JPH0159327B2 - - Google Patents
Info
- Publication number
- JPH0159327B2 JPH0159327B2 JP61009585A JP958586A JPH0159327B2 JP H0159327 B2 JPH0159327 B2 JP H0159327B2 JP 61009585 A JP61009585 A JP 61009585A JP 958586 A JP958586 A JP 958586A JP H0159327 B2 JPH0159327 B2 JP H0159327B2
- Authority
- JP
- Japan
- Prior art keywords
- chromium
- slag
- furnace
- powdered
- 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.)
- Expired
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- 239000011651 chromium Substances 0.000 claims description 67
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 65
- 229910052804 chromium Inorganic materials 0.000 claims description 65
- 239000002893 slag Substances 0.000 claims description 41
- 239000000463 material Substances 0.000 claims description 26
- 238000009628 steelmaking Methods 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 14
- 229910052751 metal Inorganic materials 0.000 claims description 13
- 239000002184 metal Substances 0.000 claims description 13
- 239000002994 raw material Substances 0.000 claims description 11
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 8
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 8
- 229910052760 oxygen Inorganic materials 0.000 claims description 8
- 239000001301 oxygen Substances 0.000 claims description 8
- 239000003575 carbonaceous material Substances 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 229910052742 iron Inorganic materials 0.000 claims description 4
- 238000007664 blowing Methods 0.000 claims description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 23
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 14
- 238000002844 melting Methods 0.000 description 10
- 230000008018 melting Effects 0.000 description 10
- 239000000377 silicon dioxide Substances 0.000 description 8
- 239000000292 calcium oxide Substances 0.000 description 7
- 235000012255 calcium oxide Nutrition 0.000 description 7
- 239000000571 coke Substances 0.000 description 7
- 239000004576 sand Substances 0.000 description 7
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 description 5
- 229910000423 chromium oxide Inorganic materials 0.000 description 5
- 238000006722 reduction reaction Methods 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 229910000604 Ferrochrome Inorganic materials 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 4
- 239000000155 melt Substances 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
- 238000003723 Smelting Methods 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 229910001220 stainless steel Inorganic materials 0.000 description 3
- 239000010935 stainless steel Substances 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000012159 carrier gas Substances 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 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
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 230000001934 delay Effects 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
- 230000000694 effects Effects 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
- 239000006028 limestone Substances 0.000 description 1
- 238000010309 melting process Methods 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 229910052905 tridymite Inorganic materials 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture Of Iron (AREA)
Description
〔産業上の利用分野〕
本発明は、電力を製練用のエネルギーとして使
用することなく、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。
〔従来の技術〕
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、コークス、フラツクスおよび
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、高炭素フエロクロムが使用されるのが通常
である。この高炭素フエ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
半還元ペレツ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
元材によつて直接的に溶融還元する方法の開発が
推進されている。その傾向としては、転炉によつ
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。例えば特開昭58−77548号公報、
特開昭59−145758号公報、特開昭59−150059号公
報、特開昭59−150060号公報、特開昭59−150061
号公報、特開昭59−150062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。
一方、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
とによつ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。
〔発明の目的〕
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
