JP6435026B2 - Reducing agent reduction method during refining of stainless steel - Google Patents
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- 239000003638 chemical reducing agent Substances 0.000 title claims description 38
- 238000000034 method Methods 0.000 title claims description 28
- 229910001220 stainless steel Inorganic materials 0.000 title claims description 25
- 239000010935 stainless steel Substances 0.000 title claims description 25
- 238000007670 refining Methods 0.000 title claims description 23
- 229910052799 carbon Inorganic materials 0.000 claims description 49
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 45
- 239000002893 slag Substances 0.000 claims description 38
- 239000002131 composite material Substances 0.000 claims description 28
- 238000005261 decarburization Methods 0.000 claims description 25
- 229910052751 metal Inorganic materials 0.000 claims description 24
- 239000002184 metal Substances 0.000 claims description 24
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 13
- 229910052760 oxygen Inorganic materials 0.000 claims description 13
- 239000001301 oxygen Substances 0.000 claims description 13
- 229910000831 Steel Inorganic materials 0.000 claims description 12
- 239000010959 steel Substances 0.000 claims description 12
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 11
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 11
- 150000002739 metals Chemical class 0.000 claims description 10
- 239000007789 gas Substances 0.000 claims description 9
- 238000007664 blowing Methods 0.000 claims description 7
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims description 7
- 239000010436 fluorite Substances 0.000 claims description 7
- 238000007667 floating Methods 0.000 claims description 6
- 229910004261 CaF 2 Inorganic materials 0.000 claims description 5
- 239000002699 waste material Substances 0.000 claims description 4
- 239000004484 Briquette Substances 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims 1
- 238000006722 reduction reaction Methods 0.000 description 21
- 239000011651 chromium Substances 0.000 description 19
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 15
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 9
- 229910005347 FeSi Inorganic materials 0.000 description 9
- 229910052804 chromium Inorganic materials 0.000 description 9
- 235000012255 calcium oxide Nutrition 0.000 description 8
- 239000000292 calcium oxide Substances 0.000 description 8
- 230000009257 reactivity Effects 0.000 description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 230000003628 erosive effect Effects 0.000 description 6
- 238000003723 Smelting Methods 0.000 description 4
- 239000000306 component Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 description 3
- 229910000423 chromium oxide Inorganic materials 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000006467 substitution reaction Methods 0.000 description 3
- 239000003575 carbonaceous material Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 239000010459 dolomite Substances 0.000 description 1
- 229910000514 dolomite Inorganic materials 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/068—Decarburising
- C21C7/0685—Decarburising of stainless steel
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0025—Adding carbon material
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/072—Treatment with gases
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
-
- 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
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- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Treatment Of Steel In Its Molten State (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Description
本発明は、ステンレス鋼精錬時の還元剤低減方法に係り、より詳しくは、ステンレス鋼の脱炭酸精錬時に最終スラグ中の有価金属の回収のために投入する還元剤の量を画期的に低減すると共に酸化された有価金属を回収し得るステンレス鋼精錬時の還元剤低減方法に関する。 The present invention relates to a method for reducing a reducing agent during refining of stainless steel. More specifically, the amount of reducing agent introduced for recovering valuable metals in final slag during decarbonation refining of stainless steel is dramatically reduced. In addition, the present invention relates to a method for reducing a reducing agent during refining of stainless steel that can collect valuable metal that has been oxidized.
ステンレス鋼は、スクラップを電気炉で溶解して精錬した後鋳造する方式で生産され、前記溶解及び精錬過程では脱炭のために高圧の酸素を吹き込むが、吹き込まれる酸素により酸素親和力の強いクロムが酸化されて多量のクロム酸化物がスラグ内に流入する。
特に、スラグに含有されたクロム酸化物は、スラグの流動性を減少させて溶湯からスラグの分離を難しくするだけでなく、ステンレス鋼の核心成分であり且つ有価金属であるクロムの消費量を増加させてステンレス鋼の生産原価を上昇させ、重金属であるクロムによる環境汚染の問題もあるため、クロムの回収は非常に重要になる。
Stainless steel is produced by a method in which scrap is melted and refined in an electric furnace and then cast. In the melting and refining process, high-pressure oxygen is blown for decarburization. Oxidized and a large amount of chromium oxide flows into the slag.
