WO2017130837A1 - Procédé d'élimination de scories, procédé de production de scories, et structure d'amortissement d'énergie de chute de scorie - Google Patents

Procédé d'élimination de scories, procédé de production de scories, et structure d'amortissement d'énergie de chute de scorie Download PDF

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Publication number
WO2017130837A1
WO2017130837A1 PCT/JP2017/001784 JP2017001784W WO2017130837A1 WO 2017130837 A1 WO2017130837 A1 WO 2017130837A1 JP 2017001784 W JP2017001784 W JP 2017001784W WO 2017130837 A1 WO2017130837 A1 WO 2017130837A1
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WO
WIPO (PCT)
Prior art keywords
slag
pan
converter
guide plate
contact member
Prior art date
Application number
PCT/JP2017/001784
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English (en)
Japanese (ja)
Inventor
憲一郎 内藤
孝夫 中切
邦俊 松永
Original Assignee
新日鐵住金株式会社
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by 新日鐵住金株式会社 filed Critical 新日鐵住金株式会社
Priority to JP2017564203A priority Critical patent/JP6589998B2/ja
Priority to CN201780002581.4A priority patent/CN107849626B/zh
Priority to KR1020187002598A priority patent/KR20180019745A/ko
Publication of WO2017130837A1 publication Critical patent/WO2017130837A1/fr

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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
    • 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
    • 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
    • C21C5/42—Constructional features of converters
    • C21C5/46—Details or accessories
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D3/14—Charging or discharging liquid or molten material
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D2003/0034—Means for moving, conveying, transporting the charge in the furnace or in the charging facilities
    • F27D2003/0054—Means to move molten metal, e.g. electromagnetic pump

Definitions

  • the present disclosure relates to a draining method, a slag manufacturing method, and an energy attenuation structure of a flowing slag.
  • the converter After desiliconization and dephosphorization of the molten iron in the converter, the converter is tilted while leaving the molten iron in the converter, and a part of the upper slag is allowed to flow down from the furnace port to the waste pan placed below. And the method of performing a decarburization process after that is known. In this method, the slag is formed (foamed) in the converter to increase the bulk volume of the slag, thereby ensuring the exhaustability. Slag forming occurs when carbon in the molten iron and iron oxide in the slag generate CO gas by the reaction of the following formula (1), and the CO gas is held in the slag.
  • Japanese Patent No. 4907411, Japanese Patent No. 4580434 and Japanese Patent No. 4580435 disclose a method of calming the forming by putting the forming sedative into the slag pan. Yes.
  • the sedative material calms the slag formed by the action of a chemical reaction or the like, there is a limit to the sedative effect depending on the input amount of the forming sedative material.
  • Japanese Patent No. 500060 discloses a method of calming the slag forming in the slag pan by microwave irradiation.
  • problems such as microwave shielding.
  • Japanese Patent No. 2558292 discloses a water-cooled pre-furnace pre-proofing plate for preventing slag from flowing out and splashing to the work floor at the time of evacuation and allowing the slag to flow into the culvert pan.
  • the water-cooled pre-furnace fender is not intended to calm down the slag forming in the discharge pan.
  • This disclosure is intended to provide a method of removing the slag that is allowed to flow down from the converter and accommodated in the pan, and to provide a method for producing the slag using the slag and an energy attenuating structure for the slag.
  • the present inventors have provided a slag pan in which a portion of the upper slag is disposed downward from the furnace port by tilting the converter while desiliconizing and dephosphorizing the molten iron in the converter and leaving the molten iron in the converter.
  • the present inventors found that the carbon in the molten iron mixed in the slag flowing down from the converter and the iron oxide in the slag newly generated CO gas by the reaction of the above-mentioned formula (1) in the waste pan. It was found that the generation was one of the factors that hindered the sedation of forming in the slag pan.
  • the present inventors pay attention to suppressing the reaction of the above-described formula (1) between the carbon in the molten iron and the iron oxide in the slag in the waste pan, and the slag flows down into the waste pan. It has been found that it is effective to suppress agitation caused by an impact during the process.
  • the present disclosure is based on such knowledge.
  • the exclusion method is as follows. By tilting the converter after performing at least one of desiliconization, dephosphorization, and decarburization in the converter, the upper layer formed slag is left in the converter while leaving the molten iron in the converter. Flow down from the furnace port to the first position of the contact member, The contact member moved from the first position to a second position that is shifted from the first position in the lateral direction perpendicular to the vertical direction and that is positioned below the first position. Causing the slag to flow down from the second position; The slag flowing down from the second position is accommodated in a pan disposed below the converter, Exclusion method.
