JP5380671B2 - Glass raw material melting method, melting apparatus, and glass manufacturing apparatus - Google Patents

Description

  The present invention relates to a glass raw material melting method and melting apparatus for industrially producing glass products such as plate glass, bottle glass, fiber glass, and electric glass, and a glass manufacturing apparatus.

  Conventionally, glass melting kilns (hereinafter referred to as “Siemens kilns”) for melting glass raw materials have been manufactured by F.S. Invented by Siemens, the basic design concept is still followed and used (for example, see Non-Patent Document 1). Some current Siemens kilns are provided with a heat exchange device called a heat storage chamber or a heat exchange chamber, and are used for preheating combustion air. As a heating energy source, fossil fuels such as heavy oil or natural gas are mainly used. The fossil fuel is burned in the upper space of the glass melt staying in the Siemens kiln together with the preheated combustion air, and the glass raw material and the glass melt are heated by the radiant heat. This glass melt is heated to a maximum of about 1600 ° C.

  In order to obtain a glass product having a predetermined composition, a mixture of powdered glass raw materials (hereinafter referred to as “batch”) is supplied to a Siemens kiln, and the batch is deposited on the glass melt to form a thick raw material layer, It dissolves little by little over a long time. At this time, since the batch on the melt melts sequentially from the material that is easily reacted or melted, the silica or sand containing a large amount of the melting point or viscosity is left behind, and they are bonded to each other. A hardly fusible substance is easily formed in the raw material layer. Further, for the same reason, in the initial state of the melt formation, a glass melt having a composition different from that of the batch is generated locally, and the melt is likely to be inhomogeneous.

  Such formation of a hardly-fusible substance and heterogeneity of the melt cause defects such as undissolved defects (such as blisters) and inhomogeneous defects (such as unevenness and streaks) in the obtained glass product. Furthermore, in order to reduce such defects, conventionally, for example, in the production of sheet glass or the like, it is necessary to maintain a molten state for an extremely long period of 3 to 5 days, and the large-scale kiln and enormous energy are required. Consumption is inevitable. Conventionally, melting of glass raw material and removal of bubbles (clarification) are designed to be performed in the same kiln, so the melt that has undergone the clarification process and the unclear melt are mixed inside the kiln. There is a risk that efficient clarification may not be performed. Furthermore, the Siemens kiln has a large heat capacity, so it is suitable for large-scale mass production that produces a large amount of glass products of a certain variety, but there is a problem that it cannot cope with the agile production of a small variety of products.

  In addition, as a method for heating a high melting point material, a technique of melting using thermal plasma has been developed. Specifically, quartz glass is to be manufactured by transfer plasma melting. In this method, the raw material is melted by thermal plasma generated between plasma arcs formed by a pair of electrodes (anode and cathode) having opposite polarities (see, for example, Patent Document 1). However, there is no example used for melting glass composed of a plurality of components.

  Therefore, the batch is processed into pellets having a diameter of about 3 to 8 mm so that the batch does not accumulate on the glass melt, and the glass melt is heated to a high temperature by continuously injecting it from the combustion burner. A technique for supplying the above has been developed (see, for example, Patent Document 2). Also, a technology has been developed in which a fine powder batch is continuously supplied from the upper part of the combustion chamber provided in the upper part of the glass melt chamber, heated by the combustion flame and strongly driven into the melt surface by the flow of the combustion flame ( For example, see Patent Document 3). However, in any of these methods, formation of the raw material layer on the glass melt is unavoidable and it is difficult to obtain a remarkable effect.

JP 2002-356337 A (Claim 1, FIG. 1 and FIG. 5) US Pat. No. 4,183,725 (Claim 1, FIG. 1, text) US Pat. No. 5,672,190 (Claim 1, FIG. 1) Masayuki Yamane et al. “Glass Engineering Handbook”, Asakura Shoten (1999), pages 303-308

  An object of the present invention is to eliminate the problems in the conventional glass raw material melting method and melting apparatus that cause defects such as undissolved defects and inhomogeneous defects in the glass product.

  In addition, the object of the present invention is to greatly suppress the enlarging and enormous energy consumption of the kiln, and to dissolve the glass raw material efficiently and with a small amount of small energy consumption, and to dissolve the glass raw material To provide an apparatus.

