JPH01104707A - Smelting reduction method - Google Patents
Smelting reduction methodInfo
- Publication number
- JPH01104707A JPH01104707A JP62260604A JP26060487A JPH01104707A JP H01104707 A JPH01104707 A JP H01104707A JP 62260604 A JP62260604 A JP 62260604A JP 26060487 A JP26060487 A JP 26060487A JP H01104707 A JPH01104707 A JP H01104707A
- Authority
- JP
- Japan
- Prior art keywords
- slag
- furnace
- smelting
- iron ore
- oxygen
- 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 48
- 238000000034 method Methods 0.000 title claims abstract description 24
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 66
- 239000002893 slag Substances 0.000 claims abstract description 37
- 229910052742 iron Inorganic materials 0.000 claims abstract description 33
- 239000007789 gas Substances 0.000 claims abstract description 31
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 28
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 28
- 239000001301 oxygen Substances 0.000 claims abstract description 28
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 23
- 238000007664 blowing Methods 0.000 claims abstract description 18
- 239000003575 carbonaceous material Substances 0.000 claims abstract description 12
- 238000002485 combustion reaction Methods 0.000 claims abstract description 10
- 238000002844 melting Methods 0.000 claims abstract description 10
- 230000008018 melting Effects 0.000 claims abstract description 10
- 238000003756 stirring Methods 0.000 claims abstract description 9
- 238000005261 decarburization Methods 0.000 claims abstract description 6
- 239000012159 carrier gas Substances 0.000 claims abstract description 3
- 239000011261 inert gas Substances 0.000 claims abstract description 3
- 239000002184 metal Substances 0.000 claims description 9
- 229910052751 metal Inorganic materials 0.000 claims description 9
- 239000000155 melt Substances 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 abstract 2
- 239000010959 steel Substances 0.000 abstract 2
- 238000006722 reduction reaction Methods 0.000 description 27
- 239000002994 raw material Substances 0.000 description 9
- 230000003647 oxidation Effects 0.000 description 5
- 238000007254 oxidation reaction Methods 0.000 description 5
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 235000011941 Tilia x europaea Nutrition 0.000 description 4
- 239000004571 lime Substances 0.000 description 4
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 2
- 229910000805 Pig iron Inorganic materials 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229910001882 dioxygen Inorganic materials 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000011362 coarse particle Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000004720 fertilization Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000011946 reduction process Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture Of Iron (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
この発明は炭材を燃料および還元剤として用い、鉄鉱石
を転炉型製錬炉内において溶融状態で還元する溶融還元
法に閲する。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a smelting reduction method in which iron ore is reduced in a molten state in a converter-type smelting furnace using carbonaceous materials as a fuel and a reducing agent.
［従来の技ＩＦｉｌ
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 technique IFil The smelting reduction method is an alternative to the blast-furnace pig-making method, and it eliminates the drawbacks of the blast-furnace iron-making method, such as high construction costs and the need for a large site. It has been developed in recent years.
この還元ｉ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を装入され、また還元剤または
燃料となる炭材及び石灰その他の造滓剤を装入された製
錬炉内に酸素が吹き込まれる。そすると炭材が溶銑中に
溶解するとともに、炭材のＣ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Ｃによって還元される。溶銑がら
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及びフォーミンク状
の粒鉄に伝達され、次いで溶銑に伝達される。こうして
鉄鉱石の還元反応に必要な熱が鉄鉱石に伝えられｉ銑が
効率良く製造される。In this reduction i, pre-reduced ore or raw ore is charged as a raw material into hot metal in a smelting furnace, and carbonaceous material and lime and other slag forming agents as a reducing agent or fuel are charged. Oxygen is blown into the furnace. Then, the carbonaceous material is dissolved in the hot metal, and the carbon in 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 C in the carbonaceous material. The CO gas generated from the molten pig iron is secondary combusted by the oxygen gas injected in excess and becomes CO2 gas. The sensible heat of this CO2 gas is transferred to the slag and foamed iron particles covering the hot metal, and then to the hot metal. In this way, the heat necessary for the reduction reaction of the iron ore is transmitted to the iron ore, and i pig iron is efficiently produced.
