JP6650020B2 - Hot metal processing equipment - Google Patents

Description

  The present invention relates to a hot metal processing method and a hot metal processing apparatus.

  Slag (slag) from which mineral components are separated is generated in the hot metal that is tapped from the blast furnace. Such slag is removed from the hot metal by scraping the slag out of the hot metal pot with a dragger. The slag separated from the hot metal can reuse an unreacted component as a raw material for steelmaking, or can be used for, for example, a raw material for roadbed materials.

  Since hot metal contains impurities such as sulfur, silicon, and phosphorus that degrade the properties of steel materials, pretreatment for removing impurities to the impurity concentration required for the steel materials is performed. Generally, in such pretreatment, impurities are combined with mineral components such as calcium and fixed in slag, and the slag is scraped out of a hot metal pot with a dragger to reduce impurities. Above all, desulfurization treatment for removing sulfur from hot metal is widely performed.

  Usually, in the desulfurization treatment, a desulfurizing agent such as CaO (calcium oxide) is charged into hot metal, and sulfur in molten steel is reacted with a mineral component to form a compound such as CaS (calcium sulfide) to form a slag. Fix inside and remove slag to remove sulfur from hot metal. As described above, the slag generated by the desulfurization treatment contains sulfur, but in other steps of the hot metal treatment, slag having a different component is generated and removed and recovered in each step. It is desired to sort and collect such different types of slag to select an optimal use method according to the composition of each slag and the like.

  Therefore, a slag removal device (dragger) for scraping slag from a hot metal pot, and a slag receiver (hopper) for temporarily receiving the slag scraped by the slag removal device and dropping it into a slag spot for collecting slag are provided. Remove the slag from the hot metal pot by moving the hot metal pot to any one of the multiple slag recovery positions facing the slag pot, and moving the slag removal device and slag receiver to the position corresponding to the slag recovery position where the hot metal pot is placed Further, a hot metal slag recovery facility for recovery has been proposed (see JP-A-2002-146413).

  Since the hot metal slag recovery equipment disclosed in the above publication is configured to move the hot metal pot to a different slag removal position according to the type of slag, slag before treatment before desulfurization treatment, and after treatment caused by desulfurization treatment When separating and recovering slag, it is necessary to move the hot metal pot before and after the desulfurization treatment. However, such a movement of the hot metal pot has a disadvantage that the cycle time of the hot metal processing becomes long.

JP 2002-146413 A

  In view of the above disadvantages, an object of the present invention is to provide a hot metal processing method and a hot metal processing apparatus having a relatively short cycle time.

  The invention made in order to solve the above-mentioned problem is a hot metal treatment method for performing desulfurization treatment of hot metal and separating and collecting slag, wherein before the desulfurization treatment, a hot metal pot at a reference position for performing desulfurization treatment is processed into a slag chute. A step of scraping out the pre-slag, a desulfurization processing step of adding a desulfurizing agent to the hot metal pot at the reference position and stirring the hot metal, and a step of moving the slag chute to a discharge position to the pre-processing slag pit, Discharging the pre-treatment slag from the slag chute to the pre-treatment slag pit, returning the slag chute to the slag receiving position from the hot metal pot at the reference position, and after the desulfurization treatment, the hot metal pot at the reference position Scraping the slag after treatment from the slag chute to the slag chute; moving the slag chute to a discharge position to the slag pit after treatment; A hot metal processing method characterized by comprising the step of discharging the processed slag processed slag pits from the chute.

  The hot metal processing method moves the slag chute to the discharge position to the slag pit before processing, discharges the slag before processing to the slag pit before processing, and returns the slag chute to the slag receiving position from the hot metal pot at the reference position. Therefore, it is not necessary to move the hot metal pot from a predetermined reference position. For this reason, the hot metal processing method can shorten the waiting time between the scraping of the slag before the treatment, the desulfurization treatment, and the scraping of the slag after the treatment, so that the cycle time of the hot metal treatment can be relatively shortened.

  Another invention made in order to solve the above problems is a hot metal processing apparatus for desulfurizing hot metal and separating and recovering hot metal slag, the hot metal pot storing hot metal, and the hot metal pot at a reference position. A desulfurization mechanism for charging the desulfurizing agent and stirring the hot metal, a dragger for scraping slag of the hot metal surface from the hot metal pot at the reference position, a slag chute for receiving the slag scraped by the dragger, and discharging slag from the slag chute. A plurality of slag pits, and the slag chute is configured to be movable between a receiving position for receiving slag from the hot metal pot at the reference position and a plurality of discharge positions for discharging slag to the slag pit. It is a hot metal processing apparatus characterized by the above.

