Process for the production of rutile mixed-phase pigments
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United States of America Patent
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Apr 24, 1990
Grant Date -
N/A
app pub date -
Jan 18, 1989
filing date -
Jan 28, 1988
priority date (Note) -
Expired
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Abstract
A process for the production of rutile mixed-phase pigments comprising calcinating of a solid mixture of titanium dioxide or titanium oxide hydroxide with a dye-producing compound of a metal, in one or more directly heated, continuously operated rotary kilns, wherein in terms of material flow, air is introduced into the kiln atmosphere countercurrently to the direction of flow of the solids in the second half of the rotary kiln.
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