JPS62247015A - Desiliconizing agent for molten iron - Google Patents
Desiliconizing agent for molten ironInfo
- Publication number
- JPS62247015A JPS62247015A JP9008586A JP9008586A JPS62247015A JP S62247015 A JPS62247015 A JP S62247015A JP 9008586 A JP9008586 A JP 9008586A JP 9008586 A JP9008586 A JP 9008586A JP S62247015 A JPS62247015 A JP S62247015A
- Authority
- JP
- Japan
- Prior art keywords
- dust
- desiliconizing agent
- hot metal
- collected
- agent
- 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 68
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title abstract description 12
- 229910052742 iron Inorganic materials 0.000 title abstract description 6
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims abstract description 38
- 239000000428 dust Substances 0.000 claims abstract description 30
- 239000000203 mixture Substances 0.000 claims abstract description 12
- 238000009628 steelmaking Methods 0.000 claims abstract description 9
- 239000002184 metal Substances 0.000 claims description 56
- 229910052751 metal Inorganic materials 0.000 claims description 56
- 239000002245 particle Substances 0.000 claims description 23
- 239000002893 slag Substances 0.000 abstract description 19
- 230000007423 decrease Effects 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 3
- 238000010079 rubber tapping Methods 0.000 abstract description 2
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 238000012856 packing Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 description 14
- 238000011049 filling Methods 0.000 description 11
- 238000005187 foaming Methods 0.000 description 9
- 238000002156 mixing Methods 0.000 description 8
- 229910000805 Pig iron Inorganic materials 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 5
- 239000011362 coarse particle Substances 0.000 description 5
- 238000010298 pulverizing process Methods 0.000 description 3
- 239000004576 sand Substances 0.000 description 3
- 238000005422 blasting Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 238000003892 spreading Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- YOBAEOGBNPPUQV-UHFFFAOYSA-N iron;trihydrate Chemical compound O.O.O.[Fe].[Fe] YOBAEOGBNPPUQV-UHFFFAOYSA-N 0.000 description 1
- 239000011812 mixed powder Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000002203 pretreatment Methods 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 238000000790 scattering method Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 238000011144 upstream manufacturing Methods 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、高炉鋳床に設置された出銑樋端に近接して設
けられた傾斜樋に落下する溶銑に対し、その浴面に投射
して脱珪処理するための溶銑脱珪剤に関するものである
。[Detailed Description of the Invention] (Industrial Application Field) The present invention is directed to projecting onto the bath surface of hot metal that falls into an inclined trough that is installed close to the end of a tap trough installed in a blast furnace casthouse. This invention relates to a desiliconizing agent for hot metal for desiliconizing treatment.
（従来の技術）
溶銑予備処理における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公昭５８−５６７２３号に開示さ
れている散布方式と、出銑樋端に近接して設けられた傾
斜樋内の溶銑に対し、脱珪剤を投射添加する特開昭５９
−１４３０１０号などに開示されている投射方式とが知
られている。前者の散布方式では、散布された脱珪剤と
溶銑との反応を確保するため、出銑樋の上流でその散布
が行われ、流下過程ならびに出銑樋端から傾斜樋への落
下位置での落下エネルギーによる攪拌混合過程で脱珪反
応を生じている。後者の投射方式は、一般に出銑Ｉｉ！
端の傾斜樋において行われ、傾斜樋へ落下する溶銑の落
下位置に前記投射がなされ、脱珪反応を生じさせている
。(Prior art) Japanese Patent Publication No. 58-56723 which sprays a desiliconizing agent mainly composed of iron oxide onto hot metal in a tap trough installed in a blast furnace casthouse during pre-treatment of hot metal to remove desiliconization in the process of flowing down. JP-A No. 59, in which a desiliconizing agent is added by spraying to the hot metal in an inclined trough installed close to the end of the tap trough.
