JPH03274217A - Desulfurizing agent for molten iron - Google Patents
Desulfurizing agent for molten ironInfo
- Publication number
- JPH03274217A JPH03274217A JP7497790A JP7497790A JPH03274217A JP H03274217 A JPH03274217 A JP H03274217A JP 7497790 A JP7497790 A JP 7497790A JP 7497790 A JP7497790 A JP 7497790A JP H03274217 A JPH03274217 A JP H03274217A
- Authority
- JP
- Japan
- Prior art keywords
- aluminum
- weight
- hot metal
- agent
- desulfurization
- 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
- 239000003795 chemical substances by application Substances 0.000 title claims abstract description 25
- 230000003009 desulfurizing effect Effects 0.000 title abstract description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title 2
- 229910052742 iron Inorganic materials 0.000 title 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 38
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 30
- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 30
- 230000023556 desulfurization Effects 0.000 claims abstract description 30
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims abstract description 10
- 239000010436 fluorite Substances 0.000 claims abstract description 10
- 239000003575 carbonaceous material Substances 0.000 claims abstract description 8
- 239000000463 material Substances 0.000 claims abstract description 8
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 3
- 229910052751 metal Inorganic materials 0.000 claims description 33
- 239000002184 metal Substances 0.000 claims description 33
- 235000019738 Limestone Nutrition 0.000 claims description 12
- 239000006028 limestone Substances 0.000 claims description 12
- 239000000126 substance Substances 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 3
- 239000006227 byproduct Substances 0.000 abstract description 2
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 12
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 6
- 239000000292 calcium oxide Substances 0.000 description 6
- 235000012255 calcium oxide Nutrition 0.000 description 6
- 229910052717 sulfur Inorganic materials 0.000 description 6
- 239000011593 sulfur Substances 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 229910000805 Pig iron Inorganic materials 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 102000004190 Enzymes Human genes 0.000 description 1
- 108090000790 Enzymes Proteins 0.000 description 1
- 239000002956 ash Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- -1 carbonaceous Chemical compound 0.000 description 1
- 239000012159 carrier gas Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
Landscapes
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
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
。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a hot metal desulfurization agent used for efficiently removing sulfur content from 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ＮａｚＣ
Ｏａ、酸化マグネシウムＭｇＯ１石灰質を主成分とした
ものなどが使用されてきた。Conventional technology The main method for removing sulfur from hot metal is to insert an injection lance into the hot metal and inject a desulfurizing agent into the hot metal using a carrier gas. NazC
Oa, magnesium oxide MgO1, which has calcareous material as its main component, etc. have been used.
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。Particularly recently, calcareous-based desulfurization agents have come into widespread use due to cost and environmental concerns.The limestone used is quicklime or limestone, and in order to increase the desulfurization efficiency, fluorite, carbonaceous, Metallic aluminum etc. 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
Ａ１．０３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 It is known that metal aluminum is the most effective auxiliary agent for increasing desulfurization efficiency in calcareous-based desulfurization agents, but metal aluminum is made from alumina A1.03 as a raw material. It is very expensive because it is manufactured using electrical energy. Although it is possible to use aluminum scrap, it would be costly because it would need to be pulverized into powder to be injected into the hot metal.
本発明は、か＼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。The object of the present invention is to solve these problems and provide a hot metal desulfurization 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 desulfurization agent of the present invention is characterized in that it uses inexpensive aluminum ash generated as a by-product in the aluminum manufacturing process.
すなわち本発明の溶銑脱硫剤は、石灰質を主成分とし、
これに金属アルミニウムを３０〜５０重量％含有し、残
部がアル逅すＡｌ□０．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 desulfurization agent of the present invention has limestone as a main component,
This contains 30 to 50% by weight of metallic aluminum, and the balance is Al□0. It is characterized by containing aluminum ash, fluorite, and carbonaceous material.
作用
アルミニウム灰は、主成分がＡｌｔｏｓであるが、アル
逅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１ｍ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。Working aluminum ash is mainly composed of Altos, but immediately after it is generated in the aluminum production process, it usually contains 30 to 50% by weight of particulate metallic aluminum. Among them, there is also metal aluminum with a particle size of 1 m or more that is not suitable for injection, but metal aluminum with such a particle size is usually reused as a raw material for aluminum production.
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。Metallic aluminum in aluminum ash dissolves into 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Ａｈ０３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。Furthermore, Ah03 in the aluminum ash functions to lower the melting point of limestone, which is the main component of the desulfurization agent of the present invention, and to promote 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＾Ｉｔ’ｓ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 mentioned above, aluminum ash has the function of accelerating the desulfurization reaction due to the metal aluminum and ^It's it contains, and it is desirable to mix it in at least 5% by weight, but aluminum ash itself has no desulfurization effect and A blending ratio of more than % by weight is not preferable because the blending ratio of limestone, which is the main component of desulfurization, decreases.
