JPH01168806A - Production of chromium-contained molten iron - Google Patents
Production of chromium-contained molten ironInfo
- Publication number
- JPH01168806A JPH01168806A JP32544687A JP32544687A JPH01168806A JP H01168806 A JPH01168806 A JP H01168806A JP 32544687 A JP32544687 A JP 32544687A JP 32544687 A JP32544687 A JP 32544687A JP H01168806 A JPH01168806 A JP H01168806A
- Authority
- JP
- Japan
- Prior art keywords
- chromium
- molten iron
- reduction
- furnace
- chromium oxide
- 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
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 46
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 23
- 238000004519 manufacturing process Methods 0.000 title claims description 5
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 claims abstract description 32
- 229910000423 chromium oxide Inorganic materials 0.000 claims abstract description 32
- 239000011651 chromium Substances 0.000 claims abstract description 29
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims abstract description 25
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 25
- 238000007664 blowing Methods 0.000 claims abstract description 21
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 17
- 239000000956 alloy Substances 0.000 claims abstract description 17
- 229910017082 Fe-Si Inorganic materials 0.000 claims abstract description 11
- 229910017133 Fe—Si Inorganic materials 0.000 claims abstract description 11
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000001301 oxygen Substances 0.000 claims abstract description 9
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 9
- 230000004907 flux Effects 0.000 claims abstract description 8
- 238000003756 stirring Methods 0.000 claims abstract description 6
- 239000011343 solid material Substances 0.000 claims abstract description 4
- 238000002844 melting Methods 0.000 claims description 11
- 230000008018 melting Effects 0.000 claims description 11
- 239000003575 carbonaceous material Substances 0.000 claims description 8
- 239000000126 substance Substances 0.000 claims description 7
- 238000000034 method Methods 0.000 abstract description 18
- 238000003723 Smelting Methods 0.000 abstract description 16
- 239000000463 material Substances 0.000 abstract description 10
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 abstract description 3
- 239000003795 chemical substances by application Substances 0.000 abstract 1
- 229910001873 dinitrogen Inorganic materials 0.000 abstract 1
- 238000006722 reduction reaction Methods 0.000 abstract 1
- 239000002893 slag Substances 0.000 description 19
- 239000007789 gas Substances 0.000 description 7
- 230000001603 reducing effect Effects 0.000 description 7
- 229910000676 Si alloy Inorganic materials 0.000 description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 5
- 229910052799 carbon Inorganic materials 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 239000007787 solid Substances 0.000 description 5
- 229910000604 Ferrochrome Inorganic materials 0.000 description 4
- 239000000571 coke Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- 239000003638 chemical reducing agent Substances 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 238000007670 refining Methods 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 229910052814 silicon oxide Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 235000018185 Betula X alpestris Nutrition 0.000 description 1
- 235000018212 Betula X uliginosa Nutrition 0.000 description 1
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002090 carbon oxide Inorganic materials 0.000 description 1
- 239000012159 carrier gas Substances 0.000 description 1
- 239000002801 charged material Substances 0.000 description 1
- UPHIPHFJVNKLMR-UHFFFAOYSA-N chromium iron Chemical compound [Cr].[Fe] UPHIPHFJVNKLMR-UHFFFAOYSA-N 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 239000010436 fluorite Substances 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- HEQBUZNAOJCRSL-UHFFFAOYSA-N iron(ii) chromite Chemical compound [O-2].[O-2].[O-2].[Cr+3].[Fe+3] HEQBUZNAOJCRSL-UHFFFAOYSA-N 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 239000002923 metal particle Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/0006—Making spongy iron or liquid steel, by direct processes obtaining iron or steel in a molten state
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- 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、固体のクロム酸化物含有物質をクロム源とし
て使用し、これを炉内で溶融還元することによりステン
レス粗溶湯などの含クロム溶鉄を製造する方法に関する
。[Detailed Description of the Invention] [Industrial Application Field] The present invention uses a solid chromium oxide-containing substance as a chromium source and melts and reduces it in a furnace to produce chromium-containing molten iron such as crude molten stainless steel. Relating to a method of manufacturing.