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、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
とし、従って製錬炉の排゛出ガスは還元性の高い低酸化
度のガスを大量に使用している。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 is set at 60 to 75% before being charged into the smelting furnace. 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、予備還元率を３０％以上にする場合にお
いでは、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、Ｃ０２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。さらに、溶融還元の初期に通常の 造滓剤で
ある石灰または珪石を添加した場合これらの造滓剤は融
点が高く溶解されるまでに時間がかかるという問題があ
った。[Problems to be Solved by the Invention] However, when the preliminary reduction rate is set to 30% or more, the degree of oxidation of the exhaust gas from the smelting furnace is lowered, and a large amount of the gas is required. There is a possibility that the burnup degree of the gas, that is, the secondary combustion efficiency will decrease, and the thermal efficiency of melting and reduction will decrease. Furthermore, when lime or silica stone, which is a common slag-forming agent, is added at the beginning of melt reduction, there is a problem that these slag-forming agents have a high melting point and take time to dissolve.
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、前記排ガスの酸化度を上げて溶融還元の熱
効率を向上させるとともに溶融スラグを早期に形成させ
溶融還元の時間が短縮される溶融還元法を提供しようと
するものである。This invention was made to solve these problems, and it increases the degree of oxidation of the exhaust gas to improve the thermal efficiency of smelting and reduction, and also forms molten slag early to shorten the time for smelting and reduction. It is intended to provide a melt reduction method.
［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、造滓剤もに製錬炉に装入し、
脱炭用人ズル及び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、製錬炉の側壁及び
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、酸素吹錬の初期に低融
点の造滓剤を溶銑トン当り３０ｋｇ乃至１００ｋｇ添加
することを特徴とする。[Means for Solving the Problems] The smelting reduction method according to the present invention involves preheating and pre-reducing iron ore in a pre-heating pre-reducing furnace, and charging the carbon material and slag-forming agent into a smelting furnace.
A method of melting and reducing iron ore by blowing oxygen from a top-blowing oxygen lance that has a decarburization nozzle and a secondary combustion nozzle, and blowing stirring gas from tuyeres provided on the side wall and bottom of the smelting furnace. It is characterized in that 30 kg to 100 kg of a low melting point slag forming agent is added per ton of hot metal at the beginning of oxygen blowing.
［実施例コ 本発明の実施例を添付の図面を参照しながら説明する。[Example code] Embodiments of the invention will be described with reference to the accompanying drawings.
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
明図である。製錬炉１０内には鉄浴１１及びスラグ層１
２が形成され、副原料である石炭及、ぴ造滓剤が装入さ
れる第１のシュー ト１８が前記製錬炉炉の上部に設け
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ている。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
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一ノズル２４が設けられている
。第１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
きれる第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８２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。FIG. 1 is an explanatory diagram of the process used in the melt reduction method of the present invention. Inside the smelting furnace 10 there is an iron bath 11 and a slag layer 1.
A first chute 18 is provided at the upper part of the smelting furnace, into which coal as an auxiliary raw material and a slag agent are charged, and an oxygen lance 21 for blowing oxygen is provided. It is inserted vertically into the furnace. The lance is provided with nozzles 22 and 23 for ejecting oxygen for decarburization and oxygen for secondary combustion, respectively, and furthermore, a nozzle 24 is provided at the center of the tip of the lance for injecting auxiliary materials such as carbonaceous material or lime. It is being The arrow shown at the tip of the oxygen lance 21 in FIG. 1 is 28.
