CN107298521B - Glass manufacturing apparatus and method for manufacturing high-transmittance optical glass - Google Patents
Glass manufacturing apparatus and method for manufacturing high-transmittance optical glass Download PDFInfo
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- CN107298521B CN107298521B CN201710481258.1A CN201710481258A CN107298521B CN 107298521 B CN107298521 B CN 107298521B CN 201710481258 A CN201710481258 A CN 201710481258A CN 107298521 B CN107298521 B CN 107298521B
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B5/00—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture
- C03B5/02—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture in electric furnaces, e.g. by dielectric heating
- C03B5/027—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture in electric furnaces, e.g. by dielectric heating by passing an electric current between electrodes immersed in the glass bath, i.e. by direct resistance heating
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B3/00—Charging the melting furnaces
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B5/00—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture
- C03B5/16—Special features of the melting process; Auxiliary means specially adapted for glass-melting furnaces
- C03B5/18—Stirring devices; Homogenisation
- C03B5/193—Stirring devices; Homogenisation using gas, e.g. bubblers
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C3/00—Glass compositions
- C03C3/04—Glass compositions containing silica
- C03C3/062—Glass compositions containing silica with less than 40% silica by weight
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C4/00—Compositions for glass with special properties
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/50—Glass production, e.g. reusing waste heat during processing or shaping
- Y02P40/57—Improving the yield, e-g- reduction of reject rates
Abstract
The invention belongs to the technical field of glass manufacturing, and particularly discloses a glass manufacturing device and a manufacturing method of high-transmittance optical glass, aiming at solving the problem that electrodes are easy to corrode in the using process of the existing glass manufacturing device to influence the quality of produced glass. The glass manufacturing device comprises a melting tank and an electrode, wherein a melting cavity is arranged in the melting tank; the electrode is arranged on the side wall of the melting cavity, and the upper edge of the electrode is positioned below the upper limit of the liquid level of the molten glass. The method for manufacturing the high-transmittance glass adopts the glass manufacturing device to manufacture the high-transmittance glass. In the production process, the electrode is below the liquid level of the glass liquid, and only the glass liquid is contacted with the electrode, so that the electrode has stable chemical properties, is not easy to oxidize and corrode, and has prolonged service life; and when the glass raw material is continuously or intermittently supplied to the melting tank, since the electrode is not exposed above the molten glass, the electrode is prevented from being subjected to strong thermal shock, and fatigue or damage of the electrode due to the thermal shock is prevented.
Description
Technical Field
The invention belongs to the technical field of glass manufacturing, and particularly relates to a glass manufacturing device and a manufacturing method of high-transmittance optical glass.
Background
Glass is mainly produced by melting a powder glass component oxide as a raw material at a high temperature. In particular, in order to obtain the necessary homogeneous optical characteristics, the optical glass is produced by not only strictly mixing the raw materials but also charging the raw materials into a melting vessel in proper amounts one by one.
At present, a glass manufacturing apparatus for melting glass in a melting vessel by applying electric current to electrodes is widely used. However, such glass manufacturing apparatus are often electrically heated by inserting electrodes at the top of the melting vessel, such as: the invention patent No. ZL200310103685.4 discloses a glass manufacturing apparatus provided with a melting tank for melting glass raw materials and an electrode immersed from above the molten glass in the melting tank for electrically heating the molten glass, the immersion depth of the electrode being variable with respect to the molten glass, a gap ensuring the circulation of the molten glass being provided between the lower end of the electrode and the bottom of the melting tank, and the distance of the gap being set to be less than 1/4 of the depth of the molten glass; a glass raw material supply unit that continuously or intermittently supplies the glass raw material to the melting tank, a clearing tank that performs defoaming treatment on the molten glass supplied from the melting tank, and a working tank that performs viscosity adjustment on the molten glass supplied from the clearing tank, the molten glass being continuously transferred among the melting tank, the clearing tank, and the working tank; the bottom of the melting tank is provided with a gas spraying part for spraying gas.
The above patent is to insert an electrode at the top of the melting tank for conducting electric heating, so as to ensure that the lower end of the electrode keeps a certain gap with the bottom of the melting tank, inhibit corrosion of the melting tank caused by local heating, prevent relative foreign matters and coloring from being mixed in the molten glass, and prolong the service life of the melting tank.