ての操業性の向上とクロム収率の向上を目的とし
たものである。
〔目的を達成する手段〕
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、造滓材の一部または全部と
して粉状化した製鋼スラグを用いることを特徴と
する。
第１図に本発明法を実施する竪型炉の例を示し
た。図示のように、この竪型炉は全体としては縦
長のシヤフトからなり、この炉の上部には、原料
装入口１が、また下部には、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
よつて熱風に酸素を富化することができるように
なつている。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がキヤリアガス８によつて
供給され、これらが炉内に吹き込まれる。この粉
状造滓材１６としては、後に詳述するように本発
明では製鋼スラグ粉およびこれに必要に応じて珪
砂を混合したものが使用される。なお図におい
て、１０〜１２は、クロム源としての高炭素フエ
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、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によつて所定の量となるように計量さ
れながら原料装入口１から炉内に装入される。ク
ロム源としての高炭素フエロクロムは炉頂からは
装入しないで、必要なクロム源の全部を羽口から
供給する粉状クロム鉱石で賄うことができる。ま
た羽口から供給する製鋼スラグ粉としてステンレ
スの製鋼時に発生するクロム酸化物を含有するス
ラグを使用した場合には、このスラグ中のクロム
酸化物もクロム源の一部となる。図において、１
７は出銑口、１８は生成した炉内含クロム溶銑を
示している。
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２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、造
滓材として製鋼スラグを用いた場合に良好な成績
が得られることを知見した。炉頂から溶解原料並
びに炭材と共に装入する造滓材の一部または全部
としてこの製鋼スラグを使用することもできる
が、特に粉状クロム鉱石と共に羽口から吹き込む
粉状造滓材として粉状の製鋼スラグを使用した場
合に良好な結果が得られることがわかつた。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。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。製鋼スラグ
だけではSiO2分が不足する場合には、珪砂を混
合して使用する。本発明による場合には羽口から
吹き込む造滓材としては生石灰を使用しないでも
良好な結果が得られる。
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、本発明法の実施にさいして、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、必ずしも還元が有利に進行し
ないことがわかつた。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内で昇温されてまず造
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、これによつてクロム鉱石の溶融
還元反応も遅延することになる。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、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、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ヤリヤーガスによる吹き込
みが困難となり、炉内での均一分散にも問題が生
ずる。造滓材として粉状の製鋼スラグを使用した
場合、或いはこの粉状の製鋼スラグに珪砂を混合
して使用した場合には、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、コークス燃焼領域１９内でほ
ぼ完全に融液が生成するので、この領域近傍のコ
ークス層内でもクロム鉱石の溶融還元反応は十分
に促進されことになるからであろうと考えられ
る。
このようにして本発明によるとクロム鉱石を高
クロム収率のもとで溶融還元ができる。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り、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。
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。
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28.5％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、且つ上段羽口からは、第２表に示す粉末の混
合物を炉内に吹き込んだ。この結果として、出滓
口から取り出されたスラグ中の未還元クロム濃度
は0.6％、またクロムの収率は98.3％と良好にク
ロム鉱石の溶融還元を行うことができ、第３表に
示すようなCr濃度18.3％およびSi濃度0.4％の含
クロム溶銑を得ることができた。
[Industrial Application Field] The present invention relates to an economical method for producing chromium-containing hot metal that does not use electricity as energy for smelting and allows the use of chromium ore as a chromium source. [Prior 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, coke, flux, and optionally auxiliary materials are charged into a steelmaking arc furnace and melted to obtain chromium-containing hot metal. High carbon ferrochrome is usually used as the chromium source in this case. 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. Since this conventional method consumes a very large amount of electricity, in recent years, the development of a method for directly melting and reducing chromium ore using a reducing agent such as carbonaceous material has been promoted. The trend seems to be to focus on smelting and reducing chromium ore using converters. For example, Japanese Patent Application Laid-Open No. 58-77548,
JP-A-59-145758, JP-A-59-150059, JP-A-59-150060, JP-A-59-150061
JP-A-59-150062, etc. disclose melting and reduction of chromium ore using a converter. Furthermore, Japanese Patent Application Laid-Open No. 116317/1983 discloses a method for melting and reducing chromium ore using a special mixing tank. On the other hand, a patent application filed in 1983 by the same applicant as the present application
In No. 18219 (Japanese Unexamined Patent Publication No. 162718/1983),
We proposed a method of melting and reducing chromium ore as part of the chromium source by using a special vertical furnace and injecting powdered chromium ore as part of the chromium source into the tuyeres of this vertical furnace.