従来、ステンレス鋼製造用の含クロム溶鉄の製造には、
電気炉にクロム源、スクラップ、フラックスおよび必要
に応じ副原料やコークスを装入して溶解する方法がとら
れてきた。その際、クロム源としては高炭素フエロクロ
ムが使用されるのが通常であり、この高炭素フエロクロ
ムを製造するにも電気炉を使用している。したがって、
多量の電力消費を必要とすることから、近年、溶融還元
炉を用いてクロム鉱石或いはその半還元物等のクロム酸
化物含有物質をコークス等の炭材により直接的に溶融還
元する方法が提案されている。Conventionally, in the production of chromium-containing molten iron for stainless steel production,
A method has been adopted in which a chromium source, scrap, flux, and if necessary auxiliary raw materials and coke are charged into an electric furnace and melted. In this case, high carbon ferrochrome is usually used as the chromium source, and an electric furnace is also used to produce this high carbon ferrochrome. therefore,
Since it requires a large amount of electricity consumption, in recent years a method has been proposed in which chromium oxide-containing substances, such as chromium ore or its half-reduced products, are directly smelted and reduced with carbonaceous material such as coke using a smelting reduction furnace. ing.
例えば鉄と鋼’８５−３９２８には、上底吹き転炉に溶
銑を装入したうえ、炉上からコークス、クロム鉱石、造
滓材を連続供給し、底吹Ｎ２撹拌しなから上吹ランスか
ら送酸してクロム鉱石を溶融還元する方法が記載されて
いる。For example, in Tetsu-to-Hagane '85-3928, hot metal was charged into a top-bottom blowing converter, and coke, chromium ore, and slag forming material were continuously supplied from the top of the furnace. A method is described in which chromium ore is melted and reduced by sending acid from it.
また特開昭６１−６９９４４号公報は、上底吹き反応容
器に、溶鉄、予備還元クロム鉱石、炭材を装入し酸素を
供給してフェロクロムに溶融還元する方法を開示してお
り、そのさい、スラグ中の酸化物含有量の実質止金てが
還元されてからＳｔ金合金スラグ上から装入して溶融す
ると、スラグ中のフェロクロムは金属浴中に移行させる
ことができると教示している。Furthermore, JP-A No. 61-69944 discloses a method in which molten iron, pre-reduced chromium ore, and carbonaceous material are charged into a top-bottom blowing reaction vessel and melted and reduced to ferrochrome by supplying oxygen. teaches that the ferrochrome in the slag can be transferred into the metal bath when the slag is charged from above and melted after the oxide content in the slag has been substantially reduced. .
特開昭６２−８０２１４号公報は、上底吹き転炉等の溶
融還元炉において、金属浴面より上でスラグ面より下に
設けた羽口からＣＯガスまたはＮ２ガスをキャリヤーガ
スとしてコークス粉またはＦｅ−５ｉ粉を吹込むことに
よって、クロム酸化物の還元を行なう方法を開示する。JP-A-62-80214 discloses that in a melting reduction furnace such as a top-bottom blowing converter, coke powder or A method for reducing chromium oxide by injecting Fe-5i powder is disclosed.
一般に、これまでの溶融還元法では、クロム酸化物の還
元は、スラグ中に懸濁している炭材または溶鉄中の炭素
に依存するものであった。そのため還元速度が一般に遅
く、スラグ中のクロム分を溶鉄中に歩留りよく回収する
ためには９例えば前掲の鉄と鋼’ ８７−５９２８に示
されるように、クロム酸化鉄物含有物質の投入完了後も
送酸と撹拌をかなり長時間実施せねばならず処理時間を
長く必要とした。Generally, in conventional smelting reduction methods, the reduction of chromium oxide has relied on carbonaceous material suspended in slag or carbon in molten iron. Therefore, the reduction rate is generally slow, and in order to recover the chromium content in slag into molten iron with a high yield, it is necessary to complete the addition of chromium iron oxide-containing substances, as shown in 9, for example, the above-mentioned Iron and Steel '87-5928. In addition, acid feeding and stirring had to be carried out for a considerable period of time, requiring a long processing time.