石灰質は、脱硫の基本成分てあり、６５重量％以上配合
する必要がある。Calcareous material is a basic component of desulfurization and needs to be added 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ＣＯ！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。Quicklime is mainly used as the calcareous material, but inexpensive limestone can also be used in part. However, when limestone enters hot metal, it produces CaO and CO! It decomposes into 20% by weight or less, producing a large amount of gas and causing the phenomenon of hot metal blowing 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 has the function of consuming the enzyme generated by the desulfurization reaction together with metal aluminum, promoting the desulfurization reaction, and improving the fluidity of the desulfurizing agent.
Although it is necessary to mix at least 15% by weight, since carbonaceous material itself does not have a desulfurization effect like aluminum ash.
It is desirable that the amount is less than % by weight.
螢石は、Ａｌｔｏｓ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。Like Altos, fluorite is blended to lower the melting point of calcareous material and promote desulfurization, but it is expensive and is therefore used in an amount of less than 10% by weight.
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％、ＡｌｘｏＪＯ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１６０〜１８６
ｔｏｎの溶銑に常法のようにしてインショクジョンした
。その結果を図に示す。As shown in the attached table of examples, quicklime 63% by weight, limestone 14%
Using a desulfurizing agent consisting of 4% by weight of fluorite, 9% by weight of carbon, 40% by weight of metal aluminum, and 10% by weight of aluminum ash consisting of % by weight of AlxoJO, the sulfur content was reduced to 0.025 to 0.035. % containing 160-186
It was injected into tons of hot metal in the usual manner. The results are 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
同し条件の溶銑にインジェクションした。Comparative Example 1 Quicklime 70% by weight, limestone 15% by weight, fluorite 5% by weight,
A desulfurization agent consisting of 10% by weight of carbonaceous material was used and injected into 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、実施例と同し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 Quicklime 63% by weight, limestone 14% by weight, fluorite 4% by weight,
A desulfurizing agent consisting of 9% by weight of carbonaceous material and 10% by weight of metallic aluminum was used and was injected into 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８ ｋｇ／ｉ銑１ ｔｏｎに対し、本実施例では５
ｋｇ／溶銑１ ｔｏｎ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１３睦／溶銑１ ｔｏｎに対し、本実施例では
９ ｋｇ／ｉ銑ｌ ｔｏｎと、安価なアルミニウム灰を
使用しているにもか＼わらず大幅に減少させることがで
きた。Comparing Example and Comparative Examples 1 and 2, the amount of desulfurization agent required to reduce the sulfur content in hot metal to 0.010% is 8 kg/i 1 ton of pig iron in Comparative Example 1, while in this example So 5
kg/1 ton of hot metal, a significant decrease. In addition, the amount of desulfurization agent required to reduce the sulfur content in hot metal to 0.005% was 13 mu/1 ton of hot metal in Comparative Example 2, but in this example it was 9 kg/1 ton of pig iron, which is cheap aluminum. Despite using ash, we were able to significantly reduce the amount.
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
＼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。Effects of the Invention According to the hot metal desulfurization agent of the present invention, a high desulfurization effect can be obtained and costs can be reduced even though 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。
表The figure is a graph showing the relationship between the amount of desulfurization agent used and the sulfur content in hot metal. table
Claims (3)
３０〜５０重量％含有し、残部がアルミナＡｌ＿２Ｏ＿
３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) The main component is calcareous material, which contains 30 to 50% by weight of metallic aluminum, and the balance is alumina Al_2O_
3. A hot metal desulfurization agent characterized by containing aluminum ash, fluorite and carbonaceous matter.
０重量％、螢石１０重量％未満、炭素質５〜１５重量％
とからなる請求項１記載の溶銑脱硫剤。(2) Aluminum ash 5-20% by weight, limestone 65-8
0% by weight, less than 10% by weight of fluorite, 5-15% by weight of carbonaceous material
The hot metal desulfurization agent according to claim 1, comprising:
項２記載の溶銑脱硫剤。(3) The hot metal desulfurization agent according to claim 2, wherein the calcareous substance 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 true JPH03274217A (en) | 1991-12-05 |
| JP2875579B2 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) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007302961A (en) * | 2006-05-12 | 2007-11-22 | Nisshin Steel Co Ltd | Desulfurizing refining agent for molten iron containing chromium and desulfurizing method |
| JP2010229439A (en) * | 2009-03-26 | 2010-10-14 | Jfe Steel Corp | Desulfurizing agent for molten pig iron, and desulfurizing method |
-
1990
- 1990-03-22 JP JP7497790A patent/JP2875579B2/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007302961A (en) * | 2006-05-12 | 2007-11-22 | Nisshin Steel Co Ltd | Desulfurizing refining agent for molten iron containing chromium and desulfurizing method |
| JP2010229439A (en) * | 2009-03-26 | 2010-10-14 | Jfe Steel Corp | Desulfurizing agent for molten pig iron, and desulfurizing method |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2875579B2 (en) | 1999-03-31 |
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