CN105384325A - A fusion method and a manufacturing method for an alkali-free glass pane - Google Patents

A fusion method and a manufacturing method for an alkali-free glass pane Download PDF

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Publication number
CN105384325A
CN105384325A CN201510557577.7A CN201510557577A CN105384325A CN 105384325 A CN105384325 A CN 105384325A CN 201510557577 A CN201510557577 A CN 201510557577A CN 105384325 A CN105384325 A CN 105384325A
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room
burner
glass
alkali
chamber
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CN105384325B (en
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广濑元之
栉谷英树
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AGC Inc
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Asahi Glass Co Ltd
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P40/00Technologies relating to the processing of minerals
    • Y02P40/50Glass production, e.g. reusing waste heat during processing or shaping

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  • Chemical & Material Sciences (AREA)
  • Glass Compositions (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Glass Melting And Manufacturing (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
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Abstract

Provided is a fusion method and a manufacturing method for an alkali-free glass pane. According to the fusion method, raw materials of glass are fused in a melting furnace. The melting furnace comprises a first chamber, in which the raw materials are input, a first chamber combustor, a second chamber receiving melted glass formed by fusing the above raw materials supplied by the first chamber, a second combustor and a throat portion connecting the lower portion of the first chamber and the lower portion of the second chamber. The raw materials are raw material of alkali-free glass with 54-73 mass % of SiO[2] and 0.1-12 mass % of B[2]O[3]. The above first chamber combustor and the second chamber combustor use an oxy-fuel combustion combustor or an air combustion combustor. 50-100% of the total burning calories per hour of the first chamber combustor are generated by the oxy-fuel combustion combustor. 75-100% of the total burning calories per hour of the second chamber combustor are generated by the air combustion combustor.

Description

The manufacture method of melting method and non-alkali glass plate
Technical field
The present invention relates to the manufacture method of melting method and non-alkali glass plate.
Background technology
Fusing kiln is the equipment of the raw materials melt making non-alkali glass.Fusing kiln furnitures are standby: the first Room that raw material is put into, upper space in the first Room formed flame the first Room burner, receive from the first Room supply by the melten glass of raw materials melt the second Room, forms the second Room burner of flame and the throat of the connection bottom of the first Room and the bottom of the second Room at the upper space of the second Room.
First Room burner, the second Room burner are by also burning the fuel such as Sweet natural gas, heavy oil and gas and vapor permeation and form flame.Be called air-breathing burner using mainly using air as burning of gas device, will mainly use oxygen to be called oxygen-fired burners as burning of gas device.
When air-breathing burner, the most nitrogen of duty gas not to be discharged in contributive situation outside fusing kiln burning.On the other hand, when oxygen-fired burners, compared with the situation of air-breathing burner, free air delivery is less, and therefore thermo-efficiency is high, CO 2output and NO xoutput is few.
Also the burner (such as referenced patent document 1) utilized the mixed gas of air and oxygen mix can be used.In this case, naturally need not be than with the situation of oxygen-fired burners, even if compared with the situation of air-breathing burner, NO sometimes xoutput also can increase (such as with reference to non-patent literature 1).Specifically, when the oxygen concn in mixed gas is lower than 93 volume % and more than 25 volume %, compared with the situation of air-breathing burner, NO xoutput increases.
Prior art document
Patent documentation
Patent documentation 1: Japanese Unexamined Patent Publication 2000-128549 publication
Non-patent literature
Non-patent literature 1:R & D god Kobe steel skill report, the 51st volume, the 2nd phase (September calendar year 2001), 8th ~ 12 pages, " the low NO of sour plain enrichment empty mood To I Ru province エ ネ Le ギ と xthe research of combustion Ware に Seki The Ru is (about utilizing the energy-conservation of oxygen-rich air and low NO xthe research of burning) "
Summary of the invention
Invent problem to be solved
When non-alkali glass, compared with the situation of general soda-lime glass, the temperature of fusion of raw material is high, easily on the liquid level of the melten glass of the first indoor, is coated with bubble layer.Bubble layer is the aggregate of small bubbles, and bubble is that the gas generation caused because of the thermolysis of raw material etc. is caused.Bubble layer is particularly at the SiO of non-alkali glass 2content is easily formed when being 54 ~ 73 quality %.
