JP2002294320A - Method for producing molten iron pretreating agent utilizing iron oxide-containing collected dust - Google Patents
Method for producing molten iron pretreating agent utilizing iron oxide-containing collected dustInfo
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- JP2002294320A JP2002294320A JP2001102862A JP2001102862A JP2002294320A JP 2002294320 A JP2002294320 A JP 2002294320A JP 2001102862 A JP2001102862 A JP 2001102862A JP 2001102862 A JP2001102862 A JP 2001102862A JP 2002294320 A JP2002294320 A JP 2002294320A
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- Prior art keywords
- dust
- hot metal
- iron oxide
- mass
- pretreatment agent
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- 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.)
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- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、製鉄関連設備から
排出される酸化鉄含有集塵ダストを利用した溶銑予備処
理剤の製造方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a hot metal pretreatment agent using iron oxide-containing dust collected from steelmaking equipment.
【０００２】[0002]
【従来の技術】一般に、溶銑予備処理では、高炉鋳床に
設置された出銑樋内の溶銑に酸化鉄を主体とする脱珪剤
を散布し、その流下する過程で脱珪を図る特開昭58-567
23号公報に開示されている散布方式と、出銑樋端に近接
して設けられた傾注樋内の溶銑に対して酸化鉄を主とす
る脱珪剤を投射添加する特開昭59-143010 号公報等に開
示されている投射方式が知られている。また、取鍋やト
ピードカー等の溶銑容器内に収容された溶銑中に酸化
鉄、生石灰、炭酸カルシウム等を混合した脱珪脱燐剤を
空気、窒素等の搬送気体によって輸送管路内を浮遊状態
で輸送し、浸漬ランスの先端から吹き込むインジェクシ
ョン方式が知られている。2. Description of the Related Art In general, in hot metal pretreatment, a desiliconizing agent mainly composed of iron oxide is sprayed on hot metal in a tapping gutter installed in a blast furnace casting bed, and desiliconization is performed in the process of flowing down the molten iron. Showa 58-567
Japanese Unexamined Patent Publication No. 59-143010 discloses a spraying method disclosed in JP-A-59-143010, in which a desiliconizing agent mainly containing iron oxide is added to hot metal in a slanting gutter provided near an end of a tapping gutter. A projection system disclosed in a gazette or the like is known. In addition, a desiliconization dephosphorizer mixed with iron oxide, quicklime, calcium carbonate, etc. in hot metal stored in a hot metal container such as a ladle or a topped car is suspended in the transport pipeline by a carrier gas such as air or nitrogen. There is known an injection method in which the lance is transported and blown from the tip of an immersion lance.
【０００３】従来の散布方式、投射方式およびインジェ
クション方式による溶銑予備処理には、粒径１mm以下の
脱珪剤、脱珪脱燐剤が一般的に用いられている。これら
予備処理剤は粉砕処理によって粒度が調整されているた
め、粒度分布として100 μm以下の比率が少なくなって
いる。従来の溶銑予備処理剤は粒径が比較的大きいため
溶銑予備処理を実施する際、溶銑との反応速度が遅いの
で溶銑容器内のスラグ中に未反応の酸化鉄が増加して反
応効率が低下すると共にスラグフォーミングが著しくな
る。[0003] In the conventional hot metal pretreatment by a spraying method, a projection method and an injection method, a desiliconizing agent and a desiliconizing dephosphorizing agent having a particle diameter of 1 mm or less are generally used. Since the particle size of these pretreatment agents is adjusted by pulverization, the ratio of particle size distribution of 100 μm or less is reduced. The conventional hot metal pretreatment agent has a relatively large particle size, so when performing hot metal pretreatment, the reaction rate with hot metal is slow, so unreacted iron oxide increases in the slag in the hot metal container and the reaction efficiency decreases. And slag forming becomes remarkable.
【０００４】フォーミング防止剤を添加しても溶銑容器
への溶銑充填量低下が避けられなかった。溶銑を脱珪、
脱燐処理するための酸化鉄源として、焼結鉱粉や破砕ミ
ルスケールが使用されているが、これらの粉粒体は貯蔵
ホッパからディスペンサを経由して気体輸送配管内を高
速高圧で搬送される。これら粉粒体は硬いため高速高圧
で搬送する際に、気体輸送配管が著しく磨耗する。[0004] Even if a forming inhibitor is added, a decrease in the filling amount of hot metal into a hot metal container cannot be avoided. Desiliconizing hot metal,
Sintered ore and crushed mill scale are used as iron oxide sources for dephosphorization, and these powders are transported from a storage hopper through a dispenser through a gas transport pipe at high speed and high pressure. You. Since these powders are hard, when transported at high speed and high pressure, the gas transport pipes are significantly worn.
