JPH01104706A - Smelting reduction method - Google Patents
Smelting reduction methodInfo
- Publication number
- JPH01104706A JPH01104706A JP62260603A JP26060387A JPH01104706A JP H01104706 A JPH01104706 A JP H01104706A JP 62260603 A JP62260603 A JP 62260603A JP 26060387 A JP26060387 A JP 26060387A JP H01104706 A JPH01104706 A JP H01104706A
- Authority
- JP
- Japan
- Prior art keywords
- furnace
- smelting furnace
- secondary combustion
- smelting
- iron ore
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000003723 Smelting Methods 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 21
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 57
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 37
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 37
- 239000001301 oxygen Substances 0.000 claims abstract description 37
- 239000007789 gas Substances 0.000 claims abstract description 32
- 229910052742 iron Inorganic materials 0.000 claims abstract description 28
- 238000002485 combustion reaction Methods 0.000 claims abstract description 23
- 238000005261 decarburization Methods 0.000 claims abstract description 14
- 239000003575 carbonaceous material Substances 0.000 claims abstract description 13
- 238000007664 blowing Methods 0.000 claims abstract description 12
- 238000003756 stirring Methods 0.000 claims abstract description 9
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 8
- 238000002844 melting Methods 0.000 claims description 7
- 230000008018 melting Effects 0.000 claims description 7
- 239000000155 melt Substances 0.000 claims description 4
- 239000002893 slag Substances 0.000 abstract description 8
- 239000002184 metal Substances 0.000 description 8
- 229910052751 metal Inorganic materials 0.000 description 8
- 230000003647 oxidation Effects 0.000 description 8
- 238000007254 oxidation reaction Methods 0.000 description 8
- 239000002994 raw material Substances 0.000 description 7
- 238000010586 diagram Methods 0.000 description 5
- 230000007423 decrease Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 235000011941 Tilia x europaea Nutrition 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000003610 charcoal Substances 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 229910001882 dioxygen Inorganic materials 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 239000004571 lime Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910000805 Pig iron Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 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
- 239000000446 fuel Substances 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000006213 oxygenation reaction Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000011946 reduction process Methods 0.000 description 1
- 239000011819 refractory material 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
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/02—Making spongy iron or liquid steel, by direct processes in shaft furnaces
- C21B13/029—Introducing coolant gas in the shaft furnaces
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2100/00—Handling of exhaust gases produced during the manufacture of iron or steel
- C21B2100/20—Increasing the gas reduction potential of recycled exhaust gases
- C21B2100/26—Increasing the gas reduction potential of recycled exhaust gases by adding additional fuel in recirculation pipes
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2100/00—Handling of exhaust gases produced during the manufacture of iron or steel
- C21B2100/40—Gas purification of exhaust gases to be recirculated or used in other metallurgical processes
- C21B2100/44—Removing particles, e.g. by scrubbing, dedusting
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2100/00—Handling of exhaust gases produced during the manufacture of iron or steel
- C21B2100/60—Process control or energy utilisation in the manufacture of iron or steel
- C21B2100/66—Heat exchange
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は、転炉型の溶融還元法における製鉄において、
溶湯への熱附加を効率よく行うための溶融還元法に関す
るものである。[Detailed Description of the Invention] [Industrial Application Field] The present invention is directed to steel manufacturing using a converter type smelting reduction method.
This invention relates to a melt reduction method for efficiently adding heat to molten metal.
［従来の技術］
溶融還元法は、高炉製銑法に変わるものであり、高炉製
銑法においては高炉の建設費が高く、広大な敷地が必要
であるという高炉製銑法の欠点を解消すべく、近年に至
り開発されたものである。[Conventional technology] The smelting reduction method is an alternative to the blast furnace iron making method, and it eliminates the drawbacks of the blast furnace iron making method, such as the high construction cost and the need for a large site. It has been developed in recent years.
この還元法においては、製錬炉内の溶銑中に原料となる
予備還−元鉱石又は生鉱石が装入され、また還元材また
は燃料となる炭材及び石灰その他の造滓剤が装入された
製錬炉内に酸素が吹き込まれる。そうすると炭材が溶銑
中に溶解するとともに、炭材の炭素が酸素ガスによって
酸化される。このときの酸化熱によって鉱石が溶融され
るとともに、鉱石が炭材中の炭素によって還元される。In this reduction method, pre-reduced ore or raw ore is charged into hot metal in a smelting furnace, and carbonaceous materials, lime, and other slag-forming agents are charged as reducing agents or fuel. Oxygen is blown into the smelting furnace. Then, the carbonaceous material is dissolved in the hot metal, and the carbon of the carbonaceous material is oxidized by the oxygen gas. The ore is melted by the heat of oxidation at this time, and the ore is reduced by the carbon in the carbonaceous material.
