WO2007100109A1 - 溶銑脱燐方法 - Google Patents
溶銑脱燐方法 Download PDFInfo
- Publication number
- WO2007100109A1 WO2007100109A1 PCT/JP2007/054104 JP2007054104W WO2007100109A1 WO 2007100109 A1 WO2007100109 A1 WO 2007100109A1 JP 2007054104 W JP2007054104 W JP 2007054104W WO 2007100109 A1 WO2007100109 A1 WO 2007100109A1
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- WO
- WIPO (PCT)
- Prior art keywords
- dephosphorization
- hot metal
- slag
- treatment
- source
- Prior art date
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Classifications
-
- 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
- C21C1/00—Refining of pig-iron; Cast iron
- C21C1/02—Dephosphorising or desulfurising
- C21C1/025—Agents used for dephosphorising or desulfurising
-
- 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
- C21C1/00—Refining of pig-iron; Cast iron
- C21C1/02—Dephosphorising or desulfurising
-
- 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
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/064—Dephosphorising; Desulfurising
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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
- C21C5/28—Manufacture of steel in the converter
- C21C5/36—Processes yielding slags of special composition
Definitions
- the present invention relates to a dephosphorizat ion method for hot metal performed as a hot metal pretreatment.
- the hot metal pretreatment method in which dephosphorization treatment is performed in the hot metal stage has been widely used. This is because the dephosphorization reaction proceeds more thermodynamically as the temperature of the milling is lower (although there is a lower limit of the temperature that can be treated), and the dephosphorization process is performed with a smaller amount of the refining agent. This is because it can be done.
- a solid oxygen source such as iron oxide is added to the hot metal for desiliconization treatment.
- a refinement agent dephosphorizing agent and solvent ( Add fluxing agent)
- a CaO-based fertilizer such as lime is used as the dephosphorizing agent
- a solid oxygen source such as iron oxide or gaseous oxygen is used as the oxygen source.
- processing containers topped cars, ladles (charging pots), converter-type containers, etc. are used.
- C a F 2 fluorite
- JP-A-9-143529 a relatively good Mn yield is achieved when powder is supplied by bottom blowing, despite the low CZS operation.
- Attempts to quantify the agitation force due to powder blowing have not been fully successful, but experience has shown that it is much greater than, for example, the agitation force due to gas alone. Therefore, the effect described in the publication is considered to be due to the strong stirring force by the powder blown at the bottom.
- the Mn yield is extremely low when the powder is not sprayed at the bottom (Table 1 of the publication).
- special equipment is required and the tuyere is severely worn. In order to replace the tuyere, it is necessary to stop the tumbling.
- an object of the present invention is to provide a method that can efficiently perform hot metal dephosphorization by promoting the degassing reaction while ensuring a high yield of Mn, and has a low equipment burden. It is an object of the present invention to provide a hot metal dephosphorization method that can be realized with the addition amount as small as possible or without the addition of F source.
- the present inventors have studied the optimum dephosphorization treatment conditions that can solve the above-mentioned problems.
- the slag basicity after treatment is set to a relatively high specific region, and the hot metal treatment end point temperature is a predetermined level or higher.
- the dephosphorization reaction is promoted while ensuring a high Mn yield and efficient hot metal dephosphorization. I found out that I can do it.
- the hot metal dephosphorization processing conditions
- the basicity of the slag (% C a 0 /% S i 0 2 ) is more than 2.2 and less than or equal to 3.5
- the T.Fe concentration is 10 to 3 O mass%
- a hot metal dephosphorization method characterized in that the treatment end point temperature is 1 3 20 ° C or higher.
- the basicity (% C a 0 /% S i 0 2 ) of the slag is set to 2.2 at least by the end of the dephosphorization treatment.
- At least the T.Fe concentration of the slag is set to 15 to 2 by the end of the dephosphorization treatment.
