High thermal shock abrasive brick for dry quenched coke oven chute pillar and manufacture method

Abstract

The present invention discloses one kind of abrasive brick with high thermal shock resistance for use in dry quenching coke oven and its making process. The abrasive brick is made with the materials including silicon carbide 62-80 wt%, silicon nitride 17-35 wt%, inorganic adhesive 0.4-3 wt%, lanthanide oxide 0.1-0.8 wt% and ferric oxide impurity less than 1.0 wt%, and has high thermal shock stability and normal temperature pressure strength higher than 120 MPa. The making process includes the steps of mixing all the materials, pressing at 75-125 N / sq mm pressure to form adobe, stoving the adobe at 100-300 deg.c and final sintering in a kiln at 1380-1420 deg.c under the protection of nitrogen. The abrasive brick with high thermal shock resistance has long service life.

Description

technical field [0001] The invention relates to a material for manufacturing a CDQ coke oven chute column used in iron and steel smelting enterprises, in particular to a high thermal shock wear-resistant brick for a CDQ coke oven chute column and a manufacturing method thereof. Background technique [0002] CDQ is a coke quenching method used by iron and steel smelting enterprises to cool red coke with inert gas in CDQ ovens. The method can make full use of the sensible heat of red coke, significantly improve the quality of coke, effectively save energy, greatly reduce the emission of harmful substances, and maintain the atmospheric environment. At present, in the domestic large-scale CDQ system with a processing capacity of more than 120t / h, the restrictive link that affects the production capacity is the damage of the column of the CDQ coke oven chute. Taking the CDQ system of Wuhan Iron and Steel (Group) Company as an example, the coke processin...

AI Technical Summary

Problems solved by technology

[0004] From the physical and chemical indicators in Table 1, it can be seen that the physical properties of the above-mentioned mullite-silicon carbide refractory bricks are poor, especially the most critical physical and chemical indicators such as thermal shock stability, high temperature flexural strength, and normal temperature compressive strength. Adapt to the complex working condition requirements of CDQ coke oven chute column

Due to the heavy load on the upper masonry of the chute column of the CDQ coke oven, it is easy to cause the refractory bricks in this part to break, resulting in cracking of the chute column and shortening the service life, which greatly limits the capacity of the CDQ system.