Desulphurizing and dust-removing integral gradient porous ceramic filter element preparing method

Abstract

The invention provides a preparation process for a desulfurization and dust removal integration gradient hole ceramics filter unit, comprising batching, moulding and sintering, and being characterized in that: the gradient hole ceramics filter unit has inner and outer layers, wherein the fine material of inner layer is composed of SiC with granularity between 80 to 150 mu m, high temperature anchoring agent, forming anchoring agent, hole-increasing agent and water, and that of outer layer comprises desulfurizer except the compositions of inner layer and the SiC granularity of outer layer is 20-70 mu m less than that of inner layer. When moulding, the fine material of inner layer is loaded into the die after sieved, isostatic pressing at the pressure of 100-200MPa, then the fine material of outer layer is loaded, isostatic pressing at the pressure of 130-250MPa, and the rough is prepared. The rough is dried at room temperature and then send to high-temperature furnace to get the desulfurization and dust removal integration gradient hole ceramics filter unit with the temperature rising to 1150-1250 degree C and holding 1-3h. The invention uses the isostatic pressing technology, has a simple process, a short production cycle, a controlled aperture and an excellent property.

Description

Technical field [0001] The invention provides a preparation method of a desulfurization and dust removal integrated gradient hole ceramic filter element, which belongs to the technical field of preparation of porous ceramics. Background technique [0002] Porous ceramics are a kind of pore functional ceramics, which contain a large number of openings through pores, so they have the characteristics of huge porosity, pore surface area, adjustable pore shape, distribution and connection of pores in three-dimensional space. Therefore, the method of using porous ceramics to remove particulate impurities and harmful and toxic substances is becoming more and more widely used. my country started relatively late in this field. The preparation process and application of porous ceramics are only in the trial production or trial stage. Only domestic drinking water purifiers composed of ceramic filter elements have been put into mass production, and there is no hot gas for IGCC power pla...

AI Technical Summary

Problems solved by technology

At present, there are technical reports about making porous ceramics, such as: 1. The patent No. 03112045.8 "Preparation method of gradient hole ceramic filter element" adopts isostatic pressing method to prepare gradient hole ceramic filter element, which has high temperature dust removal effect. The disadvantage is Its ceramic filter element does not have desulfurization effect, and in order to facilitate the release of the mold layer, the aggregate used must be fully mixed in the sol, and then sprayed and granulated to improve the fluidity of the aggregate and complicate the preparation process; 2. Patent No. 200410023972.9 "High-temperature ceramic filter element for hot gas purification and its preparation method" has the disadvantage that the ceramic filter element does not have desulfurization effect; 3. The patent number 200310114505.2 "Preparation process of ceramic filter element with desulfurization effect" adopts the grouting method Prepare the ceramic element, and then coat the zinc ferrite sol on the ceramic filter element. The disadvantage is that the gypsum mold is used for molding. Affected by the water diversion of gypsum, the tube wall of the element is thin, resulting in low strength of the ceramic element; affected by the syneresis of the slurry The impact of the influence of the ceramic element tube length; the desulfurization agent is zinc ferrite, which is coated on the surface of the ceramic element in the form of sol, the content of the desulfurizer is small, and the amount of desulfurization is limited