  Moreover, the objective of this invention is providing the glass manufacturing apparatus which can clarify a glass melt efficiently.

  Moreover, the objective of this invention is providing the glass manufacturing apparatus which can respond to the flexible production of a small amount multi-product type.

In order to solve the above problems, the present invention provides the following inventions.
(1) When a glass raw material for producing a glass composed of a plurality of components is melted in the glass melt part, individual fine mixed particles made of the glass raw material are components corresponding to the composition of the glass as the final product. a step of preparing a structure ratio close to the ratio; step to form a heated liquid body a finely mixed particles made of the glass raw material in a gas phase atmosphere; form made liquid phase body to stay in the glass melt portion A method of melting a glass raw material, comprising : a step of lowering and supplying a glass melt ; and a step of discharging the glass melt from the glass melt portion in a melt state ;
(2) The glass raw material melting method according to (1), wherein the heated gas phase atmosphere is formed by a thermal plasma arc and / or an oxyfuel flame;
(3) The glass melt according to (1) or (2), wherein the glass melt is heated by a thermal plasma arc and / or an oxycombustion flame at a position where the liquid phase formed from fine mixed particles descends and in the vicinity thereof. Melting method of raw materials;
(4) The method for melting glass raw material according to (2) or (3), wherein fine mixed particles are supplied from the periphery of the plasma formed by thermal plasma toward the center;
(5) The method for melting a glass raw material according to (2), wherein fine mixed particles are supplied to a central portion of a combustion flame nozzle that forms an oxyfuel combustion flame;
(6) The melting method of the glass raw material according to any one of (1) to (5), wherein the temperature of the heated gas phase atmosphere is 1600 ° C. or higher;
(7) Any of (1) to (6), wherein a part or all of the glass cullet constituting a part of the glass raw material is directly supplied onto the glass melt without passing through the heated gas phase atmosphere. A method for melting a glass raw material according to claim 1,
(8) A glass raw material melting apparatus for producing glass composed of a plurality of components, comprising the glass raw material, and prepared at a composition ratio close to the component ratio corresponding to the composition of the glass as the final product, glass melt to dwell the glass melt form made liquid phase body is supplied to the upper; material heating portion to form the heating vapor atmosphere to form a liquid phase body by heating the individual fine mixed particles And a glass melt discharge port for discharging the glass melt from the glass melt part in a melt state ;
(9) The glass raw material melting apparatus according to (8), wherein the raw material heating unit for forming the heated gas phase atmosphere is formed of a thermal plasma generator and / or an oxyfuel flame nozzle;
(10) The glass raw material melting apparatus according to (8) or (9), wherein the glass melt part has auxiliary heating means for the glass melt;
(11) The glass raw material melting apparatus according to any one of (8) to (10), and a bubble removing tank connected to a glass melt outlet of the glass raw material melting apparatus. Glass manufacturing equipment;
(12) The glass melt is discharged from the glass melt outlet of the glass raw material melting apparatus in an incomplete bubble removal state, and the discharged glass melt is introduced into the bubble removal tank (11). A glass manufacturing apparatus according to claim 1;
(13) The glass raw material melting device according to (8) or (9), wherein the glass melt part has a means for stirring the glass melt; and (14) The glass according to any one of (8) to (13) A glass production apparatus comprising: a raw material melting apparatus; and a glass raw material spray drying apparatus connected to a gas discharge path of the glass raw material melting apparatus;
It is.

  In the glass raw material melting method and glass manufacturing apparatus of the present invention, for example, glass raw materials mixed in small units of fine particles having a particle size of 0.001 to 0.5 mm are melted, so that undissolved defects are generated. And glass melt inhomogeneity are suppressed, and it is possible to drastically shorten the melting time of glass raw materials. The glass is equivalent to a conventional large-scale glass melting furnace with a relatively small scale and low energy consumption. Dissolving ability can be demonstrated.

  Further, in the present invention, it is possible to dramatically reduce the melting time of the glass raw material and to greatly reduce the size of the glass manufacturing apparatus, thereby reducing construction costs and waste when the glass manufacturing apparatus reaches the end of its life. Can be reduced.

