JPH11131124A - Method of measuring flowing-out quantity of slag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To safely and accurately measure slag quantity flowed out into a ladle from a converter during an ordinary operation without temporarily stopping the operation for the measurement. SOLUTION: In a method of measuring the flowing-out quantity of the slag flowed out into the ladle based on a measured weighting value obtd. by measuring the wt. of the ladle with a weighing device at the time of measuring the slag quantity flowed into the ladle from the converter at the initial stage and the end stage of the steel tapping in the case of tapping the molten steel in the converter into the ladle, at the initial stage of starting the tapping of molten steel into ladle from the converter, a lower limit inflection point position, at which the weighing value measured with the weighing device is temporarily lowered and again started to increase, is detected. This weighing value with the weighing device at the lower limit inflection point position is made the flowed-out slag quantity at the initial stage.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for measuring the amount of slag flowing into another container when transferring molten metal from one container to another container.

[0002]

2. Description of the Related Art For example, slag flowing out of a converter and floating on a molten steel ladle (hereinafter referred to as a ladle) is estimated by estimating the molten steel temperature, thereby reducing the blow-off temperature of the converter, and determining the amount of molten steel in the ladle. The impact on operations, such as automation of raising and lowering the dip tube or ladle in the next smelting process, control of the casting end point in the continuous casting process, quality assurance by estimating the degree of contamination of molten steel, is enormous. Very important.

In order to measure the amount of slag, when the operator inserts a metal rod into the molten steel from above the ladle, the part of the metal rod that has reached the molten steel is melted, and the slag part is red-hot and remains. The slag amount is determined by measuring the length of the portion. In addition, a load cell type weighing machine is installed on the steel receiving cart of the converter, and pre-treatment such as taring of the ladle is performed before the steel receiving tray is mounted and before the steel receiving tray is loaded. There is a method of subtracting the value obtained at the time of the pretreatment from the weight at the time of completion of the steel receiving, and using this as the amount of molten steel that has been tapped.

[0004]

However, the method of measuring the amount of slag by inserting a metal rod into the ladle is inexpensive and reliable, but the operator must approach a hot ladle. In addition, it is necessary to temporarily stop the operation for the measurement, and the productivity is reduced.

In the early stage of tapping from the converter, slag floating on the molten steel in the converter flows out when passing through the tapping hole, and is mixed with the molten steel at the end of tapping. Slag flows out. For this reason, since the weighing value of the weighing device installed on the steel receiving trolley includes the slag weight that has flowed out, it is difficult to separate the molten steel weight and the slag weight by the steel receiving trolley weighing method. From this, the amount of slag flowing out is assumed to be constant and subtracted from the measured value of the weighing device. But,
The amount of slag flowing out varies greatly depending on the cross-sectional area of the tap hole, the type of steel, and the like, and is therefore extremely coarse.

Therefore, the amount of slag flowing out of the converter into the ladle is safe during normal operation, the operation is not temporarily stopped for measurement, and there is no accurate measuring method. Development was strongly desired.

[0007]

Means for Solving the Problems The present invention has been made to solve the above-mentioned problems, and the means 1 is used for transferring molten metal from one container to another at the beginning and the end thereof. When measuring the amount of slag flowing into another container from the container, in a method of measuring the weight of the other container with a weighing device, and measuring the amount of slag flowing into the other container based on the measured weighed value, At the initial stage of transferring the molten metal from one container to another container, the lower limit inflection point position at which the weighing value measured by the weighing device temporarily decreases and starts to increase again is detected. In this method, the weighed value of the weighing device at the position is used as an initial outflow slag amount.

