JPS63241107A - Converter steel making method - Google Patents
Converter steel making methodInfo
- Publication number
- JPS63241107A JPS63241107A JP62073997A JP7399787A JPS63241107A JP S63241107 A JPS63241107 A JP S63241107A JP 62073997 A JP62073997 A JP 62073997A JP 7399787 A JP7399787 A JP 7399787A JP S63241107 A JPS63241107 A JP S63241107A
- Authority
- JP
- Japan
- Prior art keywords
- converter
- melting
- molten iron
- scrap
- refining
- 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.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000009628 steelmaking Methods 0.000 title claims description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 154
- 229910052742 iron Inorganic materials 0.000 claims abstract description 77
- 238000002844 melting Methods 0.000 claims abstract description 56
- 230000008018 melting Effects 0.000 claims abstract description 53
- 238000007670 refining Methods 0.000 claims abstract description 37
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 36
- 239000001301 oxygen Substances 0.000 claims abstract description 36
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 36
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 30
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 24
- 238000004519 manufacturing process Methods 0.000 claims abstract description 15
- 239000003575 carbonaceous material Substances 0.000 claims abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 27
- 229910000831 Steel Inorganic materials 0.000 claims description 25
- 239000010959 steel Substances 0.000 claims description 25
- 238000007664 blowing Methods 0.000 claims description 19
- 239000000463 material Substances 0.000 claims description 16
- 239000002184 metal Substances 0.000 claims description 13
- 229910052751 metal Inorganic materials 0.000 claims description 13
- 239000002994 raw material Substances 0.000 claims description 4
- 238000003723 Smelting Methods 0.000 claims description 2
- 238000010079 rubber tapping Methods 0.000 abstract description 6
- 238000010000 carbonizing Methods 0.000 abstract 1
- 239000003245 coal Substances 0.000 description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000010309 melting process Methods 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- 229910052717 sulfur Inorganic materials 0.000 description 3
- 239000011593 sulfur Substances 0.000 description 3
- 229910000805 Pig iron Inorganic materials 0.000 description 2
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 239000000571 coke Substances 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000011261 inert gas Substances 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 238000005255 carburizing Methods 0.000 description 1
- 239000012159 carrier gas Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005261 decarburization Methods 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 230000003009 desulfurizing effect Effects 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000001294 propane Substances 0.000 description 1
- 238000000197 pyrolysis Methods 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Classifications
-
- 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
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は冷銑或いはスクラップ等の固形含鉄冷材を多量
に用いて溶解し、そしてこれを転炉で酸素吹錬する製鋼
法に関するものである。[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a steel manufacturing method in which a large amount of solid iron-containing cold material such as cold pig iron or scrap is melted and then oxygen-blown in a converter. be.
（従来の技術）
一般的な転炉の精錬は、高炉から供給される溶銑を主原
料とし、これに相対的には少量のスクラップを加え、造
さい剤と高流量の酸素を供給して酸素吹錬を行うのが普
通である。この常法の場合、熱源による制約から全装入
原料に占めるスクラップの量は、最大３５％であって、
スクラップが多量に使用できる方法とはいえない。(Conventional technology) In general converter refining, the main raw material is hot metal supplied from a blast furnace, a relatively small amount of scrap is added to it, and a sizing agent and a high flow rate of oxygen are supplied to produce oxygen. It is common to perform blowing. In the case of this conventional method, the amount of scrap in the total raw material charge is at most 35% due to restrictions due to the heat source.
This is not a method that can use a large amount of scrap.
