KR100649939B1 - High frequency heating equipment and melting method - Google Patents

Abstract

The present invention provides a crucible comprising a side wall portion and a bottom portion having a cooling device through which cooling water flows, and a high frequency generator for heating the inside of the crucible while moving along the vertical direction of the crucible at a spaced apart position outside the side wall portion of the crucible. In the high frequency induction heating device is configured to include, the cooling water flows into the cooling unit of the side wall via the cooling unit of the bottom portion is configured to flow back to the bottom portion, the cooling unit of the side wall portion is composed of a plurality of individual pipes It provides a high frequency induction heating apparatus, characterized in that the pipe is detachably coupled to the bottom.

In addition, the present invention, the step of filling the raw material powder in the crucible (S1), the step of melting the raw material powder in the crucible with a high frequency generator (S2), and the step of discharging the molten melt in the step (S3) In the melt manufacturing method using a high frequency induction heating apparatus comprising a melt using a high frequency induction heating apparatus, characterized in that the heating step of the melt filling step (S1) does not react with the melt and a high calorific value per unit time. It provides a method of manufacturing.

Description

Manufacturing method of melt using high frequency induction heating device and high frequency induction heating device {High frequency heating equipment and melting method}

1 is a schematic longitudinal sectional view of a high frequency induction heating apparatus according to the present invention;

2 is a partial perspective view of a crucible equipped with a high frequency generator and a side wall of the crucible in detail;

Figure 3 is a schematic exploded perspective view for explaining the installation state of the cooling pipe provided in the crucible,

4 is a single perspective view of the high frequency generator;

5 is a process flowchart conceptually showing a process of melting a melt, such as lead-containing glass, using a high frequency induction heating apparatus.

* Explanation of symbols for main parts of the drawings

10 crucible 11 side wall

12 Bottom 13 Insulation layer

14 Cooling pipe layer 15,16 Inlet and drainage pipe

20 High Frequency Generator 30 Melt Discharge Part

36 Insulation 35 Bottom Table

40 Raw material powder supply device 50 Heating material

The present invention relates to a method for producing a melt using a high frequency induction heating apparatus and a high frequency induction heating apparatus.

There are various known apparatus and methods for producing melts.

Among them, Korean Patent Publication No. 2002-0038734 [Title: Skull port for melting or refining glass or glass ceramic] is selectively installed at various positions around the outer wall of a cylindrical crucible composed of a plurality of pipes, and is a powerful high frequency material for melting in the crucible. Disclosed is a short circuit wherein the melt is more strongly heated by forming a field.

In addition, Korean Patent Laid-Open Publication No. 2002-0038727 [Title: Skull crucible for melting or refining inorganic materials, in particular glass and glass ceramics], to extract the melt in the hot area of the crucible to improve the quality of the glass crucible Disclosed is a technique of protruding a predetermined height into the crucible at the bottom to form a sleeve and a mantle.

In addition, Korean Patent Laid-Open Publication No. 2004-0015249 (Title: Furnace having an induction coil at the bottom) discloses a technique for heating the bottom of the crucible by providing a magnetic flux concentrator and an induction coil at the bottom of the crucible.

In addition, Korean Patent Application Publication No. 1994-0008833 [Method and Apparatus for Manufacturing Jeonju Refractories by Induction Heating] has a bubble-free, dense and homogeneous crystal structure, as well as a device for producing an oxidized Jeonju refractory; There is disclosed a process technology for producing a pole refractories using this apparatus.

Currently, there are various fields for producing or extracting melts using the above known apparatus and methods. Among these various fields, especially in electronic fields such as semiconductors, the generation of high purity melts is more important than in the prior art, and in order to generate such high purity melts, there is a need for improving the above-described prior art.

The present invention has been made in view of the prior art and the need for a high-purity melt. The raw material contained in the crucible is rapidly melted to form a melt, and a sintered layer is easily formed inside the crucible, It is an object of the present invention to provide an improved high frequency induction heating apparatus capable of producing a product of high purity since the chemical reaction due to the contact of the reaction is suppressed and the melt can be easily extracted in the hot portion.