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. [Object of the Invention] 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. especially,
The purpose is to improve operability and chromium yield when producing chromium-containing hot metal using this vertical furnace. [Means for Achieving the Object] 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 upper and lower tuyeres near the lower part of the furnace. A chromium source, iron source, carbon material, and slag material are charged through the raw material charging port, and high-temperature oxygen-enriched air is blown through the upper and lower tuyeres, and at the same time, powdered chromium ore and slag material are charged through the upper tuyere. A method for producing chromium-containing hot metal while melting and reducing powdered chromium ore by supplying the material into a furnace, characterized in that powdered steelmaking slag is used as part or all of the slag-making material. do. FIG. 1 shows an example of a vertical furnace for carrying out the method of the present invention. As shown in the figure, this vertical furnace consists of a vertically long shaft as a whole, and the upper part of this furnace has a raw material charging port 1, and the lower part has two parts, each consisting of an upper tuyere 2 and a lower tuyere 3. Tiered tuyeres are 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. The powdered chromium ore 15 in the container 6 and the powdered slag material 16 in the container 7 are supplied to the upper tuyere 2 with the high-temperature oxygen-enriched air by the carrier gas 8, and these are blown into the furnace. . As will be described in detail later, in the present invention, the powdered slag material 16 is made of steelmaking slag powder and, if necessary, silica sand mixed therein. In the figure, 10 to 12 are a group of containers that contain high carbon ferrochrome as a chromium source, steel scrap as an iron source, metallurgical coke as a carbon material, limestone and fluorite as a slag material, These raw materials charged at the top of the furnace are charged into the furnace from the raw material charging port 1 while being weighed by a measuring device 13 to a predetermined amount. High carbon ferrochrome as a chromium source is not charged from the top of the furnace, and all the necessary chromium source can be provided by powdered chromium ore supplied from the tuyere. Furthermore, when slag containing chromium oxide generated during stainless steel manufacturing is used as the steelmaking slag powder supplied from the tuyere, the chromium oxide in this slag also becomes part of the chromium source. In the figure, 1
7 is the tap hole, and 18 is the generated chromium-containing hot metal in the furnace. When injecting chromium ore using such a vertical furnace, the present inventors have investigated how to melt and reduce the powdered chromium ore that is injected into the furnace from the upper tuyere 2 in a high yield. We conducted repeated experiments with this as our main focus. As a result, it was found that good results were obtained when steelmaking slag was used as the slag material. This steelmaking slag can be used as part or all of the slag material that is charged from the top of the furnace together with melted raw materials and carbonaceous material, but in particular, it can be used as a powdered slag material that is injected from the tuyere together with powdered chromium ore. It was found that good results were obtained when using steelmaking slag of The steelmaking slag used may be the slag produced during the steelmaking stage of ordinary steel, or the slag produced during the steelmaking stage of stainless steel. 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. If steelmaking slag alone does not provide enough SiO2 , silica sand is used in combination. In the case of the present invention, good results can be obtained even without using quicklime as the slag material blown into the tuyere. It is considered preferable to use quicklime and silica sand as slag materials when melting and reducing chromium ore. It has been found that reduction does not necessarily proceed favorably when blown into the mouth. 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, and the slag material first becomes a melt, and the powder is mixed into the melt. It is thought that the chromium ore drops into the coke layer while being suspended, and the chromium ore is melted and reduced during this process.
When quicklime and silica sand, each of which has a relatively high melting point, are used as slag-forming materials, the melting process does not proceed unless the quicklime and silica sand come into contact with each other, which delays the liquefaction of the slag-forming materials, which causes the chromium to melt. The melt reduction reaction of the ore will also be delayed. Even if powdered quicklime and silica sand are thoroughly mixed and blown into each other in order to avoid this, it is inevitable that the two will separate when blown through the tuyere, and there is a limit to how much contact can be made between the two. Furthermore, if a binder or the like is used to form a lump, it becomes difficult to blow in with a carrier gas, and there is also a problem in uniform dispersion in the furnace. If powdered steelmaking slag is used as a slag material, or if silica sand is mixed with this powdered steelmaking slag, these inconveniences will be resolved and chromium ore will be reduced at a high reduction rate. It has been found. This is considered to be because the melt is almost completely generated within the coke combustion region 19, so that the smelting and reduction reaction of the chromium ore is sufficiently promoted even within the coke layer near this region. In this manner, according to the present invention, chromium ore can be reduced by melting with a high chromium yield. and,
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. Since the chromium oxide can also be used as a chromium source, it has the effect of killing two birds with one stone. The results of implementing the method of the present invention using a test vertical furnace are listed below. Example 1 The raw materials for top charging were charged from the top of a vertical furnace with an inner diameter of 0.6 m as shown in Figure 1 in the amount shown in Table 1, and the temperature was 800°C and the oxygen concentration was High-temperature oxygen-enriched air of 28.5% was blown into the furnace through the upper and lower tuyeres, and a mixture of powders shown in Table 2 was blown into the furnace through the upper tuyeres. As a result, the unreduced chromium concentration in the slag taken out from the slag was 0.6%, and the chromium yield was 98.3%, making it possible to successfully melt and reduce chromium ore, as shown in Table 3. We were able to obtain chromium-containing hot metal with a Cr concentration of 18.3% and a Si concentration of 0.4%.
