Preparation method of ceramic membrane supporting body

Abstract

The invention discloses a preparation method of a ceramic filtering membrane supporting body. The method comprises the steps of (1) preparing a raw material, wherein the raw material comprises mixing powder, namely alpha aluminium oxide powder (1) the purity of which is greater than or equal to 99.7% and alpha aluminium oxide powder (2) the purity of which is greater than or equal to 99.8%, the median particle diameter D50 of the alpha aluminium oxide powder (1) is 18-35mum, the median particle diameter D50 of the alpha aluminium oxide powder (2) is 0.8-2mum, and the dosage of the alpha aluminium oxide powder (2) is 2%-10% (weight) of that of the alpha aluminium oxide powder (1); (2), mixing the mixing powder with a water solution of cross-linking agent acrylamide and methylene double crylic acid ammonium to form a suspension, and carrying out gel casting on the suspension; heating a formed product to 40-55 DEG C in a microwave manner, drying for 1-3 hours, calcining the dried formed product for 4-8 hours under 500-800 DEG C in air atmosphere, placing a calcined product in vacuum or atmospheric hydrogen or argon atmosphere, carrying out heat preservation on the calcined product for 4-12 hours under the condition of 1800 DEG C-1950 DEG C so as to form a supporting body of a pure alpha phase aluminum oxide ceramic filtering membrane. The preparation method provided by the invention has the advantages that the porosity of a product is high, the flux is high, and the product is strong-acid-resisting and strong-alkali-corrosion-resisting.

Description

technical field [0001] The invention relates to a preparation method of a ceramic membrane filter support body, belonging to the field of porous ceramic preparation. Background technique [0002] In the field of membrane separation, inorganic membranes are widely used in microfiltration and ultrafiltration of liquid media and gas separation. [0003] The inorganic membrane made of depositing inorganic materials on the support body can be used for filtration and separation applications in the environmental industry, metallurgical industry, food and beverage industry, biological industry, chemical industry, and petrochemical industry. Specific examples include the separation of oil-water mixtures, the separation of solutions and residues in hydrometallurgy, the filtration of wine and fruit juices, and the filtration of bacteria and viruses from liquids. [0004] In the preparation technology of the existing ceramic filter membrane support body, in order to obtain a sufficient...

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to improve the production technology of the existing ceramic filter membrane support body, which has a long production cycle; the low content of the support body α-phase alumina makes it unable to withstand strong acid and strong alkali corrosion; the support body gap is blocked by fine powder to cause pores In order to solve the problems of low efficiency and low flux, it provides a method that adopts gel injection molding, microwave drying, and a small amount of α-phase alumina is evaporated at high temperature under the protection of the atmosphere-condensed on the α-phase alumina aggregate to form a connecting neck. A method for preparing a ceramic filter membrane support body with short production cycle, high throughput, high strength, corrosion resistance to concentrated strong acid and strong alkali, used for filtering and removing impurities from strong acid solution in hydrometallurgy, and purifying metal by electrolysis process for non-ferrous metals Filtration and impurity removal of strong acid electrolyte and other filtration operations in various strong corrosive environments