When having bubble layer, molten glass surface becomes the atmosphere being difficult to directly be exposed to upper space.Therefore, the thermal radiation of flame to melten glass from burner is blocked, and the heating efficiency of melten glass is low.
When the general glass containing alkali composition, the alkali content in melten glass is more, then the B in melten glass 2o 3more easily volatilize.B 2o 3such as volatilize in the mode of sodium compound.
On the other hand, when containing the non-alkali glass of the alkali compositions such as Na hardly in melten glass, the moisture concentration in the atmosphere of upper space is higher, then the B in melten glass 2o 3more easily volatilize.
Amount of moisture in the atmosphere of upper space depends on the kind of burner.When oxygen-fired burners, compared with the situation of air-breathing burner, moisture concentration contained in the gas after burning is high, the B in melten glass 2o 3easy volatilization.B 2o 3be considered to volatilize in the mode of hydrogen compound.
The present invention completes in view of the above problems, its main purpose be to provide can across bubble layer heating and melting glass and B in melten glass can be suppressed effectively 2o 3the melting method etc. of volatilization.
For the means of dealing with problems
In order to solve the problem, according to a mode of the present invention,
There is provided a kind of melting method, it makes the melting in fusing kiln of the raw material of glass, and described fusing kiln furnitures are standby:
The first Room that above-mentioned raw materials is put into,
Upper space in above-mentioned first Room formed flame the first Room burner,
Receive from above-mentioned first Room supply by the melten glass of above-mentioned raw materials melting the second Room,
Upper space in above-mentioned second Room formed flame the second Room burner and
Connect the throat of the bottom of above-mentioned first Room and the bottom of above-mentioned second Room, wherein
Described raw material is SiO 2content is 54 ~ 73 quality %, B 2o 3content is the raw material of the non-alkali glass of 0.1 ~ 12 quality %,
Each above-mentioned first Room burner and each above-mentioned second Room burner use any one in oxygen-fired burners and air-breathing burner,
All 50 ~ 100% being produced by above-mentioned oxygen-fired burners of horal gross heat of combustion amount of above-mentioned first Room burner,
All 75 ~ 100% being produced by above-mentioned air-breathing burner of horal gross heat of combustion amount of above-mentioned second Room burner.
Invention effect
According to a mode of the present invention, provide a kind of melting method, its can across bubble layer heating and melting glass and B in melten glass can be suppressed effectively 2o 3volatilization.
Accompanying drawing explanation
Fig. 1 is the schema of the manufacture method of the non-alkali glass plate illustrated based on one embodiment of the present invention.
Fig. 2 is the sectional view that the fusing kiln used in the melting process of Fig. 1 is shown.
Fig. 3 is the sectional view of the fusing kiln illustrated based on the first variation.
Fig. 4 is the sectional view of the fusing kiln illustrated based on the second variation.
Fig. 5 is the sectional view of the fusing kiln illustrated based on the 3rd variation.
Embodiment
Below, be described for implementing mode of the present invention with reference to accompanying drawing.In the drawings and in which, for identical or corresponding formation, mark identical or corresponding symbol and omit the description.In this manual, represent that " ~ " of numerical range refers to the scope of the numerical value comprised before and after it.
Fig. 1 is the schema of the manufacture method of the non-alkali glass plate illustrated based on one embodiment of the present invention.The manufacture method of non-alkali glass plate has melting process S12 and forming process S14.
Non-alkali glass is in fact not containing Na 2o, K 2o, Li 2the glass of the alkalimetal oxides such as O.In the non-alkali glass that the present invention relates to, the total amount of the content of alkalimetal oxide is below 0.2 quality %.
Non-alkali glass such as contains in the quality percentage based on oxide compound:
SiO 2:54~73%
Al 2O 3:10~23%
B 2O 3:0.1~12%
MgO:0~12%
CaO:0~15%
SrO:0~16%
BaO:0~15%
MgO+CaO+SrO+BaO:8~26%。
When obtaining high strain-point, the B of non-alkali glass 2o 3content is preferably below 9 quality %, is more preferably below 5 quality %, more preferably below 3 quality %, be particularly preferably below 2 quality %.
