JP2010215983A - Melting/reducing method - Google Patents
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- JP2010215983A JP2010215983A JP2009065664A JP2009065664A JP2010215983A JP 2010215983 A JP2010215983 A JP 2010215983A JP 2009065664 A JP2009065664 A JP 2009065664A JP 2009065664 A JP2009065664 A JP 2009065664A JP 2010215983 A JP2010215983 A JP 2010215983A
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- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000002844 melting Methods 0.000 title abstract description 8
- 230000008018 melting Effects 0.000 title abstract description 8
- 239000000843 powder Substances 0.000 claims abstract description 58
- 239000000446 fuel Substances 0.000 claims abstract description 57
- 238000010438 heat treatment Methods 0.000 claims abstract description 54
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 claims abstract description 32
- 229910001882 dioxygen Inorganic materials 0.000 claims abstract description 32
- 229910052751 metal Inorganic materials 0.000 claims abstract description 21
- 239000002184 metal Substances 0.000 claims abstract description 21
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000001301 oxygen Substances 0.000 claims abstract description 14
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 14
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 34
- 239000002994 raw material Substances 0.000 claims description 30
- 239000008187 granular material Substances 0.000 claims description 28
- 238000003723 Smelting Methods 0.000 claims description 25
- 238000007664 blowing Methods 0.000 claims description 21
- 229910052742 iron Inorganic materials 0.000 claims description 17
- 238000002485 combustion reaction Methods 0.000 claims description 7
- 239000000155 melt Substances 0.000 claims description 2
- 238000006722 reduction reaction Methods 0.000 description 27
- 239000007789 gas Substances 0.000 description 12
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 10
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 8
- 229910044991 metal oxide Inorganic materials 0.000 description 6
- 150000004706 metal oxides Chemical class 0.000 description 6
- 239000001294 propane Substances 0.000 description 5
- 239000011651 chromium Substances 0.000 description 4
- 229910052804 chromium Inorganic materials 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 3
- 239000000498 cooling water Substances 0.000 description 3
- 238000007670 refining Methods 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000003575 carbonaceous material Substances 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
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- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
Description
本発明は、粉体加熱バーナーのバーナー火炎で金属の酸化物や酸化物系鉱石等の粉体または粒体を加熱して溶解し、さらに還元性ガス(たとえば酸素ガス等)を用いて還元を行ない、金属溶湯を得る溶融還元方法に関するものである。 In the present invention, a powder or granule such as a metal oxide or an oxide-based ore is heated and dissolved with a burner flame of a powder heating burner, and further reduced using a reducing gas (for example, oxygen gas). The present invention relates to a smelting reduction method for obtaining a molten metal.
高価な合金鉄の代わりに、金属の酸化物や酸化物系鉱石の粉体または粒体(以下、原料粉粒体という)を炭材(たとえばコークス等)とともに転炉型精錬炉に装入して、炉内で加熱して溶解し、さらに還元して有価金属を含有する金属溶湯を溶製する技術は、溶融還元法と呼ばれている。溶融還元法では、安価な原料(すなわち粒径の小さい粉体または粒体)に含まれる有価金属を溶湯として回収するために、大規模な還元反応を生起させる大量の熱エネルギーを必要とする。 Instead of expensive alloy iron, metal oxide or oxide-based ore powder or granule (hereinafter referred to as raw material granule) is charged into a converter-type smelting furnace together with carbonaceous materials (eg, coke). The technique of melting in a furnace by heating and melting, further reducing and melting a metal melt containing valuable metals is called a smelting reduction method. In the smelting reduction method, in order to recover valuable metals contained in inexpensive raw materials (that is, powders or granules having a small particle diameter) as molten metal, a large amount of heat energy that causes a large-scale reduction reaction is required.
そこで、溶融還元の原料となる原料粉粒体を加熱する粉体加熱バーナーが種々検討されている。
たとえば特許文献1には、粉体加熱バーナーのノズル形状や原料粉粒体の供給速度を規定することによって、粉体加熱バーナーのバーナー火炎から発生する熱量を原料に効率良く伝熱する技術が開示されている。しかしながら、この技術では粉体加熱バーナーに供給される燃料が必ずしも完全燃焼しないので、燃料の燃焼によって生じる熱量を有効に活用する観点から改善の余地が残されていた。
Thus, various powder heating burners for heating the raw material granular material as a raw material for smelting reduction have been studied.
