JPH01294812A - Production of base metal for stainless steel - Google Patents
Production of base metal for stainless steelInfo
- Publication number
- JPH01294812A JPH01294812A JP63121872A JP12187288A JPH01294812A JP H01294812 A JPH01294812 A JP H01294812A JP 63121872 A JP63121872 A JP 63121872A JP 12187288 A JP12187288 A JP 12187288A JP H01294812 A JPH01294812 A JP H01294812A
- Authority
- JP
- Japan
- Prior art keywords
- furnace
- chromium
- slag
- stainless steel
- coke
- 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
- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 22
- 239000010935 stainless steel Substances 0.000 title claims abstract description 20
- 239000010953 base metal Substances 0.000 title claims abstract description 14
- 238000004519 manufacturing process Methods 0.000 title claims description 18
- 239000002893 slag Substances 0.000 claims abstract description 41
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims abstract description 31
- 239000011651 chromium Substances 0.000 claims abstract description 31
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 30
- 239000000428 dust Substances 0.000 claims abstract description 18
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000002994 raw material Substances 0.000 claims abstract description 13
- 239000000463 material Substances 0.000 claims abstract description 11
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 8
- 229910000423 chromium oxide Inorganic materials 0.000 claims abstract description 7
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 claims abstract description 6
- 239000003575 carbonaceous material Substances 0.000 claims abstract description 6
- 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
- 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
- 239000012254 powdered material Substances 0.000 claims description 7
- 229910052742 iron Inorganic materials 0.000 claims description 4
- 239000000843 powder Substances 0.000 claims description 4
- 238000002844 melting Methods 0.000 claims description 3
- 230000008018 melting Effects 0.000 claims description 3
- 239000010802 sludge Substances 0.000 claims 1
- 239000000571 coke Substances 0.000 abstract description 10
- 229910000604 Ferrochrome Inorganic materials 0.000 abstract description 6
- 229910000831 Steel Inorganic materials 0.000 abstract description 5
- 239000010959 steel Substances 0.000 abstract description 5
- 229910001021 Ferroalloy Inorganic materials 0.000 abstract description 3
- 239000000567 combustion gas Substances 0.000 abstract description 2
- 238000002485 combustion reaction Methods 0.000 abstract description 2
- 229910044991 metal oxide Inorganic materials 0.000 abstract description 2
- 239000012768 molten material Substances 0.000 abstract 3
- 238000009628 steelmaking Methods 0.000 abstract 1
- 238000003723 Smelting Methods 0.000 description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 4
- 230000005611 electricity Effects 0.000 description 4
- 239000000155 melt Substances 0.000 description 4
- 239000000203 mixture Substances 0.000 description 3
- 229910000480 nickel oxide Inorganic materials 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- GNRSAWUEBMWBQH-UHFFFAOYSA-N oxonickel Chemical compound [Ni]=O GNRSAWUEBMWBQH-UHFFFAOYSA-N 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 230000018044 dehydration Effects 0.000 description 2
- 238000006297 dehydration reaction Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 229910000519 Ferrosilicon Inorganic materials 0.000 description 1
- 235000019738 Limestone Nutrition 0.000 description 1
- 229910000963 austenitic stainless steel Inorganic materials 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 239000006148 magnetic separator Substances 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 239000002923 metal particle Substances 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002912 waste gas 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
- C21B13/0013—Making spongy iron or liquid steel, by direct processes obtaining iron or steel in a molten state introduction of iron oxide into a bath of molten iron containing a carbon reductant
- C21B13/002—Reduction of iron ores by passing through a heated column of carbon
-
- 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
となくステンレス鋼のベースメタルを製造する方法にお
いて、クロム源やニッケル源の一部としてステンレス鋼
製造時に発生するスラグやダストおよび（または）クロ
ム鉱石を使用し、これらに含有されるクロム酸化物やニ
ッケル酸化物の溶融還元も同時に行えるようにした熱経
済的でしかも資源の再利用化が図れうるステンレスベー
スメタルの製造法に関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a method for producing base metals of stainless steel without using electricity as energy for smelting. Thermoeconomic and resource reuse that uses slag, dust, and/or chromium ore generated during stainless steel manufacturing, and simultaneously melts and reduces the chromium oxide and nickel oxide contained in these. This article relates to a method for manufacturing stainless steel base metal that can achieve this.
