Formula and preparation method of ultra-high transmittance photovoltaic rolled glass

Abstract

The invention discloses a formula of photovoltaic rolled glass with ultrahigh transmittance. The formula comprises the following batch materials in percentage by mass: 65%-69% of quartz sand, 14.5%-16.5% of sodium carbonate, 11%-12% of dolomite, 3%-4% of limestone, 0.6%-0.8% of aluminum hydroxide and 1.33%-3.93% of a compound clarifying agent, the preparation method comprises the following steps: step 1, taking the quartz sand, the sodium carbonate, the dolomite, the limestone, the aluminum hydroxide and the composite clarifying agent according to the mass percent, and then mixing in a high-speed mixer; 2, melting the raw materials mixed in the step 1 in a high-temperature furnace for 2-4 hours; and step 3, after melting is finished, cooling the molten glass obtained in the step 2 to obtain finished glass. According to the invention, by reasonably matching the glass raw materials, namely the ratio, especially adjusting the dosage of the mirabilite, the sodium nitrate, the cerium hydroxide and the sodium pyroantimonate, and replacing the oxidation effect of a high-cost material sodium pyroantimonate with a low-cost material, the clarification of the glass is effectively improved, and the cost of the sodium pyroantimonate raw material can be greatly saved while the transmittance of the glass is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of glass manufacturing, and in particular to a formula and preparation method of ultra-high transmittance photovoltaic rolled glass. Background Art

[0002] The low-carbon development model with the goals of "carbon peak" and "carbon neutrality" has become an effective means for countries to address climate change. Under the dual-carbon goals, the market demand for solar cells shows a steady growth trend. As an essential material for solar cell modules, the transmittance of photovoltaic rolled glass directly affects the power generation of the modules. Therefore, a high-transmittance and low-cost photovoltaic rolled glass is needed to solve the above problems. After testing, when the photovoltaic band transmittance of the glass is increased by 1%, the power generation of the module also increases accordingly. Methods to improve the photovoltaic transmittance of the glass include: changing the surface structure of the glass to reduce the secondary reflection of light; coating an anti-reflection film to increase the transmittance; reducing the iron content in the glass, etc.

[0003] Iron exists in two states, Fe 2+ and Fe 3+ in sodium-calcium-silicate glass. The 3d orbit of Fe 3+ ion is in a half-filled state, and the electrons are in a relatively stable state. The energy difference between the ground state and the excited state is large, and the energy of visible light is not enough or very difficult to excite it. The light absorption caused in the visible light region is very small (a small amount of absorption at 380nm, 420nm, and 435nm), and the impact on the transmittance is relatively small; Fe 2+ ion produces a strong absorption peak at 1050nm, and the absorption band is relatively wide, starting from 600nm to the near-infrared, which is exactly in the photovoltaic response band of solar cells. And the light absorption ability of Fe 2+ ion is about 10 times that of Fe 3+ . Therefore, converting Fe 2+ to Fe 3+ in the glass, reducing the content of Fe 2+ in the glass, reducing the absorption of sunlight by Fe 2+ , and improving the light transmission ability of the glass, thereby increasing the transmittance of photovoltaic rolled glass.

[0004] However, in the prior art, the iron content in the glass is restricted by the iron content of the raw materials. When the iron content in the raw materials is reduced to a certain extent, the cost of iron removal is relatively high, resulting in a relatively high production cost of the glass. Summary of the Invention

[0005] 1. Technical Problems to be Solved

[0006] The object of the present invention is to solve the problem that the iron content in glass in the prior art is restricted by the iron content of raw materials, and the cost of iron removal is relatively high when the iron content in the raw materials is reduced to a certain extent, and a formula and a preparation method of ultra-high transmittance photovoltaic rolled glass are proposed.

[0007] 2. Technical solution

[0008] In order to achieve the above object, the present invention adopts the following technical solutions:

[0009] A formula of ultra-high transmittance photovoltaic rolled glass, comprising batch materials with the following mass percentages: quartz sand 65%-69%, soda ash 14.5%-16.5%, dolomite 11%-12%, limestone 3%-4%, aluminum hydroxide 0.6%-0.8% and composite fining agent 1.33%-3.93%.

[0010] Preferably, it comprises batch materials with the following mass percentages: quartz sand 65%, soda ash 16.5%, dolomite 11%, limestone 4%, aluminum hydroxide 0.6% and composite fining agent 3.93%.

