LOW BRIGHTNESS FUNCTIONAL PIGMENT FROM PROCESS BY-PRODUCT

摘要

A low brightness pigment and method is provided from a heretofore rejected waste kaolin stream. Kaolin processing rejects are high in iron-stained TiO2. After separating the stained TiO2 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.