JPH08176632A - Desulfurizing agent of molten iron and desulfurization - Google Patents
Desulfurizing agent of molten iron and desulfurizationInfo
- Publication number
- JPH08176632A JPH08176632A JP32614494A JP32614494A JPH08176632A JP H08176632 A JPH08176632 A JP H08176632A JP 32614494 A JP32614494 A JP 32614494A JP 32614494 A JP32614494 A JP 32614494A JP H08176632 A JPH08176632 A JP H08176632A
- Authority
- JP
- Japan
- Prior art keywords
- desulfurization
- slag
- desulfurizing
- desulfurizing agent
- hot metal
- 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.)
- Granted
Links
Landscapes
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、溶銑の脱硫剤及び脱硫
方法に関する。TECHNICAL FIELD The present invention relates to a desulfurizing agent for hot metal and a desulfurizing method.
【０００２】[0002]
【従来技術】溶銑の脱硫剤としては、例えば日本金属学
会会報第２２巻第５号（１９８３年）に報告されている
ように、ＣａＯを主成分とし、これにＣａＣＯ3 等の反
応促進剤を１０〜３５重量％及びＣａＦ2 等の滓化促進
剤を３〜５重量％混合したものが一般に用いられてい
る。脱硫剤中の反応促進剤が少ないと脱硫効率が低下
し、多過ぎるとスロッピングが激しくなる。また滓化促
進剤が少ないと、滓化不十分のため脱硫効率が低下し、
多いと耐火物の溶損が激しくなる。2. Description of the Related Art As a desulfurizing agent for hot metal, for example, as reported in The Bulletin of the Japan Institute of Metals, Vol. 22, No. 5 (1983), CaO is a main component, and a reaction accelerator such as CaCO 3 is added thereto. A mixture of 10 to 35% by weight and 3 to 5% by weight of a slagging accelerator such as CaF 2 is generally used. If the amount of the reaction accelerator in the desulfurization agent is small, the desulfurization efficiency will be reduced, and if it is too large, sloping will be severe. If the amount of the slagging accelerator is small, the desulfurization efficiency will decrease due to insufficient slagging,
If too much, melting of refractory becomes severe.
【０００３】こうした脱硫剤を用いて、脱珪及び脱燐を
施しておらず、しかも高炉スラグが存在した状態の溶銑
を脱硫した場合、形成されるスラグは塊状かつ固体状を
なすため、スラグドラッカー等の設備を用いることな
く、トピードカー或いは脱硫鍋等の反応容器の傾動によ
る自然排滓が可能となり、工場の自動化及び無人化を推
進することができる。[0003] When desulfurizing hot metal which has not been subjected to desiliconization and dephosphorization and in which blast furnace slag is present using such a desulfurizing agent, the slag formed is in the form of lumps and solids. Without using such equipment, natural sludge can be obtained by tilting the reaction vessel such as a speede car or a desulfurization pot, and automation and unmanned operation of the factory can be promoted.
【０００４】一方、最近脱硫時間の短縮、或いは脱硫時
のスロッピング軽減等を目的として、優れた脱硫能を有
する金属Ｍｇが注目されている。特に、粉体状に加工し
た後、その表面をスラグ質でコーティングする技術の向
上や、消防法の改正により保管時の条件が緩和されたこ
とも合わせて、ＣａＯと共に吹込むことにより脱硫剤と
して工業的に用いられるようになってきている。こうし
た技術が例えば、特開平５−１４０６２６号公報に開示
されている。この場合、Ｍｇの配合は２０〜９５重量％
となっているが、これは、脱硫前の脱燐後に除滓を行う
場合であり、高炉スラグが存在する場合には、ある程度
ＣａＯにより、脱硫前のスラグの塩基度を高くして脱硫
効率を高める必要がある。On the other hand, recently, for the purpose of shortening the desulfurization time or reducing the sloping at the time of desulfurization, metallic Mg having an excellent desulfurization ability has attracted attention. In particular, by improving the technology of coating the surface with slag after processing it into powder and relaxing the conditions for storage due to the revision of the Fire Defense Law, it can be used as a desulfurizing agent by blowing with CaO. It has come to be used industrially. Such a technique is disclosed in, for example, Japanese Unexamined Patent Publication No. 5-140626. In this case, the Mg content is 20 to 95% by weight.
However, this is a case where slag is removed after dephosphorization before desulfurization, and when blast furnace slag is present, CaO is used to some extent to increase the basicity of the slag before desulfurization to improve the desulfurization efficiency. Need to raise.