この点について、従来、大半がスクラップや冷銑である
多量の含鉄冷材を使用して転炉の精錬を行う製鋼法とし
て、特公昭６０−３４６０５号で提案されているような
酸素上吹装置及び炉底に設置された炭材導入ノズルを同
時に備える酸素上底吹転炉を用いてスクラップから１ヒ
ート当たり１０〜３０％相当量の余分の溶鋼を精錬し、
その余分の溶鋼を次ヒート用種湯として炉内に残留させ
て、次ヒートのスクラップの装入、精錬を行うものがあ
る。Regarding this point, conventionally, as a steelmaking method that uses a large amount of iron-containing cold material, most of which is scrap or cold pig iron, for refining in a converter, an oxygen top blowing device as proposed in Japanese Patent Publication No. 60-34605 has been proposed. and smelting excess molten steel equivalent to 10 to 30% per heat from scrap using an oxygen top-bottom blowing furnace simultaneously equipped with a carbon material introduction nozzle installed at the bottom of the furnace,
There is a method in which the excess molten steel is left in the furnace as a seed metal for the next heat, and the scrap is charged and refined for the next heat.
しかしこの方法は、同一転炉を使って溶解と精錬を行い
、そして残留溶鋼を種湯として順次使いつぐ方法であり
、そのため、
■多量に使用する石炭又はコークス等の炭材中の硫黄分
が溶鋼に入る。However, this method uses the same converter for melting and refining, and then sequentially uses the remaining molten steel as seed water. Therefore, the sulfur content in the large amount of coal or coke used is reduced. Enter the molten steel.
■スクラップの溶解から脱炭精錬まで広範囲の温度変化
があり、そして出鋼段階では高温度になるので耐火物寿
命が短い。■There is a wide range of temperature changes from scrap melting to decarburization refining, and the high temperature during the tapping stage shortens the life of refractories.
■溶解から吹錬終了まで略連続的に精錬するので長時間
となり、そのため底吹き羽口保護（冷却）のために使用
するプロパン等からの熱分解水素が溶鋼中により多く吸
収される。■Since refining is conducted almost continuously from melting to the end of blowing, it takes a long time, and as a result, more pyrolysis hydrogen from propane, etc. used to protect (cool) the bottom blowing tuyere is absorbed into the molten steel.
という欠点があると言われている。It is said that there is a drawback.
このような欠点を解決するとして、特開昭６０−１７４
８１２号が提案されている。この提案方法は、含鉄冷材
を種湯を使って溶解する工程と、上記溶解物を精錬する
工程を別々の転炉で実施することにより上記欠点■〜■
を解消しようというものであり、機能の異なる２種の転
炉を用い、種湯の存在する一方の転炉（溶解専用転炉）
に含鉄冷材、炭材、酸素を供給して高炭素溶融鉄を得、
この溶融鉄を別の転炉（精錬専用転炉）で酸素吹錬する
ことにより所要成分の溶鋼を得ることを基本的特徴とし
、具体的には種湯存在下の溶解専用転炉内に含鉄冷材、
炭材、酸素を供給して含鉄冷材を溶解させて高炭素溶融
鉄を得て、溶解専用転炉を倒炉させて、その溶融鉄の一
部を取鍋に抜き取り、溶融鉄の残部を種湯として残留さ
せた溶解専用転炉内に再び含鉄冷材、炭材、酸素を供給
して含鉄冷材を溶解させて高炭素溶融鉄を得て、再び溶
解専用転炉を倒炉させて、その溶融鉄の一部を上記取鍋
に抜き取る操作を繰り返すこと、及び最終的に溶解専用
転炉内の高炭素溶融鉄を全量、前記取鍋とは異なる取鍋
に排出することにより精錬及び種湯に必要な量の高炭素
溶融鉄を得る。To solve these drawbacks, Japanese Patent Application Laid-Open No. 60-174
No. 812 has been proposed. This proposed method solves the above-mentioned drawbacks by performing the process of melting the iron-containing cold material using seed water and the process of refining the melted material in separate converters.
The idea is to solve this problem by using two types of converters with different functions, one of which has seed water (a converter exclusively for melting).
to obtain high carbon molten iron by supplying iron-containing cold material, carbon material, and oxygen to
The basic feature is to obtain molten steel with the required composition by oxygen blowing this molten iron in a separate converter (a converter exclusively for refining). cold material,
Carbon material and oxygen are supplied to melt the iron-containing cold material to obtain high-carbon molten iron.The melting converter is then collapsed, a part of the molten iron is extracted into a ladle, and the remaining molten iron is removed. Ferrous cold material, carbonaceous material, and oxygen are again supplied to the melting converter that remains as seed water to melt the iron-containing cold material to obtain high carbon molten iron, and the melting converter is once again collapsed. , repeating the operation of extracting a portion of the molten iron into the ladle, and finally discharging the entire amount of high carbon molten iron in the melting converter into a ladle different from the ladle, thereby refining and Obtain the amount of high carbon molten iron required for the seed bath.