However, in the above patent, the electrode is inserted into the top of the melting tank, the inserted electrode is in contact with the glass liquid, the liquid level of the glass liquid changes along with the continuous production, and the contact point between the liquid level of the molten glass and the electrode becomes a coexistence point of gas phase, liquid phase and solid phase, so that the electrode is easy to corrode, the liquid level continuously changes in a fluctuation manner, and the electrode corroded by oxidation enters the glass liquid, so that the transmittance of the optical glass is affected; on the other hand, the patent adopts the way that an electrode is inserted into the top of a melting tank, and when glass raw materials are continuously or intermittently supplied to the melting tank, the temperature fluctuation of a space where the glass raw materials are added is unavoidable, and the electrode which is exposed in the upper space of the melting tank is often subjected to strong thermal shock, so that the electrode on the upper part of glass liquid of the melting tank is easy to fatigue or damage; on the other hand, once the electrode is oxidized and corroded seriously, the electrode needs to be replaced, and the operation difficulty is high.
Disclosure of Invention
The invention provides a glass manufacturing device, which aims to solve the problem that electrodes are easy to corrode in the using process of the existing glass manufacturing device to influence the quality of glass.
The technical scheme adopted for solving the technical problems is as follows: the glass manufacturing device comprises a melting tank and electrodes, wherein a melting cavity for melting glass raw materials into glass liquid is arranged in the melting tank; the electrode is arranged on the side wall of the melting cavity, the upper edge of the electrode is positioned below the upper limit of the liquid level of the molten glass, and the lower edge of the electrode is positioned above the bottom surface of the melting cavity.
Further, a charging part communicated with the melting cavity is arranged on the melting tank.
Further, a melting tank cover is arranged at the top of the melting tank, and an air jet pipe is arranged at the bottom of the melting tank; the melting tank cover is provided with a burner, and the burner tip of the burner corresponds to the discharging part of the charging part.
Further, the distance between the electrode and the bottom of the melting cavity is 1/6-1/4 of the height of the side wall of the melting cavity.
Further, the electrode is made of noble metal or noble metal alloy, the electrode is in a cylindrical structure or a columnar structure, and the shape of the cross section of the electrode is polygonal or circular.
Further, the electrode comprises an anode and a cathode which are correspondingly arranged on the side wall of the melting cavity; the number of the anodes is 1-6, and the anodes are arranged at intervals along the height direction of the side wall of the melting tank; the number of the cathodes is 1-6, and the cathodes are arranged at intervals along the height direction of the side wall of the melting tank.
Further, the lengths of the anode and the cathode are adjustable, and the distance between the ends of the anode and the cathode is 100-800 mm.
Further, the device also comprises a clarifying tank and a discharging tank, wherein the clarifying tank is connected with the melting tank through a first connecting pipe, and the discharging tank is connected with the clarifying tank through a second connecting pipe.
The invention also provides a manufacturing method of the high-transmittance optical glass, which adopts any one of the glass manufacturing devices to manufacture the high-transmittance optical glass.
Further, the above manufacturing method includes the steps of:
a. preparing glass raw materials, and controlling the distance between the ends of the anode and the cathode to be 100-800 mm;
b. continuously or intermittently feeding a glass raw material from a feeding portion into a melting chamber, and melting the glass raw material by heating by a burner provided on a melting tank cover; when the liquid level of the glass liquid is higher than the upper edge of the electrode, the electrode is electrified to heat the glass liquid, and the temperature of the glass liquid in the melting cavity is controlled to be 1180-1300 ℃; introducing oxidizing gas through a gas nozzle to homogenize the glass liquid;
c. continuously conveying the glass liquid flowing out of the melting tank to a clarifying tank through a first connecting pipe, and eliminating bubbles when the temperature of the glass liquid in the clarifying tank is 1450+/-50 ℃;
d. and continuously conveying the glass liquid flowing out of the clarifying tank to a discharging tank by a second connecting pipe, eliminating stripes when the temperature of the glass liquid in the discharging tank is 1300+/-50 ℃, and continuously flowing out to form glass strips.