A projection method disclosed in Japanese Patent No. 143010 and the like is known. In the former spraying method, in order to ensure the reaction between the sprayed desiliconizing agent and the hot metal, it is sprayed upstream of the tap culvert, and this prevents it from falling during the flow process and at the point where it falls from the end of the tap chutes to the sloping culvert. A desiliconization reaction occurs during the stirring and mixing process using energy. The latter projection method is generally used for tapping Ii!
The projection is carried out in the inclined trough at the end, and the projection is made at the falling position of the hot metal falling into the slanted trough, causing a desiliconization reaction.
特開昭５９−２５９１．３には、散布方式において溶銑
表面に添加形成された脱珪剤層の上面と溶銑表面の間の
レベルに溶銑樋の内側下方に突出した押圧下面が位置す
る樋蓋を溶銑樋に載置させ、ＦＡＭの押圧壁によって脱
珪剤を溶銑表面下に押圧し、脱珪剤と溶銑の接触攪拌を
行わせることによる溶銑の連続脱珪方法が開示されてお
り、特開昭６１−３３６４号には出銑樋通過中に脱珪処
理する脱珪剤の粒度構成を特定し、脱珪効率の向上と、
排滓性の良い脱珪スラグを得る溶銑脱珪剤が開示されて
いる。JP-A-59-2591.3 discloses a gutter cover in which a pressed lower surface protruding downward from the inside of a hot metal gutter is located at a level between the top surface of a desiliconizing agent layer added and formed on the surface of hot metal and the surface of the hot metal in a spreading method. A method for continuous desiliconization of hot metal is disclosed, in which a desiliconizing agent is placed on a hot metal trough, a desiliconizing agent is pressed below the surface of the hot metal by a pressing wall of an FAM, and the desiliconizing agent and the hot metal are stirred in contact with each other. No. 1983-3364 specifies the particle size structure of a desiliconizing agent that is desiliconized while passing through the tap hole, and improves desiliconization efficiency.
A desiliconizing agent for hot metal that produces desiliconized slag with good slag removal properties is disclosed.
（発明が解決しようとする問題点）
従来の散布方式および投射方式による溶銑脱珪処理には
、粒径１ｍｍ以下の脱珪剤が一般に用いられている。こ
れらの脱珪剤は粉砕処理によって粒調がなされるため、
粒度分布として１００μｍ以下の比率が少ないものが用
いられている。従って溶銑脱珪を実施する際、粒径が大
きいため溶銑との反応速度が遅く、反応は前記傾斜樋よ
り投入された溶銑運搬装置内での反応が主体となる。そ
の結果溶銑運搬装置内での脱珪スラグ中に未反応の酸化
鉄が増加し、スラグフォーミングを生じ、フォーミング
防止剤を添加しても溶銑充填量の低下がさけられなかっ
た。またスラグフォーミングが生じるため脱珪剤の投入
量の上限が制限され、溶銑内のＳｉ成分量に応じた脱珪
剤の投入量を制御しようとしても、Ｓｉ成分量が高い場
合には投入量の制限のため一定限度のＳｉ成分しか脱珪
処理が行われず、スラグ中に酸化鉄として酸素成分が逃
げるため高いレベルの反応効率が望めなかった。さらに
、溶銑運搬装置内でスラグフォーミングが生じると、次
工程の脱燐処理を実施する際必要とする溶湯面レベルの
制御も不可能であった。(Problems to be Solved by the Invention) A desiliconizing agent having a particle size of 1 mm or less is generally used in the conventional desiliconizing treatment of hot metal using the scattering method and the projection method. These desiliconizing agents have a granular shape through the crushing process, so
As for the particle size distribution, those having a small ratio of 100 μm or less are used. Therefore, when performing desiliconization of hot metal, the reaction rate with hot metal is slow due to the large particle size, and the reaction mainly occurs in the hot metal conveying device introduced from the inclined trough. As a result, unreacted iron oxide increased in the desiliconizing slag in the hot metal conveyance equipment, causing slag foaming, and even if a foaming inhibitor was added, a decrease in the amount of hot metal filling could not be avoided. In addition, since slag forming occurs, the upper limit of the amount of desiliconizing agent input is limited, and even if attempts are made to control the amount of desiliconizing agent input according to the amount of Si component in the hot metal, if the amount of Si component is high, the amount of desiliconizing agent input is limited. Due to restrictions, only a certain limit of Si components can be desiliconized, and oxygen components escape into the slag as iron oxide, making it impossible to expect a high level of reaction efficiency. Furthermore, when slag foaming occurs in the hot metal conveying device, it is impossible to control the molten metal surface level, which is necessary when carrying out the next step of dephosphorization treatment.