In particular, chromium oxide contained in slag not only reduces the fluidity of slag and makes it difficult to separate slag from the molten metal, but also increases the consumption of chromium, which is a core component of stainless steel and a valuable metal. Therefore, the production cost of stainless steel is raised, and there is also a problem of environmental pollution due to chromium, which is a heavy metal, so that the recovery of chromium becomes very important.
一般的に、ＡＯＤまたはＶＯＤの精錬炉工程でステンレス鋼を製造するとき、脱炭反応のために供給する酸素は、溶鋼中のクロムまたは鉄などと反応してスラグを作り、脱炭反応の終了後、これらクロム、鉄などの酸化物は、Ａｌ、ＳｉまたはＴｉなどのような還元剤を添加してクロム、鉄などの有価金属を回収する。従来は、還元剤として高価のＦｅＳｉまたはＡｌを投入することで製造原価が上昇する問題があった。
また、高価な還元剤の代わりに、Ｃ系還元剤を使用する既存技術として、日本公開特許公報第１９９８−０２５５０７号に、クロム鉱石の溶融還元時に炭材を利用して還元する方法が開示されている。しかし、この技術は、炭材をそのまま使用することで脱炭終点の高融点スラグとの反応性が落ちて溶鋼中への炭素ピックアップが発生する問題があった。
In general, when stainless steel is produced in the AOD or VOD refining furnace process, the oxygen supplied for the decarburization reaction reacts with chromium or iron in the molten steel to form slag, and the decarburization reaction ends. Thereafter, these oxides such as chromium and iron collect a valuable metal such as chromium and iron by adding a reducing agent such as Al, Si or Ti. Conventionally, there has been a problem that the manufacturing cost is increased by introducing expensive FeSi or Al as a reducing agent.
In addition, as an existing technique using a C-based reducing agent instead of an expensive reducing agent, Japanese Published Patent Publication No. 1998-025507 discloses a method of reducing using a carbonaceous material at the time of smelting reduction of chromium ore. ing. However, this technique has a problem in that the carbon pick-up into the molten steel occurs because the reactivity with the high melting point slag at the decarburization end point is lowered by using the carbon material as it is.
前記問題点を解決するための本発明が目的とするところは、スラグとの反応性を高めると共に溶鋼への炭素ピックアップを最小にして品質に影響を及ぼさないで効率的にスラグ中の有価金属を回収するために、ステンレス鋼の脱炭中、または脱炭終了後に有価金属を含有しているスラグに炭素を含有する複合材料を投入して還元を促進するステンレス鋼精錬時の還元剤低減方法を提供することである。 The purpose of the present invention to solve the above problems is to increase the reactivity with the slag and minimize the carbon pickup to the molten steel so that the valuable metals in the slag can be efficiently removed without affecting the quality. In order to recover, a reducing agent reduction method during refining of stainless steel that promotes reduction by introducing a composite material containing carbon into slag containing valuable metals during or after the decarburization of stainless steel Is to provide.
本発明のステンレス鋼精錬時の還元剤低減方法は、酸素を吹き込んで炭素を除去する脱炭段階及び還元剤を投入して有価金属を還元させる還元段階を含むステンレス鋼の精錬工程において、前記還元剤の投入の前に溶鋼上に浮遊しながらスラグと反応する炭素含有複合材料を投入することを特徴とする。 The method for reducing a reducing agent during refining of stainless steel according to the present invention includes a decarburization step of blowing oxygen to remove carbon and a refining step of stainless steel including a reduction step of reducing valuable metal by introducing a reducing agent. A carbon-containing composite material that reacts with slag while floating on the molten steel is charged before the agent is charged.