  Furthermore, in the present invention, since the occurrence of undissolved defects and the inhomogeneity of the melt are suppressed, the glass production yield can be improved, the glass product quality can be improved, and the glass production cost can be reduced.

  Further, in the present invention, since the glass manufacturing apparatus can be greatly reduced in size, waste of raw materials and consumed energy accompanying the composition change can be greatly reduced in the case of a small variety of glass products.

  The glass raw material melting method and melting apparatus and glass manufacturing apparatus of the present invention will be described in detail below.

  The glass raw material melting method of the present invention is a method for producing a glass melt by melting a glass raw material for producing a glass composed of a plurality of (usually three or more components) components. Glass raw materials used include silica sand, anhydrous boric acid, calcium metaphosphate, calcium nitrate, barium nitrate, aluminum oxide, neodymium oxide, feldspar and other fine powder raw materials, and water-soluble sodium nitrate, potassium nitrate, sodium sulfate, etc. Fine mixed particles are used. Fine glass cullet can also be mixed into the finely mixed particles. The component composition of the fine mixed particles can be appropriately determined according to characteristics such as a thermal expansion coefficient, a molding temperature, and chemical durability required for the glass product. In this invention, it can apply suitably also to the glass raw material which does not mainly have a silica component, and the content of a silica may be less than 50 mol%, for example, 0-20 mol%. Finely mixed particles can be heated in a short time and the emission of the generated gas is easy. Therefore, the particle size is 0.5 mm (weight average) or less. From this point, it is preferable that the particle diameter is 0.01 mm (weight average) or more.

  The particle size of the fine powder material constituting the fine mixed particles is usually 0.001 to 0.05 mm (1 to 50 μm) (weight average), and there is little variation in the composition of each mixed particle to be formed, and the uniform composition From the viewpoint of obtaining particles, the component that is not water-soluble is preferably 0.05 mm or less. In particular, the smaller the particle size of the fine mixed particles, the shorter the heating time and the easier it is to dissipate the generated gas, which is preferably in the range of 0.001 to 0.03 mm. From the viewpoint of reducing composition variation between particles, particles having a particle size of 0.005 mm or more are preferable.

  Moreover, these glass raw material mixtures can contain a clarifying agent, a coloring agent, a melting aid, an opacifier, etc. as an auxiliary material as needed. Further, since boric anhydride and the like in these glass raw materials have a relatively high vapor pressure at a high temperature and are likely to evaporate by heating, it is preferable to mix them in excess of the composition of the glass as the final product.

  As a method of forming the glass raw material into particles and preparing fine mixed particles, a spray drying method or the like can be used, and an aqueous solution in which the glass raw material is dispersed and dissolved is sprayed in a high-temperature atmosphere and dried instantaneously. A solidification method is preferred. In addition, this molded body may be composed only of raw materials having a mixing ratio corresponding to the component composition of the final glass product, but the mixture is further mixed with glass cullet powder having the same composition and used as a glass raw material. You can also.

  In the present invention, the fine mixed particles are heated in a heated gas phase atmosphere. The heating gas phase atmosphere for heating the mixed particles is not particularly limited as long as it can be heated in the gas phase atmosphere, and various heating furnaces can be used. Thermal plasma arcs such as direct current plasma, multiphase plasma, and high frequency induction plasma, oxyhydrogen flames, and oxygen combustion flames such as natural gas-oxygen combustion flames can be used. Among these, high efficiency, easy to obtain a large output, relatively low equipment cost, heating under atmospheric pressure, technically established, can be used stably for a long time For this reason, it is particularly preferable to use a multiphase plasma, an oxyhydrogen flame or a natural gas-oxygen combustion flame.

  As the working gas of the thermal plasma used in the present invention, it is preferable to use argon, oxygen, air, water vapor or the like alone or in combination.

  The method of supplying fine mixed particles to the heated gas phase atmosphere used in the present invention is preferably a method of supplying mixed particles from the periphery of the thermal plasma nozzle toward the center. Further, when an oxyfuel flame is used as the heated gas phase atmosphere, the temperature of the central portion is highest, so the mixed glass raw material is supplied to the central portion of the combustion flame nozzle that forms the oxyfuel flame. In addition, the supply speed of the mixed particles in the heated gas phase atmosphere is usually about 1 to 200 kg / min, and in the case of a small-scale dissolution apparatus for high-mix low-volume production, 0.1 to 5 kg / min. Is preferred.

