JP2000044298A - How to prevent powdered reduced slag - Google Patents
How to prevent powdered reduced slagInfo
- Publication number
- JP2000044298A JP2000044298A JP10217621A JP21762198A JP2000044298A JP 2000044298 A JP2000044298 A JP 2000044298A JP 10217621 A JP10217621 A JP 10217621A JP 21762198 A JP21762198 A JP 21762198A JP 2000044298 A JP2000044298 A JP 2000044298A
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- Prior art keywords
- slag
- concentration
- weight
- less
- reduced
- Prior art date
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- Treatment Of Steel In Its Molten State (AREA)
- Furnace Details (AREA)
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Abstract
(57)【要約】
【課題】 金属精錬炉から発生する還元スラグの粉化を
防止する方法を提供する。
【解決手段】 (1) 還元スラグに発熱剤：ＦｅＯまたは
／およびＦｅを、添加剤：Ｂ2 Ｏ3 を添加し、酸素を含
有するガスを前記スラグに吹き込み、処理後のスラグ中
のＦｅ2 Ｏ3 濃度を重量％で１％以上３％未満、スラグ
中のＢ2 Ｏ3濃度を重量％で０．１％以上１％以下とす
る。(2) 上記(1) と同様な方法で、処理後のスラグ中の
Ｆｅ2 Ｏ3 濃度を重量％で１％以上３％未満、スラグ中
のＰ2Ｏ5 濃度を重量％で０．２％以上１．５％以下と
する。(3) 上記(1) と同様な方法で、処理後のスラグ中
のＦｅ2 Ｏ3 濃度を重量％で１％以上３％未満、スラグ
中のＡｌ2 Ｏ3 濃度を重量％で２％以上１５％以下とす
る。
(57) [Problem] To provide a method for preventing powdered reduced slag generated from a metal smelting furnace. SOLUTION: (1) An exothermic agent: FeO and / or Fe and an additive: B 2 O 3 are added to reduced slag, and a gas containing oxygen is blown into the slag, and Fe 2 in the treated slag is added. The O 3 concentration is 1% or more and less than 3% by weight, and the B 2 O 3 concentration in the slag is 0.1% or more and 1% or less by weight. (2) In the same manner as in (1), the concentration of Fe 2 O 3 in the slag after treatment is 1% or more and less than 3% by weight, and the concentration of P 2 O 5 in the slag is 0.2% by weight. % To 1.5%. (3) In the same manner as in (1) above, the concentration of Fe 2 O 3 in the treated slag is 1% or more and less than 3% by weight, and the concentration of Al 2 O 3 in the slag is 2% or more in weight%. 15% or less.
Description
【０００１】[0001]
【発明の属する技術分野】本発明はステンレス鋼、炭素
鋼、合金鋼、その他の合金を製造する際に発生する還元
スラグの粉化を防止する方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for preventing powdered reduced slag generated during the production of stainless steel, carbon steel, alloy steel and other alloys.
【０００２】[0002]
【従来の技術】転炉、アルゴン−酸素脱炭炉（ＡＯＤ）
および電気炉等でステンレス鋼を製造する場合は脱炭工
程でクロムが酸化されるので、その後にフェロシリコン
を主体とした合金を添加して、酸化クロムを溶鋼中に還
元回収する方法が採用されている。炭素鋼、合金鋼等を
製造する場合も脱炭工程で鉄、マンガンおよびクロム等
の有価金属が酸化しスラグ中に損失するので、フェロシ
リコンやアルミニウム合金等の合金を添加して、それら
の酸化物を溶鋼中に還元回収する方法が採用されてい
る。2. Description of the Related Art Converters, argon-oxygen decarburization furnaces (AOD)
When producing stainless steel in an electric furnace, etc., chromium is oxidized in the decarburization process.Therefore, a method has been adopted in which an alloy mainly composed of ferrosilicon is added, and chromium oxide is reduced and recovered in the molten steel. ing. When producing carbon steel, alloy steel, etc., valuable metals such as iron, manganese and chromium are oxidized and lost in the slag during the decarburization process, so alloys such as ferrosilicon and aluminum alloys are added to oxidize them. A method of reducing and recovering material in molten steel has been adopted.
