JPS6335730A - Method and device for charging powder ore to smelting and reducing furnace - Google Patents
Method and device for charging powder ore to smelting and reducing furnaceInfo
- Publication number
- JPS6335730A JPS6335730A JP18137186A JP18137186A JPS6335730A JP S6335730 A JPS6335730 A JP S6335730A JP 18137186 A JP18137186 A JP 18137186A JP 18137186 A JP18137186 A JP 18137186A JP S6335730 A JPS6335730 A JP S6335730A
- Authority
- JP
- Japan
- Prior art keywords
- metal bath
- ore
- cake
- furnace
- slurry
- 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.)
- Pending
Links
- 238000003723 Smelting Methods 0.000 title claims description 14
- 238000000034 method Methods 0.000 title claims description 14
- 239000000843 powder Substances 0.000 title abstract description 13
- 239000002184 metal Substances 0.000 claims abstract description 42
- 229910052751 metal Inorganic materials 0.000 claims abstract description 42
- 238000007664 blowing Methods 0.000 claims abstract description 19
- 239000002002 slurry Substances 0.000 claims abstract description 15
- 239000002893 slag Substances 0.000 claims description 10
- 238000002844 melting Methods 0.000 claims description 9
- 230000008018 melting Effects 0.000 claims description 9
- 238000010406 interfacial reaction Methods 0.000 claims description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 2
- 229910052799 carbon Inorganic materials 0.000 abstract description 2
- 238000003756 stirring Methods 0.000 abstract description 2
- 238000006722 reduction reaction Methods 0.000 description 17
- 238000006243 chemical reaction Methods 0.000 description 14
- 239000007789 gas Substances 0.000 description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 239000003575 carbonaceous material Substances 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 3
- 229910001882 dioxygen Inorganic materials 0.000 description 3
- 239000012768 molten material Substances 0.000 description 3
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 239000000571 coke Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- 229910000805 Pig iron Inorganic materials 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 235000019402 calcium peroxide Nutrition 0.000 description 1
- 239000003610 charcoal Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000001294 propane Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
Landscapes
- Manufacture Of Iron (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、酸化物系鉱石を溶融還元するに際して、高い
還元効率が得られるように粉鉱石を装入する方法及び装
置に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method and apparatus for charging fine ore so as to obtain high reduction efficiency when smelting and reducing oxide ore.
最近、高炉・転炉法に代わる製鋼技術として溶融還元製
錬法が注目を浴びている。この方法で使用する溶融還元
炉は、使用する原料に制約を受けることなく、より小規
模な設備により鉄系合金溶湯を製造することを目的とし
て開発されたものである。Recently, the smelting reduction smelting method has been attracting attention as a steelmaking technology to replace the blast furnace/converter method. The smelting reduction furnace used in this method was developed for the purpose of producing molten iron-based alloys using smaller-scale equipment without being restricted by the raw materials used.
このような溶融還元炉の一つとして、本発明者等は先に
第４図に示す形式の炉を提案した（特願昭６１−２２８
９５号）。この炉は、固定式の縦型炉部ｌと該縦型炉部
１に対して着脱可能に設けられた容器部２を備えている
。容器部２は、台車３に載１１されており、別の容器部
２と容易に交換することを可能にしている。As one of such melting reduction furnaces, the present inventors previously proposed a furnace of the type shown in Fig. 4 (Japanese Patent Application No. 61-228).
No. 95). This furnace includes a fixed vertical furnace section 1 and a container section 2 that is detachably attached to the vertical furnace section 1. The container part 2 is mounted 11 on a trolley 3, making it possible to easily replace it with another container part 2.
容器部２は、主とし”Ｃメタル浴８等からなる溶融物を
収容するものであり、酸素ガス及びプロパン、微わ）炭
等の燃料を溶融物に吹き込む底吹き羽口１１が底壁に設
けられている。底吹き羽口１１を介して容器部２内に吹
き込まれたガスは、メタル浴８中を気泡１０となって上
昇し、装入原料に対する還元反応を進める。The container section 2 mainly contains a molten material consisting of a C metal bath 8, etc., and has a bottom blowing tuyere 11 on the bottom wall for blowing fuel such as oxygen gas, propane, and charcoal into the molten material. The gas blown into the container part 2 through the bottom blowing tuyere 11 rises in the metal bath 8 as bubbles 10, and proceeds with the reduction reaction to the charged raw material.