  In addition, the temperature of the heated gas phase atmosphere rapidly dissipates gas components contained in the mixed particles in the form of moisture, crystal water, nitrates (sodium nitrate, calcium nitrate, etc.), and the vitrification reaction proceeds considerably. Therefore, the temperature is preferably set to be equal to or higher than the melting temperature of silica sand, and is usually set to 1600 ° C. or higher.

  In the present invention, the fine mixed particles heated in a heated gas phase atmosphere, for example, passing through the heated gas phase atmosphere, form a liquid phase. The formed liquid phase body is lowered and supplied onto the glass melt staying in the glass melt portion, and subsequently heated. The arrival position of the liquid phase formed from the finely mixed particles on the glass melt may be a fixed position in the glass melt part, and the raw material supply nozzle for supplying the finely mixed particles to the heated gas phase atmosphere It may be dispersed so as not to be fixed in one place by swinging. Further, in order to diffuse the fine mixed particles that have reached a certain position, the surface of the glass melt may be periodically stirred. Further, a stirrer such as a stirrer or bubbler for stirring the entire glass melt may be provided in the melting device to promote homogenization of the vitrified glass melt. A small liquid combustion burner may be provided in the melting apparatus to stir the glass melt.

  Moreover, you may supply the glass cullet which comprises a part of glass raw material directly on a glass melt, without letting the one part or all part pass in the said heating gaseous-phase atmosphere. In this case, the glass cullet is formed into particles together with other raw materials and heated by passing it through a high-temperature heated gas phase atmosphere. There is a method of heating by directly putting it into the melt, but it is preferable to heat the fine cullet by the former method and the coarse cullet by the latter method. In the latter case, it is preferable to install a stirrer in the melting apparatus in order to avoid a decrease in homogeneity due to a difference in composition between the cullet and the glass that has passed through the heated gas phase atmosphere.

  Next, the glass raw material melting apparatus of the present invention will be described with reference to FIG. FIG. 1 is a schematic cross-sectional view showing a basic configuration example of a glass raw material melting apparatus according to the present invention. A glass raw material melting apparatus 1 having a configuration shown in FIG. 1 has a rectangular furnace body 1a, and a raw material supply port 2 for supplying fine mixed particles in which the glass raw material is formed into particles into the furnace body, A raw material heating part for heating mixed particles descending in the furnace, a glass melt part in which the glass melt 4 stays, and a glass melt outlet 5 for discharging the glass melt 4 from the glass melt part Prepare.

  The raw material heating unit can include one oxyfuel flame nozzle 6 that projects through the ceiling of the furnace body 1a and protrudes into the furnace body 1a. Due to the combustion flame formed by this nozzle, a heated gas phase atmosphere 3 is formed at the center of the furnace body 1a.

  The raw material heating unit can include a plurality of arc electrodes 7 that project through the side wall of the furnace body 1a and project into the furnace body 1a. A heated gas phase atmosphere 3 is formed in the center of the furnace body 1a by the thermal plasma formed by the electrodes.

  The temperature at the center of the heated gas phase atmosphere 3 is about 2,800 ° C. in the case of a hydrogen-oxygen combustion flame, and 5,000-20,000 ° C. in the case of thermal plasma.

  The raw material supply port 2 is disposed at the upper part of the furnace body 1a, and has a role of introducing fine mixed particles formed of glass raw material into particles from the outside of the furnace and supplying them into the furnace body at a predetermined supply rate. The raw material supply port 2 can be constituted by, for example, a nozzle capable of adjusting the supply position of the fine mixed particles according to the heated gas phase atmosphere 3 formed in the raw material heating unit. For example, when the raw material supply port 2 that supplies fine mixed particles from the periphery to the center of the heated gas phase atmosphere 3 formed by the thermal plasma, or when the oxyfuel flame forms the heated gas phase atmosphere 3, Therefore, it is preferable to dispose the raw material supply port 2 for supplying the mixed particles to the central portion of the combustion flame nozzle 6 that forms the oxyfuel flame. Further, by swinging the raw material supply port 2, the mixed glass raw material liquid phase descending on the glass melt 4 may be distributed and supplied without being concentrated in one place.

