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1. 发明公开

EP0355163A1 PROCESS FOR PRODUCING MOLTEN STAINLESS STEEL 失效
标题翻译： VERFAHREN ZUR HERSTELLUNG VON GESCHMOLZENEM ROSTFREIEM STAHL。
公开(公告)号：EP0355163A1
公开(公告)日：1990-02-28
申请号：EP88907783.0
申请日：1988-09-09
申请人： NKK CORPORATION
发明人： TANABE, Haruyoshi NKK Corporation-nai , KAWAKAMI, Masahiro NKK Corporation-nai , TAKAHASHI, Kenji NKK Corporation-nai , IWASAKI, Katsuhiro NKK Corporation-nai , INOUE, Shigeru NKK Corporation-nai
IPC分类号： C21B13/00
CPC分类号： C21C5/005 , C21B13/0006 , C21C5/35 , C21C7/0685 , Y02P10/136
摘要： A process for producing molten stainless steel by continuously subjecting Cr materials such as Cr ores or Cr pellets to melt reduction and decarbonization in one vessel at high treating speeds, which comprises, in the melt reduction, blowing an inert gas or the like through a bottom-blown tuyere to form projections on the molten metal surface and blowing an inert gas or the like against the projections through a side-blown tuyere to diffuse the molten metal into a Cr material-floating zone in the slag for accelerating the reduction of the Cr material with C contained in the molten metal and, on the other hand, blowing O₂ for decarbonization into the molten metal through a top-blown lance and O₂ for secondary combustion into the slag to form a secondary combustion zone mainly in the slag, and vigorously stirring the slag by the side-blown gas to give a heat produced by the secondary combustion to the Cr ores with high efficiency while keeping a second combustion ratio at 0.3 or more for assuring high secondary combustion and, after the melt reduction, discharging the slag and top-blowing O₂ for decarbonization diluted with an inert gas and blowing an inert gas through the bottom-blown tuyere to vigorously stir the molten metal.
SUMMARY OF THE INVENTION
This invention relates to a method of producing stainless molten steel by a smelting reduction treatment - decarburization treatment of Cr raw materials such as Cr ores, Cr ore pellets and so on consecutively and at high treating speed in one container. In the smelting reduction, an inert gas is blown from bottom tuyeres to form an upheaving part of the molten metal on its surface and the inert gas is blown to this upheaving part. The molten metal is thereby caused to disperse into a region of the slag where the Cr materials float, so that the reduction of Cr is accelerated by C. On the other hand, decarburizing O₂ is blown into the molten metal from a top lance, while O₂ for a post combustion is blown into the slag, so that a post combustion region is formed mainly in the slag, and the slag is forcibly agitated by blowing the gas from the side tuyere, so that a heat generated by the post combustion is caused to transfer to Cr ores at high heat transfer efficiency, and a high post combustion is secured, as maintaining the post combustion ratio to be more than 0.3. After having completed the smelting reduction, the slag is discharged. The molten metal is agitated complusively by blowing the decarburizing O₂ diluted with the inert gas from the top lance, and blowing the inert gas from the bottom tuyeres.
摘要翻译：通过连续地使Cr材料如Cr矿石或Cr颗粒物质以高处理速度在一个容器中进行熔融还原和脱碳来生产熔融不锈钢的方法，其包括在熔融还原中通过底部吹入惰性气体等在熔融金属表面上形成凸起并通过侧吹风口将惰性气体等喷射到突起上，以将熔融金属扩散到炉渣中的Cr材料浮起区域中，以加速Cr的还原在熔融金属中含有C的材料，另一方面，通过顶吹喷枪向熔融金属中吹入O2，将二次燃烧的O2吹入炉渣中，主要在炉渣中形成二次燃烧区，并大力地通过侧吹气体搅拌炉渣，以高效率向二次燃烧产生的热量，同时将第二燃烧比保持在0.3以上确保高二次燃烧，并且在熔融还原之后，用惰性气体稀释炉渣和顶吹的用于脱碳的O2，并通过底吹风口吹入惰性气体以剧烈搅拌熔融金属。