前記炭素含有複合材料は、ＭｇＯ−Ｃ、ＣａＯ−ＭｇＯ−Ｃ、Ａｌ２Ｏ３−Ｃ及びＳｉＯ２−Ｃのうちいずれか一つを含むことを特徴とする。 The carbon-containing composite material includes any one of MgO—C, CaO—MgO—C, Al 2 O 3 —C, and SiO 2 —C.
前記ＭｇＯ−ＣまたはＣａＯ−ＭｇＯ−Ｃ炭素含有複合材料は、廃耐火物を利用する。 The MgO—C or CaO—MgO—C carbon-containing composite material uses waste refractory.
前記ＣａＯ−Ｃ、Ａｌ２Ｏ３−ＣまたはＳｉＯ２−Ｃ炭素含有複合材料は、前記スラグ内に存在する酸化物と炭素を混合成形したブリケット（ｂｒｉｑｕｅｔｔｅ）を利用することを特徴とする。 The CaO—C, Al 2 O 3 —C or SiO 2 —C carbon-containing composite material is characterized by using a briquette obtained by mixing and molding an oxide and carbon present in the slag.
前記炭素含有複合材料は、前記脱炭段階の中間または完了時に投入することを特徴とする。 The carbon-containing composite material is introduced in the middle or at the completion of the decarburization step.
前記還元段階は、還元剤または蛍石を一部投入してＡｒガスで底吹撹拌することを特徴とする。 The reducing step is characterized in that a reducing agent or fluorite is partially added and bottom-blown with Ar gas.
本発明によれば、高価の還元剤の使用量を減らすことで製造原価が節減できる。
また、炭素含有複合材料が有価金属と反応しＣＯガスを生成して大気中に消え去るため、スラグ量が低減できスラグ処理費用が節減でき、低減されたスラグ量により耐火物の侵食も低減できる。
また、既存還元剤の置換反応と異なり、ＳｉＯ２やＡｌ２Ｏ３が発生しないので、耐火物の侵食を抑制するための塩基度調節用追加の生石灰投入をする必要がなく、製造原価を一層節減できる。
さらに、炭素含有複合材料は、溶鋼中に浮遊して有価金属と反応することでスラグと反応性が高く、鋼中への炭素ピックアップが低減できる。
According to the present invention, the manufacturing cost can be reduced by reducing the amount of expensive reducing agent used.
In addition, since the carbon-containing composite material reacts with valuable metals to generate CO gas and disappears into the atmosphere, the amount of slag can be reduced and the slag treatment cost can be reduced, and the erosion of the refractory can be reduced by the reduced amount of slag.
Also, unlike the substitution reaction of the existing reducing agent, no SiO 2 or Al 2 O 3 is generated, so there is no need to add additional quick lime for adjusting the basicity in order to suppress erosion of the refractory, further increasing the manufacturing cost. You can save.
Further, the carbon-containing composite material is highly reactive with slag by floating in the molten steel and reacting with valuable metals, and carbon pickup into the steel can be reduced.
本発明のステンレス鋼精錬時の還元剤低減方法では、酸素を吹き込んで炭素を除去する脱炭段階及び還元剤を投入して有価金属を還元させる還元段階を含むステンレス鋼の精錬工程において、前記還元剤の投入の前に溶鋼上に浮遊しながらスラグと反応する炭素含有複合材料を投入する。 In the method for reducing a reducing agent during refining of stainless steel according to the present invention, in the refining process of stainless steel including a decarburizing step of removing oxygen by blowing oxygen and a reducing step of reducing a valuable metal by introducing a reducing agent, the reduction The carbon-containing composite material that reacts with the slag while floating on the molten steel is charged before the agent is charged.
