JPS62167809A - Production of molten chromium iron - Google Patents
Production of molten chromium ironInfo
- Publication number
- JPS62167809A JPS62167809A JP61009586A JP958686A JPS62167809A JP S62167809 A JPS62167809 A JP S62167809A JP 61009586 A JP61009586 A JP 61009586A JP 958686 A JP958686 A JP 958686A JP S62167809 A JPS62167809 A JP S62167809A
- Authority
- JP
- Japan
- Prior art keywords
- slag
- chromium
- ore
- furnace
- chromium ore
- 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
- 238000004519 manufacturing process Methods 0.000 title claims description 6
- UPHIPHFJVNKLMR-UHFFFAOYSA-N chromium iron Chemical compound [Cr].[Fe] UPHIPHFJVNKLMR-UHFFFAOYSA-N 0.000 title abstract 2
- 239000002893 slag Substances 0.000 claims abstract description 64
- 238000009628 steelmaking Methods 0.000 claims abstract description 34
- 239000000843 powder Substances 0.000 claims abstract description 23
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 16
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 16
- 239000001301 oxygen Substances 0.000 claims abstract description 16
- 238000002844 melting Methods 0.000 claims abstract description 14
- 230000008018 melting Effects 0.000 claims abstract description 14
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000002994 raw material Substances 0.000 claims abstract description 10
- 229910052742 iron Inorganic materials 0.000 claims abstract description 6
- 238000010298 pulverizing process Methods 0.000 claims abstract description 3
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 102
- 239000011651 chromium Substances 0.000 claims description 102
- 229910052804 chromium Inorganic materials 0.000 claims description 102
- 239000000463 material Substances 0.000 claims description 28
- 238000000034 method Methods 0.000 claims description 18
- 229910052751 metal Inorganic materials 0.000 claims description 15
- 239000002184 metal Substances 0.000 claims description 15
- 239000003575 carbonaceous material Substances 0.000 claims description 5
- 239000000571 coke Substances 0.000 abstract description 9
- 229910052799 carbon Inorganic materials 0.000 abstract description 6
- 239000000203 mixture Substances 0.000 abstract description 6
- 229910001220 stainless steel Inorganic materials 0.000 abstract description 6
- 239000010935 stainless steel Substances 0.000 abstract description 6
- 229910000831 Steel Inorganic materials 0.000 abstract description 5
- 239000010959 steel Substances 0.000 abstract description 5
- 238000007664 blowing Methods 0.000 abstract description 4
- 239000000155 melt Substances 0.000 abstract description 2
- 239000003795 chemical substances by application Substances 0.000 abstract 3
- 235000008733 Citrus aurantifolia Nutrition 0.000 abstract 1
- 229910017060 Fe Cr Inorganic materials 0.000 abstract 1
- 229910002544 Fe-Cr Inorganic materials 0.000 abstract 1
- 235000011941 Tilia x europaea Nutrition 0.000 abstract 1
- 239000004571 lime Substances 0.000 abstract 1
- 238000007670 refining Methods 0.000 abstract 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 18
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 12
- 238000006722 reduction reaction Methods 0.000 description 7
- 229910000604 Ferrochrome Inorganic materials 0.000 description 6
- 239000000292 calcium oxide Substances 0.000 description 6
- 235000012255 calcium oxide Nutrition 0.000 description 6
- 239000004576 sand Substances 0.000 description 6
- 239000000377 silicon dioxide Substances 0.000 description 6
- 238000003723 Smelting Methods 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 description 4
- 229910000423 chromium oxide Inorganic materials 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 3
- 239000012159 carrier gas Substances 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000004090 dissolution Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910000519 Ferrosilicon Inorganic materials 0.000 description 1
- 235000019738 Limestone Nutrition 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 150000001844 chromium Chemical class 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000010436 fluorite Substances 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 238000012360 testing method Methods 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
- C21B13/0026—Making spongy iron or liquid steel, by direct processes obtaining iron or steel in a molten state introduction of iron oxide in the flame of a burner or a hot gas stream
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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、電力を製錬用のエネルギーとして使用するこ
となく１そして、クロム源としてクロム鉱石の使用を可
能にした経済的な含クロム溶銑の製造法に関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention provides an economical chromium-containing hot metal that makes it possible to use chromium ore as a chromium source without using electricity as energy for smelting. Concerning the manufacturing method.
