JPS5832556A - Powder additive for continuous casting - Google Patents

Abstract

PURPOSE:To provide a powder additive for continuous casting which contains many amorphous components and is advantageous for operations by pulverizing the solidified slab obtained by quickly dry-cooling molten blast furnace slag to specific grain sizes and contg. specific contents of the fine powder slag. CONSTITUTION:Molten blast furnace slag 2 is held at about 1,400 deg.C in a ladle 1, and is dropped from a downflow spout 3, to which air from a blower 12 is blown through a nozzle 4 at about 50-200m/sec wind velocity to cool the slag and to force the slag to collide against the collision plate 6 in a cavity 5, whereby solidified slag 2a is obtained. The solidified slag is pulverized to 32-400 meshes to fine powder slag. Such slag is added at 45-70wt% to a powder additive, whereby the desired powder additive for continuous casting is obtained. A powder additive consisting essentially of Na2O-CaO-SiO2 is preferable for the powder additive which is a base material.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to powder additives (powder casting aids, refining agents, or coating agents) that are added to the in-mold surface during continuous casting of high, medium, and low carbon steels, silicon steels, and stainless steels. (also called) busy-related.

When continuous casting of well-known through steel is carried out, an easily meltable powder additive is added to the surface of self-melting steel in the mold to cause non-metallic inclusions and deoxidation products to coagulate and dissolve, and at the same time to slow the cooling in the mold. l1
Li% molten steel surface oxidation prevention, shell and fIka! Performs lubrication with the inner wall to ensure smooth continuous casting! - It has the effect of preventing surface defects caused by roughness, plowholes, non-metallic inclusions, etc.

810 is a powder additive that has been used recently! -C!
10'−'Nag Ot- principal component, and BxO
s, ``Fluoride, Fe1O1, aged appropriately to 0 etc. and adjusted in viscosity and interfacial tension when melting in a 1L bath, and added to C, BN, etc. to adjust the residual melting speed and km. There are things to do.

Each of these is used according to its purpose, but -
Recently, there has been a trend towards continuous casting of □, which aims at high productivity and adopts casting speeds, and conventional powder additives are unsuitable for the metal purpose, and powders suitable for continuous casting are being used. Additives become desirable friends.

The present inventors worked together to solve the problems of more stable operation and faster drawing of continuous casting, and found that conventional powder i-machining consists mainly of crystalline materials, which melt and become amorphous. When melting, it absorbs heat and is called Vt-difficulty-1 in controlling the melting rate. As a result of the development of a powder additive that is advantageous for public use and operation, the powder additive t-
To emit a message [I succeeded.

That is, the gist of the present invention is to provide a powder additive containing pulverized slag obtained by dry-quenching molten blast furnace slag and pulverizing it into solidified slag T-32 to T-400 mesh in a weight ratio of 45 to 70. It is.

Although the present invention is characterized by containing a large amount of blast furnace slag, methods that simply use blast furnace slag as a powder additive are already known.
No. 46-451197 K1g1, all of which are crystalline blast furnace slags that have been water-cooled in natural cooling tunnels, and are suitable for high-speed continuous casting (e.g., drawing speed [ 1.2 m/min or more) is not a powder additive.

This method uses a dry quenched solidified slag with a very high amorphization rate.
According to the invention disclosed in No. 6-7982 No.
The present invention relates to a manufacturing method, and more particularly, to a method for efficiently manufacturing granule slag of uniform quality and a dense structure that is highly useful for various purposes from molten blast furnace slag.

As an attempt to effectively utilize blast furnace slag, which is produced in large quantities as a by-product during blast furnace operation, it is already well known to produce granule slag by blowing high-pressure gas such as air or steam onto molten blast furnace slag.

However, in the previous method, the melted 7c Inn
SlagThe blast furnace slag that has been blown away with high-pressure gas is generally rapidly cooled with a quenching medium such as water, so a high proportion of the blast furnace slag becomes fibrous slag rather than granule slag. Even if it becomes a grain slag, it has many pores and the surface is angular and tends to stop expanding.
There were many problems with strength, and its range of use was also limited.

Therefore, the present method solves the technical problems mentioned above, and the method will be explained below according to the embodiments.