- titanium oxide slag after treatment (where, T i O 2 equivalent) and the total content of A 1 2 0 3 is. 3 to 1 5 mas s %.
- a hot metal dephosphorization method comprising adding at least one selected from the above-mentioned titanium oxide source opium A 1 2 0 3 source so as to be%.
- Fig. 1 is a graph showing the relationship between slag basicity czs (horizontal axis) and dep-ratio (%) (vertical axis) after dephosphorization.
- Figure 2 shows slag basicity after dephosphorization C / S (horizontal axis) and Mn yield (%) It is a graph which shows the relationship with (vertical axis).
- Figure 3 is a graph showing the relationship between hot metal dephosphorization end point temperature (° C) (horizontal axis) and P removal rate (%) (vertical axis).
- Figure 4 is a graph showing the relationship between hot metal dephosphorization end point temperature (° C) (horizontal axis) and Mn yield (%) (vertical axis).
- Fig. 5 is a graph showing the relationship between the T. Fe concentration ( maSS %) (horizontal axis) and the dephosphorization rate (%) (vertical axis) of slag after dephosphorization.
- Figure 6 is a graph showing the relationship between the T.Fe concentration (ma SS %) (horizontal axis) and the Mn yield (%) (vertical axis) of slag after dephosphorization.
- the hot metal is dephosphorized. Most of the slag is formed during the dephosphorization process. For example, a part of the slag may be carried over from the previous charge.
- the present invention by optimizing the three conditions of the slag basicity after the treatment, the T. Fe concentration, and the treatment end point temperature of the hot metal as described above, high Mn is obtained by the following actions (I) to (!). Hot metal dephosphorization can be performed with yield and dephosphorization efficiency.
- dephosphorization treatment is performed by adding a refinement agent mainly composed of a CaO source and an oxygen source to the hot metal.
- the C a O source is a secondary raw material containing a C a compound capable of forming C a O or C a O (C a CO s , C a (OH) 2 ′, C aMg 0 2, etc.).
- the Examples of the source of C a O include quick lime, but limestone, slaked lime, dolomite, and used slag (converter dredging, reaming, agglomeration, etc.) are also included.
- a “Mixing agent mainly composed of O source” refers to those containing 40% by weight or more converted into O from the source of thirty.
- the other components of the spirits will be described in detail later.
- the preparation can be supplied to the hot metal by any method, such as top loading, injection from the immersion lance into the hot metal, or projection through the upper spray lance. Of these, top loading, projection with a top blow lance, and combinations thereof are suitable with little damage to the equipment, and sufficient effects can be obtained with these means.
- gaseous oxygen oxygen gas or oxygen-containing gas
- Solid oxygen sources eg, iron ore, mill scale, sand iron, dust collection dust (iron oxide such as' dust containing iron recovered from blast furnace, converter, sintering process, etc.
- any method such as top blowing with a top blowing acid lance, injection into hot metal or bottom blowing, etc., and for a solid oxygen source from top loading and immersion lances
- Each can be supplied into the hot metal by any method such as injection into the hot metal or projection through an upper blowing lance.
- top blowing gaseous oxygen
- top charging solid oxygen source
- projection with a top blowing lance solid oxygen source
- any combination of these are suitable with little damage to the equipment.
- sufficient effects can be obtained by these means.
- an inert gas or oxygen gas is blown from a nozzle (feather) embedded in the bottom of the furnace. Gas agitation is performed.
- the high temperature in the dephosphorization process is achieved by performing high-temperature treatment at 1 320 ° C. (end temperature of hot metal treatment) or higher and making the slag basicity after treatment more than 2.2.
- the yield of Mn is obtained and the high temperature treatment promotes the hatching of C a O, so that the effect of improving the dephosphorization efficiency by increasing the slag basicity can be sufficiently brought out.
- the slag basicity after the treatment exceeds 3.5, the proportion of the solid phase in the slag becomes high, the reactivity is lowered, and poor degassing is caused.