The beneficial effects of the invention are as follows:
(1) The electrode is arranged on the side wall of the melting cavity, the upper edge of the electrode is positioned below the upper limit of the liquid level of the molten glass, and the lower edge of the electrode is positioned above the bottom surface of the melting cavity; on the one hand, in the working process, the electrode is below the liquid level of the glass liquid, only the glass liquid contacting with the electrode, namely the solid phase and the liquid phase, is contacted, and the electrode is not positioned at the place where the solid phase, the gas phase and the liquid phase are contacted, so that the oxidation speed and the oxidation degree of the electrode are greatly reduced, the electrode has stable chemical property, is not easy to oxidize and corrode, and has prolonged service life; on the other hand, the electrode and the bottom surface of the melting cavity are ensured to keep a certain interval, the corrosion of the melting pool caused by local heating is avoided, the mixing of relative foreign matters and coloring in the molten glass can be prevented, and the service life of the melting pool can be prolonged.
(2) The electrode is arranged on the side wall of the melting cavity and is not vertically inserted from the upper part of the melting tank, and the electrode is below the liquid level of the glass liquid in the working process.
(3) The length of the electrode comprising the anode and the cathode is adjustable, the distance between the ends of the anode and the cathode is controlled to be 100-800 mm, the electrode is electrified to heat glass liquid between the electrodes, the heat is concentrated, the corrosion of a melting tank can be further reduced, and the transmittance of the optical glass is improved.
Drawings
FIG. 1 is a schematic view of an embodiment of a glass manufacturing apparatus of the present invention;
FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1;
marked in the figure as: the melting tank 100, the melting chamber 101, the charging section 102, the melting tank cover 110, the gas lance 120, the electrode 200, the anode 210, the cathode 220, the burner 300, the clarifier 400, the first connection pipe 410, the discharge tank 500, and the second connection pipe 510.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
Referring to fig. 1 and 2, a glass manufacturing apparatus includes a melting tank 100 and an electrode 200, wherein a melting chamber 101 for melting glass raw materials into molten glass is provided in the melting tank 100; the electrode 200 is disposed on the side wall of the melting chamber 101, and the upper edge of the electrode 200 is located below the upper limit of the liquid level of the molten glass, and the lower edge of the electrode 200 is located above the bottom surface of the melting chamber 101. Wherein, the upper edge and the lower edge of the electrode 200 refer to the electrode 200 part at the uppermost position and the electrode 200 part at the lowermost position after the electrode 200 is mounted; let the minimum rated volume of molten glass heated by the melting chamber 101 be x liters and the maximum rated volume be y liters, the upper limit of the liquid surface of the molten glass means the height position of the liquid surface of the molten glass when the melting chamber 101 accommodates y liters of molten glass, and the lower limit of the liquid surface of the molten glass means the height position of the liquid surface of the molten glass when the melting chamber 101 accommodates x liters of molten glass.
In the working process of the glass manufacturing device, the electrode 200 is below the liquid level of the glass liquid, and only the glass liquid contacting with the electrode 200, namely the solid phase and the liquid phase, is contacted, and the electrode 200 is not positioned at the place where the solid phase, the gas phase and the liquid phase are contacted, so that the oxidation speed and the oxidation degree of the electrode 200 are greatly reduced, the chemical property of the electrode 200 is stable, the electrode is not easy to oxidize and corrode, and the service life is prolonged; meanwhile, the oxidation corrosion of the electrode 200 is weakened, and the influence on the glass transmittance caused by the fact that redundant oxidation corrosion parts of the electrode 200 enter glass liquid is prevented, so that the transmittance of the produced optical glass is improved; in addition, the electrode 200 is not vertically inserted from above the melting tank 100, and since there is no exposed electrode above the molten glass when the glass raw material is continuously or intermittently supplied to the melting tank 100, the electrode 200 is prevented from being subjected to strong thermal shock, and fatigue or breakage of the electrode 200 due to the thermal shock is prevented.
Specifically, as further shown in fig. 1 and 2, the glass manufacturing apparatus further includes a fining bath 400 for heating or cooling to remove bubbles in the molten glass and a discharge bath 500 for treating glass streaks, the fining bath 400 being connected to the melting bath 100 through a first connecting pipe 410, and the discharge bath 500 being connected to the fining bath 400 through a second connecting pipe 510. The clarifier 400, the first connecting pipe 410, the discharge tank 500, and the second connecting pipe 510 are preferably made of platinum or platinum alloy.