2. 发明公开

EP0331751A1 PROCESS FOR DECARBURIZING HIGH-Cr MOLTEN PIG IRON 有权转让
标题翻译： VERFAHREN ZUM ENTKOHLEN VON HOCHCHROMHALTIGEM ROHEISEN。
公开(公告)号：EP0331751A1
公开(公告)日：1989-09-13
申请号：EP88907784.8
申请日：1988-09-09
申请人： NKK CORPORATION
发明人： TANABE, Haruyoshi NKK Corporation-nai , KAWAKAMI, Masahiro NKK Corporation-nai , TAKAHASHI, Kenji NKK Corporation-nai , IWASAKI, Katsuhiro NKK Corporation-nai , INOUE, Shigeru NKK Corporation-nai
IPC分类号： C21C5/28 , C21C5/30 , C21B11/00 , C21B13/00
CPC分类号： C21B13/0006 , C21C5/005 , C21C5/35 , C21C7/0685 , Y02P10/136
摘要： A process for decarburizing high-Cr molten pig iron under atmospheric pressure in a short time with minimized Cr loss due to oxidation is disclosed. A fundamental feature of the process comprises top-blowing decarburizing O₂ diluted with an inert gas through a top-blowing lance against high-Cr molten pig iron in a vessel and at the same time blowing an inert gas through a bottom-blowing tuyere to vigorously stir the molten pig iron. Another feature of the process comprises controlling a slag amount in the above-described decarburizing blowing to thereby depress Cr loss due to oxidation. A further feature comprises conducting a predetermined denitrification after the blowing to thereby economically produce low-nitrogen molten iron with depressed Cr loss due to oxidation.
ABSTRACT
The present invention relates to a method which may decarburize high Cr molten metal for a short period of time under an atmospheric pressure, while checking loss of Cr by its oxidation. A basic feature of the invention is to blow from the furnace top lance a decarburizing O₂ diluted by an inert gas into the high Cr molten metal supported in a container as well as blow the inert gas from bottom tuyeres so as to forcibly agitate the molten metal. Another feature of the invention is to control a slag amount during the above decarburizion blowing so as to check the Cr oxidation loss. A further object of the invention is to carry out a denitrification in the above decarburization, thereby to produce low N molten metal while checking the loss by Cr oxidation.
摘要翻译：熔融不锈钢是mfd。通过连续地使Cr材料如Cr矿石或Cr颗粒在高处理速度下在一个容器中熔融还原和脱碳。方法包括熔融红。通过底吹风口吹入惰性气体，在熔融金属表面上形成凸起，并通过侧吹风口将惰性气体吹向凸起，以将熔融金属扩散到炉渣中的Cr材料浮起区域，以加速用熔融金属中所含的C还原Cr材料。或者，通过顶吹喷枪将O2吹入熔融金属中，将二氧化二氧化二氧化成炉渣，主要在炉渣中形成二次燃烧区，并通过侧吹气体剧烈搅拌炉渣，二次燃烧高效率地燃烧到Cr矿石上，同时将第二燃烧比保持在0.3以上，以确保高二次燃烧。在熔体还原之后，排出炉渣和用惰性气体稀释的用于脱碳的顶吹O2，并通过底吹风口吹入惰性气体，剧烈搅拌熔融金属。

3. 发明授权

EP0355163B1 PROCESS FOR PRODUCING MOLTEN STAINLESS STEEL 失效
标题翻译：用于生产不锈钢钢水。
公开(公告)号：EP0355163B1
公开(公告)日：1994-06-22
申请号：EP88907783.0
申请日：1988-09-09
申请人： NKK CORPORATION
发明人： TANABE, Haruyoshi NKK Corporation-nai , KAWAKAMI, Masahiro NKK Corporation-nai , TAKAHASHI, Kenji NKK Corporation-nai , IWASAKI, Katsuhiro NKK Corporation-nai , INOUE, Shigeru NKK Corporation-nai
IPC分类号： C21B13/00
CPC分类号： C21C5/005 , C21B13/0006 , C21C5/35 , C21C7/0685 , Y02P10/136
摘要： A process for producing molten stainless steel by continuously subjecting Cr materials such as Cr ores or Cr pellets to melt reduction and decarbonization in one vessel at high treating speeds, which comprises, in the melt reduction, blowing an inert gas or the like through a bottom-blown tuyere to form projections on the molten metal surface and blowing an inert gas or the like against the projections through a side-blown tuyere to diffuse the molten metal into a Cr material-floating zone in the slag for accelerating the reduction of the Cr material with C contained in the molten metal and, on the other hand, blowing O2 for decarbonization into the molten metal through a top-blown lance and O2 for secondary combustion into the slag to form a secondary combustion zone mainly in the slag, and vigorously stirring the slag by the side-blown gas to give a heat produced by the secondary combustion to the Cr ores with high efficiency while keeping a second combustion ratio at 0.3 or more for assuring high secondary combustion and, after the melt reduction, discharching the slag and top-blowing O2 for decarbonization diluted with an inert gas and blowing an inert gas through the bottom-blown tuyere to vigorously stir the molten metal.