【０００５】管体の磨耗を低減するため微粉鉄鉱石で薄
めて機械的衝撃を緩和することが知られている。例え
ば、特公平4-38809 号公報には、製鉄関連設備から排出
される酸化鉄含有集塵ダストを、下記粉体特性を満たす
という条件の下で、粉粒状のスケールおよび／または鉄
鉱石と混合したものであることを特徴とする溶銑予備処
理剤が開示されている。粒度構成：150 μm 以下で、か
つ105 μm 以下のものが全体の80〜90重量％を占める流
動性指数:35 〜40、噴流性指数:79 〜90。[0005] It is known to reduce the mechanical impact by diluting with fine iron ore to reduce the wear of the tube. For example, Japanese Patent Publication No. 4-38809 discloses that iron oxide-containing dust collected from iron-related equipment is mixed with a granular scale and / or iron ore under the condition that the following powder characteristics are satisfied. Disclosed is a hot metal pretreatment agent characterized by the following. Particle size composition: those having a particle size of 150 μm or less and 105 μm or less occupy 80 to 90% by weight of the whole; fluidity index: 35 to 40;
【０００６】[0006]
【発明が解決しようとする課題】しかるに、前記特公平
4-38809 号公報に開示されている従来技術は、酸化鉄含
有集塵ダストの粒度構成が：150 μm 以下で、かつ105
μm 以下のものが全体の80〜90重量％を占めることを要
件の一つとしており、微粉ダストと粒度の大きい他のダ
ストとの混合組み合わせに大きな制限があり、製鉄関連
設備から排出される酸化鉄含有集塵ダストの全てに適用
できるものとなっていない。すなわち、酸化鉄含有集塵
ダストには、電気炉から発生するダストのように粒径分
布で50μm以下が50質量％以上を占めるものがあるが、
前記公報の従来技術はこのような超微粉ダストに適用す
ることができない。SUMMARY OF THE INVENTION
The prior art disclosed in Japanese Patent Publication No. 4-38809 discloses that the particle size composition of dust collection dust containing iron oxide is:
One of the requirements is that particles of less than μm occupy 80 to 90% by weight of the total, and there is a large restriction on the combination of fine dust and other dust with a large particle size. Not applicable to all iron-containing dust collection dust. In other words, among iron oxide-containing dust-collected dusts, there are particles such as dusts generated from electric furnaces whose particle size distribution is 50 μm or less occupying 50% by mass or more,
The prior art of the above publication cannot be applied to such ultrafine dust.
【０００７】本発明は、酸化鉄含有集塵ダストのうち粒
径分布で50μm 以下が50質量％以上を占める凝集性の大
きな超微粉ダストを、ホッパ内に堆積した状態から棚吊
りを生じることなく安定して切り出すことを可能にした
溶銑予備処理剤の製造方法を提供することを目的とす
る。According to the present invention, highly cohesive ultrafine dust particles having a particle size distribution of not more than 50 μm in the dust collection containing iron oxide and occupying 50% by mass or more of the dust particles are not hung from the shed in the hopper. An object of the present invention is to provide a method for producing a hot metal pretreatment agent that enables stable cutting.
【０００８】[0008]
【課題を解決するための手段】前記目的を達成するため
の請求項１記載の本発明は、製鉄関連設備から排出され
る酸化鉄含有集塵ダストを、溶銑脱珪、脱燐処理する酸
化剤として利用する溶銑予備処理剤の製造に際し、前記
酸化鉄含有集塵ダストが粒径分布で50μm 以下の割合が
50質量％以上かつ凝集度が70を超える高い凝集性を有す
る超微粉集塵ダストであり、該超微粉集塵ダストを貯蔵
ホッパに受け入れる前の段階で前記溶銑予備処理剤の５
〜50質量％の割合として、残部の酸化鉄および脱珪脱燐
助剤を包含する粒径分布で50μm 超〜1000μm の割合が
50質量％以上かつ凝集度が70以下の低い凝集性を有する
粉粒体と混合させてなることを特徴とする酸化鉄含有集
塵ダストを利用した溶銑予備処理剤の製造方法である。According to a first aspect of the present invention, there is provided an oxidizing agent for performing a hot metal desiliconization and dephosphorization treatment of iron oxide-containing dust collected from an iron making facility. In the production of the hot metal pretreatment agent used as the iron oxide-containing dust-collecting dust, the particle size distribution is less than 50 μm in proportion.
Ultra-fine dust collecting dust having a high cohesiveness of 50% by mass or more and a cohesion degree of more than 70, and before the ultra-fine dust collecting dust is received in a storage hopper, the hot metal pretreatment agent 5
The ratio of more than 50 μm to 1000 μm in the particle size distribution including the remaining iron oxide and the desiliconization / dephosphorization aid
A method for producing a hot metal pretreatment agent using iron oxide-containing dust-collected dust, which is mixed with a powder having a low cohesiveness of 50% by mass or more and a cohesion degree of 70 or less.