The volume of the melting chamber 101 in the melting tank 100 is preferably 20 to 900L; the melting tank 100 is typically provided with a charge in communication with a melting chamber 101A section 102 for continuously or intermittently charging glass raw materials into the melting chamber 101; during the charging, the flow of the molten glass to the clarifying tank 400 is limited by a certain flow rate; since the molten glass composition generally contains Ti ions, nb ions, and the like, the melting tank 100 is preferably made of a high-temperature-resistant and corrosion-resistant material, for example: with aluminium oxide (Al) 2 O 3 ) Quartz (SiO) 2 ) Clay (Al) 2 O 3 +SiO 2 ) And zirconia (ZrO 2 ) And the like as main components.
The electrode 200 is generally manufactured in a cylindrical or columnar structure with a polygonal or circular cross-sectional shape, and the heating temperature of the melting tank 100 of the device is generally controlled to 1180-1300 ℃, and the electrode 200 is generally designed to be a structure which is not easy to deform at high temperature, so that the electrode 200 with a cylindrical structure is preferably manufactured; the electrode 200 may be made of a noble metal or a noble metal alloy, for example: tin oxide, platinum, molybdenum or alloys thereof, and the noble metals mainly refer to gold, silver and platinum group metals; the optical glass itself contains an alkali metal raw material, and has corrosion performance when the optical glass raw material is melted into glass liquid, particularly has stronger corrosion performance at the high temperature of 1180-1300 ℃ in a melting tank 100, has certain corrosion on an electrode 200, and the coloring factor of the electrode 200 on the optical glass must be reduced in the production of high-light-transmittance optical glass, so that the electrode 200 is preferably made of platinum or platinum alloy which is resistant to high temperature and corrosion and has extremely small coloring of the optical glass.
Preferably, the electrode 200 is disposed at a position on the upper edge of the side wall of the melting chamber 101 below the level limit of the molten glass; still preferably, the distance between the electrode 200 and the bottom of the melting chamber 101 is 1/6 to 1/4 of the height of the side wall of the melting chamber 101; the distance between the electrode 200 and the bottom of the melting chamber 101 refers to the distance between the central axis of the electrode 200 and the bottom of the melting chamber 101; the melting chamber 101 is generally cylindrical and the electrodes 200 are disposed radially along the melting chamber 101.
Specifically, as shown in fig. 2, the electrode 200 includes an anode 210 and a cathode 220 correspondingly disposed on the side walls of the melting chamber 101; the number of the anodes 210 is 1-6, and when the number of the anodes 210 is more than two, the anodes 210 are arranged at intervals along the height direction of the side wall of the melting tank 100; the number of cathodes 220 is 1 to 6, and when the number of cathodes 220 is two or more, each cathode 220 is arranged at intervals along the height direction of the side wall of the melting tank 100. Preferably, the number of anodes 210 is equal to the number of cathodes 220, and each anode 210 and each cathode 220 are arranged in a one-to-one correspondence; it is further preferred that anode 210 and cathode 220 are symmetrically disposed. The number of anodes 210 and cathodes 220 provided in the melting tank 200 is generally determined according to the volume and shape of the melting chamber 101 so that the molten glass in the melting chamber 101 can be uniformly heated and the dead corners around the melting chamber 101 can be reduced.
The inventor researches find that if the distance between the corresponding ends of the anode 210 and the cathode 220 is too short, the volume of the electrified heating glass liquid is smaller, so that the glass liquid in the whole melting tank 100 can not be effectively heated, the optical glass can not be continuously melted and produced, and high-quality high-transmittance optical glass can not be obtained; if the distance between the corresponding anode 210 and cathode 220 is too long, the contact or proximity between the wall brick on the side wall of the melting tank 100 and the electrode 200 is easily affected by the high-temperature molten glass heated by the electrode 200, which causes corrosion and affects the transmittance of the produced optical glass. In order to concentrate the heating heat, reduce corrosion to the melting tank 100, and improve transmittance of the produced optical glass, the anode 210 and the cathode 220 are provided with adjustable lengths, and the distance between the ends of the anode 210 and the cathode 220 is 100-800 mm. The lengths of the anode 210 and the cathode 220 can be adjusted, and the anode 210 and the cathode 220 with telescopic structures can be arranged, or the anode 210 and the cathode 220 can be respectively arranged on the side wall of the melting tank 100 in a telescopic way. The inventor verifies that when the distance between the ends of the anode 210 and the cathode 220 is 100-800 mm, the heat of heating can be concentrated, the corrosion to the melting tank 100 can be reduced, and the transmittance of the produced optical glass is high.