[0008] The means 2 is for transferring molten metal from a container.
When transferring to another container, the container at the beginning and the end
When measuring the amount of slag flowing into other containers from
The weight of the container is measured with a weighing device, and based on the measured weighing value,
In the method of measuring the amount of slag outflow into the other container
At the discharge hole for discharging molten metal from a container.
A slag detector, and the slag detector detects
Detects the point at which slag starts to flow, and after this point
From the detection signal value of the slag detector and the discharge hole
Detection signal of the slag detector at the time when only
The difference between the values is the time when the discharge of the molten metal from the discharge hole is stopped.
Slag outflow volume equivalent value V ₁Seeking and sharing
Does not discharge molten metal or slag from the discharge hole
From the time to the time when only molten steel is flowing out of the discharge hole
Of output value of slag detector during slag outflow period in Japan
Is integrated during the slag outflow period and the solution discharged from the discharge hole is integrated.
Calculate the value V corresponding to the total flow volume of molten metal and slag,
The slag outflow period from the weighed value measured by the weigher.
Between the molten steel and slag flowing out of the discharge hole
Outflow weight W is obtained, and the total outflow weight W and the obtained slag are obtained.
Outflow volume equivalent value V₁And molten metal and slag outflow
How to calculate the slag weight at the last stage based on the volume equivalent value V
Is the law. Means 3 is an initial value obtained by means 1 and 2.
Flow into the other container by adding the slag weight at the end
This is the method used as the slag weight.

The operation of the present invention will be described below. The slag flowing from the converter into the ladle is divided into slag flowing at the beginning of tapping and slag flowing at the end of tapping at the start of tilting of the converter, and the amount of slag flowing onto the ladle is obtained by adding both.

First, a method of measuring the amount of slag initially discharged will be described. When the converter starts rotating, slag 3 begins to flow out of the tapping hole 2 as shown by the dotted line in FIG. Further, as the converter 1 is tilted, the tapping hole 2 gradually moves from the slag position to the molten steel position, and the molten steel starts flowing out. If the boundary between the two is clear, it can be found by a change in weight. . Since the specific gravity of this molten steel is about twice that of slag,
It is presumed that there is an inflection point of weight increase at the point where slag is switched to molten steel.

According to the present invention, the weight of the slag and molten steel flowing into the ladle is analyzed by a weighing device provided on the steel receiving cart, and as a result, the tapping is started as shown in FIG. (A
It was found that 3 to 4 seconds after (point b), the measured weight value temporarily decreased (point b) prior to the outflow of molten steel. This change occurs in a very short time (about 0.2 to 0.3 seconds)
Although it is easy to overlook because the amount of change in the measured value of the weighing device is small, it has been found that when a change in weight is differentiated, a phenomenon that appears significantly as shown in FIG. 4B occurs.

When the converter is tilted gradually at the start of tapping from the converter, molten steel starts to flow on the converter walls toward the tap hole, and the molten steel has a surface tension of 1200 to 1800 d.
ln / cm, which is about 3 times the slag, which is relatively large (slag is 400 to 600 dyn / cm), and has poor wettability with refractories.
The tip is not an elongated needle-like tip, but has a bulge as shown by a solid line in FIG. 3 and has an arc shape. The arced molten steel 13 reaches the tapping hole 2. Rather than immediately flowing into the tapping hole and flowing down, the inflow is suppressed by surface tension, and furthermore, by this, it is pushed above the slag flowing into the tapping hole 2,
It is presumed that the above-mentioned phenomenon occurs because the molten steel in the arc-shaped portion suddenly flows into the tap hole and flows down after the state in which the outflow starts to be suppressed is generated.

Accordingly, the weight change speed is obtained by differentiating the weighed value from the weigher, and the point at which the weight change speed decreases and starts to increase again is detected, and the initial outflow slag amount is determined from the weighed value of the weigher at this time. Is required.

Next, a method of measuring the amount of slag at the end of tapping will be described. In order to measure the amount of slag at the end of tapping, the weighing value of the weighing device provided on the steel receiving truck was analyzed as obtained for the initial outflow slag amount. , And gradually flowed out, the transition point from molten steel to slag could not be obtained from this weighed value. Therefore, as a result of various experiments and examinations, it is possible to obtain the slag amount at the end of tapping on the basis of the output signal values of the magnetic slag detector and the weigher installed in the tapping hole of the converter. It has been found.

