JP3290050B2 - Hot metal desulfurization method - Google Patents
Hot metal desulfurization methodInfo
- Publication number
- JP3290050B2 JP3290050B2 JP14586895A JP14586895A JP3290050B2 JP 3290050 B2 JP3290050 B2 JP 3290050B2 JP 14586895 A JP14586895 A JP 14586895A JP 14586895 A JP14586895 A JP 14586895A JP 3290050 B2 JP3290050 B2 JP 3290050B2
- Authority
- JP
- Japan
- Prior art keywords
- gas
- hot metal
- desulfurization
- blowing
- reducing gas
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- 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
- Y02P10/10—Reduction of greenhouse gas [GHG] emissions
- Y02P10/143—Reduction of greenhouse gas [GHG] emissions of methane [CH4]
Description
【０００１】[0001]
【産業上の利用分野】この発明は、脱硫フラックスの利
用効率が高い、溶銑の脱硫方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for desulfurizing hot metal, which has a high use efficiency of a desulfurization flux.
【０００２】[0002]
【従来の技術】溶銑予備処理（脱硫処理）を行うに際し
て、還元性ガスを利用する方法は例えば特開昭57−2109
09号公報（溶銑予備処理方法）に開示されているよう
に、炭化水素ガスをキャリアガスとしてフラックスを吹
き込み、さらに酸素を上吹きする方法や、特開昭55−76
005 号公報（溶銑の脱硫方法）に開示されているよう
に、浴上添加により脱硫剤を供給したのちインペラーを
用いて攪拌しつつ、炭化水素ガスを吹き込んで雰囲気を
還元性にすることによって脱硫を促進する方法が知られ
ている。2. Description of the Related Art A method of using a reducing gas in performing a hot metal pretreatment (desulfurization treatment) is disclosed in, for example, Japanese Patent Laid-Open No. 57-2109.
As disclosed in Japanese Patent Publication No. 09 (hot metal pretreatment method), a method in which a flux is blown using a hydrocarbon gas as a carrier gas and oxygen is blown upward, and a method disclosed in Japanese Patent Application Laid-Open No. 55-76.
As disclosed in Japanese Unexamined Patent Publication No. 005 (method for desulfurizing hot metal), desulfurization is performed by supplying a desulfurizing agent by adding it on a bath and then stirring it with an impeller while blowing hydrocarbon gas to reduce the atmosphere. There are known ways to promote.
【０００３】しかしながら、特開昭57−210909号公報に
示された方法では、炭化水素ガスを搬送ガスとして用い
るために炭化水素ガスが溶銑中に溶解してしまい浴全体
の酸素ポテンシャルは低下するが主な反応界面での酸素
ポテンシャル低下の効果が低いという問題、すなわち、
インジェクションでガスを供給するため主たる反応界面
であるトップスラグ／メタル界面の酸素ポテンシャルを
低下させようとすれば浴全体の酸素ポテンシャルを低下
させなければならず、トップスラグ／メタル界面の酸素
ポテンシャルのみを低下させる場合に比べてより多量の
還元性ガスが必要となり効率が悪くなるという問題があ
る。また、フラックスをキャリアガスで搬送する場合搬
送可能な最低ガス流量が存在し、それ以下にはガス流量
を減らせないという欠点があり、さらに炭化水素以外の
ガスとの混合によって炭化水素ガス流量を減らすことと
同様の効果を得ようとすれば、異種ガスの混合にともな
う複雑な設備が必要となり設備費が増大するという欠点
がある。However, in the method disclosed in Japanese Patent Application Laid-Open No. 57-210909, since the hydrocarbon gas is used as a carrier gas, the hydrocarbon gas dissolves in the hot metal, and the oxygen potential of the entire bath decreases. The problem that the effect of lowering the oxygen potential at the main reaction interface is low, that is,
In order to reduce the oxygen potential at the top slag / metal interface, which is the main reaction interface for supplying gas by injection, the oxygen potential of the entire bath must be reduced, and only the oxygen potential at the top slag / metal interface is reduced. There is a problem that a larger amount of reducing gas is required as compared with the case of lowering, and the efficiency is lowered. In addition, when the flux is transported by a carrier gas, there is a minimum gas flow rate that can be transported, and there is a drawback that the gas flow rate cannot be reduced below the minimum flow rate. In order to obtain the same effect as described above, there is a drawback that complicated equipment for mixing different gases is required and equipment cost is increased.