前記特開昭５９−２５９１３号の散布方式における脱珪
剤を溶銑樋内の溶銑下に押込む方法は、押込位置でのス
ラグフォーミングの発生に問題があり、特開昭６１−３
３６４号の脱珪剤の粒度構成を特定する方法は、粒調の
ためのコスト増に問題がある。また投射方式による場合
も同じで、粒度が大であれば、投射後の溶銑は溶銑運搬
装置内に排出され、運搬装置内においてフォーミングを
発生し、そのため細粒を指向する傾向にあるためコスト
増となっていた。The method of pushing the desiliconizing agent under the hot metal in the hot metal gutter in the spreading method of JP-A No. 59-25913 has a problem in that slag forming occurs at the pushing position.
The method of specifying the grain size structure of the desiliconizing agent of No. 364 has a problem in that the cost increases due to the grain size. The same applies to the case of the blasting method; if the particle size is large, the hot metal after blasting will be discharged into the hot metal conveying device, and forming will occur in the conveying device, which will tend to produce finer particles, increasing costs. It became.
（問題点を解決するための手段） 本発明は、従来技術の存する前記問題点を除去。(Means for solving problems) The present invention eliminates the above-mentioned problems existing in the prior art.
改善した溶銑脱珪剤を提供することを目的とし、特許請
求の範囲記載の溶銑脱珪剤を提供することによって、前
記目的を達成することができる。すなわち高炉鋳床に設
置された出銑樋に近接して設けられた傾斜樋へ落下する
溶銑の浴面に投射して脱珪処理するための高炉鋳床集塵
、製鋼工場建屋集塵で捕集される集塵ダストと粗粒酸化
鉄との混合物よりなる溶銑脱珪剤において、前記混合粉
は粒度３ｍｍ以下乃至１００μｍを超える粗粒酸化鉄５
〜３０重量％、残部１００μｍ以下の集塵ダストよりな
る混合物であることを特徴とする溶銑脱珪剤に関するも
のである。It is an object of the present invention to provide an improved desiliconizing agent for hot metal, and the above object can be achieved by providing the desiliconizing agent for hot metal pig iron as described in the claims. In other words, dust is collected in the blast furnace casthouse for desiliconization by projecting it onto the bath surface of the hot metal that falls into the sloped trough installed in the vicinity of the tap trough installed in the blast furnace casthouse, and it is collected in the steelmaking factory building dust collection. In a hot metal desiliconization agent made of a mixture of collected dust and coarse iron oxide, the mixed powder contains coarse iron oxide 5 with a particle size of 3 mm or less to over 100 μm.
The present invention relates to a desiliconizing agent for hot metal, characterized in that it is a mixture consisting of collected dust of ~30% by weight and the balance of 100 μm or less.
次に本発明の詳細な説明する。Next, the present invention will be explained in detail.
本発明は、高炉鋳床に設置された出銑樋端に近接して設
けられた傾斜樋へ落下する溶銑に対し、その浴面に溶銑
脱珪剤を投射する投射方式による脱珪処理において脱珪
剤の粒径が１００μｍ以下であると、脱珪反応効率は７
０％程度に達するが、それ以上の効率を上げることが困
難であることは、脱珪剤粒径が小さいと反応性はよいが
、個々の粒子の質量が小さく、また粒子集合粉の嵩比重
も１゜２〜１．５と軽いため、比重約７と大きい溶銑中
への侵入が少なく、その結果反応効率が低くなることに
本発明者は想到し、細粉脱珪剤に粗粒脱珪剤を混合する
ことにより、粗粒が投射により十分なエネルギーを得て
浴面下へ達し、細粒脱珪剤も同時に侵入することを知見
し、細粒脱珪剤に粗粒脱珪剤を混合することにより、脱
珪反応効率を７０％以上に効率を上げることができた。The present invention provides desiliconization treatment using a projection method in which a hot metal desiliconizing agent is projected onto the bath surface of hot metal falling into a sloped gutter provided close to the end of a tap hole installed in a blast furnace casthouse. When the particle size of the agent is 100 μm or less, the desiliconization reaction efficiency is 7.
