JPS62230907A - Production of molten metal from powdery ore - Google Patents
Production of molten metal from powdery oreInfo
- Publication number
- JPS62230907A JPS62230907A JP61073888A JP7388886A JPS62230907A JP S62230907 A JPS62230907 A JP S62230907A JP 61073888 A JP61073888 A JP 61073888A JP 7388886 A JP7388886 A JP 7388886A JP S62230907 A JPS62230907 A JP S62230907A
- Authority
- JP
- Japan
- Prior art keywords
- solid reducing
- reducing agent
- carbon
- furnace
- based solid
- 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
- 239000002184 metal Substances 0.000 title claims abstract description 14
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 14
- 238000004519 manufacturing process Methods 0.000 title claims description 8
- 239000007787 solid Substances 0.000 claims abstract description 67
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 65
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 60
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 60
- 238000009826 distribution Methods 0.000 claims abstract description 10
- 239000007789 gas Substances 0.000 claims description 23
- 239000002245 particle Substances 0.000 claims description 23
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 12
- 229910052760 oxygen Inorganic materials 0.000 claims description 12
- 239000001301 oxygen Substances 0.000 claims description 12
- 229910044991 metal oxide Inorganic materials 0.000 claims description 4
- 150000004706 metal oxides Chemical class 0.000 claims description 4
- 239000003575 carbonaceous material Substances 0.000 claims description 2
- 239000000155 melt Substances 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 9
- 238000002347 injection Methods 0.000 description 8
- 239000007924 injection Substances 0.000 description 8
- 239000000843 powder Substances 0.000 description 6
- 238000003723 Smelting Methods 0.000 description 5
- 238000007664 blowing Methods 0.000 description 3
- 239000011362 coarse particle Substances 0.000 description 3
- 239000000571 coke Substances 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 229910000805 Pig iron Inorganic materials 0.000 description 2
- 238000003763 carbonization Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000010419 fine particle Substances 0.000 description 2
- 239000012256 powdered iron Substances 0.000 description 2
- 230000000717 retained effect Effects 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- VZSRBBMJRBPUNF-UHFFFAOYSA-N 2-(2,3-dihydro-1H-inden-2-ylamino)-N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]pyrimidine-5-carboxamide Chemical compound C1C(CC2=CC=CC=C12)NC1=NC=C(C=N1)C(=O)NCCC(N1CC2=C(CC1)NN=N2)=O VZSRBBMJRBPUNF-UHFFFAOYSA-N 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005188 flotation Methods 0.000 description 1
- 238000007885 magnetic separation Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000005456 ore beneficiation Methods 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 239000000243 solution 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
- C21B13/0013—Making spongy iron or liquid steel, by direct processes obtaining iron or steel in a molten state introduction of iron oxide into a bath of molten iron containing a carbon reductant
- C21B13/002—Reduction of iron ores by passing through a heated column of carbon
-
- 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
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】
本発明は、金属酸化物を含有する粉状鉱石からの溶融金
属製造方法に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing molten metal from powdered ore containing metal oxides.
鉄鋸石その他の金属鉱石ｆｉ源は粉鉱石が多くなり、今
後益々粉鉱石の割合が増加する傾向にある。特に低品位
鉱石の品位を向上させるために。Powder ore is becoming more common as a fi source for sawstone and other metal ores, and the proportion of powder ore is likely to increase in the future. Especially to improve the grade of low-grade ores.
浮選、磁選などの選鉱が行われ、粒鉱の比率が増加する
ことが予想される。粉鉱石を塊成化した後、これを還元
して溶融金属を得る方法は塊成化のためのコストが必要
であるため、粉状鉱石を塊成化することなく、流動層を
用いて還元する方法および装置が開発されている。The ratio of grain ore is expected to increase as ore beneficiation such as flotation and magnetic separation is carried out. The method of agglomerating fine ore and then reducing it to obtain molten metal requires the cost of agglomeration, so it is possible to reduce the ore using a fluidized bed without agglomerating the fine ore. Methods and devices have been developed to do so.