【０００４】一方、特開昭55−76005 号公報に示された
方法も同様にインジェクションにて炭化水素ガスを供給
するため、反応界面の酸素ポテンシャルを低下させよう
とすれば浴全体の酸素ポテンシャルを低下させなければ
ならない点で効率が悪くなるという問題がある。On the other hand, in the method disclosed in JP-A-55-76005, a hydrocarbon gas is similarly supplied by injection. Therefore, if the oxygen potential at the reaction interface is lowered, the oxygen potential of the entire bath is reduced. There is a problem in that the efficiency must be lowered in that it must be reduced.
【０００５】[0005]
【発明が解決しようとする課題】この発明は前記した問
題点を有利に解決し、還元性ガスの利用効率が高く優れ
る脱硫効率を有する溶銑の脱硫方法を提案することを目
的とする。SUMMARY OF THE INVENTION It is an object of the present invention to advantageously solve the above-mentioned problems and to propose a method for desulfurizing hot metal which has a high utilization efficiency of reducing gas and a high desulfurization efficiency.
【０００６】[0006]
【課題を解決するための手段】この発明は前記問題点を
解決するために、溶銑予備処理用脱硫フラックスを溶銑
浴面下に吹き込みつつ、還元性ガスを上吹きし、その上
吹きの吹き付け位置と脱硫フラックスの浮上位置とを実
質的に一致させるようにし、還元性ガスの利用効率の向
上ひいては脱硫効率の向上をはかるものである。すなわ
ち、この発明の要旨とするところは以下のとおりであ
る。SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention blows a reducing gas upward while blowing a desulfurizing flux for hot metal pretreatment below the surface of a hot metal bath. And the floating position of the desulfurization flux are made to substantially coincide with each other, so as to improve the use efficiency of the reducing gas, and to improve the desulfurization efficiency. That is, the gist of the present invention is as follows.
【０００７】溶銑浴中に浸漬したランスを介してキャ
リアガスと共に粉状の脱硫剤を浴中に吹き込むことによ
って溶銑中の硫黄分を除去するにあたって、溶銑浴面に
その上方から還元性ガスを吹き付けること、および該還
元性ガスを吹き付けるランス位置と脱硫剤の吹き込むノ
ズル位置との水平方向距離ｄ(m) が下記式(1) を満たす
こととからなる溶銑の脱硫方法（第１発明）。 〔記〕 ｄ≦0.25Ｈ＋0.65Ｄ …(1) ただし、Ｈ：溶銑浴表面からの還元性ガス吹き付けラン
ス位置高さ(m) Ｄ：溶銑浴表面からの脱硫剤の吹き込みノズル位置深さ
(m)[0007] In removing sulfur content in hot metal by blowing a powdery desulfurizing agent into the bath together with a carrier gas through a lance immersed in the hot metal bath, a reducing gas is blown from above onto the hot metal bath surface. And a horizontal distance d (m) between the position of the lance for blowing the reducing gas and the position of the nozzle for blowing the desulfurizing agent satisfies the following formula (1) (1st invention). [Note] d ≦ 0.25H + 0.65D (1) where H: height of the lance for blowing the reducing gas from the hot metal bath surface (m) D: depth of the nozzle for blowing the desulfurizing agent from the hot metal bath surface
(m)
【０００８】上吹きする還元性ガスがコークス炉ガス
である第１発明の溶銑の脱硫方法（第２発明）。The method for desulfurizing hot metal according to the first invention, wherein the reducing gas blown upward is a coke oven gas (second invention).
【０００９】上吹きする還元性ガス組成がH2：65％以
下、CH4 ：43％以下およびCO：16％以下を満たしてなる
第１または第２発明の溶銑の脱硫方法（第３発明）。[0009] the top-blown to the reducing gas composition H 2: 65% or less, CH 4: 43% or less and CO: first or molten pig iron method desulfurization of the second invention comprising 16% satisfy the following (third invention) .
