WO2015129173A1 - 溶銑の脱硫方法および脱硫剤 - Google Patents
溶銑の脱硫方法および脱硫剤 Download PDFInfo
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- WO2015129173A1 WO2015129173A1 PCT/JP2015/000561 JP2015000561W WO2015129173A1 WO 2015129173 A1 WO2015129173 A1 WO 2015129173A1 JP 2015000561 W JP2015000561 W JP 2015000561W WO 2015129173 A1 WO2015129173 A1 WO 2015129173A1
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- Prior art keywords
- desulfurization
- hot metal
- agent
- desulfurizing agent
- calcium aluminate
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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
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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
- 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
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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
- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Definitions
- the present disclosure relates to a hot metal desulfurization method and a desulfurization agent.
- the hot metal discharged from the blast furnace contains a high concentration of sulfur (S) due to raw materials used in the blast furnace such as coke.
- Sulfur is basically a component that adversely affects the quality of steel. For this reason, in a steelmaking process, hot metal desulfurization and molten steel desulfurization are performed according to the required quality of steel.
- a method of adding a desulfurizing agent mainly composed of inexpensive quick lime (CaO) and stirring and mixing is used.
- a fouling agent is used to promote hatching of the added desulfurizing agent.
- a fluorite (CaF 2 ) -based fossilizing agent is known as a fossilizing agent excellent in promoting the hatching of a desulfurizing agent.
- fluorine (F) contained in fluorite is an element for which there is a concern that it may adversely affect the environment and the human body and an emission standard is provided. For this reason, when recycling slag after desulfurization treatment using fluorite, elution of fluorine from recycled products becomes a problem, and therefore, a desulfurization agent having a high desulfurization ability and containing no fluorine component is required. .
- Patent Document 1 discloses a steel additive containing a CaO.Al 2 O 3 -based mineral (calcium aluminate) having a low melting point as a desulfurization agent not containing a fluorine component used in desulfurization.
- Patent Document 2 discloses calcium aluminate having a mass ratio of CaO: 40 to 60% and Al 2 O 3 : 60 to 40% as a desulfurization agent not containing fluorine, and the above calcium aluminum.
- a desulfurization agent in which a nate and quicklime (CaO) are mixed is disclosed.
- Patent Document 1 since the steel additive disclosed in Patent Document 1 has a high mixing ratio of 100% of calcium aluminate in the desulfurization agent, which has a high production cost, the cost for desulfurization treatment has been increased. Further, since the steel additive disclosed in Patent Document 2 has a high mixing cost of 77% to 100% in the calcium aluminate desulfurization agent, the cost for desulfurization treatment is the same as in Patent Document 1. Was inviting.
- the present invention has been made paying attention to the above-described problem, and a hot metal desulfurization method and desulfurization capable of reducing the cost of desulfurization treatment while obtaining a predetermined desulfurization ability without using fluorine.
- the purpose is to provide an agent.
- calcium aluminate and quicklime are mixed into the hot metal with a mass concentration ratio of Al 2 O 3 / (Al 2 O 3 + CaO) is greater than 0 0.20 or less, and desulfurization process in which the mixing ratio of the calcium aluminate is added a desulfurizing agent which is a mixture such that less 0Mass% ultra 75 mass% in the hot metal is provided.
- calcium aluminate and quicklime are mixed at a mass concentration ratio of Al 2 O 3 / (Al 2 O 3 + CaO) of more than 0 and 0.20 or less, and the mixing ratio of calcium aluminate.
- the hot metal desulfurization method and the desulfurization agent according to the present invention it is possible to reduce the cost required for the desulfurization treatment while obtaining a predetermined desulfurization ability without using fluorine.
- the present inventors focused on the influence of the ratio of alumina contained in calcium aluminate in the desulfurizing agent on the desulfurization ability, and mixed quick lime (CaO) and calcium aluminate at various mixing ratios.
- the desulfurizing agent prepared in this manner was introduced into the hot metal, and the produced slag was examined for the alumina ratio in the slag and the S concentration (mass%) in the slag.
- the alumina ratio is the ratio calculated from mass% of CaO and Al 2 O 3 in the slag represented by formula (1).
- (% Al 2 O 3 ) represents mass% of Al 2 O 3 in the slag
- (% CaO) represents mass% of CaO in the slag.
