WO2014077114A1 - Procédé de fabrication de verre sans alcali - Google Patents

Procédé de fabrication de verre sans alcali Download PDF

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Publication number
WO2014077114A1
WO2014077114A1 PCT/JP2013/079170 JP2013079170W WO2014077114A1 WO 2014077114 A1 WO2014077114 A1 WO 2014077114A1 JP 2013079170 W JP2013079170 W JP 2013079170W WO 2014077114 A1 WO2014077114 A1 WO 2014077114A1
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Prior art keywords
exhaust gas
glass
liquid
recovered
powder
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PCT/JP2013/079170
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English (en)
Japanese (ja)
Inventor
良太 安藤
畑　雅之
裕丈 石原
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旭硝子株式会社
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Application filed by 旭硝子株式会社 filed Critical 旭硝子株式会社
Priority to KR1020157011246A priority Critical patent/KR102086435B1/ko
Priority to JP2014546925A priority patent/JP6075383B2/ja
Priority to CN201380059794.2A priority patent/CN104797537B/zh
Publication of WO2014077114A1 publication Critical patent/WO2014077114A1/fr

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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
    • C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
    • C03C3/089—Glass compositions containing silica with 40% to 90% silica, by weight containing boron
    • C03C3/091—Glass compositions containing silica with 40% to 90% silica, by weight containing boron containing aluminium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/40—Alkaline earth metal or magnesium compounds
    • B01D2251/402—Alkaline earth metal or magnesium compounds of magnesium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/40—Alkaline earth metal or magnesium compounds
    • B01D2251/404—Alkaline earth metal or magnesium compounds of calcium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/60—Inorganic bases or salts
    • B01D2251/606—Carbonates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2258/00—Sources of waste gases
    • B01D2258/02—Other waste gases
    • B01D2258/0241—Other waste gases from glass manufacture plants
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
    • B01D53/48—Sulfur compounds
    • B01D53/50—Sulfur oxides
    • B01D53/508—Sulfur oxides by treating the gases with solids
    • 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
    • C03B5/005—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture of glass-forming waste materials
    • 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

Definitions

  • the present invention relates to a method for producing alkali-free glass.
  • various components derived from glass raw materials are contained in exhaust gas discharged from a glass melting furnace.
  • a boron component containing boron (B) is contained in the exhaust gas.
  • the sulfur component containing sulfur (S) is often contained. If these components are released into the atmosphere as they are, there is a risk of adverse effects on the environment, and various methods for removing these components from exhaust gas have been studied.
  • non-alkali glass substantially free of alkali metal oxide is used for various display glass substrates and the like.
  • Patent Document 1 discloses a method for removing boron and sulfur components from exhaust gas by dissolving the boron component and sulfur component in the exhaust gas in water by bringing cooling water and contact water into contact with the exhaust gas. Are listed.
  • the effluent containing the boron component and sulfur component generated by this method can be reused as cooling water or contact water after neutralization.
  • NaOH is used as a neutralizing agent for drainage, and no precipitate is generated due to neutralization. Therefore, the neutralized drainage is used as it is as a part of cooling water or contact water. Can be reused. Moreover, since the boron component etc. which are contained in exhaust gas are useful as a glass raw material, collect
  • Patent Document 2 a fuel that does not substantially contain sulfur is used as a fuel for heating and melting a glass raw material, and an exhaust gas from a glass melting furnace is brought into contact with water to form a collection liquid.
  • a method of recovering arsenic, boron, and chlorine components useful as glass materials by neutralizing the liquid to obtain a neutralized collection liquid, followed by solid-liquid separation of the neutralized collection liquid and drying by heating. are listed.
  • Patent Document 1 when NaOH is used as a neutralizing agent for drainage, sodium salt that is an alkali metal salt is contained in the drained liquid after neutralization.
  • the neutralized effluent contains boron and sulfur components that can be reused as glass raw materials, but also contains alkali metal salts. Use this effluent for the production of alkali-free glass. Is not suitable.
  • a spray dryer is used as a solid-liquid separation means, and the useful components recovered are mainly a relatively large solid content of several hundred ⁇ m or more. If the solid content is relatively large, it may be difficult to mix homogeneously with other components when reused as a glass raw material.
  • One object of the present invention is to recover a reusable component in powder form from exhaust gas discharged from a glass melting furnace and to provide a method for producing alkali-free glass whose composition is suitable as a glass raw material
  • SiO 2 50 to 73%, Al 2 O 3 : 10.5 to 24%, B 2 O 3 : 0.1 to 12%, MgO: 0.5-10%, CaO: 0.5-14.5%, SrO: 0-24%, BaO: 0-13.5%, ZrO 2 : 0-5%, Cl: 0.01-0. 35%, F: 0.01-0.15%, and SO 3 : 0.0001-0.0025%, MgO + CaO + SrO + BaO: 8-29.5%, MgO / (MgO + CaO): 0.1-0.
  • a method for producing an alkali-free glass a step of melting a glass raw material to collect exhaust gas, a step of bringing a cooling liquid into contact with the exhaust gas to cool the exhaust gas, and CaCO 3 to the cooled exhaust gas.
  • a reusable component is recovered in powder form from exhaust gas discharged from a glass melting furnace, and a method for producing alkali-free glass whose composition is suitable as a glass raw material is provided. it can.
  • FIG. 1 shows a flow chart of an example of a method for producing glass according to an embodiment of the present invention.
  • FIG. 2 shows a schematic diagram of a production line as an example of a glass production method according to an embodiment of the present invention.
  • FIG. 3 shows an example flow diagram for manufacturing a glass product according to one embodiment of the present invention.
  • FIG. 1 shows a flow chart of an example of a method for producing an alkali-free glass (hereinafter sometimes simply referred to as “glass”) of the present embodiment.
  • the glass raw material is melted at 1001 to collect the exhaust gas, and the exhaust gas is cooled by bringing the cooling liquid into contact with the exhaust gas at 1002, and the COCO 3 , Ca (OH) 2 and ( One or more selected from the group consisting of (Ca, Mg) CO 3 (hereinafter sometimes simply referred to as “Ca compound”) is added, and the recovered powder is recovered from the exhaust gas using a dust collecting member,
  • Ca (OH) 2 and water are brought into contact with the exhaust gas after the powder is recovered, and the components contained in the exhaust gas are recovered as a recovery liquid.
