Method for preparing an ultrafine powder

Details Method for preparing an ultrafine powder Method for preparing an ultrafine powder

1996-10-23

1998-11-24

Brunsman, David

Chemistry of inorganic compounds

Oxygen or compound thereof

Metal containing

C01G 102

Patent

active

058402683

ABSTRACT:
A method for preparing an ultrafine powder, which comprises forming a precipitate by reacting a hydroxide type precipitate-forming agent to an aqueous solution containing at least one type of metal ions capable of forming a hydroxide type precipitate which forms a stable floc in the presence of sulfate ions, adding sulfate ions before or after forming the precipitate, to let the formed precipitate form a stable floc, and then dispersing the precipitate in an organic solvent without drying it, followed by drying to obtain independently separated amorphous or crystalline primary particles having an average particle size of at most 0.2 .mu.m.

REFERENCES:
patent: 4140771 (1979-02-01), Berard et al.

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