【０００５】[0005]
【発明が解決しようとする課題】上述するようなＭｇを
配合した脱硫剤を用いた場合、溶銑中に溶存或いは一度
気化したＭｇが酸化して生成したＭｇＯのために、局部
的に融点が上昇し、塊状スラグと共に粉体状スラグが形
成される割合が増加してくる。粉体状のスラグは、反応
容器の傾動による排滓を実施した場合、十分に除去する
ことができず、溶銑と共に転炉に持ち込まれて、酸素吹
き吹錬中に、 （ＣａＳ）＋Ｏ2 →ＣａＯ＋［Ｓ］ の反応により、溶銑中に硫黄が戻り復硫する原因とな
る。When the desulfurizing agent containing Mg as described above is used, the melting point locally rises due to MgO dissolved or once vaporized Mg is oxidized to form MgO. However, the ratio of the powdery slag formed together with the lumped slag increases. The powdery slag cannot be sufficiently removed when the slag is removed by tilting the reaction vessel, and it is brought into the converter together with the hot metal and (CaS) + O 2 → The reaction of CaO + [S] causes sulfur to return to the hot metal to cause re-vulcanization.
【０００６】こうした転炉での復硫を防止するために、
必要以上に排滓処理を施した場合、粉体状のスラグは除
去されるが、同時に余分の溶銑が脱硫スラグ中へ流出さ
れることになり、鉄分のロスが増加するという問題が生
ずる。これらの問題点を解決するために、スラグドラッ
カーを用いて排滓することも考えられるが、この場合、
ドラッカー設備及び運転要員が必要となり、このような
スラグ除去作業は、工場の自動化及び無人化を妨げる要
因となる。In order to prevent re-sulfurization in such a converter,
When the waste slag treatment is performed more than necessary, the powdery slag is removed, but at the same time, excess hot metal flows out into the desulfurization slag, which causes a problem of increasing iron loss. In order to solve these problems, it is possible to use a slag drucker to dispose of slag, but in this case,
Drucker equipment and operating personnel are required, and such slag removal work becomes a factor that hinders automation and unmanned operation of the factory.
【０００７】本発明は、ＣａＯ−Ｍｇ脱硫剤を用いたと
きの、転炉での復硫或いは鉄分ロスの増加の問題を発生
させることなく、トピードカーや脱硫鍋の傾動による自
然排滓を可能にする溶銑脱硫剤、及び該脱硫剤を用いた
溶銑脱硫方法を提供することを目的としている。The present invention enables natural slag by tilting a speeded car or a desulfurization pot without causing the problem of re-sulfurization in a converter or increase of iron loss when a CaO-Mg desulfurizing agent is used. It is an object of the present invention to provide a hot metal desulfurizing agent and a method for hot metal desulfurizing using the desulfurizing agent.
【０００８】[0008]
【課題の解決手段】本発明は、上記の課題を解決するた
めに、金属Ｍｇ５〜３０重量％、ＣａＯ９５〜６０重量
％の範囲の組成物を重量割合で９０％以上含有したもの
に、更にＣａＦ2 を３〜１０重量％を配合した溶銑脱硫
剤、及びこの溶銑脱硫前を脱珪、脱燐を施しておらず、
高炉スラグが存在する溶銑に吹込むことにより脱硫する
溶銑の脱硫方法を提供しようとするものである。In order to solve the above-mentioned problems, the present invention comprises a composition containing 5 to 30% by weight of metal Mg and 95 to 60% by weight of CaO in an amount of 90% by weight or more, and further comprising CaF. Hot metal desulfurization agent containing 2 to 3 to 10% by weight, and before this hot metal desulfurization is not desiliconized or dephosphorized,
An object of the present invention is to provide a method for desulfurizing hot metal that is desulfurized by blowing it into hot metal containing blast furnace slag.
【０００９】ＣａＯ−Ｍｇの組成物にＣａＦ2 を適量混
合することで、局部的に脱硫スラグの融点が低下し、溶
融後に凝固或いは焼結させることができるようになる。
このため形成されるスラグは塊状となり、粉体状のスラ
グの割合は激減した。本発明において、Ｍｇの配合割合
を５〜３０重量％としたのは、５重量％未満では、脱硫
効率が悪くなり、３０重量％を越えると、ＣａＯの割合
が減少し、脱硫スラグの塩基度が小さくなるため、脱硫
効率が低下するためである。また、ＣａＦ2 の含有量を
３〜１０重量％としたのは、３重量％未満では、粉体状
スラグの割合が増加し、１０重量％を越えると、脱硫剤
中のＭｇ含有量の減少により脱硫能の低下、或いはＣａ
Ｆ2 の影響により耐火物の損耗が激しくなるためであ
る。By mixing an appropriate amount of CaF 2 into the CaO-Mg composition, the melting point of desulfurization slag is locally lowered, and it becomes possible to solidify or sinter it after melting.