  • 1004 is also referred to as a Mg (OH) 2 treatment step.
  • exhaust gas can be exhausted after the recovered liquid is recovered at 1004.
  • the recovered liquid recovered in 1004 is used as a cooling liquid in the process of cooling the exhaust gas in 1002. Further, the recovered powder recovered in 1003 may be used as a glass raw material in 1001 and circulated in the system. Further, the recovered powder may be taken out for use in another system without being circulated in the system.
  • a reusable component is recovered in powder form from the exhaust gas discharged by melting the glass, and a glass manufacturing method whose composition is suitable as a glass raw material can be provided.
  • a glass manufacturing method whose composition is suitable as a glass raw material can be provided.
  • the Mg component added in the 1004 Mg (OH) 2 treatment step circulates in the system, and can be recovered as a powder together with the Ca component added in the powder recovery step.
  • the composition of the recovered powder includes not only the Ca component but also the Mg component, a composition that can be easily reused as a glass raw material can be provided.
  • the recovered powder recovered in 1003 is in the form of a powder having an average particle diameter (D50) of 30 to 100 ⁇ m, the range of usage when reusing as a glass raw material can be expanded. That is, it can be used as it is as a powder, a separate component can be added to the powder, and a granulated body can be produced and used. Moreover, when the particle diameter of the powder is small, it can be more uniformly mixed with other components when reused as a glass raw material.
  • D50 average particle diameter
  • the recovered liquid can be recovered in the form of a solution by recovering the recovered liquid with Mg (OH) 2 and water.
  • the slurry liquid may damage the pipes and nozzles when passing through the pipes in the system and the nozzles used when spraying the liquid in each process, so the recovered liquid may be in the form of a solution. desirable.
  • Magnesium hydroxide is used as a neutralizing agent for general acid drainage because it is cheap and easy to handle, but its solubility in water is low and it is usually in a slurry state. When doing so, there is a concern of clogging of piping.
  • the inventors of the present invention have obtained the knowledge that when magnesium hydroxide slurry is added to a liquid containing a boron component, an aqueous solution is obtained despite containing magnesium.
  • the component derived from the fining agent can be recovered as a powder, and can be reused as a glass raw material.
  • the fluorine (F) component derived from the fining agent can be removed in the powder recovery step.
  • the powder recovered by the powder recovery process 1003 is in a dry state and does not require heat treatment, and can be used as it is as a glass raw material.
  • the glass produced according to the present embodiment has a mass percentage based on oxides of SiO 2 : 50 to 73%, Al 2 O 3 : 10.5 to 24%, B 2 O 3 : 0.1 to 12%, Preferably 0.3 to 12%, more preferably 0.5 to 12%, MgO: 0.5 to 10%, CaO: 0.5 to 14.5%, SrO: 0 to 24%, BaO: 0 to 13.5%, ZrO 2 : 0 to 5%, Cl: 0.01 to 0.35%, F: 0.01 to 0.15%, and SO 3 : 0.0001 to 0.0025%, MgO + CaO + SrO + BaO: 8 to 29.5%, MgO / (MgO + CaO): 0.1 to 0.8.
  • This glass composition is a composition of solid glass obtained by melting and solidifying a glass raw material.
  • Glass having such a glass composition can be used as non-alkali glass (hereinafter also referred to as non-alkali borosilicate glass).
  • the total content of alkali metal oxides is preferably 1% or less, more preferably 0.1% or less, and the alkali metal oxide is substantially reduced. It is preferably not included.
  • the alkaline earth metal mainly means calcium (Ca), strontium (Sr), and barium (Ba).
  • Alkali metal mainly means lithium (Li), sodium (Na), and potassium (K).
  • the “boron component” is a general term for components containing a boron atom (B) (the same applies to other components).
  • SiO 2 is a glass network former and is an essential component. SiO 2 is highly effective in increasing the acid resistance of the glass and reducing the density of the glass. The content is generally 73% or less, preferably 66% or less, considering that the viscosity of the molten glass becomes too high and it becomes difficult to produce the molten glass by a normal melting method. More preferably, it is 61.5% or less. On the other hand, if the amount of SiO 2 is too small, it may cause deterioration of acid resistance, increase in linear expansion coefficient, etc., so in the case of display substrate glass, its content is preferably 50% or more, more preferably 54%. Or more, more preferably 58% or more.
  • Al 2 O 3 is a component used for the purpose of increasing the strain point of the glass and suppressing the phase separation of the glass.
  • the content of Al 2 O 3 is preferably 10.5% or more, more preferably 15% or more.
  • the content of Al 2 O 3 is preferably 24% or less, more preferably 22.5% or less from the viewpoint of avoiding high viscosity of molten glass, devitrification characteristics of glass, and deterioration of acid resistance. More preferably, it is 22% or less, and more preferably 15% or less.
  • B 2 O 3 is a glass network former, and is also a component that improves the dissolution reactivity in melt vitrification.
  • the content of B 2 O 3 is 0.1 to 12%, preferably 0.3 to 12%, more preferably 0.5% or more, still more preferably 5% or more, and particularly preferably 7%. % Or more.
  • B 2 O 3 may reduce the acid resistance of the glass and is usually 12% or less.
  • the content of B 2 O 3 is preferably 10% or less, more preferably. 8% or less.
  • MgO is a component that lowers the viscosity of molten glass, lowers the density of glass, does not increase the linear expansion coefficient, and improves melting reactivity. It is an essential component when manufacturing a substrate.
  • the content of MgO is 0.5% or more, preferably 1% or more, more preferably 2% or more, and still more preferably 4% or more.
  • the content is 10% or less, more preferably 8% or less, and further preferably 5% or less from the viewpoint of increasing acid resistance.
  • CaO is a component that lowers the viscosity of molten glass, and is a component that may be used for the purpose of adjusting glass properties such as density, linear expansion coefficient, and strain point.
  • the content of CaO is preferably 0.5% or more, more preferably 1% or more, further preferably 2% or more, and still more preferably 4% or more.
  • the content is preferably 14.5% or less, more preferably 10% or less, and still more preferably 9% or less, from the viewpoint of avoiding deterioration of the devitrification characteristics of the glass, increase of the linear expansion coefficient, and the like. It is.