That is, the output signal value of the magnetic slag detector changes in accordance with the slag mixing ratio in accordance with the start of slag outflow (the output signal value decreases as the amount of slag passing through the tap hole increases). Therefore, this change in the output signal value indicates a change in the volume ratio of slag and molten steel passing through the tap hole.

Therefore, the signal value at the time when the output signal of the magnetic slag detector starts to change at the end of tapping is used as a reference value, and the difference between this reference value and the present output signal value is determined. The suppression device (device for stopping the slag flowing out of the tapping hole) is operated to integrate during the period until the outflow of slag from the tapping hole is stopped to obtain the volume ratio of slag and molten steel, and By adding the specific gravity of molten steel and slag to the integrated value, it can be converted to a weight ratio.

On the other hand, the weighing device in a period from when the output signal of the magnetic slag detector starts to change at the end of tapping to when the slag suppressing device operates and the slag flows out of the tapping hole is stopped. (A value obtained by subtracting the weighing value at each time from the reference value with the weighing value at the start point of this period as a reference value), and integrating the same in the same manner as described above to obtain a tapping hole in the period. The total weight of the slag and molten steel flowing out of the furnace. Then, the slag outflow amount at the end of tapping can be obtained from the total outflow weight of the slag and the molten steel and the outflow weight ratio.

This will be described in detail based on the output signal value of the slag detector of FIG. 6 and the weighing value of the weighing device of the steel receiving cart. The output signal of the slag detector is at the lower limit before tapping, and is in the same state as the state where all tap holes are filled with slag. The output signal value of the slag detector at this time is defined as a reference value z. Then, when the molten steel flowing out of the tapping hole at the end of tapping starts to entrain the slag, the output signal of the slag detector decreases. Therefore, the point at which the output signal of the slag detector decreases, that is, the slag outflow start time t _{Find 0} .

Next, the slag flow starting time from said output signal value x of the slag detector of t ₀ tapping previous reference value minus the z (x-z), stop the outflow of slag from the tapping hole the (tapping end) time said from t ₁ slug flow starting time t
A value obtained by multiplying by a value obtained by subtracting ₀ (t ₁ −t ₀ ) and corresponding to the total outflow volume of slag and molten steel (a value corresponding to the total outflow volume) V
Ask for. Furthermore, the initial slag outflow volume amount by integrating the difference between the output signal values from the slag detector of each point in the tapping end time t ₁ from the output signal value x and the slag outflow start time t ₀ of the slag detector Equivalent value (Slag outflow volume equivalent value)
V ₁ (the hatched portion in FIG. 6A) is obtained.

Then, the volume ratio V ₁ / V is determined based on the total slag and molten steel outflow volume equivalent value V and the slag outflow volume equivalent value V ₁ . The slag density ρs and the molten steel density ρm are integrated with the volume ratio V ₁ / V, and converted into a weight ratio. Further, when the relation of ρm = 2 * ρs is taken into account, the ratio of the slag outflow weight W _{ss to} the total outflow weight W is expressed by the following equation (1). W _ss / W = V ₁ / (2 * V−V ₁ ) (1)

However, since the slag does not flow into the ladle when the slag starts flowing out of the tapping hole, the delay time t _x0 until the slag flows out reaches the ladle and even at the time when the slug suppression device outflow of slag from to tapping hole operation has stopped, there is a slag containing molten steel that flows down from the tapping hole in the ladle, at each of its delay time t _x It is preferable to add and correct the amount of molten steel-containing slag flowing down between the corresponding tap hole and the ladle. However, since the slag outflow amounts corresponding to the delay times t _x0 and t _x are substantially equal, only the delay time t _x at the end of tapping is considered here.

