Method for producing calcined clay pigments

Details Method for producing calcined clay pigments Method for producing calcined clay pigments

1974-05-08

1976-03-02

Rosenberg, Peter D.

Chemistry of inorganic compounds

Silicon or compound thereof

Oxygen containing

106 67, 106288B, 423111, C01B 3324

Patent

active

039418723

ABSTRACT:
Naturally-occurring hydrated kaolin clay is calcined under a reducing atmosphere at a temperature of at least 1400.degree.F., preferably in the range of about 1600.degree.F. to 2100.degree.F., and then the clay is calcined in an oxidizing atmosphere at a temperature of at least 1400.degree.F., preferably in the range of about 1600.degree.F. to 2100.degree.F., to produce a calcined clay pigment product of desired brightness.

REFERENCES:
patent: 1768545 (1930-07-01), Curtis
patent: 2688558 (1954-09-01), Rankine
patent: 2877125 (1959-03-01), Duplin

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