  The glass melt part is located in the lower part of the furnace body 1a, and a liquid phase formed from fine mixed particles heated through the heated gas-phase atmosphere 3 is deposited and the glass melt 4 is formed in the glass melt part. It is formed. The glass melt part may be provided with auxiliary heating means for heating the glass melt 4 staying in the glass melt part. The glass melt 4 can be kept warm by this auxiliary heating means. As the auxiliary heating means, the glass melt 4 is heated by passing an electric current directly through the glass melt 4 or an electric resistor inserted in the glass melt 4 to heat the glass melt by energization heating. A pair of electrodes is preferably used.

  In this glass raw material melting apparatus 1, the fine mixed particles supplied from the raw material supply port 2 are heated and passed through a heated gas phase atmosphere 3 formed by the raw material heating unit as shown in FIG. Is lowered onto the glass melt 4 staying in the glass melt portion. At the start of the melting of the glass raw material, the glass melt 4 does not stay in the glass melt part, but the glass melt part is heated to a predetermined temperature by the heated gas phase atmosphere 3 in advance. The liquid phase body that passes and descends is heated by the radiant heat from the heating gas phase atmosphere 3 and the furnace body 1a even after being deposited on the glass melt portion, and further, an auxiliary provided in the glass melt portion as necessary. The glass melt 4 is formed by being heated and melted by the heating means. Thereafter, the heated liquid phase descending onto the glass melt 4 is melted to form the glass melt 4. And it discharges | emits from the glass melt discharge port 5 at a predetermined | prescribed speed | rate, is introduce | transduced into a bubble removal tank etc. as needed, and a glass product is manufactured through a required formation process.

  The glass raw material melting apparatus of the present invention is not limited to the embodiment shown in FIG. 1, and various modifications are possible. For example, in the glass raw material melting apparatus shown in FIG. 1, an example in which the arc electrode 7 that generates thermal plasma and the combustion flame nozzle 6 are provided as the raw material heating unit is illustrated. A phase atmosphere may be formed.

  Furthermore, the glass manufacturing apparatus of this invention can be equipped with the bubble removal tank (clarification tank) connected with the glass melt discharge port 5 of the melting | dissolving apparatus 1 of the glass raw material 1 shown in FIG. After the glass melt from which bubbles have been removed in the bubble removing tank is supplied to various molding apparatuses such as a float bath, a fusion molding machine, a glass bottle molding machine, a roll molding machine, and a press molding machine, The glass product is manufactured by gradually cooling to a predetermined temperature in a slow cooling furnace.

  At this time, in the glass manufacturing apparatus of the present invention, the glass melt discharged from the glass melt discharge port 5 of the glass raw material melting apparatus 1 is in a state in which bubbles are almost removed, but further complete bubble removal is performed. In order to carry out the process, by introducing the discharged glass melt into the bubble removal tank and removing the bubbles, the two functions of initial dissolution and bubble removal are separated, and the overall size of the apparatus can be reduced. There is.

  As the bubble removal tank used in the present invention, it is possible to use a shallow unidirectional flow tank, a vacuum clarification tank, etc., which is less than half the depth of a conventional melting tank and is less likely to cause convection and bubbles are likely to rise. preferable. For example, a substantially rectangular parallelepiped tank formed of a zirconia or platinum alloy corrosion-resistant heat resistant material and having a longitudinal direction in the flow direction of the glass melt, the glass melt inlet connected to the glass melt outlet 5; The glass melt lead-out port is provided on the side wall facing the glass melt inlet, and the glass melt does not form a short path. For example, the glass melt is maintained at a temperature of about 1400 ° C. for a predetermined time in the tank. It is configured to stay and discharge large and small bubbles in the glass melt. And the bubble discharge | released from the inside of glass melt is discharge | released outside from the vent hole provided in the ceiling part etc. of the bubble removal tank.

