JPH036202B2 - - Google Patents
Info
- Publication number
- JPH036202B2 JPH036202B2 JP57214637A JP21463782A JPH036202B2 JP H036202 B2 JPH036202 B2 JP H036202B2 JP 57214637 A JP57214637 A JP 57214637A JP 21463782 A JP21463782 A JP 21463782A JP H036202 B2 JPH036202 B2 JP H036202B2
- Authority
- JP
- Japan
- Prior art keywords
- semi
- reduction furnace
- reduced iron
- smelting reduction
- furnace
- 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 - Lifetime
Links
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 75
- 238000003723 Smelting Methods 0.000 claims description 58
- 229910000831 Steel Inorganic materials 0.000 claims description 30
- 239000010959 steel Substances 0.000 claims description 30
- 229910052742 iron Inorganic materials 0.000 claims description 17
- 238000004519 manufacturing process Methods 0.000 claims description 11
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 7
- 229910052799 carbon Inorganic materials 0.000 claims description 7
- 238000011946 reduction process Methods 0.000 claims description 4
- 238000010079 rubber tapping Methods 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims 1
- 238000006722 reduction reaction Methods 0.000 description 107
- 239000007789 gas Substances 0.000 description 38
- 239000003245 coal Substances 0.000 description 19
- 238000000034 method Methods 0.000 description 16
- 229910000805 Pig iron Inorganic materials 0.000 description 13
- 230000008018 melting Effects 0.000 description 13
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 12
- 238000002844 melting Methods 0.000 description 12
- 229910052760 oxygen Inorganic materials 0.000 description 12
- 239000001301 oxygen Substances 0.000 description 12
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 6
- 238000007664 blowing Methods 0.000 description 6
- 238000005261 decarburization Methods 0.000 description 5
- 239000002893 slag Substances 0.000 description 5
- 238000002485 combustion reaction Methods 0.000 description 4
- 238000009795 derivation Methods 0.000 description 4
- 239000000112 cooling gas Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- 238000007599 discharging Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 238000001465 metallisation Methods 0.000 description 2
- 239000012256 powdered iron Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 241000766026 Coregonus nasus Species 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000000567 combustion gas Substances 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000010309 melting process Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000002436 steel type 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
- C21B13/14—Multi-stage processes processes carried out in different vessels or furnaces
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
【発明の詳細な説明】
本発明は溶融還元を利用した溶鋼製造法に係
り、特に予備還元炉にて鉄鉱石を還元して得られ
た半還元鉄を、複数の溶融還元炉へ順次装入し、
各溶融還元炉ごとにバツチ方式で半還元鉄に溶融
還元および脱炭処理を行つて直接に溶鋼を製造し
得るようになした溶融還元を利用した溶鋼製造法
に関する。[Detailed Description of the Invention] The present invention relates to a method for manufacturing molten steel using smelting reduction, and in particular, semi-reduced iron obtained by reducing iron ore in a preliminary reduction furnace is sequentially charged into a plurality of smelting reduction furnaces. death,
The present invention relates to a molten steel production method using smelting reduction, in which molten steel is directly produced by subjecting semi-reduced iron to smelting reduction and decarburization in batches in each smelting reduction furnace.
溶融還元反応とは、溶融状態にて酸化鉄（鉄鉱
石）が鉄に還元される反応をいう。また溶融還元
法とは、安価で非常に広範囲に存在する一般炭と
酸化鉄鉱石とを直接利用して鉄鉱石から鉄をつく
る方法であり、高炉法における焼結ペレツト、コ
ークスのような原料への前処理を必要としない。
溶融還元法は、現在、製鉄法として主流を占めて
いる高炉を主体とした大規模一貫製鉄法に対し、
原料・燃料の融通性や生産性の良さや設備コスト
の低減が図れる等の理由から研究開発が活発に行
われつつあり、将来高炉法にとつて代る可能性を
有するものとして注目されてる。 The melt reduction reaction refers to a reaction in which iron oxide (iron ore) is reduced to iron in a molten state. In addition, the smelting reduction method is a method of producing iron from iron ore by directly using thermal coal and iron oxide ore, which are inexpensive and widely available. No pretreatment is required.
