Ceramic particle, and filtering element and preparation method thereof

Abstract

The invention discloses a ceramic particle, and a filtering element and a preparation method thereof, wherein the ceramic particle is prepared by the following steps: mixing kaolin, talc, bauxite andspodumene, carrying out dry-method powder preparation, carrying out roll forming, and firing to obtain spherical particles. According to the invention, the spherical particles are uniform in particlesize, smooth in surface and high in compressive strength, and the prepared filtering element is uniform in pore size, low in filtering resistance and capable of improving the filtering performance.

Description

technical field [0001] The invention relates to the field of ceramic filter materials among inorganic non-metallic materials, in particular to a ceramic particle, a filter element and a preparation method of the filter element. Background technique [0002] Ceramic filter materials have the advantages of high temperature resistance and good thermal stability, and can be widely used as hot gas purification materials, catalyst carriers, etc. In particular, the cordierite high-temperature ceramic filter material has the advantages of light weight and small thermal expansion coefficient, and is an excellent hot gas purification material; [0003] The traditional cordierite ceramic filter material is mainly prepared by two methods. One is to use clay and talc as the main raw materials, and by adding a part of cordierite clinker, it is formed by extrusion process and fired at high temperature to make a kind with relatively Small pore size cordierite ceramic filter element; [00...

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Problems solved by technology

The ceramic filter element prepared by this process has irregular shape and poor surface smoothness of the cordierite aggregate synthesized at high temperature. The uniformity of the pore size is poor, the porosity is low, and the air permeability resistance is large; even if the cordierite is crushed into nearly spherical particles, the uniformity of the particle size is improved, but it is still poor, and the surface of the particles is not smooth enough due to the crushing effect, which will also increase filtration. Resistance, not well applied to high temperature gas purification;

[0005] Both of the above two preparation methods, due to the poor shape of the aggregate particles constituting the micropores, the poor particle size distribution, and the poor compressive strength of the aggregate particles, make the pore size small or very uneven, resulting in air resistance during filtration. larger;

[0006] In addition, in the preparation of existing porous ceramics, the general cordierite green body formula is mainly composed of magnesium-aluminum-silicon system, and the crystal phase structure in the synthesized product is mainly cordierite, followed by a small amount of cristobalite and spinel phases. In particular, the presence of cristobalite phase will increase the thermal expansion coefficient of the product, reduce thermal stability, and cannot be well adapted to the purification of high-temperature gases.

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