- the slag basicity after the treatment is preferably 3.5 or less.
- the slag basicity after the treatment is more than 2.2 and less than 3.5, and more preferably 2.5 to 3.0.
- the blast furnace hot metal previously desiliconized was dephosphorized using a converter type vessel (300 ton).
- CaO-based quick lime not containing a fluorine source such as fluorite was placed on top as a dephosphorization agent.
- oxygen gas was supplied with an upper blow lance and a solid oxygen source mainly composed of iron ore was placed on top.
- the conditions for sending oxygen gas were as follows: ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ 3 , !!
- the oxygen basic unit was set to 1 2 ⁇ 3 / molten iron t excluding oxygen necessary for desiliconization.
- the slag basicity C / S was varied from 1.7 to 4.1 by adjusting the amount of quicklime input. Also, the supply ratio of the gaseous oxygen source and the solid oxygen source was adjusted so that the hot metal temperature after dephosphorization was 1350 ° C.
- the target for dephosphorization rate of phosphorus in hot metal was set to 80% or higher, and the target for the yield of Mn in hot metal was set to 30% or higher.
- the P removal rate (%) and Mn yield (%) are defined by the following equations.
- Fig. 1 and Fig. 2 show the results of examining the relationship between the slag basicity C / S after treatment on the horizontal axis and the relationship between 'de-P ratio (%) and Mn yield (%). According to this, when the slag basicity CZS is 2.2 or less, the P-free rate and Mn yield are low. On the other hand, when the slag basicity CZ S is more than 2.2 and less than 3.5, both the P removal rate and the Mn yield reach the target values. However, when the slag basicity CS exceeds 3.5, the P removal rate decreases again.
- the slag basicity C / S is more than 2.2 and less than 3.0, the results show that the variation in P removal rate is particularly small and stable.
- the fertilizer instead of placing the fertilizer on top, the fertilizer mainly composed of quick lime powder is used. The same tendency was observed when the agent was projected from the top blowing lance.
- control of the input amount of a known SiO 2 source such as silica stone brick waste, There are means such as pre-silicon removal treatment and adjustment of the Si concentration in the hot metal by adding Fe Si alloy. Dephosphorization end point temperature>
- the high temperature treatment at which the hot metal treatment end point temperature is 1 320 ° C. or higher promotes the hatching of C a O. Therefore, the dephosphorization efficiency due to the increased slag basicity.
- the improvement effect of can be fully drawn out.
- Mn yield is a favorable condition in terms of thermodynamics.
- a more preferable treatment end point temperature is 1350 ° C or higher.
- the treatment end point temperature exceeds 140 ° C., the temperature condition becomes unfavorable for dephosphorization, and a large amount of slag is required to compensate for this, resulting in the Mn yield in the subsequent decarburization process. Decreases significantly.
- the hot metal treatment end point temperature is 1 320 ° C or higher, preferably 1350 ° C or higher, and its upper limit is preferably 1400 ° C. . '
- the hot metal treatment end point temperature is usually measured after the steel is put in the ladle because of the equipment. Therefore, in the present invention, the temperature measured after the steel was taken out was also adopted in the ladle. This is generally about 20 ° C lower than measured in the converter vessel.
- the blast furnace hot metal previously desiliconized was dephosphorized using a converter-type vessel (300 to 11).
- CaO-based quick lime not containing a fluorine source such as fluorite as a dephosphorizing agent was placed on top.
- the amount of quicklime input was adjusted so that the slag basicity after denitrification was 3.0.
- blow up oxygen gas And a solid oxygen source mainly composed of iron ore was placed on top.
- the conditions for sending oxygen gas (pure oxygen gas) were set to 1 5 0 0 0 to 4 0 0 0 Nm 3 / hr.
- the unit oxygen consumption was 1 2 Nm 3 hot metal t, excluding oxygen necessary for desiliconization.