It is also an object of the present invention to provide an improved high frequency induction heating apparatus provided with a cooling structure capable of cooling the side wall and bottom of the crucible in order to easily form the sintered layer.

In addition, since the present invention manufactures the cooling pipe layer of the crucible in a detachable unit structure, an improved high-frequency induction heating apparatus which can easily solve the problem (for example, replacement of individual cooling pipes) when a cooling circulation problem occurs. It aims to provide.

In addition, the present invention provides a method for producing a melt of high purity without using preliminary heating (described in Korean Patent Publication No. 2002-0038734) previously performed by using a separate heating device by using the improved high frequency induction heating device. For the purpose of

In order to achieve the above object, the present invention, the crucible consisting of a side wall portion and a bottom portion provided with a cooling device in which the coolant flows, and while moving along the vertical direction of the crucible at a position separated from the outside of the side wall portion of the crucible In the high frequency induction heating apparatus comprising a high frequency generating device for heating a, wherein the cooling water is introduced into the cooling unit of the side wall via the cooling unit of the bottom portion is configured to flow back to the bottom portion, the cooling apparatus of the side wall portion Provided is a high frequency induction heating device comprising a plurality of individual pipes, the pipes being detachably coupled to the bottom.

In addition, the present invention, the step of filling the raw material powder in the crucible (S1), the step of melting the raw material powder in the crucible with a high frequency generator (S2), and the step of discharging the molten melt in the step (S3) In the method for producing a melt using a high frequency induction heating apparatus, the high frequency induction heating apparatus, characterized in that the heating step of heating the molten material per unit time without a reaction with the melt in the melt filling step (S1). Provided are methods for preparing the melt.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

1 is a schematic longitudinal sectional view of a high frequency induction heating apparatus according to the present invention. The high frequency induction heating apparatus according to the present invention has a vertical cylindrical shape and a crucible having cooling means in the side wall portion 11 and the bottom portion 12. (10: scull crucible) and the high frequency that surrounds the outer circumference of the side wall portion 11 of the crucible 10 in a ring shape and moves up and down in the side wall portion 11 of the crucible 10 along the guide. The generator 20, the melt discharge part 30 formed in the bottom part 12 of the crucible 10 to take out the melt melted from the crucible 10, and the raw material powder 41 in the crucible 10. ) Is provided with a raw material powder supply device 40 for filling.

Here, the side wall portion 11 of the crucible 10 is composed of an outer heat insulating material layer 13 and an internal cooling pipe layer 14, which is provided at the bottom portion 12 as the cooling pipe layer 14. Cooling water injected through the inlet pipe 15 is filled to the inside of the bottom portion 12 at the same time is introduced into the cooling pipe 14, it is configured to be discharged back to the drain pipe 16 through the bottom portion 12. In the figure, the crucible 10 has a cylindrical shape but can take a rectangular or polygonal pillar shape, of course.

In addition, the high frequency generator 20 includes an induction coil 21 for generating a high frequency, a cooling pipe 22 for cooling the coil, and a generator 23 for supplying RF power to the induction coil 21. It is provided. Then, the connecting table 26 for connecting the coil 21 and the cooling pipe 22 structure to the guide 24 guiding in the up and down direction from the side of the crucible 10, and the structure 21, 22, 23 up and down A driving device 25 made of a motor and a gear to move is further provided.

In addition, the discharge part 30 is a skimmer 31 for limiting that the undissolved raw material powder 41 introduced into the crucible 10 is immediately discharged to the outside of the crucible through the sleeve tube 32 and the melted product. It is configured with a sleeve tube 32 for the discharge. Furthermore, there is further provided a roller 33 for slow cooling while pressurizing the discharged melt and a storage container 34 for storing the solidified melt.