Figure 1 shows one of the methods! FIG. 2 is a cross-sectional view of the structure of a slag manufacturing apparatus showing an example of weaving. - is a ladle for storing the molten blast furnace slag 2], and a KFi flow down trough 3 is provided below the mosquito ladle 10. #i spray nozzle 4 at the lower part of the flow @3
is installed, and air flows into the blast furnace slag 2 flowing down from the blowing nozzle 4 and downstream 413! By blowing, the blast furnace slag 2 is scattered in the wind tunnel 5 and granulated to become spherical or nearly spherical slag 21. Grain slag 21 is inside wind tunnel 5! It is cooled while flying in the air, collides with an arch-shaped collision 6 provided at the rear end of the wind tunnel 50, and is sucked into the outlet pipe 7 together with a carrier gas, which will be described later. In the wind tunnel 5 and the outlet pipe 7, the blown air by the induction fan 8 and the air sucked into the open part 5m of the wind tunnel 5, or the conveying gas, etc. that is forcibly supplied to the wind tunnel 5, which will be described later, are mixed into the particle slag 2. It is pulled in the direction of the arrow Kll as a carrier gas for transporting heat. The grain slag 2a drawn together with the carrier gas through the outlet pipe 7
The slag is further cooled by the carrier gas and taken out to the separator 9, where it is separated from the carrier gas, and the separated 9-grain slag (2 m) is passed through the cutting goose 10 provided at the bottom of the separator 90. The carrier gas is collected in a timely manner, and the carrier gas is discharged into the atmosphere via the induction pipe 11t.

However, in the production of the grain slag 21, high quality grain slag 2
aKKFi, the type of gas to be sprayed from the spray nozzle 4 a
I. Conditions are an important factor in spraying.

Conventionally, water vapor has often been used as a blowing gas because high pressure can be easily obtained in large quantities, and the pressure has generally been as high as 5 to 4 I/- or higher. However, #1 steam is expensive, its handling is extremely poor, and there are many safety problems.Furthermore, when the pressure is high, the proportion of water vapor that becomes slag rather than slag as mentioned above is high. It was expensive and impractical.

In order to solve the conventional problems, this method focuses on air that is easy to handle and can be obtained at low cost, and was obtained as a result of various studies to effectively utilize dead air. It is characterized by the fact that when it is sprayed at a flow rate, a significant effect can be obtained and tM is %4.

That is, air is supplied from the blower 12 as shown in FIG. It was confirmed that by uniformly controlling the speed of the O air when it is blown out from the spray nozzle 4, a particle slag 2a of image quality can be obtained.

Figure 2 shows the solid line results when grain slag 211 was produced using the apparatus shown in Figure 1! Mine slag due to changes in wind speed
This shows the 5O generation rate.

As can be seen in Figure 2, when the wind speed is low, the generation rate of slag is low and, however, when the wind speed is below a certain level, the blast furnace slag 20 cannot be effectively scattered and the blast furnace slag 2 becomes granulated. (Many untreated slags fall to the bottom of the wind tunnel 5), making efficient production difficult. On the other hand, the problem of unprocessed slag caused by roaring wind speeds can be solved, but a lot of slag wool is generated, and when collecting slag 2a, a special method is required to remove the slag wool beforehand. (required), suction resistance of the carrier gas is also large), and the capacity of the induction fan 80 is also required to be large. However, at high wind speeds, there are relatively few restrictions on the production of grain slag 2 heat, but the wind speed! In order to keep the speed above a certain level, K requires a blower 120 whose capacity is very large, and in extreme cases a compressor is required, making it difficult to secure the necessary air volume, and making more noise when blowing. And many more problems! There was almost no difference in the quality of the 2 m of granule slag produced from that obtained at low wind speeds.

Based on the results of the solid line mentioned above, we have conducted various studies to prevent the generation of untreated slag and minimize the generation of slag wool.As a result, we have found that if the wind speed of the blown air is in the range of 50 to 200 m/km, the slag wool The occurrence rate is suppressed to 15 or less, no special means or equipment is required for removing the slag, and the slag 21 with a dense structure can be efficiently obtained without the generation of untreated slag. It can be confirmed that the wind speed is 50 to 140 m/s.
When the ec was within the range, the generation rate of slag wool could be reduced to about 1l12-, and furthermore, when the ec was within the range of 50 to 100 m/sec, there was almost no slag generation and it was very effective. In addition, the air volume at the spray nozzle 4 at this time is ^
It has also been established that a value of 20 to 50 −/− is sufficient for the furnace slag IT/H.

