| 摘要 |
The present invention is a method of manufacturing low carbon content (hence, an off-white color), amorphous (non-crystalline) siliceous ash from ordinary siliceous waste materials such as, for example, rice hulls, and plant residues from biogas generation. A portion of plant waste materials is pyrolyzed in a furnace such as a tube furnace. Next, the material is pyrolyzed in a tube furnace at a temperature of between about 500 and 800° C. for at least 0.5 hours to 3 hours. Simultaneous to the pyrolysis, a continuous stream of air is passed over the material, and gaseous products from the pyrolysis are drawn off. The siliceous ash is thus formed.
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