It reaches about 0%, but it is difficult to increase the efficiency beyond that because the reactivity is good when the particle size of the desiliconizing agent is small, but the mass of the individual particles is small, and the bulk specific gravity of the particle aggregate powder The inventors came up with the idea that since the powder is light at 1°2 to 1.5, it hardly penetrates into the hot metal, which has a specific gravity of about 7, and as a result, the reaction efficiency becomes low. It was discovered that by mixing a silica, the coarse particles gain sufficient energy through projection and reach below the bath surface, and the fine desiliconizing agent also penetrates at the same time. By mixing these, it was possible to increase the desiliconization reaction efficiency to 70% or more.
さらに細粒脱珪剤酸化鉄には高炉の鋳床集塵、製鋼工場
建屋集塵で捕集される平均粒径より集塵ダスト粒径１０
０μｍ以下の空気輸送する際、乾燥の必要がなく、廃棄
物である集塵ダストを用い、粗粒酸化鉄として、粉砕を
要しない０．１〜３ｍｍを７０％含む粉鉱石。Furthermore, the fine grain desiliconizing iron oxide has a dust particle size of 10% compared to the average particle size collected in blast furnace casting bed dust collection and steelmaking factory building dust collection.
Powdered ore containing 70% of coarse iron oxide particles of 0.1 to 3 mm, which do not require pulverization, and which do not require drying when being transported by air with a size of 0 μm or less, using collected dust as a waste product.
あるいは平均粒径２００μｍ程度の砂鉄を用いることに
よりコストを低減させると共に脱珪効率を上昇させるこ
とができるに至り、本発明を完成した。Alternatively, by using iron sand with an average particle size of about 200 μm, it was possible to reduce the cost and increase the desiliconization efficiency, thereby completing the present invention.
第１図は横軸に脱珪剤として高炉の鋳床集塵。In Figure 1, the horizontal axis shows dust collected from the cast bed of a blast furnace as a desiliconizing agent.
製鋼工場建屋集塵で捕集される１００μｍ以下の集塵ダ
ストの酸化鉄に、１００μｍを超える粗粒酸化鉄を配合
する比率（％）と縦軸に×−×で示した脱珪反応効率（
％）及びＯ−○で示したスラグフォーミングの影響にょ
る溶銑運搬装置内の受銑１ （）ン／Ｔ／Ｃ） との関
係を図示した図である。The ratio (%) of coarse grained iron oxide of more than 100 μm to the iron oxide of the collected dust of less than 100 μm collected in steelmaking factory building dust collection and the desiliconization reaction efficiency (x-x shown on the vertical axis)
%) and the relationship between the received pig iron in the hot metal conveying device due to the influence of slag forming indicated by O-○.
第１図より細粒脱珪剤である細粒ダストに粗粒脱珪剤を
５％以上混入すると、粗粒が溶銑中へ良く侵入するため
、細粒をも巻き込む効果により細粒が育効に利用され、
脱珪反応効率（％）が７０％以上となった。この効果は
配合比率３０％位までであり、これ以上混合すると、反
応効率の遅い粗粒の影響が現われ始め、溶銑運搬装置内
でのスラグフォーミングが多くなり、受銑量が低下する
。Figure 1 shows that when 5% or more of coarse grain desiliconizing agent is mixed with fine grain dust, which is a fine grain desiliconizing agent, the coarse grains will penetrate well into the hot metal, and the fine grains will be involved in the growth of the fine grains. used for
The desiliconization reaction efficiency (%) was 70% or more. This effect is effective up to a blending ratio of about 30%; if the mixture exceeds this level, the influence of coarse particles with slow reaction efficiency begins to appear, increasing slag foaming in the hot metal conveying equipment and reducing the amount of pig iron received.