溶銑から発生するＣＯガスは過剰に吹き込まれる酸素ガ
スにより２次燃焼されてＣＯ２ガスになる。このＣＯ２
ガスの顕熱は、溶銑上を覆っているスラグに伝達され、
次いで溶銑に伝達される。The CO gas generated from the hot metal is subjected to secondary combustion by the excessively blown oxygen gas and becomes CO2 gas. This CO2
The sensible heat of the gas is transferred to the slag covering the hot metal,
It is then transferred to the hot metal.
こうして鉄鉱石が還元されて溶銑が製造されるが、製錬
炉における鉄鉱石の還元工程を軽減するため、前記製錬
炉に装入される前の鉄鉱石の予備還元率を６０乃至７５
％とし、従って、製錬炉の排ガスは還元性の高い低酸化
度のガスを多量に使用している。In this way, iron ore is reduced to produce hot metal, but in order to reduce the iron ore reduction process in the smelting furnace, the preliminary reduction rate of the iron ore before being charged into the smelting furnace is set to 60 to 75.
%, therefore, the exhaust gas from the smelting furnace uses a large amount of highly reducing gas with a low oxidation degree.
［発明が解決しようとする問題点］
しかしながら、前記製錬炉から排出されるガスを利用し
て、予備還元率を３０％以上にする場合には、製錬炉の
排出ガスの酸化度を下げ、また前記ガス量を多量に必要
とするので、ＣＯ２ガスの燃焼度つまり２次燃焼効率が
下がって溶融還元の熱効率が低下する虞がある。[Problems to be Solved by the Invention] However, when using the gas discharged from the smelting furnace to increase the preliminary reduction rate to 30% or more, it is necessary to reduce the degree of oxidation of the exhaust gas from the smelting furnace. Furthermore, since a large amount of the gas is required, there is a risk that the burnup of CO2 gas, that is, the secondary combustion efficiency will decrease, and the thermal efficiency of smelting reduction will decrease.
この発明は、かかる問題点を解決するためになされたも
のであって、前記製錬炉からの排出エネルギ７を抑え、
溶融還元の熱効率を向上させる溶融還元法を提供しよう
とするものである。This invention was made in order to solve such problems, and it suppresses the exhaust energy 7 from the smelting furnace,
The present invention aims to provide a smelting reduction method that improves the thermal efficiency of smelting reduction.
［問題点を解決するための手段］
この発明による溶融還元法は鉄鉱石を予熱予備還元炉で
予熱、予備還元して炭材、造滓剤ともに製錬炉に装入し
、脱炭用及び２次燃焼用ノズルを有する上吹き酸素ラン
スから酸素を吹き込むとともに、製錬炉の側壁または炉
底に設けられた羽口から攪拌用ガスを吹き込んで鉄鉱石
を溶融還元する方法であって、前記脱炭用ノズルの吐出
角度が１５度以下で、かつ前記２次燃焼用ノズルの吐出
角度が３０度以上４５度以下であることを特徴とする。[Means for Solving the Problems] In the smelting reduction method according to the present invention, iron ore is preheated and pre-reduced in a preheating pre-reduction furnace, and both carbon material and slag-forming agent are charged into a smelting furnace. A method for melting and reducing iron ore by blowing oxygen from a top-blown oxygen lance having a secondary combustion nozzle and blowing stirring gas from a tuyere provided on the side wall or bottom of a smelting furnace, the method comprising: The discharge angle of the decarburization nozzle is 15 degrees or less, and the discharge angle of the secondary combustion nozzle is 30 degrees or more and 45 degrees or less.
