CN113072303A - Shape changing method of glass powder for solar cell conductive silver paste - Google Patents
Shape changing method of glass powder for solar cell conductive silver paste Download PDFInfo
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- CN113072303A CN113072303A CN202110329815.4A CN202110329815A CN113072303A CN 113072303 A CN113072303 A CN 113072303A CN 202110329815 A CN202110329815 A CN 202110329815A CN 113072303 A CN113072303 A CN 113072303A
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- 239000011521 glass Substances 0.000 title claims abstract description 150
- 239000000843 powder Substances 0.000 title claims abstract description 97
- 238000000034 method Methods 0.000 title claims abstract description 44
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 title claims abstract description 22
- 239000002245 particle Substances 0.000 claims abstract description 35
- 238000002844 melting Methods 0.000 claims abstract description 11
- 230000008018 melting Effects 0.000 claims abstract description 11
- 238000002156 mixing Methods 0.000 claims abstract description 11
- 239000000463 material Substances 0.000 claims description 29
- 239000000428 dust Substances 0.000 claims description 21
- 239000010419 fine particle Substances 0.000 claims description 18
- 239000000203 mixture Substances 0.000 claims description 18
- 238000010791 quenching Methods 0.000 claims description 16
- 230000000171 quenching effect Effects 0.000 claims description 16
- 239000007787 solid Substances 0.000 claims description 15
- 230000005514 two-phase flow Effects 0.000 claims description 14
- 239000002994 raw material Substances 0.000 claims description 11
- 238000000926 separation method Methods 0.000 claims description 11
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 10
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 10
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 10
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims description 10
- ADCOVFLJGNWWNZ-UHFFFAOYSA-N antimony trioxide Chemical compound O=[Sb]O[Sb]=O ADCOVFLJGNWWNZ-UHFFFAOYSA-N 0.000 claims description 10
- 238000001816 cooling Methods 0.000 claims description 10
- NUJOXMJBOLGQSY-UHFFFAOYSA-N manganese dioxide Chemical compound O=[Mn]=O NUJOXMJBOLGQSY-UHFFFAOYSA-N 0.000 claims description 10
- JKQOBWVOAYFWKG-UHFFFAOYSA-N molybdenum trioxide Chemical compound O=[Mo](=O)=O JKQOBWVOAYFWKG-UHFFFAOYSA-N 0.000 claims description 10
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical compound [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 claims description 10
- 238000010902 jet-milling Methods 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 7
- 230000009471 action Effects 0.000 claims description 6
- 238000005243 fluidization Methods 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 6
- 239000006060 molten glass Substances 0.000 claims description 6
- 230000001105 regulatory effect Effects 0.000 claims description 6
- QPLDLSVMHZLSFG-UHFFFAOYSA-N Copper oxide Chemical compound [Cu]=O QPLDLSVMHZLSFG-UHFFFAOYSA-N 0.000 claims description 5
- 239000005751 Copper oxide Substances 0.000 claims description 5
- MCMNRKCIXSYSNV-UHFFFAOYSA-N ZrO2 Inorganic materials O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims description 5
- 230000001133 acceleration Effects 0.000 claims description 5
- LFVGISIMTYGQHF-UHFFFAOYSA-N ammonium dihydrogen phosphate Chemical compound [NH4+].OP(O)([O-])=O LFVGISIMTYGQHF-UHFFFAOYSA-N 0.000 claims description 5
- 229910000387 ammonium dihydrogen phosphate Inorganic materials 0.000 claims description 5
- AYJRCSIUFZENHW-DEQYMQKBSA-L barium(2+);oxomethanediolate Chemical compound [Ba+2].[O-][14C]([O-])=O AYJRCSIUFZENHW-DEQYMQKBSA-L 0.000 claims description 5
- WMWLMWRWZQELOS-UHFFFAOYSA-N bismuth(III) oxide Inorganic materials O=[Bi]O[Bi]=O WMWLMWRWZQELOS-UHFFFAOYSA-N 0.000 claims description 5
- 229910021538 borax Inorganic materials 0.000 claims description 5
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims description 5
- 239000000292 calcium oxide Substances 0.000 claims description 5
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 5
- 239000000919 ceramic Substances 0.000 claims description 5
- 230000001276 controlling effect Effects 0.000 claims description 5
- 239000000498 cooling water Substances 0.000 claims description 5
- 229910000431 copper oxide Inorganic materials 0.000 claims description 5
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 5
- 229910000464 lead oxide Inorganic materials 0.000 claims description 5
- XGZVUEUWXADBQD-UHFFFAOYSA-L lithium carbonate Chemical compound [Li+].[Li+].[O-]C([O-])=O XGZVUEUWXADBQD-UHFFFAOYSA-L 0.000 claims description 5