- FIG. 1 shows the results of an investigation regarding the alumina ratio in the slag produced from the above desulfurizing agent and the S concentration in the slag.
- the S concentration in the slag is as high as 2% or more in the region where the alumina ratio in the slag is more than 0% and 20% or less.
- the alumina ratio is as low as more than 0% and 20% or less, calcium aluminate and quicklime are uniformly mixed in advance to prevent uneven distribution of calcium aluminate. It was inferred that the effect of improving the desulfurization ability of lime was obtained efficiently due to the presence of the material evenly around.
- the region where the alumina ratio in the desulfurizing agent is more than 0% and not more than 20% corresponds to the region where the calcium aluminate ratio in the desulfurizing agent is more than 0% and not more than 30%. That is, the inventors of the present invention, in a region where the ratio of calcium aluminate in the desulfurizing agent is low, the effect of calcium aluminate to lower the melting point of the desulfurizing agent by alumina and the liquid produced by melting calcium aluminate. It was conceived that the effect of improving the dissolution rate of the desulfurizing agent by the phase was obtained, and the melting of the desulfurizing agent lime was effectively promoted.
- the alumina ratio in the slag exceeds 20%, it has been clarified that the S concentration in the slag rapidly decreases and the S concentration in the slag becomes less than 2%. This is because the alumina reduces the S distribution ratio in the slag (ratio of the S concentration in the slag to the S concentration in the hot metal) compared to the effect of improving the liquid phase ratio by lowering the melting point of the desulfurizing agent to which alumina is added. It was inferred that the large size had an effect.
- the present inventors have found that the desulfurization agent having a low alumina ratio and a low calcium aluminate ratio qualitatively has a lower liquid phase ratio than the desulfurization agent having a high alumina ratio, but S in the slag. Since the distribution ratio becomes high, it was clarified that melting of lime can be effectively promoted by uniformly dispersing alumina.
- the present inventors set the mass concentration ratio Al 2 O 3 / (Al 2 O 3 + CaO) of the desulfurizing agent to be more than 0 and 0.20 or less, so that the mixing ratio of calcium aluminate is low, and the liquid phase Even in the case of a desulfurization agent having a low rate improvement effect, the inventors have conceived that a predetermined desulfurization ability can be obtained, and have made the present invention.
- the predetermined desulfurization ability is at least equivalent to that of a desulfurization agent using fluorite or a desulfurization agent having a high mixing ratio of calcium aluminate.
- the desulfurization method of the hot metal 16 which concerns on the 1st Embodiment of this invention is demonstrated.
- the desulfurization method of the hot metal 16 according to the first embodiment is a mechanical stirring type desulfurization method using the mechanical stirring type desulfurization apparatus 20a.
- the structure of the mechanical stirring desulfurization apparatus 20a used with the desulfurization method of the hot metal 16 which concerns on 1st Embodiment is demonstrated.
- the mechanical stirring type desulfurization apparatus 20a includes an impeller 21 made of a refractory provided at one end of an impeller shaft 211, a desulfurization agent addition unit 24 for storing the desulfurization agent 18 and adding the desulfurization agent 18 to the molten iron 16, a dust collection hood 22, and an exhaust.
- the impeller 21 is a stirring blade that stirs the hot metal 16 by being immersed and buried in the hot metal 16 accommodated in the hot metal pan 14 loaded on the carriage 12 and rotating. Further, the impeller 21 is configured to be vertically movable and rotatable about the impeller shaft 211 as a rotation axis by a lifting device and a rotating device (not shown) provided on the other end side of the impeller shaft 211.
- the desulfurizing agent adding unit 24 adds the desulfurizing agent 18 to the hot metal 16, stores a hopper 241 for storing the desulfurizing agent 18, a cutting device 242 for cutting the desulfurizing agent 18 from the hopper 241, and the hot desulfurizing agent 18. 16 and an input chute 243 to be input to No. 16.
- the desulfurization agent 18 has a mass concentration ratio Al 2 O 3 / (Al 2 O 3 + CaO) indicating a ratio of alumina in the desulfurization agent 18 of more than 0 and 0.20 or less, and a mixing ratio of calcium aluminate in the desulfurization agent 18 Is produced by uniformly mixing calcium aluminate and quicklime so that the amount becomes more than 0 mass% and not more than 75 mass%.