そして取鍋に排出された高炭素溶融鉄は、別の精錬専用
転炉へ装入し、酸素吹錬して常法の製鋼精錬を行い所望
の成分の溶鋼とすると共に一部を次のヒートの操業開始
時の種湯として溶解専用転炉へ還流させる。The high carbon molten iron discharged into the ladle is then charged into a separate converter exclusively for refining, where it is oxygen blown and refined using conventional steelmaking methods to produce molten steel with the desired composition. It is refluxed to the converter exclusively for melting as a seed water at the start of operation.
（発明が解決しようとする問題点）
このように特開昭６０−１７４８１２号提案法は、溶解
専用転炉での次のヒートの操業開始時の種湯量と次の工
程の精錬専用転炉での所要量の合計量の高炭素溶融鉄を
得、溶解専用転炉に還流すると共に精錬専用転炉に供給
するために、溶解専用転炉を複数回（具体的には３回）
の倒炉操作をしなければならず、溶解処理時間が長くな
るという問題点がある。(Problems to be Solved by the Invention) As described above, the method proposed in JP-A-60-174812 has the following problems: In order to obtain the total amount of high carbon molten iron required for , recirculate it to the melting converter and supply it to the refining converter, the melting converter is passed multiple times (specifically, three times).
There is a problem that the melting process time is longer because the furnace must be collapsed.
また次のヒートの操業開始に際しては、上記取鍋内に一
時貯蔵された溶融鉄を種湯として溶解専用転炉内へ装入
しなければならず、更に溶解処理時間が長くなる。Furthermore, when starting the next heat operation, the molten iron temporarily stored in the ladle must be charged into the converter exclusively for melting as seed water, further prolonging the melting process time.
本発明は、上記溶解処理時間を短縮して、溶解能率を向
上させた転炉製鋼法を提供するものである。The present invention provides a converter steel manufacturing method that shortens the above-mentioned melting treatment time and improves melting efficiency.
（問題点を解決するための手段）
本発明の要旨は、種湯の存在する溶解専用転炉に含鉄冷
材、炭材、酸素を供給して高炭素溶融鉄を得、この溶融
鉄を原料として別の精錬専用転炉で酸素吹錬することに
より所要成分の溶鋼を得る転炉製鋼法において、上記溶
解専用転炉において、上記精錬専用転炉での所要精錬量
と溶解専用転炉での所要種湯量の合計量の高炭素溶融鉄
を得、上記溶解専用転炉から上記精錬専用転炉での所要
精錬量の高炭素溶融鉄を１回の出湯にて酸素精錬に供す
る一方、高炭素溶融鉄の残部種湯量を溶解専用転炉に残
して前記含鉄冷材溶解のための種湯として使用すること
を特徴とする転炉製鋼法にある。(Means for Solving the Problems) The gist of the present invention is to obtain high carbon molten iron by supplying iron-containing cold material, carbon material, and oxygen to a melting converter in which a seed metal exists, and to use this molten iron as a raw material. In the converter steel manufacturing method in which molten steel with the required composition is obtained by oxygen blowing in a separate converter exclusively for refining, in the converter exclusively for melting, the required refining amount in the converter exclusively for refining and the amount of refining in the converter exclusively for melting are determined. High-carbon molten iron in the total amount of the required amount of seed hot water is obtained, and the required amount of high-carbon molten iron is refined from the melting-only converter to the refining-only converter in one tap for oxygen refining. A converter steel manufacturing method characterized in that the remaining amount of seed water of molten iron is left in a melting-only converter and used as seed water for melting the iron-containing cold material.
本発明における高炭素溶融鉄とは、炭素含有量２％以上
の溶融鉄である。The high carbon molten iron in the present invention is molten iron with a carbon content of 2% or more.
