slag is not directly incorporated into the hot metal and thus is less likely to inhibit the desulfurization reaction, whilst blowing the desulfurization agent through a top lance permits the agent (the top-blown flux) to be present in so small an amount on the hot metal surface that the mixed slag is more likely to be incorporated directly.
  • the invention has been made in view of the problems described above. It is therefore an object of the invention to provide a method for desulfurizing hot metal by blowing a desulfurization agent from a top lance onto the surface of hot metal that is being stirred with an impeller in a mechanical stirring desulfurization apparatus fitted with the impeller, the method being capable of adding the desulfurization agent with a high addition yield while preventing the aggregation of the added desulfurization agent, and thereby desulfurizing the hot metal stably and highly efficiently.
  • JP-A-2008 050659 discloses a method according to the preamble of claim 1.
  • the present invention is directed to a method for desulfurizing hot metal using a mechanical stirring desulfurization apparatus, the method including the steps recited in claim 1.
  • the desulfurization agent is blasted after a desulfurization slag that has been generated beforehand in a desulfurization treatment with a CaO-based desulfurization agent has been added onto the surface of the hot metal and thereafter the stirring of the hot metal with the impeller has been initiated.
  • the size in diameter of the CaO-based desulfurization agent that is blown from a top lance is specified to be in the range of 30 to 400 ⁇ m. Since the desulfurization agent does not contain fine particles that are scattered easily, the scattering during the blowing of the desulfurization agent is prevented. In addition, because the desulfurization agent does not contain large particles having a small reaction interfacial area and further because the aggregation of the added desulfurization agent is prevented, a large desulfurization reaction interfacial area is obtained to allow for stable and highly efficient desulfurization treatment. As a result, the methods of the invention provide industrial advantages such as the reduction of consumption of the desulfurization agent and the associated reduction of the amount of slag.
  • the present inventors have carried out hot metal desulfurization tests using a mechanical stirring desulfurization apparatus.
  • the desulfurization of hot metal was tested using an actual mechanical stirring desulfurization apparatus by blasting a CaO-based desulfurization agent together with a carrier gas through a top lance while changing the size in diameter of the desulfurization agent to determine the optimum range of the size in diameter of the desulfurization agent to be added.
  • a schematic view of the mechanical stirring desulfurization apparatus used in the desulfurization tests is shown in Fig. 1 .
  • a hot-metal ladle 2 which contains hot metal 3 tapped from a blast furnace has been mounted on a carrying truck 1 and has been transported into the mechanical stirring desulfurization apparatus.
  • the mechanical stirring desulfurization apparatus has a refractory impeller 4 that can be immersed or buried in the hot metal 3 contained in the hot-metal ladle 2 and can be rotated to stir the hot metal 3.
  • the impeller 4 is configured so as to be capable of ascending and descending in a substantially vertical direction by an elevating device (not shown) and so as to be rotatable about a shaft 4a by a rotating device (not shown).
  • the mechanical stirring desulfurization apparatus is fitted with a top lance 5 for blasting a CaO-based desulfurization agent 7 onto the hot metal 3 in the hot-metal ladle 2.
  • the top lance 5 is connected with a supply unit that is composed of a dispenser 8 containing the powdery CaO-based desulfurization agent 7 and a supplying device 9 for supplying predetermined amounts of the agent from the dispenser 8.
  • the mechanical stirring desulfurization apparatus is configured such that the powdery CaO-based desulfurization agent 7 together with a carrier gas 10 can be supplied from the top lance 5 at the desired time.
  • the carrier gas 10 may be a reducing gas, an inert gas or a non-oxidative gas.
  • a dust hood 6 is provided above the hot-metal ladle 2, covering the hot-metal ladle 2. Exhaust gas and dust that are generated during the treatment are suctioned by a dust collector (not shown) through an exhaust gas duct (not shown) attached to the dust hood 6.
  • a dust collector not shown
  • an exhaust gas duct not shown
  • the shaft 4a of the impeller 4 and the top lance 5 are provided so as to penetrate the dust hood 6 and to be vertically movable.
  • the size in diameter of the desulfurization agent is defined based on sieving. Even if a particle has a spindle shape with a longer diameter that is larger than the opening of the sieve, the particle is defined as being smaller than the opening of the sieve as long as it can pass through the sieve. In the desulfurization tests in which the diameter of the desulfurization agent was changed to various diameters, the size in diameter of the CaO-based desulfurization agent 7 had been adjusted to be the average size in diameter ⁇ 10%.