  • [SrO] SrO is a component that lowers the viscosity of the molten glass, and is a component that may be included to improve the devitrification properties and acid resistance of the glass.
  • the content is preferably 1% or more, more preferably 2% or more, and still more preferably 3% or more.
  • the content is preferably 24% or less, more preferably 16% or less, still more preferably 12.5% or less, and even more preferably 6% or less.
  • BaO is a component that lowers the viscosity of the molten glass, and is a component that can be added for the purpose of, for example, phase separation of glass, improvement of devitrification characteristics, and improvement of acid resistance.
  • the glass is a glass substrate for liquid crystal in order to increase the density or the like, it is preferable to make the content inevitable.
  • the content when BaO is positively contained is preferably 13.5% or less, more preferably 10% or less, still more preferably 5% or less, and still more preferably 2% or less.
  • ZrO 2 ] ZrO 2 is not essential, but may be contained at 5% or less in order to lower the glass melting temperature or to promote crystal precipitation during firing. By being 5% or less, the glass can be stabilized and ⁇ can be reduced. Preferably it is 3% or less.
  • [Cl] Cl is a component added for defoaming as a fining agent, and is contained at 0.01% to 0.35%. From the viewpoint of defoaming and re-boiling suppression, it is more preferably 0.30% or less, and still more preferably 0.25% or less. In order to further promote defoaming, it is more preferably 0.05% or more, further preferably 0.1% or more.
  • F is a component added for defoaming as a fining agent, and is contained at 0.01 to 0.15%.
  • F has an effect of reducing the surface tension of the molten glass and easily breaking bubbles existing on the surface of the molten glass, or an effect of reducing minute bubbles in the molten glass. From the viewpoint of defoaming and re-boiling suppression, it is more preferably 0.10% or less, and still more preferably 0.05% or less. In order to further promote defoaming, the content is more preferably 0.02% or more, further preferably 0.03% or more.
  • [SO 3 ] SO 3 is added as a fining agent and is a component that promotes defoaming or melting of the glass raw material, and is contained at 0.0001 to 0.0025%. From the viewpoint of suppressing re-boiling, it is more preferably 0.0010% or less. When it is desired to further promote defoaming or melting of the glass raw material, it is more preferable to contain 0.0012% or more of SO 3 .
  • the SO 3 content is usually carried out by adding a sulfate such as bow glass to the glass raw material. In addition, for example, in heavy oil combustion kilns, it is also caused by S-containing impurities in heavy oil.
  • MgO + CaO + SrO + BaO If the total content of MgO, CaO, SrO and BaO (MgO + CaO + SrO + BaO) is small, the viscosity of the molten glass increases and the melting reactivity deteriorates.
  • the total content of these is preferably 8% or more, more preferably 9% or more, and further preferably 16% or more.
  • the total content thereof is preferably 29.5% or less, more preferably 26% or less, still more preferably 18% or less, even more. Preferably it is 15% or less.
  • MgO / (MgO + CaO)] MgO / (MgO + CaO) obtained by dividing the content of MgO by the total content of MgO and CaO is preferably 0.1 to 0.8 in terms of the mass ratio based on the oxide. By being 0.2 or more, an increase in specific gravity and an increase in expansion coefficient can be prevented. From the viewpoint of strain point and solubility, it is more preferably 0.25 to 0.55, still more preferably 0.3 to 0.5, and still more preferably 0.3 to 0.4.
  • glass component that can be contained are not particularly limited, and may include a solubilizer, a molding agent, and the like.
  • a clarifier components other than the above-described Cl, F, and SO 3 may be included.
  • Fe 2 O 3, TiO 2 , Y 2 O 3 or the like may be appropriately contained.
  • glass composition From the viewpoint of increasing the strain point and the solubility, more preferable examples of the glass composition include SiO 2 : 58 to 66%, Al 2 O 3 : 15 to 22%, B 2 O in terms of mass percentage based on oxide. 3 : 5 to 12%, MgO: 0.5 to 8%, CaO: 0.5 to 9%, SrO: 3 to 12.5%, BaO: 0 to 2%, Cl: 0.01 to 0.35 %, F: 0.01 to 0.15%, and SO 3 : 0.0001 to 0.0025%, MgO + CaO + SrO + BaO: 9 to 18%, MgO / (MgO + CaO): 0.35 to 0.55 .
  • the glass composition from the viewpoint of increasing the solubility include SiO 2 : 50 to 61.5%, Al 2 O 3 : 10.5 to 18%, and B 2 O 3 : 7 to 10%, MgO: 2 to 5%, CaO: 0.5 to 14.5%, SrO: 0 to 24%, BaO: 0 to 13.5%, Cl: 0.01 to 0 .35%, F: 0.01 to 0.15%, and SO 3 : 0.0001 to 0.0025%, MgO + CaO + SrO + BaO: 16 to 29.5%, MgO / (MgO + CaO): 0.3 to 0 .5.
  • more preferable examples of the glass composition include SiO 2 : 54 to 73%, Al 2 O 3 : 10.5 to 22.5%, B 2 2 O 3 : 0.1 to 12%, preferably 0.3 to 12%, more preferably 0.5 to 5.5%, MgO: 0.5 to 10%, CaO: 0.5 to 9%, SrO: 0 to 16%, BaO: 0 to 2.5%, Cl: 0.01 to 0.35%, F: 0.01 to 0.15%, and SO 3 : 0.0001 to 0.0025% MgO + CaO + SrO + BaO: 8 to 26%, MgO / (MgO + CaO): 0.3 to 0.8.
  • the glass raw material is a compound that can be an oxide as a glass component, and may be in the form of a powder or a granulated body.
  • the glass raw material may contain the following silicon source, aluminum source, boron source and the like. Known raw material powders can be appropriately selected and used.
  • the composition of the glass raw material can be designed so as to obtain the desired glass composition.
  • the composition of the glass raw material is substantially the same as the glass composition to be obtained on the oxide basis, except for boron oxide.
  • Boron oxide is preferably blended so that the amount of boron source in the glass raw material is increased on an oxide basis, usually by an amount considering the volatile content, compared to the boron oxide content in the glass composition to be obtained.
  • the glass raw material can contain a clarifying agent, a colorant, a melting aid, an opacifier, etc. as auxiliary raw materials as required.
  • auxiliary raw materials known components can be appropriately used.