  The bubble removal tank is provided with a baffle plate or the like in the tank so that the glass melt flowing in the tank does not form a short path, and has a predetermined time from the glass melt inlet to the glass melt outlet. You may be comprised so that it may distribute over. The glass melt from which bubbles have been removed in the bubble removal tank is used for various molding apparatuses (not shown) such as a float bath, a fusion molding machine, a glass bottle molding machine, a roll molding machine, a press molding machine, and a short fiber / long fiber spinning machine. The required glass products are manufactured.

  Furthermore, a stirring tank can be provided between the glass melt part used in the present invention and the bubble removal tank for the purpose of improving homogenization of the glass melt, and the cullet is the glass melt of the glass melt part. In the case where it is directly charged, it is particularly preferable to provide a stirring tank because the homogeneity often decreases due to the difference in composition between the cullet pieces or between the cullet and the glass raw material particles. Moreover, you may install stirring means, such as a stirrer or a small submerged combustion burner, in a glass melt part.

  EXAMPLES Hereinafter, although the Example of this invention is given and this invention is demonstrated further more concretely, this invention is not limited to these Examples.

Example 1
A total of 800 kg was weighed at a ratio of 53 mol% of silica sand (SiO ₂ ) within a particle size of 5 μm, 30.5 mol% of boric anhydride, 5.9 mol% of alumina, 10.2 mol% of barium nitrate, and 0.4 mol% of antimony oxide, 200 kg of cullet pulverized within a diameter of 5 μm was added and mixed by stirring, and water was supplied in a volume ratio of 3 times to obtain a slurry liquid in which fine particles were dispersed. By spraying the obtained liquid mixture into a spray drying apparatus heated to 200 to 300 ° C., fine mixed particles made of granular raw material particles having a diameter of about 0.05 mm were obtained.

Next, it is attached to the upper part of the glass melt portion of the glass raw material melting apparatus 1 made of refractory brick having the structure shown in FIG. 1 and having a bottom surface of 80 × 80 cm and a height of 2 m. The fine mixed particles were supplied from the vicinity of the center of the oxyhydrogen combustion flame nozzle 6 at a supply rate of 3 kg / min. The fine mixed particles are heated to 1200 ° C. or higher to reach the bottom (or glass melt surface) of the glass melt part to form a liquid phase, and the moisture, NO ₃ , organic matter, etc. in the raw material are almost completely Was released. Since the glass melt was previously heated to about 1400 ° C. by the oxyhydrogen combustion flame, the heated liquid phase landed on the bottom of the glass melt, and then the oxyhydrogen combustion flame, the glass melt, and the furnace wall The glass melt 4 was formed by being further heated by the radiation heat from and melted together and integrated in the melt state to form the glass melt 4, and provided on the side surface near the bottom of the glass melt portion 2 hours after the start of the raw material supply. The glass melt was discharged from the melt outlet 5 at an average speed of about 2.7 kg / min. The amount of gas supplied to the oxyhydrogen combustion flame at this time was 600 L / min for hydrogen and 300 L / min for oxygen. The glass melt 4 was introduced into a bowl-like bubble removing tank having a width of 50 cm, a length of 2 m, and a height of 30 cm, which was electrically heated to about 1400 ° C., and was retained. After about 3 hours, the glass melt 4 is continuously discharged from the other end at an average speed of about 3.1 kg / min, led to a block-shaped mold (10 cm × 20 cm × 5 cm), and once released to 200 to 300 ° C. After cooling, the solidified glass molded body was taken out from the mold and subjected to a heat annealing treatment. When the surface of this glass molded body was polished and inspected for defects and the like, undissolved silica sand and bubbles having a diameter of 0.1 mm or more were not observed, and local unevenness in refractive index was also observed for all glasses. There wasn't.

Example 2
In the same glass melting apparatus as in Example 1, a heated gas-phase atmosphere is formed by a six-phase plasma arc electrode, and the raw material supply provided on the ceiling of the furnace body 1a using the same fine mixed particles as in Example 1 The raw material particles are supplied from the mouth 2 at a supply rate of 1.5 kg / min, two pairs of heating electrodes are inserted at the bottom of the glass melt part, and the stirring tank equipped with a platinum stirrer is connected to the bubble removal tank. Using an apparatus provided between them, cullet grains preheated to about 700 ° C. are supplied at a rate of 2 kg / min through an opening provided on the side 40 cm above the lower part of the glass melt, and about 1400 ° C. Heating to near. The cullet grains used here were preliminarily pulverized to an outer diameter of about 5 mm, mixed well and then subjected to composition analysis to confirm that they had almost the same composition as the raw material particles. As a result, the same results as in Example 1 could be obtained.