従来より、ステンレス鋼製造用の含クロム溶銑の製造法
としては、電気炉による方法が一つの技術体系を形成し
ている。この方法は、製鋼用アーク炉に、クロム源１
コークス、フラックスおよび必要に応じて副材料を装入
して溶解し、含クロム溶銑を得るものである。そのさい
のクロム源としては、高炭素フェロクロムが使用される
のが通常である。この高炭素フェロクロムを製造するの
にも電気炉が使用され、この場合にはクロム鉱石の半還
元ペレット等が使用されたり焼結鉱が使用されたりする
。この従来法によると電力消費量が非常に大きいので、
近年、クロム鉱石を炭材等の還元材によって直接的に溶
融還元する方法の開発が進運されている。その傾向とし
ては、転炉によってクロム鉱石の溶融還元を行う方向に
注力されているようである０例えば特開昭５８−７７５
４８号公報。BACKGROUND ART Conventionally, as a method for producing chromium-containing hot metal for producing stainless steel, a method using an electric furnace has formed one technological system. In this method, a chromium source is added to a steelmaking arc furnace.
Coke, flux, and auxiliary materials as necessary are charged and melted to obtain chromium-containing hot metal. High carbon ferrochrome is usually used as the chromium source. An electric furnace is also used to produce this high carbon ferrochrome, and in this case semi-reduced pellets of chromium ore or sintered ore are used. This conventional method consumes a lot of electricity, so
In recent years, progress has been made in the development of a method for directly melting and reducing chromium ore using a reducing agent such as carbonaceous material. The trend seems to be to focus on smelting and reducing chromium ore using a converter.
Publication No. 48.
特開昭５９−１４５７５８号公報、特開昭５９−１５０
０５９号公報、特開昭５９−１５００６０号公報、特開
昭５９−１５００６１号公報、特開昭５９−１５００６
２号公報等は転炉によるクロム鉱石の溶融還元を開示し
ている。また特開昭５０−１１６３１７号公報は特殊な
混合槽を使用してクロム鉱石の溶融還元を行う方法を開
示する。JP-A-59-145758, JP-A-59-150
059, JP 59-150060, JP 59-150061, JP 59-15006
Publication No. 2 and others disclose melting and reduction of chromium ore using a converter. Further, Japanese Patent Application Laid-Open No. 116317/1983 discloses a method for melting and reducing chromium ore using a special mixing tank.
一方１本願と同一出願人に係る特願昭５９−１８２１９
号（特開昭６０−１６２７１８号公報）において、特殊
な竪型炉を使用し、この竪型炉の羽口にクロム源の一部
としての粉状のクロム鉱石を吹込むことによってその溶
融還元を図る方法を提案した。この方法の骨子は、炉の
上部に原料装入口をそして炉の下部付近に上下二段の羽
口をもつ竪型炉を用いて含クロム溶銑を製造するもので
あり、上部の原料装入口からクロム源、鉄源、炭材およ
び造滓材を装入し、該上下の羽口から熱風を吹込むと同
時に羽口から粉状クロム鉱石および発熱材を炉内に供給
することにより、この粉状クロム鉱石を溶融還元しなが
ら含クロム溶銑を得るものである。On the other hand, Japanese Patent Application No. 18219/1989 filed by the same applicant as the present application
No. 60-162718), a special vertical furnace was used to melt and reduce powdered chromium ore as part of the chromium source by injecting it into the tuyeres of the vertical furnace. We proposed a method to achieve this. The gist of this method is to produce chromium-containing hot metal using a vertical furnace with a raw material charging port in the upper part of the furnace and two stages of upper and lower tuyere near the bottom of the furnace. By charging a chromium source, iron source, carbon material, and slag material, and blowing hot air through the upper and lower tuyeres, powdered chromium ore and heat-generating material are simultaneously supplied into the furnace through the tuyere. This method obtains chromium-containing hot metal by melting and reducing chromium ore.
