Composition and method of forming low-carbon, amorphous siliceous ash from siliceous waste material
AssigneeChK Group, Inc.
InventorRajan K. Vempati
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Abstract
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.
Claims21
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 800° 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.
A method of producing low-carbon, amorphous siliceous ash from siliceous or aluminosilicate waste material, the method comprising:
- providing a portion of siliceous waste materials;
- pyrolyzing the siliceous waste materials in a tube furnace at a temperature of between about 500 and 800° C. for at least 0.5 hours;
- simultaneous to the pyrolysis, passing a continuous stream of air over the portion of siliceous waste material and drawing off gaseous products from the pyrolysis, thus forming
- wherein the ratio of the weight of the siliceous waste material to the volume of the tube furnace is between about 0.02 and 0.10;
- and
- 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.
A low-carbon, amorphous siliceous ash composition derived from siliceous waste material comprising:
- particles of a size substantially between about 10-100 μm;
- wherein the SiO2 content of the particles is greater than 94 percent by weight of the particles;
- and wherein the carbon content of the particles is between about 0 and 3 percent by weight of the particles;
- and wherein the SiO2 and carbon are amorphous.
Dependencies are inferred from the claim text.