従って、粒径１００μｍ以下の細粒脱珪剤酸化鉄集塵ダ
ストに配合する１００μｍを越える粗粒脱珪剤酸化鉄の
配合比率は５％以上から３０％以下とする必要がある。Therefore, the blending ratio of the coarse desiliconizing iron oxide particles having a particle size of more than 100 μm to be blended with the fine desiliconizing iron oxide dust collection dust having a particle size of 100 μm or less needs to be from 5% to 30%.
次に本発明を実施例について説明する。Next, the present invention will be explained with reference to examples.
（実施例）
傾斜樋へ落下する溶銑に対し、その浴面に投射方式によ
り脱珪処理をけう脱珪剤として、従来用いられている粒
径０．１〜１ｍｍの脱珪剤を使用した場合と本発明の細
粒として粒径６０μｍの集塵ダスト８０％、粗粒として
平均粒径２００μｍの砂鉄２０％を配合した脱珪剤を使
用した場合っにいて、特性を比較調査した。(Example) A case where a conventionally used desiliconizing agent with a particle size of 0.1 to 1 mm is used as a desiliconizing agent to perform desiliconizing treatment by projecting onto the bath surface of hot metal falling into an inclined trough. The characteristics were compared and investigated using the desiliconizing agent of the present invention containing 80% of collected dust with a particle size of 60 μm as fine particles and 20% of iron sand with an average particle size of 200 μm as coarse particles.
第２図は粗粒配合率（重量％）とスラグフォーミング発
生率の関係を示す図で、３０％を超えるとスラグフォー
ミング発生率が急上昇しており、従って粗粒配合率は３
０％以下にする必要がある。Figure 2 is a diagram showing the relationship between the coarse grain content ratio (wt%) and the slag foaming occurrence rate.The slag foaming occurrence rate increases rapidly when it exceeds 30%, so the coarse grain content ratio is 3.
It is necessary to keep it below 0%.
第３図は、溶銑内Ｓｉ成分量０．３０％の場合での脱珪
剤原単位（ｋｇ／ｌ、ρ〕すなわち脱珪剤投射量と反応
効率（％）および溶銑運搬装置内の溶銑充填率（％）と
の関係を示す図で、Ｏ印は反応効率、×印は溶銑充填率
、実線は従来脱珪剤、破線は本発明になる脱珪剤の結果
を示す。なお溶銑充填率は脱珪処理なしの時を１００％
として表示している。Figure 3 shows the desiliconizing agent unit (kg/l, ρ), that is, the amount of desiliconizing agent projected, the reaction efficiency (%), and the filling of the hot metal in the hot metal conveying device when the Si content in the hot metal is 0.30%. In this figure, the O mark shows the reaction efficiency, the x mark shows the hot metal filling rate, the solid line shows the results of the conventional desiliconizing agent, and the broken line shows the results of the desiliconizing agent of the present invention.The hot metal filling rate is 100% without desiliconization treatment
It is displayed as.
脱珪剤の投射量の増加に伴い従来および本発明剤とも反
応効率は低下するが、本発明剤は従来剤に比較して反応
効率は高（、本発明剤により約２０％の効率向上がある
。また投射量の増加に伴い、未反応剤により溶銑運搬装
置内でのスラグフォーミングが誘起されることになり、
結果としてこのフォーミングは充填率の低下となるが、
本発明剤は高い充填率を維持することができ、従来剤に
比較して充填率は約１５％増加した結果を示している。Although the reaction efficiency of both the conventional agent and the present invention agent decreases as the amount of the desiliconizing agent sprayed increases, the reaction efficiency of the present invention agent is higher than that of the conventional agent (the present agent improves efficiency by about 20%). In addition, as the amount of injection increases, slag forming will be induced in the hot metal conveyance equipment due to unreacted reagents.