  • the energy attenuation structure of the falling slag is as follows.
  • a contact member formed with a surface in contact with the slag flowing down from the furnace port of the converter by tilting the converter, the slag flowing down from the furnace port is received at a first position of the surface,
  • Contact that causes the slag that has moved along the surface to flow down into the pan from the second position which is shifted from the first position in the lateral direction perpendicular to the vertical direction and below the first position.
  • the draining method, the slag manufacturing method, and the flowing-down slag energy attenuating structure of the present disclosure the forming of the slag that flows down from the converter and is accommodated in the pan is easily subdued.
  • the direction indicated by the arrow X and arrow -X in the drawing is the width direction of the energy attenuating structure 10 (see FIG. 1), and the direction indicated by the arrow Z and arrow -Z in the drawing is the vertical direction (hereinafter referred to as the arrow Z direction). Is the upper side, and the arrow-Z direction is the lower side).
  • the direction perpendicular to the width direction and the vertical direction is the depth direction.
  • the width direction is an example of a horizontal direction.
  • the energy attenuating structure 10 of the present embodiment flows down from the converter 20 when the slag S flowing down from the converter 20 (see FIG. 1) is accommodated in the discharge pot 30 (see FIG. 1).
  • 30 has a function of attenuating the energy of the slag S by bringing a concave surface 42A (see FIG. 2) of a guide plate 42 (see FIG. 1), which will be described later, into contact with the slag S before being accommodated in the slag 30.
  • the waste pan 30 is an example of a pan.
  • the slag S flowing down from the converter 20 to the waste pan 30 is an example of a flowing down slag.
  • the guide plate 42 is arrange
  • the converter 20 has an opening 22 (furnace port).
  • the converter 20 is configured to be tiltable with respect to the vertical direction by a rotating device (not shown) whose depth direction is the rotation axis direction.
  • the slag pan 30 is moved by a carriage 50 which will be described later, and is arranged below the converter 20.
  • the waste pan 30 includes a circular bottom 32 as viewed from above, and a peripheral wall 34 having an inner peripheral surface 34 ⁇ / b> A whose inner diameter increases toward the upper side. That is, the waste pan 30 of this embodiment is an inverted truncated cone shape.
  • FIG. 1 The converter 20 has an opening 22 (furnace port).
  • the converter 20 is configured to be tiltable with respect to the vertical direction by a rotating device (not shown) whose depth direction is the rotation axis direction.
  • the slag pan 30 is moved by a carriage 50 which will be described later, and is
  • FIG. 1 shows a state in which the converter 20 is rotated by the rotating device and is inclined to flow down (discharge) the slag S.
  • the lower end of the opening 22 of the converter 20 is shown.
  • the separation distance from the upper end of the waste pan 30 is 3 to 10 m.
  • the energy attenuating structure 10 of the present embodiment includes a guide portion 40 as shown in FIG.
  • the guide part 40 includes a guide plate 42 and a support part 44.
  • the guide plate 42 is an example of a contact member.
  • the guide plate 42 is supported by the support portion 44 in a state where the guide plate 42 is inclined 10 ° clockwise as an example with respect to the vertical direction in a front view.
  • the guide plate 42 comes into contact with the slag S flowing down from the converter 20 at a recessed surface 42A (see FIG. 2). That is, the guide plate 42 is formed with a recessed surface 42 ⁇ / b> A that flows down from the converter 20 and comes into contact with the slag S accommodated in the discharge pan 30.
  • the recessed surface 42A is an example of a surface.
  • the guide plate 42 has a bowl shape.
  • the guide plate 42 has a curved shape in which a cross-sectional shape perpendicular to the direction in which the slag S flows is convex downward.
  • the guide plate 42 of the present embodiment is made of steel as an example.
  • the width of the guide plate 42 (that is, the dimension in the depth direction) is not particularly limited, but in the present embodiment, it is designed in a range of 0.5 to 1.0 times the diameter of the opening 22.
  • a work floor provided on the side of the converter 20 is used as the support portion 44.
  • the guide plate 42 is fixed to the work floor as the support portion 44 via a fixing member (not shown).