［作用］
製錬炉に種湯となる溶銑な予め装入し、ざらに造滓剤及
び炭材を装入して酸素吹錬を行いスラグが形成された後
鉄鉱石が装入され、炭材またはＣＯガスの燃焼により反
応熱または溶解熱が供給され、また前記炭材及び鉄浴中
の［Ｃ］による鉄鉱石の溶融還元が進行する。このとき
酸素ランスは脱炭用及び２次燃焼用の酸素ノズルを有し
、脱炭用ノズルからの酸素ジェットの吐出角は１５度以
内とされであるので、前記酸素ジェットは銅浴面に垂直
に近い角度で衝突して脱炭が効率良く行われる。また２
次燃焼用ノズルからの酸素シェドの吐出角度は垂直に近
い場合は２次燃焼により生成したＣＯ２ガスが前鉄浴か
ら飛散する粒鉄に含まれる［Ｃ］により還元されてＣＯ
ガスとなって排出されるので熱効率を低下させる。虞が
ある。反対に前記吐出角度が水平に近い場合は製錬炉の
内壁耐火物の損耗が激しく製造コストの増大につながる
虞がある。以上の問題から２次燃焼用ノズルの吐出角度
の範囲を検討した結果これを８０度以上４５度以下とす
ることが合理的であることを知見した。こうして前記製
錬炉内で効率の良い鉄鉱石の溶融還元が行われる。[Function] Molten pig iron is charged in advance into a smelting furnace as a seed metal, slag-forming agent and carbonaceous material are charged into a slag, oxygen blowing is performed to form slag, iron ore is charged, and charcoal is formed. Reaction heat or heat of dissolution is supplied by the combustion of the carbonaceous material or CO gas, and melting and reduction of the iron ore by the carbonaceous material and [C] in the iron bath proceeds. At this time, the oxygen lance has an oxygen nozzle for decarburization and secondary combustion, and since the discharge angle of the oxygen jet from the decarburization nozzle is within 15 degrees, the oxygen jet is perpendicular to the copper bath surface. Colliding at an angle close to , decarburization is carried out efficiently. Also 2
If the discharge angle of the oxygen shed from the secondary combustion nozzle is close to vertical, the CO2 gas generated by the secondary combustion is reduced by [C] contained in the granulated iron scattered from the front iron bath, and the CO2 gas is reduced to CO2.
Since it is emitted as a gas, it reduces thermal efficiency. There is a possibility. On the other hand, if the discharge angle is close to horizontal, there is a risk that the inner wall refractories of the smelting furnace will be severely worn out, leading to an increase in manufacturing costs. As a result of examining the range of the discharge angle of the secondary combustion nozzle in view of the above problems, it was found that it is reasonable to set this range to 80 degrees or more and 45 degrees or less. In this way, the iron ore is efficiently smelted and reduced in the smelting furnace.
［実施例］
本発明の実施例を添付の第１図及び第２図を参照しなが
ら説明する。第１図は本発明の溶融還元法に用いられる
プロセスの説明図で、第２図は酸素ランス先端部を拡大
して示したもので酸素ジェットの吐出方向と吐出角度に
関する説明図である。[Example] An example of the present invention will be described with reference to the attached FIGS. 1 and 2. FIG. 1 is an explanatory diagram of the process used in the melt reduction method of the present invention, and FIG. 2 is an enlarged view of the tip of the oxygen lance, and is an explanatory diagram regarding the discharge direction and discharge angle of the oxygen jet.
製錬炉１０内には鉄浴１１及びスラグ層１２が形成され
、−副原料である石炭及び造滓剤が装入される第１のシ
ュート１８が前記製錬炉の上部゛に設けられており、ま
た酸素を吹き込む酸素ランス２１が炉内に鉛直に挿入さ
れる。第２図に示す通り前記ランスには脱炭用酸素及び
２次燃焼用酸素を噴出するノズル２２．２３が夫々別の
酸素供給系統に接続されて圧力、流量が個別に制御出来
るように設けられ、更にランス先端の中心には主に炭材
または石灰等の副原料を吹き込むノズル２４が設けられ
ている。第２図で酸素ランス２１の先端に示した矢印は
２８．２９は夫々脱炭用、２次燃焼用の酸素の吹きだし
方向を示す。前記炉の上方には流動層型の反応装置であ
る予熱予備還元炉３０が設けられ、これに鉄鉱石が供給
される第２ のシュー ト３１と、ここで予熱、予備還
元された鉄鉱石が前記製錬炉１０に挿入される第３のシ
ュート３２が設けられ、また予熱予備還元炉３０に製錬
炉１０の発生ガスを供給する導管３３が設けられている
。An iron bath 11 and a slag layer 12 are formed in the smelting furnace 10, and a first chute 18 into which coal as an auxiliary raw material and a slag-forming agent are charged is provided at the upper part of the smelting furnace. Additionally, an oxygen lance 21 for blowing oxygen is vertically inserted into the furnace. As shown in Figure 2, the lance is provided with nozzles 22 and 23 for spouting oxygen for decarburization and oxygen for secondary combustion, each connected to a separate oxygen supply system so that the pressure and flow rate can be controlled individually. Furthermore, a nozzle 24 is provided at the center of the tip of the lance, which mainly blows auxiliary raw materials such as carbonaceous material or lime. The arrows 28 and 29 shown at the tip of the oxygen lance 21 in FIG. 2 indicate the direction in which oxygen is blown out for decarburization and for secondary combustion, respectively. A preheating and pre-reducing furnace 30, which is a fluidized bed type reactor, is provided above the furnace, and a second chute 31 to which iron ore is supplied, and a second chute 31 through which the preheated and pre-reduced iron ore is fed. A third chute 32 inserted into the smelting furnace 10 is provided, and a conduit 33 for supplying gas generated from the smelting furnace 10 to the preheating pre-reduction furnace 30 is provided.