- 229910052808 lithium carbonate Inorganic materials 0.000 claims description 5
- 239000000395 magnesium oxide Substances 0.000 claims description 5
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 5
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims description 5
- 235000019837 monoammonium phosphate Nutrition 0.000 claims description 5
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 5
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 claims description 5
- YEXPOXQUZXUXJW-UHFFFAOYSA-N oxolead Chemical compound [Pb]=O YEXPOXQUZXUXJW-UHFFFAOYSA-N 0.000 claims description 5
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 claims description 5
- 229910000027 potassium carbonate Inorganic materials 0.000 claims description 5
- 238000003825 pressing Methods 0.000 claims description 5
- 238000010079 rubber tapping Methods 0.000 claims description 5
- 239000000377 silicon dioxide Substances 0.000 claims description 5
- 235000012239 silicon dioxide Nutrition 0.000 claims description 5
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 5
- 235000017550 sodium carbonate Nutrition 0.000 claims description 5
- 239000004328 sodium tetraborate Substances 0.000 claims description 5
- 235000010339 sodium tetraborate Nutrition 0.000 claims description 5
- 238000003756 stirring Methods 0.000 claims description 5
- LAJZODKXOMJMPK-UHFFFAOYSA-N tellurium dioxide Chemical compound O=[Te]=O LAJZODKXOMJMPK-UHFFFAOYSA-N 0.000 claims description 5
- 239000004408 titanium dioxide Substances 0.000 claims description 5
- 239000011787 zinc oxide Substances 0.000 claims description 5
- 238000000227 grinding Methods 0.000 claims description 2
- 238000003860 storage Methods 0.000 claims 1
- 230000000694 effects Effects 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 5
- 230000008859 change Effects 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000002349 favourable effect Effects 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 238000012432 intermediate storage Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 235000014692 zinc oxide Nutrition 0.000 description 3
- 238000001914 filtration Methods 0.000 description 2
- 238000001878 scanning electron micrograph Methods 0.000 description 2
- 206010024796 Logorrhoea Diseases 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910021419 crystalline silicon Inorganic materials 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000012776 electronic material Substances 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
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- 238000004519 manufacturing process Methods 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
Images
Classifications
-
- 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
- C03C12/00—Powdered glass; Bead compositions
-
- 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
- C03C1/00—Ingredients generally applicable to manufacture of glasses, glazes, or vitreous enamels
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
- H01B1/14—Conductive material dispersed in non-conductive inorganic material
- H01B1/16—Conductive material dispersed in non-conductive inorganic material the conductive material comprising metals or alloys
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
- H01B1/20—Conductive material dispersed in non-conductive organic material
- H01B1/22—Conductive material dispersed in non-conductive organic material the conductive material comprising metals or alloys
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/02—Details
- H01L31/0224—Electrodes
- H01L31/022408—Electrodes for devices characterised by at least one potential jump barrier or surface barrier
- H01L31/022425—Electrodes for devices characterised by at least one potential jump barrier or surface barrier for solar cells
-
- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
Abstract
The application relates to the field of glass powder, and particularly discloses a method for changing the appearance of glass powder for conductive silver paste of a solar cell. The method for changing the appearance of the glass powder for the solar cell conductive silver paste comprises the following steps: (1) mixing; (2) melting; (3) tabletting; (4) crushing; (5) fluidizing the particles; (6) spheroidizing; (7) and (5) grading. According to the method, the fine glass particles are fluidized and spheroidized, so that the spherical glass powder which is fine and uniform and has a more regular shape can be obtained.
Description
Technical Field
The application relates to the field of glass powder, in particular to a method for changing the appearance of glass powder for solar cell conductive silver paste.