Now, the temperature FiM1 of the blast furnace slag 2 flowing down from the downflow gutter 3
F1a Naturally, it must be within a range where it does not solidify at the flow rate IIj 3 yen, but even if solidification does not occur, if the temperature is too low, the viscosity of the blast furnace slag 2 will increase, and the blown air at the low wind speed will cause the mineral layer of the granule slag 21 to increase. Problems such as excessive p and the generation of a large amount of unprocessed slag occur. Moreover, if the temperature of the blast furnace slag 2 is too high, the viscosity will decrease, and there is a concern that the generation rate of slag will increase. Therefore, it is sufficient if the 1ifa of the blast furnace slag 2 flowing down from the downflow gutter 3 is about 1400°C, but if the at of the blast furnace slag 2 is low, for example, the temperature of the pot 1 or the downflow gutter 3t-
It is necessary to control the temperature to 1600° C. or higher by using a well-known burner to retain heat.

The granulated slag 21 that has been blown off by the low-velocity blown air from the blowing nozzle 4 is stored in the wind tunnel 5 to prevent it from re-melting.
The open part 5ax is cooled by the air sucked in.

Although the wind tunnel 5 of the Meikoji example shown in FIG. Of course, the air tX may be supplied as an inert gas or the like, and the cough conveying gas and the blown air may be suctioned by the induction fan 8, and the particle slag 2at may be cooled and conveyed.

By the way, the blast furnace slag 2 is blown away and granulated into granules 2a.
The process of cooling without causing re-fusion is very important in determining the quality of the grain slag.

That is, in the conventional method, the grain slag 2Jlk, which is in a high temperature state immediately after being granulated, is usually immediately dropped into a water tank or cooled by a quenching medium in a water film cape. For this reason, it is thought that when the grain slag 2au was cooled, it was easily absorbed and turned into expanded slag with a porous structure.

The method of producing solidified slag according to the present invention is to fly the granulated slag 2m in the air for a set distance using the propulsive force of the blown air and the suction force of the carrier gas immediately after being granulated. One of the features is that the surface 11jfk is lowered to below the solidification temperature. Therefore, in order to effectively carry out this method, the blast furnace slag 2 flowing down the downflow gutter 3 must be
It is necessary to control the direction in which the particles are scattered and to blow them as far as possible.

FIG. 3 is a side view showing an example of the structure of the blowing nozzle 4 and its installed state, and is a multi-stage blowing nozzle 4a in which the position of the blowing outlet of 4 ml of 9 air is shifted in stages with respect to the flowing blast furnace slag 2.
f. Air outlet 4 of the multi-stage spray nozzle 4a
The width in ml is slightly wider than that of the flowing down blast furnace slag 2, and is 10 mm with respect to the center at horizontal IIIK of the multi-stage spray nozzle 4a.
If the inclination angle I is in the range of ~45 and it is mounted upward, the flight distance will be long and the diffusion effect will be very good.According to my experience, in order to satisfy the above conditions, it is better to use the present example when there is only one KFi outlet 4. It has been confirmed that multiple doses are more effective.

The structure and size of the wind tunnel 5 may be appropriately determined in consideration of the scattering range of the particle slag 2a, the cooling capacity, etc.

Now, as mentioned above, the particle slag 21 that is scattered in the wind tunnel 5 by the blown air is collected and conveyed in the outlet pipe 7 together with the carrier gas. In order to collect the slag 2aYr efficiently, an arch-shaped collision plate 61r with a surface polishing force or a water-cooled structure is provided at the end of the wind tunnel 5, and the slag 2a scattered on the carcass collision plate 6 is collected.
The particle slag 2a and the transfer gas were caused to collide and fall, and the flow resistance t of the carrier gas was reduced to cause the particle slag 2a and the transfer gas to be sucked into the outlet pipe 7, which has a high flow rate. That is, by suctioning the carrier gas,
As mentioned above, the 2 m of particle slag that has been widely dispersed in the wind tunnel 5 can be easily collected in the outlet pipe 7, which has a relatively small diameter. It can be made compact, and the wind tunnel 51i does not have a completely sealed structure, making it efficient even when there are many gaps.
Numerous effects were recognized, such as the production of 11141f-.

