Lightweight insulation refractory castable

Abstract

The invention relates to a light-weight heat-insulation refractory castable which is prepared from the following raw materials in parts by weight: 10-20 parts of fly ash, 20-30 parts of mullite, 10-20 parts of aluminum oxide hollow sphere, 30-40 parts of aluminum oxide micropowder and 20-30 parts of magnesium carbonate. The mullite and aluminum oxide hollow sphere are used as aggregate, and the fly ash, aluminum oxide micropowder and magnesium carbonate are used as the matrix.

Description

Technical field [0001] The invention belongs to the technical field of refractory materials, and particularly relates to a lightweight heat-insulating refractory castable. Background technique [0002] Compared with qualitative refractory products, unshaped refractory materials represented by refractory castables have the advantages of short process flow, low production energy consumption and cost, convenient use, wide application range, integrity and good use effect, and so on. The interior has been developed rapidly, and its proportion in the entire refractory material is getting higher and higher. In some countries with advanced refractory technology, the output of unshaped refractories has approached or even exceeded the output of shaped products. For example, the current output of monolithic refractories in Japan accounts for about 60% of the total refractory materials; about 50% in the United States; and 40% to 50% in countries such as Britain, Germany, and France. Nowada...

AI Technical Summary

Problems solved by technology

The problems of the existing method for preparing lightweight heat-insulating refractory castables are: first, the porosity is not high, and the main source of pores in refractory castables is lightweight aggregate, and the porosity of prepared lightweight castables is generally lower than that of light-weight castables. The porosity of the aggregate, so that the high porosity of the lightweight castable cannot be achieved; the second is that the porosity of the castable is high but the pore size is large. For porous materials, the smaller the pore diameter, the higher the strength of the lightweight material , the thermal conductivity is low, because the number of pores in the material with small pore diameter is large, which helps to reduce heat convection and radiation at high temperature and thus reduces the thermal conductivity of the castable