According to Bernoulli's theorem, the time t _{X at} which the molten steel-containing slag which finally flowed out of the tap hole reaches the ladle is H, the liquid level in the converter is H, and the ladle is from the tap hole. Assuming that the inner level distance is L and the gravitational acceleration is g, the following equation (2) is obtained. t _X = (2 / g) ^1/2 * ((HL) ^1/2 -H ^1/2 ) Equation (2)

Next, from this (t ₀ + t _X ) time point, (t ₁ +
t _x ) Weight change of weigher between time points (total end outflow) 期
Find W ₀ . Since △ W ₀ corresponds to W in the equation (1), the slag weight W _ss is obtained from the following equation (3). W _ss = △ W ₀ * W _s / W = △ W ₀ * V ₁ / (2 * V−V ₁ ) (3)

If the slag control device is not installed, the converter furnace is raised vertically at a high speed when the operator recognizes the slag detection. By using this time instead of the signal at the time of completion of the operation of the slag suppression device, it is possible to calculate the terminal slag outflow amount in the same manner as described above. However, in this case, even after the high-speed tilting, the slag flows out until the slag from the tapping hole reaches an angle at which the slag does not come out. It is preferable to correct the minute.
By adding the end-stage outflow slag amount obtained in this way and the initial outflow slag amount obtained above, the total amount of slag flowing out of the converter into the molten steel ladle can be obtained.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a diagram showing a configuration of an entire apparatus showing an embodiment of the present invention, and an embodiment of the present invention will be described with reference to this drawing. The magnetic slag detector 7 (the transmitting coil and the receiving coil are connected to the tap hole 2 of the converter 1).
The slag outflow is detected by utilizing the fact that the magnitude of the electromotive force generated in the receiving coil is different due to the difference in the magnetic properties of the substances flowing in the tapping hole 2 with the interposition therebetween. is there. That is, as the slag 3 flowing out from the tapping hole 2 increases, the output signal value decreases, and as the molten steel increases,
The output signal value is configured to be large. ) Is installed and the output signal is input to the converter 9 where it is converted to a slag outflow signal, which generates an alarm signal indicating that the outflow of a predetermined amount of slag 3 from the tap hole 2 has started. .

The warning signal is sent to the slag amount calculation device 10 and the converter control device 11. In the converter control device 11, when the warning signal is input, the slag suppressing device 8 (high pressure gas is blown into the tapping hole 2). In this way, the surrounding air is sucked into the tap hole 2 by an ejector effect, and the sucked air drives a device for suppressing the outflow of the molten steel-containing slag 3) to stop the outflow of the slag 3. The slag amount calculation device 10 calculates the slag amount from the weighing signal value of the weighing device 6 and the output signal of the converter 9 and transmits the calculation information to the process computer 12 via the converter control device 11.

Next, the signal processing procedure of the slag amount calculation device 10 will be described in detail with reference to FIGS. When the slag 3 flows out, the weighing signal value of the weighing device 6 is at most about 180 ton with the tare of the ladle 5 compared to the weighing signal value (0 to 600 ton) at the time of tapping completion. Since it is as small as about 5 tons, the measurement error increases due to noise on the weighing signal. Therefore, the weighing signal of the weighing device 6 is input to the filter processing unit 101 (S1).
Then, a filtering process such as moving average of the input weighing signal is performed to remove noise (S2).

Then, the initial slag calculating unit 102 captures the processed weighing value signal at intervals of a seconds (about 3 seconds) (the input signal is shown in FIG. 4A) and performs the following processing. First, a weight change rate ΔQ of the weighed value is obtained by differentiating the taken weighing signal (shown in FIG. 4B) (S3). In this case, the interval of taking in the weighing signal is set to an interval of a seconds (about 3 seconds) because the weight change rate ΔQ becomes too small in the value immediately before and immediately after the sampling, and the detection accuracy deteriorates. Further, the weight change rate ΔQ and a preset reference value A
When the weight change rate ΔQ is equal to or more than the reference value A [point a in FIG. 4A] (S5), it is determined that the slag 3 has flowed out of the tapping hole 2 and at this time stores the time T _t and the weighing signal value W ₀ of the (S6).