本発明法によれば、１回の出湯、即ち余剰に溶解した溶
解専用転炉の唯１回の倒炉操作にて精錬専用転炉での所
要量の予備処理溶融鉄が得られ、一方、予備処理溶融鉄
の残部種湯量を溶解専用転炉に残して、前記含鉄冷材溶
解のための種湯とするものであり、上記特開昭６０−１
７４８１２号提案法の溶解工程において、種湯量出湯の
ために必要な２回以上の倒炉操作を皆無ならしめると共
に、次の溶解ヒート開始時の種湯として必要な溶融鉄の
取鍋からの溶解専用転炉内への装入操作が排除され、溶
解処理時間が大幅に減少され、溶解能率が向上するもの
である。According to the method of the present invention, the amount of pre-treated molten iron required for the refining converter can be obtained in one tapping operation, that is, by only one overturning operation of the melting converter in which surplus melt has been made; The remaining amount of seed hot water of the pretreated molten iron is left in the converter exclusively for melting and used as seed hot water for melting the iron-containing cold material, and is disclosed in JP-A-60-1 mentioned above.
In the melting process of the method proposed in No. 74812, it eliminates the need for overturning the furnace more than once to produce the seed metal, and also melts the molten iron required as the seed metal at the start of the next melting heat from the ladle. The charging operation into a dedicated converter is eliminated, the melting processing time is significantly reduced, and the melting efficiency is improved.
また本発明によれば、種湯貯蔵用取鍋も不必要であり、
高炭素溶融鉄製造コストを低下することができる。Further, according to the present invention, a ladle for storing seed water is also unnecessary,
The production cost of high carbon molten iron can be reduced.
なお前記特公昭６０−３４６０５号公報の発明は、本発
明の対象とする機能の異なる２種の転炉を用いる方法と
は異なるものであるが、その実施例表１に種湯存在下の
酸素上底吹転炉内にスクラップ、炭材、酸素を供給する
ことを２回繰り返して、高炭素溶融鉄を得、上記転炉を
倒炉して上記溶融鉄の一部を取鍋に次ヒート用種湯量を
出湯すると共に、残部の溶融鉄が残留する転炉内に新た
にスクラップ、炭材、酸素を供給してスクラップを溶解
させた後、酸素吹錬して所要成分の溶鋼にして全量出鋼
し、上記取鍋内の溶融鉄を出鋼後の転炉内へ種湯として
装入させる方法が開示されており、出鋼以外に種湯出湯
のための倒炉操作が必要で、２回の倒炉操作が必要であ
り、更に次ヒートの操業開始に際して上記取鍋内の溶融
鉄を転炉内へ装入しなければならないので、上記特開昭
６０−１７８１２号と同様にスクラップ溶解精錬処理時
間、特に溶解処理時間が長くなるという欠点をもってい
る。Although the invention disclosed in Japanese Patent Publication No. 60-34605 is different from the method of using two types of converters with different functions, which is the subject of the present invention, Table 1 shows the method of using two types of converters with different functions. The process of supplying scrap, carbonaceous materials, and oxygen into the top-bottom blowing converter is repeated twice to obtain high-carbon molten iron, and the converter is then collapsed and a portion of the molten iron is transferred to the ladle for the next heat. At the same time as the amount of hot water is tapped out, scrap, carbonaceous material, and oxygen are newly supplied into the converter where the remaining molten iron remains to melt the scrap, and then oxygen blowing is performed to convert it into molten steel with the required components. A method is disclosed in which the molten iron in the ladle is charged as seed hot water into the converter after steel tapping, and in addition to tapping, a toppling operation for tapping the seed hot water is required. The furnace operation is required twice, and the molten iron in the ladle must be charged into the converter at the start of the next heat operation. It has the disadvantage that the melting and refining treatment time, especially the melting treatment time, becomes long.