On the other hand, the sleeve tube 32 is installed to protrude from the bottom portion 12 of the crucible 10 by a predetermined height h toward the center of the crucible inner space. This protrusion height h is determined according to the position of the melt which is in an optimal state during the melting operation. Reference numeral 37 is a protrusion of the bottom part for installing the sleeve tube 32 at a predetermined height, and a cooling device (for example, configured to extend the cooling device of the bottom part) may be installed therein. In addition, the crucible 10 is positioned with the heat insulating layer 36 interposed on the lower table 35.

Therefore, the induction coil 21 is supplied from the raw material powder supply device 40 to the crucible 10 by supplying the raw material powder 41, in particular, glass containing lead (Pb), and supplied with power from the generator 23. The raw material powder is heated to operate the raw material powder, and the melt melted by the high frequency induction heating is discharged to the lower portion of the crucible 10 through the sleeve tube 32, and is pressurized by the roller 33 to be solidified. By storing in the container 34, high purity solids (for example, glass containing lead) are produced.

On the other hand, although not shown in Figure 1 may be separately provided with a mixing device for mixing the melt produced in the crucible by high frequency heating.

Figure 2a is a perspective view showing in detail a crucible 10 and a generator 20 installed in the crucible of the high frequency induction heating apparatus according to the present invention, a cylindrical heat insulating material layer 13, which is an outer portion of the crucible 10 and the heat insulating material layer A side wall portion 11 consisting of a cooling pipe layer 14 in which a plurality of cooling pipes located adjacently along an inner circumferential surface of (13) are continuously installed in the circumferential direction to have a cylindrical shape, and the cooling pipe layer 14 The bottom portion 12 and the high frequency generator 20 surrounding the crucible 10 are provided with an inlet pipe 15 for supplying cooling water and a drain pipe 16 for discharging the cooling water.

Here, the bottom part 12 is composed of an upper layer 12a and a lower layer 12b, wherein an inlet pipe 15 is connected to the upper layer 12a and a drain pipe 16 is connected to the lower layer 12b.

In addition, FIG. 2B shows a state in which adjacent cooling pipes 14b and 14c are connected to the communicating portion 14a at the upper side of the crucible 10. In addition, the heat insulating material layer 13 of the side wall portion 11 is formed by sequentially stacking the asbestos layer 13a, the rubber band layer 13b, and the gypsum layer 13c to the outside. According to such a heat insulating material layer 13, heat generated inside the crucible 10 is prevented from being dissipated to the surroundings through the crucible side.

3 is an exploded perspective view for explaining the cooling pipe layer 14 and the bottom portion 12 according to the present invention in more detail. In FIG. 3A, a plurality of individual cooling pipes are disc-shaped, with an upper plate 12c and a partition wall of a bottom portion. Since it is installed along the outer peripheral surface of the plate 12d, the state which comprises a cylinder is shown. According to Fig. 3c, the individual pipe 14b extends upwardly from the partition plate 12d and is connected to the pipe 14c by the communicating portion 14a, which pipe 14c extends downward. The state connected to the upper plate 12c to form one cooling pipe having an approximately n shape is shown. A plurality of cooling pipes are gathered to form a cylindrical cooling pipe layer 14 as shown in Fig. 3A.

In FIG. 3B, the upper layer 12a and the lower layer 12b are separated by the partition plate 12d, the inlet pipe 15 is installed in the upper layer 12a, and the drain pipe 16 is installed in the lower layer 12b. Is shown. In addition, a plurality of holes 12e are provided in the upper plate 12c along the circumferential surface, and the intake nipples 12f communicating with the inside of the upper layer 12a are provided in the holes 12e. The partition plate 12d is provided with a plurality of holes 12g along the circumferential surface thereof, and communicates with the lower layer 12b in the other hole 12e of the hole 12g and the corresponding upper plate 12c. A drainage nipple 12h is provided. Here, the installation interval of the hole 12g provided in the partition plate 12d is twice the interval of the hole 12e provided in the upper plate.