- the hot metal treatment end point temperature was changed to about 1 3 1 0-1 4 30 ° C by adjusting the supply ratio of gaseous oxygen source and solid oxygen source.
- Fig. 3 and Fig. 4 show the relationship between hot metal treatment end point temperature (° C) on the horizontal axis and P ratio (%) and Mn yield (%).
- the condition where the dephosphorization rate of phosphorus in hot metal is 80% or more and the yield of Mn in hot metal is 30% or more is that the end point temperature of the treatment is in the range of 1 320 to 1400 ° C. I understand that. It can also be seen that when the temperature is higher than 1350 ° C, the variation in the lower limit of the Mn yield becomes smaller and stable. In the above example, the same tendency was observed when the fertilizer mainly composed of quick lime powder was projected from the top blowing lance instead of placing the fertilizer on top.
- the supply ratio of gaseous oxygen source and solid oxygen source is adjusted as described above, the input amount of iron source such as scrap is adjusted, the input amount of charcoal, etc. There are means such as adjustment.
- the T. Fe concentration of the treated slag by setting the T. Fe concentration of the treated slag to 1 Omass% or more, it is possible to compensate for a decrease in dephosphorization efficiency due to a high temperature treatment unfavorable for dephosphorylation. Combined with optimization, high dephosphorization efficiency can be obtained. From this viewpoint, the more preferable lower limit of the T.Fe concentration is 15 mass%. On the other hand, if the T.Fe concentration of the slag after treatment exceeds 3 Oma SS %, the iron content discharged with the slag will increase, and a decrease in iron yield cannot be ignored. From this point of view, the more preferable upper limit of T. Fe concentration is 25 mass ° / 0 .
- the T.6 concentration of the slag after the treatment is 10 to 30 mass%, preferably 15 to 25 mass%.
- the slag basicity and end point temperature of the present invention in order to increase the T. Fe concentration in the slag after the treatment to 10 mas S % or more, it is necessary to increase the T. Fe concentration. An aggressive operation is required, and without this operation, the T. Fe concentration cannot be increased to 1 Omass% or more.
- Soft blow from the top blowing acid lance reduces the rate of acid feeding from the lance and reduces the dynamic pressure of the hot metal bath surface caused by the kinetic energy of the gaseous oxygen blown above (for example, 0.03). MP a or less, preferably 0.0 2 MP a or less).
- the dynamic pressure P d (MP a) on the hot metal bath surface is given by
- H L Lance height, height (m)
- the oxygen is sufficiently supplied to the slag, and the T. Fe in the slag can be maintained at a high concentration.
- the soft blow may be performed at least in the second half of the dephosphorization process.
- a large amount of iron oxide source is added in the latter half or the last stage in order to secure the T.Fe concentration in the latter half of the treatment. In this case, for example, more than 2/3 of the planned iron oxide input is input after the midpoint of the treatment period (blowing period).
- the charging method can be any method such as top loading, or shooting from the top blowing lance.
- the blast furnace hot metal previously desiliconized was dephosphorized using a converter type vessel (300 ton).
- CaO-based quick lime not containing a fluorine source such as fluorite was placed on top as a dephosphorization agent.
- the input amount of quicklime was adjusted so that the slag basicity after dephosphorization treatment was 3.0.
- oxygen gas was supplied with a top blowing lance and a solid oxygen source mainly composed of iron ore was placed on top.
- the oxygen gas sending conditions were set to 1 500 00 to 40000 Nm 3 / hr.
- the oxygen unit was 12 Nm 3 / molten iron t, excluding oxygen required for desiliconization.
- the supply ratio of the gaseous oxygen source and the solid oxygen source was adjusted so that the hot metal temperature after the degassing treatment was 1350 ° C.
- the input pattern of the solid oxygen source was variously changed, and the slag T.Fe concentration after the treatment was changed to about 5 to 28%.
- T. F concentration 15 ma SS % or higher
- 2/3 or more of the planned solid oxygen source input should be input after the midpoint of the treatment period (blowing period).