また同公報の実施例表２によれば、種湯を炉内に残す方
式が示されていて、これば倒炉回数としては本発明と同
一であるが、表２によれば、種湯を含めた全量を鋼にま
で精錬しているので、酸素使用量が大きく、製鋼コスト
が高くなる欠点がある。よって、特公昭６０−３４６０
５号と本発明とは異なるものである。Also, according to Example Table 2 of the same publication, a method is shown in which the seed water is left in the furnace, and the number of times the furnace is toppled is the same as the present invention, but according to Table 2, the seed water is left in the furnace. Since the entire amount including steel is refined into steel, there is a disadvantage that the amount of oxygen used is large and the steel manufacturing cost is high. Therefore, the special public official 1986-3460
No. 5 and the present invention are different.
また特開昭５９−２３８０８号により、繰り返しサイク
ルと称する種湯溶解専用工程と、製造サイクルと称する
溶鋼への精錬工程を有し、上記繰り返しサイクルによっ
て得、出銑した２つの種湯を、１つは次の繰り返しサイ
クルに、他の１つは製造サイクルに供することが提案さ
れている。そして、そのさい種湯はスクラップ等の含鉄
冷材の上から上注ぎされていることが示されている。こ
れに対して、本発明法は、種湯は溶解専用転炉に残留さ
せること、含鉄冷材から一気に溶鋼に精錬する所謂製造
サイクルをもたないこと、等、上記特開昭５９−２３８
０８号とは根本的に異なるものである。In addition, according to Japanese Patent Application Laid-open No. 59-23808, it has a process dedicated to melting the seed metal called a repeat cycle and a process of refining it into molten steel called a manufacturing cycle, and the two seed metals obtained and tapped by the above repeat cycle are It is proposed that one be subjected to the next repeat cycle and the other to the manufacturing cycle. It is also shown that the hot water is poured over iron-containing cold materials such as scrap. In contrast, the method of the present invention requires the seed metal to remain in the converter exclusively for melting, does not have the so-called production cycle of refining iron-containing cold material into molten steel all at once, etc.
This is fundamentally different from No. 08.
以下、本発明を図面により詳細に説明する。Hereinafter, the present invention will be explained in detail with reference to the drawings.
第１図は本発明法を示す工程図であり、１は溶解専用転
炉で、例えば酸素上吹ランス２を有し、炉底に羽口３を
有し、石炭、コークス等の炭材を非酸化性搬送ガス（例
えば窒素ガス）と共に吹き込むと共に酸素及び冷却用の
非酸化性ガス（例えばＬＰＧ）を吹き込むことができる
ように構成された酸素上底吹転炉である。４は別の精錬
専用転炉で、例えば酸素上吹ランス５を有し、炉底に炉
内の溶融鉄攪はん用不活性ガス、例えば二酸化炭素を吹
き込む羽口６を有する酸素上吹、不活性ガス底吹転炉で
ある。Fig. 1 is a process diagram showing the method of the present invention, in which 1 is a converter exclusively for melting, which has, for example, an oxygen top-blowing lance 2 and a tuyere 3 at the bottom of the furnace, and is capable of handling carbonaceous materials such as coal and coke. This is an oxygen top-bottom blown converter that is configured so that it can be blown in with a non-oxidizing carrier gas (for example, nitrogen gas), as well as oxygen and a non-oxidizing gas for cooling (for example, LPG). 4 is another converter exclusively for refining, which has, for example, an oxygen top blowing lance 5, and an oxygen top blowing furnace having a tuyere 6 at the bottom of the furnace for blowing an inert gas, such as carbon dioxide, for stirring the molten iron in the furnace; This is an inert gas bottom blowing converter.
第１図（ａ）の如く、種湯７ （後述するスクラップを
溶解した高炭素溶融鉄の一部を炉内に残留させたもの）
存在下の転炉１内にスクラップ８を装入し、羽口３より
炭材、酸素を、またランス２より酸素を供給して、スク
ラップ８を加炭溶解する。As shown in Figure 1(a), seed water 7 (a portion of high carbon molten iron obtained by melting scrap described later remains in the furnace)
Scrap 8 is charged into the existing converter 1, and carbon material and oxygen are supplied from the tuyere 3 and oxygen is supplied from the lance 2 to carburize and melt the scrap 8.
