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Ultra-white glass can be so - amazing

  • Author:Fanyu
  • Source:Chinamirrormanufacturer.com
  • Release on:2017-11-23
Ultra-clear glass is an ultra-low-transparent low-iron glass, also known as low-iron glass, high-transparent glass, known as the "crystal prince" of the glass family. With the advantages of low self-explosion rate, color consistency, high visible light transmittance, good permeability, and low UV transmittance, it is a high-quality, multi-functional new high-grade glass variety. Mainly used in solar cells, solar thermal mirrors, high-end architectural decoration electronic products, high-end car glass and other industries.
Ultra-white glass as the basic product of the solar industry requires that the direct transmittance of solar light reaches more than % (equivalent to a standard thickness of 3 mm), and that of ordinary float glass is generally 86%. To achieve this goal, the content of coloring oxidant Fe2O3 must be controlled to 150ppm or less. It can be said that the ultra-white glass production process is the process of controlling the Fe2O3 content.
TheReasonable choice of raw materials
Because the iron oxide not only affects the transmittance of the glass due to the coloration of the glass, but also because the oxide of iron has a strong absorption effect on the thermal radiation, the radiant heat is mostly absorbed by the surface layer glass fluid, so that the upper and lower layers of the glass fluid have obvious temperature. Gradient causes convection difficulties in the molten glass in the melting furnace, increasing the difficulty of melting and fining. In order to effectively reduce the iron content of glass, first of all, starting from raw materials, effectively selecting raw materials containing low amounts of Fe2O3 is a prerequisite for achieving ultra-white glass production.
TheUltra-white glassThe raw materials used are dolomite, limestone, feldspar, and silica sand. For example, magnesium oxide can effectively control the hardening rate and devitrification performance of glass, which is mainly the high-temperature physical properties of the glass. At the same time, it improves the melting properties of the glass and acts as a fluxing aid. Dolomite is the main raw material for the introduction of magnesium oxide. Limestone is another important mineral raw material. Limestone Fe2O3 currently supplied for ultra-white glass is below 50 ppm.
Among many raw materials, SiO2 is the main body forming the glass skeleton. The introduction of SiO2 siliceous material is the most important and most used raw material in glass production, and is also the first to be solved and controlled in the production of ultra-white glass.
There are two main sources. One is the quality of high-quality quartzite itself to meet the requirements of low-iron glass production in the process to minimize the mixing of iron. Traditional stone grinding can be used, and only a few areas such as Anhui Fengyang exist in the country. The other is the flotation and other beneficiation treatment of high-quality silica sand for ordinary flat glass, so that it can meet the requirements of this relatively high cost of sand, which is more than twice as high as the aforementioned natural quartzite. At present, both methods can control the content of Fe2O3 to 100 ppm or less. In this way, the iron introduced due to silica sand can be controlled below 73 ppm.
TheIndustrial policy-oriented development opportunities
Building energy efficiency is a comprehensive system project, and the scientific and rational use of processed glass with energy-saving, safe and environmentally friendly characteristics is one of the most important aspects of this system engineering.
In recent years, related favorable policies have been introduced one after another. For example, the “Guiding Opinions on Promoting Steady Growth, Adjusting Structure, and Increasing Benefit of Building Materials Industry” issued by the State Administration of Industry [2016] No. 34 clearly states that encouragement is made for the integration of silica sand, quartz sand, and aggregates for sand aggregates and waste aggregates for glass. , increase the level of comprehensive utilization; the development plan of building materials industry (2016-2020) clearly states: We must vigorously develop ultra-white glass and quartz glass products, refractories, and building sanitary ceramics, etc.; Ministry of Industry and Information Technology [2016] No. 344 Document “Industry The plan for the development of technological innovation capability (2016-2020) clearly stated that it is necessary to focus on the building materials industry such as flat glass, building sanitary ceramics, and refractories. The introduction of favorable policies undoubtedly created a favorable policy environment for the development of the glass industry and the quartz sand industry and provided opportunities for its development.
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