  • the work floor here is a floor located at the same height as the lower end of the opening 22 in a state where the converter 20 is rotated and inclined by about 90 °, and repair work or converter in the converter 20 is performed. This floor is used for repairing and replacing 20 bottom-blown tuyere.
  • the upper end of the guide plate 42 is located above the work floor, and the lower end 42 ⁇ / b> A ⁇ b> 2 of the guide plate 42. Is located below the work floor.
  • the converter 20 when discharging from the opening 22 of the converter 20, the converter 20 is tilted in a direction opposite to that when the steel is discharged from a steel outlet (not shown) provided in the converter 20.
  • the work floor to which the guide plate 42 is fixed is a work floor provided on the opposite side to the steel outlet in the upright converter 20.
  • the guide plate 42 receives the slag S flowing down from the converter 20 at the first position 42A1 of the recessed surface 42A and moves the slag S moved along the recessed surface 42A (downward). In addition, it is made to flow down into the waste pan 30 from the lower end 42A2 of the concave surface 42A.
  • “receiving the slag S flowing down from the converter 20 at the first position 42A1 of the recessed surface 42A” means that the slag S flowing down from the converter 20 collides with the first position 42A1 of the recessed surface 42A from above.
  • the lower end 42A2 is an example of a second position.
  • the lower end 42A2 is shifted from the first position 42A1 in the width direction orthogonal to the vertical direction, and below the first position 42A1.
  • the separation distance L in the up-down direction from the upper end of the waste pan 30 is 1 m as an example.
  • the inclination angle ⁇ of the guide plate 42 is formed by a vertical straight line (not shown) and a virtual straight line (not shown) connecting the first position 42A1 and the second position 42A2. The smaller one of the angles is used. Then, the inclination angle ⁇ of the guide plate 42 in this embodiment is 10 °.
  • the energy attenuating structure 10 of this embodiment includes a carriage 50.
  • the trolley 50 moves the slag pan 30 in the width direction so that the slag S flowing down in contact with the recessed surface 42 ⁇ / b> A is received by the inner peripheral surface 34 ⁇ / b> A of the sewage pan 30, thereby moving the slag S in the width direction. It has a function to adjust the position. That is, the cart 50 of this embodiment can be said to be a means for adjusting the position in the width direction of the waste pan 30.
  • the cart 50 includes a platform 52, a plurality of wheels 54, and a drive source (not shown).
  • the slag pan 30 is placed on the table 52.
  • the plurality of wheels 54 are attached to the base 52.
  • the drive source is controlled and operated by an operator.
  • the energy attenuating structure 10 of the present embodiment includes an adding unit 60.
  • the adding portion 60 has a function of adding the sedative material M to the slag S moving along the recessed surface 42A of the guide plate 42.
  • the addition part 60 is arrange
  • the sedative material M of the present embodiment is for calming the forming of the slag S, and as an example, is a papermaking sludge that is an inexpensive organic pyrolysis material and an inexpensive material for adjusting the specific gravity. It is formed by mixing steelmaking slag.
  • the operator moves the waste pan 30 placed on the carriage 50 to the lower side of the converter 20.
  • the converter 20 is rotated with a rotating apparatus, as FIG. 1 shows.
  • the slag S generated in the converter 20 flows down from the opening 22 of the converter 20 toward the guide plate 42.
  • the slag S flowing down from the converter 20 is received at the first position 42A1 on the recessed surface 42A of the guide plate 42, and the slag S moves along the recessed surface 42A to the lower end 42A2. Then, the slag S that has moved to the lower end 42A2 of the recessed surface 42A flows downward from the lower end 42A2. Moreover, the addition part 60 adds the soothing material M to the slag S which is moving along the concave surface 42A.
  • the slag S flowing down from the lower end 42A2 of the recessed surface 42A is received by the inner peripheral surface 34A of the sewage pan 30 and accommodated in the sewage pan 30.
  • the slag S is received by the inner peripheral surface 34 ⁇ / b> A.
  • the position of the slag pan 30 placed on the carriage 50 is adjusted before the flow of the slag S from the converter 20 is started.
  • the slag S accommodated in the slag pan 30 is then transported to the slag S cooling field (not shown), discharged from the slag pan 30, and then cooled to produce slag.
  • the first action is an action of attenuating the energy of the slag S by bringing the slag S flowing down from the converter 20 into contact with the recessed surface 42A.
  • the first action will be described with reference to the drawings while comparing the present embodiment with a comparative embodiment assumed below. In the description of the comparative embodiment, when the same components as those used in the present embodiment are used, the same reference numerals are given and detailed descriptions (including common actions) are omitted as appropriate.