  • the fining agent component is volatilized and collected as exhaust gas in the glass melting step, and can be recovered as a recovered powder. In that case, the recovered powder can be used as a fining agent raw material.
  • the raw material powder as a silicon source is a powder of a compound that can be a SiO 2 component during the glass production process. Silica sand is preferably used as the silicon source.
  • the raw material powder as the aluminum source is a powder of a compound that can be an Al 2 O 3 component during the glass production process.
  • Aluminum oxide, aluminum hydroxide and the like are preferably used. These may be used alone or in combination of two or more.
  • the raw material powder as a boron source is a powder of a compound that can be a B 2 O 3 component during the glass production process.
  • Specific examples include boric acid such as orthoboric acid (H 3 BO 3 ), metaboric acid (HBO 2 ), tetraboric acid (H 2 B 4 O 7 ), boron oxide (B 2 O 3 ), and colemanite. It is done. These may be used alone or in combination of two or more.
  • Orthoboric acid is preferred because it is inexpensive and easily available.
  • Colemanite is also a calcium source described later.
  • the raw material powder as the magnesium source is a powder of a compound that can be an MgO component during the glass production process.
  • Specific examples include magnesium oxide (MgO), magnesium hydroxide (Mg (OH) 2 ), magnesium carbonate (MgCO 3 ), and the like.
  • the raw material powder as the alkaline earth metal source is a powder of a compound that can be SrO, CaO, or BaO during the glass production process.
  • carbonates such as calcium carbonate (CaCO 3 ), barium carbonate (BaCO 3 ), strontium carbonate (SrCO 3 ), dolomite (ideal chemical composition: CaMg (CO 3 ) 2 ); calcium oxide (CaO), Oxides such as barium oxide (BaO) and strontium oxide (SrO); calcium hydroxide (Ca (OH) 2 ), barium hydroxide (Ba (OH) 2 ), strontium hydroxide (Sr (OH) 2 ) and the like Hydroxides. These may be used alone or in combination of two or more. Dolomite is also the aforementioned magnesium source.
  • the raw material powder as a zirconia source is a powder of a compound that can be a ZrO 2 component during the glass production process.
  • Examples of the zirconia source include zirconium dioxide and zircon.
  • the glass raw material can contain sulfate, chloride, or fluoride, for example, as a fining agent. These may use 1 type and may use 2 or more types.
  • sulfate, chloride, or fluoride a compound containing an oxide cation constituting glass can be used.
  • Mg or alkaline earth metal sulfate, chloride, or fluoride can be used.
  • Mg sulfate, chloride, or fluoride is the source of magnesium.
  • the alkaline earth metal sulfate, chloride, or fluoride is the source of the alkaline earth metal.
  • FIG. 2 is a diagram schematically showing a production line which is an example of the glass production method of the present embodiment.
  • the production line shown in FIG. 2 includes a glass melting furnace 1, a first cooling tower 2, a bag filter 3 as a dust collecting member, a second cooling tower 4, a scrubber (exhaust gas cleaning device) 6, a centrifugal dust collector 8, a chimney 10, A recovery liquid tank 14, a Mg (OH) 2 addition device 16, a circulation pump 17, a Ca compound supply device 18, and a recovery powder tank 19 are provided.
  • the present embodiment includes a step of melting a glass raw material and collecting exhaust gas.
  • the glass raw material may be in the form of a powder or a granulated body.
  • a glass raw material is charged into the glass melting furnace 1 and melted to obtain molten glass.
  • the glass melting method include a normal melting method using an Siemens type glass melting furnace, an air melting method, and the like. In this embodiment, the ordinary melting method is preferable.
  • Air melting method In the air melting method, at least a part of glass particles (including a granulated body) contained in a glass raw material is melted into a molten glass particle in a gas phase atmosphere, and the molten glass particles are accumulated to form a molten glass. Is the method. Specifically, first, a glass raw material is introduced into a high-temperature gas phase atmosphere of an air heating device. A well-known thing can be used for an air heating apparatus.
  • the exhaust gas generated in the melting process of the glass raw material in the present embodiment is the exhaust gas G0 generated from the glass melting furnace 1 in FIG.
  • the exhaust gas G0 includes gas components derived from the constituent components of the glass raw material charged into the glass melting furnace 1.
  • a boron component can be mainly cited.
  • the boron component in the exhaust gas G0 is, for example, boric acid or boron oxide.
  • the exhaust gas G0 includes components derived from fining agents, such as components containing sulfur atoms (S) (also referred to as sulfur components), components containing chlorine atoms (Cl) (also referred to as chlorine components), fluorine atoms (F). May contain a component (also referred to as a fluorine component) or the like. Further, when a fuel containing sulfur such as heavy oil is burned in the glass melting furnace 1, the exhaust gas G0 contains a sulfur component derived from this fuel.
  • S sulfur atoms
  • Cl chlorine atoms
  • F fluorine atoms
  • Sulfur components in the exhaust gas G0 are mainly oxides (SO x ).
  • the chlorine component in the exhaust gas G0 is mainly HCl.
  • the fluorine component in the exhaust gas G0 is mainly HF.
  • the method of the present embodiment is also suitable when the exhaust gas G0 contains a sulfur component and / or a chlorine component in addition to the boron component, and these components are recovered as a magnesium salt in the Mg (OH) 2 treatment step.
  • the exhaust gas G0 contains a sulfur component and / or a chlorine component in addition to the boron component, and these components are recovered as a magnesium salt in the Mg (OH) 2 treatment step.
  • the recovered MgSO 4 and / or MgCl 2 to be reused as a magnesium source and as sulfate and / or chloride as a fining agent.
  • the fluorine component when the fluorine component is contained in the exhaust gas G0, the fluorine component is adsorbed to the Ca compound in the bag filter 3 in front of the second cooling tower 4 and the scrubber 6 that performs the Mg (OH) 2 treatment, and is used as a recovered powder. It can be recovered. Therefore, a fluorine component is magnesium salt (MgF 2), it is possible to prevent contained as solids in the recovery liquid.
  • MgF 2 magnesium salt
  • the present embodiment includes a step of cooling the exhaust gas by bringing the cooling liquid into contact with the exhaust gas.