【０００３】上記の有価金属を還元回収した後に生成す
るスラグを還元スラグと称し、この還元スラグはメタル
分を分離後に、埋立に利用されるのが一般的である。し
かし、還元スラグは粉化し易く、埋立時に粉塵が発生し
環境上の問題があり改善が求められている。[0003] The slag generated after the above-mentioned valuable metal is reduced and recovered is referred to as a reduced slag, and this reduced slag is generally used for landfill after separating a metal component. However, the reduced slag is easily pulverized, dust is generated at the time of landfill, and there is an environmental problem.
【０００４】還元スラグの粉化は、スラグ中の２ＣａＯ
・ＳｉＯ2 が冷却過程で粉化し易いγ−２ＣａＯ・Ｓｉ
Ｏ2 に変態することによって起こることが知られてい
る。この対策として、従来よりスラグに酸化硼素、シリ
カ、アルミナ、五酸化燐等を含む改質剤を添加すること
により、γ−２ＣａＯ・ＳｉＯ2 への変態を抑制し、粉
化し難いβ−２ＣａＯ・ＳｉＯ2 変態にとどめる方法が
既に開示されている。[0004] The reduction slag is powdered by 2CaO in the slag.
• γ-2CaO · Si where SiO 2 is easily powdered during the cooling process
It is known to occur by transformation in O 2. As a countermeasure, a modifier containing boron oxide, silica, alumina, phosphorus pentoxide and the like is conventionally added to the slag to suppress the transformation to γ-2CaO.SiO 2 and make β-2CaO. A method for limiting the SiO 2 transformation has already been disclosed.
【０００５】[0005]
【発明が解決しようとする課題】しかし、この方法は、
精錬炉からスラグ鍋へ還元スラグを排出時に改質剤を添
加混合する方式であり、スラグ鍋に排出したスラグはそ
の保有熱を大気冷却により放散し、スラグ固化が早く進
むため、均一混合が困難であり、改質剤を添加する効果
が十分なものでなかった。精錬炉内で改質剤を添加して
強撹拌することも考えられるが、その場合はメタル側の
温度が低下するという問題が発生し、スラグ中へのメタ
ルロスが多くなり、メタル組成の管理も難しく問題であ
った。However, this method is
A method in which a reducing agent is added and mixed when the reduced slag is discharged from the smelting furnace to the slag pan. And the effect of adding the modifier was not sufficient. It is also conceivable to add a modifying agent in a smelting furnace and perform vigorous stirring.However, in this case, there is a problem that the temperature on the metal side decreases, and the metal loss in the slag increases, and the management of the metal composition also becomes difficult. It was a difficult problem.
【０００６】特開昭５９−２０４１４号公報には、還元
スラグを混合するための手段として、不活性ガスによっ
て撹拌する方法が開示されている。しかし、この方法で
は不活性ガスによる熱放散が加わり、急冷化を促進し目
的の攪拌が不十分となり、粉化の防止に十分な効果を挙
げることができないという問題があった。本発明の目的
は、還元スラグの粉化を防止する方法を提供することに
ある。JP-A-59-20414 discloses a method for mixing reduced slag with stirring using an inert gas. However, this method has a problem in that heat dissipation by an inert gas is added, quenching is promoted, the intended stirring becomes insufficient, and a sufficient effect for preventing powdering cannot be obtained. An object of the present invention is to provide a method for preventing powdered reduced slag.
【０００７】[0007]
【課題を解決するための手段】発明者は、改質剤を均一
に混合することが重要であると考え、種々検討を重ねた
結果、下記の(A) および(D) の知見を得た。Means for Solving the Problems The inventor considered that it is important to mix the modifier uniformly, and as a result of various studies, obtained the following findings (A) and (D). .
【０００８】(A) 溶融還元スラグに発熱剤を添加し酸素
を吹き込むことにより、スラグは加熱・保温され溶解状
態を維持でき、十分良好な流動性が保たれ、スラグの均
一混合が促進される。(A) By adding an exothermic agent to the molten reduction slag and injecting oxygen, the slag can be heated and kept warm to maintain a dissolved state, sufficiently satisfactory fluidity is maintained, and uniform mixing of the slag is promoted. .