本発明者らはさきに特願昭６０−１９３９１４において
竪型還元炉内に炭素系固体還元剤の充填層とその上方に
炭素系固体還元剤の流動層とを維持し、粉状鉱石を酸素
含有気体と共に流動層に装入し酸素含有気体を炭素系固
体還元剤の充填層に吹込み、粉状鉱石を溶融還元する溶
融金属製造方：Ｉｔ＊、坦安１伽
このような技術においては、
（１）従来は、その操業時の炉内温度、圧力、ガス流量
などの炉内条件から炉内の実際ガス流量を計算し、終端
速度Ｕｉ （粒子が系外に飛びだすガス流速）のｎ倍
相当のガス流速に対応する炭素系固体還元剤粒径以上の
ものを炉内に装入していた。この粒径より小さい篩下の
留分は未利用で。The present inventors previously proposed in Japanese Patent Application No. 60-193914 that they maintained a packed bed of carbon-based solid reducing agent in a vertical reduction furnace and a fluidized bed of carbon-based solid reducing agent above the bed, and oxygenated powder ore. Molten metal production method in which powdered ore is melted and reduced by charging the oxygen-containing gas into a fluidized bed and blowing the oxygen-containing gas into a packed bed of a carbon-based solid reducing agent: It*, Dan'an 1 (1) Conventionally, the actual gas flow rate in the furnace is calculated from the furnace conditions such as temperature, pressure, and gas flow rate during operation, and n of the terminal velocity Ui (gas flow rate at which particles fly out of the system) is calculated. Carbon-based solid reducing agent particles with a particle size larger than that corresponding to double the gas flow rate were charged into the furnace. The subsieve fraction smaller than this particle size is unused.
あった。there were.
（２）発生または入手した炭素系固体還元剤は微粉を含
めて全量を炉内に装入していた。従って微粉は排ガスと
ともに飛散し、その顕熱を有効利用することは困難であ
った。(2) The entire amount of generated or obtained carbon-based solid reducing agent, including fine powder, was charged into the furnace. Therefore, the fine powder is scattered along with the exhaust gas, making it difficult to effectively utilize its sensible heat.
本発明は、金属酸化物を含有する粉状鉱石を塊成化する
ことなく、竪型還元炉を用いて炭素系固体還元剤と酸素
含有ガスにより粉状鉱石を溶融還元するプロセスにおい
て、炭素系固体還元剤の使用粒径範囲を拡大して炭素系
固体還元剤の使用歩留を向上することを目的とする。The present invention provides a process for melting and reducing powdery ore containing metal oxides using a carbon-based solid reducing agent and oxygen-containing gas using a vertical reduction furnace without agglomerating powdery ore containing carbon-based metal oxides. The purpose is to expand the usable particle size range of solid reducing agents and improve the usage yield of carbon-based solid reducing agents.
また、充填層に滞留する粗粒炭素系固体還元剤と流動層
に滞留する細粒炭素系固体還元剤のそれぞれの滞留量と
、石炭乾留炉で発生するチャーや前工程で発生する炭材
の粒度の分布のバランスをとって操業する必要がある。In addition, the amount of the coarse carbon-based solid reducing agent retained in the packed bed and the fine-grained carbon-based solid reducing agent retained in the fluidized bed, as well as the amount of char generated in the coal carbonization furnace and carbonaceous material generated in the previous process, It is necessary to operate with a balanced particle size distribution.