  • the slag S generated in the converter 20 flows down toward the bottom 32 of the sewage pan 30 and is accommodated in the slag pan 30.
  • the addition part 60 adds the sedative material M toward the slag S in the waste pan 30.
  • the comparative form has the same configuration as the present embodiment except for the above points.
  • the slag S generated in the converter 20 flows down toward the bottom 32 of the slag pan 30 and is accommodated in the slag pan 30.
  • the potential energy of the slag S in the converter 20 is converted into the kinetic energy of the slag S, in other words, the stirring energy in the discharge pan 30.
  • the stirring energy of the slag S in the slag pan 30 is large, the mixing of the slag S accommodated in the slag pan 30 and the molten iron F mixed and contained in the slag S, that is, Mass transfer will be promoted.
  • the reaction between the carbon in the molten iron F and the iron oxide in the slag S promotes the generation of new CO gas in the waste pan 30 and promotes the formation of the slag S ( Forming sedation is inhibited).
  • the slag S flowing down from the converter 20 comes into contact with the recessed surface 42 ⁇ / b> A of the guide plate 42 and is then accommodated in the discharge pan 30.
  • the slag S flowing down from the converter 20 is attenuated in potential energy when the slag S is accommodated in the converter 20 due to contact frictional resistance with the guide plate 42.
  • the stirring energy of the slag S that comes into contact with the guide plate 42 and is accommodated in the waste pan 30 is reduced as compared with the comparative example.
  • the slag S generated in the converter 20 is allowed to flow down from the converter 20 and stored in the slag pan 30 as compared with the case where the slag S generated in the converter 20 is stored as it is.
  • the forming of the slag S is easy to calm down.
  • the second effect is that the concave surface 42A of the guide plate 42 is inclined with respect to the vertical direction in a front view.
  • the recessed surface 42A of the guide plate 42 is disposed so as to be inclined with respect to the vertical direction when viewed from the front, as shown in FIGS.
  • the third function is that the distance L in the vertical direction from the upper end of the waste pan 30 to the lower end 42A2 of the guide plate 42 is within 1 m.
  • the slag S flowing down from the lower end 42 ⁇ / b> A ⁇ b> 2 of the guide plate 42 flows down into the discharge pan 30 with potential energy at the lower end 42 ⁇ / b> A ⁇ b> 2.
  • the potential energy at the lower end 42A2 is converted into stirring energy.
  • the forming of the slag S tends to be calmed down as the vertical separation distance L from the position where the slag S is separated from the guide plate 42 (the lower end 42A2) to the waste pan 30 is small. Therefore, according to the present embodiment, the forming of the slag S is easily subdued compared to the case where the vertical separation distance L from the upper end of the waste pan 30 to the lower end 42A2 of the guide plate 42 is greater than 1 m.
  • the fourth effect is that the slag S flowing down from the lower end 42A2 of the guide plate 42 is received and accommodated on the inner peripheral surface 34A of the slagging pan 30.
  • the forming of the slag S is more likely to be sedated as the vertical distance L from the position where the slag S is separated from the guide plate 42 (lower end 42A2) to the waste pan 30 is smaller.
  • the slag S flowing down from the lower end 42 ⁇ / b> A ⁇ b> 2 of the guide plate 42 is received by the inner peripheral surface 34 ⁇ / b> A of the waste pan 30 and accommodated in the waste pan 30.
  • the slag pan 30 is received by the inner peripheral surface 34 ⁇ / b> A. It is moved by the carriage 50 in advance. Therefore, according to this embodiment, the position of the waste pan 30 is easily adjusted so that the slag S is received by the inner peripheral surface 34A.
  • a part of the inner peripheral surface 34A is a receiving position (a position for receiving the slag S discharged from the converter 20).
  • the fifth effect is that the guide plate 42 has a bowl shape.
  • the guide plate 42 of the present embodiment has a bowl shape as shown in FIG.
  • the slag S that moves on the concave surface 42A of the guide plate 42 spreads in the depth direction with respect to the flow direction (the direction in which the slag S travels). hard. Therefore, according to the guide plate 42 of this embodiment, compared with the case where the shape of the guide plate 42 is a flat shape, the accommodation property is stabilized in the waste pan 30 (not easily spilled). Note that the first to third actions described above are also exhibited when the guide plate 42 is planar.
