20150110701 | BIOGENIC SILICA AS A RAW MATERIAL TO CREATE HIGH PURITY SILICON - A low cost process is provided for creating high purity silicon from agricultural waste, particularly rice hull ash. The process uses a series of chemical and thermal steps to yield high purity silica while using less energy and more efficient chemical processes. The high purity silicon features fewer impurities that negatively affect the use of high purity for PV cells and reduces capital and operating costs of processes to yield ultra-pure silicon. | 04-23-2015 |