  • the hot-metal ladle 2 containing 300 tons of the hot metal 3 at 1280 to 1320°C was mounted on the carrying truck 1.
  • the truck 1 carrying the hot-metal ladle 2 was positioned such that the impeller 4 would be located substantially at the center of the hot-metal ladle 2.
  • the impeller 4 was then lowered and immersed in the hot metal 3. After the impeller 4 was immersed in the hot metal 3, rotation of the impeller 4 was initiated and the rotational speed was increased to a predetermined rotational speed (120 rpm).
  • the supplying device 9 was activated to blow the CaO-based desulfurization agent 7 contained in the dispenser 8, together with the carrier gas, from the top lance 5 onto the surface of the hot metal 3, thereby performing desulfurization treatment.
  • the top lance 5 was located at a position such that the distance (A) was equal to (1/2) ⁇ D wherein A was the horizontal distance (m) from the center of the hot-metal ladle 2 to the center of the top lance 5, and D was the inner radius (m) of the hot-metal ladle 2 that was the treatment container, and further such that the distance from the still, namely, unruffled surface of the hot metal 3 in the hot-metal ladle to the tip of the top lance 5 (also referred to as "lance height") was 1.0 m.
  • the distance (A) was larger than the impeller radius (R) (m).
  • the top lance 5 was located at this position so as to face down in the vertical direction.
  • the carrier gas was nitrogen gas.
  • the average size in diameter of the desulfurization slag measured herein is a weighted average size in diameter determined using the method described in " Huntai Kougaku Sousho (Powder Engineering Library), Vol. 1, Huntai no Kiso Bussei (Basic Properties of Powder), edited by The Society of Powder Technology, Japan, published from THE NIKKAN KOGYO SHIMBUN, LTD., pp. 8-12 ".
  • the distribution references r (0 (number), 1 (length), 2 (area) and 3 (volume) that are described in the literature, the reference 1 is adopted in the invention. (Namely, the length distribution is adopted as the distribution reference.)
  • Fig. 2 The relationship between the size in diameter of the CaO-based desulfurization agent (horizontal axis: mm) and the scatter ratio (vertical axis: %) is shown in Fig. 2 .
  • Fig. 3 shows the relationship between the size in diameter of the CaO-based desulfurization agent and the average size in diameter of the desulfurization slag (vertical axis: mm). As shown in Figs.
  • the scatter ratio markedly increased to 80% or more when the size in diameter of the desulfurization agent was less than 30 ⁇ m; on the other hand, although the average size in diameter of the desulfurization slag increased with increasing size in diameter of the desulfurization agent, the increase in the average size in diameter of the desulfurization slag was small when the size in diameter of the desulfurization agent was 400 ⁇ m or less. When the size in diameter of the desulfurization agent was more than 400 ⁇ m, the scatter ratio was low but the average size in diameter of the desulfurization slag was so large that an increase in reaction interfacial area was not expected.
  • the relationship between the size in diameter of the CaO-based desulfurization agent and the sulfur concentration in the desulfurized hot metal (vertical axis: mass %) is shown in Fig. 4 .
  • the size in diameter of the desulfurization agent on the horizontal axis in Figs. 2 to 4 was the average size in diameter of the desulfurization agent that had been classified in terms of size in diameter so as to have the average size in diameter ⁇ 10%.
  • the method for desulfurizing hot metal using a mechanical stirring desulfurization apparatus includes blasting a CaO-based desulfurization agent having a size in diameter of 30 to 400 ⁇ m, together with a carrier gas, through a top lance onto the surface of hot metal that is being stirred with an impeller to desulfurized the hot metal.
  • the average sulfur concentration in the desulfurized hot metal was 0.0007 mass % (variations: 0.0006 to 0.0015 mass %)
  • the scatter ratio of the desulfurization agent was 5 to 10%
  • the size in diameter of the desulfurization slag was 5 to 10 mm.
  • the desulfurization agent formed into a giant mass in the vicinity of the position at which it was added. Consequently, the size in diameter of the desulfurization slag became excessively large, and the desulfurization agent attached to the shaft 4a of the impeller 4 and its performance in the desulfurization reaction deteriorated.
  • the position was outside the above preferred range ((1/2) ⁇ D ⁇ A ⁇ D)
  • the scatter ratio of the desulfurization agent was increased and the size in diameter of the desulfurization slag became larger as the position became further outside.
