High alumina castable

Abstract

The invention relates to a high alumina castable. The high alumina castable comprises 60-85% of high alumina bauxite, 1-10% of clay, 1-10% of flint clay, 10-30% of zircon sand and 3-7% of a binder. The high alumina bauxite comprises 30-40% of bauxite with the granularity of 5-3mm, 25-35% of bauxite with the granularity of 3-1mm, 20-30% of bauxite with the granularity of 1-0mm, and 10-20% of bauxite with the granularity of 0.09mm or below. The physical performance indexes of the above fireproof castable lining produced according to above granularities and proportions are as follows: the bending strength is 15.5MPa, the compressive strength is 40.5MPa, the linear change rate is 0.20%, and the bulk density is 2.75g.cm<-3>. Practical use proves that the physical performances of the high alumina castable completely meets use condition requirements of fused aluminum furnace linings, has no cracks, and eliminates the aluminising problem, and the service life of the high alumina castable can reach 5 years or above.

Description

technical field [0001] The invention belongs to the technical field of refractory materials, and in particular relates to a high-alumina casting material. Background technique [0002] In recent years, with the continuous development of refractory materials in my country and the gradual deepening of various researches, the types and quantities of refractory materials have continued to increase, and the quality has greatly improved. In particular, the production of refractory castables has made great progress and development, and has basically been able to meet the needs of metallurgical enterprises. However, for aluminum melting furnaces, although the quantity of refractory castables is large and the quality has been improved, the problem of cracks in the refractory castables used in aluminum melting furnaces during use has not been solved. Once cracks occur, molten aluminum will penetrate into the inner lining, thereby destroying the overall structure of the refractory cas...

AI Technical Summary

Problems solved by technology

However, for aluminum melting furnaces, although the quantity of refractory castables is large and the quality has also improved, the problem of cracks in the refractory castables used in aluminum melting furnaces has not been resolved.

Once cracks occur, molten aluminum will penetrate into the inner lining, thereby destroying the overall structure of the refractory castable, causing damage and peeling, and greatly reducing the service life of the aluminum melting furnace

The study found that the main cause of aluminization is the poor corrosion resistance of the refractory castable lining and insufficient bulk density.