  • the sixth action is an action of having the adding portion 60, in other words, an action of adding the sedative material M to the slag S moving on the recessed surface 42 ⁇ / b> A of the guide plate 42.
  • the sedative material M is added to the slag S that is moving the guide plate 42 by the addition unit 60.
  • the sixth action will be described with reference to the drawings while comparing the present embodiment with the above-described comparative embodiment. In the description of the comparative embodiment, when the same components as those used in the present embodiment are used, the same reference numerals are given and detailed descriptions (including common actions) are omitted as appropriate.
  • the adding unit 60 adds the sedative material M toward the slag S in the slag pan 30. Therefore, in the case of a comparative form, the slag S before flowing down from the converter 20 and being accommodated in the slag pan 30 is accommodated in the slag pan 30 as originally formed (in the converter 20). Is done.
  • the slag S moving on the concave surface 42A of the guide plate 42 that is, the slag S before flowing down from the converter 20 and accommodated in the slag pan 30 is calmed down. Since the material M is added, the slag S and the sedative material M are mixed well and the forming sedation is likely to proceed. For this reason, the slag S accommodated in the waste pan 30 is accommodated in a state in which the forming is calmed down compared to the state in which the forming is originally performed (in the converter 20). In the case of the present embodiment, since the sedative material M flows down together with the slag S, the sedative material M is easily stirred in the waste pan 30 (accordingly, the sedative material M reacts in the waste pan 30). easy).
  • the forming of the slag S is easily subdued compared to the case where the soothing material M is not added to the slag S moving on the concave surface 42A of the guide plate 42.
  • the slag S generated in the converter 20 and moved in contact with the guide plate 42 flows down toward the bottom 32 of the discharge pan 30, It is accommodated in the waste pan 30.
  • the first modification has the same configuration as that of the present embodiment except for the above points.
  • the slag S flowing down from the guide plate 42 is not received by the inner peripheral surface 34 ⁇ / b> A of the discharge pan 30.
  • the above-described first to third, fifth and sixth actions are exhibited.
  • the lower end 42 ⁇ / b> A ⁇ b> 2 of the guide plate 42 is disposed in the slag pan 30.
  • the guide plate 42 is supported so as to be movable in the vertical direction (or the inclination direction of the guide plate 42) with respect to the support portion 44.
  • the guide plate 42 is moved upward when the level of the liquid surface of the slag S in the waste pan 30 reaches a predetermined height.
  • the second modification has the same configuration as that of the present embodiment except for the above points. In the case of the second modification, the above-described first to sixth actions are achieved.
  • the guide plate 42 has a bowl shape having a bent portion 42 ⁇ / b> B bent to the side where the support portion 44 is provided.
  • the slag S that has been received and moved at the first position 42A1 of the guide plate 42 flows down from the bent portion 42B toward the inside of the waste pan 30.
  • the bent portion 42B is an example of the second position.
  • the third modification has the same configuration as that of the present embodiment except for the above points. In the case of the third modification, the above-described first to sixth actions are achieved.
  • the guide plate 42 has a bowl shape having a bent portion 42 ⁇ / b> B bent to the side opposite to the side where the support portion 44 is provided.
  • the slag S that has been received and moved at the first position 42A1 of the guide plate 42 is changed in the moving direction at the bent portion 42B, and flows down from the lower end 42A2 into the discharge pan 30.
  • the lower end 42A2 is an example of a second position.
  • the fourth modification has the same configuration as that of the present embodiment except for the above points. In the case of the fourth modified example, the above-described first to sixth actions are exhibited.
  • the separation distance L in the fourth modification is shown smaller than the separation distance L in the present embodiment (FIG. 1) and other modifications (FIGS. 4, 6, and 9), Actually they are equivalent.
  • the surface 42 ⁇ / b> C of the guide plate 42 that contacts the slag S is curved so as to protrude toward the side on which the slag S contacts in front view.
  • the fifth modification has the same configuration as that of the present embodiment except for the above points.
  • the above-described first to sixth actions are exhibited.
  • the separation distance L in the fifth modification is illustrated larger than the separation distance L in the present embodiment (FIG. 1) and other modifications (FIGS. 4, 6, and 9). Are equivalent.
  • the guide plate 42 is configured such that its inclination angle ⁇ can be adjusted. And in the case of the 8th modification, even if the height of the liquid level of the slag S in the waste pan 30 becomes high during the period when the slag S is accommodated in the waste pan 30, the slag S is the inner peripheral surface.