【０００９】(B) 発熱剤として酸化第一鉄（以下、Ｆｅ
Ｏと記載する）または／および金属鉄（以下、Ｆｅと記
載する）を、添加剤としてＢ2 Ｏ3 を還元スラグ中に添
加し処理後のスラグ中のＢ2 Ｏ3 濃度を重量％で０．１
％以上１％以下とすることにより、処理後のスラグ中の
Ｆｅ2 Ｏ3 濃度を重量％で１％以上３％未満の低濃度に
抑えて、十分良好なスラグの流動性が保たれ、スラグの
均一混合が達成できる。(B) Ferrous oxide (hereinafter referred to as Fe)
O) or / and metallic iron (hereinafter referred to as Fe) is added as an additive to B 2 O 3 in the reduced slag, and the B 2 O 3 concentration in the treated slag is reduced to 0% by weight. .1
% To 1%, the Fe 2 O 3 concentration in the treated slag is suppressed to a low concentration of 1% to less than 3% by weight, and a sufficiently good fluidity of the slag is maintained. Can be achieved.
【００１０】(C) Ｂ2 Ｏ3 をＰ2 Ｏ5 に替えても、処理
後のスラグ中のＰ2 Ｏ5 濃度が重量％で０．２％以上
１．５％以下であれば、処理後のスラグ中のＦｅ2 Ｏ3
濃度を重量％で１％以上３％未満の低濃度に抑えて、十
分良好なスラグの流動性が保たれ、スラグの均一混合が
達成できる。[0010] be replaced with (C) B 2 O 3 to P 2 O 5, P 2 O 5 concentration in the slag after treatment is equal to or less than 1.5% 0.2% or more by weight%, processing Fe 2 O 3 in slag after
By controlling the concentration to a low concentration of 1% or more and less than 3% by weight, sufficiently good fluidity of the slag is maintained, and uniform mixing of the slag can be achieved.
【００１１】(D) 同様にＡｌ2 Ｏ3 に替えても、処理後
のスラグ中のＡｌ2 Ｏ3 濃度が重量％で２％以上１５％
以下であれば、処理後のスラグ中のＦｅ2 Ｏ3 濃度を重
量％で１％以上３％未満の低濃度に抑えて、十分良好な
スラグの流動性が保たれ、スラグの均一混合が達成でき
る。(D) Similarly, when Al 2 O 3 is used, the concentration of Al 2 O 3 in the slag after the treatment is 2% or more and 15% or more by weight.
If it is below, the concentration of Fe 2 O 3 in the slag after the treatment is suppressed to a low concentration of 1% or more and less than 3% by weight, sufficiently good slag fluidity is maintained, and uniform mixing of the slag is achieved. it can.
【００１２】本発明は、以上の知見に基づいてなされた
もので、その要旨は下記(1) 〜（３）である。 （１） 金属精錬炉で生成した還元スラグ中のメタル分
を分離した溶融スラグを収容した容器内に発熱剤として
ＦｅＯまたは／およびＦｅを、添加剤としてＢ2 Ｏ3 を
添加するとともに、酸素を含有するガスを該スラグに吹
き込み、処理後のスラグ中のＦｅ2 Ｏ3 濃度を重量％で
１％以上３％未満、スラグ中のＢ2 Ｏ3 濃度を重量％で
０．１％以上１％以下とすることを特徴とする還元スラ
グの粉化を防止する方法。The present invention has been made based on the above findings, and the gist thereof is as follows (1) to (3). (1) FeO and / or Fe as a heating agent and B 2 O 3 as an additive are added to a vessel containing molten slag in which metal components in reduced slag generated in a metal refining furnace are separated, and oxygen is added. The contained gas is blown into the slag, and the Fe 2 O 3 concentration in the treated slag is 1% or more and less than 3% by weight, and the B 2 O 3 concentration in the slag is 0.1% or more 1% by weight. A method for preventing reduction slag from being powdered, characterized by the following.
【００１３】(2) 金属精錬炉で生成した還元スラグ中の
メタル分を分離した溶融スラグを収容した容器内に発熱
剤としてＦｅＯまたは／およびＦｅを、添加剤としてＰ
2 Ｏ5 を添加するとともに、酸素を含有するガスを該ス
ラグに吹き込み、処理後のスラグ中のＦｅ2 Ｏ3 濃度を
重量％で１％以上３％未満、スラグ中のＰ2 Ｏ5 濃度を
重量％で０．２％以上１．５％以下とすることを特徴と
する還元スラグの粉化を防止する方法。(2) FeO or / and Fe as a heating agent and P as an additive in a vessel containing a molten slag in which metal components in a reduced slag generated in a metal refining furnace are separated.