また、容器部２の下部には出湯口１２が設けられており
、ごの出湯口１２を介して任意の時間に溶融金属、スラ
グ等の溶融物が炉外に排出される。Further, a tap hole 12 is provided at the bottom of the container portion 2, and molten metal, slag, and other molten materials are discharged out of the furnace through the tap hole 12 at any given time.
他方、縦型炉部１は、垂直円筒状或いは部分的に径大化
した円筒状の形状を備えている。該縦型炉部１の下部は
容器部２に密着・離脱自在にされており、その上部は排
ガス１３を徘ガス利用系に送るためのダクトにつながっ
ている。４８４１型炉部１の下部は、フォーミングした
スラグ層９の一部に浸漬されている。On the other hand, the vertical furnace section 1 has a vertical cylindrical shape or a cylindrical shape with a partially enlarged diameter. The lower part of the vertical furnace part 1 is attached to and detachable from the container part 2, and the upper part is connected to a duct for sending the exhaust gas 13 to the wandering gas utilization system. The lower part of the 4841 type furnace part 1 is immersed in a part of the formed slag layer 9.
この縦型炉部ｌには、垂直上方からランス４及び斜め上
方又は横方向から複数のランス５が挿入されるようにな
っている。これらランス４．５から、酸素ガス等のガス
及び／又は鉱石１石炭等の粉体が炉内に吹き込まれる。A lance 4 and a plurality of lances 5 are inserted into the vertical furnace section 1 from vertically above and from diagonally above or laterally. Gas such as oxygen gas and/or powder such as ore 1 coal is blown into the furnace from these lances 4.5.
更に、この縦型炉部ｌには、鉱石又はその成形物、塊状
炭材等の塊状物を投入するための塊状物投入装置６が設
けられており、この塊状物投入装置６はスクリューフィ
ーダー６ａを備えている。Furthermore, this vertical furnace part l is provided with a lump charging device 6 for charging lumps such as ore or its molded material, lump carbonaceous material, etc., and this lump charging device 6 is connected to a screw feeder 6a. It is equipped with
この溶融還元炉においては、炭材が懸濁しているスラグ
Ｉ’！Ｊ９とメタル浴８との接触を充分に行うごとによ
り、その界面における製錬反応を促進さ七る。また、ス
ラグ層９中でもＣ＋Ｆｅ０＝Ｆｅ＋ＣＯの反応を行って
いる。そこで、このようなスラグ層９に対する鉱石原料
の装入を工夫することが重要となる。In this melting reduction furnace, slag I'! in which carbonaceous materials are suspended is used. By sufficiently bringing J9 into contact with the metal bath 8, the smelting reaction at the interface is promoted. Moreover, the reaction of C+Fe0=Fe+CO is also performed in the slag layer 9. Therefore, it is important to devise ways to charge the ore raw material into the slag layer 9.
溶融還元性以外の製錬法において使用されている鉱石原
料は、その形態は専ら装入の容易性を主眼において考え
られていた。これに対し、溶融還元法においては、前述
したように今までの製錬反応とは異なり、溶融金属とス
ラグとの界面における反応を主体とするものであり、且
つその反応には所定の熱を必要とする。The form of ore raw materials used in smelting methods other than smelting-reduction methods has been considered primarily with ease of charging in mind. On the other hand, in the smelting reduction method, as mentioned above, unlike the conventional smelting reaction, the reaction mainly occurs at the interface between the molten metal and the slag, and the reaction requires a certain amount of heat. I need.
