JPS6048486A - Molten metal slag removal method and device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention allows the slab on the molten metal to be sucked together with air into the suction head, and then to the suction.

Is it suffocated by cooling water inside the RAD? The present invention relates to a method for removing slag from molten metal and an apparatus used in the method.

Conventionally, in the above-mentioned molten metal slag removal method, when slab suction is started by lowering the suction head all at once to a height close to the slag above the molten metal, at the beginning of the slab suction, a number of hk of slabs higher than the set position are removed. VC may be suctioned all at once, and as a result, the amount of steam generated as the suction slag is cooled with water increases rapidly, causing a rapid expansion of steam in one suction system path. f
In the worst case, there is a problem that the pressure becomes extremely unstable, such as temporarily changing to a positive pressure state, and slag suction cannot be continued.

The first object of the present invention is to enable smooth opening and joining of slag suction by a method of rationally improving research results on excessive suction of slag at the start of suction.

The characteristic means of the first invention is that, in the molten metal slag removal method described above, the cooling water supply to the suction head is increased Myt immediately before the suction head starts suctioning the slag, and the cooling water supply is reduced after the suction head starts suctioning the slag. Its effects and young fruits are as follows.

In other words, the results of research on excessive suction of slag show that in the initial state before slag suction, only air and a certain amount of cooling water are suctioned, so the pressure loss in the suction system is extremely small. The suction force of the John head is much stronger than that of the steady slag suction type.Is it the initial suction head? -Ki settings 1 suction 11
．． It was found that when the slag was lowered to a height of 7I, the suction force exerted by the head on the slag on the molten metal became excessive, resulting in multi-port slag suction.

Therefore, by increasing the cooling water supply mk to the suction head immediately before the start of slag suction than the constant supply, the pressure loss in the initial suction system path is increased in advance due to the cooling water flow resistance, and the suction head This reduces the suction force, thereby preventing a sudden increase in transport resistance as the traction head approaches the slug. As shown by the caustic line in Figure 2, the vacuum level (■) can be suppressed stably with no reactionary excessive rise,
In addition, as shown in FIG. 8, the slag suction can be started completely smoothly when the suction slab bk (Gl) is completely reduced by only the carp corresponding to the increased cooling water ff1(Q).

Then, set the cooling water supply amount after starting slab suction.
By decreasing toward tJc iti, the second
As shown in Fig. 3, the cooling water decreases (approx.
Suction slab amount tGl k I*Vacuum degree i
While keeping Vlk constant, the suction slag is shortened (G
) 6. It is possible to gradually increase the steady suction i+L (Ga) VC, and the transition to the steady slag: pumping state can be carried out very secretly. Part 1! ,
As a result, the trouble caused by the occurrence of multiple fd A'A was reliably circulated, and the slag 1 residue work efficiency was greatly improved.

Book 6162 invention of lfJ r+J tri, 1111 description 11 shots IJ+method e) dog thin, r'? -Easy to Go λ Anzu, i [1 person/offer. I miss Q.

Features of the youngest brother 2 [S1] The IJ7 is connected to a suction head Vζ that suctions slag above the bath temperature, and a pumping air chamber, and also has cooling water that solidifies the slag in the suction head F? A sensor to which the water supply device J' is connected and which detects the height of the suction head 111 relative to the slag above the bath water;
A valve that changes the amount of cooling water supplied from the water supply device?
Based on the information from the sensor, it is determined whether the suction head is about to start slugging or after the suction of the slab has started.ft! l'lJ, and as the amount of cooling water supplied just before the start of slab suction increases, the amount of cooling water supplied decreases after the start of slag suction. The function and effect are as follows.

In other words, it is determined from the detection of the suction head height by the t-sensor whether slag suction by the suction head is just before or after it has started, and the above-mentioned first G6 method is carried out based on the detection result of the sensor. The ice rod change pulp uJ is fully adjusted to the water supply system θ so that the suction of the slab is started manually (by
j It is possible to omit historical manipulation, easily modify the first invention method, and is suitable without &A manipulation because it is a human manipulation.
It has now become possible to implement JVc, and it has become possible to further improve the slag removal work efficiency.

Next, embodiments of the first and second inventions will be described in detail based on illustrative drawings.

As shown in FIG. 1, the suction head t212. e-pot (31 and molten metal in the tobee car (4)
Place it close to the slag (6) floating above, and select the slag? The slag is sucked together with air, and the cooling water supplied from the cooling water supply pipe (61) is ejected into the suction head (21) to solidify the suction slag into powder.

Then, the solidified slag, excess cooling water, air, and steam generated during cooling are all in a three-phase state, and the suction pipe (7) is fully valved to be vacuum transferred to the separator (8).
The air and water vapor separated from the solid and liquid components are transferred to a condenser +91VC to remove condensed water. (While suctioning and discharging with +o+, capacity, separator (8rrtc It is iCn&nashi to do.