以下、本発明の実施例について添付図面を参照しながら詳細に説明する。
本発明は、ステンレス鋼の脱炭中、あるいは脱炭終了後に有価金属を含有しているスラグに炭素を含有する物質を投入してクロム酸化物を含む有価金属の還元を促進する技術である。このとき、流動性を付与することができる蛍石（ＣａＦ２）のような物質を投入するか、ＦｅＳｉ及び／またはＡｌを一部投入して液状率を高めることで反応性を高めることを特徴とする。炭素を含有する物質は、単純に炭素のみを含むものではなく、溶鋼上に浮遊しながらスラグと反応性を維持できるようにスラグ成分を一緒に含むことを特徴とする。
本発明の一実施例によるステンレス鋼精錬時の還元剤低減方法では、酸素を吹き込んで炭素を除去する脱炭段階及び還元剤を投入して有価金属を還元させる還元段階を含むステンレス鋼の精錬工程において、還元剤の投入前に炭素（Ｃ）含有複合材料を投入する。
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
The present invention is a technique for promoting reduction of valuable metals including chromium oxide by introducing a carbon-containing substance into slag containing valuable metals during or after the decarburization of stainless steel. At this time, it is characterized by increasing the reactivity by introducing a substance such as fluorite (CaF 2 ) capable of imparting fluidity or by partially introducing FeSi and / or Al to increase the liquid ratio. And The carbon-containing material is not simply composed of carbon but is characterized by including a slag component together so that the reactivity with the slag can be maintained while floating on the molten steel.
In the method for reducing a reducing agent during refining of stainless steel according to an embodiment of the present invention, a refining process for stainless steel including a decarburization step for removing carbon by blowing oxygen and a reduction step for reducing valuable metals by introducing a reducing agent. The carbon (C) -containing composite material is charged before the reducing agent is charged.
図１は、従来及び本発明の一実施例による有価金属の還元反応を比較して示した模式図である。
図１に示す通り、従来はＦｅＳｉなどの高価な還元剤を投入することでスラグ中の有価金属であるＣｒ２Ｏ３を還元していたが、本発明では、炭素含有複合材料を投入することでスラグ中のＣｒ２Ｏ３を還元する。本発明による還元剤低減方法での還元反応は、有価金属であるＣｒ２Ｏ３と置換反応により還元することではなく、炭素含有複合材料の炭素（Ｃ）が酸素と反応して一酸化炭素（ＣＯ）ガスを生成し、前記ガスは、精錬炉の排気ガス集塵機により収去される。したがって、置換反応による反応生成物であるＡｌ２Ｏ３またはＳｉＯ２が多量発生せず、スラグ量が低減できる。スラグ量の低減によって、耐火物の侵食低減及び塩基度（ＣａＯ／ＳｉＯ２またはＣａＯ／Ａｌ２Ｏ３）調節のための生石灰投入量の低減が期待できる。
FIG. 1 is a schematic view showing a comparison of a reduction reaction of a valuable metal according to one example of the prior art and the present invention.
As shown in FIG. 1, conventionally, an expensive reducing agent such as FeSi was introduced to reduce Cr 2 O 3 which is a valuable metal in the slag, but in the present invention, a carbon-containing composite material is introduced. To reduce Cr 2 O 3 in the slag. The reduction reaction in the reducing agent reducing method according to the present invention is not reduction by substitution reaction with Cr 2 O 3 which is a valuable metal, but carbon (C) of the carbon-containing composite material reacts with oxygen to produce carbon monoxide ( CO) gas is generated, and the gas is removed by an exhaust gas dust collector of the smelting furnace. Therefore, a large amount of Al 2 O 3 or SiO 2 which is a reaction product by the substitution reaction is not generated, and the amount of slag can be reduced. By reducing the amount of slag, it is possible to expect a reduction in erosion of the refractory and a reduction in the amount of quicklime for adjusting the basicity (CaO / SiO 2 or CaO / Al 2 O 3 ).
