Manufacture of spherical alumina from gibbsite

Details Manufacture of spherical alumina from gibbsite Manufacture of spherical alumina from gibbsite

1981-04-09

1983-08-16

Carter, Herbert T.

Chemistry of inorganic compounds

Oxygen or compound thereof

Metal containing

423628, 423631, 252448, C01F 702

Patent

active

043991190

ABSTRACT:
A method of manufacturing spherical alumina particles which comprises the steps of digesting, at an elevated temperature and an elevated pressure, gibbsite with an aqueous hydrochloric acid solution and then forming an aqueous basic aluminum chloride solution; adding, at an elevated temperature, an aqueous ammonia to said aqueous basic aluminum chloride solution to form an alumina hydrosol containing ammonium chloride; commingling said alumina hydrosol with a gelling agent; thereafter dispersing droplets of said mixture in a suspending medium under conditions effective to transform said droplets into hydrogel particles; ageing said hydrogel particles first in said suspending medium and then in aqueous ammonia; and then washing said hydrogel particles with water, drying and calcining to obtain spherical alumina particles.

REFERENCES:
patent: 3202480 (1965-08-01), Nixon
patent: 4032472 (1977-06-01), McCallister
patent: 4216122 (1980-08-01), Michalko
patent: 4250058 (1981-02-01), Michalko
patent: 4301033 (1981-11-01), Takumi et al.

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