Application and development opportunities of the h

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Application and development opportunities of ultra white glass

ultra white glass is a kind of ultra transparent low iron glass, also known as low iron glass and high transparent glass. It is known as the "crystal Prince" of the glass family. It has the advantages of low self explosion rate, color consistency, high visible light transmittance, good permeability and low ultraviolet transmittance. It is a new high-grade glass variety with high quality and multi-function. It is mainly used in solar cells, solar thermoelectric mirrors, high-end building decoration electronic products, high-end car glass and other industries

as a basic product of the solar energy industry, ultra white glass is required to have a direct sunlight transmittance of more than% or more (equivalent to 3mm standard thickness), while ordinary float glass has a light transmittance of 86% to achieve the effects of snow white, earthy gold, silver gray and other metals. To achieve this goal, the content of coloring oxidant Fe2O3 must be controlled below 150ppm. It can be said that the production process of ultra white glass is the process of controlling Fe2O3 content

reasonable selection of raw materials

because iron oxide not only tints the glass and affects the light transmittance of the glass, but also because iron oxide has a strong absorption effect on thermal radiation, most of the radiant heat is absorbed by the surface liquid glass, resulting in obvious temperature gradient in the upper and lower layers of the liquid glass, which leads to difficulties in convection of the liquid glass in the furnace and increases the difficulty of melting and clarification. In order to effectively reduce the iron content of glass, we should first start with raw materials. Effectively selecting raw materials with low Fe2O3 content is the prerequisite for realizing the production of ultra white glass

raw materials for ultra white glass include dolomite, limestone, feldspar and silica sand. For example, magnesium oxide can effectively control the hardening rate and crystallization performance of the liquid glass, mainly the high-temperature physical properties of the glass, and improve the melting performance of the glass to play a role of melting aid. Dolomite is the main raw material for the introduction of magnesium oxide. Limestone is another important mineral raw material. At present, the Fe2O3 content of limestone supplied for ultra white glass is below 50ppm

among many raw materials, SiO2 is the main body to form the glass skeleton. The introduced SiO2 siliceous raw material is the most important and most used raw material in glass production, and it is also the first to be solved and controlled in the production of ultra white glass

there are two main sources. One is high-quality quartzite, whose own grade meets the requirements of low iron glass production. In the processing process, the mixing of iron should be minimized. The traditional stone mill can be used, which is only available in Anhui Fengyang and a few other areas in China. The other is to carry out flotation and other beneficiation treatments on high-quality silica sand used for ordinary flat glass to meet the requirements. The cost of this kind of sand is relatively high, which is more than twice that of the natural high-quality quartzite mentioned above. At present, both methods can control the content of Fe2O3 below 100ppm. In this way, the iron introduced by silica sand can be controlled below 73ppm

development opportunities brought by industrial policy orientation

building energy conservation is a comprehensive system supplement: Engineering in forming conditions, and the scientific and reasonable use of processed glass with energy-saving, safety and environmental protection characteristics is one of the extremely important links in this system engineering

in recent years, relevant favorable policies have been introduced. For example, GBF [2016] No. 34 document "guiding opinions on promoting the steady growth, adjusting structure and increasing benefits of the building materials industry" clearly points out that: encourage the integration of silica sand for glass, quartz sand and tailings, waste rock and other resources for sandstone aggregate, and improve the thermal insulation performance and high comprehensive utilization level; The development plan of building materials industry (year) clearly points out that: we should vigorously develop industries such as ultra white glass and quartz glass products, refractories and building and sanitary ceramics; The Ministry of industry and information technology regulation [2016] No. 344 document "development plan for industrial technological innovation capability (2016-2020)" clearly points out that it is necessary to focus on the development of building materials industries such as flat glass, building and sanitary ceramics and refractories. The introduction of favorable policies undoubtedly created a good policy environment for the development of glass industry and quartz sand industry, and provided opportunities for their development

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