また、還元剤としてＰｅ−５ｉ粉を使用することが前記
特開昭６２−８０２１４号公報に提案されているが。Further, the use of Pe-5i powder as a reducing agent is proposed in the above-mentioned Japanese Patent Application Laid-Open No. 62-80214.
この場合には、 Ｆｅ−５ｉ粉を羽口からスラグ中にＣ
ＯやＮ２をキャリヤーガスとしてインジェクシヨンする
ものであるから、精錬装置の装置構成が複雑になること
は否めない。In this case, Fe-5i powder is introduced into the slag from the tuyere.
Since O or N2 is injected as a carrier gas, it is undeniable that the configuration of the refining equipment becomes complicated.
特開昭６１−６９９４４号公報はＳｉ合金の添加を開示
するが、この場合にはスラグ中のクロム酸化物含有量が
１％以下になった時点、つまり還元が実質上終了したあ
とにＳｉ合金を添加するものである。JP-A-61-69944 discloses the addition of a Si alloy, but in this case, the Si alloy is added when the chromium oxide content in the slag becomes 1% or less, that is, after the reduction is substantially completed. is added.
したがって、このＳｉ合金は還元速度の向上には寄与し
ないと考えられる。Therefore, it is considered that this Si alloy does not contribute to improving the reduction rate.
本発明は、上底吹き可能な反応容器を用いて固体のクロ
ム酸化物を溶融還元するさいにＦ ｅ−Ｓ ｉを用いて
高い還元速度のもとて操業性よく溶融還元を行なうこと
を目的としたものである。The purpose of the present invention is to melt and reduce solid chromium oxide using Fe-Si at a high reduction rate and with good operability when melting and reducing solid chromium oxide using a top-bottom blown reaction vessel. That is.
〔問題点を解決するための手段］
前記の目的を達成せんとする本発明の要旨とするところ
は、上底吹き可能な反応容器に溶鉄を装入し、炉上より
クロム酸化物含有物質、炭材およびフラックスからなる
固体材料を装入し、底吹き撹拌を行いながら上吹きラン
スから送酸してクロム酸化物の溶融と還元を行うさいに
、この溶融還元の操作前または途中にＦ ｅ−Ｓ ｉ合
金を炉上より供給することを特徴とする。[Means for Solving the Problems] The gist of the present invention, which aims to achieve the above-mentioned object, is to charge molten iron into a top-bottom blown reaction vessel, and to charge a chromium oxide-containing material from above the furnace. When charging a solid material consisting of carbonaceous material and flux and melting and reducing chromium oxide by sending oxygen from a top-blowing lance while performing bottom-blowing stirring, F e is added before or during the melt-reduction operation. -Si alloy is supplied from above the furnace.