The smelting reduction method is different from the large-scale integrated steel manufacturing method using blast furnaces, which is currently the mainstream iron manufacturing method.
Research and development is being actively conducted on this method due to its flexibility in raw materials and fuel, good productivity, and ability to reduce equipment costs, and it is attracting attention as a method that has the potential to replace the blast furnace method in the future.
第１図乃至第２図は、現在、研究開発されてい
る溶融還元法のプロセスフローを示すものであ
る。図示する如く、特に予備処理をしない状態の
粉状又は粒状の鉄鉱石と石炭とは、そのまま予備
還元炉Ａに投入される（第２図の場合には、直接
に溶融還元炉Ｂ上部の高温還元雰囲気下の予備還
元部Ｃに投入される。）。鉄鉱石は予備還元炉Ａ
（あるいは予備還元部Ｃ）にて溶融還元炉Ｂから
のCO、H2等の溶融還元炉発生ガスＤにより予備
還元されて半還元鉄となり、半還元鉄Ｅはチヤー
とともに溶融還元炉Ｂに送られる。そして、酸素
と炭素との燃焼により生じた高温還元雰囲気の溶
融還元炉Ｂで半還元鉄Ｅは溶解され最終還元を受
けて銑鉄となる。溶融還元炉Ｂで得られた銑鉄
は、後続の転炉Ｆにて供給酸素により脱炭処理さ
れて溶鋼となり、更に連続鋳造機等で鋼片とされ
る。 FIGS. 1 and 2 show the process flow of the smelting reduction method currently being researched and developed. As shown in the figure, powdered or granular iron ore and coal that have not been particularly pretreated are directly charged into the pre-reduction furnace A (in the case of Fig. 2, they are directly placed in the high temperature upper part of the smelting reduction furnace (The product is put into the preliminary reduction section C under a reducing atmosphere.) Iron ore is in preliminary reduction furnace A
(or in the preliminary reduction section C), the semi-reduced iron is pre-reduced by the smelting-reduction furnace generated gas D such as CO and H 2 from the smelting-reduction furnace B, and the semi-reduced iron E is sent to the smelting-reduction furnace B along with the char. It will be done. Then, the semi-reduced iron E is melted in a melting reduction furnace B in a high-temperature reducing atmosphere generated by combustion of oxygen and carbon, and undergoes final reduction to become pig iron. The pig iron obtained in the smelting reduction furnace B is decarburized by supplied oxygen in the subsequent converter F to become molten steel, and is further made into steel slabs in a continuous casting machine or the like.
ところで、転炉Ｆは、その操業技術が非常に難
かきく、また転炉設備は大量生産（50万トン／年
以上）しないと採算が合わず、更に溶融還元炉Ｂ
から転炉Ｆへの銑鉄移送時の熱ロスが大きい。そ
こで溶融還元炉Ｂで直接鋼が得られれば、転炉Ｆ
を省略でき、設備コスト、省エネルギ、操業性な
どの点で有利となる。しかしながら、予備還元炉
Ａからは次々に半還元鉄Ｅが切り出されて溶融還
元炉Ｂに送られるので、一貫したプロセスの流れ
を阻害しないように溶融還元炉Ｂでは半還元鉄の
溶融還元が終了した後は、脱炭処理することなく
銑鉄の状態で排出しなくてはならない。また、予
備還元炉Ａから半還元鉄が次々に切り出されてく
るため、溶融還元炉Ｂ内は還元雰囲気を維持する
必要から炭素リツチな状態にあるので還元された
鉄中に炭素が溶け込み易く、溶融還元炉Ｂの操業
条件を適当に変えても現状では鋼を生産すること
はできない。 By the way, the operating technology for converter F is extremely difficult, and the converter equipment is not profitable unless it is mass produced (more than 500,000 tons/year).
The heat loss during transfer of pig iron from the converter to the converter F is large. Therefore, if steel can be obtained directly in smelting reduction furnace B, converter F
can be omitted, which is advantageous in terms of equipment costs, energy savings, operability, etc. However, since the semi-reduced iron E is cut out one after another from the preliminary reduction furnace A and sent to the smelting reduction furnace B, the smelting reduction of the semi-reduced iron is finished in the smelting reduction furnace B so as not to disturb the consistent flow of the process. After that, it must be discharged in the form of pig iron without decarburization. In addition, since the semi-reduced iron is cut out one after another from the preliminary reduction furnace A, the inside of the smelting reduction furnace B is in a carbon-rich state due to the need to maintain a reducing atmosphere, so carbon easily dissolves into the reduced iron. Even if the operating conditions of smelting reduction furnace B are changed appropriately, steel cannot be produced at present.
