Process for bleaching kaolin

Details Process for bleaching kaolin Process for bleaching kaolin

1976-05-13

1977-01-11

Garvin, Patrick P.

Compositions: coating or plastic

Materials or ingredients

106 72, 106309, C04B 3304, C04B 3313

Patent

active

040024873

ABSTRACT:
In a process for treating raw kaolin clay to improve the color and brightness by treating the clay in an aqueous dispersion with sodium dithionite, the improvement consisting of treating the dispersion with hydroxylamine or salt thereof after the treatment with sodium dithionite is complete.

REFERENCES:
patent: 3309211 (1967-03-01), Weiss et al.
patent: 3398008 (1968-08-01), Jacobs et al.
patent: 3861934 (1975-01-01), Mallary et al.

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