The suction head +21 [I1, sensor 03 consisting of an electrode rod for detecting the thickness of the slab] is equipped, and the sensor t131 with the lower 11.6tζ of the suction head (21) comes into contact with the upper slab (5) of the molten metal. When I did that,
When reaching the spoon, that is, the suction head (21 is the set suction height ■ea) in the suction operating state, the automatic controller 0 pulls the suction head (2) based on the information from the sensor 031 (σ). It is configured to automatically stop, retract the sensor (13) upward, and start slab suction.

Then, the sensor IJ:! The slag level is changed horizontally by IK, and based on the detection result, the setting suction part is adjusted as the slag level decreases. The suction head (2) is automatically lowered to maintain a steady state of slag suction.

The cooling water supply system 4 consists of cooling water '1' sold separately to a water supply system kjU51 consisting of a cooling water supply pump.
t6+ &C5? tif, lj meter (I61, constant rAi
M valve an, 7JtU, electromagnetic opening/closing 7I-(I81 curved eζ is installed, and a valve for constant flow rate fFQ71 is installed.
The f-bus line (19) is fully equipped with a pulse valve consisting of a dynamic variable flow rate valve. And, in conjunction with the manual operation to start the suction operation for the suction head (21), the water supply device 17Q5+
At the same time, the electromagnetic on-off valve O (to) is opened and operated, and the vacuum level detected by the 0-air sensor (l) attached to the suction part of the intake equipment (lO) is detected by the suction in the suction pipe (7). By adjusting the amount of cooling water, the temperature is maintained almost constant from just before the slab suction to the slag steady suction table. t:
While feeding and packing, and based on the detection of slag suction foreshadowing by sensor 03:
4) to control the adjustment IIJ.

As a result, as shown in Figure 9 and Figure 8, the amount of slag suction is 11h 1ffffi gfl The cooling water of the suction head 121-1 in VC is e'<#; f W
Initial state where only air and cooling water are suctioned and transferred by making the steady supply larger than 1m (oa) by the tJ total constant flow valve Q71] suction of υ/, 7 (7) The pressure loss at the cooling water flow resistance The initial suction force of the duction head (21) is reduced in advance to approximately the same level as the slag 1 sweet suction force IB. Sudden increase in air suction resistance due to approach to slag?Suppressing the suction system path, the slag becomes smooth when the collapse fVl is shown by the English line in Figure 2. After the sensor (I3) detects the slag suction, the valve is gradually closed and the cooling water amount (Q) is adjusted to the steady water M (Qa). As the cooling water decreases due to the transfer, the suction slag 5 is replaced with the suction slag 5 while maintaining the vacuum level 1 almost constant until the suction slag fGl reaches a steady yield (C++). By smoothly increasing VC, the slag (goods) pull is transferred to one constant IW-shaped island.

In the first aspect of the present invention, instead of automatically adjusting the cooling water supply ii, the cooling water supply ii may be manually adjusted.

Further, in the second invention, various types of pulps can be used as the pulp for changing the cooling water supply amount (Ql), and the cooling water supply amount (Ql) can be changed to The device r,'i 051 is also capable of various improvements.

To my father, the slag on the common bath (6) of the tuction head (2)
The sensor 1131 that detects the height (1) can be used with various types of contact-type or thermal contact-type sensors instead of an electrode cage. Information from V (based on the Harz”'l
k LJ fill m make 81 equipment u tD
JQ physical 11 f + 71: 't is also an improvement of I-Tei. Kawahara.

・111be 1 song 1-11 6shi IL month 1〈+ 1h lo 1 light lJl lute related molten metal slag removal method and an example of the device o? For example, FIG. 1 shows an outline of suction of slag 1
18 series ki'6 diagram, orchid 52 diagram-1. Changes in degree of vacuum 1
−? The graph shown in FIG. 658 is a graph showing the change mk of the cooling water supply amount and suction slag bi.

]2)・・・・・・-Naction l\tsudo, 1・I)・
...Hot water resistance, (6)...Slag, lul...
...-Intake device, O3...Sensor, O4
1... Controller, O5)... Water supply device,
(Ql... Cooling water supply amount.

Claims (1)

[Scope of Claims] (D. A molten metal slag removal method in which the slag on the molten metal (41) is sucked together with air into a suction head (21), and the slag is solidified with cooling water in the suction head (21), The suction head (21) immediately before starting slag suction by the suction head (21)
), and after the start of slag suction, the cooling water (1 Suction head (2) Vζ, intake system f, 11101
(+- connection and the slag is solidified in its suction head (2) and supplied to the bath water slag connected to Ifa Suiso Co., Ltd. (151), The height t of the suction head (2) relative to the molten metal slag (6)
Output sensor +131. And, a valve is provided to change the cooling water supply h1 from the water supply facility 05), and depending on the information from the sensor 031, it is determined whether the water is before the start of slag by the slag head (2) of No. 011 or after the start of slag suction. Kakai f! As the cooling water supply ff1lQ) increases immediately after the start of slag suction and slag suction starts, the cooling water supply Ml m (Q
A molten metal slag removal device is provided with a $ controller α which automatically operates the pulp (21) i so that l is reduced.