According to such a structure, the individual cooling pipes 14 which consist of two pipes 14b and 14c and the communication part 14a can be detachably installed in the bottom part through the nipples 12f and 12h. On the other hand, the coupling between the communication portion 14a and the two adjacent pipes 14b and 14c may be made by welding or may be detachable.

On the other hand, in the above-described conventional technology, the bottom portion for detachably installing the cooling pipes by the nipples 12h and 12f as in the present invention is not provided, and further, the individual cooling pipes are manufactured integrally. Therefore, when an abnormality such as clogging of the pipe pipe occurs, there are problems that need to be cut and replaced for the cooling pipe part in which the problem occurs in order to solve the problem. However, when the cooling pipe is manufactured as a separate unit as in the present invention, when the above problem occurs, the problem can be quickly dealt with by separating and replacing only the individual cooling pipe in which the problem occurs.

Therefore, when the cooling pipe 14 is installed in the nipples 12f and 12h as shown in FIG. 3C, the coolant obtained through the inlet pipe 15 to the upper layer 12a of the bottom part 12 is nipple ( After flowing into the cooling pipe 14 through 12f), it is introduced into the lower layer 12b through the nipple 12h, and is circulated to the outside through the drain pipe 16. Through the circulation of the cooling water, the side wall 11 and the bottom 12 of the crucible 10 are cooled.

On the other hand, the cooling pipe 14 is formed such that one pipe 14c connected to the upper layer 12a and the other pipe 14b connected to the lower layer 12b are spaced apart from each other by a predetermined interval. In addition, the cooling pipes 14a, 14b, and 14c which are adjacent to the pair of cooling pipes are also formed to be spaced apart at predetermined intervals.

In FIG. 3, reference numeral 12i denotes a lower plate of the lower layer 12b, and reference numeral 12j denotes fixing means for fixing the bottom 11 to the lower table 35. In addition, reference numeral 12k denotes an opening for installing the protrusion 37 and the sleeve tube 32.

4 is a perspective view showing in detail a main part of the high frequency generator 20 surrounding the crucible 10, the induction coil 21 for generating a high frequency for heating the crucible 10 and for cooling the induction coil. Support 27 for supporting the cooling pipe 22, the guide coil 21 and the cooling pipe 22, and fixing means for fixing the support 27 to the connecting table 26 shown in FIG. 28 is shown.

Here, the induction coil 21 is formed in a band shape of a predetermined width h1 to enlarge its surface area, and is wound up and down twice, connecting the upper induction coil 21a and the lower induction coil 21b to the connection coil 21c. Has a structure to connect.

In addition, the cooling pipe 22 has a structure that is wound in duplicate on the outer peripheral surface of the upper and lower induction coil 21, respectively. Like the induction coil 21, the cooling pipe 22 also has an upper cooling pipe 22a, a lower cooling pipe 22b, and a connecting portion 22c connecting them, and the upper and lower cooling pipes each consisted of two. .

According to this structure, the heat generated when the induction coil 21 is heated to be generated only to the center of the induction coil 21, that is, into the crucible 10, the heat generated in the circumferential direction is the cooling pipe 22 Since it is reduced by), it is possible to prevent damage to the peripheral device.

On the other hand, in the above apparatus, it is preferable that the cooling pipes 14 and 22 are made of a nonferrous metal such as copper having a low high frequency absorption rate.

Hereinafter, a process of manufacturing a melt by a high frequency induction heating apparatus will be described.

First, the raw material powder 41 in the raw material powder supply device 40 is injected into the crucible 10 through the conduit 42 to fill the inside of the crucible 10 (S1).

Here, the raw material powder injected into the crucible 10 may be a mixture of alumina, silica sand and zirconia (AZS type), high zirconia type, high alumina type, and the like at a high melting temperature. In the present invention, the content of lead (Pb) may be used. It is preferable that it is 20 to 90 weight% of glass, and it is preferable for effective melting to fill about 70% of the inner space of the crucible 10 with raw material powder.

