Patent ID: 6444186
Filing Date: 2002-09-03
Classification: C01B,C04B,Y02W

Abstract:
A method of producing low carbon, amorphous siliceous ash from siliceous or alumino-silicate waste materials, the method comprising:providing a portion of siliceous waste materials; pyrolyzing the siliceous waste materials at a temperature of between about 500 and 800Â° C. for at least 0.5 hours while simultaneously agitating the portion of siliceous waste materials; simultaneous to the pyrolysis, passing a continuous stream of air over the portion of siliceous waste materials, and drawing away gaseous products formed from the pyrolysis, thus forming siliceous ash; wherein the siliceous ash has a carbon content of between about 0 and 3 percent by weight of the siliceous ash and a SiO2 content of greater than 94 percent by weight of the siliceous ash.