[0029] When the Zuragu outflow start time T _t and the weighing signal value W ₀ at that time is stored, the Le - preparative through again de - the CNT so data is not overwritten to 1 and 0 (S4, S7). When CNT is 1, the deviation between the sampling weight change rate △ Q _t-1 which is immediately before the weight change rate △ Q _t and the △ Q _t of slag outflow start time _{T t X t = △ Q t} - △ Q
_t-1 sequentially determined (S8), and compares the reference value C set in advance and the deviation X _t, slag exit velocity is decreased by swelling before the molten steel outflow from the deviation X _t is smaller than the reference value C [B in FIGS. 4A and 4B
Point] (S10).

If it is determined that the slag outflow speed has decreased, FLG is changed to 1 and 0 (S9, S1).
1). FLG compares the reference value B set in advance and the deviation X _t and the 1, the deviation X _t is larger than the reference value B,
It is determined that the deviation _Xt has changed from a decrease to an increase again, that is, it is determined that the outflow of the initial slag 3 from the tap hole 2 has been completed [point c in FIG. 4B] (S12).

Assuming that the value immediately before the start of the rise is determined, that is, the time when the start of the rise is determined is _Tt , the time _Tt-1 immediately before (about three seconds before) and the weighing device 6
Storing weighing signal value W _t-1 of the (S13). The initial slag weight W _s the difference between the time T _t-1 and the weighing signal value W _t-1 and time of slag outflow at the start stored in the S6 T _t and the weighing signal value W ₀ respectively determined Te (S14), The initial slag amount storage unit 103 outputs the slag outflow time t _s to the initial slag amount storage unit 103, and stores this output. Finally, FLC and CNT are cleared to zero for the next measurement (S15).

Next, the means for measuring the final slag amount will be described with reference to FIGS. The output signal of the slag detector 9 is sampled at predetermined time intervals (3 second intervals), sent to the slag signal data storage unit 104, and stored for one charge. The output signal value before tapping of the slag detector 9 is stored in the tapping data storage unit 105 as a reference value z. When the operation start signal of the slag suppressing device 8 (or the vertical return signal of the converter 1) is input from the converter control device 11 to the terminal slag calculation start command unit 112, the terminal slag calculation start command unit 112 sets the terminal slag amount. Ratio calculation unit 107
Is notified of the start of calculation (point t in FIG. 6). As a result, the terminal slag amount ratio calculating section 107 stores the slag data in the slag data storage section 10.
Based on the data for one charge stored in 4, the slag outflow starting point X, that is, the time when the output signal value of the slag detector 9 starts dropping at the end of tapping and based on this value The ratio of the slag weight to the outflow weight (W _sm / W) is determined. The method for obtaining this will be described below.

The final slag amount ratio calculating section 107 outputs a slag detection output signal at time t when a calculation start command is input from the last slag calculation start command section 112 from the slag detection signal values stored in the slag data storage section 104. It retrieves a value y and last (previous sampling the output signal value) y _1, computes the extracted signal value difference between y and y ₁ a (y ₁ -y). Then, when the difference is positive extraction sampled output signal value y ₂ entered before y _1, again, the difference between both the (y ₂ -y ₁₎ determined, if the difference is positive,
Furthermore, the similarly compared retrieves the previous sampling output signal values, a sampling output signal value at the time that the difference becomes 0 as the reference value x, further slag outflow start time the time t ₀ when the And

Thereafter, a difference between the reference value x and each successively input sampling output signal value is obtained, and this difference is added.
This addition (equivalent to integrating period is 6 hatched portion) which performs the slag flow start time t ₀ until the operation is completed slag outflow stop time t ₁ of the slag suppression device 8. However, the point t ₁ is obtained by adding the operation time (1 second) of the slag suppression device 8 to the point t, and the slag outflow suppression device 8 receives the operation command (t
Point) This corresponds to the point in time when the suppression operation is actually completed. However, the reason for not directly obtaining the slag outflow stop time t ₁ is that
Since the slag suppressing device 8 is installed in the vicinity of the tapping hole 2, the operation completion detection sensor cannot be installed due to the high temperature environment, so that it is not possible to detect whether or not the suppressing operation is completed, and the operation starts. This is because estimating forced to slag outflow stop time t ₁ from the signal. The integrated value thus obtained is defined as a slag outflow volume equivalent value V ₁ .

