Stress buffering type fire resistive material for dry coke quenching equipment and method for manufacturing same

Abstract

The present invention relates to a stress-buffering refractory material that is used for dry quenching coke equipment, and belongs to the refractory material. The stress-buffering refractory material is prepared by mixing stress-buffering raw materials, waste kiln, sintered or electrically molten mullite, micro Al2O3 powder, clay and dextrin water; wherein, the stress-buffering raw materials is molded through extrusion after andalusite, fused silica, the micro Al2O3 powder and the clay are mixed well, and is prepared after high-temperature sintering at temperature between 1400 DEG C and 1650 DEG C; the refractory material can buffer the stress produced by sudden cooling and sudden heating when in use; the thermal shock stability, high-temperature rupture strength, wear resistance and service life are greatly improved. Compared with the existing refractory material that is used for the dry quenching coke equipment, the thermal shock resistance is improved by 20 to 40 percent; the mechanical properties are improved by 10 to 20 percent; the erosion resistance is improved by 30 to 50 percent; the wear resistance is improved by 15 to 35 percent and the service life is improved by more than 50 percent.

Description

technical field [0001] The invention belongs to the field of refractory materials, in particular to a stress-buffering refractory material for coke dry quenching equipment, and also provides a manufacturing method for the refractory material. Background technique [0002] During the use of CDQ equipment, refractory materials are often subject to sharp changes in ambient temperature, which will cause certain internal stress damage to refractory materials. At present, the refractory materials used in domestic CDQ equipment are mainly based on metallic silicon, mullite, silicon carbide, α-Al 2 o 3 It is made of clay as raw material, pressed by a high-tonnage press, and fired at 1400-1600°C. The Achilles' heel of this refractory material is: metal silicon will continue to oxidize during firing and use, and SiO will be formed on the surface of the refractory material. 2 , and SiO 2 Most of them are cristobalite that is easy to expand, so a permanent tension is formed on the s...

AI Technical Summary

Problems solved by technology

The Achilles' heel of this refractory material is: metal silicon will continue to oxidize during firing and use, and SiO will be formed on the surface of the refractory material. 2 , and SiO 2 Most of them are cristobalite that is easy to expand, so a permanent tension is formed on the surface of the refractory material, which leads to the formation of stress inside and outside the refractory material

With the continuous thickening of the oxide layer, the permanent surface tension increases, and the stress of the refractory material increases. When the stress is greater than the bonding strength of the refractory material, the refractory material begins to crack or even break, which affects the service life of the refractory material.