上記スクラップが溶解すると、上記種湯７と上記スクラ
ップ溶解物よりなる高炭素溶融鉄中に新たなスクラップ
を装入し、同様に加炭溶解することを複数回、例えば２
回実施し、種湯量と次の精錬専用転炉４での必要量の合
計量の高炭素、例えば炭素含有Ｍ３．５％の溶融鉄を得
る（第１図（ｂ）の状態）。次に第１図（ｅ）のように
溶解専用転炉ｌを倒炉操作して、精錬専用転炉４での必
要ｉｔ（複数回に分けて装入したスクラップの合計量に
相当する！ｄ）の高炭素溶融鉄を取鍋９へ出湯すると共
に高炭素溶融鉄の残部種湯口を溶解専用転炉１内に残し
く第１図（（１）の状態）、次ヒートのスクラップ加炭
溶解のための種湯として使用する。When the scrap is melted, new scrap is charged into the high carbon molten iron made of the seed water 7 and the scrap melt, and the same process of carburizing and melting is repeated several times, for example, 2 times.
The process is repeated twice to obtain molten iron with a high carbon content, for example, a carbon content of M3.5%, which is the total amount of the seed metal and the amount required for the next refining converter 4 (the state shown in FIG. 1(b)). Next, as shown in Fig. 1(e), the melting converter 1 is operated to topple, and the refining converter 4 requires it (corresponding to the total amount of scrap charged in multiple batches!d). ) is tapped into the ladle 9, and the remaining seed sprue of the high carbon molten iron is left in the converter 1 for melting. Use as a seed bath for
取鍋９内に得られた高炭素溶融鉄は、第１図（８）に示
すように精錬専用転炉４に装入して、羽口６より二酸化
炭素ガスを導入して溶融鉄を攪はんしつつ、上吹ランス
５より酸素を供給して脱炭を行って所要成分の溶鋼に精
錬し、第１図（ｆ）のように取鍋【０に出鋼する。The high carbon molten iron obtained in the ladle 9 is charged into a converter 4 exclusively for refining, as shown in FIG. 1 (8), and carbon dioxide gas is introduced through the tuyere 6 to stir the molten iron. While heating, oxygen is supplied from the top blowing lance 5 to decarburize the steel and refine it into molten steel with the required composition, which is then tapped into a ladle 0 as shown in FIG. 1(f).
なお溶解専用転炉ｌで使用する炭材の硫黄含有間が高く
“（、取鍋９に出湯される溶融鉄硫黄含有量が高い場合
、第１図（幻のように、取鍋９内の溶融鉄に脱硫剤を添
加し、例えばインペラー１１で攪はんして脱硫処理し、
この脱硫処理溶融鉄を精錬専用転炉４へ供給することも
できる。In addition, if the sulfur content of the carbon material used in the converter l for melting is high, if the sulfur content of the molten iron discharged into the ladle 9 is high, Adding a desulfurizing agent to molten iron and stirring it with an impeller 11 for desulfurization treatment, for example,
This desulfurized molten iron can also be supplied to the converter 4 exclusively for refining.
また精錬専用転炉４としては、酸素上吹転炉、酸素底吹
転炉、酸素上底吹転炉等を使用することができる。Further, as the refining converter 4, an oxygen top-blowing converter, an oxygen bottom-blowing converter, an oxygen top-bottom blowing converter, or the like can be used.
（実施例）
種湯１ｔ８４１−ン、精錬専用転炉４での必要量１１６
トンの合計１ｔ２００）ンの炭素含有Ｎ３．５％の溶融
鉄を得る際の第１図に示す溶解専用転炉１の操業パター
ン例を第２図に示す。詳しくは、炭素含有ｆｆ１３．５
％の溶融鉄８４トン存在下の上記転炉１にスクラップ２
９トン装入しくスクラップ装入（１） ）、石炭を炉底
羽口３から、酸素を羽口３及びランス２から供給し上記
スクラップを加炭溶解し、１１３トンの溶融鉄を得た。(Example) Seed water: 1 ton, 841 tons, required amount for refining converter 4: 116
FIG. 2 shows an example of the operation pattern of the melting converter 1 shown in FIG. 1 when obtaining a total of 1t200 tons of molten iron containing carbon and N3.5%. For details, see carbon-containing ff13.5
Scrap 2 to the above converter 1 in the presence of 84 tons of molten iron
9 tons of scrap was charged (1)), coal was supplied from the bottom tuyere 3, oxygen was supplied from the tuyere 3 and lance 2, and the scrap was carburized and melted to obtain 113 tons of molten iron.
