TY - JOUR
AU - Urbach, H.
AB - Two methods are described to prepare high-purity silica to be employed as a low-cost starting material for solar-grade silicon production. In the first process, abundantly available quartz sand is purified by fusing it with glass forming oxides to form a melt from which thin glass fibres are drawn. Subsequent treatment of the fibres with hot HCl leads to an ion exchange whereby all non-siliceous oxides are removed from the glass network leaving an insoluble matrix of high-purity silica. The second method employs sodium hexafluosilicate (Na2SiF6), prepared from fluosilic acid, a by-product of the fertilizer industry. The Na2SiF6 is thermally decomposed to yield gaseous SiF4 which is subsequently hydrolysed in an ammonia solution. With both methods silica having a purity of >99.99% was obtained.
TI - New methods to prepare high-purity silica
JF - Journal of Materials Science
DO - 10.1007/BF00563069
DA - 2004-10-16
UR - https://www.deepdyve.com/lp/springer-journals/new-methods-to-prepare-high-purity-silica-DIaCrqJlmj
SP - 1710
EP - 1717
VL - 19
IS - 5
DP - DeepDyve
ER -