Method for improving brightness of kaolinite clays including iro

Details Method for improving brightness of kaolinite clays including iro Method for improving brightness of kaolinite clays including iro

1974-12-09

1976-06-08

Satterfield, Walter R.

Compositions: coating or plastic

Coating or plastic compositions

Metal-depositing composition or substrate-sensitizing...

75 1R, 423113, 423131, 423132, C04B 3313

Patent

active

039619710

ABSTRACT:
A method for preparing a coating grade kaolin clay from a crude clay including discoloring iron contaminants in the form of iron pyrites. The clay is roasted in an oxidizing atmosphere to convert at least a portion of the sulfurous contaminants to a form exhibiting increased magnetic susceptibility and increased solubility in chemical leachants. Thereafter, the clay is formed into an aqueous slurry and subjected to a magnetic field to remove at least part of the converted components, and then subjected to conventional leaching and filtering operations.

REFERENCES:
patent: 2955051 (1960-10-01), Maloney
patent: 3309214 (1967-03-01), Podschus et al.
patent: 3316334 (1967-04-01), Walen et al.
patent: 3482685 (1969-12-01), Malden et al.
patent: 3853983 (1974-12-01), Abercrombie et al.
patent: 3853984 (1974-12-01), Price et al.
patent: 3860514 (1975-01-01), Lee et al.

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