On the other hand, the step of injecting the raw material powder (S1) is a step of filling the raw material powder 41 into the inner space of the crucible 10 approximately 50% (S11), and then putting a plurality of heating material 50 (S12) Next, the step (S13) of filling about 20% of the internal space with the raw material powder. However, in this step, it is preferable to charge the heating material to be located at the same position as the induction coil 21, by using the drive device 25 to the position of the induction coil 21 to the position filled with the heating material. I can adjust it.

Here, the heat generating material 50 is preferably a carbon (C) material that does not react with the glass melt and has a high calorific value per unit time, and fills a solid carbon agglomerate at various positions of the crucible 10 according to a work request. . On the other hand, the carbon agglomerate may be formed in a polygonal, spherical, cylindrical or annular shape.

As necessary, the heating material is preferably made of silicon carbide (SiC), and the solid silicon carbide mass is filled at various positions of the crucible 10 according to a work request. The heat generating material of silicon carbide may also be formed in a polygonal, spherical, cylindrical or annular shape.

Next, the high frequency generator 20 is operated to heat the raw material powder 41 and the carbon heating material 50 in the crucible 10 to melt the raw material powder 41 (S2).

When the raw material powder is filled in the crucible 10, the raw material powder is heated by an induction coil 21 provided in a ring shape around the outside of the crucible 10.

To this end, the induction coil 21 is connected to the high frequency generator 23. The generator 23 is comprised from the power supply part which supplies DC power, and the oscillation part which generate | occur | produces a high frequency power supply. The oscillation frequency of the high frequency generated by the high frequency generator is determined according to the resistance of the melt and the size of the crucible 10, and it can be efficiently melted at about 0.1 to 3 MHz. The high frequency electromagnetic field generated by the induction coil 21 is introduced into the crucible 10 through the gap formed between the cooling pipes 14 forming the crucible 10.

Then, the melting step (S2) proceeds according to the step shown in FIG.

When a high frequency electromagnetic field is initially applied, the molten core 51 is formed around the heat generating material 50 in the raw material powder 41 as shown in FIG. 5A (S21).

As the molten core 51 generates heat at a high temperature, the molten core 51 gradually grows while melting surrounding raw material powder 41 as shown in FIG. 5B (S22).

At this time, almost all of the raw material powder 41 except for the near side and the bottom portion of the crucible 10 where the coolant is circulated through the inlet and drain pipes 15 and 16 and the cooling pipe 14 is not heated. Melted to form a mixed state of the liquid melt 52 as shown in Figure 5c and the raw material powder 41 surrounding the melt 52 (S23).

Subsequently, if it continues heating as shown in FIG. 5D, all the raw material powder inside a crucible will melt (S24).

Here, since the melting of the raw material powder 41 proceeds until the temperature equilibrium between the melt 52 and the water-cooled crucible 10 is achieved, the raw material powder in contact with the side wall part 11 and the bottom part 12 of the crucible is Sintering by the high temperature of the melt forms a sintered layer 53 of several mm, and a solid-liquid interface 54 is formed between the sintered layer 53 and the liquid melt 52.

Therefore, since the melt 52 always contacts only the sintered layer 53 having the same composition, the penetration of impurities by the contact with the side wall portion 11 and the possibility of contamination by it are certainly excluded. In addition, since the side wall portion 11 does not generate contact with the melt, the possibility of damage is eliminated.

On the other hand, the raw material powder that is initially insufficient in the crucible 10 as the raw material powder 41 is melted is supplemented through the conduit 42 of the supply device 40 as shown in Figure 5e (S25) ). This replenishment may be carried out after the step shown in FIG. 5C.

 Finally, as shown in FIG. 5F, the melt 52 discharged through the sleeve tube 32 is slowly cooled while being pressurized through the roller 33 installed at the lower portion thereof, and then is contained in the lower container 34 (S3). .