  • D is the inner radius (m) of the treatment container containing the hot metal
  • R is the radius (m) of the impeller
  • A is the horizontal distance (m) from the center of the treatment container to the center of the top lance.
  • the above conditions and so on are preferably regulated so as to control the scatter ratio of the desulfurization agent to not more than 40% and the size in diameter of the desulfurization slag to not more than 14 mm.
  • the impeller 4 (and the rotational shaft) is not necessarily positioned at the center of the treatment container and may be positioned eccentrically without any problems in stirring.
  • the size of the impeller and the treatment container may be determined appropriately in accordance with the amount of hot metal to be treated (generally 250 to 350 tons) and the desired level of stirring.
  • R is preferably D/3 or more from the viewpoint of stirring.
  • the carrier gas for blowing the CaO-based desulfurization agent 7 through the top lance 5 may be a reducing gas, an inert gas or a non-oxidative gas.
  • the reducing gases include hydrocarbon gases.
  • An example of the inert gases is argon gas.
  • An example of the non-oxidative gases is nitrogen gas.
  • the CaO-based desulfurization agent 7 may be any substance that is based on calcium oxide (CaO) or, in other words, contains CaO at not less than 50 mass %.
  • CaO calcium oxide
  • burned lime and limestone or the like may be used singly or as a mixture with Al 2 O 3 or CaF 2 or the like as an agent which promotes melting.
  • dolomite (CaO-MgO) or the like may be used as the CaO-based desulfurization agent 7.
  • Increasing the Al 2 O 3 proportion in, for example, a CaO-based, CaO-Al 2 O 3 desulfurization agent 7 (containing 5 mass % or less of residual impurities) results in an increased amount of the liquid phase.
  • the Al 2 O 3 proportion has an appropriate range in the CaO-Al 2 O 3 desulfurization agent through the study of the present inventors-
  • the metallic aluminum added herein (for example, aluminum contained in aluminum ash as the raw material) is regarded as an active ingredient that is the Al 2 O 3 source in the CaO-Al 2 O 3 -based desulfurization agent.
  • a desulfurization slag have been collected beforehand which has been produced in a desulfurization treatment with a CaO-based desulfurization agent prior to the desulfurization treatment.
  • This collected desulfurization slag is added onto the hot metal in the hot-metal ladle 2 prior to the initiation of the stirring of the hot metal 3 with the impeller 4 and thereafter the hot metal 3 is stirred with the impeller 4 to incorporate the added desulfurization slag into the hot metal.
  • the collected desulfurization slag is top-added onto the hot metal 3 that is being stirred with the impeller 4, thereby incorporating the added desulfurization slag into the hot metal.
  • the CaO-based desulfurization agent 7 is added from the top lance 5.
  • the reason why the addition of the CaO-based desulfurization agent 7 from the top lance 5 is initiated after the desulfurization slag is incorporated into the hot metal is that the powdery CaO-based desulfurization agent 7 added from the top lance 5 can be efficiently incorporated into the hot metal. That is, the added desulfurization slag remains on the surface of the hot metal for some time even though the hot metal 3 is being stirred with the impeller 4, and the presence of such a slag inhibits the incorporation of the desulfurization agent from the top lance 5 into the hot metal 3.
  • the time required for the added collected slag to be incorporated into the hot metal varies in accordance with the facility or operation conditions, but the incorporation can be easily visually confirmed.
  • hot metal tapped from a blast furnace is initially subjected to a desiliconization treatment and/or a dephosphorization treatment.
  • the slag containing iron oxide that has been generated in the treatment is discharged.
  • blast furnace slag or desiliconization slag generated at a blast furnace runner finds its way into the hot-metal ladle 2 and comes to be present in the desulfurization treatment.
  • the desulfurization reaction is adversely affected by the components in the slags that have come to be present in the desulfurization treatment step, namely iron oxide contained in a desiliconization agent and a dephosphorization agent, and SiO 2 contained in the desiliconization slag, the dephosphorization slag and the blast furnace slag.
  • Iron oxide is disadvantageous for the desulfurization reaction that is a reduction reaction.
  • SiO 2 in combination with CaO that is the main component of the desulfurization agent lowers the basicity in the reaction site and decreases the desulfurization performance.