[0011] Preferably, it comprises batch materials with the following mass percentages: quartz sand 69%, soda ash 14.5%, dolomite 12%, limestone 3%, aluminum hydroxide 0.8% and composite fining agent 1.33%.

[0012] Preferably, it comprises batch materials with the following mass percentages: quartz sand 68%, soda ash 15.5%, dolomite 11.5%, limestone 3.5%, aluminum hydroxide 0.7% and composite fining agent 2.63%.

[0013] Preferably, the composite fining agent comprises raw materials with the following mass percentages: sodium nitrate 1.2%-2.5%, cerium hydroxide 0.02%-0.15%, sodium pyroantimonate 0.03%-0.08% and mirabilite 0.8%-1.2%.

[0014] The present invention also proposes a preparation method of ultra-high transmittance photovoltaic rolled glass, comprising the following steps:

[0015] Step 1: First, take quartz sand, soda ash, dolomite, limestone, aluminum hydroxide and composite fining agent according to the above mass percentages, and then mix them in a high-speed mixer;

[0016] Step 2: Put the raw materials mixed in Step 1 into a high-temperature furnace and melt them for 2-4 hours to obtain glass liquid;

[0017] Step 3: After the melting is completed, cool down the glass liquid obtained in Step 2 to obtain finished glass.

[0018] Preferably, the temperature of the high-temperature furnace in step 2 is 1400-1600 °C.

[0019] 3. Beneficial effects

[0020] Compared with the prior art, the advantages of the present invention are as follows:

[0021] (1) In the present invention, the glass composition formula can increase the components of chemical decolorizing agents, oxidants, and defoaming agents, convert Fe 2+ to Fe 3+ , reduce the absorption of sunlight by Fe 2+ , improve the light transmission ability of the glass, and increase the transmittance of the entire solar energy band.

[0022] (2) In the present invention, by reasonably matching the glass raw materials and their ratios, especially adjusting the dosages of mirabilite, sodium nitrate, cerium hydroxide, and sodium pyroantimonate, and replacing the oxidation effect of the high-cost material sodium pyroantimonate with low-cost materials, the glass clarification is effectively increased, and while improving the glass transmittance, the raw material cost of sodium pyroantimonate can be greatly saved. Specific embodiments

[0023] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0024] Example 1:

[0025] A formula for an ultra-high transmittance photovoltaic rolled glass includes batch materials with the following mass percentages: silica sand 65%-69%, soda ash 14.5%-16.5%, dolomite 11%-12%, limestone 3%-4%, aluminum hydroxide 0.6%-0.8%, and a composite fining agent 1.33%-3.93%. The composite fining agent includes raw materials with the following mass percentages: sodium nitrate 1.2%-2.5%, cerium hydroxide 0.02%-0.15%, sodium pyroantimonate 0.03%-0.08%, and mirabilite 0.8%-1.2%.

[0026] In this embodiment, a preparation method for an ultra-high transmittance photovoltaic rolled glass includes the following steps:

[0027] Step 1: First, take silica sand, soda ash, dolomite, limestone, aluminum hydroxide, and a composite fining agent according to the above mass percentages, and then mix them in a high-speed mixer;

[0028] Step 2: Put the raw materials mixed in step 1 into a high-temperature furnace for melting for 2-4 hours to obtain glass liquid;

[0029] Step 3: After the melting is completed, cool down the glass liquid obtained in step 2 to obtain the finished glass.

[0030] In this embodiment, chemical decolorants, oxidants, and defoamers can be added to the glass composition formula to convert Fe 2+ to Fe 3+ and reduce the absorption of sunlight by Fe 2+ , thereby improving the light transmission ability of the glass and enhancing the transmittance of the entire solar spectrum.

[0031] In this embodiment, by reasonably matching the glass raw materials, i.e., the ratio, especially by adjusting the dosages of mirabilite, sodium nitrate, cerium hydroxide, and sodium pyroantimonate, and replacing the high-cost material sodium pyroantimonate with a low-cost material for oxidation, the glass clarification is effectively increased, and while improving the glass transmittance, the raw material cost of sodium pyroantimonate can be greatly saved.