- the higher the F e the higher the input ratio after the middle point.
- Figure 5 and Figure 6 show the relationship between the T. Fe concentration (m aSS %) of the treated slag on the horizontal axis and the P removal rate (%) and Mn yield (%). According to this, it can be seen that if the T. Fe concentration is 10 mass% or more, both the P removal rate and the Mn yield satisfy the target.
- the slag basicity and the treatment end point temperature Because of the predominance of the optimization effect, high yield and Mn yield are obtained. It can be seen that when the T. Fe concentration is 15 mass% or more, the Mn yield variation is particularly small and stable. In the above example, the same tendency was observed when the fertilizer mainly composed of quick lime powder was projected from the top blowing lance instead of placing the fertilizer on top.
- the concentration of slag is reduced to 0 throughout the treatment period by using an astringent that does not substantially contain an F source (such as C a F 2 ) or an astringent with a small amount of F source. It is preferable to be 2 mass% or less, and in the present invention, high dephosphorization efficiency can be obtained even if such a fertilizer is used.
- the slag F concentration may also be managed by the value after treatment.
- an acupuncture agent does not contain F source means that it does not contain F source substantially, and therefore it does not preclude the inclusion of a small amount of F source as an unavoidable impurity, for example.
- titanium oxide source or Roh ⁇ Pi A 1 2 0 3 source as part of the fine ⁇ , dregs of C a O-based fine ⁇ is promoted, further, the slag oxygen potential As a result, the dephosphorization ability of the slag is also improved. As a result, the dephosphorization reaction is further promoted, so that more efficient hot metal desulfurization can be performed.
- titanium oxide source or ⁇ Pi A 1 2 0 3 source which functions as a slag formation accelerators C a O Keisei ⁇ agent since the titanium oxide source or ⁇ Pi A 1 2 0 3 source which functions as a slag formation accelerators C a O Keisei ⁇ agent, the amount of substantially free or F sources F source as described above is small This is particularly effective when a seminal agent is used.
- Titanium oxide has forms such as T i O, T i 0 2 , T i 2 0 3 , T i 3 0 5, etc., but any form may be used.
- the titanium oxide-containing material that is the source of titanium oxide include iron sand, ilmenite ore (titanium iron ore), and rutile ore.
- iron sand is generally a fine particle having a particle size of 1 mm or less, and is particularly suitable because it melts rapidly in the reaction vessel.
- the T.Fe concentration in the slag can be increased, that is, it also functions as an iron oxide source.
- titanium oxide-containing iron ore is also preferable from this point.
- Iron sand is quality differs depending production locations, generally T i O 2 containing 5 to about 8 mass%, at high casting also those containing about 1 3 mass%.
- Irumenai preparative ore and rutile ores usually contain T i 0 2 3 O mass% or more.
- Ti oxide-containing material is titanium oxide source
- Substances with a titanium oxide content of less than 3 m a S S % in terms of Ti O 2 are difficult to obtain the effect of promoting the hatching of C a O-based refined agents. This increases the amount of slag and causes problems such as a decrease in Mn yield. Therefore, in any case, a substance containing only a small amount of titanium oxide is not suitable as a titanium oxide source (titanium oxide-containing substance).
- a 1 2 0 3 commercially available calcium aluminate-based medium solvents, aluminum oxide-containing ores such as aluminum ash and porkite can be used. In addition, by-products from the steelmaking process that contain high concentrations of aluminum oxide, such as ingots, secondary refined slag, and brick scraps, can also be used.
- a 1 2 0 3 source one containing 2 O mass% or more in terms of A 1 2 O 3 is preferable.