次いで１１３トンの溶融鉄存在下の転炉１内にスクラッ
プ５８トン装入しくスクラップ装入（ＩＩ） ） 、同
様に石炭を炉底羽口３から、酸素を羽口３及びランス２
から供給し上記スクラップを加炭溶解し、１７１トンの
溶融鉄を得た。次いで１７１トンの溶融鉄存在下の転炉
１内にスクラップ２９トン装入しくスクラップ装入（Ｉ
ＩＩ） ） 、同様に石炭を炉底羽口３から、酸素を羽
口３及びランス２から供給し上記スクラップを加炭溶解
し、炭素含有量３．５％、２００トンの溶融鉄を得た。Next, 58 tons of scrap was charged into the converter 1 in the presence of 113 tons of molten iron (scrap charging (II)), and similarly, coal was charged from the bottom tuyere 3, and oxygen was transferred from the tuyere 3 and lance 2.
The above scrap was carbonized and melted to obtain 171 tons of molten iron. Next, 29 tons of scrap was charged into the converter 1 in the presence of 171 tons of molten iron.
II)) Similarly, coal was supplied from the bottom tuyere 3 and oxygen was supplied from the tuyere 3 and lance 2 to carburize and melt the above scrap to obtain 200 tons of molten iron with a carbon content of 3.5%. .
次いで上記転炉ｌを倒炉して精錬専用転炉４での必要量
１１６トンを取鍋９に出湯し、残部種湯Ｍ８４トンをそ
のまま転炉１内に残して、溶解ヒートサイクルを完了し
た。この溶解ヒートサイクル時間は、６６分であった。Next, the converter 1 was overturned, and the required amount of 116 tons in the refining converter 4 was tapped into the ladle 9, and the remaining seed hot water M84 tons was left in the converter 1 to complete the melting heat cycle. . The dissolution heat cycle time was 66 minutes.
（従来例）
上記実施例と同一のスクラップ装入、酸素、炭材供給条
件で種湯量８４トン、精錬専用転炉４での必要量１１６
トンの合計量２００トンの炭素含有量３．５％の溶融鉄
を得るに際し、上記実施例の第２回目の５８トンのスク
ラップ装入前に倒炉して、得られた溶融鉄の一部、即ち
２９トンを種湯貯蔵用取鍋に出湯し、上記実施例の第３
回目の２９トンのスクラップ装入前に倒炉して、得られ
た溶融鉄の一部５５トンを上記貯蔵取鍋に出湯して取鍋
内に合計８４トンの種湯量を確保し、最終的に転炉１内
に得られた１１６トンの溶融鉄全量を取消に出湯し、次
いで転炉ｌ内に上記種湯貯蔵取鍋より８４トンの溶融鉄
を装入して溶解ヒートサイクルを完了した。この溶解ヒ
ートサイクル時間は、８１分である。(Conventional example) Under the same scrap charging, oxygen, and carbon material supply conditions as in the above example, the amount of seed hot water is 84 tons, and the amount required in the converter 4 for refining is 116 tons.
When obtaining molten iron with a total amount of 200 tons and a carbon content of 3.5%, a part of the molten iron obtained by toppling the furnace before charging 58 tons of scrap in the second time of the above example. , that is, 29 tons of hot water was poured into the ladle for storing seed hot water, and the third
Before charging 29 tons of scrap for the second time, the furnace was collapsed, and a portion of the obtained molten iron (55 tons) was poured into the storage ladle to secure a total amount of 84 tons of seed metal in the ladle. The entire amount of 116 tons of molten iron obtained in converter 1 was discharged, and then 84 tons of molten iron was charged into converter 1 from the seed metal storage ladle to complete the melting heat cycle. . The melting heat cycle time is 81 minutes.