従来より、ステンレス鋼製造用のベースメタルの製造法
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−り炉に、クロム源、
ニッケル源、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、ステンレス鋼ベースメタルを
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が、この裔炭
素フェロクロムも、クロム鉱石の半還元ペレットや焼結
鉱を原料として、多大な電力を消費しながら、電気炉で
製造されている。BACKGROUND ART Conventionally, as a method for manufacturing base metals for manufacturing stainless steel, a method using an electric furnace has formed one technological system. In this method, a chromium source and
A nickel source, coke, flux, and optional auxiliary materials are charged and melted to obtain a stainless steel base metal. Usually, high carbon ferrochrome is used as the chromium source, but this progeny carbon ferrochrome is also made from semi-reduced pellets and sintered ore of chromium ore, and consumes a large amount of electricity. Manufactured in an electric furnace.
一方、アーク炉で溶製されたステンレスベースメタルは
、転炉等に装入され酸素吹錬によって脱炭されるが、そ
の時に、クロム酸化物等を含有したダストやスラグが生
成する。通常、スラグ中に含まれるクロム酸化物は、酸
化製錬終了後にフェロシリコンによって還元される。ま
た、ダスト中に含まれるクロムやニッケル等の有価金属
を回収するために、ダスト類をブリケット状に製団し、
それをサブマージドアーク炉に装入して、製錬を行なっ
ている例もある。On the other hand, stainless steel base metal melted in an arc furnace is charged into a converter or the like and decarburized by oxygen blowing, but at that time, dust and slag containing chromium oxide and the like are generated. Usually, chromium oxide contained in slag is reduced by ferrosilicon after oxidation smelting. In addition, in order to recover valuable metals such as chromium and nickel contained in the dust, the dust is made into briquettes.
In some cases, it is charged into a submerged arc furnace and smelted.
この様に、従来技術ではステンレス鋼の製造工程や製造
工程で発生するスラグやダストの処理過程で、その製錬
用エネルギーとして電力を多量に消費するとともに、電
力を多量に消費して製造された合金鉄が使用されている
のが現状である。In this way, with conventional technology, a large amount of electricity is consumed as energy for smelting in the manufacturing process of stainless steel and in the process of processing the slag and dust generated during the manufacturing process. Currently, ferroalloys are used.
この様な課題を解決するための一手段として、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りな
がら含クロム溶銑を製造する方法を提案した。この出願
人の提案に係る竪型炉による方法の骨子は、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
むクロム溶銑を得るものである。ただし、この発明では
、ステンレス鋼を製錬する際に発生するスラグやダスト
の処理方法については、未解決であった。As a means to solve such problems, Japanese Patent Application No. 18219/1982 (Japanese Unexamined Patent Publication No. 1983/1983) filed by the same applicant as the present application
162718), a special vertical furnace is used to melt and reduce chromium-containing hot metal by injecting powdered chromium ore as part of the chromium source into the tuyere of the vertical furnace. proposed a method for manufacturing. The gist of the method using a vertical furnace proposed by this applicant is to produce chromium-containing hot metal using a vertical furnace that has 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. It is a thing,
Chromium source, iron source, carbon material and slag material are charged from the upper raw material charging port, and hot air is blown from the upper and lower tuyeres at the same time.
By supplying powdered chromium ore and a heat generating material into the furnace through the tuyere, chromium hot metal containing the powdered chromium ore is obtained while being melted and reduced. However, in this invention, the method for treating slag and dust generated when stainless steel is smelted has not yet been solved.
本発明の目的とするところは、前記の特願昭５９−１８
２１９号（特開昭６０〜１６２７１８号公報）に提案し
た竪型炉による含クロム溶銑製造法を一層改善し、該竪
型炉内でステンレス製綱スラグやダスト中に含有される
クロムおよびニッケル酸化物を溶融還元しながらステン
レス鋼ベースメタルを製造する方法を提供することにあ
る。The object of the present invention is to
The method for producing chromium-containing hot metal using a vertical furnace proposed in No. 219 (Japanese Unexamined Patent Publication No. 162718) was further improved, and chromium and nickel oxide contained in stainless steel wire slag and dust were removed in the vertical furnace. An object of the present invention is to provide a method for manufacturing stainless steel base metal while melting and reducing a material.