As a preferred embodiment of the present invention, as further shown in fig. 1, a melting tank cover 110 is provided at the top of the melting tank 100, and an air lance 120 is provided at the bottom of the melting tank 100; the melting tank cover 110 is provided with a burner 300, and the burner tip of the burner 300 and the discharge of the charging part 102The positions are corresponding. The burner 300 includes a device for simultaneously supplying an auxiliary gas and a combustion gas, preferably methane, ethane, natural gas or several kinds of mixed combustible gases, to the burner tip, and further preferably natural gas as the combustion gas in view of production costs, the auxiliary gas preferably being oxygen, air or other mixed gas, since the glass liquid component contains Ti ions and Nb ions and the like, which are very easily reduced in a reducing gas, for example: ti (Ti) 4+ No absorption in the visible range, but Ti 3+ The glass becomes absorbing, mainly develops brown, and reduces the transmittance of the glass; therefore, the assist gas further preferably selects air or oxygen having an oxidizing atmosphere.
The glass manufacturing apparatus performs atmosphere combustion by the burner tip of the burner 300, and the raw glass material supplied from the primary melting and charging section 102; the burner 300 is usually positioned such that the burner tip is substantially on the same level as the height center line of the charging portion 102, and it is preferable that the burner tip of the burner 300 is positioned at a height 10 to 50mm higher than the height center line of the charging portion 102. Preferably, a plurality of burners 300 are uniformly arranged along the circumferential direction of the melt pool cover 110, and the burner tips of the burners 300 horizontally spray combustion gas toward the central axis of the melt pool cover 110 to burn.
The gas jet pipe 120 arranged at the bottom of the melting tank 100 can jet gas to the molten glass in the melting cavity 101, so that the uniformity of the molten glass in the melting tank 100 can be effectively improved. The number of gas lances 120 is determined by the volume of the melting chamber 101 and the number and distribution of electrodes 200 in the melt pool 100. The gas ejected from the gas jet pipe 120 may be air, oxygen, nitrogen, carbon dioxide, or the like, and since the molten optical glass raw material contains Ti ions, nb ions, or the like, and is easily reduced to a color-developing component to reduce the optical glass transmittance, an oxidizing gas is preferable, so that the oxidizing atmosphere of the optical glass in the melting tank 100 can be maintained, reduction coloring can be avoided, and the optical glass transmittance can be improved.
A method for producing a high-transmittance glass, which comprises producing a high-transmittance glass by using any one of the above glass production apparatuses.
Specifically, the method for manufacturing the high-transmittance optical glass comprises the following steps:
a. preparing glass raw materials, and controlling the distance between the ends of the anode 210 and the cathode 220 to be 100-800 mm;
b. continuously or intermittently charging a glass raw material from a charging portion 102 into a melting chamber 101, and melting the glass raw material by heating by a burner 300 provided on a melting tank cover 110; when the liquid level of the glass liquid is higher than the upper edge of the electrode 200, the electrode 200 is electrified to heat the glass liquid, and the temperature of the glass liquid in the melting cavity 101 is controlled to 1180-1300 ℃; introducing an oxidizing gas through the gas lance 120 to homogenize the glass liquid;
c. the molten glass flowing out of the melting tank 100 is continuously transferred to the fining tank 400 through the first connecting pipe 410, and bubbles are eliminated when the temperature of the molten glass in the fining tank 400 is 1450 + -50 ℃;
d. the molten glass flowing out of the fining bath 400 is continuously transferred to the discharge cell 500 by the second connecting tube 510, and the molten glass in the discharge cell 500 is stripped at 1300.+ -. 50 ℃ and then continuously flows out to form glass strands.
The above-described method for producing a high light transmittance optical glass is particularly suitable for producing an optical glass containing Ti or Nb and containing a certain amount of an alkaline component, for example: na, K, etc., and alkaline ions can be used as charge moving media, which is beneficial to the electrifying and heating of the glass liquid. The manufacturing method of the high-transmittance optical glass is beneficial to manufacturing the high-transmittance optical glass by the glass manufacturing device, because the electrode 200 is arranged on the side wall of the melting cavity 101, the electrode 200 is below the liquid level of glass liquid in the production process, and only the glass liquid contacted with the electrode 200, namely solid phase and liquid phase, is contacted, so that the electrode 200 has stable chemical property and is not easy to oxidize and corrode, and the service life is prolonged; meanwhile, the oxidation corrosion of the electrode 200 is weakened, and the influence on the glass transmittance caused by the fact that the redundant oxidation corrosion part of the electrode 200 enters into glass liquid is prevented, so that the transmittance of the produced optical glass is improved, and the optical glass containing Ti or Nb can be continuously and stably produced.