本発明は以上の従来の問題点を有効に解決すべ
く創案されたものであり、本発明の目的は溶融還
元炉から直接に溶鋼を生産することができると共
に転炉を不要とし得、運転コスト、設備コストを
低減でき且つ操業性を向上し得る溶融還元を利用
した溶鋼製造法を提供することにある。 The present invention was devised to effectively solve the above-mentioned conventional problems, and the purpose of the present invention is to be able to produce molten steel directly from a smelting reduction furnace, eliminate the need for a converter, and reduce operating costs. Another object of the present invention is to provide a method for producing molten steel using smelting reduction, which can reduce equipment costs and improve operability.
以下に本発明方法を添付図面に従つて詳述す
る。 The method of the present invention will be explained in detail below with reference to the accompanying drawings.
第３図は本発明を実施するための装置の概略系
統図であり、本装置は予備還元炉３と第１及び第
２の溶融還元炉１，２とから主に構成されてい
る。 FIG. 3 is a schematic system diagram of an apparatus for carrying out the present invention, and this apparatus is mainly composed of a preliminary reduction furnace 3 and first and second melting reduction furnaces 1 and 2.
予備還元炉３は流動層形式のものであり、予備
還元炉３上方には、その頂部に粉状の鉄鉱石と石
炭を装入するための鉄鉱石供給ホツパ４と石炭供
給ホツパ５とがそれぞれ設けられ、また予備還元
炉３下部には、炉内に還元ガスを吹き込むための
還元ガス供給ライン２１が接続されている。ま
た、予備還元炉３上部には、還元処理後のガスを
排出するための排ガスライン７が接続されてお
り、排ガスライン７には排ガスを冷却する冷却器
８が設けられている（排ガス中には、可燃分がま
だかなり含まれているため、排ガスは発電やペト
ロケミカル用として使われる。）。 The preliminary reduction furnace 3 is of a fluidized bed type, and above the preliminary reduction furnace 3, an iron ore supply hopper 4 and a coal supply hopper 5 for charging powdered iron ore and coal are provided at the top of the furnace, respectively. Further, a reducing gas supply line 21 for blowing reducing gas into the furnace is connected to the lower part of the preliminary reduction furnace 3. Further, an exhaust gas line 7 for discharging the gas after reduction treatment is connected to the upper part of the preliminary reduction furnace 3, and a cooler 8 for cooling the exhaust gas is provided in the exhaust gas line 7 (in the exhaust gas (The exhaust gas is used for power generation and petrochemical purposes, as it still contains considerable combustible content.)
予備還元炉３にて鉄鉱石は予備還元され半還元
鉄が生成されるが、この半還元鉄をチヤーととも
に第１および第２の溶融還元炉１，２に導入する
ために、予備還元炉３底部と第１および第２溶融
還元炉１，２頂部との間には半還元鉄導入ライン
９，１０がそれぞれ介設されている。半還元鉄導
入ライン９，１０には、予備還元炉３で得られた
半還元鉄およびチヤーを第１と第２の溶融還元炉
１，２に交互に装入できる切換手段が設けられて
いる。第１および第２の溶融還元炉１，２には、
酸素吹込ランス１１と、石炭供給シユート１２
と、スチーム供給管１３とがそれぞれ設けられて
いる。酸素吹込ランス１１は炉内上方より酸素を
吹き込むためのもので、昇降自在に構成されてい
る。更に、溶融還元炉１，２底部には、スラグ排
出口１４と溶鋼排出口１５とがそれぞれ形成され
ている。 The iron ore is pre-reduced in the pre-reduction furnace 3 to produce semi-reduced iron. Semi-reduced iron introduction lines 9 and 10 are interposed between the bottom and the tops of the first and second smelting reduction furnaces 1 and 2, respectively. The semi-reduced iron introduction lines 9 and 10 are provided with switching means that can alternately charge the semi-reduced iron and char obtained in the preliminary reduction furnace 3 into the first and second smelting reduction furnaces 1 and 2. . The first and second melting reduction furnaces 1 and 2 include
Oxygen injection lance 11 and coal supply chute 12
and a steam supply pipe 13 are provided, respectively. The oxygen blowing lance 11 is for blowing oxygen into the furnace from above, and is configured to be able to move up and down. Furthermore, a slag discharge port 14 and a molten steel discharge port 15 are formed at the bottoms of the smelting reduction furnaces 1 and 2, respectively.