For example, Patent Document 1 discloses a technique for efficiently transferring heat generated from a burner flame of a powder heating burner to a raw material by defining the nozzle shape of the powder heating burner and the supply speed of the raw material granular material. Has been. However, in this technique, since the fuel supplied to the powder heating burner does not necessarily burn completely, there is room for improvement from the viewpoint of effectively utilizing the amount of heat generated by the combustion of the fuel.
粉体加熱バーナーに供給される燃料を完全燃焼させるためには、燃料のみならず酸素の供給量についても適正範囲に維持する必要がある。特に転炉型精錬炉を用いた溶鉄の溶融還元のように、還元のための酸素ガスを上方から炉内の溶鉄に吹き付ける上吹きランスと、加熱のための燃料を酸素で燃焼させる粉体加熱バーナーとを用いる場合には、上吹きランスから吹き付ける酸素ガスが溶鉄中の炭素と反応して生成したCOガスが炉内に多量に存在するので、粉体加熱バーナーに供給した酸素が、燃料と反応せず、炉内のCOガスと反応する。その結果、燃料の燃焼効率が低下し、熱量を十分に発生できないので、原料粉粒体を投入することによって溶鉄の温度が低下する。したがって、原料粉粒体を溶解し、さらに溶鉄の温度を再び昇温して、上吹きランスから吹き付けられる酸素ガスによる還元反応を生起させるまで長時間を要する。 In order to completely burn the fuel supplied to the powder heating burner, it is necessary to maintain not only the fuel but also the supply amount of oxygen within an appropriate range. In particular, as in the case of molten iron smelting reduction using a converter-type refining furnace, an upper blowing lance that blows oxygen gas for reduction onto molten iron in the furnace from above, and powder heating that burns fuel for heating with oxygen When using a burner, the oxygen gas blown from the top blowing lance reacts with the carbon in the molten iron and a large amount of CO gas is generated in the furnace, so the oxygen supplied to the powder heating burner is the fuel and It does not react and reacts with CO gas in the furnace. As a result, the combustion efficiency of the fuel is reduced and the amount of heat cannot be sufficiently generated. Therefore, the temperature of the molten iron is lowered by introducing the raw material granular material. Therefore, it takes a long time to dissolve the raw material granules, raise the temperature of the molten iron again, and cause a reduction reaction by the oxygen gas blown from the top blowing lance.
本発明は、粉体加熱バーナーに供給した燃料を効率良く燃焼させ、そのバーナー火炎内で原料粉粒体を効率良く加熱し、さらに溶解した原料粉粒体を還元して金属溶湯を得る溶融還元方法を提供することを目的とする。 The present invention efficiently burns the fuel supplied to the powder heating burner, efficiently heats the raw material granules within the burner flame, and further reduces the dissolved raw material granules to obtain a molten metal It aims to provide a method.
本発明は、粉体加熱バーナーのバーナー火炎で原料粉粒体を加熱し、さらに溶解した原料粉粒体を還元して金属溶湯を得る溶融還元方法において、粉体加熱バーナーの酸素ガス供給速度G(Nm3/分)と燃料供給速度F(Nm3/分)で算出される酸素燃料比G/Fが下記の(1)式を満足する溶融還元方法である。
1.0≦(G/F)/(G/F)st≦5.0 ・・・(1)
G :粉体加熱バーナーの酸素ガス供給速度(Nm3/分)
F :粉体加熱バーナーの燃料供給速度(Nm3/分)
(G/F)st:燃料が完全燃焼する酸素燃料比の化学量論値
本発明の溶融還元方法においては、粉体加熱バーナーに供給する燃料が気体燃料であることが好ましい。また、金属溶湯が溶鉄であり、転炉型精錬炉内に保持した溶鉄に酸素ガスを上方から吹き付ける上吹きランスと、粉体加熱バーナーとを用いて、溶鉄の加熱および還元を行なうことが好ましい。
The present invention relates to a melting reduction method for heating a raw material granular material with a burner flame of a powder heating burner and further reducing the dissolved raw material granular material to obtain a molten metal. This is a smelting reduction method in which the oxygen fuel ratio G / F calculated by (Nm 3 / min) and the fuel supply speed F (Nm 3 / min) satisfies the following expression (1).