本発明は、前記の特願昭５９−１８２１９号に提案した
竪型炉によるクロム鉱石の溶融還元法の一層の改善を図
ることを目的としたものである。特に、この竪型炉を使
用した含クロム溶銑の製造に際してのクロム鉱石の還元
反応を有利に進行させることにより熱的な面および材料
面での経済性の向上とクロム収率の向上を目的としたも
のである。The object of the present invention is to further improve the method for melting and reducing chromium ore using a vertical furnace, which was proposed in the above-mentioned Japanese Patent Application No. 18219/1982. In particular, when producing chromium-containing hot metal using this vertical furnace, the reduction reaction of chromium ore proceeds favorably, with the aim of improving economic efficiency in terms of thermal and material aspects and improving chromium yield. This is what I did.
本発明は、炉の上部に原料装入口をそして炉の下部付近
に上下二段の羽口をもつ竪型炉を用いて含クロム溶銑を
製造するにさいし、該上部の原料装入口から鉄源、炭材
および造滓材、更には必要に応じてクロム源を装入し、
該上下の羽口から高温酸素富化空気を吹込むと同時に、
゛上段羽口から粉状クロム鉱石および造滓材を炉内に供
給することにより、この粉状クロム鉱石を溶融還元しな
がら含クロム溶銑を製造する方法において、前記の上段
羽口から吹き込む粉状クロム鉱石および造滓材の一部ま
たは全部として、溶融状態の製鋼スラグに粉状クロム鉱
石を分散添加したうえ凝固させ次いで粉砕して得たクロ
ム鉱石含有製鋼スラグ粉を用いることを特徴とする。The present invention provides a method for producing chromium-containing hot metal using a vertical furnace having a raw material charging port in the upper part of the furnace and two stages of upper and lower tuyere near the bottom of the furnace. , carbon material and slag material, and if necessary, a chromium source,
At the same time, high-temperature oxygen-enriched air is blown from the upper and lower tuyeres,
``In a method of producing chromium-containing hot metal while melting and reducing the powdered chromium ore by supplying powdered chromium ore and slag making material into the furnace from the upper tuyere, It is characterized in that a chromium ore-containing steelmaking slag powder obtained by dispersing and adding powdered chromium ore to molten steelmaking slag, solidifying and pulverizing the steelmaking slag is used as part or all of the chromium ore and slag material.
第１図に本発明法を実施する竪型炉並びに本発明に従っ
てクロム鉱石含有製鋼スラグ粉を製造するフローの例を
示した。図示のように、この竪型炉は全体としては縦長
のシャフトからなり、この炉の上部には、原料装入口１
が、また、下部には。FIG. 1 shows an example of a vertical furnace for carrying out the method of the present invention and a flow for producing chromium ore-containing steelmaking slag powder according to the present invention. As shown in the figure, this vertical furnace consists of a vertically long shaft as a whole, and there is a raw material charging port in the upper part of the furnace.
But also at the bottom.
上段羽口２と下段羽口３とからなる二段羽口が設けられ
ている。４は熱風炉であり、この熱風炉４で得られた熱
風が各羽口２と３に供給される。そのさい、酸素源５に
よって熱風に酸素を富化することができるようになって
いる。上段羽口２にはこの高温酸素富化空気と共に容器
６内の粉状クロム鉱石１５と容器７内の粉状造滓材１６
がキャリアガス８によって供給され、これらが炉内に吹
き込まれる。これらの羽口供給物質の、一部または全部
として９本発明ではクロム鉱石含有製鋼スラグ粉が使用
される。なお図において、 １０〜１２は、クロム源と
しての高炭素フェロクロム、鉄源としての鋼屑、炭材と
しての冶金用コークス１ 造滓材としての石灰石や螢石
などを収容する容器群であり、これらの炉頂装入原料は
計量器１３によって所定の量となるように計量されなが
ら原料装入口ｌから炉内に装入される。クロム源として
の高炭素フェロクロムは必要に応じて使用すればよい。A two-stage tuyere consisting of an upper tuyere 2 and a lower tuyere 3 is provided. 4 is a hot air stove, and hot air obtained from this hot air stove 4 is supplied to each tuyere 2 and 3. At this time, the hot air can be enriched with oxygen by the oxygen source 5. In the upper tuyere 2, together with this high-temperature oxygen-enriched air, powdered chromium ore 15 in a container 6 and powdered slag material 16 in a container 7 are stored.