溶融還元炉１，２では酸素とチヤーおよび石炭
との燃焼により高温の還元ガスが生成され半還元
鉄は溶融還元されるが、溶融還元炉１，２で発生
したCO、H2等の還元ガス炉外に取り出すため
に、溶融還元炉１，２上部には、発生ガス導出ラ
イン１６，１７がそれぞれ取り付けられている。
発生ガス導出ライン１６，１７は発生ガス供給ラ
イン６に接続され、また発生ガス導出ライン１
６，１７にはラインを開閉するための開閉弁等が
設けられている。発生ガス供給ライン６には、発
生ガス中のダスト取り除くための除塵器１８が設
けられている。また発生ガス供給ライン６は還元
ガス供給ライン２１の冷却ガスライン１９に別れ
る。冷却ガスライン１９は還元ガスの一部をバイ
パスさせて冷却し予備還元炉３に供給される還元
ガスの温度をコントロールするための温度コント
ロール用ラインである。冷却ガスライン１９には
冷却器２０が設けられている。 In the smelting reduction furnaces 1 and 2, high-temperature reducing gas is generated by combustion of oxygen, chir, and coal, and the semi-reduced iron is smelted and reduced. Generated gas derivation lines 16 and 17 are attached to the upper portions of the melting and reduction furnaces 1 and 2, respectively, in order to take the gas out of the furnace.
The generated gas derivation lines 16 and 17 are connected to the generated gas supply line 6, and the generated gas derivation line 1
6 and 17 are provided with on-off valves and the like for opening and closing the lines. The generated gas supply line 6 is provided with a dust remover 18 for removing dust from the generated gas. Further, the generated gas supply line 6 is separated into a cooling gas line 19 of a reducing gas supply line 21. The cooling gas line 19 is a temperature control line that bypasses and cools a part of the reducing gas and controls the temperature of the reducing gas supplied to the preliminary reduction furnace 3. A cooler 20 is provided in the cooling gas line 19.
鉄鉱石は予備還元炉３で予熱および固体状態で
の予備還元を受けて半還元鉄となり、半還元鉄は
溶融還元炉１，２で溶融還元されて銑鉄となり、
更に、脱炭処理により溶鋼が製造されるが、次に
この製造工程を説明する。 Iron ore is preheated and pre-reduced in a solid state in a pre-reduction furnace 3 to become semi-reduced iron, and the semi-reduced iron is melted and reduced in smelting reduction furnaces 1 and 2 to become pig iron.
Furthermore, molten steel is manufactured by decarburization treatment, and this manufacturing process will be explained next.
まず、予備還元炉３においては、鉄鉱石供給ホ
ツパ４と石炭供給ホツパ５とから予備還元炉３頂
部に粉状の鉄鉱石と石炭とがそれぞれ装入され、
一方、還元ガス供給ライン２１より予備還元炉３
下部から高温の還元ガスが吹きこまれて予備還元
炉３には流動層が形成される。鉄鉱石は流動状態
にて高温の還元ガスにより加熱されると共に予備
還元されて、その金属化率が50〜90％の高温の半
還元鉄が生成される。予備還元炉３は流動層式な
ので、鉄鉱石の焼結防止のために、石炭供給ホツ
パ５から石炭を供給している。また、石炭は鉄鉱
石の還元促進材ともなつている。しかし、予備還
元炉としてシヤフト炉を用いる場合には石炭は必
要ない。この予備還元炉３では、予備還元されて
得られる半還元鉄の金属化率の制御は、還元ガス
の成分と温度、更には投入石炭量によつてコント
ロールされる。 First, in the preliminary reduction furnace 3, powdered iron ore and coal are charged to the top of the preliminary reduction furnace 3 from the iron ore supply hopper 4 and the coal supply hopper 5, respectively.