【００１０】[0010]
【作用】この発明の作用を実験例を基にして以下に述べ
る。この発明は、脱硫用フラックスを溶銑浴面下に吹き
込んで脱硫するに際して、そのフラックスの浮上位置に
還元性ガスを吹き付けることによって主な反応界面であ
るトップスラグ／メタル界面の酸素ポテンシャルを、還
元性ガスを添加しない場合および、搬送ガスとして使用
する場合に比較して、低く保つことを可能とし、その結
果として脱硫速度を向上させるものである。The operation of the present invention will be described below based on experimental examples. According to the present invention, when a desulfurizing flux is blown under the surface of a hot metal bath for desulfurization, a reducing gas is blown to a floating position of the flux to reduce an oxygen potential at a top slag / metal interface, which is a main reaction interface, to a reducing property. Compared to the case where no gas is added and the case where the gas is used as a carrier gas, it can be kept low, and as a result, the desulfurization rate is improved.
【００１１】発明者らは、小型溶解炉を用いて、還元性
ガスを上吹きした場合（Ａ法）、およびインジェクショ
ンにより供給した場合（Ｂ法）についての溶銑の脱硫実
験を行った。それらの結果を図１に示す。図１は還元性
ガス供給法の違いによる脱硫時間と溶銑〔％ｓ〕との関
係を示すグラフである。The inventors conducted desulfurization experiments of hot metal in a case where the reducing gas was blown upward (method A) and in a case where the reducing gas was supplied by injection (method B) using a small melting furnace. The results are shown in FIG. FIG. 1 is a graph showing the relationship between the desulfurization time and the hot metal [% s] depending on the difference in the reducing gas supply method.
【００１２】ここで、上記実験の主要条件を以下に示
す。 ・溶銑量 14kg。 ・還元性ガス 表１に示す組成のコークス炉ガス（以下Ｃガスという）
を使用。Here, the main conditions of the above experiment are shown below.・ Hot metal amount 14kg.・ Reducing gas Coke oven gas having the composition shown in Table 1 (hereinafter referred to as C gas)
use.
【００１３】[0013]
【表１】 ・脱硫用フラックスとその供給 CaO −20％CaF2を10g/min の供給速度で14分間供給。 ・Ａ法の場合のガスの吹き込み 脱硫用フラックス用搬送ガスとして、N2ガスを流量３Nl
/minで吹き込み、これとは別にＣガスを流量３Nl/minで
14分間上吹きする。 ・Ｂ法の場合のガスの吹き込み 脱硫用フラックスの搬送ガスとして、Ｃガス：N2ガスが
１：１の混合ガスを流量６Nl/minで吹き込む。[Table 1] And desulfurization flux and its supply CaO -20% CaF 2 at a feed rate of 10 g / min 14 min.・ Injection of gas in the case of A method N 2 gas as a carrier gas for desulfurization flux 3Nl flow rate
/ min, and C gas separately at a flow rate of 3Nl / min
Blow up for 14 minutes. Blowing of gas in the case of method B As a carrier gas for the desulfurization flux, a 1: 1 mixed gas of C gas and N 2 gas is blown at a flow rate of 6 Nl / min.
【００１４】図１から明らかなように、Ａ法はＢ法に比
べて大きな脱硫速度を示していて、還元性ガスの上吹き
が溶銑の脱硫に極めて有効であることが分る。なお還元
性ガスとしてH2, CH4 および C3H8 などを用いた場合で
も同様の傾向が得られることを確認した。As is apparent from FIG. 1, the method A shows a higher desulfurization rate than the method B, and it can be seen that the upper blowing of the reducing gas is extremely effective for the desulfurization of the hot metal. It was also confirmed that the same tendency was obtained when H 2 , CH 4, C 3 H 8 or the like was used as the reducing gas.
【００１５】次に上吹き還元性ガスとして、表１に示し
た組成のＣガスにH2, CH4, CO, Arを混合した場合のＡ
法による脱硫挙動の変化を図２〜５に示す。ここで、図
２は上吹き還元性ガスとしてＣガスにH2ガスを混合した
場合、図３はＣガスにCH4 ガスを混合した場合、図４は
ＣガスにCOガスを混合した場合、図５はＣガスにＡｒガ
スを混合した場合について、それぞれの混合ガスの混合
比と脱硫速度との関係を示すグラフである。Next, as the top blowing reducing gas, A in the case of mixing H 2 , CH 4 , CO, Ar with C gas having the composition shown in Table 1
Changes in desulfurization behavior by the method are shown in FIGS. Here, FIG. 2 shows a case where H 2 gas is mixed with C gas as a top blowing reducing gas, FIG. 3 shows a case where CH 4 gas is mixed with C gas, and FIG. 4 shows a case where CO gas is mixed with C gas. FIG. 5 is a graph showing the relationship between the mixing ratio of each mixed gas and the desulfurization rate when Ar gas is mixed with C gas.