are supplied by carrier gas 8, which are blown into the furnace. In the present invention, chromium ore-containing steelmaking slag powder is used as part or all of these tuyere feed materials. In the figure, 10 to 12 are containers containing high-carbon ferrochrome as a chromium source, steel scrap as an iron source, metallurgical coke 1 as a carbon material, limestone and fluorite as a slag material, These raw materials charged at the top of the furnace are weighed to a predetermined amount by a measuring device 13 and charged into the furnace from the raw material charging port l. High carbon ferrochrome as a chromium source may be used as necessary.
場合によっては、高炭素フェロクロムは炉頂からは装入
しないで、必要なりロム源の全部を羽口から供給する物
質で賄うことも可能である０図において、１７は出銑口
、 １８は生成した炉内含クロム溶銑を示している。In some cases, high carbon ferrochrome may not be charged from the top of the furnace, and if necessary, all of the chromium source may be supplied from the tuyere. The figure shows chromium-containing hot metal in the furnace.
本発明者らはこのような竪型炉によるクロム鉱石の吹き
込みにさいし、上段羽口から炉内に吹込む粉状クロム鉱
石をどのようにしたら高い収率で良好に溶融還元せしめ
ることができるかという点を重点項目にして実験を重ね
た。その結果、クロム鉱石を製鋼スラグと一体化して吹
き込むと良好な成績が得られることを知見した。すなわ
ち１図示のように、溶滓鍋２１内の溶融した製鋼スラグ
２０に適量の粉状クロム鉱石１５を分散添加してスラグ
中にクロム鉱石を含有させる。そして凝固させて塊状物
２２を作る。これをボールミル２３などの粉砕機で粉砕
して粉状のクロム鉱石含有製鋼スラグ粉２４を作る。こ
れはクロム鉱石と製鋼スラグとが一体となった粉末であ
り、これを羽口から吹き込むのである。この一体化した
粉末中のクロム鉱石分は溶融還元されるべきクロム源と
して、また製鋼スラグ分は造滓材として本発明の方法に
供されることになる。このクロム鉱石含有製鋼スラグ粉
を製造するのに使用する製鋼スラグとしては、普通鋼の
製鋼段階で生成するスラグでもよいが、ステンレス鋼の
製鋼段階で生成するスラグでもよい。When injecting chromium ore using such a vertical furnace, the present inventors have wondered how to melt and reduce the powdered chromium ore that is injected into the furnace from the upper tuyere in a high yield. We conducted repeated experiments with this point in mind. As a result, it was found that good results could be obtained by injecting chromium ore into steelmaking slag. That is, as shown in FIG. 1, an appropriate amount of powdered chromium ore 15 is dispersed and added to the molten steelmaking slag 20 in the slag ladle 21, so that the chromium ore is contained in the slag. Then, it is solidified to form a lump 22. This is crushed by a crusher such as a ball mill 23 to produce powdered chromium ore-containing steelmaking slag powder 24. This powder is a combination of chromium ore and steelmaking slag, and is injected through the tuyere. The chromium ore component in this integrated powder is used as a chromium source to be melted and reduced, and the steelmaking slag component is used as a slag material in the method of the present invention. The steelmaking slag used to produce this chromium ore-containing steelmaking slag powder may be the slag produced during the steelmaking stage of ordinary steel, or the slag produced during the steelmaking stage of stainless steel.