On the other hand, the preliminary reduction furnace 3 is connected to the reducing gas supply line 21.
A fluidized bed is formed in the preliminary reduction furnace 3 by blowing high-temperature reducing gas from the lower part. Iron ore is heated in a fluidized state with a high-temperature reducing gas and is pre-reduced to produce high-temperature semi-reduced iron with a metallization rate of 50 to 90%. Since the preliminary reduction furnace 3 is of a fluidized bed type, coal is supplied from a coal supply hopper 5 to prevent sintering of the iron ore. Coal also serves as a reduction accelerator for iron ore. However, if a shaft furnace is used as the preliminary reduction furnace, coal is not required. In this preliminary reduction furnace 3, the metallization rate of semi-reduced iron obtained by preliminary reduction is controlled by the components and temperature of the reducing gas, and further by the amount of coal input.
次いで、予備還元炉３で得られた半還元鉄をチ
ヤーとともに第１および第２の溶融還元炉１，２
のいずれか一方に装入する。第３図は、第１の溶
融還元炉１には半還元鉄が既に装入されており、
半還元鉄導入ライン１０を通つて予備還元炉３か
ら第２の溶融還元炉２に半還元鉄が装入されてい
る状況を示す（第３図中、半還元鉄導入ライン
９，１０と発生ガス導出ライン１６，１７の実線
と破線との区別は、バツチ操業におけるON、
OFFの状態をそれぞれ示すものである。）。 Next, the semi-reduced iron obtained in the preliminary reduction furnace 3 is transferred to the first and second smelting reduction furnaces 1 and 2 together with the char.
Charge either one of the two. FIG. 3 shows that semi-reduced iron has already been charged into the first smelting reduction furnace 1.
This shows a situation in which semi-reduced iron is charged from the preliminary reduction furnace 3 to the second smelting reduction furnace 2 through the semi-reduced iron introduction line 10 (in Fig. 3, the semi-reduced iron introduction lines 9, 10 and The distinction between the solid line and the broken line of the gas derivation lines 16 and 17 is the ON,
Each indicates the OFF state. ).
第１の溶融還元炉１に装入された高温の半還元
鉄は、酸素吹込ランス１１からの酸素と石炭供給
シユート１２から投入された石炭および半還元鉄
とともに装入されたチヤーとの燃焼により溶解さ
れ、半還元鉄は溶融状態にて高温の還元性の強い
燃焼ガスにもり溶融還元される。酸化鉄の溶融状
態での還元反応速度は固体状態での還元反応速度
に比較して著しく速く（約10倍〜約100倍といわ
れている）、半還元鉄は急速に還元され銑鉄が生
成される。スチーム供給管１３からのスチーム供
給は、燃焼による炉内温度上昇を抑えこれを調整
するためである。銑鉄生成後、一時、酸素と石炭
の供給を停止し、溶融還元工程で生成されたスラ
グをスラグ排出口１４から炉外に排出する。そし
てスラグ排出後、速やかに酸素吹込ランス１１よ
り酸素を噴射して銑鉄の脱炭を行う。銑鉄中の炭
素が除去され、規定の炭素含有量にまで下がつた
時点で鋼としての溶鋼排出口１５から出鋼する。 The high-temperature semi-reduced iron charged into the first smelting reduction furnace 1 is caused by combustion of oxygen from the oxygen injection lance 11 and the coal charged from the coal supply chute 12 and the coal charged together with the semi-reduced iron. The semi-reduced iron is melted and reduced in a molten state by high-temperature highly reducing combustion gas. The reduction reaction rate of iron oxide in the molten state is significantly faster (approximately 10 to 100 times faster) than the reduction reaction rate in the solid state, and semi-reduced iron is rapidly reduced to produce pig iron. Ru. The purpose of supplying steam from the steam supply pipe 13 is to suppress and adjust the temperature rise in the furnace due to combustion. After producing pig iron, the supply of oxygen and coal is temporarily stopped, and the slag produced in the melting and reduction process is discharged from the furnace through the slag discharge port 14. After the slag is discharged, oxygen is immediately injected from the oxygen injection lance 11 to decarburize the pig iron. When the carbon in the pig iron is removed and the carbon content has decreased to a specified level, the molten steel is tapped from the outlet 15 as steel.
