Self-binding calcium oxide material and preparation method thereof

Abstract

The present invention relates to a self-binding calcium oxide material and a preparation method thereof. The technical scheme comprises: adopting 40-70 wt% of calcium oxide particles, 10-40 wt% of calcium oxide fine powder and 3-20 wt% of nanometer calcium oxide as raw materials, additionally adding 2-10 wt% of dimethicone, stirring for 2-30 min, carrying out press molding, placed the molded billet into a drying container filled with silica gel, naturally drying for 24 h in a closed environment, carrying out a heat treatment for 8-24 h at a temperature of 300-1500 DEG C, naturally cooling, placing into a container filled with dimethicone, carrying out vacuum impregnation for 30 min, and draining to obtain the self-binding calcium oxide material. According to the present invention, the preparation process is simple, and the prepared self-binding calcium oxide material has characteristics of high purity, good chemical stability, good hydration resistance, excellent melt erosion resistance and excellent permeation property, can absorb the inclusion in the melt, and can be used as the lining material of ultra-pure steel or alloy smelting.

Description

technical field [0001] The invention belongs to the technical field of calcium oxide materials. In particular, it relates to a self-combined calcium oxide material and a preparation method thereof. Background technique [0002] When smelting ultra-pure molten steel and alloys, people often hope that the lining material contains free calcium oxide, which has the ability to remove sulfur, phosphorus and adsorbed oxide inclusions in the process of contacting the melt. Among the known refractory oxides, calcium oxide has the best high temperature stability, and it adds little oxygen to the melt. Therefore, calcium oxide is the most ideal refractory component for smelting lining. [0003] However, free calcium oxide is easy to hydrate in the atmosphere and is difficult to store. Therefore, it is very difficult to prepare smelting materials with high calcium oxide content. As far as the working lining of steelmaking is concerned, the current common practice is to directly intro...

AI Technical Summary

Problems solved by technology

The calcium oxide material obtained by this technology reduces the high temperature performance of the calcium oxide material, and also reduces the high temperature stability of the material. For example, adding iron oxide and silicon oxide will lead to an increase in the total oxygen content in the water.