As a result, the slag formed became lumpy and the proportion of powdery slag drastically decreased. In the present invention, the mixing ratio of Mg is set to 5 to 30% by weight because when the amount is less than 5% by weight, the desulfurization efficiency becomes poor, and when it exceeds 30% by weight, the ratio of CaO decreases and the basicity of the desulfurization slag is reduced. This is because the desulfurization efficiency is lowered because of the smaller value. Further, the content of CaF 2 is set to 3 to 10% by weight, when the content is less than 3% by weight, the ratio of the powdery slag increases, and when it exceeds 10% by weight, the content of Mg in the desulfurizing agent decreases. Decrease the desulfurization capacity, or Ca
This is because the wear of the refractory material becomes severe due to the influence of F 2 .
【００１０】[0010]
【実施例】脱硫鍋において、実施例及び比較例の脱硫剤
を溶銑中に、搬送ガスと共に浸漬ランスの先端から吹込
むことにより試験を行った。溶銑には、脱珪、脱燐を施
しておらず、しかも高炉スラグが存在したものを用い
た。なお、脱硫後のスラグは、脱硫鍋を傾動させること
によってスラグ鍋に排出させた。主な試験条件を以下に
示す。[Examples] In a desulfurization pot, a test was conducted by blowing the desulfurization agents of Examples and Comparative Examples into hot metal together with a carrier gas from the tip of an immersion lance. The hot metal used was not desiliconized or dephosphorized and had blast furnace slag. The desulfurized slag was discharged to the slag pan by tilting the desulfurization pan. The main test conditions are shown below.
【００１１】 溶銑量 ： １８０〜２００ｔ 溶銑温度 ： １２８０〜１３２０℃ 脱硫剤吹込速度 ： ８０〜１００kg/min 脱硫剤原単位 ： ２．５〜３．０kg/t 搬送ガス ： Ｎ2 搬送ガス量 ： １．０Ｎm3/min 脱硫剤の組成を変化させて実施した試験結果を表１に示
す。表中、転炉での復硫量は次式で定義し、0.003 ％未
満の場合を〇、0.003 ％以上の場合を×とした。Hot metal amount: 180 to 200t Hot metal temperature: 1280 to 1320 ° C Desulfurizing agent blowing rate: 80 to 100kg / min Desulfurizing agent basic unit: 2.5 to 3.0kg / t Carrier gas: N 2 Carrier gas amount: 1 Table 1 shows the results of tests conducted by changing the composition of the desulfurizing agent of 0.0 Nm 3 / min. In the table, the amount of resulfurization in the converter is defined by the following formula. When it is less than 0.003%, it is ◯, and when it is 0.003% or more, it is x.
【００１２】復硫量＝［Ｓ］Ｅｐ−［Ｓ］ｆ ［Ｓ］Ｅｐ：転炉吹止め後の溶鋼中のＳ濃度（％） ［Ｓ］ｆ ：脱硫処理後の溶銑中のＳ濃度 （％） また、鉄分ロス量は５kg/t未満の場合を〇、５kg/t以上
の場合を×とし、自然排滓の評価は、復硫量及び鉄分ロ
ス量の評価が両方〇の場合を〇、どちらか一方、或いは
両方×の場合を×とした。併せて、脱硫率は次式で定義
し、６０％以上のものを〇、６０％未満のものを×とし
た。Amount of re-sulfurization = [S] Ep− [S] f [S] Ep: S concentration (%) in molten steel after blowing in the converter [S] f: S concentration in hot metal after desulfurization treatment ( %) In addition, when the iron loss is less than 5 kg / t, it is ◯, when it is 5 kg / t or more, it is x, and the evaluation of natural slag is 〇 when the evaluation of both the sulfur content and the iron loss is 〇. In the case of either one or both of them, x was defined as x. At the same time, the desulfurization rate was defined by the following formula, with 60% or more being ◯ and less than 60% being x.