後者の場合にはスラグ中のクロム酸化物も本発明法では
クロム源の一部として利用され得ることになる。また粉
状クロム鉱石を添加したあとの凝固の過程で室温まで冷
却せず、高温の状態で粉砕を完了したものをそのまま羽
口に吹き込めばその顕熱を炉内反応に存効に利用できる
。In the latter case, chromium oxide in the slag can also be used as part of the chromium source in the method of the present invention. Furthermore, if powdered chromium ore is not cooled down to room temperature during the solidification process after being added, but the pulverized chromium ore is blown into the tuyere at a high temperature, the sensible heat can be effectively utilized for reactions within the furnace.
クロム鉱石の溶融還元を行う場合の造滓材としては生石
灰および珪砂を使用するのが好ましいと考えられるが、
かような生石灰および珪砂からなる造滓材を羽口から吹
き込む場合には、必ずしも還元が存利に進行しないこと
がわかった。すなわち、上段羽口から炉内に吹き込まれ
た粉状クロム鉱石と粉状の造滓材はコークスの燃焼流域
１９内で昇温されてます造滓材が融液化し、この融液内
に粉状クロム鉱石が懸濁しながらコークス層内を滴下し
、そのさいにクロム鉱石が溶融還元するものと考えられ
るが、造滓材として各々融点が比較的高い生石灰および
珪砂を用いた場合には、生石灰と珪砂が互いに接触しな
ければ融液化が進行しないのでこの造滓材の融液化が遅
れ、これによってクロム鉱石の溶融還元反応も遅延する
ことにならざるを得ない、これを回避すべく各々粉体の
生石灰と珪砂をよく混合して吹き込んでも５羽口から吹
き込まれた段階では両者がばらばらに離れることは避け
られず９両者の接触を高めるには限界がある。またバイ
ンダーなどを使用して塊状にするとキャリヤーガスによ
る吹き込みが困難となり。It is considered preferable to use quicklime and silica sand as slag materials when melting and reducing chromium ore.
It has been found that when such slag material consisting of quicklime and silica sand is injected through the tuyere, reduction does not necessarily proceed to its full potential. That is, the powdered chromium ore and powdered slag material injected into the furnace from the upper tuyere are heated in the coke combustion region 19. It is thought that the chromium ore drips through the coke layer while suspended, and the chromium ore is melted and reduced during this process. However, when quicklime and silica sand, each of which has a relatively high melting point, are used as slag-forming materials, quicklime If the slag and silica sand do not come into contact with each other, the melting will not proceed, so the melting of this slag material will be delayed, which will also delay the smelting reduction reaction of the chromium ore.To avoid this, each powder is Even if quicklime and silica sand are thoroughly mixed and blown into the tuyeres, it is inevitable that they will separate when they are blown into the tuyere,9 and there is a limit to how much contact can be made between the two. Also, if a binder is used to form a lump, it becomes difficult to blow in with a carrier gas.
炉内での均一分散にも問題が生ずる。これに対して本発
明にしたが、うクロム鉱石含有製鋼スラグ粉を吹き込ん
だ場合には、このような不都合が解決されクロム鉱石は
高い還元率で還元されることが判明した。これは、滓化
分が一体化している製鋼スラグでは融解がし易いのでコ
ークス燃焼領域１９内においてはこれが簡単にまず融液
化し、その中の粉状クロム鉱石並びにその近辺の粉状ク
ロム鉱石の溶解もこれに伴って進行するからであろう。Problems also arise with uniform dispersion within the furnace. In contrast, in the present invention, it has been found that when chromium ore-containing steelmaking slag powder is injected, such inconveniences are solved and the chromium ore is reduced at a high reduction rate. This is because steelmaking slag in which the slag content is integrated is easily melted, so it easily becomes a melt in the coke combustion region 19, and the powdered chromium ore in it and the powdered chromium ore in the vicinity This is probably because dissolution also progresses along with this.
この融解並びに溶解が促進すれば、コークス燃焼領域１
９の近傍のコークス層内でも溶解したクロム鉱石の溶融
還元反応が促進され、これによってクロム鉱石は良好に
還元されることになる。If this melting and melting is promoted, coke combustion area 1
The smelting reduction reaction of the dissolved chromium ore is also promoted in the coke layer near No. 9, so that the chromium ore is effectively reduced.
