| 摘要 |
Among the methods described herein are methods of making a low-specific gravity particulate including the steps of: (a) providing combustion products of carbonaceous materials comprising silica and an aluminum oxide, (b) mixing the combustion products with a binder to create a pelletizable mixture; (c) pelletizing the combustion products of carbonaceous materials to create a pellet, and (d) sintering the combustion products of carbonaceous materials to create a particulate comprising silica and an aluminum oxide in an amount of about 0.1% to about 25% by weight and having at least one void, a specific gravity of less than about 2.2, a particle size of 8 U.S. Mesh or smaller, and a substantially spherical shape.
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