- the inventors of the present invention set the alumina ratio of the desulfurizing agent 18 to 20% or less and the mixing ratio of the calcium aluminate in the desulfurizing agent 18 to 0 mass% or more and 30 mass% or less in the slag.
- the present inventors set the alumina ratio of the desulfurizing agent 18 to 20% or less, so that the mixing ratio of the calcium aluminate in the desulfurizing agent 18 is more than 30 mass% and more than 75 mass%. It was confirmed that the predetermined desulfurization ability was obtained also in the following ranges.
- Calcium aluminate is produced by mixing quick lime and alumina at a predetermined mass ratio, premelting and grinding.
- the predetermined mass ratio of calcium aluminate quicklime and alumina is a mass ratio calculated so that the ratio of alumina in the desulfurizing agent 18 and the mixing ratio of calcium aluminate satisfy all the above conditions.
- the mass ratio is represented by CaO / Al 2 O 3 .
- the mass ratio CaO / Al 2 O 3 of calcium aluminate is calculated as 3/2.
- the dust collection hood 22 is provided so as to cover the upper part of the hot metal ladle 14.
- the exhaust duct 23 is attached to the dust collection hood 22.
- the mechanical stirring type desulfurization apparatus 20 a causes the dust collector (not shown) connected to the exhaust duct 23 to suck the exhaust gas and dust generated during the processing through the exhaust duct 23.
- what kind of hot metal may be used for the hot metal 16 of the first embodiment. That is, for the hot metal 16, hot metal that has been discharged from the blast furnace, hot metal in which at least one treatment of desiliconization or dephosphorization has been performed in advance after the extraction is used.
- the addition amount of the desulfurizing agent 18 is determined from various conditions such as the desulfurizing ability of the desulfurizing agent 18, the component / temperature of the hot metal 16, the target S concentration after treatment, and the treatment time. Thereafter, when stirring for a predetermined time is performed, the rotation of the impeller 21 is stopped, the impeller 21 is raised, and the desulfurization process is completed.
- the desulfurization method of the hot metal 16 according to the first embodiment is the desulfurization method using the mechanical stirring desulfurization apparatus 20a in which the desulfurization agent 18 is added.
- a mixture obtained by mixing so that Al 2 O 3 / (Al 2 O 3 + CaO) is more than 0 and 0.20 or less and the mixing ratio of calcium aluminate is more than 0 mass% and 75 mass% or less is used as the desulfurization agent 18. For this reason, it is possible to efficiently obtain the effect of improving the dissolution rate of the desulfurizing agent 18 by the liquid phase generated by lowering the melting point of the desulfurizing agent 18 with alumina and melting the calcium aluminate.
- the mechanical stirring type desulfurization apparatus 20b of the second embodiment is different from the mechanical stirring type desulfurization apparatus 20a of the first embodiment in the configuration of the desulfurizing agent addition unit 25, but the other configuration is the first implementation. It is the same as the form. That is, the mechanical stirring desulfurization apparatus 20b includes an impeller 21, a dust collection hood 22, and an exhaust duct 23, as in the first embodiment. Furthermore, the mechanical stirring type desulfurization apparatus 20b includes a desulfurization agent addition unit 25 that stores the desulfurization agent 18 and adds it by top blowing.
- the desulfurization agent addition unit 25 includes a dispenser 251 that stores the desulfurization agent 18, a cutout device 252 that cuts out the desulfurization agent 18 from the dispenser 251, a powder supply pipe 253 that supplies the cut out desulfurization agent 18 and the transport gas G. And an upper blowing lance 254 that is connected to the tip of the powder supply pipe 253 and injects the desulfurizing agent 18 onto the molten iron 16 together with the conveying gas G.
- the carrier gas G can be any one or more of an inert gas, a non-oxidizing gas, and a reducing gas, and may be nitrogen or argon, for example.
- the desulfurizing agent 18 is the same as the desulfurizing agent 18 according to the first embodiment.
- the addition amount of the desulfurizing agent 18 is determined from various conditions such as the desulfurizing ability of the desulfurizing agent 18, the component / temperature of the hot metal 16, the target S concentration after treatment, and the treatment time. Thereafter, when stirring for a predetermined time is performed, the rotation of the impeller 21 is stopped, the impeller 21 is raised, and the desulfurization process is completed.
- the desulfurization method of the hot metal 16 according to the second embodiment is the desulfurization method using the mechanical stirring type desulfurization apparatus 20b in which the desulfurization agent 18 is added by blowing, and the calcium aluminate and the quick lime are mass-concentrated.
