CN1071795C - 用固体碳化铁炼铁的方法 - Google Patents
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B11/00—Making pig-iron other than in blast furnaces
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/56—Manufacture of steel by other methods
- C21C5/567—Manufacture of steel by other methods operating in a continuous way
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- 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
-
- 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
- C21B13/0026—Making spongy iron or liquid steel, by direct processes obtaining iron or steel in a molten state introduction of iron oxide in the flame of a burner or a hot gas stream
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/56—Manufacture of steel by other methods
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- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
- Vertical, Hearth, Or Arc Furnaces (AREA)
- Manufacture Of Iron (AREA)
Abstract
公开了一种以碳化铁为原料的炼铁方法。将固体碳化铁喷入到由铁水和炉渣构成的熔池中,并使碳化铁在熔池中溶解。将含氧气体喷入到熔池表面上方的气体空间中,从而导致该气体空间中至少一部分可燃物质燃烧。此外,铁水和炉渣喷溅物或液滴而向上喷溅而进入熔池表面上方的气体空间中,从而形成一个过渡区。在这个过渡区中,可燃物质燃烧产生的热量被传递给铁水和炉渣的喷溅物或液滴,进而在这些铁水和炉渣的喷溅物或液滴在回落到熔池中时将热量传递给熔池。
Description
本发明涉及一种在装有铁水熔池的冶金炉中用碳化铁为原料的炼铁方法。
在现有技术的炼铁工业中,一般是以铁的氧化物为原料来炼铁,例如WO 96/31627提出一种将氧化铁转变成铁的方法。WO 96/19591则提出一种将碳化铁转变成钢的方法。这些方法在热量的利用率方面不够理想。
本发明的目的是提出一种炼铁的方法,其以碳化铁喷入熔池中,与氧反应产生一氧化碳,一氧化碳在熔池上方与氧反应,反应热量由喷溅物带回熔池,从而充分利用热量。
为了实现上述目的,本发明提供一种由碳化铁制造具有至少2wt%的碳重量百分比浓度的熔铁的方法,包括以下步骤:
(ⅰ)将固体碳化铁喷入到由铁水和炉渣构成的熔池中,并使碳化铁在熔池中溶解;
(ⅱ)将含氧气体喷入到熔池表面上方的气体空间中,从而导致该气体空间中至少一部分可燃物质燃烧;
(ⅲ)将含氧气体喷入熔池中,以提供氧,用于与熔池中溶解的碳反应,形成一氧化碳,一氧化碳从熔池中释放出来进入气体空间中;以及
(ⅳ)铁水和/或炉渣喷溅物和/或液滴从熔池向上喷溅而进入熔池表面上方的气体空间中,从而形成一个过渡区,在这个过渡区中,可燃物质燃烧产生的热量传递给铁水和/或炉渣的喷溅物和/或液滴,进而在这些铁水和/或炉渣的喷溅物和/或液滴在回落到熔池中时将热量传递给熔池。
这里“可燃物质”可以理解为任一固体物质、液体物质、气体物质。
例如,它包括从熔池中产生并释放出来的一氧化碳和氢气。
碳化铁可以以任何适宜的形态从任一供应商处购买。
一般,少部分碳化铁含有铁矿石或氧化亚铁,结果,碳化铁溶解在步骤(ⅰ)熔池中时将氧带入到熔池中,而氧与溶解的碳结合形成一氧化碳,并从熔池中释放到气体空间中。
在一实施例中,其方法包括将含氧气体喷入熔池中以提供与熔池中溶解碳进行反应所需的氧,从而形成一氧化碳,并从熔池中释放出来进入气体空间。
上述方法的步骤(ⅰ)还包括将碳加入到熔池中,这有两个目的:
(ⅰ)保持熔池的还原气氛环境,从而防止熔池中铁的氧化;
(ⅱ)为产生热量而提供可燃物质以保持熔池温度足以溶解喷入熔池中的碳化铁。
就上面第(ⅱ)部分而言,如上所述在熔池中含有氧——这里的氧可以是作为加入碳化铁的一部分而加入的或在第(ⅱ)步骤作为含氧气体的一部分而喷入的。从而使氧与溶解在熔池中的一部分碳发生反应,并以一氧化碳的形式而被释放进入熔池表面上方的气体空间中。