すなわち本発明は、溶融還元炉の上部より装入するクロ
ム酸化物含有物質、炭材およびフラックスからなる固体
材料の炉上装入物として、これらに加えてＦ ｅ−Ｓ
ｉ合金を含ませるのであり、このＦｅ−３ｉ合金中のＳ
ｒを溶融還元期における還元剤として機能させるもので
ある。本発明者らは溶融還元期の材料である該炉上装入
物にＦ ｅ−Ｓ ｉ合金を合わせて供給すると、クロム
酸化物の還元速度が著しく上昇しまたスラグ中のクロム
分の回収歩留を向上させることができることを見出し１
本発明法の場合には、溶融還元期に引き続く仕上げ還元
期を特別に設けなくても、高いＣｒ歩留りで且つ短時間
の精錬時間で含クロム溶鉄を製造することができること
がわかった。従来のクロム酸化物の溶融還元法は溶融還
元期とこれに引き続く仕上げ還元期とからなるものであ
り、仕上げ還元期では装入物質のうち少なくともクロム
酸化物含有物質の供給を止めたうえ−で、溶融還元期と
同様の操作を行ってスラグ中に残存するクロム酸化物の
還元を行なうことがクロム歩留り向上の点から必要とし
ていたのであるが１本発明法によると、この仕上げ還元
期の時間を大幅に短縮しても、また場合によっては仕上
げ還元期を特別に設けなくても、高いクロム歩留りが達
成でき９全体としての処理時間は大幅に短縮できる。That is, the present invention provides a furnace charge of a solid material consisting of a chromium oxide-containing substance, a carbonaceous material, and a flux, which is charged from the upper part of a smelting reduction furnace.
i alloy, and S in this Fe-3i alloy
This allows r to function as a reducing agent during the melting reduction period. The present inventors have found that when Fe-Si alloy is supplied together with the furnace charge, which is the material in the smelting reduction stage, the reduction rate of chromium oxide increases significantly, and the recovery rate of chromium in the slag increases. Finding 1 that it can improve retention
In the case of the method of the present invention, it has been found that chromium-containing molten iron can be produced with a high Cr yield and in a short refining time without the need to specifically provide a final reduction period following the smelting reduction period. The conventional smelting reduction method for chromium oxide consists of a smelting reduction period and a finishing reduction period that follows this, and in the finishing reduction period, the supply of at least the chromium oxide-containing material among the charged materials is stopped, and then In order to improve the chromium yield, it was necessary to reduce the chromium oxide remaining in the slag by performing the same operation as in the smelting reduction period, but according to the method of the present invention, the time of this final reduction period can be reduced. A high chromium yield can be achieved even if the process time is significantly shortened, or even without a special finishing reduction period in some cases, and the overall processing time can be significantly shortened.
第１図に本発明法の実施に適する溶融還元炉を示した。FIG. 1 shows a melting reduction furnace suitable for carrying out the method of the present invention.
この炉は、筒型反応容器１の炉底に羽口２を設け、炉頂
の開口３から上吹きランス４を挿入するようにした上底
吹き可能な精錬容器であり。This furnace is a refining vessel capable of top and bottom blowing, in which a tuyere 2 is provided at the bottom of a cylindrical reaction vessel 1, and a top blowing lance 4 is inserted through an opening 3 at the top of the furnace.
炉頂の開口３から固体装入物を投入できるように。Solid charge can now be introduced through opening 3 at the top of the furnace.
炉上部にバンカー６が設けられている。７は排気フード
を示す、また、８は炉内の溶鉄層を、９はその上のスラ
グ層を示す。A bunker 6 is provided at the top of the furnace. 7 indicates an exhaust hood, 8 indicates a molten iron layer in the furnace, and 9 indicates a slag layer above it.
この炉の操業は、炉底の羽口２から撹拌用ガスを吹き込
みなから溶鉄を反応容器１に装入し、バンカー６からク
ロム酸化物含有物質、炭材およびフラックスを供給した
うえまたは供給しながら。This furnace is operated by first blowing stirring gas through the tuyere 2 at the bottom of the furnace, then charging molten iron into the reaction vessel 1, and supplying or supplying a chromium oxide-containing material, carbonaceous material, and flux from the bunker 6. While.
ランス４から送酸することによって行われるが。This is done by sending oxygen from lance 4.