  • the inclination angle ⁇ of the guide plate 42 is adjusted by the operator before the flow of the slag S from the converter 20 is started as received at 34A.
  • the eighth modification has the same configuration as that of the present embodiment except for the above points. In the case of the eighth modification, the above-described first to sixth actions are exhibited.
  • the conditions were set as much as possible to the extent that the influence on the evaluation due to variations in common conditions could be ignored, and the amount of slag S in the converter 20 after desiliconization and dephosphorization processing was about 20 t. It was. After desiliconization and dephosphorization, the converter 20 was tilted while the molten iron F was left in the converter 20, and the upper slag S was accommodated in the waste pan 30 arranged below from the furnace port (opening 22). While the slag S is flowing down, the operator manually controls the tilting operation of the converter 20 and the position of the carriage 50 while monitoring the sedation of the forming so that the slag S formed from the slag pan 30 does not overflow. It was.
  • the sedative material M introduced into the waste pan 30 is a mixture of papermaking sludge (not shown) that is an inexpensive organic pyrolysis substance and steelmaking slag (not shown) that is an inexpensive material for adjusting specific gravity.
  • the molded one was used.
  • the amount of the sedative material M to be added to the steelmaking slag was about 50 kg per one charging operation.
  • the amount of waste was measured with a weigher (not shown) placed on the carriage 50.
  • the waste time was defined as the time from the start of the tilting operation of the converter 20 for the flow of the slag S to the time when the molten iron F below the slag S flows out of the furnace port (opening 22). In this test, the greater the amount of evacuation and the shorter the evacuation time, the better the evacuation property.
  • Level 1 and level 2 are comparative examples, and the guide plate 42 is not arranged. Level 1 and level 2 are different from each other in the position where the slag S flows down to the discharge pan 30. In Level 2, the slag S hits the inner peripheral surface 34A of the upper wall on the side of the slag pan 30 (the slag S is received by the inner peripheral surface 34A). Level 2 was slightly better than level 1 in terms of exclusion.
  • Levels 3 to 9 are examples, and a guide plate 42 is disposed between the converter 20 and the discharge pan 30.
  • the guide plate 42 has a water cooling structure (a structure in which the guide plate 42 is cooled and the cooling water is circulated in a cavity formed in the guide plate 42) inside the guide plate 42. 2), and is linear in the flow-down direction (advancing direction of the slag S).
  • Levels 3 to 5 the inclination angle ⁇ of the guide plate 42 is different.
  • Levels 3 to 5 (Examples) have improved rejection compared to Levels 1 and 2 (Comparative Examples). This is presumably because, in the case of levels 3 to 5 (Example), the slag S flowing down from the converter 20 contacts the guide plate 42 and the energy is attenuated. That is, it can be said that the levels 3 to 5 have the first action described above.
  • the rejection is improved as the inclination angle ⁇ is increased. However, if the inclination angle is 10 ° or more, it can be said that there is no significant difference in the rejection. That is, it can be said that the levels 3 to 5 have the second action described above.
  • the addition amount of the sedative material M to the waste pan 30 was small compared with the comparative example.
  • Level 8 is an embodiment, and the slag S when the slag S is accommodated in the sewage pan 30 from the lower end 42A2 of the guide plate 42 hits the inner peripheral surface 34A of the upper side wall of the sewage pan 30 by the trolley 50.
  • the position of the waste pan 30 is adjusted by moving. It can be said that level 8 has improved rejection compared to level 6 where other conditions are equivalent. That is, it can be said that level 8 has the above-mentioned fourth action.
  • Level 9 is an example, and a sedative material M is added to the slag S moving in contact with the guide plate 42.
  • a sedative material M As the sedative material M, as in the sedative material M to be put into the waste pan 30, a mixed molding of paper sludge and steel slag is used, and a chute (addition part 60) disposed above the guide plate 42 is used. Then, 100 kg was continuously added to the moving slag. Compared with level 8 where other conditions are equivalent, level 9 has improved rejectability. That is, it can be said that level 9 has the above-mentioned sixth action. Moreover, compared with the level 8, the addition amount of the sedative material M to the inside of the squeezing pan 30 is small, and the addition amount of the total sedative material M is also low in the level 9.
