Iron based roofing granules and method of coloring same

Details Iron based roofing granules and method of coloring same Iron based roofing granules and method of coloring same

1993-11-10

2000-12-05

Watkins, III, William P.

Chemistry of inorganic compounds

Oxygen or compound thereof

Metal containing

428143, 428145, 428150, 428149, 75353, 75354, 52518, 52554, 52555, C01G 4902, E04D 100

Patent

active

061562890

ABSTRACT:
Method of preparing colored roofing granules (18) from granulated mineral-containing matter having an elemental iron content of about 15% to about 70% is disclosed. The method comprises heating the granules (18) to a temperature of from about 450.degree. C. to about 1,000.degree. C. and maintaining the temperature for a period of time sufficient to effect a color change in the granules. The resulting oxidized granules are permanently colored and will not fade in use.

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