JP2875579B2 - Hot metal desulfurizing agent - Google Patents
Hot metal desulfurizing agentInfo
- Publication number
- JP2875579B2 JP2875579B2 JP7497790A JP7497790A JP2875579B2 JP 2875579 B2 JP2875579 B2 JP 2875579B2 JP 7497790 A JP7497790 A JP 7497790A JP 7497790 A JP7497790 A JP 7497790A JP 2875579 B2 JP2875579 B2 JP 2875579B2
- Authority
- JP
- Japan
- Prior art keywords
- hot metal
- desulfurizing agent
- weight
- aluminum
- calcareous
- 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 - Lifetime
Links
Landscapes
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Description
【発明の詳細な説明】 産業上の利用分野 本発明は、溶銑中の硫黄分をインジェクション法によ
り効率的に除去するために用いられる溶銑脱硫剤に関す
る。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot metal desulfurizing agent used for efficiently removing a sulfur content in hot metal by an injection method.
従来技術 溶銑中の硫黄分を除去する方法として、溶銑中にイン
ジェクションランスを突込んで脱硫剤をキャリアガスに
よって溶銑内に吹込む方法が主に行われており、脱硫剤
として炭化カルシウムCaC2、炭酸ナトリウムNa2CO3、酸
化マグネシウムMgO、石灰質を主成分としたものなどが
使用されてきた。とくに最近ではコストや環境問題等の
面から石灰質をベースとした脱硫剤が多く使用されるよ
うになり、石灰質としては生石灰或いは石灰石が用いら
れ、これに脱硫効率を高めるため螢石、炭素質、金属ア
ルミニウム等が添加されていた。Prior art As a method of removing the sulfur content in hot metal, a method of inserting an injection lance into the hot metal and blowing a desulfurizing agent into the hot metal with a carrier gas is mainly performed, and calcium carbonate CaC 2 , carbonate as a desulfurizing agent is used. Sodium Na 2 CO 3 , magnesium oxide MgO, calcareous-based materials and the like have been used. In recent years, calcareous-based desulfurizing agents have been widely used in view of cost and environmental issues, and as calcareous materials, quicklime or limestone has been used. Metal aluminum and the like were added.
発明が解決しようとする課題 石灰質をベースとした脱硫剤において、脱硫効率を高
めるための助剤としては金属アルミニウムが最も有効で
あることが知られているが、金属アルミニウムはアルミ
ナAl2O3を原料とし、電気エネルギーを使用して製造さ
れるため非常に高価である。アルミニウムスクラップを
使用することも考えられるが、溶銑中に吹込むために粉
粒状に粉砕する必要があり、コスト高となる。Problems to be Solved by the Invention In a calcareous-based desulfurizing agent, it is known that metallic aluminum is the most effective as an auxiliary for increasing the desulfurizing efficiency, but metallic aluminum is made of alumina Al 2 O 3 . As a raw material, it is very expensive because it is manufactured using electrical energy. Although it is conceivable to use aluminum scrap, it is necessary to pulverize it into powder and granules in order to blow it into the hot metal, which increases the cost.
本発明は、かゝる問題を解消し、安価でかつ脱硫効率
の高い溶銑脱硫剤を提供することを目的とする。An object of the present invention is to solve such problems and to provide a hot metal desulfurizing agent that is inexpensive and has high desulfurization efficiency.
課題の解決手段 本発明の溶銑脱硫剤は、アルミニウム製造工程で副産
物として発生する安価なアルミニウム灰を用いることを
特徴とするものである。Means for Solving the Problems The hot metal desulfurizing agent of the present invention is characterized by using inexpensive aluminum ash generated as a by-product in an aluminum production process.
すなわち本発明の溶銑脱硫剤は、石灰質を主成分と
し、これに溶銑の脱硫効率を高めるために金属アルミニ
ウムを30〜50重量％含有し、残部がアルミナAl2O3であ
るアルミニウム灰、螢石及び炭素質を配合したことを特
徴とするものである。That is, the hot metal desulfurizing agent of the present invention contains calcareous material as a main component, contains 30 to 50% by weight of metallic aluminum in order to increase the desulfurization efficiency of hot metal, and the balance is aluminum ash or fluorite which is alumina Al 2 O 3. And carbonaceous materials.
作用 アルミニウム灰は、主成分がAl2O3であるが、アルミ
ニウム製造工程で発生した直後には、粒子状の金属アル
ミニウムを通常、30〜50重量％含有する。その中にはま
た粒径が1mm以上のインジェクションには適さない金属
アルミニウムも存在するが、このような粒径の金属アル
ミニウムは、アルミニウム製造用の原料として再使用さ
れるのが通例である。Action Aluminum ash is mainly composed of Al 2 O 3 , but immediately after being generated in the aluminum production process, usually contains 30 to 50% by weight of particulate metallic aluminum. Among them, there are metallic aluminum having a particle size of 1 mm or more which is not suitable for injection, but metallic aluminum having such a particle size is usually reused as a raw material for producing aluminum.
