Optical Glass Based on the East Sayan Mountain Quartzites

Advanced Processing Techniques and Impurity Management for High-Purity Quartz in Diverse Industrial Applications

“…In addition, it has good heat resistance and excellent thermal stability, which can be used for a long time at 1200 °C, higher than ordinary glass with a temperature resistance of 400 °C. Compared with regular glass, its thermal expansion coefficient is minimal, can withstand severe temperature changes, and has good thermal shock resistance [22]. The main goal of this review is to delve into the control of impurities during the purification of high-purity quartz (HPQ) and its application in critical industries such as Some countries in the United States and Europe pioneered research on the substitution of quartz ore with crystal for the production of high-purity quartz sand.…”

“…For instance, quartz glass exhibits remarkable resistance to acid corrosion-excluding interactions with hydrofluoric acid and hot phosphoric acid-being 30 times more resistant than standard industrial ceramics (such as alumina ceramics) and 150 times more resistant than typical stainless steel grades (such as 304 or 316 stainless steel), thereby offering significant advantages in environments requiring chemical inertness. In addition, it has good heat resistance and excellent thermal stability, which can be used for a long time at 1200 • C, higher than ordinary glass with a temperature resistance of 400 • C. Compared with regular glass, its thermal expansion coefficient is minimal, can withstand severe temperature changes, and has good thermal shock resistance [22].…”

EPR study of the E’ defects in optical glasses and cristobalite

“…The melt was held at this pressure for 1 hour, after which power was turned off [29]. Optical absorption spectra demonstrated that all the produced glass samples are characterized by a high light-transmission capacity in a broad spectral range and conformed to the parameters of the so-called dry glass of the KI grade [2].…”

“…Considering the growing demand for high-quality raw quartz materials and the depletion of traditional quartz reserves, a critical need emerges to explore and estimate new prospective sources of high-purity quartz materials. The East Sayan mountain quartzites represent one of the possible sources of high-quality raw quartz [2]. High-purity quartz has become a strategic mineral with applications in high-tech industries that include semiconductors, high-temperature lamp tubing, telecommunications and optics, microelectronics, and solar silicon applications.…”

“…-The beneficiation processes included calcination of the quartz concentrate at 1450, 1500 and 1550 • C with partial or full transformation of high-temperature quartz to β-cristobalite [29]. Samples of quartz glasses were produced from the beneficiated quartzite [2]. The contents of impurities in the quartz concentrate and cristobalite is presented in table 1.…”