【００１６】ただしｋs は下記式(2) より求めた見掛け
の脱硫速度定数である。 ｌn 〔％Ｓ〕ｉ−ｌn 〔％Ｓ〕ｆ＝ｋs ｔ …(2) 〔％Ｓ〕ｉ：処理前Ｓ濃度（wt％) 〔％Ｓ〕ｆ：処理後Ｓ濃度（wt％) ｔ：処理時間（mm） なお、上記実験は上吹きガスの合計流量を３Nl/minと
し、N2ガスを搬送ガスとして流量３Nl/minで脱硫フラッ
クスを10g/min の速度で溶銑量14kg中に14分間吹き込む
ことによって行った。Here, k s is an apparent desulfurization rate constant obtained from the following equation (2). l n [% S] i-l n [% S] f = ks t ... (2) [% S] i: Pretreatment S concentration (wt%) [% S] f: after processing S concentration (wt%) t: Treatment time (mm) In the above experiment, the total flow rate of the top blown gas was 3 Nl / min, and the desulfurization flux was 10 g / min at a flow rate of 3 Nl / min using N 2 gas as a carrier gas in a hot metal mass of 14 kg. Performed by blowing for 14 minutes.
【００１７】図２〜４から明らかなように、Ｃガスに
H2, CH4, CO を混合し、その含有量が特定値を超えると
脱硫速度は低下する。すなわち、図２においてはH2ガス
が65％超え、図３においてはCH4 ガスが43％超えおよび
図４においてはCOガスが16％超えにてそれぞれ脱硫速度
が低下している。したがって、上吹きガスとして使用す
るＣガス組成としては、脱硫効率の観点からH2：65％以
下、CH4 ：43％以下およびCO：16％以下とすることがよ
い。As is apparent from FIGS.
When H 2 , CH 4 and CO are mixed and the content exceeds a specific value, the desulfurization rate decreases. That is, in FIG. 2, the desulfurization rate decreases when the H 2 gas exceeds 65%, in FIG. 3, the CH 4 gas exceeds 43%, and in FIG. 4, the CO gas exceeds 16%. Therefore, the C gas composition for use as a top-blown gas, H in terms of the desulfurization efficiency two sixty-five% or less, CH 4: 43% or less and CO: Good be 16% or less.
【００１８】また、図５は上吹き還元性ガスとして、Ｃ
ガスにArガスを混合した場合の混合比と脱硫速度との関
係を示すグラフである。この図５から明らかなように、
上吹きガス組成がH2：28％未満、CH4 ：14％未満および
CO：3.4 ％未満で脱硫速度が低下している。したがっ
て、上吹きガスの組成としては、H2：28％以上、CH4 ：
14％以上およびCO：3.4 ％以上とすることが好ましい。FIG. 5 shows C as the top blowing reducing gas.
4 is a graph showing the relationship between the mixing ratio and the desulfurization rate when Ar gas is mixed with the gas. As is apparent from FIG.
The top-blown gas composition H 2: less than 28%, CH 4: less than 14% and
CO: Less than 3.4%, the desulfurization rate decreases. Therefore, the composition of the top-blown gas, H 2: 28% or more, CH 4:
It is preferable that the content be 14% or more and CO: 3.4% or more.
【００１９】なお、Ｃガス組成において上記のような最
適範囲が存在する理由は不明であるが、H2, CH4 および
COガス間に何らかの反応が生じるためと考えられる。The reason why the above-mentioned optimum range exists in the C gas composition is unknown, but H 2 , CH 4 and
It is considered that some reaction occurs between the CO gases.