【０００９】請求項２記載の本発明は、前記超微粉集塵
ダストを前記溶銑予備処理剤の10〜30質量％の割合とす
ることを特徴とする請求項１記載の酸化鉄含有集塵ダス
トを利用した溶銑予備処理剤の製造方法である。請求項
３記載の本発明は、製鉄関連設備から排出される酸化鉄
含有集塵ダストを、溶銑脱珪、脱燐処理する酸化剤とし
て利用する溶銑予備処理剤の使用に際し、前記酸化鉄含
有集塵ダストが粒径分布で50μm 以下の割合が50質量％
以上かつ凝集度が70を超える高い凝集性を有する超微粉
集塵ダストであり、該超微粉集塵ダストを前記溶銑予備
処理剤の５〜50質量％の割合として、残部の酸化鉄およ
び脱珪脱燐助剤を包含する粒径分布で50μm 超〜1000μ
m の割合が50質量％以上かつ凝集度が70以下の低い凝集
性を有する粉粒体と混合させた前記溶銑予備処理剤を、
ホッパあるいはディスペンサから排出する気送過程で超
微粉集塵ダストを分散させることを特徴とする酸化鉄含
有集塵ダストを利用した溶銑予備処理剤の使用方法であ
る。According to a second aspect of the present invention, there is provided the iron oxide-containing dust-collecting dust according to the first aspect, wherein the ultra-fine dust dust is contained in a ratio of 10 to 30% by mass of the hot metal pretreatment agent. This is a method for producing a hot metal pretreatment agent using the method. The present invention according to claim 3 is characterized in that, when the hot metal pretreatment agent is used to utilize the iron oxide-containing dust collected from the iron-making equipment as an oxidizing agent for hot metal desiliconization and dephosphorization, the iron oxide-containing dust is collected. 50% by mass of dust particles with a particle size distribution of 50μm or less
An ultra-fine dust collecting dust having a high cohesiveness having a cohesion degree of more than 70, wherein the ultra-fine dust collecting dust has a ratio of 5 to 50% by mass of the hot metal pretreatment agent, and the remaining iron oxide and desiliconized More than 50μm to 1000μ in particle size distribution including dephosphorization aid
The hot metal pretreatment agent mixed with a powder having a low cohesiveness in which the proportion of m is 50% by mass or more and the cohesion degree is 70 or less,
This is a method for using a hot metal pretreatment agent utilizing iron oxide-containing dust-collected dust, which is characterized by dispersing ultrafine dust-collected dust in a pneumatic process discharged from a hopper or a dispenser.
【００１０】[0010]
【発明の実施の形態】本発明らは、酸化鉄含有集塵ダス
トのうち粒径分布で50μm 以下が50質量％以上を占める
超微粉の電気炉ダストを脱珪、脱燐処理するための溶銑
予備処理剤として利用することに着目し種々検討を重ね
た。溶銑処理センタでトピードカー内の溶銑に超微粉の
電気炉ダスト単体を吹き込む実験を試みたが、その際に
は、電気炉ダストが超微粉のため搬送時に輸送用タンク
ローリに60％が残留し、またホッパ内で電気炉ダストの
棚吊りを起こし、吹き込み用ランスから電気炉ダストを
安定して吹き込むことができなかった。BEST MODE FOR CARRYING OUT THE INVENTION The present invention relates to a hot metal for desiliconization and dephosphorization of ultra-fine electric furnace dust having a particle size distribution of 50% by mass or more in the dust collection dust containing iron oxide. Various investigations were repeated, paying attention to use as a pretreatment agent. At the hot metal processing center, an experiment was conducted in which ultra-fine electric furnace dust alone was blown into the hot metal in a topied car. The electric furnace dust was suspended from the shelf in the hopper, and the electric furnace dust could not be stably blown from the blowing lance.
【００１１】そこで、超微粉の電気炉ダストに、50μm
超が50質量％以上の粒径分布を有する比較的粗粒の焼結
ダスト並びに石灰粉（CaO ）とを混合してトピードカー
内の溶銑に吹き込む実験を行った。表１に、焼結機から
発生する焼結ダストおよび電気炉から発生する電気炉ダ
ストの粒度分布およびその他の性状を示す。表１に示す
ように、焼結ダストは50μm 以下が１質量％の粒度分布
で凝集度が70であるのに比較して、電気炉ダストは50μ
m 以下が70質量％の粒度分布であり超微粉であるために
凝集度が79と高い値を示している。[0011] Therefore, 50 μm
An experiment was conducted in which relatively coarse sintered dust having a particle size distribution of more than 50% by mass and lime powder (CaO 2) were mixed and blown into hot metal in a topped car. Table 1 shows the particle size distribution and other properties of the sinter dust generated from the sintering machine and the electric furnace dust generated from the electric furnace. As shown in Table 1, the electric furnace dust was 50 μm in comparison with the sintered dust having a particle size distribution of 1 mass% and a cohesion degree of 70 when the particle size was 50 μm or less.
m and below have a particle size distribution of 70% by mass and are ultrafine powders, so that the degree of aggregation is as high as 79.