【００１３】脱硫率＝｛（［Ｓ］ｉ−［Ｓ］ｆ）／
［Ｓ］ｉ｝×１００（％） ［Ｓ］ｉ：脱硫処理前の溶銑中のＳ濃度（％） なお、総合評価は、自然排滓と脱硫率の評価が両方〇の
場合を〇、どちらか一方、或いは両方×の場合を×とし
た。Desulfurization rate = {([S] i- [S] f) /
[S] i} × 100 (%) [S] i: S concentration (%) in the hot metal before desulfurization treatment Note that the overall evaluation is ◯ when both natural waste and desulfurization rate are evaluated as 〇. One or both cases were marked with x.
【００１４】[0014]
【表１】 [Table 1]
【００１５】試験結果から、実施例ではいずれも、復硫
量及び鉄分ロス量それぞれ0.003 ％未満及び５kg/t未満
であり、自然排滓可能で、しかも脱硫率は６０％以上で
あった。一方、本発明範囲外の組成をもつ比較例の脱硫
剤では、自然排滓ができなかったか、脱硫率が６０％未
満であったか、或いはその両方であった。From the test results, in each of the examples, the amount of re-sulfurization and the amount of iron loss were less than 0.003% and less than 5 kg / t, respectively, and it was possible to discharge naturally, and the desulfurization rate was 60% or more. On the other hand, with the desulfurizing agent of the comparative example having a composition outside the scope of the present invention, natural slag was not formed, the desulfurization rate was less than 60%, or both.
【００１６】[0016]
【発明の効果】本発明の脱硫剤によれば脱珪、脱燐を施
しておらず、しかも高炉スラグが存在する溶銑に対し
て、高脱硫効率で、かつ復硫及び鉄分ロスを増加させる
ことなく自然排滓が可能な脱硫処理ができるようにな
る。また、この脱硫剤を用いた脱硫方法により排滓のた
めのドラッカー設備とその運転要員が不要となり、工場
の自動化及び無人化が可能となる。EFFECTS OF THE INVENTION According to the desulfurizing agent of the present invention, it is possible to increase desulfurization and iron loss with high desulfurization efficiency with respect to hot metal which is not subjected to desiliconization and dephosphorization and in which blast furnace slag is present. Without desulfurization, natural slag can be processed. In addition, the desulfurization method using this desulfurizing agent eliminates the need for a drucker facility for slag and its operating personnel, which enables automation and unmanned operation of the factory.
Claims (2)
６０重量％の範囲の組成物を重量割合で９０％以上含有
したものに、更にＣａＦ2 を３〜１０重量％配合したこ
とを特徴とする粉体状の溶銑脱硫剤。1. Metal Mg 5 to 30% by weight, CaO 95 to
A powdery hot metal desulfurizing agent characterized by containing 90% by weight or more of a composition in the range of 60% by weight and further containing 3 to 10% by weight of CaF 2 .
スラグが存在する溶銑に請求項１記載の脱硫剤を吹込む
ことにより脱硫することを特徴とする溶銑脱硫方法。2. A hot metal desulfurization method characterized in that desulfurization is carried out by blowing the desulfurizing agent according to claim 1 into the hot metal which has not been subjected to desiliconization and dephosphorization and in which blast furnace slag is present.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32614494A JP3574690B2 (en) | 1994-12-27 | 1994-12-27 | Hot metal desulfurization method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32614494A JP3574690B2 (en) | 1994-12-27 | 1994-12-27 | Hot metal desulfurization method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08176632A true JPH08176632A (en) | 1996-07-09 |
| JP3574690B2 JP3574690B2 (en) | 2004-10-06 |
Family
ID=18184549
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP32614494A Expired - Lifetime JP3574690B2 (en) | 1994-12-27 | 1994-12-27 | Hot metal desulfurization method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3574690B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100448626B1 (en) * | 2000-08-08 | 2004-09-13 | 주식회사 포스코 | Desulphurizer for iron hot metal using iron-making slag |
| CN106929624A (en) * | 2017-04-01 | 2017-07-07 | 首钢总公司 | A kind of compound fritting iron melt desulfurizing agent and its preparation and application |
-
1994
- 1994-12-27 JP JP32614494A patent/JP3574690B2/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100448626B1 (en) * | 2000-08-08 | 2004-09-13 | 주식회사 포스코 | Desulphurizer for iron hot metal using iron-making slag |
| CN106929624A (en) * | 2017-04-01 | 2017-07-07 | 首钢总公司 | A kind of compound fritting iron melt desulfurizing agent and its preparation and application |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3574690B2 (en) | 2004-10-06 |
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