  The hot metal processing apparatus can scrape out slag before treatment, desulfurization treatment, and scrape out slag after treatment without moving the hot metal pot while keeping the hot metal pot at the reference position. Since the slag chute can be moved during the desulfurization treatment and the slag before treatment can be discharged to the slag pit, the hot metal treatment apparatus can wait for the slag before treatment, desulfurization treatment, and scraping of slag after treatment. By reducing the time, the cycle time of the hot metal treatment can be relatively shortened.

  As described above, the hot metal processing method and the hot metal processing apparatus of the present invention can make the cycle time of hot metal processing relatively short.

FIG. 1 is a schematic plan view illustrating a hot metal processing apparatus according to an embodiment of the present invention. FIG. 2 is a schematic side view of the hot metal processing apparatus of FIG. 1. 2 is a flowchart showing a procedure of a hot metal processing method using the hot metal processing apparatus of FIG. 1.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings as appropriate.

[Hot metal processing equipment]
The hot metal processing apparatus according to one embodiment of the present invention shown in FIGS. 1 and 2 is an apparatus that performs desulfurization processing of hot metal and separate recovery of hot metal slag.

  The hot metal processing apparatus stores hot metal and can be disposed at a predetermined reference position Ps for performing desulfurization processing, and a hot metal pot 1 at the reference position Ps for the desulfurization processing. A desulfurization mechanism 2 for stirring the hot metal, a dragger 3 for scraping slag of the hot metal surface from the hot metal pot 1 at the reference position Ps, a slag chute 4 for receiving the slag scraped by the dragger 3, and slag from the slag chute 4 A plurality of slag pits to be discharged (a slag pit 5a before treatment and a slag pit 5b after treatment) are provided.

  The hot metal to be treated by the hot metal treating apparatus is not particularly limited, but for example, has a carbon (C) content of 4% by mass or more and 4.5% by mass or less, a sulfur (S) content of 0.01% by mass or less, and temperature. Can be 1200 ° C. or higher and 1400 ° C. or lower.

<Hot Iron Pot>
The hot metal pot 1 is a container having at least an inner wall surface formed of a refractory material and having an upper opening, and is used for storing and transporting hot metal discharged from a blast furnace or the like. A known configuration can be used as the hot metal pot 1.

  The capacity of the hot metal ladle 1 is not particularly limited, but can be, for example, 220 to 280 t in terms of the mass of the hot metal. As a specific example, the dimensions of the hot metal ladle 1 can be 3 m or more and 5 m or less, and the height is 5 m or more and 7 m or less.

  Further, the hot metal pot 1 is moved by a crane device 6 provided above a building where the hot metal processing apparatus is disposed. Further, the hot metal pot 1 can be supported by a pot tilting mechanism 7 disposed at a predetermined reference position Ps where desulfurization processing can be performed by a desulfurization mechanism 2 described below.

  The crane device 6 is provided between a pair of transport rails 8 arranged to extend in the horizontal X direction, and extends in the Y direction perpendicular to the X direction and horizontally between the transport rails 8. A transport beam 9 movable along the rail 8 and a hoist block provided to be movable along the transport beam 9 and having one or a plurality of chains capable of suspending the hot metal pot 1 and of which the suspension length is adjustable. And 10. Each of the components of the crane device 6 may have a known configuration.

  The pan tilting mechanism 7 supports the hot metal pot 1 so as to be swingable about an axis in the X direction so that the upper opening of the hot metal pot 1 can be tilted in the Y direction. The tilting of the hot metal ladle 1 in the Y direction by the pan tilting mechanism 7 makes it easy for the hot metal ladle 1 to scrape out slag by the dragger 3 described later. As such a pan tilting mechanism 7, a known configuration can be used.