【００１２】なお、凝集度とは、振幅１mm、振動時間
（sec ）＝20＋(1.6−W)/0.06 の条件で振動させた粉体
を、60、100 、200 メッシュの３段階で篩分けし、（60
メッシュオーバ）＋（100 メッシュオーバ）×0.6 ＋
（200 メッシュオーバ）×0.2 の式で算出される粉体重
量比率で表したものである。ここで、Ｗ＝(P−A)×C/10
0 ＋A (g/cm3) であり、Ｃ：圧縮度（＝ 100×(P-A)
）、Ｐ：緩み見掛け比重、Ａ：固め見掛け比重であ
る。The degree of agglomeration means that the powder vibrated under the conditions of an amplitude of 1 mm and a vibration time (sec) of 20+ (1.6−W) /0.06 is sieved in three stages of 60, 100 and 200 mesh. , (60
Mesh over) + (100 mesh over) x 0.6 +
(200 mesh over) × 0.2 expressed by the powder weight ratio calculated by the formula. Here, W = (P−A) × C / 10
0 + A (g / cm 3 ), C: degree of compression (= 100 × (PA))
), P: loose apparent specific gravity, A: solid apparent specific gravity.
【００１３】[0013]
【表１】 [Table 1]
【００１４】図２に焼結ダストと電気炉ダストとを混合
した溶銑予備処理剤における電気炉ダストの混合比率
（質量％）と安息角との関係を、また図３に石灰粉と電
気炉ダストとを混合した溶銑予備処理剤における電気炉
ダストの混合比率（質量％）と安息角との関係を示す。
図２から凝集度が70を超える電気炉ダストと凝集度が70
以下である焼結ダストと混合する場合、電気炉ダストの
混合比率が40質量％まではホッパ内に棚吊りを起こすこ
となく浸漬ランスからトピードカー内の溶銑中に吹き込
み可能であるが、40質量％を超えると安息角が55度を超
えるためホッパ内に棚吊りが発生し、吹き込み不可能と
なる。FIG. 2 shows the relationship between the mixing ratio (mass%) of electric furnace dust and the angle of repose in the hot metal pretreatment agent obtained by mixing sintered dust and electric furnace dust, and FIG. 3 shows lime powder and electric furnace dust. 4 shows the relationship between the mixing ratio (mass%) of electric furnace dust and the angle of repose in the hot metal pretreatment agent mixed with
From Fig.2, electric furnace dust with cohesion of more than 70 and cohesion of 70
When mixed with the following sintered dust, up to a mixing ratio of electric furnace dust of up to 40% by mass can be blown into the hot metal in the topped car from the immersion lance without hanging the shelf in the hopper, but 40% by mass If it exceeds, the angle of repose exceeds 55 degrees, so that shelves are suspended in the hopper, making it impossible to blow air.
【００１５】また、図３から凝集度が70以下の石灰粉と
混合する場合、電気炉ダストの混合比率が50質量％まで
はホッパ内に棚吊りを起こすことなく吹き込み可能であ
る。50質量％を超えると安息角が55度を超えるためホッ
パ内に棚吊りが発生し、吹き込み不可能となる。このよ
うに原料の種類により若干の差はあるが電気炉ダストが
50質量％を超えると間違いなくホッパ内に棚吊りが発生
して切り出し困難となりトピードカーへの吹き込みがで
きなくなることが分かった。さらに電気炉ダストのホッ
パ内での棚吊り防止には、これと混合する焼結ダスト、
石灰粉の粒径分布を50μm 超〜1000μm の割合が50質量
％以上とする必要のあることが分かった。In addition, as shown in FIG. 3, when mixing with lime powder having a cohesion degree of 70 or less, it is possible to blow the electric furnace dust into the hopper without hanging the shelves up to 50% by mass. If it exceeds 50% by mass, the angle of repose exceeds 55 degrees, so that shelves will be suspended in the hopper, making it impossible to blow air. Although there is a slight difference depending on the type of raw material, electric furnace dust
If it exceeds 50% by mass, it is evident that shelves are hung in the hopper, making it difficult to cut out and making it impossible to blow into the torpedo car. Furthermore, in order to prevent electric furnace dust from hanging on the shelf in the hopper, sintered dust mixed with this,
It has been found that the particle size distribution of the lime powder needs to be more than 50% by mass at a ratio of more than 50 μm to 1000 μm.
