Foamed ceramics for purifying metal melt and preparation method thereof

Abstract

The invention relates to foamed ceramics for purifying a metal melt and a preparation method thereof. The preparation method has the technical scheme that firstly, 10 to 80 weight percent of calcium hydroxide powder, 10 to 80 weight percent of calcium zirconate powder and 1 to 10 weight percent of zirconium dioxide powder are mixed to obtain mixed powder; then, 0.1 to 3 weight percent of additives of the mixed powder and 30 to 100 weight percent of water are additionally added; wet mixing is performed to obtain slurry; then, polyurethane sponge is soaked into the slurry; repeated extrusion is performed for 2 to 20 min; the polyurethane sponge containing the slurry is taken out and is extruded; drying is performed for 12 to 24h under the condition of 200 to 300 DEG C; a foamed ceramic prefabricated block is obtained; finally, the foamed ceramic prefabricated block is put into a heating furnace; the temperature is raised to 1300 to 1600 DEG C; heat insulation is performed for 1 to 5h; natural cooling is performed; the foamed ceramic for purifying the metal melt is obtained. The preparation method is characterized in that the process is simple; the cost and the energy consumption are low. The prepared foamed ceramic for purifying the metal melt has high use temperature, stable high-temperature performance and good anti-hydration performance, and is applicable to a filtering material for high-purity metal smelting.

Description

technical field [0001] The invention belongs to the technical field of foam ceramics. In particular, it relates to a foam ceramic for purifying molten metal 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, whose quantity, size, shape, type and distribution all have a destructive effect on the strength, plasticity and toughness of metal materials, and easily cause pores and slag inclusions in metal products Defects such as cracks and cracks can cause metal products to be downgraded and even become a hidden danger of safety accidents. Therefore, the use of simple and effective purification methods to reduce the...

AI Technical Summary

Problems solved by technology

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

[0004] 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 calcium oxide body after high temperature treatment is destroyed during the crushing process, and a new surface is exposed after the crushing, which leads to the easy hydration of the calcium oxide particles, which provides the reserve of calcium oxide raw materials and the protection of calcium oxide filter materials. It is very difficult to prepare

[0005] In recent years, foam ceramics have been widely used in the foundry industry, and the research and application of calcium oxide foam ceramics have begun to attract people's attention. However, foam ceramics with high calcium oxide content will face hydration or excessive shrinkage during the preparation process, resulting in shape The problem of deformation has not been applied in large-scale industrialization so far