<Desulfurization mechanism>
The desulfurization mechanism 2 is configured to charge the hot metal pot 1 at the reference position Ps with a desulfurizing agent and a slagging agent and to stir the hot metal. Specifically, the desulfurization mechanism 2 includes a desulfurizing agent charging device 11 for charging a desulfurizing agent and a slagging agent, and an impeller 12 inserted into the hot metal and stirring the hot metal. The desulfurization mechanism 2 is held by a frame 14 that can run on a desulfurization mechanism rail 13 laid on the floor so as to extend in the X direction so as to be able to move up and down in the vertical direction (Z direction). As the desulfurization mechanism 2 held by such a frame 14, a mobile mechanical stirring desulfurization facility having a known configuration can be used.

  The moving speed of the frame 14 holding the desulfurization mechanism 2 is not particularly limited, but may be, for example, 15 m / min or more and 30 m / min or less, and typically 20 m / min.

  As the desulfurizing agent, for example, lime (CaO) can be used, and as the slagging agent, for example, aluminum dross (aluminum oxide) can be used. The input amount of the desulfurizing agent per 1 t of hot metal can be, for example, not less than 4 kg / t and not more than 8 kg / t. Further, the amount of the slagging agent to be charged per ton of hot metal can be, for example, 0.4 kg / t or more and 1.6 kg / t or less.

The shape of the impeller 12 may be a substantially square plate-like blade arranged radially in a plan view around an axis. Although the dimensions of the impeller 12 depend on the size of the hot metal pot 1, for example, the outer diameter is 1.4 m, the height is 0.8 m, the blade thickness is 0.25 m, and the number of blades is four. Further, as a material of the impeller 12, for example, Al ₂ O ₃ —SiO ₂ —SiC can be used.

  The rotation speed of the impeller 12 depends on the shape of the impeller 12 and the like, but can be, for example, 120 rpm or more and 150 rpm or less. The stirring time of the hot metal by the impeller 12 after the addition of the desulfurizing agent and the slagging agent can be, for example, 8 minutes or more and 15 minutes or less.

  By adding the desulfurizing agent and the slagging agent and stirring the hot metal, sulfur (S) in the hot metal reacts with the desulfurizing agent to generate calcium sulfide (CaS). By fixing the calcium sulfide in the slag, the sulfur in the hot metal is removed. Slag generated by this desulfurization treatment and containing sulfur is referred to as post-treatment slag. On the other hand, the slag generated before the desulfurization treatment is referred to as a pre-treatment slag, and is collected separately from the post-treatment slag in the hot metal treating apparatus as described later.

<Dragger>
The dragger 3 has a scraping arm 15 for scraping slag floating on the surface of the hot metal stored in the hot metal pot 1 arranged at the reference position Ps, that is, the hot metal pot 1 supported by the hot metal tilting mechanism 7. When the dragger 3 scrapes out the slag, the pan tilting mechanism 7 promotes the scraping of the slag by tilting the upper opening of the hot metal pot 1 toward the dragger 3.

  The dragger 3 may have a telescopic mechanism or an indirect mechanism for reciprocating the scraping arm 15 on the surface of the hot metal at a speed of, for example, 400 mm / sec. Further, the reciprocating direction of the scraping arm 15 may be configured so as to be inclined about 10 ° to both sides in the X direction with respect to the Y direction so as to cover the entire surface of the hot metal ladle 1. Further, the height of the entire dragger 3 or the tip of the scraping arm 15 of the dragger 3 may be adjusted in the Z direction in accordance with the height of the molten metal surface in the hot metal ladle 1. A known configuration can be used as the dragger 3.

  The dragger 3 is disposed on a gantry 16 installed at a position facing the pan tilting mechanism 7 in the Y direction. The dragger 3 retreats the scraping arm 15 except when scraping out the slag, so as to avoid interference with the desulfurization mechanism 2 particularly during desulfurization processing. In addition, the dragger 3 may be disposed so as to be able to advance and retreat in the Y direction so that the dragger 3 can be entirely accommodated inside the gantry 16.

<Slag chute>
The slag chute 4 is a hopper that receives slag scraped from the hot metal pot 1 by the dragger 3 and discharges the slag to slag pits 5a and 5b described later.

The volume of the slag chute 4 is preferably set so as to accept the entire amount of slag discharged in one slag scraping step described later, and may be, for example, 3 m ³ or more and 8 m ³ or less, and is typical. Can be 5 m ³ . In addition, since the slag can be piled up on the slag chute 4, the slag having a larger volume than the above-mentioned volume can be held. As a specific example, the slag chute 4 may be capable of receiving about 6.7 m ³ of slag even when the volume is 5 m ³ .