  The present invention significantly suppresses the occurrence of defects such as undissolved defects and inhomogeneous defects in the prior art, enables efficient bubble removal, and avoids the large-scale melting furnace and enormous energy consumption. It can also be used for the flexible production of a small variety of products, so it is useful for industrial production of all glass products such as flat glass, bottle glass, fiber glass, and electric glass.

The schematic longitudinal cross-sectional view of the melting | dissolving apparatus of the glass raw material which concerns on embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Melting apparatus 1a Furnace body 2 Raw material supply port 3 Heating gas-phase atmosphere 4 Glass melt 5 Glass melt discharge port 6 Combustion flame nozzle 7 Arc electrode

Claims (14)

When melting a glass raw material for producing glass composed of a plurality of components in the glass melt part, individual fine mixed particles made of the glass raw material are close to the component ratio corresponding to the composition of the glass as the final product. glass melt staying shape made liquid phase body glass melt unit; step of preparing a structure ratio; step of finely mixed particles made of the glass material is heated in the vapor phase atmosphere to form a liquid phase body A glass raw material melting method comprising : a step of lowering and supplying; and a step of discharging the glass melt from the glass melt portion in a melt state .   The method for melting a glass raw material according to claim 1, wherein the heated gas phase atmosphere is formed by a thermal plasma arc and / or an oxyfuel flame.   The method for melting a glass raw material according to claim 1 or 2, wherein the glass melt is heated by a thermal plasma arc and / or an oxyfuel flame at a position where the liquid phase formed from fine mixed particles descends and in the vicinity thereof.   The glass raw material melting method according to claim 2 or 3, wherein fine mixed particles are supplied from the periphery of the plasma formed by thermal plasma toward the center.   The method for melting a glass raw material according to claim 2, wherein fine mixed particles are supplied to a central portion of a combustion flame nozzle that forms an oxyfuel flame.   The method for melting a glass raw material according to any one of claims 1 to 5, wherein the temperature of the heated gas phase atmosphere is 1600 ° C or higher.   A part or all of the glass cullet constituting a part of the glass raw material is supplied directly onto the glass melt without passing through the heated gas phase atmosphere. Method for melting glass raw materials. An apparatus for melting glass raw material for producing glass composed of a plurality of components, each of which is made of the glass raw material and is prepared with a component ratio close to the component ratio corresponding to the composition of the glass as the final product. material heating unit to form a heated vapor atmosphere to form a liquid phase body mixed particles by heating; glass melt unit form made liquid phase body thereby staying molten glass to be supplied to the upper; and A glass raw material melting apparatus comprising a glass melt outlet for discharging a glass melt from a glass melt part in a melt state .   The glass raw material melting apparatus according to claim 8, wherein the raw material heating unit for forming the heated gas phase atmosphere is formed by a thermal plasma generator and / or an oxyfuel flame nozzle.   The glass raw material melting apparatus according to claim 8 or 9, wherein the glass melt part has auxiliary heating means for the glass melt.   A glass production comprising: the glass raw material melting apparatus according to any one of claims 8 to 10; and a bubble removal tank connected to a glass melt outlet of the glass raw material melting apparatus. apparatus.   12. The glass melt discharge port according to claim 11, wherein the glass melt is discharged from the glass melt discharge port of the glass raw material melting apparatus in an incomplete bubble removal state, and the discharged glass melt is introduced into the bubble removal tank. Glass manufacturing equipment.   The glass raw material melting apparatus according to claim 8 or 9, wherein the glass melt part has a glass melt stirring means. A glass production comprising: the glass raw material melting apparatus according to any one of claims 8 to 13; and a glass raw material spray drying apparatus connected to a gas discharge path of the glass raw material melting apparatus. apparatus.

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