In order to minimize the possibility that the flying distance of the two grain slags may not reach the impact plate 6 and fall to the bottom of the wind tunnel 5 on the way, causing re-fusion noise and/or being unable to be recovered, the damage shown in Fig. 1 is shown in Figure 1.・Forcibly feed air or an inert gas such as N as a carrier gas from the supply nozzle 13 along the bottom and side surfaces of the wind tunnel 5 as shown by the line, or to the lower part of the wind tunnel 50 as shown in FIG. It is preferable to provide a vibrating feeder 14 and convey the fallen grain slag 2at to the inlet of the outlet pipe 7 by the vibrating feeder 14.Also, in some cases, a hopper may be installed at the bottom of the wind tunnel 5, although not shown. There is no problem and it is effective to provide one and separately collect it from the bottom of the hopper.

The carrier gas refers to the blown air, the open part 5m of the wind tunnel 5
This is a general term for air sucked from gaps, etc., and conveyance gas supplied inside the wind tunnel 5 or along the bottom and @ plane of the wind tunnel 50.

In the practical example shown in FIG. 2, air at room temperature is used as the blown air, and as the carrier gas, the blown air at room temperature and the air at room temperature sucked from between the open section 5m of the wind tunnel 5 and KH, etc. However, the surface temperature of the grain slag 21 when it collides with the terminal part of the wind tunnel 5, that is, the balance plate 6 and falls, is about 1
The temperature dropped to about 100°C, and at this point, it was confirmed that 2 m of grain slag was almost completely formed.

Note that the length of the wind tunnel 5 in this embodiment is 13 m, and the lead-out pipe 7
When the grain slag was taken out from the separator 9, the temperature of the 2 m slag had decreased to about 750 to 800°C.

The handling of the granule slag 21 taken out from the separator 9 is extremely good and workability is good, and the granule slag 2a recovered in a high state can be taken out through the heat exchange equipment 1st as shown in Fig. 5. K], industrial thermal yield becomes possible.

The surface temperature of 2 m of grain slag at the end of wind tunnel 5 is approximately 1100°C.
If the level is below that level, for example, the particle slag 2 may
Even if the cooling effect is increased by watering at m, the grain slag 2
There is no effect on the quality of m, and the length l of the outlet pipe 7
Other examples have shown that it can be shortened and is particularly effective in processing large volumes.

Now, the following Tables 1 to 3 show the physical properties of the slag 21 obtained by this method, and Table 1 shows an example of the particle size distribution of the slag 21 and natural sand (Kagawa Sea sand of Muroki Island)
The particle size distribution is compared with the particle size standard of the Japan Society of Civil Engineers.

It was found that the slag of the present invention is a new composite material that is not known to be used as a material.Furthermore, the slag of the present invention is more homogeneous and powdery than a lumpy slab that is prone to breakage. It is passed as an additive.

Tables 2 and 3 show comparisons with vlJ physical properties of natural sand, water slag, etc., in order to clarify the physical properties of grain slag 2a CD according to the present invention, and the value of grain slag or base grain slag for grain slag. and six dark contrasts to the picture aggregates used for civil engineering.

Table 2 The standard values in Table 2 are civil engineering standards (as sand).
bl.

Next, Table 3 shows the flow fl! with the water and cement ratio constant!
These are the results of a mortar test that tested to what extent the 2m of bone facies, the 2m binding method of the present invention, and sea sand can be used, with I being a control value for measuring workability.The flow value increases when the 2at of granular slag of the present invention is used. Therefore, it can be seen that by increasing the amount of aggregate and suppressed slag by 2s per unit amount of cement, conversely, it is possible to save cement.

The example in Table 3 is an example to prove that the solidified slag referred to as unexploded slag has % different properties and is completely different from the conventional so-called granule slag.

The solidified slag produced by dry granulation by blowing away the molten blast furnace slag gas referred to in Misexplosion 94 has a dense structure as shown in Table E1 [I
It has a smooth spherical shape or a shape close to a spherical shape, and because the grains are agitated, it has the above-mentioned special properties.

The results of component analysis (electrode type %) of the solidified slag finely pulverized to t200 mesh or less are shown in Table 4.

In the present invention, 1 m of molten Ofuro slag is placed in a shallow dish mold with a built-in heat medium circulation system developed by one person.
It is recommended to adopt a method of obtaining solidified slag with a vitrification rate, that is, an amorphous ratio of 70% or more, by soaking the slag to a thickness of 100 mm or less and rapidly cooling it.

Next, the results of investigating the amorphous bonding rate (hereinafter also referred to as vitrification rate) for each grain of the grain defects produced by the cylindrical grain method are shown in the fifth section.
Shown in the table.