【００２０】ついで、上吹きにＣガスを用い上吹きの吹
き付けランス位置とフラックスの吹き込みノズル位置と
の水平距離を変更した以外は、上記と同様の条件で溶銑
の脱硫実験を行った。これらの実験結果を図６に示す。
図６は上吹きの吹き付けランス位置とフラックスの吹き
込みノズル位置間の水平距離と脱流速度との関係を示す
グラフである。ただしランス高さＨは0.03m および0.05
m とし、また吹き込みノズル深さＤは0.05m とした。Next, a desulfurization experiment of molten iron was performed under the same conditions as above except that the horizontal distance between the blowing lance position of the upper blowing and the position of the flux blowing nozzle was changed by using C gas for the upper blowing. FIG. 6 shows the results of these experiments.
FIG. 6 is a graph showing the relationship between the horizontal distance between the blowing lance position of the top blowing and the position of the flux blowing nozzle and the outflow speed. However, the lance height H is 0.03m and 0.05
m, and the blowing nozzle depth D was 0.05 m.
【００２１】図６から明らかなように水平距離を前記式
(1) で求まるｄの値以下（Ｈ：0.03m の場合ｄ：0.04m
以下、Ｈ：0.05m の場合ｄ：0.045m以下) にすることに
よって脱硫速度は早くなることが分る。これは浮上直後
のフラックスが還元雰囲気にさらされることが脱硫の促
進に有効なためと考えられるが、詳細なメカニズムは不
明である。As is clear from FIG. 6, the horizontal distance is calculated by the above equation.
(1) or less (d: 0.04m for H: 0.03m)
Hereafter, it can be seen that the desulfurization rate is increased by setting H: 0.05 m and d: 0.045 m or less. This is thought to be due to the fact that exposure of the flux immediately after the ascent to the reducing atmosphere is effective in promoting desulfurization, but the detailed mechanism is unknown.
【００２２】[0022]
【実施例】この発明に適合する適合例３例と比較例２例
とについて以下に順に述べる。 適合例１ ５ｔ転炉を用いて溶銑５ｔの脱硫処理を行った。脱硫処
理はCaO −20％CaF2系フラックスを脱硫剤として浴面下
より吹き込みH2を上吹きすることによって行い、脱硫処
理後の溶銑成分組成を調査した。フラックスの吹き込み
速度は10kg/min、フラックスの搬送ガスは流量 1.0Nm3/
min のN2ガスとし、吹き込みノズル深さ0.4mとした。ま
た、H2の上吹きの流量、ランス高さはそれぞれ1.0Nm3/m
in、1.0mとし、上吹きの吹付けランス位置と底吹きの吹
込みノズル位置との間の水平距離は0.6m とした。DESCRIPTION OF THE PREFERRED EMBODIMENTS Three conforming examples and two comparative examples conforming to the present invention will be described below in order. Adaptation Example 1 5t of hot metal was desulfurized using a 5t converter. Desulfurization treatment was carried out by blowing on of H 2 blown from the bath surface under the CaO -20% CaF 2 based flux as desulfurizing agent, were investigated hot metal component composition after the desulfurization treatment. The flux blowing speed is 10 kg / min, and the flux carrier gas is 1.0 Nm 3 /
min N 2 gas, and the blowing nozzle depth was 0.4 m. The flow rate of top-blown of H 2, the lance height is respectively 1.0 Nm 3 / m
in, 1.0 m, and the horizontal distance between the position of the top blowing lance and the position of the bottom blowing nozzle was 0.6 m.
【００２３】かくして、脱硫処理は５分間行った。脱硫
処理前後の溶銑の成分組成を表２に示す。Thus, the desulfurization treatment was performed for 5 minutes. Table 2 shows the composition of the hot metal before and after the desulfurization treatment.
【００２４】[0024]
【表２】 [Table 2]
【００２５】適合例２ H2上吹きに変えて表１に示した組成のＣガスの上吹きを
行った以外は、適合例１と同様の条件で脱硫処理を行っ
た。脱硫処理前後の溶銑の成分組成を表３に示す。Adaptation Example 2 A desulfurization treatment was carried out under the same conditions as in Adaptation Example 1, except that the C gas having the composition shown in Table 1 was used instead of H 2 top blow. Table 3 shows the composition of the hot metal before and after the desulfurization treatment.