一氧化碳是一种可燃物质,它与气体空间中的含氧气体反应形成二氧化碳,并由于这一反应的结果而产生热量,且产生的热量通过过渡区而传递到熔池中。
另外,由于鲍氏反应,一部分溶解碳与二氧化碳发生反应,从而重新形成一氧化碳,而成为产生可燃物质的又一供应来源。
在类似的反应中,一部分溶解碳与水蒸汽反应而生成一氧化碳,也可成为产生可燃物质的供应来源。
溶解碳和二氧化碳的反应也可以在过渡区发生,即:
(ⅰ)溶解碳随着铁水的喷溅物和/或液滴而从熔池被带进过渡区内;
(ⅱ)气体空间中的二氧化碳随着喷入到熔池上方的气体空间中的含氧气体而被带进过渡区中。
最好喷入到气体空间中或喷入到熔池中的含氧气体是空气。
最好该空气是经过预热的。
最好该空气被预热到550℃以上。
最好该方法还包括将含碳物质喷入到熔池中,并且将含碳物质溶解在熔池中。
这里“含碳物质”可以理解为任何适宜的含碳源,可以是固体形式或是气态形式。
例如,含碳物质可以是煤。
一般,煤含有挥发物,如作为可燃物质的碳氢化合物。
就从碳化铁的溶解而分离出来的碳而言,含碳物质具有两个作用:
(ⅰ)保持熔池的还原气氛环境,从而防止熔池中铁氧化;
(ⅱ)为产生热量而提供可燃物质以保持熔池温度足以溶解喷入熔池中的碳化铁。
最好将熔池温度保持在1350℃以上。
特别是最好将熔池温度保持在1450℃以上。
在一实施例中,最好过渡区是通过与熔池相联的炉壳侧面或熔池上方伸入的鼓风口将载气和碳化铁和/或固体含碳物质和/或其他固体物质喷入熔池中,从而载气和固体物质使熔池中的铁水和炉渣向上喷溅而形成的。
特别是,最好该方法还包括控制载气和固体物质喷入的量,从而使铁水和炉渣象喷泉一样喷入熔池表面上方的空间中。
在另一实施例中,最好过渡区是由载气从底部喷射而形成的。
在该实施例中,最好过渡区是通过将载气、碳化铁、含碳物质或其他固体物质从底部喷射到熔池中,从而使铁水和炉渣从熔池中向上喷出而形成的。
通过参照附图对本发明做进一步的说明,该附图为本发明优选实施例炼铁设备的剖面示意图。
图中所示的设备包括:用于容纳铁水和炉渣的熔池9的冶金炉3,冶金炉3带金属炉壳5和耐火材料炉衬7。
炉子3带有炉底11、侧壁13、炉盖15和气体出口17。
该设备还包括一喷嘴21,喷嘴21通过侧壁13而向下插入到炉子3中的一定位置,即使用时,喷嘴21的开口端距离熔池9中铁水静止液面上方较近的位置。
该设备通常还包括一个通过炉盖15而垂直向下插入炉子3中的喷嘴25。
根据本发明的优选实施例,由适宜的载气(如氮气)而携带的碳化铁和煤,通过侧喷嘴21而喷入到铁水和炉渣的熔池9中。
碳化铁和煤溶解在熔池9中。熔池中的铁水定期或连续地从炉子3中排出。这里要注意的是典型的铁水含碳量为2-5%(重量)。
根据本发明的优选实施例,通过拥有足够压头的侧喷嘴21喷吹碳化铁和煤,以使铁水和炉渣的喷溅物和液滴象喷泉一样从熔池9向上喷出,在熔池表面上方的气体空间29内形成过渡区27。
此外,根据本发明的优选实施例,通过顶部喷嘴25将适宜的含氧气体(如热空气或富氧空气)喷向气体空间29中的过渡区27。在气体空间29中,含氧气体将可燃物质(如一氧化碳、氢气)燃烧,同时含氧气体的最初压头将燃烧所产生的反应物和热量传递到过渡区27中。
过渡区27的一个重要作用就是提供一个将在气体空间29中燃烧产生的热量传递到熔池9中,以保持熔池温度至少达到1350℃,最好为1450℃以上的环境。而这是通过将在气体空间29中燃烧可燃物质产生的热量传递给位于过渡区27中的铁水和炉渣的液滴和喷溅物,从而在铁水和炉渣的液滴和喷溅物回落到熔池9时将热量传递给熔池9实现的。
由碳化铁和煤的溶解而形成的碳有两个作用,一个是保持熔池9的强还原气氛环境,以防止熔池9中铁的氧化,另一个是提供热源以保持熔池9处于熔融状态。即:
(ⅰ)如上所述,在气体空间29中CO/H2燃烧成CO2/H2O;
(ⅱ)CO2变为CO而产生可燃物质。
本发明方法的优选实施例还包括将适宜的造渣添加剂喷入到熔池9中。
上述方法对于用碳化铁来炼铁是一个明显有效的措施。
在不违背本发明精神和范围的情况下,可以对与图示有关的所述方法的优选实施例做许多改进。
在附后的权利要求和前面本发明的说明中,“含有”(即Comprising和Comprises)一词都是采用“包括”(即Including)这一词意,即与该词相关的特征可能还包含没有表达出来的其他特征。
Claims (9)
1.一种由碳化铁制造具有至少2wt%的碳重量百分比浓度的熔铁的方法,包括以下步骤:
(ⅰ)将固体碳化铁喷入到由铁水和炉渣构成的熔池中,并使碳化铁在熔池中溶解;
(ⅱ)将含氧气体喷入到熔池表面上方的气体空间中,从而导致该气体空间中至少一部分可燃物质燃烧;
(ⅲ)将含氧气体喷入熔池中,以提供氧,用于与熔池中溶解的碳反应,形成一氧化碳,一氧化碳从熔池中释放出来进入气体空间中;以及
(ⅳ)铁水和/或炉渣喷溅物和/或液滴从熔池向上喷溅而进入熔池表面上方的气体空间中,从而形成一个过渡区,在这个过渡区中,可燃物质燃烧产生的热量传递给铁水和/或炉渣的喷溅物和/或液滴,进而在这些铁水和/或炉渣的喷溅物和/或液滴在回落到熔池中时将热量传递给熔池。