  The slag chute 4 is supported by a chute moving cart 18 movable in the X direction along a chute rail 17 laid on the floor so as to extend in the X direction parallel to the desulfurization mechanism rail 13, The slag is discharged by tilting on 18.

  More specifically, the slag chute 4 discharges slag to a receiving position Pr (a position facing the reference position Ps in the Y direction) from the hot metal ladle 1 at the reference position Ps and a plurality of slag pits 5a and 5b to be described later. Between a plurality of discharge positions Pa and Pb (positions directly facing the slag pits 5a and 5b in the Y direction).

  The chute moving carriage 18 can be configured to move on the chute rail 17 by, for example, an electric motor, and to tilt the slag chute 4 about an axis in the X direction by, for example, a tilt mechanism using a hydraulic cylinder.

  The moving speed of the chute moving cart 18 is not particularly limited, but may be, for example, 5 m / min or more and 20 m / min or less, typically 10 m / min. The tilting speed of the slag chute 4 by the chute moving cart 18 is not particularly limited, but may be, for example, 90 ° / min or more and 360 ° / min or less, typically 180 ° / min.

  The tilt angle of the slag chute 4 by the chute moving cart 18 may be any angle at which the slag can be completely discharged from the slag chute 4, and is, for example, 60 ° or more and 120 ° or less, typically 90 °. Can be.

<Slag pit>
The plurality of slag pits include a pre-treatment slag pit 5a for receiving, from the slag chute 4, pre-treatment slag scraped from the hot metal pot 1 by the dragger 3 before the desulfurization treatment, and a hot metal by the dragger 3 after the desulfurization treatment. And a post-processing slag pit 5b which receives the post-processing slag discharged from the pan 1 from the slag chute 4 and temporarily stores it.

  These slag pits 5a and 5b are arranged along the chute rail 17 in the X direction on the opposite side of the chute rail 17 from the pan tilting mechanism 7.

  The slag pits 5a and 5b are formed of three walls (a back wall and both side walls) provided on a rectangular floor formed of refractory material and three side edges of the floor except for a side edge of the floor opposite to the chute rail 17. ) To deposit slag. The slag deposited in the slag pits 5a, 5b is carried out by reloading it on a transport device (not shown) such as a trolley using a heavy equipment (not shown) such as a bulldozer or an excavator.

  The size of the slag pits 5a and 5b may be selected according to the slag carrying capacity or the like. For example, the floor surface width is 4m or more and 6m or less, the depth is 2m or more and 3m or less, and the wall height is 1m or more and 3m or less. It can be. Further, the floor surfaces of the slag pits 5a and 5b may be inclined so as to descend toward the back wall.

[Hot metal processing method]
A hot metal processing method according to another embodiment of the present invention shown in FIG. 3 is a method for performing desulfurization processing of hot metal and separating and collecting slag, and can be performed using the above-described hot metal processing apparatus.

  In the hot metal processing method, the hot metal ladle 1 for storing hot metal is disposed at the reference position Ps, and the slag chute 4 is disposed at the slag receiving position Pr (step S1: arranging step). A step of scraping the slag before treatment from the hot metal pot 1 at the reference position Ps to the slag chute 4 (step S2: a slag scraping step before treatment), and a desulfurizing mechanism 2 for supplying a desulfurizing agent to the hot metal pot 1 at the reference position Ps. Step of moving the slag chute 4 to the discharge position Pa to the slag pit 5a before processing (Step S4: first moving step) in parallel with the step of stirring the hot metal (Step S3: desulfurization processing step) and the desulfurization processing step ), A step of discharging the pre-treatment slag from the slag chute 4 to the pre-treatment slag pit 5a (step S5: first discharge step); A step of returning the Ps to the slag receiving position Pr from the hot metal pot (Step S6: return step), and a step of scraping the processed slag from the hot metal pot 1 at the reference position Ps to the slag chute 4 by the dragger 3 after the desulfurization process (Step S6). S7: Post-processing slag scraping step), moving the slag chute 4 to the discharge position Pb to the post-processing slag pit 5b (Step S8: second moving step), and moving from the slag chute 4 to the post-processing slag pit 5b. Discharging the post-treatment slag (step S9, second discharging step).