  • the exhaust gas G0 collected from the glass melting furnace 1 is supplied to the first cooling tower 2 through a pipe, and the cooling liquid is brought into contact with the exhaust gas G0 in the first cooling tower 2 to cool the exhaust gas G0.
  • the temperature of the exhaust gas G1 supplied to the subsequent bag filter 3 can be lowered, and the bag filter 3 can be prevented from being damaged by heat. For example, damage to the furnace cloth portion of the bag filter 3 can be prevented, and the life of the furnace cloth can be extended.
  • the temperature of the exhaust gas G0 immediately before being supplied to the first cooling tower 2 is not particularly limited.
  • the temperature of the exhaust gas G0 is usually 1000 to 1600 ° C. in a state where the exhaust gas is collected from the glass melting furnace 1, and may be supplied to the first cooling tower 2 at that temperature. Further, it may be 350 to 1000 ° C. by being cooled to some extent by piping or the like.
  • the cooling liquid is brought into contact with the exhaust gas G0.
  • a nozzle can be provided in the upper part in the 1st cooling tower 2, and the liquid for cooling can be sprayed to exhaust gas G0 from a nozzle.
  • the temperature decreases, and the exhaust gas G0 is discharged as the exhaust gas G1 after cooling.
  • a part of the components in the exhaust gas G0 may be dissolved in the cooling liquid.
  • the cooling liquid in contact with the exhaust gas G0 is dispersed in the exhaust gas G0 and supplied to the subsequent bag filter 3 as the exhaust gas G1.
  • a part of the cooling liquid is stored at the bottom of the first cooling tower 2, it may be sprayed again on the exhaust gas G0.
  • the recovered liquid recovered in the Mg (OH) 2 processing step described later is used as the cooling liquid.
  • This recovered liquid is preferably an aqueous liquid mainly containing water and Mg salt. Since the recovered liquid has a small solid content, it is possible to prevent damage to the piping and the apparatus due to the solid content. In particular, damage to the nozzles of the first cooling tower 2 can be prevented.
  • the cooling liquid is not particularly limited in the initial stage of the production line, and a liquid that can cool the exhaust gas G0 by contacting with the exhaust gas G0 can be used.
  • a liquid that can cool the exhaust gas G0 by contacting with the exhaust gas G0 can be used.
  • those that dissolve the components in the exhaust gas G0 are preferred, and water (industrial water, distilled water, etc.) or aqueous solutions (the solute is acceptable as a component in the glass raw material) are preferred.
  • these cooling liquids may be used in combination.
  • the temperature of the exhaust gas G1 after cooling is preferably 350 ° C. or lower, and more preferably 250 ° C. or lower. This can prevent the material of the subsequent device from being damaged by heating.
  • the lower limit of the temperature of the exhaust gas G1 after cooling is preferably in a temperature range in which components in the gas do not precipitate. For example, 150 degreeC or more is preferable and 180 degreeC or more is more preferable.
  • the cooled exhaust gas is selected from the group consisting of CaCO 3 , Ca (OH) 2 (also referred to as slaked lime) and (Ca, Mg) CO 3 (also referred to as dolomite).
  • the exhaust gas G1 from the first cooling tower 2 is supplied to the bag filter 3 through a pipe, and the Ca compound is added from the Ca compound supply unit 18 between them, and the recovered powder is recovered from the exhaust gas G1 by the bag filter 3. to recover.
  • Reference symbol G ⁇ b> 2 in the figure indicates exhaust gas before being exhausted from the bag filter 3 and supplied to the second cooling tower 4.
  • the recovered powder is supplied to the recovered powder tank 19. Thereafter, as described later, it is supplied to the glass melting furnace 1 and can be reused as a glass raw material. Note that the recovered powder tank 19 may be directly supplied to the glass melting furnace 1 by piping without providing the recovered powder tank 19.
  • CaCO 3 , Ca (OH) 2 and (Ca, Mg) CO 3 can be supplied alone or in combination. These are preferably supplied in an amount of 1.0 to 5.0 g, more preferably 2.0 to 3.0 g, with respect to 1 Nm 3 of the exhaust gas G1.
  • the Ca compound is Ca (OH ) 2 and / or CaCO 3 are preferred, and Ca (OH) 2 is more preferred.
  • ⁇ -OH is water contained in the molten glass, and if it is contained in the glass, the combustion efficiency may be lowered.
  • a well-known bag filter 3 can be used as appropriate. By providing the bag filter 3, the solid content in the exhaust gas G1 can be removed.
  • the above-described Ca compound is supplied into the exhaust gas G1 in the path from the first cooling tower 2 to the bag filter 3, thereby removing the fluorine component in the exhaust gas G1.
  • the Ca compound may be added in powder form.
  • the Ca compound is removed by the bag filter 3 together with the fluorine component after adsorbing the fluorine component in the exhaust gas G1.
  • the concentration of the fluorine component contained in the exhaust gas G2 after powder recovery is preferably 30 mg / Nm 3 or less, more preferably 10 mg / Nm 3 or less, and even more preferably 5 mg / Nm 3. It is as follows. As a result, it is possible to prevent the fluorine component from being mixed in the subsequent Mg (OH) 2 treatment process and to prevent the formation of a magnesium salt (MgF 2 ) that is hardly soluble in water. Further, the recovered powder recovered by the bag filter 3 contains a fluorine component, and when this is reused as a glass raw material, a composition containing the fluorine component as a refining agent can be provided.
  • the concentration of the fluorine component can be obtained from the amount of fluorine component per 1 Nm 3 of the exhaust gas by collecting the exhaust gas with a metering pump and absorbing it into the absorption liquid, measuring the concentration of the fluorine component in the solution with ICP.
  • this embodiment includes a step of bringing Mg (OH) 2 and water into contact with the exhaust gas from which the powder has been recovered to recover the components contained in the exhaust gas as a recovery liquid.
  • the exhaust gas G2 is supplied to the second cooling tower 4, and the first contact liquid L1 is brought into contact with the exhaust gas G2 in the second cooling tower 4. Then, the exhaust gas G3 is supplied to the scrubber 6, and the second contact liquid L2 is then brought into contact with the exhaust gas G3 in the scrubber 6.
  • the first contact liquid L1 and the second contact liquid L2 contain Mg (OH) 2 and water, and after being processed by the second cooling tower 4 and the scrubber 6, the first recovery liquid S1 and the second recovery liquid S1 The recovered liquid S2 is recovered in the recovered liquid tank 14.