アルミニウム灰中の金属アルミニウムは、溶銑に溶解
し、溶銑の酸素ポテンシャルを低下させて脱硫条件を改
善する。The metallic aluminum in the aluminum ash dissolves in the hot metal, lowering the oxygen potential of the hot metal and improving desulfurization conditions.
またアルミニウム灰中のAl2O3は本発明の脱硫剤の主
成分である石灰質の融点を下げ、脱硫を促進する機能を
果す。Al 2 O 3 in the aluminum ash has a function of lowering the melting point of calcareous material, which is a main component of the desulfurizing agent of the present invention, and promoting desulfurization.
以上のように、アルミニウム灰は含有する金属アルミ
ニウム及びAl2O3により脱硫反応を促進させる機能を有
し、５重量％以上配合するのが望ましいが、アルミニウ
ム灰自体には脱硫作用はなく、20重量％以上の配合は、
脱硫の主体となる石灰質の配合比が低下するため好まし
くない。As described above, aluminum ash has a function of accelerating the desulfurization reaction by the contained metallic aluminum and Al 2 O 3 , and is desirably incorporated in an amount of 5% by weight or more. For more than weight%,
It is not preferable because the mixing ratio of calcareous material which is the main component of desulfurization decreases.
石灰質は、脱硫の基本成分であり、65重量％以上配合
する必要がある。Calcareous is a basic component of desulfurization and needs to be blended in an amount of 65% by weight or more.
石灰質としては主として生石灰が使用されるが、一部
に安価な石灰石を使用することもできる。石灰石はしか
しながら溶銑中に入ると、CaOとCO2に分解し、多量のガ
スを発生して溶銑の吹出し現象を発生するようになるた
め使用するにしても20重量％以下とするのが望ましい。As the calcareous material, quick lime is mainly used, but inexpensive limestone can also be used partially. However, when limestone enters the hot metal, it is decomposed into CaO and CO 2 , generating a large amount of gas and causing the hot metal to be blown out.
炭素質は脱硫反応により発生する酵素を金属アルミニ
ウムとともに消費し、脱硫反応を促進するとともに脱硫
剤の流動性を改善する機能も有しており、そのためには
５重量％以上配合する必要があるが、アルミニウム灰と
同様、炭素質自体に脱硫作用があるわけではないため15
重量％以下とするのが望ましい。Carbonaceous material consumes enzymes generated by the desulfurization reaction together with metallic aluminum, and has a function of accelerating the desulfurization reaction and improving the fluidity of the desulfurizing agent. For this purpose, it is necessary to mix 5% by weight or more. As with aluminum ash, carbonaceous materials do not necessarily have a desulfurizing action.
% By weight or less.
螢石は、Al2O3と同様、石灰質の融点を下げ、脱硫を
促進するために配合されるが、高価であるため10重量％
未満とする。Fluorite, like Al 2 O 3, is used to lower the melting point of calcareous material and to promote desulfurization.
Less than
実施例 別表に示されるように、生石灰63重量％、石灰石14重
量％、螢石４重量％、炭素質９重量％及び金属アルミニ
ウム40重量％、Al2O3 60重量％よりなるアルミニウム灰
10重量％とからなる脱硫剤を使用し、硫黄分を0.025〜
0.035％含有する160〜186tonの溶銑に常法のようにして
インジェクションした。その結果を図に示す。As shown in the examples attached table, quicklime 63 wt%, limestone 14 wt%, fluorite 4 wt%, carbonaceous 9 wt% and the metal aluminum 40 wt%, Al 2 O 3 60 wt% from the consisting of aluminum ash
Use a desulfurizing agent consisting of 10% by weight, and reduce the sulfur content from 0.025 to
It was injected into a hot metal of 160 to 186 tons containing 0.035% in a conventional manner. The result is shown in the figure.
比較例１ 生石灰70重量％、石灰石15重量％、螢石５重量％、炭
素質10重量％とからなる脱硫剤を使用し、実施例と同じ
条件の溶銑にインジェクションした。Comparative Example 1 Using a desulfurizing agent composed of quicklime 70% by weight, limestone 15% by weight, fluorite 5% by weight, and carbonaceous 10% by weight, injection was performed on hot metal under the same conditions as in the example.
結果を図に示す。 The results are shown in the figure.
