JP5582113B2 - Steel slag discharge method from slag pan - Google Patents

Description

  The present invention relates to a method for discharging steel slag remaining in a slag pan from the slag pan.

  Molten steel slag generated in the steelmaking and steelmaking processes is poured into a slag pan and transferred to a slag treatment plant in the steelworks, and then the slag pan dolly is tilted and discharged from the slag pan. At the time of this discharge, the high-temperature steel slag that could not be discharged due to the tilting of the slag pan and remained solidified in the slag pan was scraped from the front side using a heavy machine or the like.

  However, when scraping out high-temperature steel slag that has solidified in the slag pan using heavy equipment, it is a work on the front side, so if the discharged steel slag collapses to the heavy equipment side, a fire will occur in the heavy equipment There is a risk. Even if heavy machinery does not lead to fire, there is a risk of crew injury. In addition, if there is water at the discharge position, there is a risk of a steam explosion.

  In order to eliminate such danger, the entire amount of high-temperature steel slag is cooled to room temperature.

  However, although the time varies depending on the size of the slag pan, it takes about 8 hours to cool it until it solidifies to room temperature. During the cooling, use the slag pan to receive the next steel slag. Because it is not possible, the operating efficiency is reduced. In practice, spare slag pan carts will be operated, but it goes without saying that the operating efficiency is better because the number of spare slag pan carts is limited.

  Moreover, since the inner surface of the slag pan is damaged by the scraping work, repair is necessary. During this repair period, the slag pan equipment cannot be operated, which is one of the factors that reduce the equipment margin.

  In order to solve the above-mentioned problem, for example, in Patent Document 1, even if the converter slag pot is tilted, the converter slag adhered to the pot without being discharged outside the pot is remotely controlled inside the slag pot. A method of crushing and removing with an iron arm and a hard crushing tool provided with a vibration mechanism is described.

  However, since the method described in Patent Literature 1 applies a blow to the inner surface of the slag pan with a crushing tool, the inner surface of the slag pan is damaged, such as unevenness and cracks, and the slag pan cannot be worn out. There is. Moreover, since the crushing tool contacts the inner surface of the slag pan, there is also an environmental problem that a large noise is generated during work.

  Patent Document 2 describes a method of discharging a large residue adhering to the inside of the waste pan using an attached waste discharge facility attached to the crane.

  However, the method described in Patent Document 2 also has a problem similar to the method described in Patent Document 1 because the attached wrinkle removing device is inserted into the inner surface of the waste pan and hit.

Japanese Patent Laid-Open No. 5-45072 JP-A-5-45073

  The problem to be solved by the present invention is that, when the steel slag remaining solidified in the slag pan is discharged from the slag pan by the conventional method, the inner surface of the slag pan is damaged, such as irregularities and cracks, and the slag pan is worn out. It cannot be prevented, and a large noise is generated during work.

Steel slag discharge method from the slag pan of the present invention,
When discharging steel slag remaining in the slag pan from the slag pan, to prevent damage to the inner surface of the slag pan, such as unevenness and cracks, and to prevent generation of loud noise during work ,
A method of discharging steel slag remaining in a slag pan from a slag pan at a slag treatment plant,
When tilting the slag pan trolley that transports the slag pan to the slag treatment plant and discharging the steel slag from the slag pan , the amplitude of the slag pan at the tilting position is 10 mm or more, less than 100 mm, and the frequency is 10 Hz or more, 40 Hz. The most important feature is that the following vibration is applied .

  In the present invention, when tilting the slag pan cart that transports the slag pan to the slag treatment plant and discharging the steel slag from the slag pan, the slag pan is simply swung at the tilting position without being scraped by a heavy machine or the like. However, the steel slag remaining in the slag pan can also be discharged.

  According to the present invention, the high-temperature steel slag remaining in the slag pan is kept at a high temperature as much as possible without being cooled to room temperature, and is not easily scraped from a dangerous front side with a heavy machine etc. Can be discharged. Moreover, since it does not scrape out with a heavy machine etc., damage, such as unevenness | corrugation and a crack, does not arise in the inner surface of a slag pan, and wear of a slag pan can be suppressed. Moreover, since a crushing tool etc. do not contact the inner surface of a slag pan, the noise at the time of work can also be reduced.