Background
The conductive silver paste is used as an electronic material, is widely applied in the field of conductivity, is a key auxiliary material of a crystalline silicon solar cell, and generally consists of silver powder, glass powder, an organic carrier and an additive.
In the aspect of improving the photoelectric conversion efficiency, various technical improvements and upgrades are made on conductive silver paste in the industry, and a plurality of technical improvements are also made on glass powder, but the efficiency improvement range is limited, so that the appearance of the glass powder is always an irregular polygon and is not changed.
The shape of the glass powder has great influence on the selection of the carrier, the viscosity of the slurry, the printability and the effect of the glass powder, and the conversion efficiency of the solar cell is directly influenced, so the shape of the glass powder still needs to be improved.
Disclosure of Invention
In order to improve the conversion efficiency of the solar cell, the application provides a method for changing the appearance of glass powder for conductive silver paste of the solar cell.
The application provides a method for changing the morphology of glass powder for conductive silver paste of a solar cell, which adopts the following technical scheme:
a method for changing the appearance of glass powder for conductive silver paste of a solar cell specifically comprises the following steps:
(1) mixing: stirring and mixing the raw materials of the glass powder uniformly to prepare a mixture;
(2) melting: heating and melting the mixture obtained in the step (1) until the mixture is clarified to form molten glass;
(3) tabletting: pouring the glass liquid obtained in the step (2) between two rollers of a tablet press, and rapidly cooling and pressing to form a glass sheet;
(4) crushing: slightly tapping the glass sheet to crack the glass sheet, and performing jet milling to obtain glass fine particles with the particle size of 10-80 um;
(5) particle fluidization: feeding the glass fine particles obtained in the step (4) into a crushing chamber, on a fluidized bed at room temperature, enabling compressed air to pass through a supersonic jet flow generated by the violent expansion and acceleration of a plurality of ceramic crushing nozzles arranged around a grinding cavity to form a centripetal counter-jet flow at the lower part of the crushing chamber, and fluidizing the ground material under the action of pressure difference to obtain glass fine powder;
(6) spheroidizing: the glass fine powder in the step (5) enters a turbine classifier, negative pressure airflow generated by the turbine classifier is brought into a high-temperature spheroidizing chamber for spheroidizing, and quenching is carried out after spheroidizing to obtain gas-solid two-phase flow;
(7) grading: the gas-solid two-phase flow enters a cyclone separator, and the glass fine powder meeting the requirements is collected at a discharge port to obtain glass powder; and (4) collecting the unqualified fine glass powder in a bag type dust collector, and separating again.
By adopting the technical scheme, the glass fine particles form a plurality of streams of material flows through the supersonic jet flow generated by the nozzles, the streams of material flows collide with each other along the tangential position and are converged at the intersection point of the nozzles to generate violent impact, collision and friction, so that the glass fine particles are sheared, rubbed and crushed, and then the surfaces of the glass fine particles are polished to change the appearance of the prepared glass powder, and the appearance of the prepared glass powder is more similar to a regular sphere.
The crushed fine glass particles move to a turbine classifier at the upper part of the crushing chamber along with the ascending air flow, part of the fine glass particles with larger particle size move under the action of gravity, in the process of rising, the fine glass particles fall back to the crushing chamber along the wall of the machine cavity, the fine glass particles with smaller particle size move to a turbine classifier at the upper part along with the air flow to be classified by the turbine classifier, by adjusting a forced vortex field generated by the rotating speed, fine glass particles which do not meet the requirement of the particle size are thrown to the vicinity of the cylinder wall of the inner cavity because the centrifugal force is greater than the drag force of the airflow and fall back to the crushing chamber for crushing, and micro powder which meets the requirement of the particle size enters the high-temperature spheroidizing chamber through the flow passage of the grading wheel, thereby separating the glass fine powder, reducing the output of the glass powder which is not crushed completely, improving the crushing effect of the glass powder and leading the quality of the prepared glass powder to be better.
After the separated glass fine powder enters the high-temperature spheroidizing chamber, the mechanical property of the glass fine powder is improved through spheroidizing, and the glass fine powder which is finer and more uniform and has more regular appearance is obtained.
