Oil ammonia column shaping method of spherical aluminium oxide

Abstract

A process for preparing spherical alumina by oil-ammonia column includes dripping the alumina sol in the oil-ammonia column composed of upper oil phase and lower electrolyte solution phase to generate spherical gel particles, ageing in electrolyte solution for 0.5-10 hr, drying and calcining. Its advantage is high purity.

Description

technical field [0001] The invention relates to an oily ammonia column forming method for spherical solid particles, specifically, a method for preparing alumina spherical particles by using the oily ammonia column method. Background technique [0002] The oil ammonia column forming method is a common method for preparing alumina, silicon oxide, silicon aluminum and other pellets. It is to drop the sol into the oil ammonia column, so that the sol particles form balls in the oil phase of the upper layer of the column, and gel in the ammonia water of the lower layer. After aging, the gelled particles are dried and calcined to obtain spherical solid particles. The pellets prepared by this method have uniform structure, low wear and high strength, and are widely used as fixed bed and moving bed catalysts, catalyst carriers, and adsorbents. [0003] USP4179408 discloses a method for preparing spherical alumina. In this method, aluminum sol droplets first enter the upper phase o...

AI Technical Summary

Problems solved by technology

However, the introduction of surfactants can easily cause oil-water emulsification, resulting in turbidity of the ammonia-water phase and oil phase, and changes in the properties of the oil phase.

The effect of using anionic surfactant is good, but the metal cations contained in it are easily absorbed by the sol particles and the gel particles contain impurities