JPS6156218A - Method for operating mixer car and its equipment - Google Patents

Abstract

PURPOSE:To improve a transportating efficiency with an increased amount of a mixer car by sweeping adhered residue near an opening part of the mixer car into the mixer car before sweepoing out the residual molten metal with the mixer car inclined. CONSTITUTION:At the completion of the operating cycle of the mixer car 1, a ressual 8 adhered near the opening part of the mixer car 1 is sweeping into the mixer car 1. Thereafter, a molten metal pot 12 previously heated is moved to the below part of the mixer car 1, and a residual molten metal 11 swept from the mixer car 1 is temporarily received on the pot 12 to continue the heating of the pot 12. In addition, the residual molten metal 11 heated inside after the pot 12 is held up is returned into the mixer car 1 returned at the vertical position to mix with the received metal in the mixer car in the next cycle.

Description

Detailed Description of the Invention (Industrial Application Field) A torpedo car, or a pig iron mixer car, is used to transport hot metal from a blast furnace factory to a steelmaking factory. Proper disposal of hot metal and residues is important as follows.

In recent years, hot metal pretreatment technology has been developed that performs out-of-furnace treatments such as desulfurization, desiliconization, and dephosphorization inside the pig iron car, and desulfurization is now a process in many steel mills.

This process is carried out by blowing flux (powder of carbide, burnt lime, soda ash, etc.) into the hot metal in the pig iron mixing car together with a carrier gas.

However, during this pre-treatment process, slag and metal adhere to the area around and inside the opening of the pig iron mixer car, resulting in a so-called junk state, and this junk becomes a weir and prevents the discharge of hot metal from inside the pig iron mixer car. This is because residual molten pig iron is generated, and emptiness inside the pig iron mixer car reduces the effective internal volume of the pig iron mixer car, resulting in a reduction in the amount of pig iron received, which impedes the transport efficiency of the pig iron mixer car.

(Prior art) As a countermeasure against the above problem, for example, a movable slag breaker equipped with a scraping blade at the end of the arm is used to remove the slag from the opening of the pig iron mixer by breaking it with the scraping blade. Ta. However, the scraps fall into the inside of the pig iron mixer car, so in order to discharge the scraps, the pig iron mixer car must be tilted 180' so that the opening faces straight down, but the hot metal from the pig iron mixer car's inner frame is also discharged together.

If water seeps into the ballast of the dispensing pit at this time, there is a risk of a steam explosion due to the high temperature reaction.

Therefore, a method was devised to first receive the residual hot metal in a container and then receive the slag in another container (Japanese Patent Application Laid-Open No. 53-1.233
Publication No. 10). In this conventional technology, the remaining hot pig iron is cooled in a container, so the remaining hot pig iron is turned into cold pig iron and treated as so-called rough pig iron, which lowers the evaluation value as pig iron, and furthermore, when rough pig iron is generated multiple times. It becomes difficult to know how to deal with it.

(Problems to be Solved by the Invention) This invention solves the problem of processing residual hot pig iron without generating rough pig iron, which could not be achieved with the above-mentioned conventional techniques, and removing deposits from the openings and inside of the pig iron mixer. The purpose is to establish a method to do so.

(Means for Solving the Problems) In order to achieve the above object, the present invention first deals with the residue mainly consisting of slag and residual hot metal remaining in the pig iron mixing car after discharging the loaded hot metal. Pig iron mixer in which the remaining molten pig iron is discharged in a tilted position of the pig iron mixer at an angle that allows selective discharge, and then the molten pig iron in the pig iron mixer is discharged by further rotating the pig iron mixer further, or by rotating or rocking the pig iron mixer. At the end of the operating cycle of a car, before discharging the residual hot metal, scrape off the residue deposits near the dispensing opening of the pig iron mixer car into the pig iron mixer car, and transfer the residual hot pig iron discharged from the pig iron mixer car to the hot metal pot under heating. After temporarily receiving the molten pig iron, heating is continued while the slag is scraped off and the slag is discharged together with the slag, and the heated residual molten pig iron is then returned to the mixer car which has returned to an upright position and the remaining hot pig iron is returned to the mixer car in the next cycle. It consists of a combination of receiving pig iron and mixed use.

In addition, the equipment directly used to carry out the operation method described in ``2'' shall be provided with a frame that straddles the track near the end of the running track of the mixed pig iron car at a height that exceeds the vehicle limit, and on this frame, the track of the mixed pig iron car is A slag breaker with an arm that can move forward and backward relative to the periphery of the discharge opening is provided, and a support part that guides the tilting of the hot metal ladle with the spout facing the opening. It is made up of a combination of a lifting device that is moved between the position where residual hot pig iron is discharged downward and the supporting part described above, and a heat-insulating lid equipped with a heating means.