ところが、粉鉱石を浴面上方から投入するときには、落
下の過程で消費される割合が大きく、その粉鉱石が溶融
金属とスラグとの界面に達する確率は低い。たとえば、
炉内を上昇する排ガスに随伴され、反応域に効率良く添
加することができない。また、底吹き羽口を介して炉底
から粉鉱石を吹き込む場合には、装入された粉鉱石がガ
スと一緒に吹き抜けることがあり、充分な滞留時間が得
られない。そのため、この底吹きによっても添加効率を
窩くすることには限度がある。更に、底吹き羽口を介し
た吹込みによる場合、メンテナンスが困難なものとなる
。However, when fine ore is introduced from above the bath surface, a large proportion of the fine ore is consumed in the falling process, and the probability that the fine ore reaches the interface between the molten metal and the slag is low. for example,
It is accompanied by the exhaust gas rising in the furnace and cannot be efficiently added to the reaction zone. Further, when fine ore is blown from the bottom of the furnace through the bottom blowing tuyere, the charged fine ore may blow through together with the gas, making it impossible to obtain a sufficient residence time. Therefore, there is a limit to how much the addition efficiency can be affected by this bottom blowing. Furthermore, blowing through the bottom blowing tuyeres makes maintenance difficult.
この粉鉱石の添加に関する問題は、何も第４図に示した
ような上下分離型の溶融還元炉に限ったものではなく、
たとえば転炉型等の他の種々の形式の溶融還元炉に共通
するものである。This problem regarding the addition of fine ore is not limited to the upper and lower separated type smelting reduction furnace as shown in Figure 4.
For example, this is common to various other types of melting reduction furnaces such as the converter type.
そごで、本発明は、粉鉱石の装入形態に改良を加えるこ
とにより、粉鉱石を高い添加効率で装入し、しかも高い
還元速度が得ることを目的として開発されたものである
。Therefore, the present invention was developed with the aim of charging fine ore with high addition efficiency and obtaining a high reduction rate by improving the charging form of fine ore.
本発明の粉鉱石装入方法は、その目的を達成するため、
溶融金属とスラグとの界面反応を主として酸化物系鉱石
を溶融還元する際に、メタル浴の表面より下方に水平部
が形成された炉体側壁をもち、且つ炉底に底吹き羽口が
設けられた炉を用意し、ケーキ又はスラリー状にした粉
状の鉱石を前記水平部に設けた装入口゛から垂直下方に
向けてメタル浴に押し出すことを特徴とする。In order to achieve the purpose of the fine ore charging method of the present invention,
When melting and reducing oxide ores mainly through the interfacial reaction between molten metal and slag, the furnace has a side wall with a horizontal section formed below the surface of the metal bath, and a bottom blowing tuyere is provided at the bottom of the furnace. The method is characterized in that a powdered ore in the form of a cake or slurry is pushed vertically downward into a metal bath through a charging port provided in the horizontal section.
また、そのために使用する装置は、炉体の垂直側壁部に
連接して炉体の一部又は全周を取り巻く水平部を設け、
該水平部にケーキ又はスラリー状にした粉状の鉱石を収
容する容器の開孔に接続される装入口を形成し、前記ケ
ーキ又はスラリー状にした粉状鉱石をメタル浴に向けて
押し出す加圧装置を前記容器に付設したことを特徴とす
る。In addition, the device used for this purpose is provided with a horizontal part connected to the vertical side wall part of the furnace body and surrounding a part or the entire circumference of the furnace body,
A charging port is formed in the horizontal portion to be connected to an opening in a container containing powdered ore in the form of a cake or slurry, and pressure is applied to push the powdered ore in the form of a cake or slurry toward a metal bath. It is characterized in that a device is attached to the container.
なお、ここでいう粉鉱石とは、予備還元されたものを含
む意味で使用している。It should be noted that the term "fine ore" as used herein is used to include those that have been pre-reduced.
粉状の鉱石は、その比表面積が大きいことからスラグに
対する反応性が大きい、また、この粉状の鉱石として予
備還元したものを使用するとき、僅かの期間に還元され
て溶融金属浴に移行する。Powdered ore has a large specific surface area, so it is highly reactive to slag, and when pre-reduced powdered ore is used, it is reduced and transferred to the molten metal bath in a short period of time. .
しかし、通常の添加方法では、前述したように高い添加
効率が得られない。However, with the usual addition method, high addition efficiency cannot be obtained as described above.