このとき、炭素含有複合材料が重要であるが、単純に炭素のみを含有する場合には、スラグとの反応性が低く、むしろ鋼中に容易に溶解して入るので、鋼中へのピックアップが発生する問題がある。これを抑制するため、炭素以外にスラグに溶解されて入り、且つ溶鋼上に浮遊しながらスラグ中のＣｒ２Ｏ３と持続的に反応する適正比重を有することが重要である。したがって、スラグ成分であるＣａＯ、ＭｇＯ、Ａｌ２Ｏ３またはＳｉＯ２を炭素と一緒に使用することが好ましい。
炭素含有複合材料は、ＭｇＯ−Ｃ、ＣａＯ−ＭｇＯ−Ｃ、Ａｌ２Ｏ３−Ｃ及びＳｉＯ２−Ｃのうちいずれか一つを含む。ＭｇＯ−ＣまたはＣａＯ−ＭｇＯ−Ｃは、廃耐火物を利用して経済的に使用でき、任意に、Ａｌ２Ｏ３またはＳｉＯ２を炭素と一緒に成形してブリケット（ｂｒｉｑｕｅｔｔｅ）の形態で使用する。これは、スラグ組成によって弾力的に決定できる。
At this time, the carbon-containing composite material is important. However, when only carbon is contained, the reactivity with the slag is low, and rather it is easily dissolved in the steel. There are problems that occur. In order to suppress this, it is important to have an appropriate specific gravity that dissolves and enters the slag other than carbon and continuously reacts with Cr 2 O 3 in the slag while floating on the molten steel. Therefore, it is preferable to use CaO, MgO, Al 2 O 3 or SiO 2 which is a slag component together with carbon.
The carbon-containing composite material includes any one of MgO—C, CaO—MgO—C, Al 2 O 3 —C, and SiO 2 —C. MgO-C or CaO-MgO-C is economical to use and use of waste refractory, optionally, used in the form of briquettes (briquette) by molding the Al 2 O 3 or SiO 2 together with the carbon To do. This can be elastically determined by the slag composition.
炭素含有複合材料は、精錬炉脱炭段階の中間または完了時に投入する。通常、脱炭の中間に発生するスラグは、Ｃｒ２Ｏ３により固相を維持しているため、炭素含有複合材料を投入しても反応性が高くない。しかし、脱炭段階の終了時に、蛍石（ＣａＦ２）やＦｅＳｉまたはＡｌなどの還元剤を一部投入する時点からＣｒ２Ｏ３などの有価金属と炭素含有複合材料が反応するようになる。
図２及び図３は、従来の発明と本発明による脱炭及び還元段階を比較して示した工程図である。
従来の精錬工程の場合、溶銑装入後に酸素を吹錬しながら脱炭する。このとき、酸素吹錬によって発生するＳｉＯ２成分による耐火物侵食を抑制するために、副原料として生石灰（ＣａＯ）及び軽焼ドロマイト（ＣａＯ・ＭｇＯ）を投入する。以後、酸素吹錬により酸化された有価金属を還元するために還元剤（Ａｌ、ＦｅＳｉ）と蛍石（ＣａＦ２）を投入し、底吹でＡｒガスを吹き込んで撹拌する。一定時間後に溶鋼を出鋼する。
The carbon-containing composite material is introduced during or at the completion of the smelting furnace decarburization stage. Usually, the slag generated in the middle of decarburization maintains a solid phase with Cr 2 O 3, so that the reactivity is not high even when a carbon-containing composite material is introduced. However, at the end of the decarburization step, the valuable metal such as Cr 2 O 3 and the carbon-containing composite material react with each other from the time when a reducing agent such as fluorite (CaF 2 ), FeSi, or Al is partially added.
2 and 3 are process diagrams showing a comparison of the decarburization and reduction steps according to the conventional invention and the present invention.
In the case of the conventional refining process, decarburization is performed while oxygen is blown after the molten metal is charged. At this time, quick lime (CaO) and light calcined dolomite (CaO · MgO) are added as auxiliary materials in order to suppress refractory erosion by the SiO 2 component generated by oxygen blowing. Thereafter, a reducing agent (Al, FeSi) and fluorite (CaF 2 ) are introduced in order to reduce valuable metals oxidized by oxygen blowing, and Ar gas is blown into the bottom and stirred. The molten steel is produced after a certain time.