After quenching, the gas-solid two-phase flow coming out of the material pipe enters a cyclone separator, the gas-solid two-phase flow is subjected to gas-solid separation through the cyclone separator, and the fine glass powder meeting the particle size requirement is collected to obtain the finished glass powder; the glass fine powder which does not meet the requirement of the particle size enters the bag type dust collector for secondary separation and secondary collection, and the residual gas is purified and then discharged into the atmosphere, so that the pollution to the environment is reduced, and a certain environment-friendly effect is achieved.
In the tabletting process, the glass liquid is directly poured into the tabletting machine for tabletting without water quenching, so that the condition that the quality of the prepared glass tablet is influenced because part of impurities are dissolved in water or hydrolyzed to cause the change of glass components in the glass water quenching process is reduced, and the quality of the produced glass powder is improved.
Preferably, the glass powder comprises the following raw materials: 40-60 parts of lead oxide, 20-30 parts of tellurium dioxide, 10-25 parts of bismuth trioxide, 0-2 parts of ammonium dihydrogen phosphate, 0-15 parts of borax, 1-5 parts of zinc oxide, 2-6 parts of silicon dioxide, 0-1 part of aluminum oxide, 0-1 part of calcium oxide, 0-1 part of magnesium oxide, 0-0.5 part of titanium dioxide, 0-0.5 part of ferric oxide, 2-5 parts of potassium carbonate, 0-3 parts of soda ash, 2-10 parts of lithium carbonate, 3-5 parts of barium carbonate, 1-2 parts of copper oxide, 1-2 parts of zirconium dioxide and 1-3 parts of manganese dioxide; 1-2 parts of antimony trioxide and 1-2 parts of molybdenum trioxide.
Preferably, the heating temperature in the step (2) is 900-.
By adopting the technical scheme, clear molten glass can be obtained in the temperature range.
Preferably, in the step (4), the air compressor is used for controlling the air pressure to be 0.6-1.2MPa, and the jet milling is carried out.
Through adopting above-mentioned technical scheme, the jet milling smashes the glass piece of garrulous through high-speed air current, thereby makes it strike each other, collide to reach better crushing effect, is favorable to obtaining the glass fine particle that the particle size distribution is narrow for follow-up fluidization effect of glass fine particle is better, is favorable to changing the appearance of the glass powder that makes.
Preferably, in the step (7), the spheroidization temperature is 400-: after leaving the high-temperature spheroidizing chamber, cooling the outer wall of the material pipe for conveying the material by using cooling water at the temperature of 10-20 ℃.
Preferably, in the step (7), gas-solid two-phase flow coming out of the material pipe after quenching tangentially enters a cyclone separator, glass fine powder with the particle size of 0.8-20 microns moves downwards, enters an intermediate bin for separation when an upper butterfly valve is opened, then the upper butterfly valve is automatically closed, a lower butterfly valve is opened, and a finished product is collected at a discharge port at the lower part of the cyclone separator to obtain glass powder; and the glass fine powder which does not meet the requirement of the particle size enters the bag type dust collector along with the air flow, is separated again and collected again, and the purified gas is discharged into the atmosphere.
Preferably, in the step (7), a negative pressure of (-0.1) -0.3MPa is generated in the bag-type dust collector by a centrifugal fan.
Through adopting above-mentioned technical scheme, the produced negative pressure of centrifugal fan is favorable to overcoming the resistance that receives when the filter bag filters, has reduced material absorption in the production process and has increased the filtration resistance on the filter bag surface, and then influences the condition of filter effect, has improved bag collector's separation effect.
Preferably, in the step (7), the upper end of the bag type dust collector is provided with a plurality of rows of backflushing pipes, one ends of the backflushing pipes are fixed on the air bag, the other ends of the backflushing pipes are provided with a plurality of branch pipes in parallel, each branch pipe leads to the bag upper opening of one filter bag, and the backflushing pipes are automatically controlled through a pressure regulating valve.
Through adopting above-mentioned technical scheme, by air-vent valve automatic control recoil pipe, the recoil pipe is recoil to the filter bag through each branch pipe to the material that will adsorb outside the filter bag wall in time erodees totally, reaches the effect of clearance filter bag, guarantees that the resistance of filter bag is normal, with the convenience of continuing to carry out filtering separation to the material in the follow-up.
