Calcium oxide foam ceramic and preparation method thereof

Abstract

The invention relates to calcium oxide foam ceramic and a preparation method thereof. The preparation method thereof is technically characterized by comprising the following steps of mixing 90 to 99.5wt% of calcium hydroxide powder and 0.5 to 10wt% of other hydroxides, so as to obtain mixed powder; adding 0.1 to 3wt% of additive and 30 to 100wt% of water into the mixed powder, and mixing in a wet way, so as to obtain slurry; soaking a polyurethane sponge into the slurry for 2 to 20min, fetching out the polyurethane sponge containing the slurry, and extruding; drying the extruded polyurethane sponge at the temperature of 110 DEG C for 12 to 24h, so as to obtain a prefabricated block of the calcium oxide foam ceramic; finally, putting the prefabricated block of the calcium oxide foam ceramic into a heating furnace, heating to 1400 to 1700 DEG C, insulating heat for 1 to 5h, and naturally cooling, so as to obtain the calcium oxide foam ceramic. The calcium oxide foam ceramic has the advantages that the technology is simple, the cost is low, and the energy consumption is low; the prepared calcium oxide foam ceramic has high use temperature, stable high temperature property and good anti-hydration property, and is suitable for using as a high-temperature material for smelting high-purity melts.

Description

technical field [0001] The invention belongs to the technical field of foam ceramics. In particular, it relates to a calcium oxide foam ceramic and a preparation method thereof. Background technique [0002] High-purity metal materials have excellent performance and special uses, but in the process of melting or continuous casting, due to the contact with the furnace lining material, the purity of the metal melt is inevitably affected, which is specifically manifested in the metal material There are certain oxide or non-oxide inclusions of different shapes, and their quantity, size, shape, type, and distribution all have a destructive effect on the strength, plasticity, and toughness of metal materials, and it is easy to cause pores and slag inclusions in metal products Defects such as cracks and cracks will degrade metal products and even become a hidden danger of safety accidents in severe cases. Therefore, the use of simple and effective purification methods to reduce t...

AI Technical Summary

Problems solved by technology

Traditional filters such as fiber filter mesh, straight hole core ceramic filter and honeycomb filter have problems such as low high temperature strength, low filtration efficiency, low long-term use temperature and low flow rate of metal melt.

[0003] As a calcium oxide filter for metal smelting, there have been research reports and applications. The basic process includes calcium oxide particle preparation, crushing, grading, mixing, molding and firing. The process is cumbersome, especially in the existing technical scheme. The sintered layer on the surface of the treated calcium oxide green body is destroyed during the crushing process, and a new surface is exposed after the crushing, which leads to the easy hydration of calcium oxide particles, which is useful for the storage of calcium oxide raw materials and the preparation of calcium oxide filter materials brought great difficulty