29 indicates the direction in which oxygen is blown out for decarburization and secondary combustion, respectively. A preheating pre-reducing furnace 30, which is a fluidized bed type reactor, is installed above the furnace, and a second chute 31 to which iron ore can be completely supplied, and iron ore that has been preheated and pre-reduced here. A third chute 82 is provided for inserting the gas into the smelting furnace 10, and a conduit 33 for supplying the 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３０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８０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。Further, a hot cyclone 34 that removes dust from the exhaust gas of the preheating preliminary reduction furnace 30 and a heat exchanger 35 that obtains steam by using the sensible heat of the exhaust gas of the preheating preliminary reduction furnace 80 are provided. -Furthermore, tuyeres 25 and 26 are provided on the side wall and bottom of the smelting furnace 10, respectively, for blowing stirring gas into the furnace.
なお−１原料事情、設備費用、操業の容易性等を考慮し
て予熱予備還元炉として、熱効率の良いシャフト炉型も
しくは設備費用が低減され、また操業が容易であるロー
タリキルン型のも−のを設けることは本発明の実施にあ
たって全く支°障はない。In addition, -1 - Considering the raw material situation, equipment cost, ease of operation, etc., a shaft furnace type with good thermal efficiency or a rotary kiln type with reduced equipment cost and easy operation can be used as the preheating pre-reduction furnace. There is no problem in implementing the present invention.
以上のように構成された′本発萌°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゛がら予熱予備還元炉８０に挿入
されここで製錬炉１０がら導管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。The operation of the smelting reduction apparatus constructed as above and used in the present fertilization method will be explained. Iron ore, which is a raw material, is inserted into the preheating pre-reduction furnace 80 through 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. It is charged through the third chute 82. 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、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。The raw materials and auxiliary raw materials charged into the smelting furnace as described above have already been formed in the furnace by the stirring gas blown through the tuyeres 25 and 26 provided on the side wall and bottom of the smelting furnace. Thoroughly stirred together with iron bath and slag layer. As the stirring gas, an inert gas such as Ar or N2 and a process gas such as exhaust gas from the preheating pre-reduction furnace are used.
一方前記酸素ランス２１の脱炭用及び２火燃焼用ノ ズ
ル２２．２３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源を供給す
る。また、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。なお、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。以上の通り製錬炉内のガスは２次
燃焼用酸素によって酸化度は高められ２次燃焼効率は向
上される。On the other hand, oxygen supplied from the decarburization and two-fire combustion nozzles 22 and 23 of the oxygen lance 21 provides a heat source sufficient to oxidize the carbonaceous material and reduce the iron ore that is the raw material. Further, the exhaust gas from the preheating preliminary reduction furnace 30 is removed from dust by a hot cyclone 34, and then passed through a steam generator 35.
The gas is heat-exchanged and discharged outside the system, but is used as stirring gas for the smelting furnace 10 by the switching valve 36 if necessary. Note that it is also possible to provide an iron ore preheating device in place of the steam generator 35 and utilize the sensible heat of the exhaust gas from the preheating preliminary reduction furnace 30. As described above, the degree of oxidation of the gas in the smelting furnace is increased by the secondary combustion oxygen, and the secondary combustion efficiency is improved.
次に鉄鉱石の装入以前のスラグ形成について説明する。Next, slag formation before charging iron ore will be explained.
鉄鉱石装入前は製錬炉１０には所謂種湯と称する溶銑が
装入されており、酸素吹錬開始後に炭材または造滓剤が
添加される。ここで添加される転炉滓、風砕スラグ、高
炉滓または電気炉滓は低融点の造滓剤であるので酸素吹
錬により早期に溶解されて溶融スラグ層が形成される。Before charging the iron ore, hot metal called so-called seed hot water is charged into the smelting furnace 10, and after oxygen blowing starts, carbon material or slag-forming agent is added. Since the converter slag, air crushed slag, blast furnace slag, or electric furnace slag added here is a slag-forming agent with a low melting point, it is quickly melted by oxygen blowing to form a molten slag layer.