（発明の効果）
以上詳述したように、本発明の転炉製鋼法によれば、溶
解処理能率が向上すると共に溶融鉄製造コストを低下す
ることができる。(Effects of the Invention) As described in detail above, according to the converter steel manufacturing method of the present invention, the melting efficiency can be improved and the cost of manufacturing molten iron can be reduced.
第１図は本発明の製鋼法を示す工程図であり、第２図は
本発明法の一実施例の説明図である。
１・・・溶解専用転炉、４・・・精錬専用転炉、７・・
・種湯、８・・・スクラップ、９，１０・・・取鍋。FIG. 1 is a process diagram showing the steel manufacturing method of the present invention, and FIG. 2 is an explanatory diagram of one embodiment of the method of the present invention. 1... Converter exclusively for melting, 4... Converter exclusively for refining, 7...
・Taneyu, 8...Scrap, 9,10...Ladle.
Claims (1)
供給して高炭素溶融鉄を得、この高炭素溶融鉄を原料と
して別の精錬専用転炉で酸素吹錬することにより所要成
分の溶鋼を得る転炉製鋼法において、上記溶解専用転炉
において、上記精錬専用転炉での所要精錬量と溶解専用
転炉での所要種湯量の合計量の高炭素溶融鉄を得、上記
溶解専用転炉から上記精錬専用転炉での所要精錬量の高
炭素溶融鉄を１回の出湯にて酸素精錬に供する一方、高
炭素溶融鉄の残部種湯量を溶解専用転炉に残して前記含
鉄冷材溶解のための種湯として使用することを特徴とす
る転炉製鋼法。High-carbon molten iron is obtained by supplying iron-containing cold material, carbonaceous material, and oxygen to a melting-only converter containing seed water, and this high-carbon molten iron is used as a raw material for oxygen blowing in another smelting-only converter. In the converter steelmaking method for obtaining molten steel with the required components, in the melting-only converter, high carbon molten iron is obtained in the total amount of the required refining amount in the refining-only converter and the required seed metal amount in the melting-only converter, The required refining amount of high carbon molten iron from the melting converter to the refining converter is provided for oxygen refining in one tap, while the remaining amount of seed metal of the high carbon molten iron is left in the melting converter. A converter steel manufacturing method characterized in that the converter is used as a seed hot water for melting the iron-containing cold material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62073997A JPS63241107A (en) | 1987-03-30 | 1987-03-30 | Converter steel making method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62073997A JPS63241107A (en) | 1987-03-30 | 1987-03-30 | Converter steel making method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63241107A true JPS63241107A (en) | 1988-10-06 |
| JPH0411603B2 JPH0411603B2 (en) | 1992-03-02 |
Family
ID=13534278
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62073997A Granted JPS63241107A (en) | 1987-03-30 | 1987-03-30 | Converter steel making method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63241107A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012092435A (en) * | 2010-09-29 | 2012-05-17 | Jfe Steel Corp | Steelmaking method using iron scrap |
| CN104109728A (en) * | 2014-07-31 | 2014-10-22 | 武钢集团昆明钢铁股份有限公司 | System and method for monitoring iron melting finishing of converter |
-
1987
- 1987-03-30 JP JP62073997A patent/JPS63241107A/en active Granted
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012092435A (en) * | 2010-09-29 | 2012-05-17 | Jfe Steel Corp | Steelmaking method using iron scrap |
| CN104109728A (en) * | 2014-07-31 | 2014-10-22 | 武钢集团昆明钢铁股份有限公司 | System and method for monitoring iron melting finishing of converter |
| CN104109728B (en) * | 2014-07-31 | 2015-11-18 | 武钢集团昆明钢铁股份有限公司 | A kind ofly be applied to monitoring converter and convert the system and method that iron completes |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0411603B2 (en) | 1992-03-02 |
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