As a result, this forming reduces the filling rate, but
The agent of the present invention can maintain a high filling rate, and the filling rate is increased by about 15% compared to the conventional agent.
従って上限投入量を５ ｋｇ／ｌ、ｐ増加できる。Therefore, the upper limit input amount can be increased by 5 kg/l, p.
第４図はフリーボード値（ｍ）すなわち溶銑運搬装置内
の口元から場面までの距離を、製銑側（注銑側）と受入
光である製鋼側とでの対応を示す図で、Ｏ印は従来脱珪
剤、ｘ印は本発明脱珪剤を示す。本発明剤は両者のフリ
ーボード値は良い一致が示されているが、従来剤は製鋼
側の値が大きくなっており、この相違は溶銑運搬装置内
におけるスラグフォーミングの発注率が多いことを示し
ている。このことからも従来剤の溶銑充填率の低下はさ
けられない、従って、本発明剤を使用することにより浴
面レベルの制御精度の向上が行われる。Figure 4 is a diagram showing the correspondence between the freeboard value (m), that is, the distance from the mouth of the hot metal conveying device to the scene, between the pig iron making side (pigment pouring side) and the steel making side, which receives light. 1 indicates a conventional desiliconizing agent, and an x indicates a desiliconizing agent of the present invention. The present invention agent shows good agreement in the freeboard values of the two, but the conventional agent has a higher value on the steelmaking side, and this difference indicates that the order rate for slag forming in hot metal conveying equipment is high. ing. For this reason as well, a decrease in the hot metal filling rate of the conventional agent cannot be avoided.Therefore, by using the agent of the present invention, the control accuracy of the bath surface level can be improved.
上記の結果から、本発明による脱珪剤を使用したことに
より、スラグフォーミングが減少するため、反応効率２
０％向上、溶銑充填率１５％向上、浴面レベル制御精度
の向上、上限投入量を５ ｋｇ／ｌ、ｐ増加の結果を達
成した。From the above results, it can be seen that by using the desiliconizing agent according to the present invention, slag foaming is reduced, so the reaction efficiency is increased.
0% improvement, a 15% improvement in the hot metal filling rate, an improvement in bath level control accuracy, an upper limit input amount of 5 kg/l, and an increase in p.
さらに細粒脱珪剤酸化鉄には高炉の鋳床集塵。Furthermore, the fine grain desiliconizing agent iron oxide is used to collect dust from the cast bed of a blast furnace.
製鋼工場建屋集塵で捕集される集塵ダストを使用し、粗
粒酸化鉄として粉砕を要しない粉磁石、砂鉄を使用混合
することにより、粉砕９選別混合の前処理コストの削減
、廃棄物（ダスト）処理が可能となり、低コスト処理が
可能となった。By using the dust collected in the steel factory building dust collection and mixing it with powdered magnets and iron sand that do not require pulverization as coarse iron oxide, the pretreatment cost of pulverization 9 sorting mixture can be reduced and waste can be reduced. (dust) treatment has become possible, and low-cost treatment has become possible.
（発明の効果）
本発明により、出銑樋端に設けられた傾斜樋へ落下する
溶銑に、その浴面に投射方式により脱珪処理を行う脱珪
剤として、高炉鋳床、製鋼工場建屋で捕集される１００
μｍ以下の集塵ダストの細粒酸化鉄を主体とし、この酸
化鉄中に３１ｎｆｆ１以下乃至１００μｍを越える粗粒
酸化鉄を混合物全量中５〜３０％の範囲混合する脱珪剤
を用いることにより、スラグフォーミングの発生率が減
少することにより、脱珪反応効率の向上、溶銑充填率の
向上、脱珪剤上限投入量の増加、浴面レベル制御精度の
向上ができ、低コスト処理が可能となる。(Effects of the Invention) According to the present invention, it can be used as a desiliconizing agent to remove desiliconization by projecting onto the bath surface of the hot metal falling into the inclined gutter provided at the end of the tapwater. 100 collected
By using a desiliconizing agent that is mainly composed of fine iron oxide of collected dust of 1 μm or less, and in which coarse iron oxide of 31nff1 or less to more than 100 μm is mixed in the range of 5 to 30% of the total amount of the mixture, By reducing the incidence of slag foaming, it is possible to improve the desiliconization reaction efficiency, improve the hot metal filling rate, increase the upper limit of the amount of desiliconizing agent to be added, and improve the accuracy of bath level control, making it possible to perform low-cost processing. .
