Low brightness functional pigment from process by-product

Details Low brightness functional pigment from process by-product Low brightness functional pigment from process by-product

1992-04-27

1995-01-31

Lithgow, Thomas M.

Classifying, separating, and assorting solids

Fluid suspension

Liquid

209 5, 209 10, 209 39, 210767, 501148, 501149, 106486, 106487, B03B 104, B03B 562, B03B 700, C09C 124

Patent

active

053852397

ABSTRACT:
A low brightness pigment and method is provided from a heretofore rejected waste kaolin stream. Kaolin processing rejects are high in iron-stained TiO.sub.2. After separating the stained TiO.sub.2 from the high brightness kaolin and concentrating the resulting fraction, the material can be processed to produce a low brightness pigment suitable of many applications where lower brightness is desirable, such as coating paper board without mottling.

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