本発明は、竪型還元炉内に炭素系固体還元剤の充填層と
その上方に炭素系固体還元剤の流動層とを維持し１円周
方向複数箇所に設けられた羽口から酸素含有気体を炭素
系固体還元剤の充填層に吹込み、金属〜化物を含有する
粉状鉱石を酸素含有気体と共に流動層に装入して、溶融
還元する溶融金属製造方法において、竪型還元炉に装入
する炭素系固体還元剤を、炉頂からは温度、圧力、ガス
流速および固体（炭素系固体還元剤）の見掛密度、ガス
の密度、粘性係数から計算される終端速度相当径の２倍
以上の粒径の炭素系固体還元剤を混入し、終端速度相当
径の２倍未満の粒径の炭素系固体還元剤を、炉頂から装
入される炭素系固体還元剤の粒径分布に応じて、固体還
元剤の流動層など固体還元剤の充填層に分配装入するこ
とを問題解決の手段とする。The present invention maintains a packed bed of a carbon-based solid reducing agent and a fluidized bed of the carbon-based solid reducing agent above the packed bed in a vertical reduction furnace, and supplies oxygen-containing gas from tuyeres provided at multiple locations in the circumferential direction. In a molten metal production method, in which powdered ore containing metals and compounds is charged into a fluidized bed together with an oxygen-containing gas and melted and reduced, the powdered ore is charged into a vertical reduction furnace. From the top of the furnace, the carbon-based solid reducing agent is heated at a temperature twice the terminal velocity equivalent diameter calculated from the temperature, pressure, gas flow rate, apparent density of the solid (carbon-based solid reducing agent), gas density, and viscosity coefficient. The carbon-based solid reducing agent with a particle size of less than twice the terminal velocity equivalent diameter is mixed into the particle size distribution of the carbon-based solid reducing agent charged from the top of the furnace. Accordingly, a solution to the problem is to distribute the solid reducing agent into a packed bed, such as a fluidized bed of the solid reducing agent.
〔作用〕 ゛
本発明では炭素系固体還元剤のうち、終端速度Ｕ、相当
径の２倍以上の粒径の炭素系固体還元剤を溶融還元炉の
炉頂から装入すると共にこの炉頂から装入する炭素系固
体還元剤の粒度分布に応じて、相当径の２倍未満の炭素
系固体還元剤を粉状鉱石吹込羽口（上段羽口）または炭
素系固体還元剤充填層吹込羽口（下段羽口）から吹込む
、この吹込に当ってその上、下段羽口からのそれぞれの
吹込量配分は、炉頂から装入する炭素系固体還元剤の粒
度によって定める。[Function] ゛In the present invention, among the carbon-based solid reducing agents, a carbon-based solid reducing agent having a particle size of at least twice the terminal velocity U and the equivalent diameter is charged from the top of the melting reduction furnace, and the carbon-based solid reducing agent is charged from the top of the furnace. Depending on the particle size distribution of the charged carbon-based solid reducing agent, the carbon-based solid reducing agent with a size less than twice the equivalent diameter is inserted into the powdered ore injection tuyere (upper tuyere) or the carbon-based solid reducing agent packed bed injection tuyere. The distribution of the amount of air injected from the lower tuyere (lower tuyere) is determined by the particle size of the carbon-based solid reducing agent charged from the top of the furnace.
充填層に吹込羽口から吹込まれた微粉炭素系固体還元剤
は酸素によって燃焼し、その燃焼に消費された酸素分だ
け粗粒炭素系固体還元剤の燃焼量を削減する。The fine carbon-based solid reducing agent injected into the packed bed from the tuyere is combusted by oxygen, and the amount of coarse carbon-based solid reducing agent combusted is reduced by the amount of oxygen consumed in the combustion.
粉状鉱石吹込羽口から吹込まれた炭素系固体還元剤は酸
素により燃焼し高温粒となり、同伴して吹込まれる鉱石
が溶融して吹込炭素系固体還元剤の表面に溶着するので
、溶融還元が促進されると共に炭素系固体還元剤が有効
利用され、炭素系固体還元剤原単位が向上する。The carbon-based solid reducing agent injected from the powdered ore injection tuyere is combusted by oxygen and becomes high-temperature particles, and the accompanying ore injected melts and welds to the surface of the blown carbon-based solid reducing agent, resulting in smelting reduction. is promoted, the carbon-based solid reducing agent is effectively utilized, and the carbon-based solid reducing agent consumption rate is improved.
このように微粒炭素系固体還元剤を上、下段羽口から吹
込むことにより、従来、流動層から飛散してしまう炭素
系固体還元割分や、上方から装入することが適当でなか
った炭素系固体還元剤を有効に利用できると共に、粗粒
炭素系固体還元剤の粒径分布に応じて、下段羽口に吹込
む微粉炭素系固体還元剤を増減することにより、炭素系
固体還元剤充填層の降下速度を調節することができ、充
填層の層高を適切な範囲に制御することが容易にでき、
炉の安定操業をすることができる。By injecting the fine carbon-based solid reducing agent from the upper and lower tuyeres in this way, the carbon-based solid reduced fraction that would conventionally scatter from the fluidized bed and the carbon that was not suitable to be charged from above can be removed. By increasing or decreasing the amount of finely divided carbon-based solid reducing agent injected into the lower tuyere according to the particle size distribution of the coarse carbon-based solid reducing agent, the carbon-based solid reducing agent can be filled effectively. The descending speed of the bed can be adjusted, and the height of the packed bed can be easily controlled within an appropriate range.