一方、第２の溶融還元炉２では、第１の溶融還
元炉１の上記溶融還元およびスラグ排出工程中、
予備還元炉３からの半還元鉄の装入を行つてい
る。そして、第１の溶融還元炉１で脱炭処理のた
め吹錬を行う時点で第２の溶融還元炉２の溶融還
元を開始する。これは、還元ガス供給ライン２１
から予備還元炉３に供給される還元ガスの成分、
温度、量等の変動を極力少なくするためである。
従つて、また、第２の溶融還元炉２が脱炭工程に
入つた時点で第１の溶融還元炉１の溶融還元処理
を始める。 On the other hand, in the second melting reduction furnace 2, during the melting reduction and slag discharge process of the first melting reduction furnace 1,
Semi-reduced iron from the preliminary reduction furnace 3 is being charged. Then, at the time when blowing is performed for decarburization in the first smelting reduction furnace 1, smelting reduction in the second smelting reduction furnace 2 is started. This is the reducing gas supply line 21
Components of the reducing gas supplied to the preliminary reduction furnace 3 from
This is to minimize fluctuations in temperature, amount, etc.
Therefore, when the second melting reduction furnace 2 enters the decarburization process, the melting reduction process in the first melting reduction furnace 1 is started.
このように、予備還元炉３から次々に切り出さ
れる半還元鉄を交互に溶融還元炉１，２に装入す
るようにしたため、従来の一基のみの溶融還元炉
のように炉内を常時、還元性の強い炭素リツチな
状態に維持する必要がなくなり、各溶融還元炉
１，２ごとに、溶融還元後の銑鉄に更に脱炭処理
を施すことができ溶融還元炉１，２から直接鋼を
製造することができる。また、直接に溶鋼が製造
できるため、転炉設備が不要となる。転炉設備は
現在約50万トン／年以上の生産を行わないと採算
が合わず、大規模製鉄所にしか適さないが、転炉
を省略できる本発明は、小規模な製鉄生産にも適
用できる。更に従来のような溶融還元炉から転炉
への銑鉄移送の問題でなくなるので、それら設備
や移送時の熱損失がなくなる。また、操業技術が
非常に難かしい転炉が不要となるので、その分操
業が容易となる。 In this way, the semi-reduced iron cut out one after another from the pre-reduction furnace 3 is alternately charged into the smelting reduction furnaces 1 and 2, so that the interior of the furnace is constantly operated, unlike a conventional smelting reduction furnace with only one unit. It is no longer necessary to maintain a highly reducing carbon-rich state, and the pig iron after smelting and reduction can be further decarburized in each smelting reduction furnace 1 and 2. can be manufactured. Additionally, since molten steel can be produced directly, converter equipment is not required. Currently, converter equipment is unprofitable unless the production capacity is approximately 500,000 tons/year or more, and is suitable only for large-scale steel plants. However, the present invention, which can omit the converter, can also be applied to small-scale steel production. can. Furthermore, since there is no longer a problem of transferring pig iron from a smelting reduction furnace to a converter as in the past, there is no heat loss during the equipment or transfer. In addition, since a converter, which is extremely difficult to operate, is not required, operation becomes easier.
更に、溶融還元炉に順次、適宜インターバルに
て半還元鉄を装入するようにしたため、溶融還元
炉間にガス発生に時間差が生ずるが、溶融還元炉
への半還元鉄装入から溶鋼の出鋼までの１サイク
ルの周期を一定にコントロールすることにより予
備還元炉への還元ガスの成分、温度、供給量等が
一定した安定な還元ガスを供給することができ
る。この点従来方式では、溶融還元初期と末期で
は発生ガスの成分等が異なるため、予備還元炉で
の鉄鉱石の還元にバラツキが生じてしまう。 Furthermore, since semi-reduced iron is charged sequentially into the smelting reduction furnace at appropriate intervals, there is a time difference in gas generation between the smelting reduction furnaces, but there is a difference in time between charging semi-reduced iron into the smelting reduction furnace and discharging molten steel. By controlling the period of one cycle until steel is constant, it is possible to supply stable reducing gas to the preliminary reduction furnace with constant components, temperature, supply amount, etc. of the reducing gas. In this regard, in the conventional method, since the components of the generated gas differ between the initial stage and the final stage of smelting reduction, variations occur in the reduction of iron ore in the preliminary reduction furnace.