  • Levels 3 to 9 have a shorter elimination time and an increased amount of elimination compared to levels 1 and 2 (comparative example). Further, the bulk volume of the slag S remaining in the converter 20 was almost the same regardless of the case of the example and the comparative example. However, the longer the discharge time, the longer the slag S in the converter 20 is. Forming subsides and bulk density increases. Since the weight of the slag S remaining in the converter 20 is obtained by multiplying the bulk volume and the bulk density of the slag S, the amount of the slag S remaining in the converter 20 decreases as the discharge time is shorter. The amount of excretion increases.
  • the embodiment is improved in the evacuation property because the sedation of the forming in the evacuation pan 30 is better than the comparative example.
  • the inclination of the guide plate 42, the vertical distance L between the lower end 42 ⁇ / b> A ⁇ b> 2 of the guide plate 42 and the upper end of the waste pan 30, the position where the slag S flows to the waste pan 30 (the slag S in the waste pan 30) can be said that the forming can be sedated more efficiently and the evacuation property can be improved by setting appropriate conditions such as the receiving position) and the addition of the sedative material M to the guide plate 42.
  • the waste in the above embodiment has been described as waste after desiliconization and dephosphorization in the converter 20
  • the waste method of the present disclosure is not limited to this.
  • the exhaust method of the present disclosure is also used when the converter 20 is tilted and discharged from the opening 22 (furnace port) after performing only one of desiliconization and dephosphorization in the converter 20. May be.
  • the exhaust method of the present disclosure may also be used when the converter 20 is tilted and exhausted from the opening 22 (furnace port) after performing only the decarburization process in the converter 20.
  • the guide plate 42 may have a water cooling structure as in the embodiment.
  • the guide plate 42 since the guide plate 42 has a water cooling structure, the guide plate 42 can be prevented from being damaged or deformed.
  • the slag S is cooled by the contact between the slag S and the guide plate 42, and the bubbles in the slag S are broken by the thermal shock to promote the calming of forming.
  • the surface of the guide plate 42 with which the slag S contacts may be uneven. By adopting the uneven shape, the energy is easily attenuated by the contact frictional resistance from the contact slag S.
  • the sedative material M has been described as being formed by mixing paper sludge, which is an inexpensive organic pyrolysis substance, and steelmaking slag, which is an inexpensive substance for adjusting specific gravity.
  • the sedative material is not limited to this, as long as it has a function of calming slag forming.
  • carbon materials coke powder, coal powder, graphite powder, etc.
  • a substance containing a thermally decomposable substance carbonate, organic substance, plastic, etc.
  • the guide plate 42 is supported by the support portion 44 in a state where the guide plate 42 is inclined 10 ° clockwise as an example in the vertical direction (inclination angle ⁇ is 10 °).
  • the inclination angle ⁇ may not be 10 °.
  • the inclination angle ⁇ is preferably 5 ° or more, and more preferably 10 ° or more.
  • the inclination angle ⁇ is preferably 20 ° or less, and more preferably 15 ° or less.
  • the waste pan 30 includes a circular bottom 32 as viewed from above, and a peripheral wall 34 having an inner peripheral surface 34 ⁇ / b> A whose inner diameter increases toward the upper side. It demonstrated as an inverted frustoconical container.
  • the shape of the waste pan may be different from the shape of the present embodiment.
  • the shape of the waste pan may be a cylindrical shape, a hemispherical shape, an inverted elliptical cone shape, or other shapes.
  • the inner surface 34B inner surface
  • the inner surface 34B has an arcuate cross section as in the waste pan 30A (an example of the pan) in FIG.
  • the inner peripheral surface 34C in the waste pan 30A is the top and bottom of the inner surface 34B.
  • the position of the inner surface 34B with respect to the reference is 20% or more and 100% or less.
  • the energy attenuating structure 10 has been described as including the guide unit 40, the carriage 50, and the addition unit 60. However, if the energy attenuating structure 10 is a configuration including at least the guide plate 42 and is configured to be able to accommodate the slag S in a state where the energy is attenuated after being discharged from the converter 20 in the waste pan 30, It does not need to include at least one or both of the adding unit 60 and the carriage 50. The same applies to the modification.
  • the contact member is fixed to a work floor provided on the side of the converter, The second position is located below the work floor, The exclusion method as described in (1).
  • the inclination angle of the contact member is 5 ° or more and 20 ° or less, The exclusion method according to (1) or (2).
  • the vertical distance from the upper end of the pan to the second position is within 1 m.