The furnace can be operated stably.
なお終端速度相当径は温度、圧力、ガス流速、固体（炭
素系固体還元剤）の見掛密度、ガスの密度、粘性係数を
用いてＡ１１ｅｎの式およびＮｅｗｔｏｎの式から計算
することができる。Note that the terminal velocity equivalent diameter can be calculated from the A11en formula and Newton's formula using temperature, pressure, gas flow rate, apparent density of the solid (carbon-based solid reducing agent), gas density, and viscosity coefficient.
第１図に示す溶融還元システムを用いて本発明方法を実
施した。The method of the present invention was carried out using the melt reduction system shown in FIG.
溶融還元炉６には炭素系固体還元剤予備処理炉１４から
炭素系固体還元剤を供給して、還元炉６内に充填層４と
流動層５を形成する。還元炉６の下段羽口３から酸素含
有気体２を充填層４中に吹込み、この気体によって充填
層４内の固体還元剤を燃焼させると共に、この気体は充
填層４の上方に流動層５を形成する流動化ガスとして作
用する。流動層５には鉱石予備処理炉１６で流動予備還
元された粉状鉱石を粉状鉱石装入口（上段羽口）８から
装入する。この鉱石は流動層内で溶融して充填層４を通
って炉底に滴下し、その滴下過程において溶融還元され
、溶融金属１０、溶融スラグ１１となって炉底に溜まり
、出銑口１２から排出される。A carbon-based solid reducing agent is supplied from a carbon-based solid reducing agent pretreatment furnace 14 to the melting reduction furnace 6 to form a packed bed 4 and a fluidized bed 5 in the reduction furnace 6 . Oxygen-containing gas 2 is blown into the packed bed 4 from the lower tuyere 3 of the reduction furnace 6, and the solid reducing agent in the packed bed 4 is combusted by this gas. acts as a fluidizing gas to form Powdered ore that has been fluidized and prereduced in an ore pretreatment furnace 16 is charged into the fluidized bed 5 through a powdery ore charging port (upper tuyere) 8 . This ore is melted in the fluidized bed, passes through the packed bed 4, and drips onto the furnace bottom. During the dripping process, it is melted and reduced, becoming molten metal 10 and molten slag 11, which accumulate at the furnace bottom, and are passed through the tap hole 12. be discharged.
溶融還元炉６から排出された排ガス１３は鉱石予備処理
１６の還元ガスとして、また炭素系固体還元剤予備処理
炉１４の乾留ガスとして利用される。The exhaust gas 13 discharged from the smelting reduction furnace 6 is used as a reducing gas for the ore pretreatment 16 and as carbonization gas for the carbon-based solid reducing agent pretreatment furnace 14.
以上のシステムにおいて、実施例は、炭素系固体還元剤
予備処理炉から排出された炭素系固体還元剤を粗粒と細
粒に分別し、粗粒１５は還元炉６の」−力から炉内に挿
入し、細粒１５ａは粗粒とは別に−Ｆ段羽口８、下段羽
口３から吹込まれる。In the above system, in the embodiment, the carbon-based solid reducing agent discharged from the carbon-based solid reducing agent pretreatment furnace is separated into coarse particles and fine particles, and the coarse particles 15 are separated from the "-force" in the reducing furnace 6. The fine grains 15a are blown into the -F stage tuyere 8 and the lower stage tuyere 3 separately from the coarse grains.
上段羽口８と下段羽口３からそれぞれ吹込まれる微粉炭
素系固体還元剤の量は粗粒炭素系固体還元剤１５の粒度
分布に応じて吹込量を定めてそれぞれ吹込まれる。The amount of the fine carbon-based solid reducing agent blown into each of the upper tuyere 8 and the lower tuyere 3 is determined depending on the particle size distribution of the coarse-grained carbon-based solid reducing agent 15.