【００１６】図２および図３から焼結ダストや石灰粉に
混合可能な凝集度が70を超える電気炉ダストの混合比率
は、安息角を55度以下のレベルに確保できる50質量％が
上限となる。一方、電気炉ダストの混合比率の下限は、
利用量を勘案して５質量％とする。電気炉ダストの利用
量並びに吹き込みの安定性を考慮すると電気炉ダストの
混合比率は、10〜30質量％の範囲が好適となる。2 and 3, the upper limit of the mixing ratio of electric furnace dust having a cohesion degree of more than 70 which can be mixed with sintered dust or lime powder is 50% by mass at which the angle of repose can be maintained at a level of 55 ° or less. Become. On the other hand, the lower limit of the mixing ratio of electric furnace dust is
Considering the usage amount, it is 5% by mass. Considering the usage amount of electric furnace dust and the stability of blowing, the mixing ratio of electric furnace dust is preferably in the range of 10 to 30% by mass.
【００１７】以下、本発明の実施の形態を図面に基づい
て説明する。図１に示すように、鉄スクラップの溶解、
精錬を行う電気炉１から発生する排ガスは、CO、H2等の
可燃性ガスを含有しているので、これを燃焼塔２に導い
て燃焼させ、1000〜1200℃の燃焼ガスとする。その燃焼
ガスでスクラップ原料を予熱すると共に空気予熱器（図
示せず）へ供給して燃焼用空気を予熱し、これを燃焼塔
２に供給することにより熱回収している。このようにし
て低温とした排ガスは、集塵機３に導かれ排ガス中のダ
ストが集塵される。Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1, melting of scrap iron,
Exhaust gas generated from the electric furnace 1 for refining, CO, because it contains a combustible gas such as H 2, which is combusted guided to the combustion tower 2, the combustion gases of 1000 to 1200 ° C.. The combustion gas preheats the scrap raw material and supplies it to an air preheater (not shown) to preheat combustion air, and supplies it to the combustion tower 2 to recover heat. The low temperature exhaust gas is guided to the dust collector 3 and dust in the exhaust gas is collected.
【００１８】集塵機３内に溜まった電気炉ダストは、専
用コンテナ４に収納してトラックにより搬送されてミキ
サー５に供給されると共に、焼結ダストホッパ６からミ
キサー５に切り出された焼結ダストと混合して溶銑予備
処理剤とする。電気炉ダストおよび焼結ダストの粒度分
布およびその他の性状は、表１に示した通りである。電
気炉ダストは、粒径分布で50μm 以下の割合が50質量％
以上の超微粉で、かつ凝集度が70を超える高い凝集性を
有するので、凝集度が70以下で凝集性が低い焼結ダスト
と混合して電気炉ダストの混合比率を５〜50質量％、好
ましくは10〜30質量％の割合とする。例えば、溶銑予備
処理剤中の電気炉ダストの混合比率を20質量％、焼結ダ
ストの混合比率を80質量％とする。The electric furnace dust collected in the dust collector 3 is stored in a dedicated container 4, transported by a truck and supplied to the mixer 5, and mixed with the sintered dust cut out from the sintered dust hopper 6 by the mixer 5. To make a hot metal pretreatment agent. The particle size distribution and other properties of the electric furnace dust and the sintered dust are as shown in Table 1. 50% by mass of electric furnace dust is 50% or less in particle size distribution.
The above ultra-fine powder, and the cohesion degree has a high cohesion of more than 70, so that the cohesion degree is 70 or less, mixed with low cohesion sintering dust, the mixing ratio of the electric furnace dust is 5 to 50 mass%, Preferably, the ratio is 10 to 30% by mass. For example, the mixing ratio of electric furnace dust in the hot metal pretreatment agent is 20% by mass, and the mixing ratio of sintered dust is 80% by mass.
【００１９】ミキサー５により混合された溶銑予備処理
剤は、タンクローリ７により搬送され、貯蔵ホッパ８に
貯蔵される。貯蔵ホッパ８に貯蔵された溶銑予備処理剤
は電気炉ダストの混合比率が20質量％であるため、貯蔵
ホッパ８内に溶銑予備処理剤が堆積した状態から排出口
へ棚吊りを生じることなくスムーズな流れを形成しつつ
開状態の開閉弁９を通過し、下方に配置されたディスペ
ンサ10に安定して供給される。The hot metal pretreatment agent mixed by the mixer 5 is transported by the tank lorry 7 and stored in the storage hopper 8. The molten iron pretreatment agent stored in the storage hopper 8 has a mixing ratio of electric furnace dust of 20% by mass, so that the state in which the molten iron pretreatment agent is accumulated in the storage hopper 8 does not cause a shelf to be suspended from the outlet to the outlet. The fluid passes through the open / close valve 9 while forming a stable flow, and is supplied stably to the dispenser 10 arranged below.