そこで、本発明においては、この粉鉱石をケーキ又はス
ラリー状にし、これを炉体側壁に設けた水平部から垂直
下方に向けてメタル浴に押し出すことにより、粉鉱石の
装入を行っている。このケーキ又はスラリーは、わ〕鉱
石を油性の液体等と混練することにより簡単に得られる
。Therefore, in the present invention, the fine ore is charged by turning the fine ore into a cake or slurry and extruding it vertically downward from a horizontal section provided on the side wall of the furnace body into the metal bath. This cake or slurry can be easily obtained by kneading ore with an oily liquid or the like.
第１図は、このような装入の一例を示すものである。な
お、第１図の例は、第４図に示した上下分離型の溶融還
元炉の容器部２を中心として示している。しかし、本発
明は、これに拘束されるものではなく、転炉型等のその
他の形式の溶融還元炉に対しても適用できることは勿論
である。FIG. 1 shows an example of such charging. The example shown in FIG. 1 mainly shows the container section 2 of the upper and lower separated type melting reduction furnace shown in FIG. 4. However, the present invention is not limited to this, and can of course be applied to other types of melting reduction furnaces such as converter type.
容器部２の側壁の一部を水平部１４に形成し、該水平部
１４に垂直下方に指向する装入口１５を設けている。第
１図の例では、この水平部１４は、容器部２の側壁全周
にわたり形成している。しかし、容器部２の側壁を部分
的に内方に突出させ、そこに単数又は複数の水平部１４
を形成するようにしても良い。また、この水平部１４を
垂直側壁部Ｉ６に対して正確に直角に設けることに限ら
れるものではない。後述する装入口１５から押し出され
たケーキ状又はスラリー状粉鉱石の挙動がらして、水平
部１４と垂直側壁部１６とが作る角度は、９０〜１２０
度の範囲にあれば良い。そして、このような傾斜角度を
もつ水平部１４の壁に対して装入口１５を直角に設ける
とき、垂線に対する装入口１５の角度は０〜３０度とな
る。この角度をもって吹き込まれるわ）鉱石の方向を、
本願明細書で、実質的な意味において垂直下方という。A part of the side wall of the container part 2 is formed into a horizontal part 14, and the horizontal part 14 is provided with a charging port 15 oriented vertically downward. In the example shown in FIG. 1, the horizontal portion 14 is formed over the entire circumference of the side wall of the container portion 2. However, the side wall of the container part 2 may partially protrude inwardly, and one or more horizontal parts 14 may be formed therein.
may be formed. Further, the horizontal portion 14 is not limited to being provided exactly at right angles to the vertical side wall portion I6. Based on the behavior of cake-like or slurry-like fine ore extruded from the charging port 15, which will be described later, the angle formed by the horizontal portion 14 and the vertical side wall portion 16 is between 90 and 120.
It is good if it is within the range of degrees. When the charging port 15 is provided perpendicularly to the wall of the horizontal portion 14 having such an inclination angle, the angle of the charging port 15 with respect to the perpendicular is 0 to 30 degrees. (The direction of the ore is blown at this angle)
In this specification, it is referred to as vertically downward in a practical sense.
この水平部！４が炉体の内方に突出する距離は、装入口
１５から押し出されたケーキ状又はスラリー状粉鉱石が
直接垂直側壁部１６に接触しないように設定することが
好ましい。たとえば、容器部２の内径りを２００ＯＮと
し、炉底から水平部１４までの高さＨを１０００ｍｍと
するとき、水平部１４の長さしを３００■にとる。そし
て、装入口１５を、垂直側壁部１６の内側表面から２０
０．ｍのところに設ける。This horizontal part! It is preferable that the distance that 4 protrudes inward of the furnace body is set so that the cake-like or slurry-like fine ore extruded from the charging port 15 does not come into direct contact with the vertical side wall portion 16 . For example, when the inner diameter of the container part 2 is 200 ON and the height H from the hearth bottom to the horizontal part 14 is 1000 mm, the length of the horizontal part 14 is set to 300 mm. Then, the charging port 15 is opened 20 mm from the inner surface of the vertical side wall portion 16.