また、予熱予備還元炉８０の排ガスからダストを除去す
るホットサイクロン３４、予熱予備還元炉３０の排出ガ
スの顕熱を利用して蒸気を得る熱交換器３５が設けられ
ている。さらに、前記製錬炉１０の側壁及び炉底には攪
拌用のガスを吹き込む羽口２５．２６が夫々設けられて
いる。以上のように構成された本発明の方法に用いる溶
融還元装置の作用について説明する。原料である鉄鉱石
は第２のシュート３１から予熱予備還元炉８０に挿入さ
れここで製錬炉１０から導管３３を通して発生ガスの供
給を受けて予熱および還元された後、製錬炉１０に第３
のシュート８２を通して装入される。副原料である石炭
、造滓剤は装入装置が簡便である通常のホッパー（図示
せず）から第１のシュートを通して製錬炉１０内に装入
される外、必要に応じて上記酸素ランスに設けたノズル
２４から粉状として装入することも可能である。Further, a hot cyclone 34 that removes dust from the exhaust gas of the preheating preliminary reduction furnace 80 and a heat exchanger 35 that obtains steam by using the sensible heat of the exhaust gas of the preheating preliminary reduction furnace 30 are provided. Furthermore, tuyeres 25 and 26 are provided on the side wall and the bottom of the smelting furnace 10, respectively, for blowing gas for stirring. The operation of the melting and reducing apparatus used in the method of the present invention configured as described above will be explained. Iron ore, which is a raw material, is inserted into a preheating pre-reduction furnace 80 from the second chute 31, where it is preheated and reduced by being supplied with generated gas from the smelting furnace 10 through the conduit 33, and then transferred to the smelting furnace 10. 3
It is charged through the chute 82 of. Coal and slag-forming agent, which are auxiliary raw materials, are charged into the smelting furnace 10 through a first chute from an ordinary hopper (not shown) with a simple charging device. It is also possible to charge it in powder form through a nozzle 24 provided in the.
上記のように製錬炉に装入された主原料及び副原料は製
錬炉の側壁及び炉底に設けられた羽口２５．２６から吹
き込まれる撹拌用ガースによって、既に炉内に形成され
ている鉄浴およびスラグ層とともに十分攪拌される。こ
の撹拌用ガスはＡｒ。As mentioned above, the main raw materials and auxiliary raw materials charged into the smelting furnace are already formed in the furnace by the stirring girth blown through the tuyeres 25 and 26 provided on the side wall and bottom of the smelting furnace. The iron bath and slag layer are thoroughly stirred. This stirring gas is Ar.
Ｎ２等の不活性ガス及びプロセスガスである前記予熱予
備還元炉からの排ガスが用いられる。An inert gas such as N2 and a process gas exhaust gas from the preheating pre-reduction furnace are used.
一方前記酸素ランス２１の脱炭用ノズル２２から供給さ
れる酸素は前記炭材を酸化させて原料である鉄鉱石を還
元するのに十分な熱を供給する。On the other hand, oxygen supplied from the decarburization nozzle 22 of the oxygen lance 21 supplies sufficient heat to oxidize the carbonaceous material and reduce the iron ore that is the raw material.
