A kind of preparation method of spherical alumina

Abstract

The invention relates to a preparation method of spherical aluminum oxide. The method comprises the following steps: mixing pseudoboehmite powder and a forming aid, adding acid-containing deionized water, kneading, and extruding to obtain a strip plastic; putting the strip plastic in a balling device on the premise of no adhesion of the strip plastic surface to implement strip breaking and rolling granulation, spraying a misty liquid drop wetting agent while keeping the granules rotating, wetting the granule surfaces on the premise of no adhesion of the granules, stopping spraying, continuing rotation until the granules become spherical granules with smooth surfaces, changing cold air in the balling device into hot air, drying to harden the spherical granule surfaces, and stopping the rolling granulation; and drying the spherical granules, and roasting to finally obtain the aluminum oxide spherical carrier. The method solves the problems of unsmooth surface, poor sphericity and poor wear resistance in the balls prepared by the original process, and has the advantages of low preparation cost and no pollution in the preparation process.

Description

technical field [0001] The invention belongs to the field of preparation of inorganic materials, and relates to a preparation method of spherical alumina, more specifically, relates to a kind of alumina precursor which is kneaded, extruded, granulated and pelletized, finally dried and roasted to form a spherical alumina aluminum process. Background technique [0002] Alumina is widely used as a catalyst carrier and adsorbent because of its suitable specific surface area, controllable pore structure, good thermal stability, and strong adsorption capacity. In order to better perform, in addition to requiring better or more suitable carrier physical and chemical indicators (usually referring to specific surface, pore volume, pore size distribution, crushing strength, etc.), engineering applications (mass transfer, heat transfer, wear, etc.) There are also requirements for the shape of the catalyst, and the commonly used shapes are: spherical, ring, sheet, strip (cylindrical, c...

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Problems solved by technology

[0011] To sum up, in the high-speed ball forming device disclosed above, there is no step of rewetting the particle surface and completely drying the ball forming surface, which leads to the surface of the prepared pellets not being smooth enough, and the wet ball is prone to deformation, so the degree of sphericity and poor wear resistance

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