Now, with reference to FIG. 1, a method of operating a pig iron mixing car according to the present invention will be explained in conjunction with its operating equipment.

As shown in the figure, a frame 3 is placed near the end of the running track 2 of the pig iron mixer car 1 and straddles the track at a height that exceeds the vehicle limit of the running track 2.
A traveling trolley 4 carrying a slag breaker device 5 is mounted on the frame 3 so as to be movable. The slag breaker device N5 is equipped with an air breaker 7 at the tip of an arm 6 that can move forward and backward with respect to the pig iron mixer car 1, and the air breaker 7 is used to sow off slag 8 that has adhered to the vicinity of the discharge opening of the pig iron mixer car 1. do.

Further, a pit 9 is provided below the running track 2, and a pot truck 10 that reciprocates in a direction intersecting the running track 2 of the pig iron mixer car 1 is arranged in the pit 9. A hot metal ladle 12 for receiving residual hot metal 11 in the pig iron mixer car 1 can be placed on the ladle truck lo.

The hot metal ladle 12 that has received the residual hot metal 11 is covered with a thermal insulation lid I3 to prevent heat radiation inside the hot metal ladle 12, and the residual hot metal 11 is heated by the heating burner 14 incorporated in the thermal insulation lid 13 to prevent its solidification. prevent. The heat-insulating lid 13 can be attached to and removed from the hot metal ladle 12 by using, for example, an overhead crane or by mounting a tilting device for the heat-insulating lid 13 on the pot truck 10.

Further, the hot metal ladle 12 is lifted by a lifting device 15 such as an overhead crane and placed on a support 16 provided on the frame 3. The support part 16 guides the tilting movement of the hot metal ladle 4 and serves to return the remaining hot metal 11 in the hot metal ladle 12 into the pig iron mixing car I.

Further, 17 is a movable dust collection hood, which is located directly above the pig iron mixer 1 and collects dust.

Next, the operation procedure will be explained.

When the pig iron mixing car 1 reaches the end of the running track 2 after discharging the hot metal, the air breaker 7 of the slag breaker device 5 is activated.
8 near the discharge opening of the pig iron mixer car 1,
To facilitate the discharge of residual hot metal 11 inside.

Next, the pig iron mixer 1 is gradually tilted to discharge only the residual hot metal 11 inside into the hot metal ladle 12. Then, the ladle truck 1o is moved to move the hot metal ladle 12 away from under the pig iron mixer car 1, the upper surface of the hot metal ladle 12 is covered with a heat insulating lid 13, and the remaining hot metal 11 is heated by a heating burner 14 so as not to solidify.

At the same time as the hot metal ladle 12 is moved from under the pig iron mixer car 1, the pig iron mixer car 1 is further tilted compared to when the remaining hot metal 11 is discharged, and the residue 18 including the particles 8 inside the pig iron mixer car 1 is discharged into the bit 9. The discharged residue 18 is carried outside using a scraper, shovel car, or the like (not shown).

After discharging the slag 18, the pig iron mixing car 1 is returned to an upright position, and the hot metal ladle 1 is
After stopping the heating of the remaining hot metal 11 in the hot metal ladle 1 and removing the heat insulating lid 13, the hot metal ladle 12 is lifted by the lifting device 15 and placed in the support part 1.
Set to 6. Next, the movable dust collecting hood 17 is moved above the hot metal ladle 12 to collect dust, while the hot metal ladle 12 is tilted to return the residual hot metal 11 inside into the pig iron mixing car 1.

After the residual hot metal 11 has been discharged, the hot metal ladle 12 is transferred to the ladle truck 10 again.
The hot metal ladle 12 is put back on top, and the hot metal pot 12 is covered with a heat-insulating lid 13 to stand by until the next time. During this time, the hot metal ladle 12 is heated using the heating burner 14.
The interior is preheated to prevent the temperature of the hot metal from decreasing when the remaining hot metal 11 is received.

After that, the above operation may be repeated.

(Function) Improving the transport efficiency of a pig iron mixer car is to secure the effective internal volume of the pig iron mixer car. , the internal volume can be increased by removing debris including debris. As can be seen from the relationship between the amount of slag discharged, the effective internal volume, and the amount of pig iron received shown in Table 1, it is clear that the increase in the amount of pig iron received is proportional to the amount of slag discharged.

Table 1 Relationship between the amount of slag discharge, effective internal volume, and amount of pig iron received. Also, in the method of the present invention, the molten pig iron remaining in the pig iron mixer car and the slag are discharged separately. This can be done by changing the inclination angle of the pig iron mixer because the fluidity of the two is different. Then, by using a hot metal ladle as a container to receive the residual hot metal, heating the residual hot metal discharged into the hot metal ladle to prevent it from turning into cold pig iron, and discharging the hot metal ladle again to the mixing car, the residual hot metal is effectively used. ing. The reason why the container for receiving the residual hot pig iron and the hot metal ladle are used is that the pouring spout can correspond to the discharge opening of the pig iron mixing car, so that it is easy to receive the residual hot pig iron and discharge it to the pig iron mixing car.