第２図において前記ノズルからの吹きだし方向２８と酸
素ランスの中、６軸４０の間の角即ち吐出角は１５度以
下にされているので鋼浴に酸素ジェットが十分な速度で
衝突し、脱炭効率が確保される。In FIG. 2, the angle between the blowing direction 28 from the nozzle and the six axes 40 in the oxygen lance, that is, the discharge angle, is set to 15 degrees or less, so that the oxygen jet collides with the steel bath at a sufficient speed and is released. Charcoal efficiency is ensured.
また２次燃焼用ノズル２３からの酸素ジェットの吹きだ
し方向２９の吐出角θは３０度以上４５度以下にされて
いる。此等の角度は第３図に示す検討結果及び製錬炉内
壁の溶損状況から得られたものである。第３図は前記吐
出角θと製錬炉の排出ガスの酸化度 ［０Ｄ＝（Ｃ０２
＋Ｈ２０）／（ＣＯ＋ＣＯ□＋Ｈ２”Ｎ２０） ］との
関係を示すグラフ図で、前記吐出角θが８０度未満であ
ると２次燃焼されたＣ０２が鉄浴から飛散された粒鉄中
の炭素によって還元される割合が多くなり、前記酸化度
（ＯＤ）の低下が著しくなって２次燃焼効率を下げるこ
とになる。また前記吐出角θが４５度を超えると２次燃
焼用の酸素ジェットによる製錬炉内壁の溶損が黴しくな
る。Further, the discharge angle θ in the direction 29 of the oxygen jet from the secondary combustion nozzle 23 is set to be greater than or equal to 30 degrees and less than or equal to 45 degrees. These angles were obtained from the study results shown in Figure 3 and the state of melting damage on the inner wall of the smelting furnace. Figure 3 shows the discharge angle θ and the oxidation degree of the exhaust gas from the smelting furnace [0D=(C02
+ H20)/(CO+CO The reduced ratio increases, and the oxidation degree (OD) decreases significantly, resulting in a decrease in secondary combustion efficiency.Furthermore, if the discharge angle θ exceeds 45 degrees, the production by the oxygen jet for secondary combustion is The melting damage on the inner wall of the furnace becomes moldy.
以上のように酸素ジェットの吐出角度を設定することに
より排出ガスの酸化度が上げられて２次燃焼効率が向上
される。By setting the discharge angle of the oxygen jet as described above, the degree of oxidation of the exhaust gas is increased and the secondary combustion efficiency is improved.
なお、予熱予備還元炉３０からの排ガスはホットサイク
ロン３４でダストが除去された後、蒸気発生器３５で熱
交換されて系外に排出されるが、必要に応じて切り換え
弁３６により製錬炉１０の攪拌用ガスとして利用される
。前記蒸気発生器３５に代えて鉄鉱石予熱装置を設け、
予熱予備還元炉３０の排ガスの顕熱を利用することも可
能である。Incidentally, the exhaust gas from the preheating pre-reduction furnace 30 has dust removed by the hot cyclone 34, and then heat exchanged by the steam generator 35 and discharged outside the system. It is used as a stirring gas. An iron ore preheating device is provided in place of the steam generator 35,
It is also possible to utilize the sensible heat of the exhaust gas from the preheating preliminary reduction furnace 30.
［発明の効果］
本発明め溶融還元法によれば、撹拌用ガスによる鉄浴ま
たはスラグ層の撹拌、２次燃焼用酸素による製錬炉内ガ
スの酸化および脱炭用酸素による鉄浴からのＣの脱炭が
効率良く行われるので、溶融還元の熱効率が向上する。[Effects of the Invention] According to the smelting reduction method of the present invention, stirring of the iron bath or slag layer with the stirring gas, oxidation of the gas in the smelting furnace with the secondary combustion oxygen, and oxidation of the iron bath with the decarburization oxygen are possible. Since C is efficiently decarburized, the thermal efficiency of melting and reduction is improved.