In discharging the melt 52, the sleeve tube 32 is formed to protrude a predetermined height from the bottom portion 12 of the crucible 10 into the crucible, so that impurities are not introduced and are melted by a high temperature. The melt can be discharged immediately.

Meanwhile, in FIGS. 5D to 5F, the sintered layer 53 is shown in contact with the side wall portion of the crucible, but this is for convenience of illustration, and in reality, the sintered layer is only a few mm from the solid-liquid boundary 54. Is formed, and the raw material powder exists in the state which does not melt from this sintered layer to a side wall part.

EXAMPLE

 Table 1 below describes the results of experiments using carbon heating materials while modifying the inner diameter of the crucible, the frequency of use of the high frequency generator, and the content of lead glass contained in the raw material powder while the other conditions were the same. On the other hand, a heart-ray oscillation device was used as a high frequency generator.

Table 1

Crucible Bore Use frequency Lead content in glass Heating material input result Experiment 1 500 mm 400 kHz 28 or 60% by weight No input Not melted. Experiment 2 650 400 " " " Experiment 3 800 400 " Input Fully melt after 5 hours Experiment 4 500 600 " No input Not melted. Experiment 5 650 600 " " " Experiment 6 800 600 " Input Fully melt after 5 hours

According to the above Table 1, in Experiments 1, 2, 4 and 5, it was found that the melting of the raw material powder containing lead components did not occur only by heating by a high frequency generator. Therefore, Experiments 1, 2, 4 and In Experiment 5, we concluded that preheating of raw powder should be carried out.

However, according to Experiment 3 and Experiment 6, the raw material powder was completely melted after 5 hours without preheating according to the input of the carbon heating material.

In the following photographs 1 to 4, in the conditions of Experiments 3 and 6, the molten state with the passage of the high frequency heating time is shown.

[Photo 1]

In the photograph 1, after 2 hours, the molten core is formed around the heat generating material positioned adjacent to the cooling pipe layer 14 of the water-cooled side wall portion 11. Around the molten core, a white raw material powder and a cooling pipe layer 14 of the side wall portion 11 are shown.

[Photo 2]

Photograph 2 shows a state in which molten nuclei are formed and expanded around a plurality of heat generating materials after 2 hours and 30 minutes.

[Photo 3]

Photograph 3 shows a further enlargement of the molten core after 3 hours.

[Photo 4]

Photograph 4 shows that the raw material powder is completely melted as the sintered layer is formed inside the crucible after 5 hours.

According to the present invention as described above, the raw material contained in the crucible is quickly melted to form a melt, the sintered layer is easily formed inside the crucible, thereby suppressing the chemical action due to contact between the melt and the inner wall of the crucible, the melt Since it can be easily extracted from the high temperature portion, there is an effect that can produce a product of high purity.

In addition, according to the present invention, there is an effect of providing a method for producing a high-purity melt without preheating by using an improved high frequency induction heating apparatus.

Claims (19)