While adding 2 O 5 , a gas containing oxygen is blown into the slag, and the Fe 2 O 3 concentration in the slag after the treatment is 1% or more and less than 3% by weight, and the P 2 O 5 concentration in the slag is reduced. A method for preventing pulverization of reduced slag, wherein the weight percentage is from 0.2% to 1.5%.
【００１４】(3) 金属精錬炉で生成した還元スラグ中の
メタル分を分離した溶融スラグを収容した容器内に発熱
剤としてＦｅＯまたは／およびＦｅを、添加剤としてＡ
ｌ2Ｏ3 を添加するとともに、酸素を含有するガスを該
スラグに吹き込み、処理後のスラグ中のＦｅ2 Ｏ3 濃度
を重量％で１％以上３％未満、スラグ中のＡｌ2 Ｏ3濃
度を重量％で２％以上１５％以下とすることを特徴とす
る還元スラグの粉化を防止する方法。(3) FeO or / and Fe as a heating agent and A as an additive in a vessel containing a molten slag in which metal components in a reduced slag generated in a metal refining furnace are separated.
While adding l 2 O 3 , a gas containing oxygen was blown into the slag, and the Fe 2 O 3 concentration in the treated slag was 1% or more and less than 3% by weight, and the Al 2 O 3 concentration in the slag was Of reducing slag to 2% or more and 15% or less by weight.
【００１５】[0015]
【発明の実施の形態】転炉、アルゴン−酸素脱炭炉（Ａ
ＯＤ）、電気炉等の金属精錬炉でステンレス鋼、炭素
鋼、合金鋼等の溶融合金を製造する際に生成した還元ス
ラグからメタル分を分離後にスラグ容器に保持する。こ
のメタル分を分離したスラグを以下、単に還元スラグま
たはスラグともいう。DESCRIPTION OF THE PREFERRED EMBODIMENTS A converter, an argon-oxygen decarburizer (A)
OD), a metal component is separated from reduced slag generated when a molten alloy such as stainless steel, carbon steel, or alloy steel is produced in a metal refining furnace such as an electric furnace, and then held in a slag container. Hereinafter, the slag from which the metal component is separated is simply referred to as reduced slag or slag.
【００１６】図１は、本発明で使用するスラグ処理設備
の一例を示す模式的な概念図である。図１に示すよう
に、メタル分を分離した還元スラグ４を収納したスラグ
容器１にホッパー２から発熱剤としてＦｅＯまたは／お
よびＦｅを添加し、さらに、添加剤としてＢ2 Ｏ3 、Ｐ
2 Ｏ5 、またはＡｌ2 Ｏ3 を適正量添加した後に、ラン
ス３から酸素を含有するガスを還元スラグ中に吹き込
む。スラグ容器１の材質は、鋳鉄製または耐火物で内張
りされているものでも良い。FIG. 1 is a schematic conceptual diagram showing an example of a slag processing facility used in the present invention. As shown in FIG. 1, FeO or / and Fe is added as a heating agent from a hopper 2 to a slag container 1 containing reduced slag 4 from which metal has been separated, and B 2 O 3 and P are added as additives.
After adding an appropriate amount of 2 O 5 or Al 2 O 3 , a gas containing oxygen is blown into the reduced slag from the lance 3. The material of the slag container 1 may be cast iron or a refractory lining.
【００１７】本発明において、酸素を含有するガスを吹
き込むのはＦｅＯまたは／およびＦｅを酸化し、それぞ
れ最終的にＦｅ2 Ｏ3 を生成させて、このときの生成熱
（酸化反応熱）によってスラグ温度の低下を抑制できス
ラグの流動性が確保でき、添加物を均一に分散できるか
らである。In the present invention, the gas containing oxygen is blown by oxidizing FeO and / or Fe, and finally producing Fe 2 O 3, and slag by the heat of formation (heat of oxidation reaction). This is because a decrease in temperature can be suppressed, the fluidity of the slag can be secured, and the additive can be uniformly dispersed.
【００１８】ＦｅＯ材としてはミルスケール等が、Ｆｅ
材としては粒鉄等が、酸素を含有するガスとしては純酸
素上吹き転炉用の工業用酸素が使用できる。As the FeO material, mill scale or the like is used.
As the material, granular iron or the like can be used, and as the oxygen-containing gas, industrial oxygen for a pure oxygen top-blowing converter can be used.