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、
ニッケル源、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
からクロム酸化物および（または）ニッケル酸化物を含
有する粉状材料と粉状造滓材の混合物を炉内に供給する
ことにより、該粉状材料中の酸化物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、該原料製本日か
ら装入するクロム源の一部または全部を塊状のステンレ
ス製鋼スラグとすること、また、該上段羽口から炉内に
供給する粉状材料の一部または全部がダストおよび（ま
たは）スラグ粉であ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 upper and lower tuyeres near the bottom of the furnace. ,
A nickel source, an iron source, a carbon material, and a slag material are charged, and high-temperature oxygen-enriched air is blown from the upper and lower tuyeres, and at the same time, chromium oxide and/or nickel oxide are contained from the upper tuyere. In a method for producing chromium-containing hot metal while melting and reducing oxides in the powdered material by supplying a mixture of powdered material and powdered slag-forming material into a furnace, the raw material is charged from the production date. Part or all of the chromium source is lumpy stainless steel slag, and part or all of the powdered material fed into the furnace from the upper tuyere is dust and/or slag powder. shall be.
第１図に本発明法を実施する竪型炉の例を示した０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、上段羽口（複数個）２と下段羽口（複数個）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。Figure 1 shows an example of a vertical furnace for carrying out the method of the present invention.As shown in Figure 1, this vertical furnace consists of a vertically long shaft as a whole, and a raw material charging port 1 is installed in the upper part of the furnace. Further, in the lower part, two-stage tuyere consisting of upper tuyeres (plurality) 2 and lower tuyeres (plurality) 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.
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内のダスト１５と容器７内の粉
状スラグ１６、容器８の粉クロム鉱石１７、容器９の造
滓材がそれぞれ所定量供給され、これらが上段羽口２か
ら炉内に吹込まれる。なお図において、１０〜１３は、
クロム源としての高炭素フエロクロムや塊状のステンレ
ス鋼スラグ、ニッケル源としての高炭素フエ口ニノケル
、鉄源としての鋼屑、炭材としてのコークス、造滓材と
しての石灰石や珪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１から炉内に装入され
る。４０は出銑口、４工はステンレスベースメタルであ
る。At this time, the hot air can be enriched with oxygen by the oxygen source 5. The upper tuyere 2 is supplied with predetermined amounts of dust 15 in the container 6, powdered slag 16 in the container 7, powdered chromium ore 17 in the container 8, and slag material in the container 9 together with this high-temperature oxygen-enriched air. These are blown into the furnace from the upper tuyere 2. In addition, in the figure, 10 to 13 are
Container containing high carbon ferrochrome and lumpy stainless steel slag as a chromium source, high carbon ferrochrome as a nickel source, steel scrap as an iron source, coke as a carbon material, limestone and silica stone as a slag material, etc. 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. 40 is the taphole, and 4th hole is stainless steel base metal.
第２図は、竪型炉に供給する転炉スラグやダストの処理
フローを示したものである。転炉等の反応容器１９で酸
化製錬する際に発生するダスト２２は湿式除塵機２３で
製錬炉廃ガスと分離された後に、脱水乾燥設備２４で乾
燥して、竪型炉の粉体ホッパーに輸送する。一方、溶融
状態の転炉スラグ２０は、−ＪＢスラグポットに受け、
スラグの冷却ヤード２６まで輸送して、ヤードで冷却を
行なう。室温まで冷却せしめた転炉スラグは、破砕機２
７で粗破砕した後に、面で塊状の転炉スラグ２８と細粒
転炉スラグ２９に分離する。塊状の転炉スラグは一担ヤ
ードに貯蔵した後、竪型炉の炉頂装入原料用の容器群１
０〜１３のいずれかに輸送する。細粒の転炉スラグ２９
は、粉砕設備３０で粉砕して、湿式磁選機３１でスラグ
中に含まれる金属粒３２を分離した後に、脱水乾燥設備
３３で乾燥し、竪型炉の粉体ホッパーに直送する。FIG. 2 shows the processing flow of converter slag and dust supplied to the vertical furnace. Dust 22 generated during oxidation and smelting in a reaction vessel 19 such as a converter is separated from smelting furnace waste gas by a wet dust remover 23, and then dried in a dehydration drying equipment 24 to form powder in a vertical furnace. Transport to hopper. On the other hand, the converter slag 20 in a molten state is received in a -JB slag pot,
The slag is transported to a cooling yard 26 and cooled there. The converter slag cooled to room temperature is sent to crusher 2.
