Compositions comprising fine sedimentary kaolin and methods for preparing same
AssigneeImerys Pigments, Inc.
InventorsRobert J. Pruett, Paula R. Alves
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Abstract
Disclosed herein are kaolin compositions, such as beneficiated fine sedimentary kaolin compositions. The beneficiated fine sedimentary kaolins may be obtained from the upper bed of the Rio Capim Kaolin deposit. The compositions may have at least one property chosen from a low iron content and low Hinckley crystallinity index, such as Fe2O3 in an amount less than about 0.8% by weight relative to the total weight of the solids content and wherein the Hinckley crystallinity index of the kaolin is less than about 0.5. Also disclosed are products obtained therefrom, such as paint and paper coating compositions.
Claims21
A composition comprising a beneficiated fine sedimentary kaolin, having a particle size distribution such that at least about 97% of the kaolin has a particle size less than about 1 μm, and wherein the composition containing Fe2O3 in an amount greater than zero but less than about 0.8% by weight relative to the total weight of the solids content, wherein the kaolin exhibits a Hinckley crystallinity index of about 0.5 or less.
A method of refining a kaolin, the method comprising:
- beneficiating fine sedimentary kaolin to form a beneficiated fine sedimentary kaolin containing sedimentary kaolin having a particle size distribution such that at least about 97% of the kaolin has a particle size less than about 1 μm, wherein the kaolin contains Fe2O3 in an amount greater than zero but less than about 0.8% by weight relative to the total weight of the solids content, wherein the kaolin exhibits a Hinckley crystallinity index of about 0.5 or less.
Dependencies are inferred from the claim text.