In addition, when obtaining high melting, the B of non-alkali glass 2o 3content is preferably more than 0.3 quality %, is more preferably more than 0.5 quality %, more preferably more than 1 quality %.
The strain point of non-alkali glass is preferably more than 650 DEG C, is more preferably more than 670 DEG C, more preferably more than 700 DEG C.
The T of non-alkali glass 2(as the temperature of the benchmark of fusing, being equivalent to viscosity is 10 2temperature during dPas) than the T of general soda-lime glass 2high more than 100 DEG C.The T of non-alkali glass 2be preferably 1600 ~ 1820 DEG C, be more preferably 1610 ~ 1770 DEG C, more preferably 1620 ~ 1720 DEG C.
β-the OH of the expression amount of moisture of non-alkali glass plate is preferably 0.2 ~ 0.4mm -1, be more preferably 0.2 ~ 0.35mm -1.The value of β-OH is higher, represents that amount of moisture is more.When melting under the atmosphere that moisture concentration is high, this value is high.The value B of β-OH calculates by measuring the thickness of slab C of non-alkali glass plate and transmissivity T and this measurement result being substituted into following formula.In the mensuration of the transmissivity of non-alkali glass plate, use common Fourier transformation infrared spectrometer (FT-IR).
B=(1/C)log 10(T1/T2)
T1: the transmissivity (unit: %) of the non-alkali glass plate under reference wave number 4000/cm
T2: the minimum transmittance (unit: %) of the non-alkali glass plate near hydroxyl group absorption wave number 3570/cm
Non-alkali glass plate can be used as the substrate of the indicating meters such as liquid-crystal display, the substrate etc. of disk.The purposes of non-alkali glass plate can be diversified.Although describe in detail afterwards, according to the present embodiment, can obtain that the shortcomings such as bubble are few, the non-alkali glass plate of homogeneous, therefore be particularly suitable for the substrate of the liquid-crystal display requiring high-quality.
In the melting process S12 shown in Fig. 1, the raw material of non-alkali glass is dropped in fusing kiln, raw materials melt is obtained melten glass.
In the forming process S14 shown in Fig. 1, melten glass is configured as tabular.Manufacturing process can be ordinary method, can enumerate such as float glass process, scorification etc.
Float glass process is supplied to continuously by melten glass on molten metal (such as molten tin), melten glass flowed in the horizontal direction on molten metal, is configured as band plate-like thus.
Scorification is also referred to as overflow downdraw, and the melten glass that overflows in the left and right sides from chute is flowed down along the left and right sides of chute, the melten glass behind interflow, the lower end of chute is in downward direction flowed further, is configured as band plate-like thus.
It should be noted that, clarifying plant (such as vacuum degassing apparatus), whipping appts (such as stirring agitator) can be provided with between melting process S12 and forming process S14.
Fig. 2 is the sectional view that the fusing kiln used in the melting process of Fig. 1 is shown.Fusing kiln furnitures have the first Room 21, first Room burner 26, second Room 31, second Room burner 36 and throat 41 etc.
First Room 21 is rooms that the raw material 12 of non-alkali glass is put into.First Room 21 by raw material 12 melting, and stores melten glass 14.First Room 21 is surrounded by the diapire 22 of level, the upstream sidewall 23 vertical relative to diapire 22, the downstream sidewall 24 parallel relative to upstream sidewall 23, top board 25 (such as arch top board) etc.As shown in Figure 2, downstream sidewall 24 reaches to top board 25, as long as but higher than bubble layer 16, also can not reach as shown in Figure 3 to top board 25.Upstream sidewall 23 place is formed with the input port 23a of raw material 12.
The fuel such as Sweet natural gas, heavy oil and gas and vapor permeation also burn and form flame by the first Room burner 26.The upper space of the first Room burner 26 in the first Room 21 forms flame, by the heating such as raw material 12 grade dropped into from input port 23a.Raw material 12 is waited by the flame radiation heat that the first Room burner 26 is formed and is melted, and fuses into lentamente in melten glass 14.
First Room burner 26 jets out flames from connecting the opening portion of upstream sidewall 23 with the left and right sides wall of downstream sidewall 24 to the first Room 21.First Room burner 26 can jet out flames continuously, also can jet out flames off and on.
