Production of annealed pigments

Details Production of annealed pigments Production of annealed pigments

1974-04-04

1976-04-13

Douglas, Winston A.

Compositions: coating or plastic

Materials or ingredients

Miscellaneous

432 13, 34 31, C09C 300

Patent

active

039501833

ABSTRACT:
In the production of annealed products such as inorganic pigments wherein pigment-forming starting materials are mixed, optionally with the addition of auxiliary substances, thereafter annealed, optionally ground, washed and then dried, the improvement which comprises adding water to the mixture of pigment-forming materials to form an aqueous suspension containing at least about 10% by weight of H.sub.2 O, and applying said suspension to the surface of a hearth which has been heated to at least about 500.degree.C, thereby to heat said materials and to effect annealing. Advantageously the hearth is a horizontal, flat ring rotating about its center and in the course of one rotation of the ring the applied material is heated to the temperature of formation of the desired annealed product, calcined and removed from the surface of the ring before the one rotation has been completed.

REFERENCES:
patent: 3333344 (1967-08-01), Loewen
patent: 3801262 (1974-04-01), Karkowski

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