本発明法においては、最初の溶融還元期の始まる前また
は途中においてバンカー６からＦ ｅ−Ｓ ｉ合金を装
入し、−または装入しつづけ、これを溶融することによ
って、溶鉄中にＳｉを溶解し、この金属浴中のＳｉを還
元剤としてクロム酸化物の還元を行わせ、また次の仕上
還元期、つまりクロム酸化物は新たに炉内に投入せずに
スラグ中に残留するクロム酸化物を還元する段階を行な
う場合には残留するＳｉによって残留クロム酸化物の還
元を助成するのである。Ｆｅ−３ｔ合金のバンカー６か
らの投入は、溶融還元期の操業中において連続的に投入
してもよいし１回分式に時間を置きながら投入を続ける
方式で投入してもよい。In the method of the present invention, Si is introduced into the molten iron by charging or continuing to charge Fe-Si alloy from the bunker 6 before or during the first smelting reduction period and melting it. The Si in the metal bath is used as a reducing agent to reduce the chromium oxide, and in the next final reduction period, the chromium oxide is not added to the furnace and the chromium oxide remaining in the slag is reduced. When performing the step of reducing chromium oxide, the remaining Si assists in reducing the remaining chromium oxide. The Fe-3t alloy may be fed from the bunker 6 continuously during the operation during the melting and reduction period, or may be fed in one batch at a time interval.
このようにして、溶融還元期にクロム酸化物含有物質等
の供給物とともにＦ ｅ−Ｓ ｉ合金を供給すると、溶
鉄中に溶解したシリコンによってクロム酸化物が良好に
還元される。これは、クロム酸化物を還元する能力は炭
素よりもシリコンの方が大きいことによる。またスラグ
層中で溶融したＦｅ−Ｓｉ合金は、シリコンとクロム酸
化物の反応に加えて、スラグ中に懸濁しているメタル粒
を捕捉回収する。これによって、クロム酸化物の還元速
度およびスラグ中のクロム分の回収歩留の両者を上昇さ
せることができ、処理時間を大幅に短縮することができ
る。Ｆｅ−Ｓｉ合金の投入そのものはコストアップに繋
がるが処理時間の低減効果が著しいので、適切なＦ ｅ
−Ｓ ＋合金の添加量では総合的に見てコストダウンと
なる。Ｆｅ−Ｓｉ合金の投入量は限定的ではないが供給
するクロム分に対して約５％〜４５％が適当である。そ
れ以上に供給してもコストに見あう還元速度の向上は得
られず、また５％より少なくても還元速度の改善に効果
が小さい。In this way, when the Fe-S i alloy is supplied together with supplies such as a chromium oxide-containing substance during the smelting and reduction period, the chromium oxide is effectively reduced by the silicon dissolved in the molten iron. This is because silicon has a greater ability to reduce chromium oxide than carbon. Further, the Fe-Si alloy melted in the slag layer not only reacts with silicon and chromium oxide, but also captures and recovers metal particles suspended in the slag. As a result, both the reduction rate of chromium oxide and the recovery yield of chromium in the slag can be increased, and the processing time can be significantly shortened. Although the introduction of Fe-Si alloy itself leads to an increase in cost, it has a remarkable effect of reducing processing time, so it is necessary to
The amount of addition of -S + alloy results in a cost reduction overall. Although the amount of Fe--Si alloy to be added is not limited, it is appropriate to range from about 5% to 45% based on the chromium content to be supplied. Even if it is supplied in excess of this amount, an improvement in the reduction rate commensurate with the cost cannot be obtained, and if it is less than 5%, the effect of improving the reduction rate is small.
本発明法における反応容器中に溶融還元処理を行う前に
入れる溶鉄には、２％以上のＣおよび３９％までのＣｒ
を含む鉄あるいは鉄−クロム系溶湯を用いて行なうのが
よく、必要に応じてＮｉ等の他の成分を含有してもよい
、また、前ヒートの一部を残湯として利用してもよい、
バンカーより炉内に投入するクロム酸化物含有物質とし
ては、クロム鉱石、未還元または半還元クロムペレット
。In the method of the present invention, the molten iron introduced into the reaction vessel before the smelting reduction treatment contains at least 2% C and up to 39% Cr.
