Method for preparing composite metal oxide hollow fibre

A method for preparing composite metal oxide hollow fibers, specifically a method for obtaining composite metal oxide hollow fibers from the raw chemicals for composite metal oxides by means of directly performing phase inversion and a thermal processing step, wherein the method comprises the following steps:

• raw chemicals for composite metal oxides and a polymer binding agent are added to an organic solvent, and mixed mechanically to obtain an evenly dispersed spinning solution;
• the spinning solution undergoes a defoaming treatment, the spinning solution is extruded through a spinneret and filling liquid from the spinneret passes through a dry air gap into an external coagulation bath and then is solidified to form composite metal oxide hollow fiber precursors;
• the precursors are immersed in the external coagulation bath to displace the organic solvent;
• after natural drying, the precursors are placed in a high temperature furnace for sintering, wherein polymer burn-off, in situ reaction (i.e., solid phase reaction) and in situ sintering processes occur to obtain the composite metal oxide hollow fibers;
• wherein the raw chemicals for composite metal oxides are a mixture of two or more of carbonates or metal oxides, do not chemically react with the filling liquid or the coagulation bath, and have a particle size of 0.1 to 20 μm.