The apparatus and method of the present invention can be used to manufacture high light transmittance optical glass, such as optical glass of the following composition, in mass percent: siO (SiO) 2 ：20％～50％；BaO：10％～30％；TiO 2 ：10％～30％；Na 2 O：2％～20％；K 2 O：2％～15％；Sb 2 O 3 ：0％～1％；Nb 2 O 5 ：5％～30％；CaO：0％～5％；ZrO 2 :0% -5%. The optical glass contains no PbO and As 2 O 3 And F and other non-environment-friendly raw materials.
Further, siO-containing materials 2 、BaO、TiO 2 、Nb 2 O 5 An optical glass having a refractive index of 1.72 or more and an Abbe's number of 29 or less, and a high refractive index and high dispersion glass having a refractive index of 1.82 or more and an Abbe's number of 25 or less are more preferable.
Examples
The optical glass comprises the following components in percentage by mass: siO (SiO) 2 ：30％，BaO：20％，TiO 2 ：15％，Nb 2 O 5 ：15％，Na 2 O：13％，CaO：3％，ZrO 2 ：3％，Sb 2 O 3 :1, refractive index 1.84444, abbe's dispersion coefficient 23.90, 400nm transmittance 0.74.
The process for manufacturing the optical glass by the method of the invention is as follows:
a glass manufacturing apparatus having a structure including a melting tank 100, an electrode 200, a fining tank 400, and a discharge tank 500;
a melting cavity 101 for melting glass raw materials into glass liquid is arranged in the melting tank 100, and a feeding part 102 communicated with the melting cavity 101 is arranged on the melting tank 100; the top of the melting tank 100 is provided with a melting tank cover 110, and the bottom of the melting tank 100 is provided with an air injection pipe 120; the melting tank cover 110 is provided with a burner 300, and a burner tip of the burner 300 corresponds to a discharging part of the charging part 102;
the electrode 200 is of a cylindrical structure made of platinum, the electrode 200 is arranged on the side wall of the melting cavity 101, the upper edge of the electrode 200 is positioned below the upper limit of the liquid level of molten glass, and the distance between the electrode 200 and the bottom of the melting cavity 101 is 1/6-1/4 of the height of the side wall of the melting cavity 101;
the electrode 200 includes an anode 210 and a cathode 220 symmetrically disposed on the side wall of the melting chamber 101; the number of the anodes 210 is 2, and the anodes are arranged at intervals along the height direction of the side wall of the melting tank 100; the number of the cathodes 220 is 2, and the cathodes are arranged at intervals along the height direction of the side wall of the melting tank 100; the anode 210 and cathode 220 are adjustable in length;
the clarifier 400 is connected with the melting tank 100 through a first connecting pipe 410, and the discharging tank 500 is connected with the clarifier 400 through a second connecting pipe 510;
the method comprises the following specific steps:
a. preparing glass raw materials according to the mass percentage, and controlling the distance between the ends of the anode 210 and the cathode 220 to be 100-800 mm;
b. continuously or intermittently charging a glass raw material from a charging portion 102 into a melting chamber 101, and melting the glass raw material by heating by a burner 300 provided on a melting tank cover 110; when the liquid level of the glass liquid is higher than the upper edge of the electrode 200, the electrode 200 is electrified to heat the glass liquid, and the temperature of the glass liquid in the melting cavity 101 is controlled to 1180-1300 ℃; introducing an oxidizing gas through the gas lance 120 to homogenize the glass liquid;
c. the molten glass flowing out of the melting tank 100 is continuously transferred to the fining tank 400 by the first connecting tube 410, and bubbles are eliminated at 1450 ℃ in the temperature of the molten glass in the fining tank 400;
d. the molten glass flowing out of the fining bath 400 is continuously transferred to the discharge cell 500 by the second connecting tube 510, and the molten glass in the discharge cell 500 is stripped at 1300 ℃ and then continuously flows out to form glass strands.