【００２６】[0026]
【表３】 [Table 3]
【００２７】実施例３ 上吹きの吹き付けランス位置と底吹きの吹き込みノズル
位置の間の水平距離を０m とした以外は、適合例２と同
様の条件で脱硫処理を行った。脱硫処理前後の溶銑の成
分組成を表４に示す。Example 3 A desulfurization treatment was carried out under the same conditions as in Example 2 except that the horizontal distance between the position of the top blowing lance and the position of the bottom blowing nozzle was 0 m. Table 4 shows the composition of the hot metal before and after the desulfurization treatment.
【００２８】[0028]
【表４】 [Table 4]
【００２９】比較例１ Ｃガスを上吹きするかわりに搬送ガスに混合してインジ
ェクションを行った以外は適合例２と同様の条件で脱硫
処理を行った。脱硫処理前後の溶銑の成分組成を表５に
示す。Comparative Example 1 A desulfurization treatment was carried out under the same conditions as in Applicable Example 2 except that the C gas was mixed with the carrier gas and injected instead of blowing upward. Table 5 shows the composition of the hot metal before and after the desulfurization treatment.
【００３０】[0030]
【表５】 [Table 5]
【００３１】比較例２ 上吹きの吹き付けランス位置と底吹きの吹き込みノズル
位置との間の水平距離を1.5mとした以外は適合例１と同
様の条件で脱硫処理を行った。脱硫処理前後の溶銑の成
分組成を表６に示す。Comparative Example 2 Desulfurization treatment was carried out under the same conditions as in Applicable Example 1 except that the horizontal distance between the position of the top blowing lance and the position of the bottom blowing nozzle was 1.5 m. Table 6 shows the composition of the hot metal before and after the desulfurization treatment.
【００３２】[0032]
【表６】 [Table 6]
【００３３】以上、 これらの適合例および比較例の溶
銑の脱硫率および脱流量を表７にまとめて示す。The desulfurization rates and desulfurization rates of the hot metal of these conforming examples and comparative examples are summarized in Table 7.
【００３４】[0034]
【表７】 [Table 7]
【００３５】表７から明らかなように、この発明の適合
例は比較例に比して、脱硫率、脱硫量ともに大きく、こ
の発明は溶銑の脱硫速度の向上に極めて有効であること
が分る。As is clear from Table 7, the applicable examples of the present invention are larger in both the desulfurization rate and the desulfurization amount than the comparative examples, indicating that the present invention is extremely effective in improving the desulfurization rate of hot metal. .
【００３６】[0036]
【発明の効果】この発明は、溶銑浴面下に脱硫フラック
スを吹き込んで溶銑の脱硫を行うにあたり、還元性ガス
を上吹きし、かつその上吹き位置を特定するものであっ
て、この発明によれば、還元性ガスが有効に溶銑の脱硫
に寄与し、脱硫効率を向上できるとともに、従来のイン
ジェクション法に比しより簡単な設備で脱硫を行うこと
ができるという効果も有する。According to the present invention, when desulfurization of hot metal is performed by blowing a desulfurization flux below the hot metal bath surface, reducing gas is blown upward and the position of the upper blow is specified. According to this, the reducing gas effectively contributes to the desulfurization of the hot metal, so that the desulfurization efficiency can be improved, and there is also an effect that desulfurization can be performed with simpler equipment than in the conventional injection method.
【図１】還元性ガス供給法の違いによる脱硫時間と溶銑
〔％Ｓ〕と関係を示すグラフである。FIG. 1 is a graph showing the relationship between desulfurization time and hot metal [% S] depending on the method of supplying reducing gas.
【図２】上吹き還元性ガスとして、ＣガスにH2ガスを混
合した場合の混合ガスの混合比と脱硫速度との関係を示
すグラフである。FIG. 2 is a graph showing a relationship between a mixing ratio of a mixed gas and a desulfurization rate when H 2 gas is mixed with C gas as a top blowing reducing gas.
【図３】上吹き還元性ガスとして、ＣガスにCH4 ガスを
混合した場合の混合ガスの混合比と脱硫速度との関係を
示すグラフである。FIG. 3 is a graph showing a relationship between a mixing ratio of a mixed gas and a desulfurization rate when C 4 gas is mixed with C gas as a top blowing reducing gas.
