Process for improving the color and brightness of discolored goe

Details Process for improving the color and brightness of discolored goe Process for improving the color and brightness of discolored goe

1997-04-23

1999-04-06

Green, Anthony

Compositions: coating or plastic

Materials or ingredients

Pigment, filler, or aggregate compositions, e.g., stone,...

106416, 106456, 106457, 501145, 501146, 501149, 501150, C04B 1410, C04B 3310

Patent

active

058912363

ABSTRACT:
Materials, such as kaolin clays, which are discolored by the presence of goethite mineral impurities are first heated to convert the goethite to hematite and then treated to remove the hematite, whereby the color and brightness of the product are improved over the starting material.

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