(A) is a schematic explanatory drawing of the invention example at the time of discharging | emitting steel slag from a slag pan, (b) is a schematic explanatory drawing of a comparative example similarly. It is the figure which showed the result of having investigated the influence on the noise of a slag discharge rate, and is a figure which showed the relationship of the amplitude of a conventional example and comparative example invention examples 1-4, a rejection rate, and a noise value. It is the figure which showed the result of having investigated the influence on the noise of a slag discharge rate, and is a figure which showed the relationship of the frequency of a conventional example and comparative example invention examples 5-8, a rejection rate, and a noise value. It is the figure which showed the result of having investigated the influence on the noise of a slag discharge rate, and is the figure which showed the discharge rate and noise value of the prior art example and comparative example invention examples 8-13.

  In the present invention, when the steel slag remaining in the slag pan is discharged from the slag pan, the inner surface of the slag pan is not damaged such as unevenness or cracks, and no large noise is generated during the operation. The purpose of making it is realized by swinging the slag pan at the tilting position of the slag pan cart.

Hereinafter, the method for discharging steel slag from the slag pan of the present invention will be described.
The present invention relates to a method for discharging high-temperature steel slag remaining in a slag pan from a slag pan without performing an operation of scraping it using a heavy machine or the like.

  As explained earlier, when steel slag generated in the steelmaking and steelmaking processes cannot be discharged by tilting the slag pan, the steel slag is cooled and solidified to room temperature and then transferred to the slag treatment plant in the steelworks. , Using heavy machinery to discharge from the slag pan.

  When the steel slag is discharged by tilting the slag pan, in the present invention, the slag pan having the steel slag cooled to 800 ° C. is tilted in order to eliminate the danger due to the steam explosion in the watering operation performed after the discharge. The main feature is that it is swung at a different position.

  In such this invention, the high temperature steel slag which remained inside the slag pan can be discharged | emitted without scraping out from the front side using a heavy machine etc. At that time, by swinging from the back side of the tilted slag pan, it is possible to work while avoiding a dangerous front side from which high-temperature steel slag is discharged, and safety of work can be ensured.

  Further, in the present invention, since there is no scraping work using heavy equipment of high-temperature steel slag remaining inside the slag pan, damage to the inner surface of the slag pan is reduced and the repair cost of the slag pan is reduced and Noise such as impact sound generated during scraping work is also reduced.

  Furthermore, in the present invention, since the scraping work from the front side is not required, the steel slag inside the slag pot can be discharged from the slag pot without cooling to room temperature, and the cooling time can be shortened. In this way, it is possible to provide a surplus in the operating efficiency of the slag pan cart. And the equipment investment cost of a slag pan cart can be suppressed by generating equipment surplus capacity.

  In the present invention, it is desirable that the amplitude of vibration applied to swing the slag pan is 10 mm or more and less than 100 mm. If it is less than 10 mm, the fixed steel slag may not be discharged because the amplitude is small, and if it exceeds 100 mm, the amplitude is large, and noise similar to that in the case of hitting is generated.

  Further, the frequency of vibration applied to swing the slag pan is desirably 10 Hz or more and 40 Hz or less. This is because if the frequency is less than 10 Hz, the fixed steel slag cannot be discharged because the frequency is low. On the other hand, when the frequency exceeds 40 Hz, the frequency is high, so that the same noise as that when a blow is applied is generated.

  Further, in the present invention, the vibration applied to swing the slag pan is not applied intermittently as in the case of striking or scraping, but continuously with the vibration oscillator etc. in contact with the object. The slag pan is swung by applying a strong force, and the steel slag needs to be discharged from the slag pan by swinging the slag pan by applying vibration.

  The method of swinging the slag pan is not particularly limited, but for example, a vibration oscillator adopted for a consolidation machine is attached to the tip of a heavy machine, and the slag pan is shaken by contacting it from the back of the slag pan. And a method of attaching a vibration oscillator directly to the slag pan cart and applying vibration to the slag pan to oscillate. Moreover, the method of adding a vibration to the whole slag pot trolley | bogie by making the slag pot trolley | bogie on a rail rotate forward and backward together with a rail may be used.

  The vibration oscillator used in the consolidation machine rotates a pair of eccentric rotors at high speed with a hydraulic motor, and the centrifugal force of the left and right rotors is synthesized in the vertical direction, and the horizontal centrifugal force is canceled by the left and right rotors. Thus, the vibration generated in the vibration generating portion having a configuration in which no lateral vibration is generated is transmitted to the rolling plate.

  In the present invention, before pouring the molten steel slag into the slag pan, the granular steel slag whose particle size is adjusted in advance is laid in the slag pan, and the molten steel slag is directly on the inner surface of the slag pan. If not touched, the steel slag and the slag pan can be prevented from sticking during cooling. Therefore, the discharge of steel slag becomes good, and the time required for the discharge work can be shortened.