【図４】上吹き還元性ガスとして、ＣガスにCOガスを混
合した場合の混合ガスの混合比と脱硫速度との関係を示
すグラフである。FIG. 4 is a graph showing a relationship between a mixing ratio of a mixed gas and a desulfurization rate when CO gas is mixed with C gas as a top blowing reducing gas.
【図５】上吹き還元性ガスとして、ＣガスにArガスを混
合した場合の混合ガスの混合比と脱硫速度との関係を示
すグラフである。FIG. 5 is a graph showing a relationship between a mixing ratio of a mixed gas and a desulfurization rate when C gas is mixed with Ar gas as a top blowing reducing gas.
【図６】上吹き吹き付けランス位置とフラックス吹き込
みノズル位置間の水平距離と脱硫速度との関係を示すグ
ラフである。FIG. 6 is a graph showing a relationship between a horizontal distance between a top blowing lance position and a flux blowing nozzle position and a desulfurization speed.
フロントページの続き (56)参考文献 特開 昭54−159321（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) C21C 1/02 Continuation of front page (56) References JP-A-54-159321 (JP, A) (58) Field surveyed (Int. Cl. 7 , DB name) C21C 1/20
Claims (3)
リアガスと共に粉状の脱硫剤を浴中に吹き込むことによ
って溶銑中の硫黄分を除去するにあたって、溶銑浴面に
その上方から還元性ガスを吹き付けること、および該還
元性ガスを吹き付けるランス位置と脱硫剤の吹き込むノ
ズル位置との水平方向距離ｄ(m) が下記式(1) を満たす
こととからなる溶銑の脱硫方法。 〔記〕 ｄ≦0.25Ｈ＋0.65Ｄ …(1) ただし、Ｈ：溶銑浴表面からの還元性ガス吹き付けラン
ス位置高さ(m) Ｄ：溶銑浴表面からの脱硫剤の吹き込みノズル位置深さ
(m)When a sulfur content in hot metal is removed by blowing a powdery desulfurizing agent into a bath together with a carrier gas through a lance immersed in the hot metal bath, a reducing gas is introduced from above the hot metal bath surface. And a horizontal distance d (m) between a lance position for blowing the reducing gas and a nozzle position for blowing the desulfurizing agent satisfies the following formula (1). [Note] d ≦ 0.25H + 0.65D (1) where H: height of the lance for blowing the reducing gas from the hot metal bath surface (m) D: depth of the nozzle for blowing the desulfurizing agent from the hot metal bath surface
(m)
である請求項１に記載の溶銑の脱硫方法。2. The method for desulfurizing hot metal according to claim 1, wherein the reducing gas blown upward is a coke oven gas.
下、CH4 ：43％以下およびCO：16％以下を満たしてなる
請求項１または２に記載の溶銑の脱硫方法。3. The method for desulfurizing hot metal according to claim 1, wherein the composition of the reducing gas blown upward satisfies H 2 : 65% or less, CH 4 : 43% or less, and CO: 16% or less.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14586895A JP3290050B2 (en) | 1995-06-13 | 1995-06-13 | Hot metal desulfurization method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14586895A JP3290050B2 (en) | 1995-06-13 | 1995-06-13 | Hot metal desulfurization method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08337807A JPH08337807A (en) | 1996-12-24 |
| JP3290050B2 true JP3290050B2 (en) | 2002-06-10 |
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ID=15394920
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14586895A Expired - Fee Related JP3290050B2 (en) | 1995-06-13 | 1995-06-13 | Hot metal desulfurization method |
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| Country | Link |
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|---|---|---|---|---|
| JP3608439B2 (en) * | 1999-07-05 | 2005-01-12 | Ｊｆｅスチール株式会社 | Desulfurization method of molten iron alloy |
| JP5617195B2 (en) * | 2009-06-29 | 2014-11-05 | Ｊｆｅスチール株式会社 | Hot metal desulfurization method |
| CN111876654B (en) * | 2020-07-01 | 2021-12-07 | 石横特钢集团有限公司 | Production method of low-temperature impact resistant blank for D-level power angle steel |
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Also Published As
| Publication number | Publication date |
|---|---|
| JPH08337807A (en) | 1996-12-24 |
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