一方、本発明による精錬工程では、溶銑装入、酸素吹錬、脱炭及び副原料の投入に追加して脱炭段階で炭素含有複合材料を投入する。炭素含有複合材料は、脱炭段階の中間に投入するか、脱炭段階の終了時に投入してもよい。
以後、還元段階では、先に還元剤（Ａｌ、ＦｅＳｉ）と蛍石（ＣａＦ２）を一部投入し、底吹でＡｒガスを吹き込んで撹拌する。前記還元剤及び蛍石を一部投入することで、先に投入された炭素含有複合材料のスラグとの反応性を高めて且つ液状率が確保できる。一定時間炭素含有複合材料による還元反応が進行した後に、スラグ内に残存するＣｒ２Ｏ３を全量還元するために還元剤（Ａｌ、ＦｅＳｉ）を投入し、底吹でＡｒガスを吹き込んで撹拌する。
On the other hand, in the refining process according to the present invention, the carbon-containing composite material is introduced at the decarburization stage in addition to the hot metal charging, oxygen blowing, decarburization, and the addition of auxiliary materials. The carbon-containing composite material may be introduced in the middle of the decarburization stage or at the end of the decarburization stage.
Thereafter, in the reduction stage, a reducing agent (Al, FeSi) and fluorite (CaF 2 ) are partly charged first, and Ar gas is blown into the bottom and stirred. By introducing a part of the reducing agent and fluorite, the reactivity with the slag of the carbon-containing composite material that has been previously added can be increased and a liquid ratio can be secured. After the reduction reaction with the carbon-containing composite material proceeds for a certain period of time, a reducing agent (Al, FeSi) is added to reduce the total amount of Cr 2 O 3 remaining in the slag, and Ar gas is blown into the bottom and stirred. .
以下、実施例を通じて本発明を具体的に説明する。
実施例
ステンレス溶銑を精錬炉に装入した後、酸素を吹錬して脱炭を実施した。脱炭終了時点で炭素含有複合材料を投入し、続いて、還元剤（Ａｌ、ＦｅＳｉ）を投入した。Ｃｒ２Ｏ３の還元反応の終了後、還元剤の投入量、精錬炉の耐火物溶損量及びクロム（Ｃｒ）の実収率を測定し、下記表１に示した。
Example After putting stainless steel hot metal into a refining furnace, oxygen was blown and decarburization was performed. At the end of decarburization, a carbon-containing composite material was charged, and subsequently, a reducing agent (Al, FeSi) was charged. After completion of the reduction reaction of Cr 2 O 3, the amount of reducing agent added, the refractory refractory erosion amount of the smelting furnace, and the actual yield of chromium (Cr) were measured and are shown in Table 1 below.
本発明のステンレス鋼精錬時の還元剤低減方法は、高速脱炭時に発生するＣｒ２Ｏ３の還元費用が節減でき、発生スラグ量を減らすことでスラグ埋め立て費用を節減し得る。 The reducing agent reduction method during refining of stainless steel according to the present invention can reduce the reduction cost of Cr 2 O 3 generated during high-speed decarburization, and can reduce the slag landfill cost by reducing the amount of generated slag.
以上、本発明に関する好ましい実施例を説明したが、本発明は前記実施形態に限定されるものではなく、本発明の属する技術分野を逸脱しない範囲での全ての変更が含まれる。
As mentioned above, although the preferable Example regarding this invention was described, this invention is not limited to the said embodiment, All the changes in the range which does not deviate from the technical field to which this invention belongs are included.
Claims (5)
前記還元剤の投入の前に溶鋼上に浮遊しながらスラグと反応する炭素含有複合材料を投入し、
前記炭素含有複合材料は、ＭｇＯ−Ｃ、ＣａＯ−ＭｇＯ−Ｃ、Ａｌ ２ Ｏ ３ −Ｃ及びＳｉＯ ２ −Ｃのうちいずれか一つを含むことを特徴とするステンレス鋼精錬時の還元剤低減方法。 In the refining process of stainless steel, which includes a decarburization stage in which oxygen is blown to remove carbon and a reduction stage in which a reducing agent is added to reduce valuable metals,
Prior to the introduction of the reducing agent, the carbon-containing composite material that reacts with the slag while floating on the molten steel is introduced ,
The carbon-containing composite material includes any one of MgO—C, CaO—MgO—C, Al 2 O 3 —C, and SiO 2 —C, and a reducing agent reducing method during refining of stainless steel, .
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