本発明による溶融金属の製造を炉径１．２ｍの還元炉で
行った結果を次に示す。The results of producing molten metal according to the present invention in a reduction furnace with a furnace diameter of 1.2 m are shown below.
実施例１
１）粉状鉄鉱石
銘柄：ＭＢＲ−ＰＢ
粒径：主に１５０メツシユ以下
２）供給炭素系固体還元剤
種類：高炉用コークス
粒径：粒径分布 ２０”１０ｍｍ ３４％１０〜５ｍ
ｍ ２７％
５〜１ｍｍ ２４％
一１ｍｍ １５％
（終端速度相当径０．５ｍｍ）
炉頂装入分 ２０〜ｉｎｎ
羽口吹込分 Ｉｎｍ未満
供給量：１０４０ｋｇ／Ｈ
流動層吹込：９５ｋｇ／Ｈ
（全装入量の９．１％）
充填層吹込：６１ｋｇ／Ｈ
（全装入量の５．９％）
３）銑鉄生産量：１１．８ｔ／日
実施例２
１）粉状鉄鉱石
銘柄：ＭＢＲ−ＰＢ
粒径：主に１５０メツシユ以下
２）供給炭素系固体還元剤
種類：高炉用コークス
粒径：粒径分布 ２０〜１０ｍｍ２８％１０〜５ｍｍ２
８％
５〜１ ｍ ｍ ２５％
−１ｍｍ １９％
（終端速度相当径０．５ｍｍ）
炉頂装入分 ２０ ｗ １ ｍ ｍ
羽口吹込分 １ｍｍ未満
供給量：９９７ｋｇ／Ｈ
流動層吹込ニア８ｋｇ／Ｈ
（全装入量の７．８％）
充填層吹込：１１１ｋｇ／Ｈ
（全装入量の１１１％）
（実施例１に比較し、供給コークスの粗粒分が少なかっ
たため、充填層吹込分の装入率が多い、）
３）銑鉄生産量：１１．２ｔ／日
上記操業条件による操業によって溶融還元炉を安定的に
操業することができた。Example 1 1) Powdered iron ore brand: MBR-PB Particle size: Mainly 150 mesh or less 2) Supply carbon-based solid reducing agent type: Blast furnace coke Particle size: Particle size distribution 20"10mm 34%10~5m
m 27% 5-1mm 24% -1mm 15% (Terminal speed equivalent diameter 0.5mm) Furnace top charging 20-inn Tuyere injection Less than Inm supply: 1040kg/H Fluidized bed injection: 95kg/H (Total 9.1% of the charging amount) Packed bed injection: 61 kg/H (5.9% of the total charging amount) 3) Pig iron production: 11.8 t/day Example 2 1) Powdered iron ore brand: MBR -PB Particle size: Mainly 150 mesh or less 2) Supply carbon-based solid reducing agent Type: Blast furnace coke Particle size: Particle size distribution 20-10mm28%10-5mm2
8% 5-1 mm 25% -1 mm 19% (Terminal velocity equivalent diameter 0.5 mm) Furnace top charge 20 w 1 mm Tuyere injection less than 1 mm Supply amount: 997 kg/H Fluidized bed injection near 8 kg/ H (7.8% of the total charging amount) Packed bed blowing: 111 kg/H (111% of the total charging amount) (Compared to Example 1, since the coarse particle content of the supplied coke was smaller, the packed bed blowing amount 3) Pig iron production: 11.2 t/day The smelting reduction furnace could be stably operated under the above operating conditions.
以上のように、本発明によれば次のような優れた効果が
ある。As described above, the present invention has the following excellent effects.
ａ）従来細粒ないし微粉炭素系固体還元剤は別のプロセ
スで使用していたが本発明により同一・プロセスにおい
て使用可能となり、充＠層流動層の層高を容易に制御で
きると共に炭素系固体還元剤原単位を低減することが可
能となった。a) Conventionally, fine particles or fine powder carbon-based solid reducing agents were used in separate processes, but with the present invention, they can be used in the same process, making it possible to easily control the bed height of a packed bed fluidized bed, and reducing carbon-based solids. It has become possible to reduce the unit consumption of reducing agent.