【００２０】ディスペンサ10は加圧気体供給ライン（図
示省略）により空気等の気体で所定の圧力に加圧された
後に開閉弁11を開き、ディスペンサ10内の溶銑予備処理
剤が、堆積した状態から排出口へ棚吊りを生じることな
くスムーズな流れを形成しつつロータリフィーダ17によ
る切り出し量の制御により所定速度で輸送管路12に供給
される。After the dispenser 10 is pressurized to a predetermined pressure by a gas such as air by a pressurized gas supply line (not shown), the on-off valve 11 is opened, and the hot metal pretreatment agent in the dispenser 10 is removed from the deposited state. The flow is supplied to the transport pipeline 12 at a predetermined speed by controlling the cut-out amount by the rotary feeder 17 while forming a smooth flow without causing hanging at the discharge port.
【００２１】輸送管路12には、溶銑予備処理剤を輸送す
るのに必要な空気等の搬送気体13が供給されており、し
たがって、溶銑予備処理剤は浮遊状態で輸送管路13内を
流れ、トピードカー14内に挿入した浸漬ランス15から溶
銑16中に吹き込まれて溶銑16の脱珪、脱燐処理が行われ
る。このとき、ディスペンサ10内の溶銑予備処理剤は、
気体圧力により浮遊状態で排出口から切り出され、引き
続き浮遊状態で輸送管路13内を流れる間に電気炉ダスト
の分散が促進される。このため微粉同士の凝集が抑制さ
れ、各部への付着による閉塞等のトラブルが防止できる
のである。A carrier gas 13 such as air necessary for transporting the hot metal pretreatment agent is supplied to the transport line 12, so that the hot metal pretreatment agent flows through the transport line 13 in a floating state. Then, the hot metal 16 is blown into the hot metal 16 from the immersion lance 15 inserted in the torpedo car 14 to perform the desiliconization and dephosphorization of the hot metal 16. At this time, the hot metal pretreatment agent in the dispenser 10 is
Dispersion of the electric furnace dust is promoted while the gas is cut out from the discharge port in a floating state by the gas pressure and subsequently flows through the transport pipe 13 in a floating state. For this reason, aggregation of fine powders is suppressed, and troubles such as blockage due to adhesion to various parts can be prevented.
【００２２】溶銑予備処理剤中の電気炉ダストの混合比
率を20質量％、焼結ダストの混合比率を80質量％とした
本発明例（貯蔵ホッパ８→ディスペンサ10→輸送管路12
→浸漬ランス15→トピードカー14という一連の吹込工
程）における吹込時間（min )と粉体吹込速度（kg/mi
n）との関係を図４に示した。図４から明らかなよう
に、本発明によれば溶銑予備処理剤の吹込開始から約30
分の吹込終了まで550kg/min程度の粉体吹込速度で安定
した状態で吹き込みを実施することができる。Example of the present invention in which the mixing ratio of electric furnace dust in the hot metal pretreatment agent is 20% by mass and the mixing ratio of sintered dust is 80% by mass (storage hopper 8 → dispenser 10 → transport line 12)
→ Blowing time (min) and powder blowing speed (kg / mi) in a series of blowing process of immersion lance 15 → topeed car 14)
The relationship with n) is shown in FIG. As is apparent from FIG. 4, according to the present invention, about 30 minutes after the start of the injection of the hot metal pretreatment agent.
Blowing can be performed in a stable state at a powder blowing speed of about 550 kg / min until the blowing of the minute is completed.
【００２３】一方、図５に溶銑予備処理剤中の電気炉ダ
ストの混合比率を60質量％、焼結ダストの混合比率を40
質量％とする比較例における吹込時間（min ）と粉体吹
込速度（kg/min）との関係を示した。比較例の場合、電
気炉ダストの比率が高く、吹込時間５分経過頃からディ
スペンサ10内に棚吊りが生じたため急激に吹込速度が低
下し、約10分で吹き込みが不可能となった。On the other hand, FIG. 5 shows that the mixing ratio of the electric furnace dust in the hot metal pretreatment agent was 60% by mass and the mixing ratio of the sintered dust was 40%.
The relationship between the blowing time (min) and the powder blowing speed (kg / min) in the comparative example in which the mass% is used is shown. In the case of the comparative example, the ratio of the electric furnace dust was high, and the shelves were suspended in the dispenser 10 after about 5 minutes from the blowing time, so that the blowing speed was rapidly reduced, and the blowing became impossible in about 10 minutes.
【００２４】前記実施の形態では、焼結ダストと電気炉
ダストとを混合した溶銑予備処理剤の場合について説明
したが、本発明では電気炉ダスト以外の粒径分布で50μ
m 以下の割合が50質量％以上かつ凝集度が70を超える高
い凝集性を有する製鉄関連設備から排出される超微粉の
各種酸化鉄含有集塵ダストにも適用できる。超微粉ダス
トと混合する原料としては、粒径分布で50μm 超〜1000
μm の割合が50質量％以上かつ凝集度が70以下の低い凝
集性を有するものであれば一般的に使用されている酸化
鉄および脱珪脱燐助剤を包含する各種原料（石灰粉、溶
銑予備処理で発生した集塵ダスト、粉砕鉱石、粉砕ダス
ト、螢石粉等）が利用できるのはいうまでもない。In the above embodiment, the case of the hot metal pretreatment agent in which the sintering dust and the electric furnace dust are mixed has been described. However, in the present invention, the particle size distribution other than the electric furnace dust is 50 μm.
