Mullite ceramic hollow fiber membrane and preparation method for same

Abstract

The invention discloses a mullite ceramic hollow fiber membrane and a preparation method for the same. The preparation method comprises the following steps of adding ceramic powder into a polymer solution prepared from an organic polymer, an additive and a solvent to prepare membrane casting slurry; performing stirring to obtain uniformly-dispersed membrane casting slurry; adding the membrane casting slurry into a slurry tank on a spinning device, performing vacuumizing, introducing core liquid, applying nitrogen pressure to extrude the vacuumized membrane casting slurry into a spinneret, immersing a wet fiber membrane extruded from the spinneret in an external coagulating bath through a 0 to 20cm dry spinning path, performing gelation solidification to form a ceramic hollow fiber membrane green body, naturally drying the green body, and placing the green body in a high-temperature furnace; raising the temperature to 700 DEG C to remove the organic polymer, raising the temperature to 800 to 1,600 DEG C for sintering, reducing the temperature to 500 DEG C, and then performing natural cooling. A prepared mullite ceramic hollow fiber membrane finished product is strong in strength, high in porosity, large in water flux, environmentally friendly and low in cost, can be directly used as a basement membrane of a micro-filtration or ultra-filtration membrane or a carrier of a catalyst in a membrane reactor, and can be industrialized on large-scale.

Description

technical field [0001] The invention relates to the field of inorganic membrane preparation, in particular to a mullite ceramic hollow fiber membrane and a preparation method thereof. Background technique [0002] Ceramic membrane is a selective separation membrane made of ceramic materials. It has the advantages of good chemical stability, anti-biological pollution, high temperature resistance, high separation efficiency, easy regeneration, and long service life. It has been widely used in environmental fields, pharmaceutical engineering, biological engineering, chemical industry, textile printing and dyeing industry. At present, the commercialized ceramic membranes are mainly tubular and multi-channel configuration membranes, which have the advantages of convenient installation, easy maintenance and high filtration efficiency, but such ceramic membranes are usually coated with single-layer or multi-layer membrane materials. An asymmetric structure formed on a support. Ea...

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Problems solved by technology

Commercial porous ceramic membranes are mostly made of alumina (α-Al 2 o 3 ≥99wt.%) is the main raw material, the cost of raw materials is high, and the sintering temperature is high, which leads to high preparation costs of these ceramic membranes

On the other hand, the strength of the oxide membrane is not high under high porosity. For the high-throughput ceramic hollow fiber membrane, the main problem at present is the poor mechanical strength (Smidetal, J.Membr.Sci.1996, 112 , 85; Sunetal, J. Membr. Sci. 2006, 278, 162)

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