Porous ceramic carrier for high-temperature and high-pressure inorganic filtering membrane and preparation method for porous ceramic carrier

Abstract

The invention discloses a porous ceramic carrier for a high-temperature and high-pressure inorganic filtering membrane and a preparation method for the porous ceramic carrier. The porous silicon carbide ceramic carrier is prepared by silicon carbide, a binding agent and a pore-forming agent, wherein the mass ratio of the silicon carbide to the binding agent is 80-90:10-20, and the utilization quantity of the pore-forming agent is 35-45% of the sum of the volumes of the silicon carbide, the binding agent and the pore-forming agent. The preparation method includes adding the binding agent and the pore-forming agent in silicon carbide powder; performing ball milling, drying and vacuum heat casting forming; and performing pressureless sintering for a formed blank. Sintering temperature rangesfrom 1250 DEG C to 1350 DEG C, and heat insulation time ranges from 2 hours to 4 hours. As raw materials form main materials by means of fine size grading, the binding agent and the pore-forming agent are added by a special process, technologies such as unique vacuum heat casting forming and the like are adopted, and mechanical strength and porosity of the porous carrier can be improved effectively. The prepared silicon carbide porous ceramic carrier has excellent performances of fine thermal shock resistance, low coefficient of thermal expansion, fine mechanical and chemical stability at high temperature and under high pressure, and the like.

Description

technical field [0001] The invention relates to a porous ceramic carrier for a high-temperature and high-pressure inorganic filter membrane and a preparation method thereof. Background technique [0002] With the emergence of energy problems, the comprehensive and effective utilization of coal has become more and more important. In the utilization of coal, a key problem that needs to be solved is high-temperature filtration and dust removal technology, and high-temperature ceramic filter membranes are considered to be the most effective way to solve this problem. Covering one or more membranes on a porous ceramic carrier forms a so-called ceramic filter membrane tube. Ceramic membrane has outstanding advantages such as high temperature resistance, corrosion resistance, erosion resistance, high mechanical strength, stable structure without deformation, long life, etc., so it is widely accepted and praised as the best choice for hot particle filtration materials. As a new ty...

AI Technical Summary

Problems solved by technology

First of all, during the firing process of extruded products, due to the length, the phenomenon of fracture often occurs, resulting in a very low yield; secondly, because the consistency of the whole body raw materials cannot be guaranteed, even if there is no fracture during the firing of the carrier In this case, the consistency of the overall mechanical strength cannot be guaranteed, and the requirements for long-term use cannot be met.