<Placement process>
In the arrangement step of step S1, the hot metal pot 1 is arranged at the reference position Ps, that is, the hot metal pot 1 is held by the pan tilting mechanism 7, and the slag chute 4 is arranged at the receiving position Pr directly opposite to the reference position Ps. At this time, the hot metal ladle 1 is oriented so that its crow mouth faces the dragger 3. In addition, this arrangement | positioning process should just confirm that the hot metal pot 1 and the slag chute 4 are arrange | positioned at the reference position Ps and the receiving position Pr, and may not necessarily accompany the movement of the hot metal pot 1 and the slag chute 4.

<Slag scraping process before treatment>
In the pre-treatment slag scraping step of step S2, first, the hot metal ladle 1 is tilted toward the slag chute 4 by the pan tilting mechanism 7 to such an extent that the molten metal surface becomes close to the slag. Subsequently, the dragger 3 is protruded toward the hot metal pot 1, and the slag (slag before treatment) on the hot metal surface is scraped out of the hot metal pot 1 by the dragger 3 and discharged onto the slag chute 4. After that, the opening direction of the hot metal pot 1 is returned to the vertical direction by the pot tilting mechanism 7.

  The tilt angle of the hot metal pot 1 is selected according to the shape of the hot metal pot and the amount of hot metal, and may be, for example, 38 ° or more and 42 ° or less. The time for scraping out the slag before treatment, that is, the operating time of the dragger 3 is selected according to the size of the hot metal ladle 1, the amount of slag to be scraped, and the like. Can be. In addition, it is preferable that the pre-treatment slag scraping step is performed until the exposed area ratio of the molten metal surface of the hot metal becomes 60% or more and 80% or less.

The pre-treatment slag discharged from the hot metal ladle 1 in the pre-treatment slag scraping step is generated before the desulfurization treatment, and may be, for example, blast furnace slag, desiliconization slag, or the like. As the components of the slag before the treatment, for example, the content of CaO is 20% by mass or more and 40% by mass or less, the content of SiO ₂ is 20% by mass or more and 40% by mass or less, and the content of Fe is 5% by mass or more and 15% by mass. Hereinafter, the basicity (mass ratio of CaO to SiO ₂ ) is 0.5 or more and 1.5 or less. Further, the discharge amount of slag before treatment per ton of hot metal depends on, for example, the processing of hot metal before being subjected to the hot metal processing method, but is, for example, 4 kg / t or more and 8 kg / t or less.

Basicity from molten pig iron by pretreatment slag scooping process is relatively small, by removing the large pretreatment slag content of SiO _2, it can be removed SiO ₂ in the hot metal. Thus, the SiO ₂ to generate 2CaO · SiO ₂ reacts with desulfurizing agent (CaO) in the subsequent desulfurization step, i.e. to prevent the SiO ₂ prevents desulfurization consumes desulfurizing agent, the desulfurization rate Can be improved.

<Desulfurization process>
The desulfurization processing step in step S3 includes a step of disposing the desulfurization mechanism 2 on the hot metal ladle 1 (desulfurization mechanism arrangement step) and a step of inputting a desulfurizing agent and a slagging agent to the hot metal by the desulfurizing agent input device 11 (input step). ), A step of stirring the hot metal by the impeller 12 (stirring step), and a step of detaching the desulfurization mechanism 2 upward from the hot metal pot 1 (desulfurization mechanism detachment step).

(Desulfurization mechanism arrangement step)
In the desulfurization mechanism arranging step, first, the desulfurization mechanism 2 is arranged above the hot metal ladle 1 by moving the frame 14 along the desulfurization mechanism rail 13, and then the impeller 12 is lowered by lowering the desulfurization mechanism 2. Is inserted into the hot metal of the hot metal ladle 1 so that desulfurization processing can be performed.

(Input process)
In the charging step, a desulfurizing agent and a slagging agent are charged into the hot metal of the hot metal ladle 1 using the desulfurizing agent charging device 11. The types of the hot metal desulfurizing agent and the slagging agent and the amounts thereof are as described above.

(Stirring process)
In the stirring step, the hot metal is stirred by the impeller 12 to react the desulfurizing agent and the slagging agent, thereby fixing the sulfur in the hot metal to the slag. The stirring speed and the stirring time of the hot metal are as described above.

