PRODUCTION OF SPHERICAL SILICA - NIPPON STEEL CHEMICAL CO

Title:

PRODUCTION OF SPHERICAL SILICA

Document Type and Number:

Japanese Patent JPH01234319

Kind Code:

A

Abstract:

PURPOSE: To obtain spherical silica giving a compsn. having excellent flowability and burr property, by concentrating a sol contg. specified monodisperse spherical silica particles, by spray-granulating and by calcining the obtd. spherical particles.

CONSTITUTION: The sol contg. the monodisperse spherical silica particles having 0.1W2.0μ mean particle diameter, obtd. by hydrolyzing tetraalkoxysilane in all aq. ammonium soln. is concd. to 20W50wt.% solid content. Then, by spray- granulating the sol with a spray dryer, the spherical particles having 5W40μ mean particle diameter is obtd. and the targeted spherical silica is obtd. by calcining the particles. As the tetraalkoxysilane to be used, silane having C1-4 alkoxy group is pref., and tetramethoxysilane and tetraethoxysilane are desirable for the production of spherical silica having high purity.

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Inventors:

NAKAMURA KUNIHIKO
FURUKAWA MASAYA
KON YOJIRO

Application Number:

JP6058288A

Publication Date:

September 19, 1989

Filing Date:

March 16, 1988

Export Citation:

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Assignee:

NIPPON STEEL CHEMICAL CO

International Classes:

C01B33/18; (IPC1-7): C01B33/18

Attorney, Agent or Firm:

Eiichi Sano

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