Preparation method of hollow flat plate structure type ceramic filter membrane element

Abstract

The invention provides a preparation method of a hollow flat plate structure type ceramic filter membrane element. The method comprises the following steps: (1) preparing a hollow structure type ceramic membrane supporting body by using an extrusion molding method, namely sintering aluminum hydroxide obtained by calcination at 600 DEG C as a main raw material to prepare the ceramic membrane supporting body; (2) preparing the ceramic filter membrane by using a plasma spray method. When the ceramic membrane supporting body is prepared, the selected and used raw material is calcined aluminum hydroxide, so that the sintering temperature of the ceramic membrane supporting body can be greatly reduced, and the sufficient strength of the supporting body can be guaranteed; when the ceramic filter membrane layer is prepared, the thickness of the filter membrane can be excellently controlled by using the plasma spray process, and the filter resistance is reduced; the membrane layer has the uniform pore size distribution and the high separation accuracy; the membrane layer is closely combined with the supporting body. The ceramic filter membrane is prepared by using plasma spraying without sintering, so that the process is simple, the production cost of the ceramic filter membrane can be effectively reduced, the production efficiency is improved, and the process can be widely applied to the fields of sewage treatment and filtration, solid-liquid chemical separation, and the like.

Description

technical field [0001] The invention relates to a method for preparing a ceramic membrane element for filtering with a hollow flat plate structure, belonging to the fields of sewage treatment filtration and solid-liquid chemical separation. The present invention also relates to the filter ceramic membrane element obtained by the above method. Background technique [0002] In sewage treatment and solid-liquid chemical membrane separation devices, the separation membrane element plays a major role, which is the core of membrane separation technology. Porous inorganic ceramic membrane elements have some advantages that polymer organic separation membranes cannot match, such as high temperature resistance; good chemical stability, acid and alkali resistance and biological corrosion; high mechanical strength, pressure resistance and wear resistance; narrow pore size distribution and high separation accuracy ; It can be cleaned and regenerated repeatedly, and has a long service ...

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Problems solved by technology

[0008] In these patent documents, alumina powder or clay is directly used as raw material in the preparation process of the flat ceramic membrane support body, and the sintering temperature is 1300-1550°C. The sintering temperature is relatively high; in addition, the flat ceramic filter membrane layer described in the patent literature is prepared by ceramic slurry spraying, sol impregnation, pulling and other methods, so that the obtained filter resistance is large, the processing flux is small, and the pore size and distribution are difficult to control, which makes it difficult for flat inorganic ceramic membrane materials to be widely used in the fields of separation, filtration and purification.

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