【００１９】処理後のスラグ中のＦｅ2 Ｏ3 濃度が重量
％で１％以上３％未満とする理由は、Ｆｅ2 Ｏ3 が３％
以上なら流動性の問題はないが、ＦｅＯ材、Ｆｅ材の添
加量および酸素量が増加しコストアップになるため発熱
剤を最小限にして、なおかつ流動性を確保することを本
発明は目的としているからである。The reason why the concentration of Fe 2 O 3 in the slag after the treatment is 1% or more and less than 3% by weight is that Fe 2 O 3 is 3% by weight.
Although there is no problem of fluidity as described above, the purpose of the present invention is to minimize the exothermic agent and secure fluidity because the amount of addition of FeO material and Fe material and the amount of oxygen increase and cost increases. Because there is.
【００２０】Ｂ2 Ｏ3 、Ｐ2 Ｏ5 、またはＡｌ2 Ｏ3 を
還元スラグ中に適正量添加する理由は、処理後のスラグ
中のＦｅ2 Ｏ3 濃度が重量％で１％以上３％未満の低濃
度でもスラグの流動性を確保できるからである。The reason for adding an appropriate amount of B 2 O 3 , P 2 O 5 or Al 2 O 3 to the reduced slag is that the concentration of Fe 2 O 3 in the treated slag is 1% to 3% by weight. This is because the fluidity of the slag can be ensured even at a low concentration of less than.
【００２１】以下、スラグ中の各成分の濃度は全て重量
％を示し、単に％で示す。処理後のスラグ中のＢ2 Ｏ3
濃度が０．１％以上１％以下であれば、処理後のスラグ
中のＦｅ2 Ｏ3 濃度が１％以上３％未満の低濃度であっ
ても還元スラグの流動性を確保することができる。スラ
グ中のＢ2 Ｏ3 濃度が、０．１％未満では、スラグ中の
Ｆｅ2 Ｏ3 濃度が３％以上でないと流動性が低下するお
それがあり、スラグ中のＢ2 Ｏ3 濃度が１％を超えると
流動性を確保する効果が飽和し過剰添加となるおそれが
あり経済的ではない。好ましい範囲は、０．３〜０．８
％である。Ｂ2 Ｏ3 材としては、Ｂ2 Ｏ3 含有濃度約３
０％の酸化硼素含有物等が使用できる。Hereinafter, all the concentrations of the respective components in the slag are indicated by% by weight, and are simply indicated by%. B 2 O 3 in slag after treatment
When the concentration is 0.1% or more and 1% or less, the fluidity of the reduced slag can be ensured even when the Fe 2 O 3 concentration in the treated slag is as low as 1% or more and less than 3%. . If the B 2 O 3 concentration in the slag is less than 0.1%, the fluidity may decrease if the Fe 2 O 3 concentration in the slag is not 3% or more, and the B 2 O 3 concentration in the slag is 1%. %, The effect of securing fluidity is saturated, which may result in excessive addition, which is not economical. The preferred range is 0.3-0.8
%. As the B 2 O 3 material, a B 2 O 3 content concentration of about 3
A substance containing 0% boron oxide can be used.
【００２２】処理後のスラグ中のＰ2 Ｏ5 濃度が０．２
％以上１．５％以下であれば処理後のスラグ中のＦｅ2
Ｏ3 濃度が０．５％以上３％未満の低濃度であっても還
元スラグの流動性を確保することができる。スラグ中の
Ｐ2 Ｏ5 濃度が０．２％未満では、スラグ中のＦｅ2 Ｏ
3 濃度が３％以上でないと流動性が低下するおそれがあ
り、スラグ中のＰ2 Ｏ5 濃度が１．５％を超えると流動
性を確保する効果が飽和し過剰添加となるおそれがあり
経済的ではない。好ましい範囲は、０．５〜１．２％で
ある。Ｐ2 Ｏ5 材としては、Ｐ鉱石、溶銑脱りんスラグ
等が使用できる。The slag after treatment has a P 2 O 5 concentration of 0.2
% Or more and 1.5% or less, the Fe 2 content in the treated slag
Even if the O 3 concentration is as low as 0.5% or more and less than 3%, the fluidity of the reduced slag can be ensured. If the P 2 O 5 concentration in the slag is less than 0.2%, the Fe 2 O
3 If the concentration is not 3% or more, the fluidity may decrease, and if the P 2 O 5 concentration in the slag exceeds 1.5%, the effect of securing the fluidity may be saturated and excessive addition may result. Not a target. A preferred range is 0.5-1.2%. As the P 2 O 5 material, P ore, hot metal dephosphorization slag, or the like can be used.