- the amount of titanium oxide source and / or A 1 2 O 3 source added is the sum of the contents of titanium oxide (in terms of T i O 2 ) and A 1 2 O 3 in the slag after treatment. It is preferable that the amount is not more than mass%. If the total content exceeds 15 mass%, the CaO necessary for the dephosphorization reaction will be diluted and the dephosphorization ability will be reduced. In the normal dephosphorization operation, both of them are unavoidably included in the slag in the range of about 1.0 to 2.5% mass, but if it is less than 3 mass%, the C a O-based fertilizer is hatched. The promotion effect is not enough.
- the titanium oxide in the slag after treatment (where, T i 0 2 conversion) the sum of the A 1 2 0 3 content is preferably set to 3 ma SS% or more.
- an MgO source or the like can be added for the purpose of protecting the furnace body. ⁇ Others>.
- any container such as a converter type container, a hot metal ladle, and a torpedo can be used, but a free board (the surface of the molten metal in the container).
- a converter type vessel is most preferable because a sufficient margin from the upper surface of the slag to the upper end of the vessel wall can be secured.
- the hot metal dephosphorization of the present invention is most preferable because a sufficient margin from the upper surface of the slag to the upper end of the vessel wall can be secured.
- the hot metal treatment time is preferably about 5 to 30 minutes, although it depends on the shape and capacity of the container.
- the dephosphorization of the hot metal can be easily carried out to a P content (component standard value of steel) or less required for the crude steel.
- P content component standard value of steel
- dephosphorization to below the P content (steel component specification value) required for hot metal in crude steel eliminates the need for substantial dephosphorization in the subsequent decarburization process.
- Decarburization and refinement can be performed with a very small amount of slag, and as a result, a high Mn yield can be achieved especially when Mn ore is added to increase the Mn concentration in molten steel.
- decarburization and refinement can be greatly simplified and the refinement time can be shortened, so that overall steelmaking efficiency can be improved.
- Examples of the P content required for crude steel include 0.03 mass% or less (general steel), 0.015 mass SS or less (low phosphorus steel), and the like.
- the blast furnace hot metal (Mn concentration 0.3 mass%) previously desiliconized was dephosphorized using a converter type vessel (3 0 0 ton).
- a dephosphorizing agent C firefly as a dephosphorizing agent C a O-based quicklime that does not contain a fluorine source such as stone was placed on top.
- oxygen gas was supplied with a top blow lance and a solid oxygen source mainly composed of iron ore was placed on top.
- the oxygen gas sending conditions were 1 ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ 3 , hr.
- the unit oxygen consumption was 1 2 Nm 3 hot metal t, excluding oxygen necessary for desiliconization.
- the hot metal was charged into another converter vessel (300 ton) for decarburization.
- Mn ore was put on top as Mn source.
- the input amount of Mn ore was 4 kg in terms of pure Mn per ton of molten steel.
- Table 1 shows the dephosphorization rate and Mn yield after dephosphorization, together with denitrification conditions. Table 1 also shows the Mn yield for total decarburization and decarburization. The Mn yield in the dephosphorization / decarburization total was calculated using the following formula.
- Total Mn yield ⁇ (Mn concentration after decarburization) / [(Mn concentration before dephosphorization) + '(Mn concentration introduced during decarburization)] ⁇ X I 0 0
- titanium oxide source sand (T i 0 2 content: 7. 5 mass%) or aluminum oxide source Zokatamarikasu (A 1 2 0 3 content: 3
- the dephosphorization treatment and the decarburization treatment were performed in the same manner as in Example 1 except that Omass%) was placed on top.
- the concentration of T i O 2 in the dephosphorization slag in the blowing iron using sand iron was 4. Omass%, and the total content of T i 0 2 and A 1 2 0 3 was 6.3 mass%.
- the concentration of A 1 2 0 3 in dephosphorization slag in blown rice cakes using ingots is 4.5 mass ° / 0
- the total content of Ti 0 2 and A 1 2 0 3 is 6. lmass% Met.
- Table 2 shows the dephosphorization rate and Mn yield after dephosphorization, along with dephosphorization conditions.
- Table 2 also shows the total Mn yield for dephosphorization and decarburization.