第１図は本発明による脱珪剤の粗粒配合比率と、反応効
率および受銑量の関係を示す図。
第２図は脱珪剤の粗粒配合比率と、スラグフォーミング
発生率の関係を示す図。
第３図は本発明と従来の脱珪剤による使用原単位と反応
効率および溶銑充填率の関係を示す図。
第４図は本発明剤と従来剤による製銑側と製鋼側のフリ
ーボード値の関係を示す図である。
特許出願人 川崎製鉄株式会社
代理人 弁理士 村 １）政 治
第１図
第２図FIG. 1 is a diagram showing the relationship between the coarse particle blending ratio of the desiliconizing agent according to the present invention, the reaction efficiency, and the amount of pig iron received. FIG. 2 is a diagram showing the relationship between the coarse particle blending ratio of the desiliconizing agent and the slag foaming occurrence rate. FIG. 3 is a diagram showing the relationship between consumption consumption, reaction efficiency, and hot metal filling rate using the present invention and a conventional desiliconizing agent. FIG. 4 is a diagram showing the relationship between the freeboard values on the pig iron making side and the steel making side using the present invention agent and the conventional agent. Patent applicant Kawasaki Steel Co., Ltd. Agent Patent attorney Mura 1) Politics Figure 1 Figure 2
Claims (1)
樋へ落下する溶銑の浴面に投射して脱珪処理するための
高炉鋳床集塵、製鋼工場建屋集塵で捕集される集塵ダス
トと粗粒酸化鉄との混合物よりなる溶銑脱珪剤において
、前記混合物は粒度３ｍｍ以下乃至１００μｍを超える
粗粒酸化鉄５〜３０重量％、残部１００μｍ以下の集塵
ダストよりなる混合物であることを特徴とする溶銑脱珪
剤。Dust from the blast furnace casthouse is collected by projecting it onto the bath surface of the hot metal that falls into the inclined gutter installed in the vicinity of the tap flute installed in the blast furnace casthouse for desiliconization, and by collecting dust from the steelmaking factory building. In a hot metal desiliconizing agent comprising a mixture of collected dust and coarse-grained iron oxide, the mixture consists of 5 to 30% by weight of coarse-grained iron oxide with a particle size of 3 mm or less to over 100 μm, and the remainder composed of collected dust with a particle size of 100 μm or less. A hot metal desiliconizing agent characterized in that it is a mixture.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61090085A JPH0819448B2 (en) | 1986-04-21 | 1986-04-21 | Hot metal desiliconizer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61090085A JPH0819448B2 (en) | 1986-04-21 | 1986-04-21 | Hot metal desiliconizer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62247015A true JPS62247015A (en) | 1987-10-28 |
| JPH0819448B2 JPH0819448B2 (en) | 1996-02-28 |
Family
ID=13988683
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61090085A Expired - Fee Related JPH0819448B2 (en) | 1986-04-21 | 1986-04-21 | Hot metal desiliconizer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0819448B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0277512A (en) * | 1988-09-12 | 1990-03-16 | Kobe Steel Ltd | Raw material for molten iron pre-treating material |
| JP2002294320A (en) * | 2001-04-02 | 2002-10-09 | Kawasaki Steel Corp | Method for producing molten iron pretreating agent utilizing iron oxide-containing collected dust |
| CN115074478A (en) * | 2022-06-29 | 2022-09-20 | 中冶华天工程技术有限公司 | Efficient desiliconization agent and desiliconization method for molten iron pretreatment |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58151410A (en) * | 1982-03-03 | 1983-09-08 | Kobe Steel Ltd | Molten iron desiliconizing agent |
| JPS602611A (en) * | 1983-06-20 | 1985-01-08 | Kawasaki Steel Corp | Desiliconizing agent mixed with light burned dolomite for treating molten iron |
-
1986
- 1986-04-21 JP JP61090085A patent/JPH0819448B2/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58151410A (en) * | 1982-03-03 | 1983-09-08 | Kobe Steel Ltd | Molten iron desiliconizing agent |