- Agent 18 is used. For this reason, similarly to the first embodiment, it is possible to efficiently obtain the effect of improving the dissolution rate of the desulfurization agent by the liquid phase generated by lowering the melting point of the desulfurization agent by alumina and melting the calcium aluminate.
- the desulfurization method of the hot metal 16 according to the second embodiment efficiently adds the desulfurization agent 18 having a small particle size to the addition of the desulfurization agent 18 by adding the desulfurization agent 18 by top blowing. Can do.
- the desulfurization method of the hot metal 16 according to the second embodiment can improve the reaction interfacial area by using the desulfurization agent 18 having a smaller particle size as compared with the first embodiment, and obtain a high desulfurization ability. be able to.
- an oxidizing agent such as metallic aluminum, aluminum ash, or silicon may be added in addition to the desulfurizing agent 18 during the desulfurization treatment.
- the oxidizing agent is stored in a container different from the hopper 241 and the dispenser 251 provided in the mechanical stirring type desulfurization apparatuses 20a and 20b, and is added by cutting out a predetermined amount like the desulfurizing agent 18. Also good.
- the mechanical stirring type desulfurization apparatus according to the present invention may include two desulfurization agent addition units 24 and 25. At this time, the desulfurization agent 18 is added from the two desulfurization agent addition sections 24 and 25 so that the total addition amount becomes a predetermined addition amount.
- the desulfurization agent 18 in which quick lime and calcium aluminate are mixed is stored in the dispenser 251 and added to the hot metal 16, but the present invention is not limited to this.
- at least two dispensers 251 are provided, quick lime and calcium aluminate are separately stored in different dispensers 251, and a predetermined amount of quick lime and calcium aluminate are cut out and added to the hot metal 16 together with the conveying gas G. Also good.
- the quick lime and calcium aluminate to be added are such that the ratio of alumina contained in calcium aluminate with respect to the total addition amount is more than 0% and not more than 20%, and the mixing ratio of calcium aluminate with respect to the total addition amount is more than 0 mass% and more than 75 mass. % Is cut out. Furthermore, quicklime and calcium aluminate are cut out simultaneously, and are uniformly mixed by the conveying gas G when the powder supply pipe 253 and the upper blowing lance 254 are conveyed. Thus, by mixing the desulfurizing agent 18 immediately before injection, it is possible to more uniformly disperse the alumina of the desulfurizing agent 18 as compared with the desulfurizing agent addition unit 25 according to the second embodiment.
- the hot metal 16 in the hot metal ladle 14 used the mechanical stirring type desulfurization apparatus 20a, 20b which stirs and mixes using the impeller 21, this invention is not limited to this.
- a mechanical stirring type desulfurization device such as the impeller 21 for stirring the hot metal 16
- the gas injected from the top blowing lance, or the lance immersed in the hot metal 16 or the bottom of the hot metal pan 14 is provided.
- the desulfurizing agent 18 may be added as in the first embodiment, or may be injected together with the agitation gas from a lance for injecting the agitation gas.
- another container capable of accommodating the hot metal 16 such as a converter or a topped may be used.
- calcium aluminate is manufactured by mixing quick lime and alumina and then premelting, but the present invention is not limited to this.
- calcium aluminate a plurality of types of minerals (3CaO ⁇ Al 2 O 3 which main component consisting of CaO and Al 2 O 3, 12CaO ⁇ 7Al 2 O 3, CaO ⁇ Al 2 O 3, CaO ⁇ 2Al 2 O 3 Etc.), a plurality of raw materials may be selected and mixed from quick lime and alumina so that CaO / Al 2 O 3 has a predetermined mass ratio similar to that of the above embodiment, and further premelted. .
- Example 1 a desulfurization agent having a mass concentration ratio of Al 2 O 3 / (Al 2 O 3 + CaO) of 0.20 and a mixing ratio of calcium aluminate of 30 mass%, 75 mass%, and 50 mass% was used.
- the treatment was performed by the desulfurization method according to the first embodiment.
- Example 2 a desulfurization agent having a mass concentration ratio of Al 2 O 3 / (Al 2 O 3 + CaO) of 0.20 and a mixing ratio of calcium aluminate of 30 mass% is used, and the second embodiment is applied.