In summary, the present application has the following beneficial effects:
1. according to the method, the fine glass particles are fluidized and spheroidized, so that the spherical glass powder which is fine and uniform and has a more regular shape can be obtained.
Drawings
FIG. 1 is a flow chart of a method provided herein;
FIG. 2 is a block diagram of the bag house in step (7) of the method provided herein, showing primarily the structure of the backwash tube;
FIG. 3 is an SEM image of a glass frit of comparative example 1 of the present application;
fig. 4 is an SEM image of the glass frit prepared in example 1 of the present application.
Reference numerals: 1. back flushing the pipe; 2. a branch pipe; 3. a filter bag; 4. air bags; 5. a pressure regulating valve.
Detailed Description
The present application will be described in further detail with reference to the following drawings and examples.
The raw materials used in the following embodiments may be those conventionally commercially available unless otherwise specified.
Examples
Example 1
Referring to fig. 1, the application discloses a method for changing the morphology of glass powder for conductive silver paste of a solar cell, wherein the raw materials of the glass powder comprise lead oxide, tellurium dioxide, bismuth trioxide, ammonium dihydrogen phosphate, borax, zinc oxide, silicon dioxide, aluminum oxide, calcium oxide, magnesium oxide, titanium dioxide, ferric oxide, potassium carbonate, soda ash, lithium carbonate, barium carbonate, copper oxide, zirconium dioxide and manganese dioxide; antimony trioxide and molybdenum trioxide, and the content of each component is shown in the following table 1.
Referring to fig. 1, the method specifically includes the following steps.
(1) Mixing: stirring and mixing the raw materials of the glass powder uniformly to prepare a mixture;
(2) melting: heating the mixture obtained in the step (1) to 900 ℃, and melting the mixture until the mixture is clear to form molten glass;
(3) tabletting: pouring the glass liquid obtained in the step (2) between two rollers of a tablet press, and rapidly cooling and pressing to form a glass sheet;
(4) crushing: slightly tapping the glass sheet to crack the glass sheet, controlling the air pressure to be 0.6MPa by an air compressor, and carrying out jet milling to prepare glass fine particles with the particle size of 10-80 um;
(5) particle fluidization: feeding the glass fine particles in the step (4) into a crushing chamber, forming centripetal counter-jet flow at the lower part of the crushing chamber by supersonic jet flow generated by the violent expansion and acceleration of compressed air through a ceramic crushing nozzle on a fluidized bed at room temperature, and fluidizing the ground material under the action of pressure difference to obtain glass fine powder;
(6) spheroidizing: and (3) allowing the glass fine powder in the step (5) to enter a turbine classifier, introducing the glass fine powder into a high-temperature spheroidizing chamber for spheroidizing by using negative pressure airflow generated by the turbine classifier, wherein the spheroidizing temperature is 400 ℃, and quenching is performed after spheroidizing, and the quenching method comprises the following steps: after leaving the high-temperature spheroidizing chamber, cooling the outer wall of a material pipe for conveying materials by adopting cooling water at 10 ℃ to obtain gas-solid two-phase flow;
(7) grading: after quenching, gas-solid two-phase flow coming out of the material pipe enters a cyclone separator tangentially, glass fine powder with the particle size of 0.8-20 microns moves downwards, enters an intermediate storage bin for separation when an upper butterfly valve is opened, then the upper butterfly valve is automatically closed, a lower butterfly valve is opened, and a finished product is collected at a discharge port at the lower part of the cyclone separator to obtain the glass powder;
and the glass fine powder which does not meet the requirement of the particle size enters a bag type dust collector along with the air flow, negative pressure of-0.1 MPa is generated in the bag type dust collector through a centrifugal fan, the glass fine powder is separated and collected again, and the purified gas is discharged into the atmosphere.
Referring to fig. 2, a plurality of rows of backflushing pipes 1 are fixed at the upper end of a bag type dust collector adopted by the method, one end of each row of backflushing pipes 1 is fixed on an air bag 4, a plurality of branch pipes 2 are fixed at the other end of the backflushing pipes 1 in parallel, each branch pipe 2 is communicated with the upper opening of a bag of a filter bag 3 in the bag type dust collector, and the backflushing pipes 1 are automatically controlled through a pressure regulating valve 5.
