Method of treating silica fumes for whitening purposes

Details Method of treating silica fumes for whitening purposes Method of treating silica fumes for whitening purposes

1991-12-17

1994-03-01

Chaudhuri, Olik

Chemistry of inorganic compounds

Silicon or compound thereof

Oxygen containing

422139, 423335, C01B 3312

Patent

active

052905292

ABSTRACT:
The black powder to be treated is injected into the bottom portion of a heated dense fluidized bed, said bed having effective depth enabling the carbon the particles of silica to be oxidized into carbon dioxide as the particles go through the dense fluidized bed while being entrained by the fluidization air. The whitened powder is then recovered by filtering the gases leaving said dense fluidized bed. The invention is particularly applicable to the cosmetics industry for producing make-up that uses silica powder.

REFERENCES:
patent: 4554147 (1985-11-01), Stoll et al.
Perry's Chemical Engineers' Handbook (6th Ed.), McGraw-Hill, N.Y. 1984, pp. 20-58 to 20-69.

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