4. 发明公开

EP0436718A1 METHOD OF CHARGING ORE IN MELT-REDUCTION 失效
标题翻译：方法熔制ERZCHARGIEREN减少。
公开(公告)号：EP0436718A1
公开(公告)日：1991-07-17
申请号：EP88907777.2
申请日：1988-09-09
申请人： NKK CORPORATION
发明人： TANABE, Haruyoshi NKK Corporation-nai , KAWAKAMI, Masahiro NKK Corporation-nai , TAKAHASHI, Kenji NKK Corporation-nai , IWASAKI, Katsuhiro NKK Corporation-nai , INOUE, Shigeru NKK Corporation-nai , KAWATA, Hitoshi NKK Corporation-nai
IPC分类号： C21B11/00 , C21B13/00 , C22B5/10
CPC分类号： C21B13/0006 , C21C5/005 , C21C5/35 , C22B5/10 , C22B34/32 , F27B3/085 , F27D3/0025 , F27D3/10 , F27D3/16 , F27D99/0075 , F27M2001/16
摘要： This invention relates to a method of preventing, during the melt-reduction of Cr ore or iron ore, the scatter loss of the ore and coal at the time of charging. In the present invention, the ore and coal are charged down into a furnace from a shoot extended near a furnace port or connected to a furnace body. The ore and coal are charged down into the furnace while a gas is jetted outward of the shoot form nozzles disposed in the circumferential direction inside and near the tip of the shoot so that the raw materials can be charged more effectively while reducing the scatter loss.

5. 发明授权

EP0436718B1 METHOD OF CHARGING ORE IN MELT-REDUCTION 失效
标题翻译： VERFAHREN ZUM ERZCHARGIEREN BEI DER SCHMELZREDUKTION。
公开(公告)号：EP0436718B1
公开(公告)日：1994-07-06
申请号：EP88907777.2
申请日：1988-09-09
申请人： NKK CORPORATION
发明人： TANABE, Haruyoshi NKK Corporation-nai , KAWAKAMI, Masahiro NKK Corporation-nai , TAKAHASHI, Kenji NKK Corporation-nai , IWASAKI, Katsuhiro NKK Corporation-nai , INOUE, Shigeru NKK Corporation-nai , KAWATA, Hitoshi NKK Corporation-nai
IPC分类号： C21B11/00 , C21B13/00 , C22B5/10
CPC分类号： C21B13/0006 , C21C5/005 , C21C5/35 , C22B5/10 , C22B34/32 , F27B3/085 , F27D3/0025 , F27D3/10 , F27D3/16 , F27D99/0075 , F27M2001/16
摘要： This invention relates to a method of preventing, during the melt-reduction of Cr ore or iron ore, the scatter loss of the ore and coal at the time of charging. In the present invention, the ore and coal are charged down into a furnace from a shoot extended near a furnace port or connected to a furnace body. The ore and coal are charged down into the furnace while a gas is jetted outward of the shoot form nozzles disposed in the circumferential direction inside and near the tip of the shoot so that the raw materials can be charged more effectively while reducing the scatter loss.
摘要翻译：本发明涉及在Cr矿石或铁矿石熔融还原过程中防止矿石和煤在充电时的分散损失的方法。在本发明中，将矿石和煤从炉口附近延伸的炉口装入炉中或连接到炉体。矿石和煤被放入炉中，同时在喷嘴的尖端附近沿圆周方向喷射的喷嘴喷嘴向外喷射气体，从而可以更有效地充填原料，同时减少散射损失。

6. 发明授权

EP0331751B1 PROCESS FOR DECARBURIZING HIGH-Cr MOLTEN PIG IRON 有权转让
标题翻译：法脱碳高铬铁。
公开(公告)号：EP0331751B1
公开(公告)日：1994-03-16
申请号：EP88907784.8
申请日：1988-09-09
申请人： NKK CORPORATION
发明人： TANABE, Haruyoshi NKK Corporation-nai , KAWAKAMI, Masahiro NKK Corporation-nai , TAKAHASHI, Kenji NKK Corporation-nai , IWASAKI, Katsuhiro NKK Corporation-nai , INOUE, Shigeru NKK Corporation-nai
IPC分类号： C21C5/28 , C21C5/30 , C21B11/00 , C21B13/00
CPC分类号： C21B13/0006 , C21C5/005 , C21C5/35 , C21C7/0685 , Y02P10/136
摘要： A process for decarburizing high-Cr molten pig iron under atmospheric pressure in a short time with minimized Cr loss due to oxidation is disclosed. A fundamental feature of the process comprises top-blowing decarburizing O2 diluted with an inert gas through a top-blowing lance against high-Cr molten pig iron in a vessel and at the same time blowing an inert gas through a bottom-blowing tuyere to vigorously stir the molten pig iron. Another feature of the process comprises controlling a slag amount in the above-described decarburizing blowing to thereby depress Cr loss due to oxidation. A further feature comprises conducting a predetermined denitrification after the blowing to thereby economically produce low-nitrogen molten iron with depressed Cr loss due to oxidation.

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