  • the first contact liquid L1 and the second contact liquid L2 contain Mg (OH) 2 as a neutralizing agent.
  • the first recovered liquid S1 and the second recovered liquid S2 circulate in the system.
  • the neutralizing agent contains a Ca component
  • a precipitate such as gypsum and calcium borate is generated in the recovery liquid tank 14.
  • Such a deposit adheres to the bottom of the recovery liquid tank 14, the bottom of the first cooling tower 2, the bottom of the second cooling tower 4, the bottom of the scrubber 6, and the pipes connecting them, the nozzles of each device, and the like. And may be closed. Therefore, it is desirable that no Ca component is contained as a neutralizing agent.
  • the glass composition according to the present embodiment includes a predetermined amount of MgO.
  • MgO calcium hydroxide
  • the temperature of the exhaust gas G2 immediately before being supplied to the second cooling tower 4 is not particularly limited. For example, 130 to 180 ° C. is preferable.
  • the first contact liquid L1 is brought into contact with the exhaust gas G2.
  • the second cooling tower 4 includes an introduction pipe part 4a into which the exhaust gas G2 is introduced from the upper part, and a cooling tower in which the exhaust gas G2 supplied from the introduction pipe part 4a is introduced from the lower part and discharged to the upper part. Part 4b.
  • the first contact liquid L1 is sprayed in the flow direction of the exhaust gas G2 from the nozzle provided in the upper portion of the introduction portion 4a, and is in the direction opposite to the flow of the exhaust gas G2 from the nozzle provided in the lower portion of the cooling tower portion 4b. Sprayed on.
  • the temperature of the exhaust gas G2 is lowered by contacting with the first contact liquid L1, and is discharged as exhaust gas G3 after cooling. At this time, a part of the components in the exhaust gas G2 may be dissolved in the first contact liquid L1.
  • the first contact liquid L1 that has come into contact with the exhaust gas G2 is stored as a first recovered liquid S1 at the bottom of the second cooling tower 4.
  • the first contact liquid L1 is preferably a liquid containing water and Mg (OH) 2 .
  • the second contact liquid L2 described later is a liquid containing water and Mg (OH) 2
  • the first contact liquid L1 is not limited to a liquid containing water and Mg (OH) 2
  • the exhaust gas G2 What is necessary is just to be able to cool the exhaust gas G2 by contacting with.
  • what dissolves the components in the exhaust gas G2 is preferable, and water (industrial water, distilled water, etc.) or an aqueous solution (solute is acceptable as a component in the glass raw material) is preferable.
  • the first contact liquid L1 at the start of operation is water, and a part of the recovered liquid recovered in the recovery liquid tank 14 described later can be reused as the first contact liquid L1. it can.
  • the temperature of the exhaust gas G3 after cooling is preferably 80 ° C. or lower, and more preferably 70 ° C. or lower. This can prevent subsequent devices from being damaged by heat.
  • the lower limit of the temperature of the exhaust gas G3 after cooling is preferably within a temperature range in which components in the gas are not precipitated. For example, 40 degreeC or more is preferable and 60 degreeC or more is more preferable.
  • the exhaust gas G3 is supplied to the scrubber 6 through the pipe 5.
  • a known scrubber exhaust gas cleaning device
  • a venturi scrubber can be used.
  • the second contact liquid L2 is brought into contact with the exhaust gas G3 after cooling.
  • a nozzle can be provided in the upper part of the scrubber 6 to spray the second contact liquid L2.
  • the sulfur component and / or chlorine component in the exhaust gas G3 after cooling is dissolved in the second contact liquid L2.
  • the second contact liquid L2 is preferably a liquid containing water and Mg (OH) 2 .
  • the first contact liquid L1 described above is a liquid containing water and Mg (OH) 2
  • the second contact liquid L2 is not limited to a liquid containing water and Mg (OH) 2 , and the exhaust gas G3. Is used, which can dissolve at least the boron component in the exhaust gas G3 and remove it from the gas. In this case, water (industrial water, distilled water, etc.) or an aqueous solution (a solute is acceptable as a component in the glass raw material) is preferable.
  • the second contact liquid L2 at the start of operation is water, and the recovered liquid recovered in the recovery liquid tank 14 described later can be reused as the second contact liquid L2.
  • the second contact liquid L2 of the first contact liquid L1 and the second contact liquid L2 is more preferably a liquid containing water and Mg (OH) 2.
  • both are liquids containing water and Mg (OH) 2 .
  • the high differential pressure portion 7 may be provided in the scrubber 6. For example, immediately after the second contact liquid L2 is sprayed on the exhaust gas G3 after cooling, these mixed fluids pass through the high differential pressure portion 7 that causes a pressure loss. As a result, the mixed fluid becomes a turbulent state, and the exhaust gas G3 after cooling and the second contact liquid L2 are more sufficiently mixed, and the components in the exhaust gas G3 after cooling into the second contact liquid L2. Can be further promoted.
  • the second contact liquid L2 after coming into contact with the exhaust gas G3 after cooling is stored at the bottom of the scrubber 6 as the second recovered liquid S2.
  • a centrifugal dust collector 8 may be provided.
  • the clean gas G4 is discharged from the chimney 10 to the atmosphere after the mist-like water is removed by the centrifugal dust collector 8 to become the exhaust clean gas G5.
  • a fan 9 may be provided between the centrifugal dust collector 8 and the chimney 10, whereby the gas flow rate in the apparatus from the entrance of the second cooling tower 4 to the exit of the chimney 10 can be adjusted.
  • the mist-like water separated by the centrifugal dust collector 8 is stored as a third recovered liquid S3 at the bottom of the centrifugal dust collector 8.
  • the first recovered liquid S ⁇ b> 1 is extracted from the bottom of the second cooling tower 4 through the pipe 11 and collected in the recovered liquid tank 14.
  • the second recovered liquid S2 is extracted from the bottom of the scrubber 6 through the pipe 12 and collected in the recovered liquid tank 14.
  • the third recovered liquid S3 is extracted from the bottom of the centrifugal dust collector 8 through the pipe 13 and collected in the recovered liquid tank 14.