| JPS602611A (en) * | 1983-06-20 | 1985-01-08 | Kawasaki Steel Corp | Desiliconizing agent mixed with light burned dolomite for treating molten iron |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0277512A (en) * | 1988-09-12 | 1990-03-16 | Kobe Steel Ltd | Raw material for molten iron pre-treating material |
| JPH0438809B2 (en) * | 1988-09-12 | 1992-06-25 | ||
| JP2002294320A (en) * | 2001-04-02 | 2002-10-09 | Kawasaki Steel Corp | Method for producing molten iron pretreating agent utilizing iron oxide-containing collected dust |
| JP4599744B2 (en) * | 2001-04-02 | 2010-12-15 | Ｊｆｅスチール株式会社 | Method for producing hot metal pretreatment agent using dust collection dust containing iron oxide |
| CN115074478A (en) * | 2022-06-29 | 2022-09-20 | 中冶华天工程技术有限公司 | Efficient desiliconization agent and desiliconization method for molten iron pretreatment |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0819448B2 (en) | 1996-02-28 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP4818567B2 (en) | Refining agent and refining method | |
| ZA200109971B (en) | Method for conditioning slag with the addition of metallurgical residual materials and an installation for the same. | |
| JPS62247015A (en) | Desiliconizing agent for molten iron | |
| CN105112598B (en) | A kind of method that converter product bottom slag is directly used in pneumatic steelmaking | |
| JP2002220615A (en) | Converter steelmaking method | |
| JP3297801B2 (en) | Hot metal removal method | |
| JP2022021235A (en) | Production method of modified converter slag and production method of granular material for road bed material | |
| JP2672588B2 (en) | Hot Metal Pretreatment Method in Blast Furnace Castings | |
| US6638337B1 (en) | Method of introducing additives in steelmaking | |
| JP4599744B2 (en) | Method for producing hot metal pretreatment agent using dust collection dust containing iron oxide | |
| JP2022176169A (en) | Method of reforming material, method of smelting molten iron, and method of producing slag material | |
| JP2581900B2 (en) | Supply method of smelting powder and granules to metallurgical furnace | |
| JP3869091B2 (en) | How to use desiliconized slag | |
| JP3794048B2 (en) | Hot metal desiliconization method | |
| JPS596310A (en) | Desiliconizer for molten pig | |
| JPS6314041B2 (en) | ||
| JP2004218026A (en) | Method for treating molten iron | |
| JP2011038156A (en) | Steel-making refinery process using converter, and method for producing low phosphorus steel | |
| JPH0517809A (en) | Hearth desulfurization method for blast furnace | |
| JPS58151410A (en) | Molten iron desiliconizing agent | |
| CN108588317A (en) | a kind of ultra-pure pig iron preparation system and preparation method | |
| JPS62158814A (en) | Composite refining agent and refining method | |
| JPH0277512A (en) | Raw material for molten iron pre-treating material | |
| JPH01129918A (en) | Method for continuously desiliconizing molten iron | |
| JPS6013011A (en) | Method for desiliconizing molten iron |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| S531 | Written request for registration of change of domicile |
Free format text: JAPANESE INTERMEDIATE CODE: R313531 |
|
| S533 | Written request for registration of change of name |
Free format text: JAPANESE INTERMEDIATE CODE: R313533 |
|
| R350 | Written notification of registration of transfer |
Free format text: JAPANESE INTERMEDIATE CODE: R350 |
|
| LAPS | Cancellation because of no payment of annual fees |