【００２３】処理後のスラグ中のＡｌ2 Ｏ3 濃度が２％
以上１５％以下であれば処理後のスラグ中のＦｅ2 Ｏ3
濃度が１％以上３％未満の低濃度であっても還元スラグ
の流動性を確保することができる。スラグ中のＡｌ2 Ｏ
3 濃度が２％未満では、スラグ中のＦｅ2 Ｏ3 濃度が３
％以上でないと流動性が低下するおそれがあり、スラグ
中のＡｌ2 Ｏ3 濃度が１５％を超えると流動性を確保す
る効果が飽和し過剰添加となるおそれがあり経済的では
ない。好ましい範囲は、５〜１２％である。Ａｌ2 Ｏ3
材としては、アルミナ、天然ボーキサイト、造塊スラグ
等が使用できる。Al 2 O 3 concentration in slag after treatment is 2%
If it is not less than 15%, Fe 2 O 3 in the slag after the treatment
Even if the concentration is as low as 1% or more and less than 3%, the fluidity of the reduced slag can be ensured. Al 2 O in slag
3 The concentration is less than 2%, Fe 2 O 3 concentration of 3 in the slag
%, The fluidity may be reduced. If the Al 2 O 3 concentration in the slag exceeds 15%, the effect of securing the fluidity may be saturated, resulting in excessive addition, which is not economical. A preferred range is 5-12%. Al 2 O 3
As the material, alumina, natural bauxite, ingot slag and the like can be used.
【００２４】[0024]
【実施例】アルゴン−酸素脱炭炉で生成した還元スラグ
からメタル分を除去したスラグ（ＦｅＯ＝０．６〜０．
７％、Ｃｒ2 Ｏ3 ＝０．６〜０．７％、ＭｎＯ＝０．３
〜０．４％、塩基度＝１．５〜２．０）の１５〜１６ｔ
を対象として処理を実施した。EXAMPLE A slag obtained by removing metal components from reduced slag generated in an argon-oxygen decarburization furnace (FeO = 0.6 to 0.1).
7%, Cr 2 O 3 = 0.6~0.7%, MnO = 0.3
~ 0.4%, basicity = 1.5 ~ 2.0) 15 ~ 16t
The processing was carried out for.
【００２５】表１に処理条件、処理後のスラグ組成およ
び固化率を示す。固化率は、粒径５mm以下のスラグを粉
化しているスラグとみなし、粒径５mmを超えるスラグの
重量を測定し、全スラグ重量に対しての重量割合を求め
たものである。即ち、固化率＝粒径５mmを超えるスラグ
の重量／全スラグ重量×１００（％）である。目標の固
化率を９５％以上とした。Table 1 shows the treatment conditions, the slag composition after treatment, and the solidification rate. The solidification rate is obtained by regarding the slag having a particle size of 5 mm or less as powdered slag, measuring the weight of the slag having a particle size of 5 mm or more, and calculating the weight ratio to the total slag weight. That is, solidification ratio = weight of slag exceeding 5 mm in particle size / total slag weight × 100 (%). The target solidification rate was set to 95% or more.
【００２６】[0026]
【表１】 [Table 1]
【００２７】ＦｅＯ材：ＦｅＯ含有濃度約９２％のミル
スケール、Ｆｅ材：Ｆｅ含有濃度約９９％の粒鉄（粒径
１０〜３０mm）、Ｂ2 Ｏ3 ：Ｂ2 Ｏ3 含有濃度約３０％
の酸化硼素含有物、Ｐ2 Ｏ5 材：Ｐ2 Ｏ5 含有濃度約
４．６％であり塩基度約２．３の溶銑脱Ｐスラグ、Ａｌ
2 Ｏ3 材：Ａｌ2 Ｏ3 含有濃度約９７％のアルミナをそ
れぞれホッパーから投入し、ランスから酸素純度約９
９．９％の上吹き用工業酸素をスラグに１．７〜３．６
Nm3/分の流量で３０分間吹き込んで、処理後のスラグ中
のＦｅ2 Ｏ3 を全て３％未満にした。FeO material: mill scale with FeO content of about 92%, Fe material: granular iron (particle diameter: 10 to 30 mm) with Fe content of about 99%, B 2 O 3 : B 2 O 3 content of about 30%
Boron oxide inclusions, P 2 O 5 material: P 2 O 5 content concentration of about 4.6% basicity of about 2.3 hot metal de P slag, Al
2 O 3 material: Alumina having an Al 2 O 3 content of about 97% is charged from a hopper, and an oxygen purity of about 9 is supplied from a lance.