2.如权利要求1所述的方法,其中喷入到气体空间中和/或喷入到熔池中的含氧气体是空气。
3.如权利要求2中所述的方法,包括空气被预热到550℃以上。
4.如上述权利要求的任何一项所述的方法,包括将含碳物质喷入到熔池中,并且将含碳物质溶解在熔池中。
5.如权利要求4所述的方法,其中含碳物质是煤。
6.如上述权利要求的任何一项所述的方法,包括通过与熔池相联的炉壳侧面和/或熔池上方伸入的鼓风口将载气和碳化铁和/或固体含碳物质和/或其他固体物质喷入熔池中,从而载气和固体物质导致熔池中的铁水和/或炉渣向上喷溅到熔池表面之上的气体空间而形成的过渡区。
7.如权利要求6所述的方法,包括控制载气和固体物质喷入的量,从而使铁水和炉渣象喷泉一样喷入熔池表面上方的空间中而形成的过渡区。
8.如权利要求1至5任何一项所述的方法,包括通过从底部喷射载气而形成的过渡区。
9.如权利要求1至5任何一项所述的方法,包括通过将载气、碳化铁和/或含碳物质和/或其他固体物质从底部喷射到熔池中,从而使铁水和炉渣从熔池中向上喷出到气体空间而形成的过渡区。
Applications Claiming Priority (2)
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AUPO4263A AUPO426396A0 (en) | 1996-12-18 | 1996-12-18 | A method of producing iron |
AUPO4263 | 1996-12-18 |
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CN1246159A CN1246159A (zh) | 2000-03-01 |
CN1071795C true CN1071795C (zh) | 2001-09-26 |
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CN97181851A Expired - Fee Related CN1071795C (zh) | 1996-12-18 | 1997-12-17 | 用固体碳化铁炼铁的方法 |
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US (1) | US6328783B1 (zh) |
EP (1) | EP0946756A4 (zh) |
JP (1) | JP2001506316A (zh) |
KR (1) | KR20000069572A (zh) |
CN (1) | CN1071795C (zh) |
AU (1) | AUPO426396A0 (zh) |
WO (1) | WO1998027232A1 (zh) |
ZA (1) | ZA9711351B (zh) |
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- 1997-12-17 CN CN97181851A patent/CN1071795C/zh not_active Expired - Fee Related
- 1997-12-17 JP JP52711698A patent/JP2001506316A/ja active Pending
- 1997-12-17 US US09/331,272 patent/US6328783B1/en not_active Expired - Fee Related
- 1997-12-17 KR KR1019997005526A patent/KR20000069572A/ko not_active Application Discontinuation
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Also Published As
Publication number | Publication date |
---|---|
KR20000069572A (ko) | 2000-11-25 |
WO1998027232A1 (en) | 1998-06-25 |
CN1246159A (zh) | 2000-03-01 |
ZA9711351B (en) | 1998-06-23 |
EP0946756A4 (en) | 2003-06-04 |
EP0946756A1 (en) | 1999-10-06 |
JP2001506316A (ja) | 2001-05-15 |
AUPO426396A0 (en) | 1997-01-23 |
US6328783B1 (en) | 2001-12-11 |
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