First Room burner 26 arranges respectively at above-mentioned left and right sides wall.First Room burner 26 can clip the first Room 21 and configure in symmetrical mode, also can clip the first Room 21 interconnected, also can a part to configure in symmetrical mode and a part is interconnected.
Each first Room burner 26 uses any one in air-breathing burner, oxygen-fired burners.Among multiple first Room burner 26, can be all oxygen-fired burners, can a part be also oxygen-fired burners and all the other are air-breathing burner.
In this manual, air-breathing burner refers to that the main air that uses is as the burning of gas device with fuel mix, refers to that the oxygen concn of gas is the burner of 25 below volume %.If the oxygen concn of gas is 25 below volume %, the mixed gas of air and oxygen can be used, also only can use air.
In addition, in this manual, oxygen-fired burners refers to that the main oxygen that uses is as the burning of gas device with fuel mix, refers to that the oxygen concn of gas is the burner of 93 more than volume %.If the oxygen concn of gas is 93 more than volume %, the mixed gas of oxygen and air can be used, also only can use oxygen.
Each first Room burner 26 can use any one in air-breathing burner, oxygen-fired burners, therefore, it is possible to reduce NO xoutput.
Utilize the first Room burner 26 to carry out the object of heating and melting glass 14 for auxiliary, electrode melten glass 14 being carried out to electrified regulation can be provided with in the melten glass 14 of the first Room 21.
Preferably do not import the dry gas such as nitrogen at the upper space of the first Room 21.The reduction of thermo-efficiency, the increase of free air delivery can be prevented.
Second Room 31 receive supply from the first Room 21 by the melten glass 14 of raw material 12 melting.Melten glass 14 carries out clarifying or carrying out temperature adjustment by the second Room 31.Second Room 31 is surrounded by the diapire 32 of level, the upstream sidewall 33 vertical relative to diapire 32, the downstream sidewall 34, top board 35 etc. parallel relative to upstream sidewall 33.The conveying end 34a of melten glass 14 is formed in the bottom of downstream sidewall 34.
The diapire 32 of the second Room 31 and the diapire 22 of the first Room 21 as shown in Figure 2 integration form, but also can non-integral as shown in Figure 4.In addition, also jump D can be had as shown in Figure 4 between the diapire 32 of the second Room 31 and the diapire 22 of the first Room 21.It should be noted that, the diapire 32 of the second Room 31 and the diapire 22 of the first Room 21 which higher can.
The upstream sidewall 33 of the second Room 31 is integrated with the downstream sidewall 24 of the first Room 21 to be formed, but also can non-integral as shown in Figure 5.
The top board 35 of the second Room is integrated with the top board 25 of the first Room 21 to be formed, but also can be non-integral.As the situation of the top board 35 of the second Room and top board 25 non-integral of the first Room 21, the situation of the downstream sidewall 24 of such as the first Room 21 as shown in Figure 5 and upstream sidewall 33 non-integral of the second Room 31 can be enumerated.
The fuel such as Sweet natural gas, heavy oil and gas and vapor permeation also burn and form flame by the second Room burner 36.The upper space of the second Room burner 36 in the second Room 31 forms flame, is heated the melten glass 14 supplied by the first Room 21.
Second Room burner 36 jets out flames from connecting the opening portion of upstream sidewall 33 with the left and right sides wall of downstream sidewall 34 to the second Room 31.Second Room burner 36 can jet out flames continuously, also can jet out flames off and on.
The left and right sides wall that second Room burner 36 is connecting upstream sidewall 33 and downstream sidewall 34 arranges respectively.Second Room burner 36 can clip the second Room 31 and configure in symmetrical mode, also can clip the second Room 31 interconnected, can also a part to configure in symmetrical mode and a part is interconnected.
Each second Room burner 36 can use any one in air-breathing burner, oxygen-fired burners.Among multiple second Room burner 36, can be all air-breathing burner, can a part be also air-breathing burner and all the other are oxygen-fired burners.
Each second Room burner 36 can use any one in air-breathing burner, oxygen-fired burners, therefore, it is possible to reduce NO xoutput.
Utilize the second Room burner 36 to carry out the object of heating and melting glass 14 for auxiliary, electrode melten glass 14 being carried out to electrified regulation can be provided with in the melten glass 14 of the second Room 31.