比較例２ 生石灰63重量％、石灰石14重量％、螢石４重量％、炭
素質９重量％、金属アルミニウム10重量％とからなる脱
硫剤を使用し、実施例と同じ条件の溶銑にインジェクシ
ョンした。結果を図に示す。Comparative Example 2 Using a desulfurizing agent comprising 63% by weight of quicklime, 14% by weight of limestone, 4% by weight of fluorite, 9% by weight of carbonaceous material and 10% by weight of metallic aluminum, injection was performed on hot metal under the same conditions as in the example. The results are shown in the figure.
実施例と比較例１及び２を比較すると、溶銑中の硫黄
分を0.010％とするために必要な脱硫剤量は、比較例１
の8kg/溶銑1tonに対し、本実施例では5kg/溶銑1tonと大
幅に減少した。また溶銑中の硫黄分を0.005％とするた
めに必要な脱硫剤量は比較例２の13kg/溶銑1tonに対
し、本実施例では9kg/溶銑1tonと、安価なアルミニウム
灰を使用しているにもかゝわらず大幅に減少させること
ができた。Comparing the Example with Comparative Examples 1 and 2, the amount of desulfurizing agent required to reduce the sulfur content in the hot metal to 0.010% is shown in Comparative Example 1.
In the present example, this was significantly reduced to 5 kg / hot metal of 1 ton compared to 8 kg / hot metal of 1 ton. In addition, the amount of desulfurizing agent required to reduce the sulfur content in the hot metal to 0.005% is 13 kg / ton of hot metal of Comparative Example 2, whereas 9 kg / ton of hot metal is used in this example. Nevertheless, it could be greatly reduced.
発明の効果 本発明の溶銑脱硫剤によれば以上のように金属アルミ
ニウムよりも安価なアルミニウム灰を配合しているにも
かゝわらず、高い脱硫作用が得られ、コストを低減させ
ることができる。Effect of the Invention According to the hot metal desulfurizing agent of the present invention, a high desulfurization action can be obtained and cost can be reduced despite the fact that aluminum ash which is cheaper than metal aluminum is blended as described above. .
図は脱硫剤使用量と溶銑中硫黄分との関係を示すグラフ
図である。The figure is a graph showing the relationship between the amount of desulfurizing agent used and the sulfur content in the hot metal.
Claims (3)
り除去するために用いる溶銑脱硫剤であって、石灰質を
主成分とし、これに溶銑の脱硫効率を高めるために金属
アルミニウムを30〜50重量％含有し、残部がアルミナAl
2O3であるアルミニウム灰、螢石及び炭素質を配合した
ことを特徴とする溶銑脱硫剤。1. A hot metal desulfurizing agent used for removing a sulfur content in hot metal by an injection method, wherein the hot metal desulfurizing agent is composed mainly of calcareous material and contains 30 to 50% by weight of metallic aluminum in order to enhance the desulfurizing efficiency of hot metal. Contains, the remainder is alumina Al
A hot metal desulfurizing agent containing 2 O 3 aluminum ash, fluorite and carbonaceous material.
80重量％、螢石10重量％未満、炭素質５〜15重量％から
なる請求項１記載の溶銑脱硫剤。2. Aluminum ash 5-20% by weight, calcareous 65-
2. The hot metal desulfurizing agent according to claim 1, comprising 80% by weight, less than 10% by weight of fluorite, and 5 to 15% by weight of carbonaceous material.
請求項２記載の溶銑脱硫剤。3. The hot metal desulfurizing agent according to claim 2, wherein the calcareous material contains 20% by weight or less of limestone.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7497790A JP2875579B2 (en) | 1990-03-22 | 1990-03-22 | Hot metal desulfurizing agent |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7497790A JP2875579B2 (en) | 1990-03-22 | 1990-03-22 | Hot metal desulfurizing agent |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03274217A JPH03274217A (en) | 1991-12-05 |
| JP2875579B2 true JP2875579B2 (en) | 1999-03-31 |
Family
ID=13562861
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7497790A Expired - Lifetime JP2875579B2 (en) | 1990-03-22 | 1990-03-22 | Hot metal desulfurizing agent |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2875579B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4936787B2 (en) * | 2006-05-12 | 2012-05-23 | 日新製鋼株式会社 | Desulfurization refining agent and desulfurization method for Cr-containing hot metal |
| JP5481899B2 (en) * | 2009-03-26 | 2014-04-23 | Ｊｆｅスチール株式会社 | Hot metal desulfurization agent and desulfurization treatment method |
-
1990
- 1990-03-22 JP JP7497790A patent/JP2875579B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03274217A (en) | 1991-12-05 |
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