また、溶融還元炉ごとに半還元鉄以外にクロム
鋼等の合金材料などを加えれば、各溶融還元炉で
種々の異なつた鋼種の生産が可能となる。なお、
上記実施例は、溶融還元炉が二期の場合であつた
が、三基以上設けても勿論よい。また、鉱石、石
炭にも特に制限はなく、従来操業可能なものであ
ればいずれのものを使用してもよい。 Furthermore, if an alloy material such as chromium steel is added to each smelting reduction furnace in addition to semi-reduced iron, each smelting reduction furnace can produce various types of steel. In addition,
In the above embodiment, there are two melting reduction furnaces, but it is of course possible to provide three or more melting reduction furnaces. Moreover, there is no particular restriction on ore or coal, and any one that can be conventionally operated may be used.
以上の説明より明らかな如く、本発明によれば
次のような優れた効果を発揮することができる。 As is clear from the above description, the present invention can exhibit the following excellent effects.
(1) 溶融還元炉はバツチ式であるが、予備還元炉
は連続操業であり、各溶融還元炉からは銑鉄で
はなく順次直接に溶鋼が得られ、全体としてほ
ぼ連続した溶鋼の生産を実現できる。(1) The smelting reduction furnace is a batch type, but the pre-reduction furnace is a continuous operation, and molten steel is obtained directly from each smelting reduction furnace instead of pig iron, making it possible to achieve almost continuous production of molten steel as a whole. .
(2) 直接溶鋼を得ることができ、転炉設備を不要
とできる。従つて、設備コストの低減、小規模
製造が可能になると共に、銑鉄移送による熱ロ
スがなく、また操業の容易化が図れる。(2) Molten steel can be obtained directly, eliminating the need for converter equipment. Therefore, equipment costs can be reduced, small-scale production is possible, there is no heat loss due to transfer of pig iron, and operation can be facilitated.
(3) 溶融還元工程にある溶融還元炉の排ガスを還
元ガスとして予備還元炉に供給すべく、複数の
溶融還元炉と１つの予備還元炉との間の還元ガ
スの供給ラインを溶融還元炉における半還元鉄
装入から溶鋼出鋼までのサイクルに応じて順次
切り換えているため、予備還元炉還元ガスの成
分・温度・供給量等を一定にコントロールする
ことが可能となり、予備還元炉での鉄鋼石の還
元率はバラツキが少なく均一なものとなる。(3) In order to supply the exhaust gas from the smelting reduction furnace in the smelting reduction process to the preliminary reduction furnace as reducing gas, the reducing gas supply line between the multiple smelting reduction furnaces and one preliminary reduction furnace is connected to the smelting reduction furnace. Since the switching is performed sequentially according to the cycle from semi-reduced iron charging to molten steel tapping, it is possible to control the components, temperature, supply amount, etc. of the reducing gas in the pre-reducing furnace at a constant level. The reduction rate of stones becomes uniform with little variation.
(4) 各溶融還元炉を別々に操業できるため、各溶
融還元炉ごとに種々の異なつた鋼種の生産がで
き、小ロツト高級品化に対応できる。(4) Since each smelting reduction furnace can be operated separately, each smelting reduction furnace can produce a variety of different steel types, making it possible to respond to small lots of high-grade products.
第１図、第２図は従来の溶融還元法による溶鋼
製造を示す工程図、第３図は本発明方法を実施す
るための装置の系統図である。
図中１，２は溶融還元炉、３は予備還元炉、２
１は還元ガス供給ライン、９，１０は半還元鉄導
入ライン、１１は酸素吹込ランス、１２は石炭供
給シユート、１５は溶鋼排出口、１６，１７は発
生ガス導出ラインである。
1 and 2 are process diagrams showing the production of molten steel by the conventional smelting reduction method, and FIG. 3 is a system diagram of an apparatus for carrying out the method of the present invention. In the figure, 1 and 2 are smelting reduction furnaces, 3 is a preliminary reduction furnace, and 2
1 is a reducing gas supply line, 9 and 10 are semi-reduced iron introduction lines, 11 is an oxygen blowing lance, 12 is a coal supply chute, 15 is a molten steel outlet, and 16 and 17 are generated gas outlet lines.
