Most of the photovoltaic glass enterprises choose sodium pyroantimonate as a clarifying agent, due to sodium pyroantimonate in the decomposition temperature within the country, do not have to go through the transformation from low to high valence, can be directly decomposed to release oxygen, is an excellent glass clarifying agent. Practice has proved that the role of sodium pyroantimonate clarification is mainly concentrated in 1400 ~ 1450 ℃ question, at 1450 ℃ to maintain 40 ~ 50min, the glass liquid can be fully clarified.
In the glass manufacturing industry, sodium pyroantimonate and antimony trioxide is also used to manufacture a variety of properties and uses of glass, such as optical glass, infrared transmission glass and chemical fiber glass, the use of solar energy heat reflection glass. Sodium pyroantimonate is an excellent clarifier and decolorizer for high-grade glass, as the ferrous oxide of the lime green pigment in glass, affecting the color and transparency of the product, sodium pyroantimonate is needed as a clarifier, so that the iron oxide is converted to iron trioxide, the impurity disappears and the glass is clarified. Manganese is also added to the material, manganese nitrate, manganese nitrate oxygen discharge temperature is also in the 1400-1450 ℃, it is decomposed at high temperatures after the production of O2 and SO2 on the growth of bubbles and dissolution plays an important role. As the clarification temperature of the two clarifiers is concentrated in the same temperature range, so it can play a good role in clarification. This is also for the development of the clarification temperature for the theoretical basis. Conventional calendered glass its clarifying agent for manganese nitrate in the use of the process needs to be pre-mixed with a certain amount of coal dust before use, due to the production of ultra-white calendered glass its coal dust will make the glass liquid iron oxide reduced to ferrous oxide or iron sulfide, so that the glass becomes yellow glass affecting the transparency of the glass. So the production of ultra-white calendered solar photovoltaic glass does not use coal dust, appropriately increase the amount of nitrous oxide but increase the amount of use shall not exceed 0.5% of the amount of glass. If other clarifiers are used to reduce the use of nitrate available sodium nitrate, sodium pyroantimonate, antimony trioxide, etc..
The demand for sodium pyroantimonate and the quality of sodium pyroantimonate have put forward a high level of essentials. Among them, the dosage of sodium nitrate can not be too high. Its decomposition of gas nitrogen oxides is difficult to deal with. Diantimony oxide, manganese nitrate, sodium nitrate can be used as a clarifying agent according to the corresponding proportion of the mixture. The total proportion does not exceed 1.1% or so. At present, the glass factory produces super white glass with composite clarifying agent is more. To reduce production costs and reduce the emission of exhaust gas has a positive significance. There are also production of ultra-white calendered photovoltaic glass production plant to ensure that the clarification and glass transmittance, its conventional ratio of clarifying agent usage is: nitrate, sodium nitrate, sodium pyroantimonate its ratio of: 0.6: 0.2: 0.2 = 1% so according to the 100Kg of dry base material calculated as the total amount of 1Kg. production scale output amount of 250 td of glass kiln, which 30% of the broken glass dosage. The mix dosage is 82.682% conversion rate to glass liquid, i.e. 212 td of mix is required. The daily amount of integrated clarifier for 19%, 2.12t sodium nitrate to 0.2 ratio taken as 424Kgd. By calculating the hourly emissions from the exhaust gas 170mg/m3, so its nitrogen oxides emissions are completely less than the national regulations of 70omgm3 emissions.