It is preferable to use iron or iron-chromium-based molten metal containing Ni, and if necessary, other components such as Ni may be included. Also, a part of the previous heat may be used as residual metal. ,
The chromium oxide-containing materials introduced into the furnace from the bunker include chromium ore and unreduced or semi-reduced chromium pellets.
クロム焼結鉱などを使用することができ、フラックスと
しては、該クロム酸化物含有物質のスラグへの溶融を促
進するためにＣａＯ，珪砂等のＳ ｉ Ｏｚ源、蛍石等
のＣａ Ｆ ｚ等が使用される。炭材はコークスの使用
が一般的である。上吹きランスからは酸素または酸素混
合ガスを供給し、炉底の羽口からは、窒素、アルゴン、
−酸化炭素、二酸化炭素、炭化水素ガス等のガスを供給
する。場合によっては炉底の羽口から酸素含有ガスを供
給することもできる。また１反応容器の側壁に横吹き羽
口を設けて、これから同様のガスを吹き込んでもよい、
さらに固体の装入原料を炉上からその全部を装入するの
ではなく、その一部を粉体としてこれを炉底の羽口、上
吹きランス或いは横吹き羽口からガスと共にインジェク
ションする溶融還元法の場合にも本発明によるＦ ｅ−
Ｓ ｉ合金の炉上からの投入操業とその効果を享受する
ことができる。Sintered chromium ore or the like can be used, and fluxes include CaO, a SiOz source such as silica sand, CaFz such as fluorite, etc., in order to promote the melting of the chromium oxide-containing substance into slag. is used. Coke is commonly used as the carbon material. Oxygen or oxygen mixed gas is supplied from the top blowing lance, and nitrogen, argon,
- Supplying gases such as carbon oxide, carbon dioxide, hydrocarbon gases, etc. In some cases, oxygen-containing gas can also be supplied through tuyeres at the bottom of the furnace. Alternatively, a side blowing tuyere may be provided on the side wall of one reaction vessel, and the same gas may be blown from there.
Furthermore, instead of charging all of the solid raw material from the top of the furnace, a part of it is turned into powder and is injected together with gas from the tuyere at the bottom of the furnace, top-blowing lance, or side-blowing tuyere. Also in the case of the F e-
It is possible to enjoy the operation of charging Si alloy from above the furnace and its effects.
第１図に示す構造の０．５トンの上底吹き可能な反応容
器を用いて、第１〜３表に示す成分のクロム鉱石の半還
元ペレット、Ｆｅ−３ｔ合金、コークスを使用して、第
４表に示す処理条件にて溶融還元を行った場合の、処理
中におけるスラグ中のクロム％（χＴ、Ｃｒ）の推移を
、溶融還元期にＦ ｅ−Ｓ ｉ合金を投入しなかった場
合と比較して第２図に示した。実施例では供給するクロ
ム分に対して３７％のＦ ｅ−Ｓ ｉ合金を供給し、比
較例ではＦ ｅ−Ｓ ｉ合金を供給しない。Using a 0.5 ton top-bottom blown reaction vessel having the structure shown in FIG. The changes in chromium% (χT, Cr) in the slag during the treatment when melting reduction is carried out under the processing conditions shown in Table 4, and when no Fe-Si alloy is added during the melting reduction period. A comparison is shown in Figure 2. In the example, 37% of Fe-Si alloy was supplied with respect to the supplied chromium content, and in the comparative example, no Fe-Si alloy was supplied.