(Desulfurization mechanism desorption process)
In the desulfurization mechanism desorption step, first, the desulfurization mechanism 2 is raised to pull out the impeller 12 from the hot metal ladle 1, and then the frame 14 is moved along the desulfurization mechanism rail 13 to thereby move the desulfurization mechanism 2 to the hot metal ladle 1. From the tube.

<First movement process>
The first moving step in step S4 is performed in parallel with the above desulfurization processing step. In the first moving step, the chute moving carriage 18 is moved along the chute rail 17 so that the slag chute 4 holding the slag scraped out in the slag scraping step before treatment is correctly inserted into the slag pit 5a before treatment. To the first discharge position Pa.

<First discharge process>
The first discharge step in step S5 is performed in parallel with the desulfurization processing step. In the first discharge step, first, the slag chute 4 is tilted toward the pre-treatment slag pit 5a to discharge the pre-treatment slag from the slag chute 4 to the pre-treatment slag pit 5a. Subsequently, the inclination of the slag chute 4 is returned to the original state so that the slag can be held again.

<Return process>
The return step of step S6 is performed in parallel with the above desulfurization processing step. In this return step, the slag chute 4 is rearranged to the receiving position Pr by moving the chute moving cart 18 along the chute rail 17.

<Slag scraping process after treatment>
The post-processing slag scraping step in step S7 is performed after confirming that all the processing from step S3 to step S6 has been completed. In addition, usually, of these processes, the desulfurization process in step S3 ends at the latest.

  In the post-treatment slag scraping step, first, the hot metal ladle 1 is tilted toward the slag chute 4 by the pan tilting mechanism 7. Subsequently, the dragger 3 is protruded toward the hot metal pot 1, and slag (slag after treatment) on the hot metal surface is scraped out of the hot metal pot 1 by the dragger 3 and discharged onto the slag chute 4. After that, the opening direction of the hot metal pot 1 is returned to the vertical direction by the pot tilting mechanism 7.

In the post-treatment slag scraping step, the post-treatment slag containing CaS is discharged as described above. As the components of the slag after the treatment, for example, the content of CaO is 40% by mass or more and 60% by mass or less, the content of SiO ₂ is 10% by mass or more and 20% by mass or less, and the content of Al ₂ O ₃ is 10% by mass or more. The content of S is 20% by mass or less, and the content of S is 1% by mass or more and 2% by mass or less. In addition, the discharge amount of the slag before treatment per ton of hot metal in the slag scraping process after treatment is, for example, 4 kg / t or more and 8 kg / t or less.

<Second transfer step>
In the second movement step of step S8, the chute moving carriage 18 is moved along the chute rail 17 so that the slag chute 4 holding the untreated slag scraped out in the after-treatment slag scraping step allows the slag pit 5b to be treated. Is positioned at the first discharge position Pb directly opposite to.

<Second discharge process>
In the second discharge step of step S9, first, the slag chute 4 is tilted toward the post-processing slag pit 5b to discharge the post-processing slag from the slag chute 4 to the post-processing slag pit 5b. Subsequently, the inclination of the slag chute 4 is restored.

  The hot metal processing method may further include, after the second discharging step, a step of relocating the slag chute 4 to the receiving position Pr by moving the chute moving cart 18 along the chute rail 17.

  Further, the hot metal processing method includes a step of carrying out the untreated slag discharged into the untreated slag pit 5a, a step of removing the ingot from the unloaded slag, and a step of removing the untreated slag from the base material. And a step of using it as a material.

  In the metal removal step, metal and slag may be separated using, for example, a magnetic separator. In addition, the ingot separated from the slag can be used as a raw material in a steelmaking process.

  Further, the hot metal treatment method includes a step of carrying out the treated slag discharged to the treated slag pit 5b, a step of classifying the carried out treated slag, and a step of using the classified treated slag in the steelmaking step. It is preferable to provide

  In the classification step, for example, the slag after treatment is classified using a sieve having an average opening of 100 mm, and the slag that has passed through the sieve is classified again using a sieve having an average opening of 15 mm. Classify to particle size. The treated slag having a passage opening of 100 mm or more can be used as an iron source in a converter or a dephosphorizing agent to be charged into a dephosphorizing furnace. The treated slag having a passage opening of less than 100 mm and 15 mm or more can be used as an iron source in a converter or a desulfurizing agent to be charged in a desulfurization step. The treated slag having a passage opening of less than 15 mm can be used as a raw material for producing a sintered material.