9.9% of top-blown industrial oxygen for slag 1.7 to 3.6
Blowing was performed at a flow rate of Nm 3 / min for 30 minutes to reduce all Fe 2 O 3 in the treated slag to less than 3%.
【００２８】表１に示すように、処理後のＢ2 Ｏ3 、Ｐ
2 Ｏ5 、およびＡｌ2 Ｏ3 含有濃度が適正範囲の試験Ｎ
ｏ．１〜４および６〜７は処理後のスラグ中のＦｅ2 Ｏ
3 を１％以上３％未満に抑えることができ、固化率も目
標の９５％以上にすることができた。As shown in Table 1, B 2 O 3 , P
Test N in which the concentration of 2 O 5 and Al 2 O 3 is in the proper range
o. 1-4 and 6-7 are Fe 2 O in the slag after treatment.
3 could be suppressed to 1% or more and less than 3%, and the solidification rate could be increased to the target of 95% or more.
【００２９】Ａｌ2 Ｏ3 含有濃度が適正範囲外の比較例
の試験Ｎｏ．５では、７０％の固化率しか得られなかっ
た。In the test No. of the comparative example in which the concentration of Al 2 O 3 was out of the proper range. In No. 5, only a solidification rate of 70% was obtained.
【００３０】[0030]
【発明の効果】本発明によれば、金属精錬炉から発生す
る還元スラグの粉化の防止を処理後のスラグ中のＦｅ2
Ｏ3 濃度が１％以上３％未満の低濃度であっても行うこ
とができる。According to the present invention, it is possible to prevent the reduction slag generated from the metal smelting furnace from powdering by reducing the amount of Fe 2 in the slag after the treatment.
It can be carried out even when the O 3 concentration is as low as 1% or more and less than 3%.
【図１】本発明で使用するスラグ処理設備の模式的な概
念図である。FIG. 1 is a schematic conceptual diagram of a slag treatment facility used in the present invention.
１：スラグ容器、 ２：ホッパー、 ３：ランス、 ４：還元スラグ 1: slag container, 2: hopper, 3: lance, 4: reduced slag
フロントページの続き Ｆターム(参考） 4G012 JL03 JM04 4K002 AB04 AE01 AE06 4K013 CA04 CF01 EA01 EA02 EA18 FA05 4K063 AA03 BA02 HA00 HA17 Continued on the front page F term (reference) 4G012 JL03 JM04 4K002 AB04 AE01 AE06 4K013 CA04 CF01 EA01 EA02 EA18 FA05 4K063 AA03 BA02 HA00 HA17
Claims (3)
タル分を分離した溶融スラグを収容した容器内に発熱剤
としてＦｅＯまたは／およびＦｅを、添加剤としてＢ2
Ｏ3 を添加するとともに、酸素を含有するガスを該スラ
グに吹き込み、処理後のスラグ中のＦｅ2 Ｏ3 濃度を重
量％で１％以上３％未満、スラグ中のＢ2 Ｏ3 濃度を重
量％で０．１％以上１％以下とすることを特徴とする還
元スラグの粉化を防止する方法。1. A container containing a molten slag from which a metal component in a reduced slag generated in a metal refining furnace is separated, FeO and / or Fe as a heating agent, and B 2 as an additive.
While adding O 3 , a gas containing oxygen is blown into the slag, and the Fe 2 O 3 concentration in the slag after treatment is 1% or more and less than 3% by weight, and the B 2 O 3 concentration in the slag is A method for preventing powdered reduced slag from 0.1% to 1%.