Preferably do not import the dry gas such as nitrogen at the upper space of the second Room 31.The reduction of thermo-efficiency, the increase of free air delivery can be prevented.
Throat 41 connects the bottom of the first Room 21 and the bottom of the second Room 31.Throat 41 is melted glass 14 and fills up.Throat 41 can be provided with multiple.The melten glass 14 of the first Room 21 is supplied to the second Room 31 via throat 41.
The entrance of throat 41 is formed at downstream sidewall 24 place of the first Room 21 in fig. 2, but also can be formed at diapire 22 place of the first Room 21.Similarly, the outlet of throat 41 is formed at upstream sidewall 33 place of the second Room 31 in fig. 2, but also can be formed at diapire 32 place of the second Room 31.
The T of non-alkali glass 2than the T of general soda-lime glass 2high more than 100 DEG C.Therefore, in the present embodiment, the first Room burner 26 and the second Room burner 36 both sides are used to carry out heating and melting glass 14.
When non-alkali glass, compared with the situation of general soda-lime glass, the temperature of fusion of raw material 12 is high, coating gas alveolar layer 16 on the liquid level of the melten glass 14 easily in the first Room 21.Bubble layer 16 is aggregates of small bubbles, and bubble is that the gas generation caused because of the thermolysis of raw material 12 etc. is caused.Bubble layer 16 is particularly at the SiO of non-alkali glass 2content is easily formed when being 54 ~ 73 quality %.Bubble layer 16 blocks flame from the first Room burner 26 to the thermal radiation of melten glass 14.
Therefore, in the present embodiment, 50 ~ 100% of the horal gross heat of combustion amount of whole first Room burner 26 (are preferably 55 ~ 100%, are more preferably 60 ~ 100%) are made to be produced by oxygen-fired burners.
When air-breathing burner, the most nitrogen of duty gas not to be discharged in contributive situation outside fusing kiln burning.On the other hand, when oxygen-fired burners, compared with the situation of air-breathing burner, free air delivery is less, and therefore thermo-efficiency is high, CO 2output and NO xoutput is few.
When 50 ~ 100% of the horal gross heat of combustion amount of whole first Room burner 26 is produced by oxygen-fired burners, though across bubble layer 16 also can effectively heating and melting glass 14, with less fuel, melten glass 14 can be heated to desired temperature.Gross heat of combustion amount is by carrying out total to try to achieve by the heat produced when the complete combustion of fuel used in each burner.
Melten glass 14 in the first Room 21 after melting is supplied to the second Room 31.Owing to supplying melten glass 14 by throat 41 to the second Room 31, therefore the melten glass 14 of homogeneous is supplied to the second Room 31 when the bubble layer 16 being subject to the first Room 21 hardly affects, therefore, in the second Room 31, different from the first Room 21, form bubble layer 16 hardly.
In the second Room 31, the liquid level of melten glass 14 exposes, and melten glass 14 is exposed in the atmosphere of the upper space of the second Room 31.Gas in the atmosphere of the upper space of the second Room 31 dissolves in melten glass 14.
When general alkali-containing glass, the alkali content in melten glass is more, then the B in melten glass 2o 3more easily volatilize.B 2o 3such as volatilize in the mode of sodium compound.
On the other hand, when containing the non-alkali glass of the alkali compositions such as Na hardly in melten glass, the moisture concentration in the atmosphere of upper space is higher, then the B in melten glass 2o 3more easily volatilize.
Amount of moisture in the atmosphere of upper space depends on the kind of burner.When oxygen-fired burners, compared with the situation of air-breathing burner, moisture concentration contained in the gas after burning is high, the B in melten glass 2o 3easy volatilization.
Therefore, in the present embodiment, 75 ~ 100% of the horal gross heat of combustion amount of whole second Room burner 36 (are preferably 80 ~ 100%, are more preferably 85 ~ 100%, more preferably 90 ~ 100%) are made to be produced by air-breathing burner.
When 75 ~ 100% of the horal gross heat of combustion amount of whole second Room burner 36 is produced by air-breathing burner, compared with the moisture concentration of the upper space of the first Room 21, the moisture concentration of the upper space of the second Room 31 is low.Therefore, it is possible to the B in suppression melten glass 2o 3volatilization.