Example 2
The application discloses a method for changing the appearance of glass powder for conductive silver paste of a solar cell, wherein the raw materials of the glass powder comprise lead oxide, tellurium dioxide, bismuth trioxide, ammonium dihydrogen phosphate, borax, zinc oxide, silicon dioxide, aluminum oxide, calcium oxide, magnesium oxide, titanium dioxide, ferric oxide, potassium carbonate, sodium carbonate, lithium carbonate, barium carbonate, copper oxide, zirconium dioxide and manganese dioxide; antimony trioxide and molybdenum trioxide, and the content of each component is shown in the following table 1.
The method specifically comprises the following steps.
(1) Mixing: stirring and mixing the raw materials of the glass powder uniformly to prepare a mixture;
(2) melting: heating the mixture obtained in the step (1) to 1200 ℃, and melting the mixture until the mixture is clear to form molten glass;
(3) tabletting: pouring the glass liquid obtained in the step (2) between two rollers of a tablet press, and rapidly cooling and pressing to form a glass sheet;
(4) crushing: slightly tapping the glass sheet to crack the glass sheet, controlling the air pressure to be 1.2MPa by an air compressor, and carrying out jet milling to prepare glass fine particles with the particle size of 10-80 um;
(5) particle fluidization: feeding the glass fine particles in the step (4) into a crushing chamber, forming centripetal counter-jet flow at the lower part of the crushing chamber by supersonic jet flow generated by the violent expansion and acceleration of compressed air through a ceramic crushing nozzle on a fluidized bed at room temperature, and fluidizing the ground material under the action of pressure difference to obtain glass fine powder;
(6) spheroidizing: and (3) allowing the glass fine powder in the step (5) to enter a turbine classifier, introducing the glass fine powder into a high-temperature spheroidizing chamber for spheroidizing by using negative pressure airflow generated by the turbine classifier, wherein the spheroidizing temperature is 1000 ℃, and quenching is performed after spheroidizing, and the quenching method comprises the following steps: after leaving the high-temperature spheroidizing chamber, cooling the outer wall of a material pipe for conveying materials by using cooling water at 20 ℃ to obtain gas-solid two-phase flow;
(7) grading: after quenching, gas-solid two-phase flow coming out of the material pipe enters a cyclone separator tangentially, glass fine powder with the particle size of 0.8-20 microns moves downwards, enters an intermediate storage bin for separation when an upper butterfly valve is opened, then the upper butterfly valve is automatically closed, a lower butterfly valve is opened, and a finished product is collected at a discharge port at the lower part of the cyclone separator to obtain the glass powder;
and the glass fine powder which does not meet the requirement of the particle size enters a bag type dust collector along with the air flow, a centrifugal fan is used for generating negative pressure of 0.2MPa in the bag type dust collector, the separation is carried out again, the collection is carried out again, and the purified gas is discharged into the atmosphere.
The method adopts the upper end of a bag type dust collector fixed with a plurality of rows of backflushing pipes 1, one end of each row of backflushing pipes 1 is fixed on an air bag 4, the other end of the backflushing pipe 1 is fixed with a plurality of branch pipes 2 in parallel, each branch pipe 2 leads to the upper opening of a bag of a filter bag 3 in the bag type dust collector, and the backflushing pipe 1 is automatically controlled by a pressure regulating valve 5.
Example 3
The application discloses a method for changing the appearance of glass powder for conductive silver paste of a solar cell, wherein the raw materials of the glass powder comprise lead oxide, tellurium dioxide, bismuth trioxide, ammonium dihydrogen phosphate, borax, zinc oxide, silicon dioxide, aluminum oxide, calcium oxide, magnesium oxide, titanium dioxide, ferric oxide, potassium carbonate, sodium carbonate, lithium carbonate, barium carbonate, copper oxide, zirconium dioxide and manganese dioxide; antimony trioxide and molybdenum trioxide, and the content of each component is shown in the following table 1.
The method specifically comprises the following steps.