<Advantages>
According to the hot metal processing method using the hot metal processing apparatus, the slag chute 4 is moved independently of the hot metal ladle 1 and the dragger 3 in parallel with the desulfurization processing step, and the first moving step, the first discharging step, and Since the return process is performed, the pre-treatment slag and the post-treatment slag can be separated and collected into the pre-treatment slag pit 5a and the post-treatment slag pit 5b without moving the hot metal ladle 1. Accordingly, the pretreatment slag scraping step, the desulfurization treatment step, and the post-treatment slag scraping step can be continuously performed without waiting time while the hot metal pot 1 is held by the pan tilting mechanism 7 at the reference position Ps. In addition, the cycle time of the hot metal treatment can be relatively shortened.

  It is assumed that the hot metal ladle 1 is disposed at a position directly opposite to the pre-treatment slag pit 5a, the pre-treatment slag is discharged, the hot metal ladle 1 is moved to a reference position, desulfurization is performed, and the hot metal ladle 1 is processed and the slag pit 5b is processed. It is considered that if the slag is discharged after being moved to a position directly facing the hot metal ladle, the hot metal ladle 1 needs to be moved twice, and about 5 minutes is required for each movement of the hot metal ladle 1. That is, according to the hot metal processing method, it is considered that the cycle time of the hot metal processing can be shortened by about 10 minutes in total as compared with the conventional hot metal processing method.

[Other Embodiments]
The above embodiments do not limit the configuration of the present invention. Therefore, in the above embodiment, it is possible to omit, replace, or add the components of each part of the embodiment based on the description of the present specification and common technical knowledge, and all of them are interpreted as belonging to the scope of the present invention. Should.

  In the hot metal processing apparatus, as a mechanism for transporting the hot metal pot to the reference position, for example, a transport trolley or the like can be used other than the crane apparatus. The mechanism for transporting such a hot metal pot is not supposed to transfer the hot metal pot to the hot metal tilting mechanism disposed at the reference position, and may itself have the hot metal tilting mechanism.

  Further, a plurality of the hot metal processing apparatuses may be provided for one hot metal ladle conveying mechanism. When a plurality of the hot metal processing apparatuses are provided, the slag pit before the treatment and the slag pit after the processing may be shared among the plurality of the hot metal processing apparatuses.

  Further, in the hot metal processing apparatus, as a configuration for guiding the movement of the slag chute, an arbitrary configuration such as a groove formed on the floor other than the rail laid on the floor surface can be adopted.

  The hot metal used in the hot metal processing method may be not only hot metal discharged from the blast furnace, but also hot metal discharged from the blast furnace subjected to a treatment such as a desiliconization treatment or a dephosphorization treatment.

  INDUSTRIAL APPLICABILITY The hot metal processing apparatus and hot metal processing method of the present invention can be widely applied to hot metal processing for desulfurization.

DESCRIPTION OF SYMBOLS 1 Hot metal pot 2 Desulfurization mechanism 3 Dragger 4 Slag chute 5a Slag pit 5b before treatment Slag pit 6 after treatment Crane device 7 Pot tilting mechanism 8 Transport rail 9 Transport beam 10 Hoist block 11 Desulfurizer input device 12 Impeller 13 Rail for desulfurization mechanism 14 Frame 15 Raising arm 16 Mount 17 Rail for chute 18 Chute moving cart Pa, Pb Discharge position Pr Receiving position Ps Reference position

Claims (1)

A hot metal treatment apparatus for separating and recovering slag from desulfurization treatment of hot metal and slag before desulfurization treatment and slag after desulfurization treatment used in a sintered material and a steelmaking process,
A hot metal ladle for storing hot metal,
A desulfurization mechanism for charging a hot metal ladle at a reference position with a desulfurizing agent and stirring hot metal,
A dragger that scrapes slag on the hot metal surface from the hot metal pot at the reference position,
One slag chute that receives the slag scraped by the dragger,
A plurality of slag pits from which slag is discharged from the slag chute,
The hot metal processing apparatus, wherein the slag chute is configured to be movable between a receiving position for receiving slag from the hot metal pot at the reference position and a plurality of discharging positions for discharging slag to a slag pit.

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