Next, the difference between the reference value z and the reference value x stored in the data storage unit 105 before tapping is obtained, and this difference (XZ) is obtained.
Then, an integrated value at points t ₀ to t ₁ is obtained, and this value is set as a value V corresponding to the total outflow volume of slag and molten steel. The slag outflow volume equivalent value V ₁ and the total outflow volume amount equivalent value V thus obtained
Is substituted into the above equation (1), and the weight ratio (W
_sm / W) is calculated. In this way, if the total outflow weight W is added to W _sm / W calculated by the terminal slag amount ratio calculation unit 107, the slag weight W _sm can be calculated according to the above equation (3). There is a time lag due to the drop of molten steel between the time when is detected and the time when the weighing signal value of the weighing device 6 is captured. In obtaining the total outflow weight W, it is necessary to correct this time lag.

For this reason, the falling time calculating unit 108 calculates the molten steel falling time t from the tapping hole 2 based on the above equation (2) from the last slag outflow start time t ₀ and end time t _{1 of the} slag amount ratio calculating unit 107. Calculate _x . Then, based on the calculated molten steel falling time t _x and the slag outflow start and end signals of the terminal slag amount ratio calculating section 107 and the weighing signal value stored in the weighing signal storage section 109, the weighing value ratio calculating section 110 outputs the time (t). ₀ + t _x ) and the weighing weight corresponding to time (t ₁ + t _x ) are obtained, and the difference between the two is the total outflow weight Δ of the molten steel-containing slag that has flowed out at the end stage.
W ₀ . From the total outflow weight ΔW ₀ and the ratio (W _sm / W) obtained by the terminal slag amount calculating unit 107, the terminal slag amount calculating unit 111 calculates the terminal slag amount W _{sm in} accordance with the above equation (3).
Is searched for and memorized.

If the slag suppressing device 8 is not provided, the operator may recognize the slag and go back to the data at the time when a command to raise the converter furnace at a high speed is entered to obtain x.
In this case, the integration may be performed up to the time of the command input to set up the converter at high speed, but since the slag continues to appear for a while during the process of setting up the converter, the weighing device after the command to set up the furnace at high speed to the slag amount obtained from the integrated value It is necessary to add the change in the weighed value (slag outflow after command) of No. 6.

The terminal slag weight W _sm stored in the terminal slag amount calculating section 111 and the initial slag weight W _ss stored in the initial slag amount storing section 103 are sent to the total slag calculating section 113. Request total amount of slag W _s by adding both here. The signals of the initial slag amount storage unit 103, the final slag amount calculation unit 111, and the total slag calculation unit 113 are transmitted from the data transmission unit 114 to the process computer 12 via the converter control unit 11 as result signals. You.

In order to verify the slag amount obtained in this way, the tapping hole 2 is covered with an iron plate before starting tapping, the slag at the initial outflow is suppressed, and only the slag at the end of the converter is discharged (iron plate). Melts when molten steel starts to come out), and the slag thickness on the ladle 5 was compared with a value measured with an iron bar. FIG. 7 shows the result. In addition, the measured slag thickness was converted into a weight from the ladle 5 cross-sectional area. In addition, tapping is performed from the converter 1 in a normal state (a state in which the tapping hole 2 is not covered with the iron plate as described above) and the ladle 5
FIG. 8 shows a comparison result between the case where the slag amount is calculated using the method of the present invention and the measured slag amount obtained from the slag thickness using the conventional iron bar when the molten steel 13 and the slag 3 are received. As can be seen from these figures, the two showed relatively good agreement, and it was verified that the accuracy in the method of the present invention was good.