添加する量は溶銑トン当り３０ｋｇ乃至１００ｋｇであ
る。３０ｋｇ未満では媒溶剤として不十分であり１００
ｋｇ以上では媒溶剤としての効果が頭打となる。通常、
造滓剤は製錬炉の上部から塊状または粗粒の状態で投入
されるが、ざらに造滓剤の溶解時間を短縮する必要のあ
る場合には前記造滓剤を粉状として酸素ランスのノズル
２４または製錬炉１０の炉壁に設けた羽口２５．２６か
らキャリアーガスと共に吹き込むことが有効である。以
上のようにして溶融スラグ層が形成された後、主原料で
ある鉄鉱石が製錬炉１０内に装入され、鉄鉱石の溶融還
元が行われる。The amount added is 30 kg to 100 kg per ton of hot metal. If it is less than 30 kg, it is insufficient as a solvent and 100
If it weighs more than 1 kg, its effectiveness as a solvent reaches a plateau. usually,
The slag-forming agent is introduced from the top of the smelting furnace in the form of lumps or coarse particles, but if it is necessary to shorten the dissolution time of the slag-forming agent, the slag-forming agent is turned into powder and placed in the oxygen lance. It is effective to blow in together with the carrier gas through the nozzle 24 or the tuyeres 25, 26 provided on the wall of the smelting furnace 10. After the molten slag layer is formed as described above, iron ore, which is the main raw material, is charged into the smelting furnace 10, and the iron ore is smelted and reduced.
造滓剤として本発明の方法により転炉滓８０ｋｇ／Ｔ（
溶銑トン当り、以下同じ）を添加した場合と従来例によ
り石灰６０ｋｇ／Ｔ、珪石２０ｋ ｇ ／ Ｔ ｌｌ：
添加した場合について、吹錬開始から鉄鉱石装入までの
時間を比較すると本発明の方法が１４分であるのに対し
従来例ではこれが２０分であった。Converter slag 80kg/T (
Lime: 60 kg/T, silica stone: 20 kg/T ll:
Comparing the time from the start of blowing to the charging of iron ore in the case of adding iron ore, it was 14 minutes in the method of the present invention, whereas it was 20 minutes in the conventional example.
［発明の効果］
本発明の溶融還元法によれば、撹拌用ガスによる鉄浴お
よびスラグ層の撹拌並びに２次燃焼用酸素による製錬炉
内ガスの酸化が行われるので、溶融還元の熱効率が向上
し、また、酸素吹錬の初期に低融点の造滓剤を添加する
ので、早期に鉄鉱石を装入して溶融還元時間を短縮する
ことが出来る。[Effects of the Invention] According to the smelting reduction method of the present invention, the iron bath and slag layer are stirred by the stirring gas, and the gas in the smelting furnace is oxidized by the secondary combustion oxygen, so the thermal efficiency of smelting reduction is improved. Furthermore, since a low melting point slag forming agent is added at the beginning of oxygen blowing, iron ore can be charged early and the smelting reduction time can be shortened.
第１図は、この発明の溶融還元法に用いられるプロセス
の説明図である。
１０・・・製錬炉、１１・・・鉄浴、１２・・・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、３０・・・予熱予備還元炉。FIG. 1 is an explanatory diagram of the process used in the melt reduction method of the present invention. DESCRIPTION OF SYMBOLS 10... Smelting furnace, 11... Iron bath, 12... Slag layer, 13... First chute, 21... Oxygen lance, 22.23.24... Nozzle, 25, 26...
Tuyere, 30... Preheating preliminary reduction furnace.
Claims (4)
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、製錬炉の側壁及び炉底に
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つて、酸素吹錬の初期に低融点の造
滓剤を溶銑トン当り３０ｋｇ乃至１００ｋｇ添加するこ
とを特徴とする溶融還元法。(1) Iron ore is charged into a smelting furnace along with carbonaceous material and slag-forming agent,
A method of melting and reducing iron ore by blowing oxygen through a top-blown oxygen lance that has nozzles for decarburization and secondary combustion, and blowing stirring gas through tuyeres installed on the side walls and bottom of the smelting furnace. A smelting reduction method characterized in that 30 kg to 100 kg of a low melting point slag forming agent is added per ton of hot metal at the beginning of oxygen blowing.