The angle of inclination of the pig iron mixing car varies depending on the composition and solidification temperature of the hot metal and slag, but according to the experiments shown in Table 2, residual hot metal can be almost completely discharged with an inclination of up to 125°.
It was found that if this angle of inclination was exceeded, the residue would also be discharged.

Table 2 There is no other relationship than the inclination angle of the pig iron mixer car and the amount of hot metal delivered, and the actual amount of delivered hot metal is zero.

(Example) Examples of the present invention will be described below.

The pig iron mixing car uses a capacity of 250, and the hot metal to be received is C: 4.
．． 5wt%, Si: 0.40wt%, Mn: 0
．． It is a common hot metal with a content of 24wt%.

First, the adhesion from the pig iron mixer opening was removed using a slag breaker.

Next, the pan wheel carrying the hot metal ladle preheated to 1150° C. or higher was moved to the lower part of the pig iron mixer car, and then the pig iron mixer car was gradually tilted and held at an inclination angle of 120° for 10 minutes. The amount of residual pig iron recovered at this time was 3 tons.

The pot truck is moved backwards and evacuated, and the pig iron mixing truck continues to rotate to begin discharging the residue. The hot metal pot on the pot truck is covered with a heat-insulating lid and heated.

When discharging the residue, the pig iron mixer is rotated 360 degrees to extract it from inside. The above rotation is performed 4 to 5 times, and the required time is 1
0 minutes, and the amount of discharged residue was 4 tons.

The pig iron mixing car was returned to an upright position, and then the heat insulating lid on the hot metal ladle was removed, and the hot metal ladle was mounted on a support section on the frame using a crane, and then tilted and returned to the inside of the pig iron mixing car. The temperature of the hot metal during this return was 1250°C.

Further, the embodiment of the operational equipment of the invention is as described above based on FIG. 1.

In the embodiment shown in FIG. 1, the residue is discharged onto the focus, but a method may also be adopted in which the residue is received in a container or the like and the container is carried out. Further, when discharging the slag, the pig iron mixer is rotated and then held, but it is preferable to perform the slag while rotating or swinging to promote the discharge of the internal slag.

In addition, the support part is not limited to one that directly rotates the hot metal ladle as shown in Figure 1, but also a support part that can be used, for example, by using an overhead crane to lift up one end of the bottom of the hot metal ladle and tilt the hot metal ladle. good.

(Effects of the Invention) As explained above, according to the present invention, it is possible to increase the amount of pig iron received by the pig iron mixer car, improve the transport efficiency, and reduce the temperature of hot metal, the basic unit of flux such as desulfurization, the basic unit of refractory material, etc. It is advantageous. Furthermore, since residual hot pig iron is processed without being converted into cold pig iron, generation of rough pig iron can be prevented.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing an example of operational equipment. l...Pig mix car 2...Travel track 3...
Frame 5...Slag breaker device 6...Arm 11...Residual hot pig iron 12...
・Hot metal pot 13... Heat insulation lid 15... Lifting device 16... Support part 18... Residue.

Claims (1)

[Scope of Claims] 1. Regarding the residue mainly consisting of slag and residual hot metal remaining in the pig iron mixer car after discharging the loaded hot metal, first, the tilting posture of the pig iron mixer car is adjusted to an angle that allows selective discharge of only the remaining hot metal. At the end of the operation cycle of the pig iron mixer, the remaining molten pig iron is discharged, and the pig iron mixer is then rotated further, or the slag inside the pig iron mixer is discharged by rotation or rocking.
Before discharging the residual molten pig iron, scrape off the residue deposits near the discharging opening of the pig iron mixer car into the pig iron mixer car, and temporarily receive the residual molten pig iron discharged from the pig iron mixer car in a heated molten pig iron pot to melt it. Continue heating during the period of scraping off the slag and paying out together with the slag, and then return the heated residual hot pig iron to the pig iron mixer car which has been returned to an upright position and use it together with the received pig iron in the pig iron mixer car in the next cycle. , A method of operating a mixed iron truck characterized by the combination of . 2. Near the end of the running track of the pig iron mixer car, a frame is provided that straddles the track at a height higher than the vehicle limit, and a slug having an arm that can move forward and backward relative to the periphery of the discharge opening of the pig iron mixer car is installed on this frame. A breaker and a support part that guides the tilting of the hot metal ladle with the pouring spout facing the opening are provided, and the hot metal ladle has a position where the remaining hot metal is discharged downward when the pig iron mixing car is tilted, and the support part and the support part are provided. Operation equipment for a pig iron mixer truck, consisting of a lifting device for moving between the two, and a heat-insulating lid equipped with a heating means.