- the P removal rate after dephosphorization blowing was 85% or more and the Mn yield was 40% or more. As a result, the total Mn yield of dephosphorization and decarburization exceeded 45%.
- Example of the present invention Ingot milling 1370 3.0 15 86 50 4 0.32 49.7 (Example 3)
- the blast furnace hot metal (Mn concentration 0.3 mass%) previously desiliconized was dephosphorized using a converter type vessel (3 0 0 ton).
- oxygen gas was supplied in an up-blasting lance, and a solid oxygen source mainly composed of iron ore was placed on top.
- raw calcium ash or calcium carbonate mainly composed of CaO containing no fluorine source such as fluorite as a dephosphorizing agent was projected from an upper blowing lance together with oxygen gas.
- Oxygen gas sending conditions are 15 00 00-4 0 00 0 0 Nm 3 hr, and the amount of dephosphorization is adjusted within the range of 6 0 0 0-3 0 0 0 Okg / hr.
- the unit oxygen consumption was 1 2 Nm 3 / molten iron t, excluding oxygen required for desiliconization.
- the acid sent from the top blowing lance is 0.03MPa when the dynamic pressure of the hot metal bath surface is set to 0.01 to 0.02MPa in the second half of the refinement period (soft blow). Two cases of exceeding (hard blow) were performed.
- iron oxide (T i 0 2 content: 7.5 mass%) as a titanium oxide source or brick scrap (A 1 as a source of aluminum oxide) is used as part of the dephosphorizing refinement agent. 20 3 content: 30 ma SS %) was similarly placed on top.
- Hot metal bath surface dynamic pressure due to acid sent from top blowing lance is 0.01-0.02MPa heart rate in the second half of the milling period.
- the dynamic pressure of the bath surface exceeds 0.03 MPa in the second half of the period
- the P removal rate after dephosphorization blowing was 85% or more, and the Mil yield was 40% or more, and the total M'n yield of dephosphorization / decarburization was 45%. The result exceeded.
- the blast furnace hot metal (Mn concentration 0.3 ma SS %) previously desiliconized was dephosphorized using a converter vessel (3 0 ton).
- oxygen gas was supplied by an up-blow lance, and most of the solid oxygen source mainly composed of scale was projected together with an inert gas from another projection port provided in the lance.
- There are two ways to remove phosphorous such as fluorite and other CaO-based quicklime as a dephosphorization agent and to project it from an upper blowing lance with oxygen gas. went.
- the oxygen gas sending condition was 15 000 40000. NmS / Zhr, and the amount of dephosphorization was adjusted within the range of 600 000 Okg / hr. 'Oxygen basic unit was 1 2 ⁇ 3 molten iron t, excluding oxygen necessary for desiliconization. Oxidation from the top blowing lance is performed when the dynamic pressure of the hot metal bath surface is 0.01 to 0.02MPa in the second half of the refinement period (soft blow ⁇ "). Two cases were performed when exceeding 3 MPa (hard blow).
- an agglomerate (A 1 2 0 3 content: 30 mass ° / 0 ), which is the source of aluminum oxide, was similarly placed on top. I entered.
- Top blowing projection Projecting CaO source from top blowing lance
- the P removal rate after dephosphorization blowing was 85% or more and the Mn yield was 40% or more, and the total Mn yield of dephosphorization and decarburization was 45%. The result exceeded.