  • any one of the first recovered liquid S1, the second recovered liquid S2, and the third recovered liquid S3 may be recovered in the recovered liquid tank 14, but all the recovered liquids S1 to S3 are stored. By collecting, the recovery rate of the glass component from the exhaust gas can be increased. Further, it is preferable that the recovered liquid tank 14 recovers the recovered liquid after being treated with water and Mg (OH) 2 . That is, it is preferable that the first contact liquid L1 and the second contact liquid L2 are liquids that contain water and Mg (OH) 2 .
  • the second cooling tower 4 is provided together with the first cooling tower 2, but the second cooling tower can be omitted by sufficiently cooling the exhaust gas by the first cooling tower.
  • the exhaust gas may be brought into contact with water and Mg (OH) 2 in the scrubber 6.
  • the recovered liquid is used as a cooling liquid in the process of cooling the exhaust gas.
  • the recovered liquid tank 14 from which the recovered liquid is recovered includes a pH measurement device 15 and an Mg (OH) 2 addition device 16.
  • the first to third recovered liquids S1 to S3 are mixed in the recovered liquid tank 14 to become a recovered liquid mixture.
  • this recovered liquid mixture at least a boron component in the exhaust gas G0 is dissolved.
  • Mg (OH) 2 is added to the recovered liquid mixture. Thereby, the liquid containing a boron component and a magnesium component is obtained.
  • Mg (OH) 2 causes the boron component in the recovered liquid mixture to react with Mg (OH) 2 to produce magnesium borate.
  • the liquid obtained by adding Mg (OH) 2 contains the produced magnesium borate and, optionally, an unreacted boron component and Mg (OH) 2 . This liquid is called a liquid containing a boron component and a magnesium component.
  • the liquid containing the boron component and the magnesium component is preferably an aqueous solution in which these components are dissolved.
  • components in the liquid such as magnesium borate are not sufficiently dissolved due to changes in the concentration, liquid temperature, liquid pH, etc., and the addition of Mg (OH) 2 to the recovered liquid mixture may cause some cloudiness. is there.
  • the liquid in a state in which the cloudiness is generated can be used as various liquids for the first cooling tower 2, the second cooling tower 4, and the scrubber 6.
  • the liquid obtained by adding Mg (OH) 2 may contain a trace amount of chlorine, fluorine, calcium, and the like.
  • Mg (OH) 2 is hardly soluble in water
  • a slurry in which Mg (OH) 2 is dispersed in water hereinafter referred to as a water slurry of Mg (OH) 2 is referred to. It is preferred to prepare and add this to the recovered liquid mixture.
  • the Mg (OH) of Mg (OH) 2 in 2 water slurry concentration may be constant or may be changed according to the water level in the collection liquid tank 14.
  • a stirring means such as a bubbler is provided in the recovery liquid tank 14 in order to prevent generation of precipitates or white turbidity due to unreacted Mg (OH) 2. It is preferable to provide and stir this liquid.
  • the amount of Mg (OH) 2 added to the recovered liquid mixture is preferably sufficient to convert a boron component such as boric acid in the recovered liquid mixture into a magnesium salt.
  • the amount is preferably sufficient to convert these components and the boron component into a magnesium salt.
  • the pH of the liquid in the recovered liquid tank 14 is measured by the pH measuring device 15, and the supply amount of the aqueous slurry of Mg (OH) 2 is maintained so that this pH is maintained within the range of 6.5 to 7.7. Is preferably controlled.
  • the pH of this liquid is 6.5 or more, the boron component and the like in the recovered liquid mixture can be favorably converted into a magnesium salt, and the unreacted boron component and the like remaining in the liquid can be reduced.
  • the pH of the liquid is preferably maintained at 7.7 or less, more preferably 7.5 or less, 7.0 or less is particularly preferable.
  • the liquid thus obtained is supplied from the recovery liquid tank 14 to the first cooling tower 2 and reused as a cooling liquid.
  • a part of this liquid may be reused as the first contact liquid L1 and the second contact liquid L2. That is, a part of the liquid in the recovered liquid tank 14 passes through the circulation pump 17 and is temperature-adjusted as necessary, and then sprayed into the second cooling tower 4 and the scrubber 6. It can be used as the second contact liquid L2 sprayed on.
  • the recovered powder has an average particle size (D50) of 30 to 100 ⁇ m.
  • the recovered powder can be used as a glass raw material for producing an alkali-free borosilicate glass.
  • the recovered powder can be reused as a glass raw material after being recovered from the bag filter 3 and put into the glass melting furnace 1 on the same line.
  • the recovered powder may be taken out from the bag filter 3 for use in another glass production line after being recovered.
  • This recovered powder has a melting point of 100 ° C. or higher than soda lime glass containing an alkali component, and is added to the glass raw material when the alkali-free glass raw material that is hardly soluble is melted in the glass melting furnace 1. Suitable for By adding this recovered powder to the alkali-free glass raw material, the solubility can be improved and the clarity can be improved. Thereby, high productivity and high quality alkali-free glass can be obtained.
  • the recovered powder may contain boron components, sulfur components, chlorine components, fluorine components, etc. contained in the exhaust gas G0 as components recovered by the bag filter 3. Further, the recovered powder may contain a calcium component added from the Ca compound supply device 18. Further, the recovered powder may include a magnesium component, a boron component, a sulfur component, a chlorine component, and the like as components added to the first cooling tower 2 from the recovered liquid tank 14.
  • the recovered powder preferably has a MgO / (CaO + MgO) ratio of 0.1 to 1.0, more preferably 0.1 to 0.8, and still more preferably 0.1 by mass ratio based on oxide. ⁇ 0.4. This can provide a composition that can be easily reused as a glass raw material.
  • the fluorine component When the fluorine component is contained in the exhaust gas G0 as a clarifier component, the fluorine component is adsorbed on the calcium component by the bag filter 3 and can be recovered together as a recovered powder.
  • the fluorine component is preferably 0.1 to 2.0% by mass, more preferably 0.3 to 1.0% by mass, based on the oxide, with respect to the entire powder.
  • the composition containing a fluorine as a clarifier can be provided.
  • the fluorine component contained in the recovered powder include calcium fluoride and magnesium fluoride.
  • sulfur components may be mixed into the exhaust gas G0.
  • sulfur components may be circulated and concentrated in the exhaust gas treatment system.
  • the blending amount may be adjusted in consideration of the increase in the sulfur component.