タル分を分離した溶融スラグを収容した容器内に発熱剤
としてＦｅＯまたは／およびＦｅを、添加剤としてＰ2
Ｏ5 を添加するとともに、酸素を含有するガスを該スラ
グに吹き込み、処理後のスラグ中のＦｅ2 Ｏ3 濃度を重
量％で１％以上３％未満、スラグ中のＰ2 Ｏ5 濃度を重
量％で０．２％以上１．５％以下とすることを特徴とす
る還元スラグの粉化を防止する方法。2. A container containing a molten slag from which a metal component in a reduced slag generated in a metal refining furnace is separated, FeO or / and Fe as a heating agent, and P 2 as an additive.
While adding O 5 , a gas containing oxygen is blown into the slag, and the Fe 2 O 3 concentration in the treated slag is 1% or more and less than 3% by weight, and the P 2 O 5 concentration in the slag is A method for preventing pulverization of reduced slag, wherein the slag is 0.2% or more and 1.5% or less.
タル分を分離した溶融スラグを収容した容器内に発熱剤
としてＦｅＯまたは／およびＦｅを、添加剤としてＡｌ
2 Ｏ3 を添加するとともに、酸素を含有するガスを該ス
ラグに吹き込み、処理後のスラグ中のＦｅ2 Ｏ3 濃度を
重量％で１％以上３％未満、スラグ中のＡｌ2 Ｏ3 濃度
を重量％で２％以上１５％以下とすることを特徴とする
還元スラグの粉化を防止する方法。3. A container containing a molten slag from which a metal component in a reduced slag generated in a metal refining furnace is separated, wherein FeO and / or Fe is added as a heating agent and Al is added as an additive.
While adding 2 O 3 , an oxygen-containing gas was blown into the slag, and the Fe 2 O 3 concentration in the treated slag was 1% or more and less than 3% by weight, and the Al 2 O 3 concentration in the slag was reduced. A method for preventing powdered reduced slag from 2% to 15% by weight.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21762198A JP4134389B2 (en) | 1998-07-31 | 1998-07-31 | Method for preventing powdered reduced slag |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21762198A JP4134389B2 (en) | 1998-07-31 | 1998-07-31 | Method for preventing powdered reduced slag |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000044298A true JP2000044298A (en) | 2000-02-15 |
| JP4134389B2 JP4134389B2 (en) | 2008-08-20 |
Family
ID=16707171
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21762198A Expired - Fee Related JP4134389B2 (en) | 1998-07-31 | 1998-07-31 | Method for preventing powdered reduced slag |
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| Country | Link |
|---|---|
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006007316A (en) * | 2004-06-23 | 2006-01-12 | Stollberg & Samil Co Ltd | Mold flux containing no fluorine component for continuous steel casting |
| JP2006137655A (en) * | 2004-11-15 | 2006-06-01 | Sanyo Special Steel Co Ltd | Steelmaking slag adjusted as asphalt aggregate and concrete aggregate with excellent wear resistance |
| JP2006137656A (en) * | 2004-11-15 | 2006-06-01 | Sanyo Special Steel Co Ltd | Steelmaking slag aggregate with excellent wear resistance |
| JP2013234099A (en) * | 2012-05-10 | 2013-11-21 | Jfe Steel Corp | Method for cooling stainless steel slag |
| CN115786739A (en) * | 2022-11-23 | 2023-03-14 | 北京科技大学 | A method for improving the alloying rate of chrome ore |
-
1998
- 1998-07-31 JP JP21762198A patent/JP4134389B2/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006007316A (en) * | 2004-06-23 | 2006-01-12 | Stollberg & Samil Co Ltd | Mold flux containing no fluorine component for continuous steel casting |
| JP2006137655A (en) * | 2004-11-15 | 2006-06-01 | Sanyo Special Steel Co Ltd | Steelmaking slag adjusted as asphalt aggregate and concrete aggregate with excellent wear resistance |
| JP2006137656A (en) * | 2004-11-15 | 2006-06-01 | Sanyo Special Steel Co Ltd | Steelmaking slag aggregate with excellent wear resistance |
| JP2013234099A (en) * | 2012-05-10 | 2013-11-21 | Jfe Steel Corp | Method for cooling stainless steel slag |
| CN115786739A (en) * | 2022-11-23 | 2023-03-14 | 北京科技大学 | A method for improving the alloying rate of chrome ore |
| CN115786739B (en) * | 2022-11-23 | 2024-01-23 | 北京科技大学 | A method to improve the alloying rate of chromium ore |
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| Publication number | Publication date |
|---|---|
| JP4134389B2 (en) | 2008-08-20 |
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