クロム鉱石含有製鋼スラグ粉中の粉状クロム鉱石の割合
については、製鋼スラグが造滓材として機能するように
製鋼スラグの状態や種類によって適切に決めればよく、
特に限定されない、そして羽口からの吹き込みにさいし
て、クロム鉱石含有！Ｒ鋼スラグ粉と粉状クロム鉱石と
の割合を適切に調整することにより、全体のクロム鉱石
分に対する全体の造滓材の割合を調整すればよい。その
さい、クロム鉱石含有製鋼スラグ粉中のＳｉＯ□分が不
足する場合には珪砂などを混合して羽口に供給してもよ
い、また、クロム鉱石含有製鋼スラグ粉並びに粉状クロ
ム鉱石の粒度の調整も適切に調整すればよい、−例を挙
げると、平均粒径が０．０７４ｍｍ以下のクロム鉱石含
有製鋼スラグ粉と平均粒径が０．０７５〜０．５ｍｍの
粉状クロム鉱石とを上段羽口から吹き込んだ場合の例で
はダストとして炉外に排出される粉状クロム鉱石の量が
低減できた。また平均粒径が０．２５ｍｍ以上のクロム
鉱石含有製鋼スラグ粉と平均粒径が０．２５ｍｍ以下の
粉状クロム鉱石とを上段羽口から吹き込んだ場合には、
クロム鉱石の溶融還元反応が良好に進行して竪型炉から
排出されたスラグ中の未還元クロム濃度は低い値を示し
た。The proportion of powdered chromium ore in the chromium ore-containing steelmaking slag powder may be determined appropriately depending on the condition and type of the steelmaking slag so that the steelmaking slag functions as a slag material.
Contains chromium ore without particular limitation, and when injected from the tuyere! By appropriately adjusting the ratio of R steel slag powder and powdered chromium ore, the ratio of the total slag material to the total chromium ore content may be adjusted. At that time, if the SiO□ content in the chromium ore-containing steelmaking slag powder is insufficient, silica sand or the like may be mixed and supplied to the tuyere. - For example, chrome ore-containing steelmaking slag powder with an average particle size of 0.074 mm or less and powdered chromium ore with an average particle size of 0.075 to 0.5 mm may be adjusted appropriately. In the case of blowing from the upper tuyere, the amount of powdered chromium ore discharged outside the furnace as dust could be reduced. Furthermore, when chromium ore-containing steelmaking slag powder with an average particle size of 0.25 mm or more and powdered chromium ore with an average particle size of 0.25 mm or less are injected from the upper tuyere,
The smelting and reduction reaction of the chromium ore progressed well, and the unreduced chromium concentration in the slag discharged from the vertical furnace showed a low value.
以上のようにして１本発明法に従ってクロム鉱石含有製
鋼スラグ粉を粉状クロム鉱石および造滓材の全部または
一部として羽口から吹き込む場合には、クロム鉱石の溶
解が容易に進行するので羽口から吹き込む物質中にはフ
ェロクロムやフェロシリコンなどの発熱材を特に混在さ
せなくとも十分に溶融還元が行い得るし、高温酸素富化
空気の温度や酸素濃度についてもこれを軽減した状態で
高いクロム還元率を達成することが可能となる。As described above, 1. When chromium ore-containing steelmaking slag powder is injected from the tuyere as all or a part of powdered chromium ore and slag-making material according to the method of the present invention, the dissolution of the chromium ore progresses easily. It is possible to sufficiently melt and reduce the substance that is blown into the mouth without mixing heat-generating materials such as ferrochrome or ferrosilicon, and it is possible to achieve high chromium even if the temperature and oxygen concentration of the high-temperature oxygen-enriched air are reduced. It becomes possible to achieve the return rate.