It can also be applied to various dust collection dusts containing ultra-fine powder discharged from iron-related equipment having a high cohesiveness in which the ratio of m or less is 50% by mass or more and the cohesion degree exceeds 70. As a raw material to be mixed with ultrafine dust, the particle size distribution is more than 50 μm to 1000
Various raw materials (iron powder, hot metal, etc.) including iron oxide and desiliconization and dephosphorization aids that are generally used as long as they have low cohesiveness with a μm ratio of 50% by mass or more and a cohesion degree of 70 or less Needless to say, dust collected in the preliminary treatment, crushed ore, crushed dust, fluorite powder, etc.) can be used.
【００２５】[0025]
【発明の効果】本発明によって製造された溶銑予備処理
剤は、ホッパ等の貯留槽や容器内での堆積状態から排出
口方向への流れが促され、棚吊りを生じることなくスム
ーズに切り出すことができ、このため凝集性の大きい超
微粉の酸化鉄含有集塵ダストを溶銑予備処理剤として有
効に利用できる。According to the present invention, the hot metal pretreatment agent produced according to the present invention is promoted to flow toward the discharge port from the state of accumulation in a storage tank or vessel such as a hopper, and can be cut out smoothly without hanging on a shelf. Therefore, the iron oxide-containing dust of ultra-fine powder having high cohesion can be effectively used as a hot metal pretreatment agent.
【図１】本発明での溶銑予備処理剤の調合、吹き込み例
を示すフロー図である。FIG. 1 is a flowchart showing an example of mixing and blowing a hot metal pretreatment agent in the present invention.
【図２】焼結ダストと電気炉ダストとを混合した溶銑予
備処理剤における電気炉ダスト混合比率と安息角との関
係を示すグラフである。FIG. 2 is a graph showing a relationship between an electric furnace dust mixing ratio and a repose angle in a hot metal pretreatment agent obtained by mixing sintered dust and electric furnace dust.
【図３】石灰粉と電気炉ダストとを混合した溶銑予備処
理剤における電気炉ダスト混合比率と安息角との関係を
示すグラフである。FIG. 3 is a graph showing a relationship between an electric furnace dust mixing ratio and a repose angle in a hot metal pretreatment agent obtained by mixing lime powder and electric furnace dust.
【図４】本発明例における溶銑予備処理剤の粉体吹込速
度の経時変化を示すグラフである。FIG. 4 is a graph showing the change over time of the powder blowing rate of the hot metal pretreatment agent in the example of the present invention.
【図５】比較例における溶銑予備処理剤の粉体吹込速度
の経時変化を示すグラフである。FIG. 5 is a graph showing a change over time of a powder blowing speed of a hot metal pretreatment agent in a comparative example.
１ 電気炉 ２ 燃焼塔 ３ 集塵機 ４ 専用コンテナ ５ ミキサー ６ 焼結ダストホッパ ７ タンクローリ ８ 貯蔵ホッパ ９、11 開閉弁 10 ディスペンサ 12 輸送管路 13 搬送気体 14 トピードカー 15 浸漬ランス 16 溶銑 17 ロータリフィーダ DESCRIPTION OF SYMBOLS 1 Electric furnace 2 Combustion tower 3 Dust collector 4 Dedicated container 5 Mixer 6 Sintered dust hopper 7 Tank lorry 8 Storage hopper 9, 11 On-off valve 10 Dispenser 12 Transport pipeline 13 Carrier gas 14 Topy car 15 Immersion lance 16 Hot metal 17 Rotary feeder
───────────────────────────────────────────────────── フロントページの続き Ｆターム(参考） 4K014 AA01 AA03 AB03 AB04 AC14 AC16 AD01 AD27 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4K014 AA01 AA03 AB03 AB04 AC14 AC16 AD01 AD27
Claims (3)
集塵ダストを、溶銑脱珪、脱燐処理する酸化剤として利
用する溶銑予備処理剤の製造に際し、前記酸化鉄含有集
塵ダストが粒径分布で50μm 以下の割合が50質量％以上
かつ凝集度が70を超える高い凝集性を有する超微粉集塵
ダストであり、該超微粉集塵ダストを貯蔵ホッパに受け
入れる前の段階で前記溶銑予備処理剤の５〜50質量％の
割合として、残部の酸化鉄および脱珪脱燐助剤を包含す
る粒径分布で50μm 超〜1000μm の割合が50質量％以上
かつ凝集度が70以下の低い凝集性を有する粉粒体と混合
させてなることを特徴とする酸化鉄含有集塵ダストを利
用した溶銑予備処理剤の製造方法。1. An iron oxide-containing dust-collecting dust, which is used in the production of a hot-metal pretreatment agent that uses the dust-collecting dust containing iron oxide discharged from a steelmaking-related facility as an oxidizing agent for de-siliconizing and dephosphorizing hot metal, is manufactured. Ultra-fine dust collecting dust having a high particle size distribution of 50% by mass or more and a cohesion degree of more than 70 with a particle size distribution of 50 μm or less, and the hot metal pre-dusting step before the ultra-fine dust collecting dust is received in a storage hopper. As a ratio of 5 to 50% by mass of the treating agent, the ratio of more than 50 μm to 1000 μm in the particle size distribution including the balance of iron oxide and desiliconization and dephosphorization aid is 50% by mass or more and the coagulation degree is 70 or less. A method for producing a hot metal pretreatment agent using iron oxide-containing dust-collecting dust, characterized by being mixed with a powdery material having a property.