  • the slag is adjusted. Accommodate in the pan, The exclusion method as described in (5). (7) Adding a sedative to the slag moving the contact member; (1) The elimination method according to any one of (6). (8) (1) to (7) to discharge and cool the slag contained in the pan by the draining method according to any one of A method for producing slag.
  • the energy damping structure of the falling slag with (10) The contact member is arranged such that a vertical distance from the upper end of the pan to the second position is within 1 m. (10) The energy attenuation structure of the flowing-down slag as described above.
  • ⁇ 1> The slag generated by desiliconizing and dephosphorizing the hot metal in the converter is caused to flow down to a first position of a member disposed below the converter, Energy is attenuated by moving while contacting the member to a second position that is shifted from the first position in the lateral direction perpendicular to the up-down direction and below the first position. Flowing down the slag from the second position; The slag flowing down from the second position is accommodated in a pan disposed below the member. Exclusion method.
  • ⁇ 2> The vertical distance from the upper end of the pan to the second position is within 1 m, and the slag flowing down from the second position is accommodated in the pan.
  • ⁇ 3> The slag flowing down in contact with the member is received by the inner peripheral surface of the pan, and the slag is accommodated in the pan.
  • ⁇ 4> The slag is accommodated in the pan after adjusting the horizontal position of the pan and the posture of the member so that the slag flowing down in contact with the member is received by the inner peripheral surface of the pan. Let The exclusion method as described in ⁇ 3>.
  • ⁇ 5> Adding a sedative to the slag moving the member, and flowing the slag with the sedative added from the second position into the pan, The exclusion method according to any one of ⁇ 1> to ⁇ 4>.
  • ⁇ 6> ⁇ 1> to ⁇ 5>
  • the slag contained in the pan is discharged and cooled by the evacuation method according to any one of ⁇ 5>, A method for producing slag.
  • a contact member formed with a surface that contacts the slag that flows down from the converter and is accommodated in the pan, receives the slag that flows from the converter at the first position of the surface, and moves along the surface
  • a contact member that causes the slag to flow down into the pan from a second position that is shifted from the first position in a lateral direction perpendicular to the vertical direction and is lower than the first position;
  • the energy damping structure of the falling slag with ⁇ 8> The contact member is arranged such that a vertical distance from the upper end of the pan to the second position is within 1 m.
  • the energy attenuating structure of the downflow slag as described.
  • An addition part for adding a sedative to the slag moving along the surface, ⁇ 7> or ⁇ 8> comprising the energy attenuating structure according to ⁇ 8>.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)

Abstract

Ce procédé d'élimination de scories comprend les étapes suivantes : basculement d'un convertisseur après au moins un procédé de désiliconisation, déphosphoration et décarburation dans le convertisseur afin de permettre à une couche supérieure de scories expansées de s'écouler vers le bas depuis une ouverture du convertisseur jusqu'à une première position d'un élément de contact tout en permettant au fer fondu de rester dans le convertisseur ; déplacement des scories en contact avec l'élément de contact depuis la première position vers une seconde position qui est déviée de la première position dans la direction transversale perpendiculaire à la direction verticale et située en dessous de la première position, et provoquant l'écoulement vers le bas des scories depuis la seconde position ; et logement des scories s'écoulant vers le bas depuis la seconde position dans un pot disposé au-dessous du convertisseur.
PCT/JP2017/001784 2016-01-28 2017-01-19 Procédé d'élimination de scories, procédé de production de scories, et structure d'amortissement d'énergie de chute de scorie WO2017130837A1 (fr)

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JP2017564203A JP6589998B2 (ja) 2016-01-28 2017-01-19 排滓方法、スラグの製造方法及び流下スラグのエネルギー減衰構造
CN201780002581.4A CN107849626B (zh) 2016-01-28 2017-01-19 排渣方法、炉渣的制造方法及流下炉渣的能量衰减结构
KR1020187002598A KR20180019745A (ko) 2016-01-28 2017-01-19 배재 방법, 슬래그의 제조 방법 및 유하 슬래그의 에너지 감쇠 구조

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CN110592310A (zh) * 2019-09-04 2019-12-20 北京首钢国际工程技术有限公司 一种转炉炉下活动挡渣板装置

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JP4580435B2 (ja) * 2008-05-27 2010-11-10 新日本製鐵株式会社 排滓鍋スラグのフォーミング鎮静材及びその鎮静方法
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CN107849626B (zh) 2020-02-21

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