A crucible consisting of a side wall and a bottom having a cooling device through which cooling water flows, In the high frequency induction heating apparatus comprising a high frequency generator for heating the inside of the crucible while moving along the vertical direction of the crucible at a spaced position outside the side wall portion of the crucible, The coolant flows into the cooler of the side wall via the cooler of the bottom and then flows back to the bottom. The cooler of the side wall is composed of a plurality of individual cooling pipes. Combined, The high frequency induction heating apparatus A roller for pressurizing and cooling the melt discharged to the melt discharge port; A high frequency induction heating apparatus, further comprising: a storage container for storing the slow cooled melt falling from the roller.  According to claim 1, wherein the cooling device provided in the bottom of the crucible has a double structure consisting of an upper layer adjacent to the inside of the crucible and a lower layer of the upper layer, the coolant flowing into the upper layer through the inlet pipe to cool the crucible bottom At the same time, the high frequency induction heating apparatus characterized in that the flow through the lower layer via the cooling device of the side wall portion is discharged through the drain pipe installed in the lower layer. The crucible according to claim 2, wherein the side wall cooling device comprises a plurality of individual cooling pipes along the rim of the crucible, the one pipe communicating with the top layer of the bottom portion and the other pipe communicating with the bottom layer of the bottom portion communicating at the upper end of the crucible. High frequency induction heating apparatus characterized in that the arrangement. According to claim 3, wherein the upper layer is made of a partition plate which is an interface between the upper plate and the lower layer which is the bottom surface of the crucible, the lower layer is made of the partition plate and the lower plate below the partition plate, The upper plate and the partition plate is formed with a plurality of holes along the edge, A water supply nipple is formed in the hole of the upper plate for communicating the upper layer and the one pipe, and a water drain nipple for communicating the lower layer and the other pipe is formed in the other hole of the upper plate and the hole of the partition plate. High frequency induction heating apparatus, characterized in that formed. According to any one of claims 1 to 3, The side wall portion of the crucible further comprises a heat insulating material layer of asbestos, rubber band and gypsum sequentially stacked, And the plurality of cooling pipes are formed adjacent to the insulation layer.  4. The high frequency induction heating apparatus according to any one of claims 1 to 3, wherein a melt outlet is provided at the bottom, and the melt outlet is protruded into the crucible.   The high frequency induction heating apparatus according to any one of claims 1 to 3, wherein a skimmer is further provided inside the crucible to prevent the raw powder from being discharged directly to the outlet. delete The high frequency heating apparatus according to any one of claims 1 to 3, further comprising a raw material supply means for filling a raw material powder in the crucible. The high frequency heating device according to any one of claims 1 to 3, wherein the crucible further comprises a mixing device for mixing the melt. Filling the powder powder in the crucible (S1) and Melting the raw material powder in the crucible with a high frequency generator (S2); In the manufacturing method of the melt using a high frequency induction heating device comprising the step (S3) of discharging the melt in the step, In the melt filling step (S1) there is no reaction with the melt and a high heat generating material is injected per unit time, A method of producing a melt using a high frequency induction heating apparatus, characterized in that the filling step (S1) of the raw material powder is filled with the raw material powder 70% of the inner space of the crucible. 12. The method of claim 11, wherein the heat generating material is carbon (C). 12. The method of claim 11, wherein the heat generating material is silicon carbide (SiC). The method according to any one of claims 11 to 13, wherein the heating material is formed in a polygonal shape, a spherical shape, a cylindrical shape, or a ring shape. The method for producing a melt according to any one of claims 11 to 13, wherein the raw material powder is glass containing lead (Pb). delete The method of claim 11, wherein the filling step (S1) of the raw material powder, Filling the raw powder 50% in the inner space of the crucible (S11) and Injecting the heating material (S12) and, Subsequently, a step (S13) of finishing filling 20% of the inner space of the crucible with the raw material powder (S13). The method of claim 11, wherein the melting step (S2), When the high frequency electromagnetic field is initially applied to the molten core is formed around the heat generating material in the raw material powder 41 (S21), A step (S22) in which the molten core 51 grows while melting the surrounding raw powder by the high temperature heat generation of the molten core 51; Almost all refractory raw material powders are melted except for the inner wall part and the bottom part of the crucible 10 and the unheated upper part (S23), It is made with a step (S24) that all the raw material powder in the crucible is melted, In the step S24, the raw powder in contact with the cooling pipe and the bottom of the crucible is sintered to form a sintered layer 53 of several mm, and the solid-liquid interface between the sintered layer 53 and the melt 52 Method for producing a melt using a high frequency induction heating apparatus characterized in that it is formed. 19. The method according to claim 18, further comprising the step (S25) of replenishing the raw material powder, which is insufficient in the crucible 10 as the initially charged raw material powder is melted through the conduit 42. Method for producing melt using high frequency induction heating apparatus.

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