USBM and NREL Study Solar-Powered Perlite Procudtion

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Researchers at the U.S. Bureau of Mines (USBM) and the National Renewable Energy Laboratory (NREL) are looking into the idea of producing perlite using concentrated solar energy. Perlite is a natural volcanic rock that is expanded by rapid heating to between 870° and 1100°C. It is used as an insulation material and as a lightweight filler for drywall and other building products. Tests were done using an existing NREL solar furnace, which concentrates solar energy onto a small area. Private-sector partners are being sought, according to USBM mining engineer Doug Ward. For information, call Ward at USBM (303/236-0428 ext. 226), or Kent Scholl at NREL (303/384-7496).