第１図はこの発明の溶融還元法に用いられるプロセスの
説明図、第２図は本発明による酸素ランス先端部の吐出
方向と吐出角度に関する説明図、第３図は２次燃焼用酸
素ジェットの吐出角θとＯＤとの関係を示すグラフ図で
ある。
１０・・・製錬炉、１１・・・鉄浴、１２・・ニスラグ
層、１３・・・第１のシュート、２１・・・酸素ランス
、２２．２３．２４・・・ノズル、２５．２６・・・羽
口、２８．２９・・・酸素ジェットの吹きだし方向、３
０・・・予熱予備還元炉、３１・・・第２のシュート、
３２・・・第３のシュート。Fig. 1 is an explanatory diagram of the process used in the melt reduction method of the present invention, Fig. 2 is an explanatory diagram of the discharge direction and discharge angle of the oxygen lance tip according to the present invention, and Fig. 3 is an explanatory diagram of the oxygen jet for secondary combustion. It is a graph figure showing the relationship between discharge angle theta and OD. DESCRIPTION OF SYMBOLS 10... Smelting furnace, 11... Iron bath, 12... Nisslag layer, 13... First chute, 21... Oxygen lance, 22.23.24... Nozzle, 25.26 ...tuyere, 28.29...oxygen jet blowing direction, 3
0... Preheating preliminary reduction furnace, 31... Second chute,
32...Third shoot.
Claims (1)
造滓剤とともに製錬炉に装入し、脱炭用ノズル及び２次
燃焼用ノズルを有する上吹き酸素ランスから酸素を吹き
込むとともに、製錬炉の側壁または炉底に設けられた羽
口から攪拌用ガスを吹き込んで鉄鉱石を溶融還元する方
法であって、前記脱炭用ノズルの吐出角度が１５度以下
で、かつ前記２次燃焼用ノズルの吐出角度が３０度以上
４５度以下であることを特徴とする溶融還元法。Iron ore is preheated and pre-reduced in a preheating pre-reduction furnace to produce carbonaceous material,
The slag-forming agent is charged into the smelting furnace, and oxygen is blown into it from a top-blowing oxygen lance that has a decarburization nozzle and a secondary combustion nozzle, and stirring is performed through tuyeres installed on the side wall or bottom of the smelting furnace. A method of melting and reducing iron ore by blowing a commercial gas, wherein the discharge angle of the decarburization nozzle is 15 degrees or less, and the discharge angle of the secondary combustion nozzle is 30 degrees or more and 45 degrees or less. A melt reduction method characterized by:
Priority Applications (11)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62260603A JP2596000B2 (en) | 1987-10-15 | 1987-10-15 | Smelting reduction method |
| US07/246,456 US4936908A (en) | 1987-09-25 | 1988-09-19 | Method for smelting and reducing iron ores |
| AU22448/88A AU607807C (en) | 1987-09-25 | 1988-09-20 | Method for smelting and reducing iron ores and apparatus therefor |
| DE88115580T DE3880245T2 (en) | 1987-09-25 | 1988-09-22 | Method and device for melting and reducing iron ores. |
| EP88115580A EP0308925B1 (en) | 1987-09-25 | 1988-09-22 | Method and apparatus for smelting and reducing iron ores |
| AT88115580T ATE88218T1 (en) | 1987-09-25 | 1988-09-22 | METHOD AND APPARATUS FOR MELTING AND REDUCING IRON ORE. |
| CA000578419A CA1336542C (en) | 1987-09-25 | 1988-09-23 | Method for smelting and reducing iron ores and apparatus therefor |
| KR1019880012423A KR910006005B1 (en) | 1987-09-25 | 1988-09-24 | Method for smelting and reducing iron ores |
| CN88106882A CN1014721B (en) | 1987-09-25 | 1988-09-24 | Process and apparatus for melting and reducing iron ore |
| BR888804958A BR8804958A (en) | 1987-09-25 | 1988-09-26 | PROCESS AND APPLIANCE FOR IRON ORE FOUNDATION AND REDUCTION |
| US07/503,805 US4988079A (en) | 1987-09-25 | 1990-04-03 | Apparatus for smelting and reducing iron ores |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62260603A JP2596000B2 (en) | 1987-10-15 | 1987-10-15 | Smelting reduction method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01104706A true JPH01104706A (en) | 1989-04-21 |
| JP2596000B2 JP2596000B2 (en) | 1997-04-02 |
Family
ID=17350231
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62260603A Expired - Fee Related JP2596000B2 (en) | 1987-09-25 | 1987-10-15 | Smelting reduction method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2596000B2 (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62192513A (en) * | 1986-02-17 | 1987-08-24 | Nippon Kokan Kk <Nkk> | Method and apparatus for melt reduction |
-
1987
- 1987-10-15 JP JP62260603A patent/JP2596000B2/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62192513A (en) * | 1986-02-17 | 1987-08-24 | Nippon Kokan Kk <Nkk> | Method and apparatus for melt reduction |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2596000B2 (en) | 1997-04-02 |
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