  • the residual iron oxide-containing slag or the residual SiO 2 -containing slag is mixed with the desulfurization slag, and the desulfurization slag adheres to the surface of the iron oxide-containing slag or the SiO 2 -containing slag with the result that the residual slag is coated (sort of) with the desulfurization slag.
  • the addition of the previously collected desulfurization slag prevents the supply of oxygen from the residual iron oxide-containing slag to the hot metal 3 or prevents the residual SiO 2 -containing slag from lowering the basicity in the reaction site. As a result, the residual slags are prevented from inhibiting the desulfurization reaction that is a reduction reaction.
  • the addition of the desulfurization slag is more effective in the case where the desulfurization agent is blown from the top lance 5 to the hot metal surface.
  • the present inventors have confirmed that when the desulfurization treatment is performed after a desiliconization treatment, the addition of the previously collected desulfurization slag into the hot-metal ladle before starting the stirring of the hot metal 3 with the impeller 4 results in a desulfurization slag in which the central portion has a high concentration of iron oxide and is based on SiO 2 , and the peripheral portion is based on CaO.
  • the CaO-based desulfurization agent 7 that is blown from the top lance 5 has a size in diameter controlled within the range of 30 to 400 ⁇ m and thus can be prevented from scattering during the blowing.
  • the aggregation of the added desulfurization agent is prevented and the desulfurization reaction interfacial area is increased, thereby realizing stable and highly efficient desulfurization treatment.
  • Hot metal was desulfurized using a mechanical stirring desulfurization apparatus illustrated in Fig. 1 and CaO-20 mass % Al 2 O 3 as the CaO-based desulfurization agent (amount of added desulfurization agent: 7 kg/hot metal-ton). The results are described below. Nitrogen gas was used as the carrier gas for the CaO-based desulfurization agent.
  • the impeller had four non-inclined blades. The impeller was located substantially at the center of the hot-metal ladle.
  • the operation conditions were as follows. Four levels of the size in diameter of the CaO-based desulfurization agent were adopted: 20 ⁇ m or less (Comparative Example 1), 500 to 1000 ⁇ m (Comparative Example 2), 200 to 400 ⁇ m (Inventive Example 1) and 30 to 100 ⁇ m (Inventive Examples 2 to 5).
  • Comparative Examples 1 and 2 and Inventive Examples 1 and 2 the top lance was located at a position satisfying Equation (2) described hereinabove to examine the influence of the size in diameter of the desulfurization agent on the desulfurization reaction.
  • the top lance was located at a position failing to satisfy Equation (2) described hereinabove to examine the influence of the position of the top lance on the desulfurization reaction.
  • the top lance was located at a position satisfying Equation (2) described hereinabove and a previously collected desulfurization slag was added onto the hot metal before the impeller was rotated.
  • the operation conditions other than the size in diameter of the CaO-based desulfurization agent and the position of the top lance were in accordance with Table 1. Each test consisted of 100 charges (ch). The operation conditions and the results are described in Table 2.
  • Inventive Examples 1 and 2 achieved a lower average sulfur concentration in the desulfurized hot metal than in Comparative Examples 1 and 2.
  • Inventive Examples 3 and 4 in which the position of the top lance was outside the preferred range according to the present invention
  • Inventive Example 2 in which the top lance was located in the preferred range of the invention
  • Inventive Example 2 was found to achieve higher desulfurization efficiency.
  • Inventive Example 5 which involved the recycling of desulfurization slag resulted in a further lowered average sulfur concentration in the desulfurized hot metal with smaller variations.
  • PTL 1 considers the locating position for a top lance from the viewpoint of the scattering or dispersion of a desulfurization agent into hot metal.
  • a desulfurization treatment was carried out under various conditions described in Table 3. The operation conditions other than those shown in Table 3 were similar to those in EXAMPLE 1. Each test consisted of 100 charges.
  • a desulfurization treatment was carried out under various conditions shown in Table 4. The results are described in Table 4. The operation conditions other than those shown in Table 4 were similar to those in EXAMPLE 1.
  • Inventive Examples 12 to 16 shown in Table 4 ascertained the influence of the stirring time starting from the addition of recycled desulfurization slag (collected slag) beforehand to the initiation of the addition of the desulfurization agent through the top lance.
  • Inventive Examples 17 to 22 the influence of the amount of Al 2 O 3 mixed in the CaO-Al 2 O 3 -based desulfurization agent was ascertained.
  • Inventive Examples 23 and 24 ascertained the influence of the carrier gas used for the desulfurization agent.