(1) Mixing: stirring and mixing the raw materials of the glass powder uniformly to prepare a mixture;
(2) melting: heating the mixture obtained in the step (1) to 1050 ℃, and melting the mixture until the mixture is clarified to form molten glass;
(3) tabletting: pouring the glass liquid obtained in the step (2) between two rollers of a tablet press, and rapidly cooling and pressing to form a glass sheet;
(4) crushing: slightly tapping the glass sheet to crack the glass sheet, controlling the air pressure to be 0.9MPa by an air compressor, and carrying out jet milling to prepare glass fine particles with the particle size of 10-80 um;
(5) particle fluidization: feeding the glass fine particles in the step (4) into a crushing chamber, forming centripetal counter-jet flow at the lower part of the crushing chamber by supersonic jet flow generated by the violent expansion and acceleration of compressed air through a ceramic crushing nozzle on a fluidized bed at room temperature, and fluidizing the ground material under the action of pressure difference to obtain glass fine powder;
(6) spheroidizing: and (3) allowing the glass fine powder in the step (5) to enter a turbine classifier, introducing the glass fine powder into a high-temperature spheroidizing chamber for spheroidizing by using negative pressure airflow generated by the turbine classifier, wherein the spheroidizing temperature is 700 ℃, and quenching is performed after spheroidizing, and the quenching method comprises the following steps: after leaving the high-temperature spheroidizing chamber, cooling the outer wall of a material pipe for conveying materials by adopting cooling water at 15 ℃ to obtain gas-solid two-phase flow;
(7) grading: after quenching, gas-solid two-phase flow coming out of the material pipe enters a cyclone separator tangentially, glass fine powder with the particle size of 0.8-20 microns moves downwards, enters an intermediate storage bin for separation when an upper butterfly valve is opened, then the upper butterfly valve is automatically closed, a lower butterfly valve is opened, and a finished product is collected at a discharge port at the lower part of the cyclone separator to obtain the glass powder;
and the glass fine powder which does not meet the requirement of the particle size enters a bag type dust collector along with the air flow, a centrifugal fan is used for generating negative pressure of 0.3MPa in the bag type dust collector, the separation is carried out again, the collection is carried out again, and the purified gas is discharged into the atmosphere.
The method adopts the upper end of a bag type dust collector fixed with a plurality of rows of backflushing pipes 1, one end of each row of backflushing pipes 1 is fixed on an air bag 4, the other end of the backflushing pipe 1 is fixed with a plurality of branch pipes 2 in parallel, each branch pipe 2 leads to the upper opening of a bag of a filter bag 3 in the bag type dust collector, and the backflushing pipe 1 is automatically controlled by a pressure regulating valve 5.
Comparative example
Comparative example 1
The difference from example 1 is that the existing glass frit was used as a blank.
TABLE 1 ingredient content table
Observing the shape of the glass powder in a performance detection test; the microscopic morphologies of the glass frits obtained in example 1 and comparative example 1 were scanned by a Scanning Electron Microscope (SEM), and the results of the measurements are shown in fig. 2 to 3.
By comparing comparative example 1 (see fig. 3) and example 1 (see fig. 4), it can be found that: the method can change the appearance of the glass powder, and the prepared glass powder has a more regular sphere-like shape, and the reason may be that: the glass fine particles form a plurality of streams of material flow through supersonic jet flow generated by the nozzles, the streams of material flow collide with each other along the tangential positions and are converged at the intersection points of the nozzles to generate violent impact, collision and friction, so that the glass fine particles are sheared, rubbed and crushed, and then the surfaces of the glass fine particles are polished to change the appearance of the prepared glass powder, and the appearance of the prepared glass powder tends to be more regular spheroidal; after the separated glass fine powder enters the high-temperature spheroidizing chamber, the mechanical property of the glass fine powder is improved through spheroidizing, and the glass fine powder which is finer and more uniform and has more regular appearance is obtained.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.