After being roughly crushed in step 7, the converter slag is separated into lumpy converter slag 28 and fine converter slag 29 on the surface. After the lumpy converter slag is stored in a storage yard, it is transferred to container group 1 for charging raw material at the top of the vertical furnace.
Transport to any of 0 to 13. Fine-grained converter slag 29
The slag is crushed in a crushing equipment 30, metal particles 32 contained in the slag are separated in a wet magnetic separator 31, dried in a dehydration drying equipment 33, and directly sent to a powder hopper in a vertical furnace.
以上のフローで処理した転炉スラグやダストは前述した
ように、炉上部の原料装入口あるいは上段羽口から竪型
炉に供給されるわけであるが、上段羽口から造滓材やク
ロム鉱石等とともに供給された粉状の転炉スラグやダス
トは該上段羽口前で形成されるコークスの燃焼領域で溶
融し、その溶融物が炉の下部へ滴下する過程で、溶融物
中のクロム酸化物等がコークス等の炭材によって還元さ
れる。他方、炉上部から供給される塊状の転炉スラグは
、コークス、フェロクロム、鋼屑等とともに炉内を降下
する過程で、炉下部から炉上部へ流通するコークスの燃
焼ガスによって昇温され１、しだいに溶融する。溶融状
態となった転炉スラグ中に含有される金属の酸化物は、
炉下部へ滴下する途中に還元される。このようにして還
元されたクロムやニッケル等は炉上部から供給した鋼屑
や合金鉄の溶融物と炉下部で混合されて、最終的にはス
テンレス鋼のヘースメタルとなって炉外へ排出される。As mentioned above, the converter slag and dust processed through the above flow are supplied to the vertical furnace from the raw material charging port at the top of the furnace or the upper tuyere. Powdered converter slag and dust supplied with the above are melted in the coke combustion area formed in front of the upper tuyere, and in the process of the melt dripping to the bottom of the furnace, chromium oxidation in the melt is generated. substances are reduced by carbon materials such as coke. On the other hand, the lumpy converter slag supplied from the upper part of the furnace is heated by the coke combustion gas flowing from the lower part to the upper part of the furnace as it descends in the furnace together with coke, ferrochrome, steel scraps, etc. melts into The metal oxides contained in the molten converter slag are
It is reduced while dropping to the lower part of the furnace. The chromium, nickel, etc. reduced in this way are mixed with the steel scraps and molten ferroalloy supplied from the upper part of the furnace in the lower part of the furnace, and are finally discharged outside the furnace as stainless steel heat metal. .
実施例１゜
第１図に示したような炉内径が０．６ ｍの竪型炉であ
って、底部に２本の上段羽口と２本の下段羽口を取り付
けた竪型炉の上部から、第１表に示すような量で炉頂装
入原料を装入し、上段羽口および下段羽口からそれぞれ
２．３Ｎｍ／ｍｉｎおよび２．８Ｎｎ？／ｍｉｎの流量
で、温度が８００℃、酸素濃度が２６％、湿分が５ｇ／
Ｎｒｒｒの高温酸素富化空気を炉内に吹込み、かつ上段
羽口からは、第２表に示す粉状材料を炉内に吹込んだ。Example 1゜The upper part of a vertical furnace with an inner diameter of 0.6 m as shown in Fig. 1, with two upper tuyeres and two lower tuyeres attached to the bottom. Then, the furnace top charging material was charged in the amount shown in Table 1, and the rate was 2.3 Nm/min and 2.8 Nn? from the upper and lower tuyeres, respectively. /min flow rate, temperature is 800℃, oxygen concentration is 26%, and humidity is 5g/min.
Nrrr of high-temperature oxygen-enriched air was blown into the furnace, and powdered materials shown in Table 2 were blown into the furnace from the upper tuyere.
この結果として、メタル歩留９９％、クロム歩留９７％
で第３表に示すような組成のオーステナイト系ステンレ
ス鋼ベースメタルを得た。As a result, the metal yield is 99% and the chromium yield is 97%.
An austenitic stainless steel base metal having the composition shown in Table 3 was obtained.