  • the volume concentration of the sulfur oxide gas in the exhaust gas G0 collected from the glass melting furnace 1 is 500 vol. It is preferable to melt the glass raw material so as to be equal to or lower than ppm, and more preferably 50 vol. More preferably, it is not more than ppm, and further substantially does not contain sulfur oxide gas. Examples of such a melting method include gas combustion and electric heating.
  • examples of the sulfur oxide gas in the exhaust gas G0 include SO 3 and SO 2 .
  • the lower limit of the average particle diameter (D50) of the recovered powder may be 30 ⁇ m or more, more preferably 35 ⁇ m or more, and further preferably 40 ⁇ m or more.
  • the upper limit value may be 100 ⁇ m or less, more preferably 80 ⁇ m or less, and still more preferably 60 ⁇ m or less.
  • the average particle size (D50) is preferably 100 ⁇ m or less from the viewpoint of easily suppressing the generation of bubbles in the molten glass.
  • the volume-based 90% cumulative particle size (D90) of the recovered powder is preferably 200 ⁇ m or less, more preferably 150 ⁇ m or less, still more preferably 100 ⁇ m or less, and even more preferably 80 ⁇ m or less.
  • the above average particle diameter (D50) and volume-based 90% cumulative particle diameter (D90) can be adjusted by the type, thickness, air permeability, etc. of the bag cloth of the bag filter 3.
  • the average particle diameter (D50) is a median diameter of 50% cumulative volume in a particle size distribution curve measured using a laser diffraction scattering method when the particles are less than 1 mm.
  • the volume-based 90% cumulative particle diameter (D90) is a particle diameter of 90% cumulative volume in a particle size distribution curve measured using a laser diffraction scattering method when the particles are less than 1 mm.
  • the recovered powder recovered by the present embodiment may be provided as a granulated body.
  • a manufacturing method of a granulated body it can granulate by mixing powder and arbitrary liquids and using a well-known granulation method suitably.
  • a dry granulation method such as rolling granulation or a wet granulation method such as spray drying is preferably used.
  • the glass raw material recovery rate from the exhaust gas can be increased.
  • an alkaline earth metal borate hydrate can be generated in the granulated body.
  • the strength of the granulated body can be improved.
  • the alkaline earth metal Ca and / or Sr are preferable.
  • Ca is a component added in the powder recovery process, and thus is included in the recovered powder. By adding this Ca component in the form of dolomite ((Ca, Mg) CO 3 ), calcium borate hydrate can be more easily generated.
  • the strength of the granulated body can be improved when the granulated body is formed. Since Mg is a component added in the second cooling tower 4 and the scrubber 6, it is contained in the recovered powder.
  • the final product of glass is a product in which glass that is solid at room temperature and has substantially no fluidity is used for part or all of the glass, and the glass surface is processed. .
  • FIG. 3 is a flowchart showing an example of the glass manufacturing method of the present embodiment.
  • Reference numeral 101 denotes a glass melting step, which corresponds to the glass melting step described above.
  • the molten glass obtained in the glass melting step 101 is formed into a target shape in the forming step 102 and then slowly cooled in a slow cooling step 103 by a known method. Thereafter, the glass is obtained by performing post-processing by a known method such as cutting or polishing in the post-processing step 104 as necessary.
  • the forming step 102 can be performed by a known method such as a float method, a down draw method, or a fusion method.
  • the float process is a method of forming molten glass into a plate shape on molten tin.
  • the molten glass is preferably formed into a plate shape by a float method or the like.

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Abstract

L'invention concerne un procédé de fabrication de verre sans alcali qui comporte : une étape au cours de laquelle une matière première de verre est mise en fusion, et un gaz d'échappement est recueilli ; une étape au cours de laquelle un liquide de refroidissement est mis en contact avec le gaz d'échappement, et ce dernier est refroidi ; une étape au cours de laquelle au moins un élément choisi dans un groupe constitué de CaCO3, Ca(OH)2 et (Ca, Mg) CO3, est ajouté au gaz d'échappement refroidi ; une étape au cours de laquelle une poudre de diamètre de grain moyen (D50) compris entre 30 et 100µm, est récupérée dans le gaz d'échappement à l'aide d'un élément de collecte ; et une étape au cours de laquelle un composant contenu dans le gaz d'échappement est récupéré en tant que liquide de récupération par mise en contact d'un Mg(OH)2 et d'une eau avec le gaz d'échappement dont la poudre a été récupérée. Le liquide de récupération est mis en œuvre en tant que liquide de refroidissement dans l'étape au cours de laquelle le gaz d'échappement est refroidi.
PCT/JP2013/079170 2012-11-15 2013-10-28 Procédé de fabrication de verre sans alcali WO2014077114A1 (fr)

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JP2014546925A JP6075383B2 (ja) 2012-11-15 2013-10-28 無アルカリガラスの製造方法
CN201380059794.2A CN104797537B (zh) 2012-11-15 2013-10-28 无碱玻璃的制造方法

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JP2016117628A (ja) * 2014-12-24 2016-06-30 日本電気硝子株式会社 ガラス繊維の製造方法
WO2017179364A1 (fr) * 2016-04-15 2017-10-19 日本電気硝子株式会社 Procédé de fabrication d'un produit en verre
US20180265399A1 (en) * 2016-05-03 2018-09-20 Lg Chem, Ltd. Borosilicate glass, light guide plate comprising the same and fabricating methods thereof

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WO2017191913A1 (fr) * 2016-05-03 2017-11-09 주식회사 엘지화학 Verre borosilicaté, plaque de guidage de lumière comprenant celui-ci et procédé de fabrication de ladite plaque de guidage de lumière
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WO2017179364A1 (fr) * 2016-04-15 2017-10-19 日本電気硝子株式会社 Procédé de fabrication d'un produit en verre
US20180265399A1 (en) * 2016-05-03 2018-09-20 Lg Chem, Ltd. Borosilicate glass, light guide plate comprising the same and fabricating methods thereof
US10662107B2 (en) * 2016-05-03 2020-05-26 Lg Chem, Ltd. Borosilicate glass, light guide plate comprising the same and fabricating methods thereof

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CN104797537B (zh) 2017-03-08
KR102086435B1 (ko) 2020-03-09
CN104797537A (zh) 2015-07-22

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