【表】【table】
【表】【table】
【表】
実施例 ２（比較例）
上段羽口から粉状クロム鉱石および生石灰と珪
砂からなる造滓材を吹き込んだ以外は実施例１と
同一の操業を行つた。そのさい、上段羽口から吹
き込んだ粉状クロム鉱石と造滓材の量は実施例１
と同じクロム酸化物量となるように調整した。ま
た造滓量並びにスラグ組成も実施例１と実質上同
じになるように調整した。その実際の量を第４表
に示した。
この結果、クロム収率は97.2％となり、実施例
１よりも低い値となつた。また、得られた含クロ
ム溶銑の組成は第５表に示す値となり、実施例１
の場合に比べてCr濃度は若干低くなりSi濃度は
高くなつた。[Table] Example 2 (Comparative Example) The same operation as in Example 1 was carried out except that powdered chromium ore, quicklime, and slag making material were blown into the upper tuyere. At that time, the amounts of powdered chromium ore and slag material injected from the upper tuyeres were as shown in Example 1.
The amount of chromium oxide was adjusted to be the same as . Further, the amount of slag and slag composition were adjusted to be substantially the same as in Example 1. The actual amounts are shown in Table 4. As a result, the chromium yield was 97.2%, which was lower than in Example 1. In addition, the composition of the obtained chromium-containing hot metal has the values shown in Table 5, and Example 1
Compared to the case of , the Cr concentration was slightly lower and the Si concentration was higher.
【表】【table】
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。
１……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、１６……製鋼スラグ等
の造滓材、１９……コークス燃焼領域。
FIG. 1 is a schematic cross-sectional view of a vertical furnace suitable for carrying out the method of the present invention. 1... Raw material charging port in the upper part of the furnace, 2... Upper tuyere,
3...Lower tuyere, 4...Hot stove, 5...Oxygen source,
15... Powdered chromium ore, 16... Slag material such as steelmaking slag, 19... Coke combustion area.
Claims (1)
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、造滓材の一部または全部として粉状
化した製鋼スラグを用いることを特徴とする含ク
ロム溶銑の製造法。1. When producing chromium-containing hot metal using a vertical furnace with a raw material charging port in the upper part of the furnace and upper and lower tuyeres near the bottom of the furnace, a chromium source and an iron source are supplied from the upper raw material charging port. , charging carbon material and slag material,
By blowing high-temperature oxygen-enriched air through the upper and lower tuyeres, and at the same time supplying powdered chromium ore and slag material into the furnace from the upper tuyere, the powdered chromium ore is melted down and reduced to contain chromium. A method for producing chromium-containing hot metal, the method comprising using powdered steelmaking slag as part or all of a slag material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP958586A JPS62167808A (en) | 1986-01-20 | 1986-01-20 | Production of molten chromium iron |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP958586A JPS62167808A (en) | 1986-01-20 | 1986-01-20 | Production of molten chromium iron |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62167808A JPS62167808A (en) | 1987-07-24 |
| JPH0159327B2 true JPH0159327B2 (en) | 1989-12-15 |
Family
ID=11724396
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP958586A Granted JPS62167808A (en) | 1986-01-20 | 1986-01-20 | Production of molten chromium iron |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62167808A (en) |
Families Citing this family (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 |
| JPH0726160B2 (en) * | 1988-03-18 | 1995-03-22 | 日新製鋼株式会社 | Method for recovering valuable metals from by-products during stainless steel production |
| JPH01294812A (en) * | 1988-05-20 | 1989-11-28 | Nisshin Steel Co Ltd | Production of base metal for stainless steel |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5834109A (en) * | 1981-08-22 | 1983-02-28 | Nippon Steel Corp | Blowing method for low si iron |
| JPS5877548A (en) * | 1981-10-31 | 1983-05-10 | Kawasaki Steel Corp | Melt reducing method for chrome ore |
-
1986
- 1986-01-20 JP JP958586A patent/JPS62167808A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5834109A (en) * | 1981-08-22 | 1983-02-28 | Nippon Steel Corp | Blowing method for low si iron |
| JPS5877548A (en) * | 1981-10-31 | 1983-05-10 | Kawasaki Steel Corp | Melt reducing method for chrome ore |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62167808A (en) | 1987-07-24 |
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