- the treatment was performed by the desulfurization method.
- Comparative Example 1 a mixture of quick lime and calcium aluminate having a mass concentration ratio of Al 2 O 3 / (Al 2 O 3 + CaO) of 0.50 as a desulfurizing agent and a calcium aluminate mixture ratio of 75 mass% is used. Used and treated in the same manner as in the first embodiment. Further, in Comparative Example 2, as a desulfurizing agent using fluorite, a mixture in which quick lime was mixed by 97 mass% and fluorite was mixed by 3 mass% was added and treated in the same manner as in the first embodiment. Furthermore, in Comparative Example 3, only lime was used as a desulfurizing agent, and the desulfurizing agent was added in the same manner as in the first embodiment for the treatment. The other conditions such as the rotation speed of the impeller 21 and the processing time are the same at all levels.
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Abstract
Description
また、例えば、特許文献2には、フッ素を含有しない脱硫剤として、化学成分が質量比でCaO:40~60%、Al2O3:60~40%であるカルシウムアルミネート、および上記カルシウムアルミネートと生石灰(CaO)とを混合させた脱硫剤が開示されている。
また、特許文献2に開示された鉄鋼添加剤は、製造コストの高いカルシウムアルミネートの脱硫剤中の混合比率が77%~100%と高いため、特許文献1と同様に、脱硫処理に掛かるコストの増大を招いていた。
また、本発明の一実施形態によれば、カルシウムアルミネートと生石灰とを、質量濃度比Al2O3/(Al2O3+CaO)が0超0.20以下、かつカルシウムアルミネートの混合率が0mass%超75mass%以下となるように混合させた混合物である脱硫剤が提供される。
[機械撹拌式脱硫装置の構成]
次に、図2を参照して、本発明の第1の実施形態に係る溶銑16の脱硫方法について説明する。第1の実施形態に係る溶銑16の脱硫方法は、機械撹拌式脱硫装置20aを用いた機械撹拌式脱硫方法である。まず、第1の実施形態に係る溶銑16の脱硫方法で用いられる機械撹拌式脱硫装置20aの構成について説明する。
インペラ21は、台車12に積載された溶銑鍋14に収容される溶銑16に浸漬・埋没し、回転することにより溶銑16を撹拌する撹拌羽根である。また、インペラ21は、インペラ軸211の他端側に設けられる不図示の昇降装置および回転装置により、鉛直方向に昇降可能に、且つインペラ軸211を回転軸として回転可能に構成される。
脱硫剤18は、脱硫剤18中のアルミナの比率を示す質量濃度比Al2O3/(Al2O3+CaO)が0超0.20以下、かつ脱硫剤18中のカルシウムアルミネートの混合率が0mass%超75mass%以下となるように、カルシウムアルミネートと生石灰とが均一に混合されることで製造される。ここで、上記の調査において、本願発明者らは、脱硫剤18のアルミナ比率を20%以下かつ、脱硫剤18中のカルシウムアルミネートの混合率を0mass%超30mass%以下とすることでスラグ中のS分配比を向上させることができることを明らかにした。さらに、後述の実施例で説明するように、本発明者らは、脱硫剤18のアルミナ比率を20%以下とすることにより、脱硫剤18中のカルシウムアルミネートの混合率が30mass%超75mass%以下の範囲についても、所定の脱硫能を得られることを確認した。
また、第1の実施形態の溶銑16には、どのような溶銑が用いられてもよい。すなわち、溶銑16には、高炉から出銑した状態の溶銑や、出銑した後に脱珪または脱燐の少なくとも一方の処理が予め行われた溶銑などが用いられる。