0. Installed at m.
この装入口１５に、す・−キ状又はスラリー状粉鉱石を
収容している容器１７の口部を接続する。そして、この
容器１７の後端を加圧装置１８により加圧する。これに
より、容器１７内のケーキ状又はスラリー状の粉鉱石は
、メタル浴８に向けて押し出される。なお、この押出し
に用いられる圧力を調整することにより、メタル浴８に
対するわ）鉱石の装入速度を制御することができる。This charging port 15 is connected to the mouth of a container 17 containing fine ore in the form of a skim or slurry. Then, the rear end of this container 17 is pressurized by a pressurizing device 18. As a result, the cake-like or slurry-like fine ore in the container 17 is pushed out toward the metal bath 8 . Note that by adjusting the pressure used for this extrusion, the rate at which ore is charged into the metal bath 8 can be controlled.
他方、炉底には、底吹き羽口１９が設けられている。第
１図ではこの底吹き羽口１９を二つ示しているが、この
設置個数は炉の容量に応して適宜定められる。また、底
吹き羽口１９の設置個所は、第１図に示した垂直断面で
みて、装入口１５を通る垂線の内側とする。この底吹き
羽口１９からは、チッソガス等のメタル浴８攪拌用のガ
スが吹き込まれるが、このガスにわ）鉱石、炭材等の材
料を随伴させても良い。On the other hand, a bottom blowing tuyere 19 is provided at the hearth bottom. Although two bottom blowing tuyeres 19 are shown in FIG. 1, the number of bottom blowing tuyeres 19 to be installed is determined as appropriate depending on the capacity of the furnace. Further, the installation location of the bottom blowing tuyere 19 is on the inside of the perpendicular line passing through the charging port 15 when viewed in the vertical cross section shown in FIG. A gas such as nitrogen gas for stirring the metal bath 8 is blown through the bottom blowing tuyere 19, but this gas may also be accompanied by materials such as ore and carbonaceous material.
ごの底吹き羽口１９からのガス吹込みにより、メタル浴
８に矢印Ａで示した循環流が生じる。この循環流Ａは、
水平部１４に当たり、その進行方向を曲げられて下降流
となる。この下降流に臨むように装入口１５を設けてい
るので、装入口１５先端にあるケーキ状又はスラリー状
粉鉱石は、下Ｂ？Ｍに削ぎ取られるようにしてメタル浴
８に装入される。By blowing gas through the bottom blowing tuyere 19 of the iron, a circulating flow shown by arrow A is generated in the metal bath 8. This circulating flow A is
When it hits the horizontal part 14, its traveling direction is bent and it becomes a downward flow. Since the charging port 15 is provided so as to face this downward flow, the cake-like or slurry-like fine ore at the tip of the charging port 15 is placed in the bottom B? It is charged into the metal bath 8 in such a manner that it is scraped off by M.
装入された粉鉱石は、循環流Ａが一旦下降して再度上昇
するまでの間、メタル浴８と接触しているので、メタル
浴８内における滞留時間は充分に長いものとなる。Since the charged fine ore is in contact with the metal bath 8 until the circulating flow A once descends and rises again, the residence time in the metal bath 8 is sufficiently long.
このため、装入された粉鉱石の歩留りは非常に高い。ま
た、ケーキ状又はスラリー状で装入された粉鉱石はメタ
ル浴８と接すると瞬間的に比表面積の大きな粉状となる
ことから、メタル浴８の含有炭素と迅速に反応し、金属
状態に還元される。For this reason, the yield of charged fine ore is very high. In addition, when the fine ore charged in the form of a cake or slurry comes into contact with the metal bath 8, it instantaneously becomes a powder with a large specific surface area, so it quickly reacts with the carbon contained in the metal bath 8 and becomes a metal state. will be returned.
したがって、反応速度も高いものとなる。Therefore, the reaction rate is also high.
また、わ）鉱石をケーキ状又はスラリー状にするために
使用した添加剤は、メタル浴８と接舷すると直ちにＣｏ
、、 Ｃｏ、 ８２等に分解してガス化する。In addition, (w) the additives used to make the ore into a cake or slurry form are immediately converted into Co
, Co, 82, etc. and gasify it.