1.0 ≦ (G / F) / (G / F) st ≦ 5.0 (1)
G: Oxygen gas supply rate of powder heating burner (Nm 3 / min)
F: Fuel supply speed of powder heating burner (Nm 3 / min)
(G / F) st : Stoichiometric value of oxygen fuel ratio at which fuel is completely combusted In the smelting reduction method of the present invention, the fuel supplied to the powder heating burner is preferably a gaseous fuel. Further, the molten metal is molten iron, and it is preferable to heat and reduce the molten iron using an upper blowing lance that blows oxygen gas from above onto the molten iron held in the converter-type refining furnace and a powder heating burner. .
本発明によれば、粉体加熱バーナーに供給した燃料を効率良く燃焼させ、溶融還元の原料となる金属の酸化物や酸化物系鉱石の粉体または粒体(すなわち原料粉粒体)をそのバーナー火炎内で効率良く加熱し、さらに金属溶湯の還元を行なうことができる。 According to the present invention, the fuel supplied to the powder heating burner is efficiently combusted, and the metal oxide or oxide-based ore powder or granule (that is, the raw material granule) serving as the raw material for smelting reduction is obtained. Heating can be performed efficiently in the burner flame, and the molten metal can be further reduced.
図1は、本発明の溶融還元方法で使用する粉体加熱バーナーの例を模式的に示す図であり、(a)は断面図、(b)はA−A’方向から見た平面図である。粉体加熱バーナー1には、金属の酸化物や酸化物系鉱石の粉体または粒体(すなわち原料粉粒体)を噴出する粉体ノズル2が中心部に設けられ、その外周部に燃料を噴出する燃料ノズル3および酸素ガスを噴出する酸素ガスノズル4が同心円状に配置される。粉体ノズル2は円形であり、燃料ノズル3および酸素ガスノズル4は円環状の形状をなす。また、粉体加熱バーナー1の溶損を防止するために冷却水が循環供給される冷却水循環路5が設けられる。
FIG. 1 is a diagram schematically showing an example of a powder heating burner used in the smelting reduction method of the present invention, where (a) is a cross-sectional view, and (b) is a plan view seen from the direction AA ′. is there. The powder heating burner 1 is provided with a
このような粉体加熱バーナー1に供給される酸素ガスを助燃剤として燃料が燃焼し、粉体加熱バーナー1の先端に火炎(以下、バーナー火炎という)が発生する。
一方、溶融還元の原料となる原料粉粒体は、粉体ノズル2から噴出してバーナー火炎中を通過する際に加熱される。
バーナー火炎を形成するにあたって、粉体加熱バーナー1に供給される酸素ガスの供給速度G(Nm3/分)と燃料の供給速度F(Nm3/分)を調整して、燃料を完全燃焼させる。つまり、酸素ガス供給速度Gと燃料供給速度Fで算出されるG/F値(いわゆる酸素燃料比)を下記の(1)式を満足する範囲内に維持しながら燃料を燃焼させる。
The fuel burns using oxygen gas supplied to the powder heating burner 1 as a combustion aid, and a flame (hereinafter referred to as a burner flame) is generated at the tip of the powder heating burner 1.
On the other hand, the raw material granular material used as the raw material for smelting reduction is heated when it is ejected from the
In forming the burner flame, the oxygen gas supply rate G (Nm 3 / min) and the fuel supply rate F (Nm 3 / min) supplied to the powder heating burner 1 are adjusted to completely burn the fuel. . That is, the fuel is burned while maintaining the G / F value (so-called oxygen fuel ratio) calculated by the oxygen gas supply rate G and the fuel supply rate F within a range satisfying the following expression (1).
1.0≦(G/F)/(G/F)st≦5.0 ・・・(1)
G :粉体加熱バーナーの酸素ガス供給速度(Nm3/分)
F :粉体加熱バーナーの燃料供給速度(Nm3/分)
(G/F)st:燃料が完全燃焼する酸素燃料比の化学量論値
この(G/F)/(G/F)st値が1.0未満では、燃料が完全燃焼せず、原料粉粒体が十分に加熱されない。一方、(G/F)/(G/F)st値が5.0を超えると、やはり燃料が完全燃焼せず、原料粉粒体が十分に加熱されない。
1.0 ≦ (G / F) / (G / F) st ≦ 5.0 (1)
G: Oxygen gas supply rate of powder heating burner (Nm 3 / min)
F: Fuel supply speed of powder heating burner (Nm 3 / min)
(G / F) st : Stoichiometric value of the oxygen fuel ratio at which the fuel is completely combusted If this (G / F) / (G / F) st value is less than 1.0, the fuel will not be combusted completely, and the raw material granules Is not heated enough. On the other hand, when the (G / F) / (G / F) st value exceeds 5.0, the fuel is not completely combusted, and the raw material powder is not sufficiently heated.