  • the methods of the present invention realize highly efficient desulfurization treatment, namely desulfurization to a sulfur concentration of, for example, 0.003 mass %, with small variations of the results and with stability.
  • the methods provide industrial advantages such as the reduction of consumption of the desulfurization agent and the associated reduction of the amount of slag.

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  • 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)

Claims (2)

  1. Procédé de désulfuration d'un métal chaud (3) en utilisant un appareil de désulfuration par agitation mécanique, le procédé comprenant la projection d'un agent de désulfuration (7) à base de CaO présentant une dimension en diamètre de 30 à 400 µm, avec un gaz vecteur (10), via une lance supérieure (5) sur la surface de métal chaud (3) qui est agitée avec une pâle (4) pour désulfurer le métal chaud (3), dans lequel la lance supérieure (5) est ménagée de manière à être tournée vers le bas en direction verticale ;
    caractérisé en ce que
    le rayon R de la pâle (4) satisfait la relation de l'Équation (1) ci-dessous par rapport au rayon interne D du récipient de traitement, et la distance horizontale A depuis le centre du récipient de traitement au centre de la lance supérieure (5) satisfait la relation de l'Équation (2) ci-dessous par rapport au rayon intérieur D et au rayon R de la pâle (4) : R ≤ 1 / 2 × D
    Figure imgb0008
     R ≤ A ≤ 1 / 2 × D
    Figure imgb0009
  2. Procédé de désulfuration de métal chaud (3) selon la revendication 1, dans lequel l'agent de désulfuration (7) est projeté après qu'un laitier de désulfuration, qui a été généré auparavant dans un traitement de désulfuration avec un agent de désulfuration (7) à base de CaO, a été ajouté à la surface du métal chaud (3) et qu'ensuite l'agitation du métal chaud (3) avec la pâle (4) a été entrepris.
EP10794262.5A 2009-06-30 2010-06-29 Procédé de désulfuration de fer fondu Active EP2434025B1 (fr)

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JP2009155148 2009-06-30
JP2009294022 2009-12-25
JP2010147015A JP5195833B2 (ja) 2009-06-30 2010-06-29 溶銑の脱硫方法
PCT/JP2010/061366 WO2011002094A1 (fr) 2009-06-30 2010-06-29 Procédé de désulfuration de fer fondu

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EP2434025A4 EP2434025A4 (fr) 2016-12-14
EP2434025B1 true EP2434025B1 (fr) 2018-03-21

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JP5668641B2 (ja) * 2011-08-22 2015-02-12 Ｊｆｅスチール株式会社 溶銑の脱硫方法
JP6237293B2 (ja) * 2014-02-06 2017-11-29 新日鐵住金株式会社 溶銑の脱硫処理方法
KR101597263B1 (ko) 2014-04-04 2016-02-24 주식회사 포스코 용융금속 정련장치 및 그 정련방법
KR101602835B1 (ko) 2014-05-26 2016-03-11 주식회사 포스코 용융금속 정련장치 및 그 정련방법
CN104928440B (zh) * 2015-07-20 2017-05-10 上海信孚环保技术工程有限公司 一种节省脱硫剂的铁水脱硫装置及其应用
JP6402762B2 (ja) * 2015-10-05 2018-10-10 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
JP6369516B2 (ja) * 2015-10-05 2018-08-08 Ｊｆｅスチール株式会社 機械攪拌式溶銑脱硫方法
KR102290861B1 (ko) * 2017-01-19 2021-08-17 제이에프이 스틸 가부시키가이샤 용강의 탈황 처리 방법 및 탈황제
CN108486307A (zh) * 2018-04-17 2018-09-04 中冶南方工程技术有限公司 一种基于kr脱硫站的转炉除尘灰铁回收系统及方法
KR102034264B1 (ko) * 2018-08-03 2019-10-17 주식회사 포스코 용선 처리 장치 및 용선 처리 방법
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EP2434025A4 (fr) 2016-12-14
BRPI1015360A2 (pt) 2016-05-10
EP2434025A1 (fr) 2012-03-28
WO2011002094A1 (fr) 2011-01-06
KR101366720B1 (ko) 2014-02-24
CN102471814B (zh) 2016-06-15
JP5195833B2 (ja) 2013-05-15
BRPI1015360B1 (pt) 2021-10-26
KR20120026623A (ko) 2012-03-19
JP2011149087A (ja) 2011-08-04

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