このため、メタル浴８の攪拌が一層盛んに行われる、こ
の点でも、反応効率が向上される。Therefore, the metal bath 8 is more actively stirred, and the reaction efficiency is also improved in this respect.
なお、装入口１５を設ける個所を、メタル浴８の比較的
浅いところとすることが好ましい。このような個所に装
入口１５を設けるとき、装入口１５にかかるメタル浴８
のヘッドも小さなものとなる。このため、ケーキ状又は
スラリー状粉鉱石の押出しに必要な圧力を小さくするこ
とができ、且つ装入口１５のメンテナンスも容易なもの
となる。Note that it is preferable that the charging port 15 be provided at a relatively shallow portion of the metal bath 8. When the charging port 15 is provided in such a location, the metal bath 8 connected to the charging port 15 is
The head will also be small. Therefore, the pressure required for extruding the cake-like or slurry-like fine ore can be reduced, and maintenance of the charging port 15 can also be facilitated.
以下、実施例により本発明の特徴を具体的に説明する。 Hereinafter, the features of the present invention will be specifically explained with reference to Examples.
なお、本実施例において使用した溶融還元炉としては、
第１図において内径をＤ −２０００ｍｌ 。The melting reduction furnace used in this example is as follows:
In Figure 1, the inner diameter is D -2000ml.
炉底から水平部１４までの裔さをＨ−１０００ｍｍ、水
平部１４の長さをｌｌ−３００ｍ■、水平部１４と垂直
側壁部１６とが作る角度を直角とし、垂直側壁部１６の
内面から２００龍及び８００ Ｂの個所にそれぞれ装入
口１５及び底吹き羽口１９を設けた内容積３０トンの炉
を使用した。The length from the hearth bottom to the horizontal part 14 is H-1000 mm, the length of the horizontal part 14 is ll-300 m, the angle made by the horizontal part 14 and the vertical side wall part 16 is a right angle, and from the inner surface of the vertical side wall part 16 A furnace with an internal volume of 30 tons was used, which was provided with a charging port 15 and a bottom blowing tuyere 19 at 200 mm and 800 mm, respectively.
この炉に、ン容銑２０トン、フラックスとしてＣａＯ２
，７トン及びＳｉＯ□１．８トン並びにコークス１．２
トンを投入し、上吹き酸素６０００ Ｎ ＋ｖ？ ７時
及び底吹き酸素４０ＯＮｎ？／時の割合で炉内に酸素ガ
スを吹き込んだ。This furnace was equipped with 20 tons of pig iron and CaO2 as a flux.
, 7 tons and 1.8 tons of SiO□ and 1.2 tons of coke
ton of top-blown oxygen 6000 N +v? 7 o'clock and bottom blowing oxygen 40ONn? Oxygen gas was blown into the furnace at a rate of /hour.
また、水平部１４の合計１６個所に設けた装入口１５か
らそれぞれ、ケーキ状又はスラリー状粉鉱石を１５ｋｇ
／分の速度で押し込んだ。他方、炭材としてコークスを
８０ｋｇ／分の速度で投入した。In addition, 15 kg of cake-like or slurry-like powder ore is fed into each of the charging ports 15 provided at a total of 16 locations in the horizontal section 14.
Pushed in at a speed of /min. On the other hand, coke was fed as a carbon material at a rate of 80 kg/min.
製錬を１時間継続したところ、９トンの溶銑が得られた
。このときの鉱石歩留りは９９％であり、反応速度は１
００ｋｇ−Ｆｅ７分（χＴ、Ｆｅ）であった。このとき
の歩留り及び反応速度を、それぞれ第２図及び第３図に
示している。これらの図から明らかなように、本例によ
るとき、従来の装入方法に比較して、装入された粉鉱石
はほとんど反応に使用され、しかも反応速度も非常に高
いものであった。When smelting continued for one hour, 9 tons of hot metal was obtained. The ore yield at this time was 99%, and the reaction rate was 1
00kg-Fe7min (χT, Fe). The yield and reaction rate at this time are shown in FIGS. 2 and 3, respectively. As is clear from these figures, in this example, compared to the conventional charging method, almost all of the charged fine ore was used for the reaction, and the reaction rate was also very high.
