Method for brightening and whitening clays utilizing sodium boro

Details Method for brightening and whitening clays utilizing sodium boro Method for brightening and whitening clays utilizing sodium boro

1974-06-11

1976-02-10

Satterfield, Walter R.

Compositions: coating or plastic

Coating or plastic compositions

Metal-depositing composition or substrate-sensitizing...

106288B, 252186, 252188, 423111, 423130, C04B 3313, C01F 100

Patent

active

039376320

ABSTRACT:
A method for improving the brightness and whiteness of kaolin clays or the like. An aqueous slurry of the clay is initially treated with a solution of sodium borohydride and sodium hydroxide at a pH of above 7.0 up to about 10.0. Sulphur dioxide is then bubbled through the slurry or otherwise brought into contact with same, the pH being permitted to attain a value of between 6.0 and 7.0. The pH may thereupon be adjusted to between 2.5 and 4.0 with an acid, at which pH the leach reaction may occur; or the application of gaseous sulphur dioxide may be continued to yield a pH of the indicated 2.5 to 4.0 range.

REFERENCES:
patent: 2339594 (1944-01-01), Williams
patent: 2920832 (1960-01-01), Duke
patent: 3193344 (1965-07-01), Iannicelli et al.
patent: 3290161 (1966-12-01), Sheldon et al.
patent: 3353668 (1967-11-01), Duke
patent: 3666513 (1972-05-01), Malden

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