そして、取り扱いに難のある禁水性物質の生石灰を使用
しないで済むことは操業面および安全面で有利であり且
つ経済的でもある。またクロム鉱石含有製鋼スラグ粉製
造のための製鋼スラグとしてステンレス鋼製造時の酸化
クロム含有スラグを使用した場合にはその酸化クロムも
クロム源として利用できるので一石二鳥の効果がある。Furthermore, not using quicklime, which is a water-retaining substance that is difficult to handle, is advantageous in terms of operation and safety, and is also economical. Furthermore, when chromium oxide-containing slag from the production of stainless steel is used as steelmaking slag for producing chromium ore-containing steelmaking slag powder, the chromium oxide can also be used as a chromium source, resulting in the effect of killing two birds with one stone.
以下に試験用竪型炉による本発明法の実施結果を挙げる
。The results of implementing the method of the present invention using a test vertical furnace are listed below.
実施例１
第１図に示したような炉内径が０．６ｍの竪型炉の上部
から第１表に示すような量で炉頂装入原料を装入し、温
度が８００℃、酸素濃度が２４％の高温酸素富化空気を
上下段の羽口から炉内に吹き込み。Example 1 Top charging materials were charged from the top of a vertical furnace with an inner diameter of 0.6 m as shown in Figure 1 in the amounts shown in Table 1, and the temperature was 800°C and the oxygen concentration was 24% high-temperature oxygen-enriched air is blown into the furnace from the upper and lower tuyeres.
且つ上段羽口からは、第２表に示す量で粉状クロム鉱石
とクロム鉱石含有製鋼スラグ粉の混合物を炉内に吹き込
んだ。クロム鉱石含有製鋼スラグ粉は、溶融したステン
レス鋼スラグｌトン当り粉状クロム鉱石ｆｒ １００Ｋ
ｇ添加したあと、５００℃まで冷却して凝固させ、粉砕
したものである。この結果として、クロムの収率は９７
．０％となり、また第３表に示す組成の含クロム溶銑を
得た。In addition, a mixture of powdered chromium ore and chromium ore-containing steelmaking slag powder was blown into the furnace from the upper tuyere in the amounts shown in Table 2. Steelmaking slag powder containing chromium ore is powdered chromium ore fr 100K per ton of molten stainless steel slag.
After adding g, it was cooled to 500°C, solidified, and pulverized. As a result, the yield of chromium is 97
．． 0%, and chromium-containing hot metal having the composition shown in Table 3 was obtained.
第２表（上段羽口吹き込み物質）
第３表（含クロム溶銑の組成 重量％）実施例２（比較
例）
実施例１と同一の炉頂装入原料を実施例１と同じ竪型炉
の炉頂から装入し、全体の酸化クロム量と造滓量が前記
第２表の配合と実質上同じになる量に調整した第４表の
粉体配合物を上段羽口から吹き込み、温度が８００℃で
酸素濃度が２８．５％の高温酸素富化空気を上下段の羽
口から供給した。Table 2 (Upper tuyere injection material) Table 3 (Composition of chromium-containing hot metal, weight %) Example 2 (Comparative example) The same top charging material as in Example 1 was used in the same vertical furnace as in Example 1. The powder mixture shown in Table 4, which was charged from the top of the furnace and adjusted so that the total amount of chromium oxide and the amount of slag would be substantially the same as the mixture shown in Table 2 above, was blown through the upper tuyere, and the temperature was increased. High-temperature oxygen-enriched air with an oxygen concentration of 28.5% at 800° C. was supplied from the upper and lower tuyeres.
この結果、クロム収率９７．２％で含クロム溶銑を製造
できた。As a result, chromium-containing hot metal could be produced with a chromium yield of 97.2%.
第４表（上段羽口吹き込み物質）
実施例３ （比較例）
高温酸素富化空気の酸素濃度を２４％にした以外には実
施例２を繰り返した。その結果、クロム収率は８６．３
％となった。Table 4 (Upper Tuyere Blowing Materials) Example 3 (Comparative Example) Example 2 was repeated except that the oxygen concentration of the hot oxygen-enriched air was 24%. As a result, the chromium yield was 86.3
%.