以上に説明したように、本発明においては、ケーキ状又
はスラリー状にした粉鉱石を溶融金属の下降流に乗せて
メタル浴に装入することにより、粉鉱石をメタル浴内に
長い滞留時間で保持することができ、しかも反応性の裔
い粉状でメタル浴と接触反応させることができる。その
ため、歩留り良く優れた反応効率で粉鉱石を装入するこ
とが可能になった。したがって、本発明によるとき、溶
融還元を高い生産性で実施することができる。As explained above, in the present invention, by charging fine ore in the form of a cake or slurry into a metal bath on a downward flow of molten metal, the fine ore remains in the metal bath for a long time. Furthermore, it can be reacted with a metal bath in the form of a reactive powder. Therefore, it has become possible to charge fine ore with a high yield and excellent reaction efficiency. Therefore, according to the present invention, melt reduction can be carried out with high productivity.
第１図は本発明の実施例における粉鉱石の吹込み羽口を
備えた溶融還元炉の要部を示し、第２図及び第３図はそ
れぞれ粉鉱石の装入形態の相違に対応した歩留り及び反
応速度をを示す。また、第４図は、本発明者等が先に開
発した溶融還元炉を示す。Fig. 1 shows the main parts of a smelting reduction furnace equipped with a fine ore injection tuyere in an embodiment of the present invention, and Figs. 2 and 3 show yields corresponding to different charging forms of fine ore, respectively. and the reaction rate. Moreover, FIG. 4 shows a melting reduction furnace that was previously developed by the present inventors.
Claims (1)
鉱石を溶融還元する際に、メタル浴の表面より下方に水
平部が形成された炉体側壁をもち、且つ炉底に底吹き羽
口が設けられた炉を用意し、ケーキ又はスラリー状にし
た粉状の鉱石を前記水平部に設けた装入口から垂直下方
に向けてメタル浴に押し出すことを特徴とする溶融還元
炉への粉鉱石装入方法。 ２、炉体の垂直側壁部に連接して炉体の一部又は全周を
取り巻く水平部を設け、該水平部にケーキ又はスラリー
状にした粉状の鉱石を収容する容器の開孔に接続される
装入口を形成し、前記ケーキ又はスラリー状にした粉状
鉱石をメタル浴に向けて押し出す加圧装置を前記容器に
付設したことを特徴とする溶融還元炉への粉鉱石装入装
置。[Claims] 1. A furnace having a side wall of a furnace body with a horizontal portion formed below the surface of a metal bath when smelting and reducing oxide ore mainly through an interfacial reaction between molten metal and slag; A melting method characterized in that a furnace is provided with a bottom-blowing tuyere at the bottom, and powdered ore in the form of a cake or slurry is extruded vertically downward into a metal bath through a charging port provided in the horizontal section. How to charge fine ore into a reduction furnace. 2. A horizontal part is provided that is connected to the vertical side wall of the furnace body and surrounds a part or the entire circumference of the furnace body, and the horizontal part is connected to the opening of the container that houses the powdered ore in the form of a cake or slurry. A device for charging powdered ore into a smelting reduction furnace, characterized in that a pressurizing device is attached to the container to form a charging port in which the powdered ore is formed into a cake or slurry and push the powdered ore into a metal bath.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18137186A JPS6335730A (en) | 1986-07-31 | 1986-07-31 | Method and device for charging powder ore to smelting and reducing furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18137186A JPS6335730A (en) | 1986-07-31 | 1986-07-31 | Method and device for charging powder ore to smelting and reducing furnace |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6335730A true JPS6335730A (en) | 1988-02-16 |
Family
ID=16099556
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18137186A Pending JPS6335730A (en) | 1986-07-31 | 1986-07-31 | Method and device for charging powder ore to smelting and reducing furnace |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6335730A (en) |
-
1986
- 1986-07-31 JP JP18137186A patent/JPS6335730A/en active Pending
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