KR850006169A - Porous ceramic filter medium and method of manufacturing the filter medium - Google Patents

Abstract

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Description

Porous ceramic filter medium and method of manufacturing the filter medium

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1 is a 12.8-fold micrograph of a filter body consisting of a molten alumina construct having a diameter of 2-5 mm and a 30% magnesia silicate reacted at 1650 ° C. FIG. 2 is a micrograph of the picture of FIG. 1 magnified 32 times. FIG. 3 is a micrograph of the photograph of FIG. 2 enlarged by 160 times.

Claims (10)

In the porous ceramic filter for filtration of iron and iron alloys having a temperature resistance of 1600 ° C., the coefficient of thermal expansion of the filter medium is 3 × 10 ⁻⁶ to 7 × 10 ⁻⁷ / ° C., and there is no macroscopic change in the homogeneous structure. Porous ceramic filter, characterized in that composed of at least one constituent refractory particles and other refractory material uniformly distributed, the spherical body is bonded by a chemical reaction at a high temperature. The ceramic filter media of claim 1, wherein the spheres have at least one space. Ceramic filter medium according to claim 1, wherein the porosity is 25-55% and the globular particle size is 0.2-8 mm, in particular 0.5-5 mm. The refractory material according to claim 3, wherein the refractory material is composed of one of oxides of magnesium, aluminum, chromium and zirconium, corundum, zirconium corundum, spinel, mullite, enosite or celcian and the binding material is magnesium, calcium, barium , Ceramic filter bar as composed of one of oxides, magnesium or calcium silicates of aluminium, silicium, titanium and zirconium. The ceramic filter body according to Claims 1-4, wherein the temporary binder has a small amount or a real mass of a glass seal phase and contains zirconium silicate or zirconia as a refractory substance or a binder substance. In the method for producing a porous ceramic filter body according to claim 1, the refractory material of the spherical body is mixed with the powdery binder and formed into a porous body and temperature-treated to maintain a macroscopic homogeneous structure and to form a spherical body under the formation of a new refractory mixture. Method for producing a porous ceramic filter, characterized in that the chemical reaction with a filter medium that does not shrink in the contact area. The method according to claim 6, wherein the temperature treatment is carried out at 1400 | 1700 ° C., in particular 1500-1600 ° C. and the duration is 15-120 minutes at the maximum temperature. The method according to claim 6 or 7, wherein hollow corundum spherical bodies and magnesium silicates are used as reactants and the weight ratio thereof is 55: 45-80: 20, in particular 60: 40-75: 25. The method according to claim 6 or 7, wherein hollow corundum spherical bodies and wollastonite are used as reactants and the weight ratio thereof is 90: 10-70: 30, in particular 85: 15-75: 25. The method according to claim 6 or 7, wherein zirconium-corundum and magnesium silicate are used as the reactants and the weight ratio thereof is 50: 50-85: 15, in particular 65: 35-75: 25. ※ Note: The disclosure is based on the initial application.