Selection and market prospect analysis of quartz s

Selection and market prospect analysis of quartz sand for 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, which 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 requires its direct sunlight transmittance to be more than% of the original (equivalent to 3mm standard thickness), while the transmittance of ordinary float glass is generally 86%. 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 SiO2 siliceous raw material introduced by resolution 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 a few areas such as Fengyang, Anhui Province 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 engineering, and the scientific and rational 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, Guo Ban Fa [2016] No. 34 document "guiding opinions on promoting 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 level of comprehensive utilization; 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

development opportunities brought by market orientation

China's glass industry is the largest in the world. Of course, the demand for quartz sand is also very huge. The glass market accounts for the main part of industrial quartz sand. It can be said that the industry situation of ultra white glass determines the market demand and development prospect of low iron quartz sand. In recent years, the booming development of ultra white glass industry has brought unprecedented opportunities for the research and production of low iron quartz sand

with the upgrading of economic development mode and demand structure, the demand for traditional glass products will remain basically stable or slightly declining, and the demand for energy-saving glass and special glass will continue to grow. It is expected that during the "13th five year plan" period, glass processing products will grow steadily, especially the rapid development of high-performance energy-saving glass, and the glass deep processing rate is expected to reach 60% in 2020

with the transfer of the international photovoltaic module manufacturing center to China, ultra white calendered glass has developed rapidly since 2006. By the end of 2015, there were 76 furnaces and 169 ultra white calendered glass production lines in China, with a total scale of 22850t/D, ranking first in the world. The production concentration of solar calendered glass enterprises is at a high level. According to the statistics of China architectural glass and Industrial Glass Association, the top five solar ultra white calendered glass manufacturers in China account for 57.6% of the national solar ultra white calendered glass market share

with the continuous development of China's electronics, aerospace, building materials and other industries, a variety of fiber (including carbon fiber, glass fiber, polyester fiber, etc.) 3D printing material exhibitions have been developed, and the demand for high-purity quartz sand is also increasing. According to a report released by acute markets, the Market Research Institute, the low iron ultra white glass for concentratingsolar power (CSP) will increase from US $355 million in 2013 and through the power of intelligent vehicle terminals, it technology and big data to US $11.3 billion in 2020, accounting for 15% of the total glass market in 2020, which is equivalent to that of automotive glass. With the increasing demand for ultra white glass, the development of quartz sand industry will be driven

based on the excellent performance of ultra white glass and its irreplaceable position in green energy, high-end cars, high-end buildings, high-end gardening and high-end furniture, the future production and demand will increase significantly, which makes the large-scale supply of raw materials for ultra white glass a bottleneck. Because the mineral resources and reserves of quartz raw materials with the largest consumption in the production of ultra white glass are extremely limited, while the low-grade quartz source is very abundant. To solve this development bottleneck and meet the high specification requirements of ultra white glass for production raw materials, there are many advantages in developing all kinds of stones using universal material testing machine products. The deep processing technology of British raw materials is imperative to improve the grade of quartz raw materials