本発明で使用する燃料の種類は、特に限定しないが、気体燃料または液体燃料が好ましい。ただし、液体燃料は燃料ノズル3が目詰まりを起こす惧れがあるので、気体燃料が最も好ましい。気体燃料を使用すれば、燃料ノズル3の目詰まりを防止できるだけでなく、供給速度を容易に調整できる、着火し易いので失火を防止できる等の利点がある。
本発明は、上吹きランスを備えた転炉型精錬炉を用いて溶鉄の溶融還元を行なう際にも有効である。上吹きランスと粉体加熱バーナーを用いる場合は、原料粉粒体が粉体加熱バーナーのバーナー火炎中を通過する際に加熱され、溶鉄に落下する途中で溶解する。あるいは、原料粉粒体がバーナー火炎で溶解しない場合は、溶鉄に落下した後、短時間で溶解する。したがって、原料粉粒体を投入しても溶鉄の温度低下を防止できる。そして、溶解した原料粉粒体(すなわち金属の酸化物や酸化物系鉱石)の還元反応が、上吹きランスから吹き付けられる酸素ガスによって速やかに進行する。
The type of fuel used in the present invention is not particularly limited, but gaseous fuel or liquid fuel is preferable. However, liquid fuel is most preferable because gaseous fuel may cause clogging of the
The present invention is also effective when molten iron is melted and reduced using a converter-type refining furnace equipped with an upper blowing lance. In the case of using an upper blowing lance and a powder heating burner, the raw material granular material is heated when passing through the burner flame of the powder heating burner, and melts in the middle of dropping into the molten iron. Or when a raw material granular material does not melt | dissolve with a burner flame, after falling to molten iron, it melt | dissolves in a short time. Therefore, even if raw material granular material is thrown in, the temperature fall of molten iron can be prevented. And the reduction reaction of the melted raw material particles (that is, metal oxide or oxide-based ore) proceeds promptly by the oxygen gas blown from the top blowing lance.
既に説明した通り、従来は、上吹きランスから吹き付ける酸素ガスが溶鉄中の炭素と反応して生成したCOガスが炉内に多量に存在するので、粉体加熱バーナー1に供給した酸素が、燃料と反応せず、炉内のCOガスと反応してしまい、熱量を十分に発生できないという問題があった。
これに対して本発明では、炉内にCOガスが存在しても、粉体加熱バーナー1に供給した酸素が燃料を完全燃焼させるので十分な熱量を得ることができる。その結果、原料粉粒体を効率良く加熱することが可能となり、溶融還元の能率向上に寄与する。
As described above, conventionally, there is a large amount of CO gas generated by the reaction of the oxygen gas blown from the top blowing lance with the carbon in the molten iron in the furnace, so the oxygen supplied to the powder heating burner 1 is the fuel. There is a problem that it does not react with the CO gas in the furnace and cannot generate a sufficient amount of heat.
In contrast, in the present invention, even if CO gas is present in the furnace, the oxygen supplied to the powder heating burner 1 completely burns the fuel, so that a sufficient amount of heat can be obtained. As a result, it is possible to efficiently heat the raw material granular material, which contributes to improving the efficiency of smelting reduction.
