Lightweight bauxite refractory aggregate containing micro-closed pores and preparation method thereof

Abstract

The invention relates to a lightweight bauxite refractory aggregate containing micro-closed pores and a preparation method thereof. The technical solution is: put the lumpy bauxite raw meal in a microwave device, and heat up at a heating rate of 20-100°C / min. When the temperature of the microwave device rises to 350°C, 450°C, 550°C, 650 ℃ and 950 ℃, keep warm for 5 to 30 minutes each, and naturally cool to room temperature to obtain a pre-fired billet. Then the pre-fired billet is transferred into a high-temperature kiln, and the temperature is raised at a heating rate of 3-10°C / min. At ~1650°C, keep warm for 1 to 4 hours each to obtain a lightweight bauxite refractory aggregate with slightly closed pores. The invention has simple process and low cost, and the prepared lightweight bauxite refractory aggregate containing micro-closed pores has the characteristics of low apparent porosity, high closed porosity, small pore diameter and high-temperature medium erosion resistance.

Description

technical field [0001] The invention belongs to the technical field of refractory materials. In particular, it relates to a light-weight alumina refractory aggregate containing micro-closed pores and a preparation method thereof. Background technique [0002] Refractory materials are directly used in high-temperature industrial production processes in various fields of the national economy such as steel, nonferrous metals, cement, glass, ceramics, chemicals, machinery and electric power, and are essential basic materials to ensure the operation and technological development of the above industries. China is currently the world's second largest energy producer and consumer. The "12th Five-Year Plan for Energy Conservation and Emission Reduction" clearly states that energy-saving transformation of industrial kilns should be vigorously promoted. The research and development of high-temperature lightweight refractory materials can greatly reduce the energy consumption of indust...

AI Technical Summary

Problems solved by technology

However, with the above preparation methods, the raw materials are ground and reshaped. On the one hand, the process is more complicated. More importantly, the prepared refractory aggregate usually has a high apparent porosity and a large pore size, and cannot resist slag during use. And the erosion and penetration of high temperature medium

[0005] "A microporous lightweight bauxite refractory aggregate and its preparation method" (ZL 201410447797.X) patent technology, a microporous lightweight bauxite refractory aggregate was prepared by a wet method. Although the prepared product has relatively Low apparent porosity and pore size, but the wet preparation process used is relatively complicated, and it is difficult to realize industrial production