Process for the manufacture of spherical alumina-containing particles
First Claim
1. A process for the preparation of alumina-containing particles, comprising the steps of:
- a. mixing an aluminum oxide hydrosol containing a hydrate of alumina or activated alumina and an additive component of wood flour, starch, carbon black or carbon powder with a solution of a hydrolyzable base to form a mixture;
b. introducing said mixture in dispersed form into a water-immiscible liquid having a temperature of from about 60°
to 100°
C., whereby gel particles are formed;
c. aging said gel particles in said liquid at said temperature and subsequently in an aqueous ammonia solution;
d. recovering said aged particles; and
e. drying and calcining said recovered particles.
0 Assignments
0 Petitions
Accused Products
Abstract
Disclosed is process for the preparation of alumina-containing particles, comprising the steps of (a) mixing an aluminum oxide hydrosol containing a hydrate of alumina or activated alumina and an additive component selected from a high molecular weight natural organic material which is insoluble in aqueous solution up to a temperature of 50° C. and carbon with a solution of hydrolyzable base to form a mixture; (b) introducing the mixture in dispersed form into a water-immiscible liquid having a temperature of from about 60 to 100° C., whereby gel particles are formed; (c) aging the gel particles in the liquid at the temperature and subsequently in an aqueous ammonia solution; (d) recovering the aged particles; and (e) calcining the recovered particles.
-
Citations
19 Claims
-
1. A process for the preparation of alumina-containing particles, comprising the steps of:
-
a. mixing an aluminum oxide hydrosol containing a hydrate of alumina or activated alumina and an additive component of wood flour, starch, carbon black or carbon powder with a solution of a hydrolyzable base to form a mixture; b. introducing said mixture in dispersed form into a water-immiscible liquid having a temperature of from about 60°
to 100°
C., whereby gel particles are formed;c. aging said gel particles in said liquid at said temperature and subsequently in an aqueous ammonia solution; d. recovering said aged particles; and e. drying and calcining said recovered particles. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
-
Specification