電気炉滓であることを特徴とする特許請求の範囲第１項
に記載の溶融還元法。(2) The smelting reduction method according to claim 1, wherein the slag-forming agent is converter slag, blast furnace slag, blast furnace slag, or electric furnace slag.
製錬炉の炉壁に設けた羽口からキャリアガスと共に吹き
込んでスラグに添加されることを特徴とする特許請求の
範囲第１項もしくは第２項に記載の溶融還元法。(3) The slag-forming agent is added to the slag by being blown into the slag together with a carrier gas through a nozzle provided in a top-blowing oxygen lance or a tuyere provided in the wall of a smelting furnace. Or the melt reduction method described in Section 2.
スまたはプロセスガスであることを特徴とする特許請求
の範囲第１項乃至第３項に記載の溶融還元法。(4) The melting reduction method according to any one of claims 1 to 3, wherein the stirring gas is an inert gas such as Ar or N_2 or a process gas.
Priority Applications (11)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62260604A JP2596001B2 (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. |
| AT88115580T ATE88218T1 (en) | 1987-09-25 | 1988-09-22 | METHOD AND APPARATUS FOR MELTING AND REDUCING IRON ORE. |
| EP88115580A EP0308925B1 (en) | 1987-09-25 | 1988-09-22 | Method and apparatus for smelting and reducing iron ores |
| CA000578419A CA1336542C (en) | 1987-09-25 | 1988-09-23 | Method for smelting and reducing iron ores and apparatus therefor |
| CN88106882A CN1014721B (en) | 1987-09-25 | 1988-09-24 | Process and apparatus for melting and reducing iron ore |
| KR1019880012423A KR910006005B1 (en) | 1987-09-25 | 1988-09-24 | Method for smelting and reducing iron ores |
| 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 |
|---|---|---|---|
| JP62260604A JP2596001B2 (en) | 1987-10-15 | 1987-10-15 | Smelting reduction method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01104707A true JPH01104707A (en) | 1989-04-21 |
| JP2596001B2 JP2596001B2 (en) | 1997-04-02 |
Family
ID=17350243
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62260604A Expired - Lifetime JP2596001B2 (en) | 1987-09-25 | 1987-10-15 | Smelting reduction method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2596001B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007519824A (en) * | 2004-01-30 | 2007-07-19 | テクノロジカル リソーシズ プロプライエタリー リミテッド | Steel and steel making |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6164807A (en) * | 1984-09-03 | 1986-04-03 | Nippon Steel Corp | Melt reduction method of iron ore |
| JPS62185812A (en) * | 1986-02-10 | 1987-08-14 | Nippon Kokan Kk <Nkk> | Smelting and reduction iron making method |
-
1987
- 1987-10-15 JP JP62260604A patent/JP2596001B2/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6164807A (en) * | 1984-09-03 | 1986-04-03 | Nippon Steel Corp | Melt reduction method of iron ore |
| JPS62185812A (en) * | 1986-02-10 | 1987-08-14 | Nippon Kokan Kk <Nkk> | Smelting and reduction iron making method |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007519824A (en) * | 2004-01-30 | 2007-07-19 | テクノロジカル リソーシズ プロプライエタリー リミテッド | Steel and steel making |
| US7935172B2 (en) | 2004-01-30 | 2011-05-03 | Technological Resources Pty Limited | Ironmaking and steelmaking |
| US8298317B2 (en) | 2004-01-30 | 2012-10-30 | Technological Resources Pty. Limited | Ironmaking and steelmaking |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2596001B2 (en) | 1997-04-02 |
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