第２図より明らかな樺にこの発明法によれば溶融還元期
に、Ｆｅ−３ｉ合金を供給することによって、溶融還元
終了時に、スラグ中の（χＴ、（：ｒ） −１，０％に
到達し、処理時間を大幅に短縮することができる。尚、
工業的にはスラグ中の（χＴ、Ｃｒ）５１％で処理終了
とみなされる。したがって、特に仕上げ還元期を設けな
くても、装入されたクロム酸化物は十分に還元すること
ができる。According to this invention method, Fe-3i alloy is supplied to birch during the smelting and reduction period as shown in Fig. 2. can be achieved and the processing time can be significantly shortened.In addition,
Industrially, the treatment is considered complete when (χT, Cr) in the slag is 51%. Therefore, the charged chromium oxide can be sufficiently reduced even without providing a final reduction period.
以上説明した様に２本発明法によると、クロム酸化物の
還元速度および溶鉄へのクロム分の回収率を上昇させ得
ることにより、処理時間を大幅に短縮できるから、既存
のプロセス例えばステンレス製鋼工程に溶融還元法を採
り入れることが容易となり且つ耐火物溶損の低減効果が
奏され耐火物コストが安くなるとともに反応容器の稼動
率向上も図られる。As explained above, according to the method of the present invention, the reduction rate of chromium oxide and the recovery rate of chromium to molten iron can be increased, and the processing time can be significantly shortened. It becomes easy to adopt the smelting reduction method, and the effect of reducing the erosion of the refractory is exhibited, the cost of the refractory is reduced, and the operating rate of the reaction vessel is also improved.
第１図はこの発明を実施するに通した装置例を示す略断
面図、第２図は本発明を実施したさいのスラグ中の（χ
Ｔ、Ｃｒ）の推移を、比較例と対比して示した図である
。
ｌ・・反応容器、 ２・・炉底の羽口、 ３・・炉
頂開口、 ４・・上吹きランス、 ６・・バンガー
、 ７・・フード、 ８・・溶鉄層１．９・・スラ
グ層。FIG. 1 is a schematic sectional view showing an example of an apparatus for carrying out the present invention, and FIG.
FIG. 3 is a diagram showing the changes in T, Cr) in comparison with a comparative example. 1. Reaction vessel, 2. Tuyere at the bottom of the furnace, 3. Furnace top opening, 4. Top blowing lance, 6. Banger, 7. Hood, 8. Molten iron layer 1. 9. Slag layer.
Claims (1)
ム酸化物含有物質、炭材およびフラックスからなる固体
材料を装入し、底吹き撹拌を行いながら上吹きランスか
ら送酸してクロム酸化物の溶融と還元を行うさいに、こ
の溶融還元の操作前または途中にＦｅ−Ｓｉ合金を炉上
より供給することを特徴とする含クロム溶鉄の製造法。Molten iron is charged into a reaction vessel capable of top-bottom blowing, solid materials consisting of chromium oxide-containing substances, carbonaceous materials, and flux are charged from the top of the furnace, and oxygen is fed from a top-blowing lance while bottom-blowing stirring is performed. A method for producing chromium-containing molten iron, which comprises supplying an Fe-Si alloy from above the furnace before or during the melting and reduction operation when chromium oxide is melted and reduced.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32544687A JPH01168806A (en) | 1987-12-24 | 1987-12-24 | Production of chromium-contained molten iron |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32544687A JPH01168806A (en) | 1987-12-24 | 1987-12-24 | Production of chromium-contained molten iron |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01168806A true JPH01168806A (en) | 1989-07-04 |
Family
ID=18176950
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP32544687A Pending JPH01168806A (en) | 1987-12-24 | 1987-12-24 | Production of chromium-contained molten iron |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01168806A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3543634B1 (en) * | 2018-03-23 | 2023-05-24 | Air Products and Chemicals, Inc. | Oxy-fuel combustion system for melting a pelleted charge material |
-
1987
- 1987-12-24 JP JP32544687A patent/JPH01168806A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3543634B1 (en) * | 2018-03-23 | 2023-05-24 | Air Products and Chemicals, Inc. | Oxy-fuel combustion system for melting a pelleted charge material |
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