Claims (8)
1. A method for changing the appearance of glass powder for conductive silver paste of a solar cell is characterized by comprising the following steps: the method specifically comprises the following steps:
(1) mixing: stirring and mixing the raw materials of the glass powder uniformly to prepare a mixture;
(2) melting: heating and melting the mixture obtained in the step (1) until the mixture is clarified to form molten glass;
(3) tabletting: pouring the glass liquid obtained in the step (2) between two rollers of a tablet press, and rapidly cooling and pressing to form a glass sheet;
(4) crushing: slightly tapping the glass sheet to crack the glass sheet, and performing jet milling to obtain glass fine particles with the particle size of 10-80 um;
(5) particle fluidization: feeding the glass fine particles obtained in the step (4) into a crushing chamber, on a fluidized bed at room temperature, enabling compressed air to pass through a supersonic jet flow generated by the violent expansion and acceleration of a plurality of ceramic crushing nozzles arranged around a grinding cavity to form a centripetal counter-jet flow at the lower part of the crushing chamber, and fluidizing the ground material under the action of pressure difference to obtain glass fine powder;
(6) spheroidizing: the glass fine powder in the step (5) enters a turbine classifier, negative pressure airflow generated by the turbine classifier is brought into a high-temperature spheroidizing chamber for spheroidizing, and quenching is carried out after spheroidizing to obtain gas-solid two-phase flow;
(7) grading: the gas-solid two-phase flow enters a cyclone separator, and the glass fine powder meeting the requirements is collected at a discharge port to obtain glass powder; and (4) collecting the unqualified fine glass powder in a bag type dust collector, and separating again.
2. The method for changing the morphology of the glass powder for the conductive silver paste of the solar cell according to claim 1, wherein the method comprises the following steps: the glass powder comprises the following raw materials: 40-60 parts of lead oxide, 20-30 parts of tellurium dioxide, 10-25 parts of bismuth trioxide, 0-2 parts of ammonium dihydrogen phosphate, 0-15 parts of borax, 1-5 parts of zinc oxide, 2-6 parts of silicon dioxide, 0-1 part of aluminum oxide, 0-1 part of calcium oxide, 0-1 part of magnesium oxide, 0-0.5 part of titanium dioxide, 0-0.5 part of ferric oxide, 2-5 parts of potassium carbonate, 0-3 parts of soda ash, 2-10 parts of lithium carbonate, 3-5 parts of barium carbonate, 1-2 parts of copper oxide, 1-2 parts of zirconium dioxide and 1-3 parts of manganese dioxide; 1-2 parts of antimony trioxide and 1-2 parts of molybdenum trioxide.
3. The method for changing the morphology of the glass powder for the conductive silver paste of the solar cell according to claim 1, wherein the method comprises the following steps: the heating temperature in the step (2) is 900-1200 ℃.
4. The method for changing the morphology of the glass powder for the conductive silver paste of the solar cell according to claim 1, wherein the method comprises the following steps: and (4) controlling the air pressure to be 0.6-1.2MPa by an air compressor, and carrying out jet milling.
5. The method for changing the morphology of the glass powder for the conductive silver paste of the solar cell according to claim 1, wherein the method comprises the following steps: in the step (7), the spheroidization temperature is 400-: after leaving the high-temperature spheroidizing chamber, cooling the outer wall of the material pipe for conveying the material by using cooling water at the temperature of 10-20 ℃.
6. The method for changing the morphology of the glass powder for the conductive silver paste of the solar cell according to claim 1, wherein the method comprises the following steps: in the step (7), gas-solid two-phase flow coming out of the material pipe after quenching enters the cyclone separator tangentially, glass fine powder with the particle size of 0.8-20 microns moves downwards, enters the middle storage bin for separation when the upper butterfly valve is opened, then the upper butterfly valve is automatically closed, the lower butterfly valve is opened, and a finished product is collected at a discharge port at the lower part of the cyclone separator to obtain glass powder;
and the glass fine powder which does not meet the requirement of the particle size enters the bag type dust collector along with the air flow, is separated again and collected again, and the purified gas is discharged into the atmosphere.
7. The method for changing the morphology of the glass powder for the conductive silver paste of the solar cell according to claim 1, wherein the method comprises the following steps: in the step (7), a centrifugal fan is used for generating negative pressure of (-0.1) -0.3MPa in the bag-type dust collector.
8. The method for changing the morphology of the glass powder for the conductive silver paste of the solar cell according to claim 1, wherein the method comprises the following steps: in the step (7), a plurality of rows of backflushing pipes (1) are arranged at the upper end of the bag type dust collector, one end of each backflushing pipe (1) is fixed on the air bag (4), a plurality of branch pipes (2) are arranged at the other end of each backflushing pipe (1) in parallel, each branch pipe (2) leads to the upper opening of one filter bag (3), and the backflushing pipes (1) are automatically controlled through pressure regulating valves (5).
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