Table 5 In any case, the vitrification rate was 73% or more, and the quality was suitable as a powder bed additive.

Here, the vitrification rate is the glass v111 ratio expressed as a percentage by observing the pulverized artificial Mion 88-62/LVC under a polarizing microscope to distinguish glass from crystal.

V, the grain slag obtained by this method! -1iI! V) The crushing rate is extremely low.In contrast to q), the crushing rate is less than 0, and the 0th order 6th gen has hard and agile physical properties. Comparison of crushing powder (%) &) An example is shown below.

The pre-distribution crushing rate is the particle size in the mode of 150φ and 150 mouths! The song's Nobuhiro Hara is dressed lightly, and a ton of blood is recorded.
After maintaining 5s6C, test pieces were taken out and crushed to a size smaller than the normal grain size range, expressed as a percentage.

Table 6 As is clear from Table 6, the artificial sand of the present invention has a crushing rate superior to that of river sand heated by fire; There is no actual example of such granule slag being supplied on an industrial scale.The specific gravity of this issue 6&rc is shown in Table 7, comparing the absolute dry specific gravity.

Table 7 The grain # of this method has a high ratio of 1, which is comparable to that of grains outside the converter (with a high FeO content) (in this example, 4
Although only the fine grains obtained by crushing the blast furnace filtrated with 8) % slag are allowed to stand naturally, the wrinkled fine grains are compared to the granule slag obtained by this method, as is clear from the crushing rate table in Table 6. and increase the brittle physical properties to 11.

Next, the relative softness of the unit body 111k (1#/m') was determined on the 8th evening.
The ratio of water absorption (%) is shown in the table.

From Table 8 and Table M9, it can be seen that the grain slag produced by this method has extremely low water absorption and is large in unit size. In other words, as is clear from these physical properties, the surface of the grain slag produced by this method is very smooth, and there are no surface defects such as air bubbles, and the water absorption rate is as low as 1/A, and the quality is poor and dense. It is.

In addition, the surface of the p#i slag of this 'yi method is smooth and curved, and many of them have a shape that is almost spherical, and the surface looks like glass work! It has a lustrous luster, and its surface does not have any sharp edges, flat circles, or single-toothed irregularities.

Next, the analysis of the soil components of the grain slag is shown in No. 10 #2 below.

Table 10 % Next, powdered a71Il agent for continuous casting will be described. As mentioned above, the II is sought after for machining powdered wood! The characteristics are as follows.

(When adding thlK to the l-bath, it separates into a molten slag layer and a young wood layer, and the molten slag layer absorbs and dissolves intervening substances such as scum, etc., and the first wood layer has #j @It must be able to keep the slab layer and molten steel appropriately warm and melt them properly.

(2) The molten slag forms a uniform thin film layer in the gap between the mold and the solidified shell, and has the function of providing appropriate lubrication when the slab is pulled out due to mold onration.
Be something that you have.

(3) The slab film that exists between the mold and the fell is necessary because it prevents local concentration of cooling from the mold on the shell.

As powder bed additives, there are those with extremely low quality, or those with influence on heirs or environmental considerations, such as 1NalO-OaO-
It is more preferable to use the main component as the main component, and this v94 has the same basic tone.

Meanwhile, powder milling with ingredients such as O' is produced using the following raw materials.

8401 is pregnant stone, glass, perlite, and siliceous earth.

Hula (7 Tsushie, obtained from Nrika Flower) n,.

OaO is obtained from lime, calcium heptadide, carunium carbonate, portland cement, dicalcium hydrate, wollastonite, carunum borate, etc., and Na1O is obtained from carbonite powder, sodium heptatide, sodium silicofluoride, sodium teluofluoride, etc. Glass, sodium silicate, etc. can be used for 110 m of mullite, fluminomen (sodium alkyl acid), soil, lead, activated carbon, charcoal, power black, oil. Obtained from black, coke, etc.

Experimental example of first ice and additive cutting related to the development of this company, etc. f: Not shown in the following Omtt table. 1, experimentally 0.6 <
OaO/84on < 120.15 < Na@O/
It seems preferable that 810 < 0.35. That is, when the viscosity and melting point of the powder additive are within the above range, it exhibits favorable physical properties.

Therefore, the viscosity of 110g/810m% and the melting point are supplemented.

Also, Nuda glass is 810. Perlite (same percentage of diatomaceous earth) is also used as a coating agent for the same purpose.
*OOs b Na P s N 81mm 1F- is mainly used as #14m cutting of melting point, and 0 is used as melt @ retardant and sintering prevention net.