第１図は本発明法に実施するのに好適な竪型炉の略断面
図である。
■・・炉上部の原料装入口、２・・上段羽口。
３・・下段羽口、４・・熱風炉、５・・酸素源。
１５・・粉状クロム鉱石、 １９・・コークス燃焼領
域、２０ ・・溶融状態の製鋼スラグ、２１・・溶滓
鍋、２２・・凝固した塊状のクロム鉱石含有製綱スラグ
、２３・・ボールミル、２４・・クロム鉱石含を製鋼ス
ラグ粉。FIG. 1 is a schematic cross-sectional view of a vertical furnace suitable for carrying out the method of the present invention. ■... Raw material charging port at the top of the furnace, 2... Upper tuyere. 3. Lower tuyere, 4. Hot blast furnace, 5. Oxygen source. 15...Powdered chromium ore, 19...Coke burning area, 20...Steel making slag in molten state, 21...Slag ladle, 22...Rope making slag containing solidified lumpy chromium ore, 23...Ball mill, 24. Steelmaking slag powder containing chromium ore.
Claims (1)
の羽口をもつ竪型炉を用いて含クロム溶銑を製造するに
さいし、該上部の原料装入口から鉄源、炭材および造滓
材、更には必要に応じてクロム源を装入し、該上下の羽
口から高温酸素富化空気を吹込むと同時に、上段羽口か
ら粉状クロム鉱石および造滓材を炉内に供給することに
より、この粉状クロム鉱石を溶融還元しながら含クロム
溶銑を製造する方法において、 前記の上段羽口から吹き込む粉状クロム鉱石および造滓
材の一部または全部として、溶融状態の製綱スラグに粉
状クロム鉱石を分散添加したうえ凝固させ次いで粉砕し
て得たクロム鉱石含有製鋼スラグ粉を用いることを特徴
とする含クロム溶銑の製造法。[Claims] When producing chromium-containing hot metal using a vertical furnace having a raw material charging port in the upper part of the furnace and upper and lower tuyeres near the bottom of the furnace, Iron source, carbonaceous material, slag material, and chromium source are charged as necessary, and high-temperature oxygen-enriched air is blown from the upper and lower tuyeres, and at the same time, powdered chromium ore and slag-forming material are charged from the upper tuyere. In a method of producing chromium-containing hot metal while melting and reducing powdery chromium ore by supplying slag material into the furnace, part or all of the powdery chromium ore and slag-making material injected from the upper tuyere are A method for producing chromium-containing hot metal, which is characterized by using chromium ore-containing steelmaking slag powder obtained by dispersing and adding powdered chromium ore to molten steelmaking slag, solidifying it, and then pulverizing it.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61009586A JPS62167809A (en) | 1986-01-20 | 1986-01-20 | Production of molten chromium iron |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61009586A JPS62167809A (en) | 1986-01-20 | 1986-01-20 | Production of molten chromium iron |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62167809A true JPS62167809A (en) | 1987-07-24 |
Family
ID=11724424
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61009586A Pending JPS62167809A (en) | 1986-01-20 | 1986-01-20 | Production of molten chromium iron |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62167809A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63153207A (en) * | 1986-08-11 | 1988-06-25 | Sumitomo Metal Ind Ltd | Method for smelting reduction of chromium ore |
| JPH01294812A (en) * | 1988-05-20 | 1989-11-28 | Nisshin Steel Co Ltd | Production of base metal for stainless steel |
| KR100400869B1 (en) * | 1998-12-29 | 2003-12-24 | 주식회사 포스코 | Prevention of Slag Peroxidation in Electric Furnace |
-
1986
- 1986-01-20 JP JP61009586A patent/JPS62167809A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63153207A (en) * | 1986-08-11 | 1988-06-25 | Sumitomo Metal Ind Ltd | Method for smelting reduction of chromium ore |
| JPH01294812A (en) * | 1988-05-20 | 1989-11-28 | Nisshin Steel Co Ltd | Production of base metal for stainless steel |
| KR100400869B1 (en) * | 1998-12-29 | 2003-12-24 | 주식회사 포스코 | Prevention of Slag Peroxidation in Electric Furnace |
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