ｂ）溶融還元炉排ガス中のダスト処理において、飛散炭
素系固体還元剤の発生量が減少し、処理工数が低減した
。b) In the treatment of dust in the exhaust gas of the smelting reduction furnace, the amount of scattered carbon-based solid reducing agent generated was reduced, and the number of processing steps was reduced.
第１図は本発明方法の適用される竪型還元炉の概略縦断
面図である。
１・・・粉状鉱石
２・・・酸素を含む気体
３．８・・・羽口
４・・・炭素系固体還元剤の充填層
５・・・炭素系固体還元剤の流動層
６・・・竪型溶融還元炉
１０・・・溶融金属
１１・・・溶融スラグ
１２・・・出銑口FIG. 1 is a schematic longitudinal sectional view of a vertical reduction furnace to which the method of the present invention is applied. 1...Powdered ore 2...Gas containing oxygen 3.8...Tuyere 4...Filled bed of carbon-based solid reducing agent 5...Fluidized bed of carbon-based solid reducing agent 6...・Vertical smelting reduction furnace 10... Molten metal 11... Molten slag 12... Tapping port
Claims (1)
方に炭素系固体還元剤の流動層とを維持し、円周方向複
数箇所に設けられた羽口から酸素含有気体を炭素系固体
還元剤の充填層に吹込み、金属酸化物を含有する粉状鉱
石を酸素含有気体と共に流動層に装入して、溶融還元す
る溶融金属製造方法において、竪型還元炉に装入する炭
素系固体還元剤を、炉頂から装入するものと羽口から装
入するものとに分け、炉頂からは終端速度相当径の２倍
以上の粒径のものを装入し、終端速度相当径の２倍未満
の粒径の炭素系固体還元剤は、上記炉頂から装入される
炭材の粒径分布に応じ て、固体還元剤の流動層と固体還元剤の充填層とに分配
して装入することを特徴とする粉状鉱石からの溶融金属
製造方法。[Claims] 1. A packed bed of a carbon-based solid reducing agent and a fluidized bed of a carbon-based solid reducing agent are maintained above the packed bed of a carbon-based solid reducing agent in a vertical reduction furnace, and tuyeres provided at multiple locations in the circumferential direction Vertical reduction is a molten metal production method in which oxygen-containing gas is blown into a packed bed of a carbon-based solid reducing agent, and powdered ore containing metal oxides is charged into a fluidized bed together with the oxygen-containing gas to melt and reduce. The carbon-based solid reducing agent charged into the furnace is divided into those charged from the top of the furnace and those charged from the tuyere, and those with a particle size of more than twice the terminal velocity equivalent diameter are charged from the top of the furnace. The carbon-based solid reducing agent with a particle size less than twice the terminal velocity equivalent diameter is separated into a fluidized bed of the solid reducing agent and a solid reducing agent depending on the particle size distribution of the carbon material charged from the top of the furnace. A method for producing molten metal from powdered ore, characterized by distributing and charging the molten metal into a packed bed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61073888A JPH062894B2 (en) | 1986-03-31 | 1986-03-31 | Method for producing molten metal from powdered ore |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61073888A JPH062894B2 (en) | 1986-03-31 | 1986-03-31 | Method for producing molten metal from powdered ore |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62230907A true JPS62230907A (en) | 1987-10-09 |
| JPH062894B2 JPH062894B2 (en) | 1994-01-12 |
Family
ID=13531197
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61073888A Expired - Lifetime JPH062894B2 (en) | 1986-03-31 | 1986-03-31 | Method for producing molten metal from powdered ore |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH062894B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5131942A (en) * | 1987-06-30 | 1992-07-21 | Kawasaki Steel Corporation | Method for producing molten metal from powder state ore |
-
1986
- 1986-03-31 JP JP61073888A patent/JPH062894B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5131942A (en) * | 1987-06-30 | 1992-07-21 | Kawasaki Steel Corporation | Method for producing molten metal from powder state ore |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH062894B2 (en) | 1994-01-12 |
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