Now, since the powder additive in the present invention has a high amorphization rate, it is easy to ffj@ when the powder machining itself becomes higher temperature, and the bath speed can be controlled very easily by pre-coating. On the other hand, in the case of conventional materials with high crystallinity, the vertical rise in the powder state results in severe heat dissipation when handled at high temperatures, and an endothermic reaction occurs during melting, so it is necessary to control the melting rate in advance. (Foundation) is in extremely poor condition. Ii
+1, the thermal conductivity of crystal 1 is 10 K Cal/h
Compared to r, m, deg, that of amorphous indigo is 0. g
K Oal/hr, rn, deg.

Now, in the present invention, fine powder slag t45 to 75% (weight%
) If the embedment is less than 45X, the viscosity cannot be adjusted and poor lubrication occurs, and if it is more than 75%, crystallization occurs, which also causes poor lubrication and uneven cooling between the mold and the shell. This is because cracks occur in the slab, which is easy to crack.

Sara KN Gen 001 preferably has a gradual cam of 5% or less.

This is because if the temperature exceeds 5%, it tends to cause an imbalance in heat conduction due to the formation of bubbles.

'ei: The reason for choosing a particle size of 132-400 mesh is that if the particle size is larger than 32 mesh, the heat transfer rate of the powder additive is 4! 0.5 koal/hr', m, deg VCsuvkaH'jVc, the melt surface becomes hardened easily,
Do not use it as it may cause casting trouble. In addition, 4 (If the particle size is smaller than 10 meshes, the manufacturing cost will be large and the effect will be saturated.) According to the M theory of the Ministry of Non-Invention, etc., it is more preferable to use 200 to 300 meshes. 13) At 200 mesh to 300 mesh, the thermal conductivity is, for example, 0.1 KOIJ/hr.

m, d, e, g, and the heat retention effect was good.

The effects of powder machining according to the present invention K were as follows.

Weaving Example 1 A 170 ton converter was used to smelt the material, and a water-cooled assembling mold was used to cast a 10,100 O thick 250 mm thick material at a rate of 150 mW L 4 to 1.8 m/min.
0 tons [I cast it, but no troubles occurred at all.

Matsumoto #S machining at this time had a composition of 4(
1) l was used.

*1 Example 2 Melt fII4t-m in a 170 ton converter and make a water-cooled assembly mold. 1iL length 250m
Lower order flKa'k l casting f8i L 6~L
X5 was cast at 8 m/min (1200 m/min), but there was no occurrence of slab cracking during breakout.
(Na power) Ivy, the powdered wood and glass processing used at this time was Atsushi 11 Table 2
For use with the composition shown below.

When crystalline blast furnace slag was continuously cast using a powdered floc agent mixed with D in the same proportion as in the present invention and other ingredients were the same, the maximum casting withdrawal speed was L Orn /τnia. , above rL, it cannot be used due to breakout and υJTL.However, if the powder of the present invention h≦machining and fc, the maximum speed is #IIE1.8 min as described above.
It was possible to raise it to n.

[Brief explanation of drawings]

Figure 1~#! Figure 5 shows an actual example of the production of the grain slag used in the present invention. Figure 3 is a diagram showing the results of the ratio of slag generated as a result of changes in the wind speed of the gland in which the product was manufactured. Figure 4 shows the wind tunnel -! lIi! Figure 5, which shows an example, is a partial diagram of an example of a grain slag collection device. In the figure, 1: $pot, 2: blast furnace slag. 2a: Grain slag, 3: Drifting slag. 4*4a: Spray nozzle, 4al: Air outlet. 5: Wind tunnel 5a = open part. a: @ veneer, 7: outlet pipe. 8: Attraction 7 completed, 9: Separator lO: Cut out), 11: Attraction tube. ]2 Ni blower, 13: Supply nozzle. 14: Vibration feeder, 15: Thermal climate equipment a: Exit direction of conscripted gas. #: Installation angle of spray nozzle. Agent Masu Tanshi Aki Sawa Shu Mitsuru and 2 otherstt' Ke 2 figures

Claims (1)

[Claims] (1) Solidified slag obtained by melting → furnace → dry quenching t The percentage value is the weight ratio of the fine powder slag obtained by pulverizing to 32 to 400 mesh ÷ the grain containing 45 to 70%. Powder additive for continuous casting.