CPC C04B 20/0008 (2013.01) [B29C 44/3403 (2013.01); C04B 20/026 (2013.01); C04B 20/04 (2013.01); C04B 20/1029 (2013.01); C04B 20/1088 (2013.01); C04B 40/04 (2013.01); E04C 5/073 (2013.01)] | 11 Claims |
1. A method for producing a lightweight carbon aggregate, comprising:
pulverizing coal into a fine coal powder;
blending the fine coal powder and at least one additive to form a coal mixture;
pelletizing the coal mixture using a binder to make coal aggregate comprising fine aggregates and course aggregates;
foaming the coal aggregate to cause volatilization and entrapment of volatized gases in a melted liquid phase at atmospheric pressure by heating to a temperature between 250° C. and 500° C. under an inert gas; and
pyroprocessing the coal aggregate to a temperature between 750° C. and 1240° C. under an inert gas to form a vitreous lightweight aggregate having an apparent density of less than 85 pounds per cubic foot.
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