次に、第1の実施形態に係る溶銑16の脱硫方法について説明する。まず、インペラ21の位置が溶銑鍋14のほぼ中心となるように、溶銑鍋14を積載した台車12を移動する。次いで、インペラ21を下降させて溶銑16に浸漬させ、インペラ21を回転させる。さらに、ホッパ241に収容された脱硫剤18を切り出し装置242で必要量だけ切り出し、投入シュート243を介して溶銑16に上添加する。脱硫剤18の添加量は、脱硫剤18の脱硫能、溶銑16の成分・温度、目標とする処理後のS濃度、処理時間等の種々の条件から決定される。その後、所定時間の撹拌が行われたら、インペラ21の回転を停止し、インペラ21を上昇させ、脱硫処理が終了する。
なお、質量濃度比Al2O3/(Al2O3+CaO)が0の場合、アルミナによる液相率向上効果が得られなくなるため、高い脱硫能は得られない。
[機械撹拌式脱硫装置の構成]
次に、図3を参照して、本発明の第2の実施形態に係る溶銑16の脱硫方法について説明する。まず、第2の実施形態に係る溶銑16の脱硫方法で用いられる機械撹拌式脱硫装置20bの構成について説明する。
搬送用ガスGは、不活性ガス、非酸化性ガスおよび還元性ガスのいずれか一種類以上とすることができ、例えば窒素やアルゴン等であってもよい。
脱硫剤18は、第1の実施形態に係る脱硫剤18と同様である。
次に、第2の実施形態に係る溶銑16の脱硫方法について説明する。まず、インペラ21の位置が溶銑鍋14のほぼ中心となるように、溶銑鍋14を積載した台車12を移動する。次いで、インペラ21を下降させて溶銑16に浸漬させ、インペラ21を回転させる。さらに、ディスペンサ251に収容された脱硫剤18を切り出し装置252で必要量だけ切り出し、切り出した脱硫剤18を紛体供給管253および上吹きランス254を介して搬送用ガスGと共に溶銑16に噴射し、上吹き添加する。脱硫剤18の添加量は、脱硫剤18の脱硫能、溶銑16の成分・温度、目標とする処理後のS濃度、処理時間等の種々の条件から決定される。その後、所定時間の撹拌が行われたら、インペラ21の回転を停止し、インペラ21を上昇させ、脱硫処理が終了する。
以上で、特定の実施形態を参照して本発明を説明したが、これら説明によって発明を限定することを意図するものではない。本発明の説明を参照することにより、当業者には、開示された実施形態の種々の変形例とともに本発明の別の実施形態も明らかである。従って、特許請求の範囲は、本発明及び要旨に含まれるこれらの変形例または実施形態も網羅すると解すべきである。
また、例えば、本発明に係る機械撹拌式脱硫装置は、2つの脱硫剤添加部24,25を備えてもよい。このとき、脱硫剤18は、合計の添加量が所定の添加量となるように、2つの脱硫剤添加部24,25からそれぞれ添加される。
本実施例では、図1に示すように、第1および第2の実施形態に相当する2水準の実施例、および3水準の比較例について実験を行った。実験では、表1に示す各種条件で200tの溶銑16に対して脱硫処理を行い、処理前および処理後の溶銑中のS濃度について調査した。
14 溶銑鍋
16 溶銑
18 脱硫剤
20a,20b 機械撹拌式脱硫装置
21 インペラ
211 インペラ軸
24 脱硫剤添加部(上添加)
241 ホッパ
242 切り出し装置
243 投入シュート
25 脱硫剤添加部(上吹き添加)
251 ディスペンサ
252 切り出し装置
253 紛体供給管
254 上吹きランス
G 搬送用ガス
Claims (6)
- 溶銑を撹拌させて脱硫処理する際に、
前記溶銑に、カルシウムアルミネートと生石灰とを、質量濃度比Al2O3/(Al2O3+CaO)が0超0.20以下、かつ前記カルシウムアルミネートの混合率が0mass%超75mass%以下となるように混合させた脱硫剤を前記溶銑に添加することを特徴とする溶銑の脱硫方法。 - 前記溶銑を脱硫する際に、機械撹拌式脱硫装置を用いる請求項1に記載の溶銑の脱硫方法。
- 前記脱硫剤を前記溶銑に添加する際に、前記脱硫剤を上添加することを特徴とする請求項1または2に記載の溶銑の脱硫方法。
- 前記脱硫剤を前記溶銑に添加する際に、前記脱硫剤を上吹きランスを介して、前記脱硫剤の搬送用ガスと共に上吹き添加することを特徴とする請求項1または2に記載の溶銑の脱硫方法。
- 前記カルシウムアルミネートと前記生石灰とを前記上吹きランスへの搬送中に混合させることを特徴とする請求項4に記載の溶銑の脱硫方法。
- カルシウムアルミネートと生石灰とを、質量濃度比Al2O3/(Al2O3+CaO)が0超0.20以下、かつ前記カルシウムアルミネートの混合率が0mass%超75mass%以下となるように混合させた混合物であることを特徴とする脱硫剤。
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