[0032] Example 2:

[0033] It has the implementation content of the above embodiment. For the specific implementation manners of the above embodiment, reference can be made to the above description, and the embodiments here will not be repeated in detail; in the embodiment of the present application, the difference from the above embodiment is as follows:

[0034] In this embodiment, various raw materials are weighed according to the proportions in Table 1, mixed, and melted in a high-temperature furnace at 1500 °C for 3.0 hours. The obtained glass is subjected to optical performance tests, and the test results are uniformly converted to 2.0 mm, as shown in Table 1.

[0035] In this embodiment, the addition amount of the composite clarifying agent directly determines the transmittance of the glass for photovoltaic applications. The following analyzes the defined ranges of the addition amounts of various clarifying agents:

[0036] In this embodiment, sodium nitrate decomposes to release oxygen when heated to above 350 °C. It is a good decolorant, clarifying agent, oxidant, and flux for glass. However, when the addition amount of sodium nitrate is too high, the nitrogen oxides released during decomposition also pollute the atmosphere. Therefore, the addition amount of sodium nitrate should be controlled below 2.5%.

[0037] In this embodiment, cerium hydroxide can decompose to form cerium oxide and oxygen at high temperatures. Cerium oxide has strong oxidizing properties. Cerium exists in two forms, Ce 3+ and Ce 4+ , in the glass. Ce 4+ can strongly absorb ultraviolet light (240 nm); the absorption peak of Ce 3+ is at 314 nm, which does not affect the photovoltaic transmittance of the glass; cerium oxide can also increase the light transmission ability of the glass, and the transmittance of the entire solar spectrum is relatively high; however, excessive cerium oxide will act together with titanium in the glass to make the glass colored yellow. Therefore, the addition amount of cerium hydroxide should be controlled between 0.02 - 0.15%.

[0038] In this embodiment, mirabilite decomposes at 1120 - 120 °C to release oxygen and SO3, which plays an important role in clarification; however, excessive mirabilite erodes the refractory of the kiln furnace more severely, and the undecomposed mirabilite forms nitre water on the glass surface. Therefore, the addition amount of mirabilite should be controlled at 0.8 - 1.2%.

[0039] Table 1

[0040]

[0041] As mentioned above, the above are only the preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered within the protection scope of the present invention.

Claims

1. A formulation for ultra-high transmittance photovoltaic rolled glass, characterized in that, The batch material includes the following components by mass percentage: silica sand 65%-69%, soda ash 14.5%-16.5%, dolomite 11%-12%, limestone 3%-4%, aluminum hydroxide 0.6%-0.8%, and compound fining agent 1.33%-3.93%.

2. The formulation for ultra-high transmittance photovoltaic rolled glass according to claim 1, characterized in that, The batch material includes the following components by mass percentage: silica sand 65%, soda ash 16.5%, dolomite 11%, limestone 4%, aluminum hydroxide 0.6%, and compound fining agent 3.93%.

3. The formulation for ultra-high transmittance photovoltaic rolled glass according to claim 1, characterized in that, The batch material includes the following components by mass percentage: silica sand 69%, soda ash 14.5%, dolomite 12%, limestone 3%, aluminum hydroxide 0.8%, and compound fining agent 1.33%.

4. The formulation for ultra-high transmittance photovoltaic rolled glass according to claim 1, characterized in that, The batch material includes the following components by mass percentage: silica sand 68%, soda ash 15.5%, dolomite 11.5%, limestone 3.5%, aluminum hydroxide 0.7%, and compound fining agent 2.63%.

5. The formulation for ultra-high transmittance photovoltaic rolled glass according to any one of claims 1-4, characterized in that, The compound fining agent includes the following raw materials by mass percentage: sodium nitrate 1.2%-2.5%, cerium hydroxide 0.02%-0.15%, sodium pyroantimonate 0.03%-0.08%, and mirabilite 0.8%-1.2%.

6. A preparation method for ultra-high transmittance photovoltaic rolled glass according to any one of claims 1-5, characterized in that, It includes the following steps: Step 1: First, take silica sand, soda ash, dolomite, limestone, aluminum hydroxide, and compound fining agent according to the above mass percentages, and then mix them in a high-speed mixer; Step 2: Put the raw materials mixed in Step 1 into a high-temperature furnace for melting for 2-4 hours to obtain molten glass; Step 3: After the melting is completed, cool down the molten glass obtained in Step 2 to obtain the finished glass.

7. The preparation method for ultra-high transmittance photovoltaic rolled glass according to claim 6, characterized in that, The temperature of the high-temperature furnace in Step 2 is 1400-1600 °C.

Images