The optical glass produced by the method of the present invention was tested to have a refractive index of 1.84444.+ -. 0.00050, an Abbe's dispersion coefficient of 23.90.+ -. 0.5% and a transmittance of 0.86.
Claims (5)
1. The glass manufacturing device comprises a melting tank (100) and an electrode (200), wherein a melting cavity (101) for melting glass raw materials into glass liquid is arranged in the melting tank (100); the method is characterized in that: the electrode (200) is arranged on the side wall of the melting cavity (101), the upper edge of the electrode (200) is positioned below the upper limit of the liquid level of molten glass, and the lower edge of the electrode (200) is positioned above the bottom surface of the melting cavity (101);
the distance between the electrode (200) and the bottom of the melting cavity (101) is 1/6-1/4 of the height of the side wall of the melting cavity (101);
the electrode (200) is made of noble metal or noble metal alloy, the electrode (200) is in a cylindrical structure or columnar structure, and the shape of the cross section of the electrode (200) is polygonal or circular;
the electrode (200) comprises an anode (210) and a cathode (220) which are correspondingly arranged on the side wall of the melting cavity (101); the number of the anodes (210) is 1-6, and the anodes are arranged at intervals along the height direction of the side wall of the melting tank (100); the number of the cathodes (220) is 1-6, and the cathodes are arranged at intervals along the height direction of the side wall of the melting tank (100);
the lengths of the anode (210) and the cathode (220) are adjustable, and the distance between the ends of the anode (210) and the cathode (220) is 100-800 mm.
2. The glass manufacturing apparatus of claim 1, wherein: the melting tank (100) is provided with a feeding part (102) communicated with the melting cavity (101).
3. The glass manufacturing apparatus of claim 2, wherein: the top of the melting tank (100) is provided with a melting tank cover (110), and the bottom of the melting tank (100) is provided with an air jet pipe (120); the melting tank cover (110) is provided with a burner (300), and a burner tip of the burner (300) corresponds to a discharging part of the feeding part (102).
4. The glass manufacturing apparatus of claim 1, wherein: the device further comprises a clarifying tank (400) and a discharging tank (500), wherein the clarifying tank (400) is connected with the melting tank (100) through a first connecting pipe (410), and the discharging tank (500) is connected with the clarifying tank (400) through a second connecting pipe (510).
5. The manufacturing method of the high-transmittance optical glass is characterized in that: manufacturing a high transmittance optical glass using the glass manufacturing apparatus according to any one of claims 1 to 4;
the manufacturing method of the high-transmittance optical glass comprises the following steps:
a. preparing glass raw materials, and controlling the distance between the ends of the anode (210) and the cathode (220) to be 100-800 mm;
b. continuously or intermittently charging a glass raw material from a charging portion (102) into a melting chamber (101), and melting the glass raw material by heating with a burner (300) provided on a melting tank cover (110); when the liquid level of the glass liquid is higher than the upper edge of the electrode (200), the electrode (200) is electrified to heat the glass liquid, and the temperature of the glass liquid in the melting cavity (101) is controlled to be 1180-1300 ℃; introducing an oxidizing gas through the gas lance (120) to homogenize the glass liquid;
c. the molten glass flowing out of the melting tank (100) is continuously conveyed to the clarifying tank (400) through a first connecting pipe (410), and bubbles are eliminated when the temperature of the molten glass in the clarifying tank (400) is 1450+/-50 ℃;
d. the glass liquid flowing out of the clarifying tank (400) is continuously conveyed to the discharging tank (500) by the second connecting pipe (510), the glass liquid in the discharging tank (500) eliminates stripes at 1300+/-50 ℃, and then continuously flows out to form glass strips.
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| CN109721222B (en) * | 2019-02-19 | 2022-03-04 | 东旭光电科技股份有限公司 | Glass kiln and control method thereof |
| CN111204955A (en) * | 2020-01-16 | 2020-05-29 | 成都光明光电股份有限公司 | Method for producing optical glass |
| CN112321135B (en) * | 2020-09-28 | 2022-07-26 | 江苏孚日玻璃科技有限公司 | Environment-friendly, energy-saving and heat-insulating glass kiln and working method thereof |
| CN112938498B (en) * | 2021-01-27 | 2023-01-10 | 重庆恒安心相印纸制品有限公司 | Anti-blocking device for paper product processing |
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