理剤の10〜30質量％の割合とすることを特徴とする請求
項１記載の酸化鉄含有集塵ダストを利用した溶銑予備処
理剤の製造方法。2. The hot metal pretreatment agent using iron oxide-containing dust collection dust according to claim 1, wherein the ultrafine dust collection dust is in a ratio of 10 to 30% by mass of the hot metal pretreatment agent. Manufacturing method.
集塵ダストを、溶銑脱珪、脱燐処理する酸化剤として利
用する溶銑予備処理剤の使用に際し、前記酸化鉄含有集
塵ダストが粒径分布で50μm 以下の割合が50質量％以上
かつ凝集度が70を超える高い凝集性を有する超微粉集塵
ダストであり、該超微粉集塵ダストを前記溶銑予備処理
剤の５〜50質量％の割合として、残部の酸化鉄および脱
珪脱燐助剤を包含する粒径分布で50μm 超〜1000μm の
割合が50質量％以上かつ凝集度が70以下の低い凝集性を
有する粉粒体と混合させた前記溶銑予備処理剤を、ホッ
パあるいはディスペンサから排出する気送過程で超微粉
集塵ダストを分散させることを特徴とする酸化鉄含有集
塵ダストを利用した溶銑予備処理剤の使用方法。3. An iron oxide-containing dust-collecting dust, which is used as an oxidizing agent for utilizing the iron oxide-containing dust collected from the iron-making equipment as an oxidizing agent for de-siliconizing and dephosphorizing the hot metal, uses It is an ultrafine dust dust having a high cohesiveness in which the ratio of 50 μm or less in the diameter distribution is 50% by mass or more and the degree of agglomeration exceeds 70, and the ultrafine dust dust is 5 to 50% by mass of the hot metal pretreatment agent. In the particle size distribution including iron oxide and desiliconization dephosphorization aid, the ratio of more than 50 μm to 1000 μm is mixed with powder having low cohesion of 50 mass% or more and cohesion degree of 70 or less. A method of using a hot metal pretreatment agent utilizing iron oxide-containing dust collection dust, wherein ultrafine dust collection dust is dispersed in a pneumatic process of discharging the hot metal pretreatment agent from a hopper or a dispenser.
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|---|---|---|---|
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001102862A JP4599744B2 (en) | 2001-04-02 | 2001-04-02 | Method for producing hot metal pretreatment agent using dust collection dust containing iron oxide |
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| Publication Number | Publication Date |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010236017A (en) * | 2009-03-31 | 2010-10-21 | Jfe Steel Corp | Method and system for pre-treating molten iron |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62247015A (en) * | 1986-04-21 | 1987-10-28 | Kawasaki Steel Corp | Desiliconizing agent for molten iron |
| JPH0261005A (en) * | 1988-08-29 | 1990-03-01 | Kawasaki Steel Corp | Method for pretreating molten iron on casting floor in blast furnace |
| JPH0432506A (en) * | 1990-05-30 | 1992-02-04 | Kawasaki Steel Corp | Method for recyclingly utilizing desiliconizing agent on casting floor |
-
2001
- 2001-04-02 JP JP2001102862A patent/JP4599744B2/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62247015A (en) * | 1986-04-21 | 1987-10-28 | Kawasaki Steel Corp | Desiliconizing agent for molten iron |
| JPH0261005A (en) * | 1988-08-29 | 1990-03-01 | Kawasaki Steel Corp | Method for pretreating molten iron on casting floor in blast furnace |
| JPH0432506A (en) * | 1990-05-30 | 1992-02-04 | Kawasaki Steel Corp | Method for recyclingly utilizing desiliconizing agent on casting floor |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010236017A (en) * | 2009-03-31 | 2010-10-21 | Jfe Steel Corp | Method and system for pre-treating molten iron |
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