Claims (1)
続して生成し、該半還元鉄を複数の溶融還元炉に
半還元鉄装入から溶鋼出鋼までのサイクルに応じ
て順次切り換えて装入し、半還元鉄が装入された
溶融還元炉内で炭素を含む高温還元雰囲気下にて
上記半還元鉄を溶融還元した後、同一炉内で引続
き脱炭して溶鋼を製造すると共に、溶融還元工程
にある溶融還元炉の排ガスを予備還元炉還元ガス
として成分・温度・供給量等を調整して供給すべ
く、複数の溶融還元炉と予備還元炉との間の還元
ガスの供給ラインを溶融還元炉における半還元鉄
装入から溶鋼出鋼までのサイクルに応じて順次切
り換えるようにしたことを特徴とする溶融還元を
利用した溶鋼製造法。1. Semi-reduced iron is continuously produced by reducing iron ore in a preliminary reduction furnace, and the semi-reduced iron is sequentially switched to a plurality of smelting reduction furnaces according to the cycle from charging semi-reduced iron to tapping molten steel. After the semi-reduced iron is melted and reduced in a high-temperature reducing atmosphere containing carbon in a smelting reduction furnace into which semi-reduced iron is charged, the semi-reduced iron is subsequently decarburized in the same furnace to produce molten steel. In order to supply the exhaust gas from the smelting reduction furnace in the smelting reduction process as the pre-reduction furnace reducing gas by adjusting the composition, temperature, supply amount, etc., reducing gas is supplied between multiple smelting reduction furnaces and the pre-reduction furnace. A method for producing molten steel using smelting reduction, characterized in that the line is sequentially switched according to the cycle from charging semi-reduced iron to tapping molten steel in a smelting reduction furnace.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21463782A JPS59107013A (en) | 1982-12-09 | 1982-12-09 | Production of molten steel utilizing melt reduction |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21463782A JPS59107013A (en) | 1982-12-09 | 1982-12-09 | Production of molten steel utilizing melt reduction |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59107013A JPS59107013A (en) | 1984-06-21 |
| JPH036202B2 true JPH036202B2 (en) | 1991-01-29 |
Family
ID=16659040
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21463782A Granted JPS59107013A (en) | 1982-12-09 | 1982-12-09 | Production of molten steel utilizing melt reduction |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59107013A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52150318A (en) * | 1976-06-10 | 1977-12-14 | Nippon Steel Corp | Production of molten iron by reduction of iron oxide |
| JPS53142313A (en) * | 1977-05-18 | 1978-12-12 | Kawasaki Steel Co | Method of making molten reduced iron |
| JPS5785911A (en) * | 1980-11-18 | 1982-05-28 | Ishikawajima Harima Heavy Ind Co Ltd | Direct reduction and melting method for iron oxide |
| JPS57120607A (en) * | 1980-09-12 | 1982-07-27 | Korf Stahl | Method and apparatus for directly obtaining molten metal from crude iron ore |
-
1982
- 1982-12-09 JP JP21463782A patent/JPS59107013A/en active Granted
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52150318A (en) * | 1976-06-10 | 1977-12-14 | Nippon Steel Corp | Production of molten iron by reduction of iron oxide |
| JPS53142313A (en) * | 1977-05-18 | 1978-12-12 | Kawasaki Steel Co | Method of making molten reduced iron |
| JPS57120607A (en) * | 1980-09-12 | 1982-07-27 | Korf Stahl | Method and apparatus for directly obtaining molten metal from crude iron ore |
| JPS5785911A (en) * | 1980-11-18 | 1982-05-28 | Ishikawajima Harima Heavy Ind Co Ltd | Direct reduction and melting method for iron oxide |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59107013A (en) | 1984-06-21 |
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