Distance L1 on the upstream extremity of the first Room 21 and the flow direction (in Fig. 2 left and right directions) of downstream end be preferably reference range L0 50 ~ 75%, be more preferably 55 ~ 70% of reference range L0.In addition, the distance L2 on the upstream extremity of the second Room 31 and the flow direction (in Fig. 2 left and right directions) of downstream end be preferably reference range L0 10 ~ 40%, be more preferably 15 ~ 35% of reference range L0.Reference range L0 is the distance on the flow direction of the upstream extremity of the first Room 21 and the downstream end of the second Room 31.
When distance L1 is 50 ~ 75% of reference range L0 and distance L2 is 10 ~ 40% of reference range L0, can balancedly heating and melting glass 14 in the first Room 21 and the second Room 31.
In an embodiment of the invention, be set as: in the first Room burner 26, the distance apart from the upstream extremity of the first Room 21 is that more than 60% (be preferably more than 65%, be more preferably more than 70%, more preferably more than 80%) of the horal gross heat of combustion amount of the first Room burner 26 arranged in the region of more than 0.5L1 is produced by oxygen-fired burners.
When the first Room burner 26 arranged in aforementioned region horal gross heat of combustion amount more than 60% produced by oxygen-fired burners time, then free air delivery tails off, therefore, it is possible to effectively heated by melten glass 14, and non-alkali glass plate can be manufactured with few gas usage quantity.
Above, fusing kiln, melting method, the manufacture method of non-alkali glass plate, the embodiment of non-alkali glass are illustrated, but the present invention is not limited to above-mentioned embodiment, various distortion and replacement can be applied to above-mentioned embodiment without departing from the present invention.
Such as, the fusing kiln furnitures of above-mentioned embodiment have the first Room 21 and the second Room 31, but also can have the 3rd Room receiving the melten glass 14 supplied from the second Room 31 further.The quantity of the room of fusing kiln can be more than 4.In addition, in order to promote fusing, the uniformity of glass, the diapire of the first Room 21 and/or the second Room 31 can be provided with such as bubbler etc.
Nomenclature
The raw material of 12 non-alkali glasss
14 melten glass
16 bubble layers
Room 21 first
The diapire of Room 22 first
The upstream sidewall of Room 23 first
The input port of 23a raw material
The downstream sidewall of Room 24 first
The top board of Room 25 first
26 first Room burners
Room 31 second
The diapire of Room 32 second
The upstream sidewall of Room 33 second
The downstream sidewall of Room 34 second
The top board of Room 35 second
36 second Room burners
41 throats

Claims (3)

1. a melting method, it makes the melting in fusing kiln of the raw material of glass, and described fusing kiln furnitures are standby:
The first Room that described raw material is put into,
Upper space in described first Room formed flame the first Room burner,
Receive from described first Room supply by the melten glass of described raw materials melt the second Room,
Upper space in described second Room formed flame the second Room burner and
Connect the throat of the bottom of described first Room and the bottom of described second Room, wherein
Described raw material is SiO 2content is 54 ~ 73 quality %, B 2o 3content is the raw material of the non-alkali glass of 0.1 ~ 12 quality %,
Each described first Room burner and each described second Room burner use any one in oxygen-fired burners and air-breathing burner,
All 50 ~ 100% being produced by described oxygen-fired burners of horal gross heat of combustion amount of described first Room burner,
All 75 ~ 100% being produced by described air-breathing burner of horal gross heat of combustion amount of described second Room burner.
2. melting method as claimed in claim 1, wherein, described non-alkali glass contains in the quality % based on oxide compound:
SiO 2:54~73%
Al 2O 3:10~23%
B 2O 3:0.1~12%
MgO:0~12%
CaO:0~15%
SrO:0~16%
BaO:0~15%
MgO+CaO+SrO+BaO:8~26%。
3. a manufacture method for non-alkali glass plate, has:
Comprise the melting process of the melting method described in claim 1 or 2; With
Melten glass after melting in described melting process is configured as the forming process of tabular.
CN201510557577.7A 2014-09-03 2015-09-02 Melting method and method for producing alkali-free glass plate Active CN105384325B (en)

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