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- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
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Abstract
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CN200780006368.7A CN101389771B (zh) | 2006-02-28 | 2007-02-26 | 铁水脱磷方法 |
BRPI0708359-9A BRPI0708359A2 (pt) | 2006-02-28 | 2007-02-26 | método para desfosforação de metal quente |
KR1020087020316A KR101251093B1 (ko) | 2006-02-28 | 2007-02-26 | 용선탈린방법 |
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CN (2) | CN104531948B (ja) |
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CN101956045B (zh) * | 2010-09-27 | 2012-09-05 | 攀钢集团钢铁钒钛股份有限公司 | 精炼渣及钢水精炼方法 |
KR101237487B1 (ko) * | 2010-10-07 | 2013-02-26 | (주)유진에코씨엘 | 제강 부산물을 활용한 예비처리 탈린 향상방법 |
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KR102189097B1 (ko) * | 2016-12-26 | 2020-12-09 | 닛폰세이테츠 가부시키가이샤 | 용선의 예비 처리 방법과 극저인강의 제조 방법 |
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JPH10237526A (ja) * | 1997-02-26 | 1998-09-08 | Sumitomo Metal Ind Ltd | 溶銑の脱りん方法 |
JP2000345226A (ja) * | 1999-06-02 | 2000-12-12 | Sumitomo Metal Ind Ltd | 溶銑の脱りん方法 |
JP2001040409A (ja) * | 1999-07-30 | 2001-02-13 | Nippon Steel Corp | 溶銑の脱燐方法 |
JP2003055707A (ja) * | 2001-08-10 | 2003-02-26 | Kawasaki Steel Corp | 溶銑の脱燐方法 |
JP2005272883A (ja) * | 2004-03-23 | 2005-10-06 | Sumitomo Metal Ind Ltd | 鋼の製造方法 |
JP2005336586A (ja) * | 2004-05-31 | 2005-12-08 | Jfe Steel Kk | 溶銑の脱燐処理方法 |
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CN1046139C (zh) * | 1997-10-08 | 1999-11-03 | 冶金工业部钢铁研究总院 | 铁水预脱磷方法 |
JP2002309310A (ja) * | 1998-06-18 | 2002-10-23 | Nkk Corp | 低燐溶銑の製造方法 |
JP2002249814A (ja) * | 2000-12-21 | 2002-09-06 | Nkk Corp | 低燐溶銑の製造方法 |
CN100351399C (zh) * | 2001-02-07 | 2007-11-28 | 新日本制铁株式会社 | 生铁熔体脱磷的方法 |
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- 2007-02-26 WO PCT/JP2007/054104 patent/WO2007100109A1/ja active Application Filing
- 2007-02-26 KR KR1020087020316A patent/KR101251093B1/ko active IP Right Grant
- 2007-02-26 CN CN201410697005.4A patent/CN104531948B/zh active Active
- 2007-02-26 CN CN200780006368.7A patent/CN101389771B/zh active Active
- 2007-02-27 TW TW096106728A patent/TWI318644B/zh active
Patent Citations (6)
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JPH10237526A (ja) * | 1997-02-26 | 1998-09-08 | Sumitomo Metal Ind Ltd | 溶銑の脱りん方法 |
JP2000345226A (ja) * | 1999-06-02 | 2000-12-12 | Sumitomo Metal Ind Ltd | 溶銑の脱りん方法 |
JP2001040409A (ja) * | 1999-07-30 | 2001-02-13 | Nippon Steel Corp | 溶銑の脱燐方法 |
JP2003055707A (ja) * | 2001-08-10 | 2003-02-26 | Kawasaki Steel Corp | 溶銑の脱燐方法 |
JP2005272883A (ja) * | 2004-03-23 | 2005-10-06 | Sumitomo Metal Ind Ltd | 鋼の製造方法 |
JP2005336586A (ja) * | 2004-05-31 | 2005-12-08 | Jfe Steel Kk | 溶銑の脱燐処理方法 |
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TW200741014A (en) | 2007-11-01 |
KR101251093B1 (ko) | 2013-04-04 |
CN101389771A (zh) | 2009-03-18 |
CN101389771B (zh) | 2015-12-16 |
CN104531948B (zh) | 2017-04-12 |
TWI318644B (en) | 2009-12-21 |
BRPI0708359A2 (pt) | 2011-05-24 |
CN104531948A (zh) | 2015-04-22 |
KR20080089650A (ko) | 2008-10-07 |
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