Low-cost, low-density and high-CaO corundum castable and preparation method thereof

Abstract

The invention relates to a low-cost, low-density and high-CaO corundum castable and a preparation method thereof. The low-cost, low-density and high-CaO corundum castable is prepared by adding industrial alumina powder on the basis of the conventional common corundum castable. Volume expansion caused by calcium hexaluminate generated in the corundum castable is compensated by using volume contraction caused by phase change of industrial alumina at a high temperature, so that the contradiction between the adding amount of cement and the volume stability of the castable is solved successfully. The invented castable has low volume density and low thermal conductivity coefficient, energy loss caused by the application of the castable to a high-temperature kiln can be reduced, and the aim of saving energy is fulfilled. The industrial alumina powder is added, so that the cost of the castable is reduced in a certain degree, and the competitive advantage of the castable is enhanced. The corundum castable prepared with the method can be widely applied in the high-temperature industrial fields of steel and iron, non-ferrous metals, ceramics, petrifaction, and the like.

Description

technical field [0001] The invention belongs to the technical field of inorganic non-metallic materials. In particular, it relates to a low-cost, low-density, high-CaO corundum castable and a preparation method thereof. Background technique [0002] Compared with shaped refractory products, unshaped refractory materials have developed rapidly in all countries in the world because of their advantages in production, labor productivity, construction efficiency, material consumption, and energy saving. Castables, one of the main varieties of unshaped refractory materials, are increasingly used in high-temperature parts instead of shaped products. The high-purity corundum castable is made of corundum as the main crystal phase, combined with calcium aluminate cement and alumina micropowder, and its composition is Al 2 o 3 -CaO binary system, the temperature of the liquid phase is as high as 1900 ℃. During the first heat treatment or use, as the temperature rises, the CaO in th...

AI Technical Summary

Problems solved by technology

[0005] 2. When the corundum castable is not eroded by slag and other media, the existing high-purity corundum castable is not conducive to energy saving due to its high density and high thermal conductivity, and it is easy to cause energy waste

[0006] 3. High-purity corundum castables use fused white corundum and / or tabular corundum as the main raw materials, and use alumina micropowder and pure calcium aluminate cement to combine. The raw materials used are all synthetic raw materials, which makes their cost higher. Limiting its large-scale promotion and application