  In the present invention, the steel slag previously laid in the slag pan preferably has a particle size of 10 mm or more and 200 mm or less, and more preferably 100 mm or less. When the particle size exceeds 200 mm, the steel slag is too large to reduce the area where the inner surface of the slag pan and the molten steel slag come into direct contact with each other, preventing the steel slag and slag pan from sticking during cooling. It is because it is not possible. On the other hand, if the particle size is less than 10 mm, the process of crushing and sizing steel slag will be complicated, leading to cost deterioration, and dust generation will become extremely environmental problems when laid in the slag pan. is there.

  In the present invention, before pouring molten steel slag into the slag pan, powdery slaked lime or limestone slurry is applied in advance into the slag pan, and the molten steel slag is applied to the inner surface of the slag pan. Even if the slag is not touched directly, the steel slag and the slag pan can be prevented from sticking during cooling, the steel slag can be discharged well, and the time required for the discharge work can be shortened.

  In the present invention, the slaked lime or limestone slurry previously applied in the slag pan preferably has a particle size of 3 mm or less, more preferably 1 mm or less. If the particle size exceeds 3mm, the slaked lime or limestone particles are too large to adhere to the inner surface of the slag pan, and it is not possible to reduce the part directly touched by the molten steel slag. This is because it is not possible to prevent the sticking. The slurry concentration (= 100 × [(slaked lime or limestone) / {(slaked lime or limestone) + water}]%) is preferably 5% or more from the viewpoint of increasing the amount of the applied slaked lime or limestone. 20% or less is desirable from the viewpoint of preventing clogging in the transport pipe. Furthermore, when injecting molten steel slag into the slag pan in the next step, it is desirable to apply immediately after discharging the steel slag in order to eliminate the risk of steam explosion due to residual moisture after slurry application. It is desirable that the temperature of the pot at the time is 300 ° C. or higher.

Further, in the present invention, when the molten steel slag is poured into the slag pan, the steel slag remains in the slag pan even if the slag pan is swung as described above. Sticking can be prevented, and the discharge of steel slag is improved.

  In addition, before pouring molten steel slag into the slag pan, after laying granular steel slag whose particle size is adjusted in advance in the slag pan, or after applying powdered slaked lime or limestone slurry In this state, when the molten steel slag is poured into the slag pan, if the slag pan is swung, the steel slag is further discharged.

  Although the test result performed in order to confirm the effect of this invention is demonstrated below, this is an example of this invention and does not limit the content.

  Table 1 below shows the test conditions, and FIG. 1 shows an outline of the slag discharge test. The test was conducted by injecting 40 tons of steel slag into a 50 tons slag pan.

  The conventional examples in Table 1 are obtained by injecting molten steel slag into the slag pan and tilting the slag pan after the steel slag has cooled and solidified (about 800 ° C.).

  Moreover, as shown in FIG.1 (b), a comparative example injects the molten steel slag 2 in the slag pan 1, and after the steel slag 2 cools and solidifies (about 800 degreeC), the slag pan 1 is attached. It is tilted and hit with a hard iron crushing tool 4 attached to the heavy machine 3 from the back of the slag pan 1.

  On the other hand, as shown in FIG. 1 (a), Invention Examples 1 to 7 inject molten steel slag 2 into the slag pot 1, and cool the steel slag 2 to about 800 ° C. 2 is tilted to swing the slag pan 2. The slag pan 1 was swung by applying vibration to the slag pan 1 by bringing a vibration oscillator 5 attached to the tip of the heavy machine 3 into contact with the back of the slag pan 1.

  In the slag pan, Invention Example 8 has a particle size of 200 mm or less, and Invention Example 9 has a granular steel slag having a particle size of 100 mm or less, which is then poured into the molten steel slag. The slag pan is tilted and then the slag pan is swung after cooling to. The method of rocking the slag pan is the same as in Invention Examples 1-7.

  In Invention Example 10, molten steel slag was poured while being shaken by applying vibration in the slag pan, and after cooling to about 800 ° C., the slag pan was swung while being tilted. Is. The method of rocking the slag pan is the same as in Invention Examples 1-7.

  Invention Example 11 is a method in which a granular steel slag having a particle size of 200 mm or less is preliminarily placed in a slag pan, and then molten steel slag is injected while being shaken by applying vibration to the slag pan. The slag pan is swung in a state where the slag pan is tilted after being cooled to the end. The method of rocking the slag pan is the same as in Invention Examples 1-7.

  In Invention Example 12, after applying a slurry in which a powdery slaked lime having a particle size of 3 mm or less was adjusted to a concentration of 10% in a slag pan in advance, molten steel slag was injected, and the steel slag became about 800 ° C. The slag pan is tilted and then the slag pan is swung after being cooled down. The method of rocking the slag pan is the same as in Invention Examples 1-7.