図2に模式的に示すようにして、容量5tonの上底吹き転炉を用いてクロム鉱石の溶融還元を行なった。溶銑7を上底吹き転炉6に装入し、粉体加熱バーナー1と上吹きランス15を炉口から挿入した。使用した粉体加熱バーナー1は図1に示す通りである。溶銑7の重量は4ton,上吹きランス15に供給する酸素ガス(以下、上吹き酸素ガスという)の供給速度は15Nm3/分,底吹き羽口9に供給する酸素ガス(以下、底吹き酸素ガスという)の供給速度は5Nm3/分として溶銑7を加熱した。
As schematically shown in FIG. 2, chrome ore was subjected to smelting reduction using an upper-bottom blowing converter having a capacity of 5 tons. The
溶銑7の温度が1600℃に昇温したときに鉱石配管13を介して粉体加熱バーナー1にクロム鉱石粉11を供給するとともに、酸素ガス配管12と燃料配管14を介してそれぞれ酸素ガスと燃料を供給した。なお、燃料はプロパンガス10を使用した。
このようにして溶融還元を開始した後は、燃料(すなわちプロパンガス)の供給速度は1.0Nm3/分,底吹き酸素ガスの供給速度は5Nm3/分とし、上吹きランス15に供給する酸素ガス(すなわち上吹き酸素ガス)と粉体加熱バーナー1に供給する酸素ガスの供給速度は合計20Nm3/分となるように種々変化させた。それらの供給速度は表1に示す通りである。
When the temperature of the
After starting the smelting reduction this way, the fuel (i.e., propane gas) feed rate of 1.0 Nm 3 / min, feed rate of bottom-blown oxygen gas to 5 Nm 3 / min, the top-blown oxygen is supplied to the
そして、溶融還元を行ないながら溶銑7の温度を適宜測定し、溶銑7を1600℃に保持するようにクロム鉱石粉11の供給速度を調整した。溶融還元を開始して60分経過した後、粉体加熱バーナー1を引き上げるとともに、酸素ガス,プロパンガス,クロム鉱石粉の供給を停止した。
さらにその後、上吹き酸素ガス16の供給のみを行なう吹錬を3分間行なった。
Then, the temperature of the
Further, after that, blowing for supplying only the top-blown
以上のような手順で行なった溶融還元における(G/F)/(G/F)st値は表1に示す通りである。ここにプロパンガスの完全燃焼反応の反応式はC3H8+5O2→3CO2+4H2Oであるので、この場合の(G/F)st=5/1=5である。表1中の発明例は(G/F)/(G/F)st値が(1)式の範囲を満足する例であり、比較例は(1)式の範囲を外れる例である。 Table 1 shows the (G / F) / (G / F) st value in the smelting reduction performed by the procedure as described above. Here, since the reaction formula for the complete combustion reaction of propane gas is C 3 H 8 + 5O 2 → 3CO 2 + 4H 2 O, (G / F) st = 5/1 = 5 in this case. The invention examples in Table 1 are examples where the (G / F) / (G / F) st value satisfies the range of the formula (1), and the comparative example is an example out of the range of the formula (1).
また、バーナー火炎の燃焼熱の着熱効率を表1に併せて示す。着熱効率は、バーナー火炎の燃焼熱量のうち、クロム鉱石の加熱に寄与する熱量の比率を示す指標であり、着熱効率が高いほど、クロム鉱石が効率良く加熱されることを表わす。なお表1では、(G/F)/(G/F)st=1.0の溶融還元における着熱効率を1.00とする指数(以下、着熱効率指数という)で示す。図3は、表1中の(G/F)/(G/F)st値と着熱効率指数との関係を示すグラフである。 In addition, Table 1 also shows the heat receiving efficiency of the combustion heat of the burner flame. The heat receiving efficiency is an index indicating the ratio of the amount of heat that contributes to the heating of the chrome ore in the combustion heat amount of the burner flame. The higher the heat receiving efficiency, the more efficiently the chrome ore is heated. In Table 1, it is indicated by an index (hereinafter referred to as a heat absorption efficiency index) in which the heat absorption efficiency in smelting reduction with (G / F) / (G / F) st = 1.0 is 1.00. FIG. 3 is a graph showing the relationship between the (G / F) / (G / F) st value in Table 1 and the thermal efficiency index.
表1および図3から明らかなように、(G/F)/(G/F)st値が(1)式の範囲を満足する例(すなわち発明例)では着熱効率指数が1.00〜1.25であったのに対して、(G/F)/(G/F)st値が(1)式の範囲を外れる例(すなわち比較例)では0.80〜0.90であった。つまり、発明例ではバーナー火炎がクロム鉱石を効率良く加熱していることが分かった。 As is clear from Table 1 and FIG. 3, in the example where the (G / F) / (G / F) st value satisfies the range of the expression (1) (that is, the invention example), the heat absorption efficiency index is 1.00 to 1.25. On the other hand, in the example where the (G / F) / (G / F) st value was out of the range of the expression (1) (that is, the comparative example), it was 0.80 to 0.90. That is, it turned out that the burner flame is heating the chromium ore efficiently in the invention example.
したがって本発明によれば、原料粉粒体を炉内に装入する際に、バーナー火炎が効率良く加熱するので、粉体あるいは粒体の安価な原料を大量に使用して溶融還元を行なうことが可能である。 Therefore, according to the present invention, when the raw material granular material is charged into the furnace, the burner flame efficiently heats up, so that a large amount of inexpensive raw material of powder or granular material is used for smelting reduction. Is possible.