第１表
第２表
実施例２゜
第４表に示した量の原料を炉頂から装入し、かつ、第５
表に示した量の粉状転炉スラグを上段羽口から吹込んだ
以外は、実質的に実施例１と同一の条件で竪型炉を操業
して、第６表に示したような組成のフェライト系ステン
レス鋼ベースメタルを得た。この時のメタル歩留は９９
．６％、クロム歩留は９５．９％であった。Table 1 Table 2 Example 2゜The amount of raw materials shown in Table 4 was charged from the top of the furnace, and
The vertical furnace was operated under substantially the same conditions as in Example 1, except that the amount of powdered converter slag shown in the table was injected from the upper tuyere, and the composition shown in Table 6 was obtained. A ferritic stainless steel base metal was obtained. The metal yield at this time was 99
．． 6%, and the chromium yield was 95.9%.
第４表
第５表
〔発明の効果〕
このようにして、本発明法を採用すれば、製錬用エネル
ギーとして電力を用いることなくステンレスベースメタ
ルを溶解でき、しかも、ステンレス製錬過程等で発生す
るスラグやダスト類からの有価金属の回収が可能となり
、資源の有効利用に寄与できる。Table 4 Table 5 [Effects of the Invention] In this way, by adopting the method of the present invention, stainless steel base metals can be melted without using electricity as energy for smelting, and moreover, This makes it possible to recover valuable metals from slag and dust, contributing to the effective use of resources.
第１図は本発明法を実施するのに好適な竪型炉の略断面
図、第２図は転炉スラグやダストの処理フロー図である
。FIG. 1 is a schematic sectional view of a vertical furnace suitable for carrying out the method of the present invention, and FIG. 2 is a processing flow diagram of converter slag and dust.
Claims (1)
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、ニッケ
ル源、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ク
ロム酸化物および（または）ニッケル酸化物を含有する
粉状材料を炉内に供給することにより、該粉状材料中の
酸化物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、 炉頂の該原料装入口から装入するクロム源の一部または
全部を塊状のステンレス製鋼スラグとすることを特徴と
するステンレスベースメタルの製造法。 ２）該上段羽口から炉内に供給する粉状材料の一部また
は全部がステンレス鋼製造時に発生するスラジダストお
よび（または）スラグ粉であることを特徴とする請求項
１記載のステンレスベースメタルの製造法。[Claims] 1) When 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 lower part of the furnace, A chromium source, a nickel source, an iron source, a carbon material, and a slag material are charged from the inlet, and high-temperature oxygen-enriched air is blown from the upper and lower tuyeres. At the same time, chromium oxide and/or nickel are charged from the upper tuyere. A method for producing chromium-containing hot metal by supplying powdered material containing oxides into a furnace while melting and reducing the oxides in the powdered material, the method comprising charging from the raw material charging port at the top of the furnace. A method for producing stainless steel base metal, characterized in that part or all of the chromium source is made of lumpy stainless steel slag. 2) A stainless steel base metal according to claim 1, characterized in that part or all of the powdered material supplied into the furnace from the upper tuyere is sludge dust and/or slag powder generated during stainless steel manufacturing. Manufacturing method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63121872A JPH01294812A (en) | 1988-05-20 | 1988-05-20 | Production of base metal for stainless steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63121872A JPH01294812A (en) | 1988-05-20 | 1988-05-20 | Production of base metal for stainless steel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01294812A true JPH01294812A (en) | 1989-11-28 |
Family
ID=14822016
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63121872A Pending JPH01294812A (en) | 1988-05-20 | 1988-05-20 | Production of base metal for stainless steel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01294812A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62167809A (en) * | 1986-01-20 | 1987-07-24 | Nisshin Steel Co Ltd | Production of molten chromium iron |
| JPS62167808A (en) * | 1986-01-20 | 1987-07-24 | Nisshin Steel Co Ltd | Production of molten chromium iron |
-
1988
- 1988-05-20 JP JP63121872A patent/JPH01294812A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62167809A (en) * | 1986-01-20 | 1987-07-24 | Nisshin Steel Co Ltd | Production of molten chromium iron |
| JPS62167808A (en) * | 1986-01-20 | 1987-07-24 | Nisshin Steel Co Ltd | Production of molten chromium iron |
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