[0040]

By using the present invention to detect the amount of slag when tapping steel from the converter, the amount of slag flowing into the ladle every time tapping is performed without adversely affecting the operation of the converter. Can be grasped safely and accurately, so that the cost of molten steel processing in the post-process can be greatly reduced, and the effect in this field is great.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram showing an embodiment of the present invention.

FIG. 2 is a detailed block diagram of a slag amount calculation device.

FIG. 3 is a view showing a state of molten steel and slag in the converter at the time of starting tapping from the converter.

FIG. 4 is a diagram showing a weighing signal of a weighing device in an early stage of tapping and a value obtained by differentiating the weighing signal.

FIG. 5 is a block diagram showing a processing flow of a slag amount calculation device.

FIG. 6 is a diagram showing an output signal of a slag detector and a weighing signal of a weighing device.

FIG. 7 is a diagram showing a correlation when the amount of slag at the end of tapping is measured by the method of the present invention and the conventional method.

FIG. 8 is a diagram showing a correlation when the amount of slag flowing into a ladle is measured by the method of the present invention and the conventional method.

[Explanation of symbols]

 1: converter 2: tapping hole 3: slag 4: steel receiving trolley 5: ladle 6: weigher 7: slag detector 8: slag suppressor 9: converter 10: slag amount calculator 11: converter control Apparatus 12: Process computer 13: Molten steel 101: Filter processing unit 103: Initial slag amount storage unit 104: Slag data storage unit 105: Data storage unit before tapping 107: Terminal slag amount ratio calculation unit 108 : Fall time calculation unit 109: Weighing signal storage unit 110: Weighing value ratio calculation unit 111: Terminal slag amount calculation unit 112: Terminal slag calculation start command unit 113: Total slag calculation unit 114: Data transmission unit

Claims (3)

[Claims] When transferring molten metal from one container to another container, when measuring the amount of slag flowing into the other container from the one container at the beginning and at the end thereof, the weight of the other container is measured by a weighing device. Then, in the method of measuring the amount of slag flowing into the other container based on the measured weighed value, the weighed value measured by the weighing device at an initial stage when the transfer of the molten metal from one container to another container is started. Detecting the lower limit inflection point position at which the temperature temporarily decreases and starts to increase again, and using the weighed value of the weigher at the lower limit inflection point position as the initial outflow slag amount, the slag outflow amount measurement. Method. 2. When the molten metal is transferred from one container to another container, when measuring the amount of slag flowing into the other container from the one container at the initial stage and the last stage, the weight of the other container is measured by a weighing device. In the method of measuring the amount of slag flowing into the other container based on the measured weighed value, a slag detector is provided at a discharge hole for discharging molten metal from a certain container, and the slag detector detects the discharge hole. The time when the slag starts to flow out is detected, and the difference between the detection signal value of the slag detector after this detection time and the detection signal value of the slag detector at the time when only molten steel flows out from the discharge hole is calculated. only molten steel from the discharge hole from the time that does not discharge the molten metal or slag from the discharge hole with by integrating to the point of stopping the discharge of molten metal from said discharge hole seeking slag outflow volume equivalent value V ₁ is The difference between the output values of the slag detectors during the slag outflow period up to the time of discharge is integrated in the slag outflow period to obtain a value V corresponding to the total outflow volume of the molten metal and slag discharged from the discharge holes, From the weighed value measured by the weighing device, the total outflow weight W of the molten steel and the slag flowing out from the discharge hole during the slag outflow period was obtained, and the total outflow weight W and the obtained slag outflow volume equivalent value V ₁ and the melting were determined. A slag outflow measuring method, wherein the slag weight at the last stage is obtained based on a total outflow volume amount V of metal and slag. 3. A method for measuring the amount of slag flowing out, wherein the amount of slag flowing out to the other container is obtained by adding the amounts of slag in the initial period and the slag obtained in the last period obtained according to claim 1 and 2.