  In invention example 13, after applying a slurry in which a powdery slaked lime having a particle size of 3 mm or less was adjusted to a concentration of 10% in a slag pan in advance, the molten steel slag was shaken while applying vibration to the slag pan. The slag pan is swung in a state where the slag pan is tilted after being poured and cooled to about 800 ° C. The method of rocking the slag pan is the same as in Invention Examples 1-7.

  The test results of the conventional example, the comparative example, and the inventive examples 1 to 13 are shown in the following Table 2 and FIGS.

  The waste rate at the time of discharge | emission of the steel slag from a slag pan shown in Table 2 and FIGS. 2-4 was performed by the calculation shown to following Formula. The noise was measured by proximity noise measurement at a 10 m point.

Waste rate (%) = (Number of steel slag discharged from the slag pan after cooling to about 800 ° C. under each condition during the test period / Total number of slag pots under each condition during the test period) × 100
Whether or not “steel slag was discharged from the slag pan” in the above formula was determined by visual judgment.

  From the test results shown in Table 2 and FIGS. 2 to 4, it was found that the following effects can be obtained in the present invention as compared with the conventional example and the comparative example.

  In the conventional example, there is no work to crush with the crushing tool from the back of the slag pan, or scraping out the steel slag that has remained solid in the slag pan, so the noise during the discharge work was 65.0dB, The rejection rate of steel slag from the slag pan was 6.0%.

  Moreover, in the comparative example, by applying a blow with a crushing tool from the back of the slag pot, an evacuation rate of 84.0% was secured, but as a reflection, the noise during the evacuation operation was 108.0 dB. In addition, since the slag pan was hit with a crushing tool from the back, the outside of the slag pan became concave and the inside became convex, and damage that the inner surface of the pan was not a smooth bowl was observed. If such deformation becomes significant, it becomes a gourd type, and the discharge of slag is hindered by the effect of the constriction. Moreover, a crack may arise in a slag pan in order to add a blow. When a crack occurs, it is necessary to repair the slag pan (melting, grinding, overlaying, etc.), and the repair cost is high, so that the manufacturing cost of the crude steel deteriorates.

  That is, the conventional example is not a satisfactory discharge method in terms of the rejection rate, and the comparative example is in terms of noise.

  On the other hand, in the case of the inventive examples 1 to 13, by swinging the slag pan at the tilting position, it was possible to secure a rejection rate of 70% or more, and a good steel slag discharge effect was obtained. Further, since the slag pan was only swung at the tilting position, the noise during the discharging operation was 100 dB or less in any case, and the slag pan was not damaged.

  Furthermore, in the case of Invention Examples 1 to 13, since it is not necessary to cool the steel slag to room temperature, the cooling time can be shortened, and the operating efficiency of the slag pan dolly can be provided.

  The present invention is not limited to the above example, and it goes without saying that the embodiments may be changed as appropriate within the scope of the technical idea described in each claim.

  For example, in the above example, a vibration oscillator that employs a vibration oscillator that is used for a consolidation machine is shown, but other vibration oscillators can be used as long as the slag pan is swung at the tilting position. You may do it. Similarly, the amplitude and frequency of the vibration oscillator are not limited to those implemented in the test.

1 Slag pan 2 Steel slag 3 Heavy machinery 4 Crusher 5 Vibration oscillator

Claims (4)

A method of discharging steel slag remaining in a slag pan from a slag pan at a slag treatment plant,
When tilting the slag pan trolley that transports the slag pan to the slag treatment plant and discharging the steel slag from the slag pan , the amplitude of the slag pan at the tilting position is 10 mm or more, less than 100 mm, and the frequency is 10 Hz or more, 40 Hz. A method for discharging steel slag from a slag pan, characterized by applying the following vibrations .   2. The slag according to claim 1, wherein when the molten steel slag is poured into the slag pan, the molten steel slag is poured in a state in which granular steel slag is previously laid in the slag pan. How to discharge steel slag from the pan.   When injecting molten steel slag into a slag pan, molten steel slag is injected in a state where powdery slaked lime or limestone slurry is applied in advance into the slag pan. Steel slag discharge method from the described slag pan. When molten steel slag is poured into the slag pan, the molten steel slag is shaken with the amplitude being 10 mm or more and less than 100 mm and the frequency being 10 Hz or more and 40 Hz or less. It inject | pours, The steel slag discharge | emission method from the slag pan in any one of Claims 1-3 characterized by the above-mentioned.

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