粉体加熱バーナーに供給した燃料を効率良く燃焼させ、溶融還元の原料となる金属の酸化物や酸化物系鉱石の粉体または粒体(すなわち原料粉粒体)をそのバーナー火炎内で効率良く加熱し、さらに金属溶湯の還元を行なうことができ、産業上格段の効果を奏する。 The fuel supplied to the powder heating burner is efficiently combusted, and the metal oxide or oxide-based ore powder or granule (ie, raw material granule) that is the raw material for smelting reduction is efficiently produced in the burner flame. Heating and further reduction of the molten metal can be carried out, and there is a remarkable industrial effect.
1 粉体加熱バーナー
2 粉体ノズル
3 燃料ノズル
4 酸素ガスノズル
5 冷却水循環路
6 上底吹き転炉
7 溶銑
8 スラグ
9 底吹き羽口
10 プロパンガス
11 クロム鉱石粉
12 酸素ガス配管
13 鉱石配管
14 燃料配管
15 上吹きランス
16 上吹き酸素ガス
DESCRIPTION OF SYMBOLS 1
10 Propane gas
11 Chromium ore powder
12 Oxygen gas piping
13 Ore piping
14 Fuel piping
15 Top blow lance
16 Top blowing oxygen gas
Claims (3)
1.0≦(G/F)/(G/F)st≦5.0 ・・・(1)
G :粉体加熱バーナーの酸素ガス供給速度(Nm3/分)
F :粉体加熱バーナーの燃料供給速度(Nm3/分)
(G/F)st:燃料が完全燃焼する酸素燃料比の化学量論値 In the melt reduction method in which the raw material granular material is heated with a burner flame of a powder heating burner, and the molten raw material granular material is reduced to obtain a molten metal, the oxygen gas supply rate G (Nm) of the powder heating burner 3 / min) and an oxygen fuel ratio G / F calculated by a fuel supply rate F (Nm 3 / min) satisfy the following formula (1).
1.0 ≦ (G / F) / (G / F) st ≦ 5.0 (1)
G: Oxygen gas supply rate of powder heating burner (Nm 3 / min)
F: Fuel supply speed of powder heating burner (Nm 3 / min)
(G / F) st : Stoichiometric value of the ratio of oxygen fuel to complete combustion of the fuel
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Cited By (4)
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JP2013209738A (en) * | 2011-04-27 | 2013-10-10 | Jfe Steel Corp | Method of manufacturing molten steel |
JP2013209737A (en) * | 2011-04-27 | 2013-10-10 | Jfe Steel Corp | Method for producing molten steel |
JP2014084520A (en) * | 2012-10-26 | 2014-05-12 | Jfe Steel Corp | Method for refining molten iron in converter |
CN114562878A (en) * | 2022-02-28 | 2022-05-31 | 洛南环亚源铜业有限公司 | Automatic metal smelting equipment and smelting process thereof |
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JP2003172584A (en) * | 2001-09-28 | 2003-06-20 | Nippon Sanso Corp | Fine particle blowing device and refining method |
JP2007138207A (en) * | 2005-11-16 | 2007-06-07 | Jfe Steel Kk | Smelting-reduction process |
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JPS60208409A (en) * | 1984-04-03 | 1985-10-21 | Kawasaki Steel Corp | Manufacture of molten metal by melt reduction |
JP2003172584A (en) * | 2001-09-28 | 2003-06-20 | Nippon Sanso Corp | Fine particle blowing device and refining method |
JP2007138207A (en) * | 2005-11-16 | 2007-06-07 | Jfe Steel Kk | Smelting-reduction process |
JP2008179876A (en) * | 2006-03-23 | 2008-08-07 | Jfe Steel Kk | Powder heating burner lance and smelting reduction method using it |
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Publication number | Priority date | Publication date | Assignee | Title |
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JP2013209738A (en) * | 2011-04-27 | 2013-10-10 | Jfe Steel Corp | Method of manufacturing molten steel |
JP2013209737A (en) * | 2011-04-27 | 2013-10-10 | Jfe Steel Corp | Method for producing molten steel |
JP2014084520A (en) * | 2012-10-26 | 2014-05-12 | Jfe Steel Corp | Method for refining molten iron in converter |
CN114562878A (en) * | 2022-02-28 | 2022-05-31 | 洛南环亚源铜业有限公司 | Automatic metal smelting equipment and smelting process thereof |
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