Aluminum nitride reinforced castable for CDQ coke oven chute column and preparation method thereof

Abstract

The invention relates to an aluminum nitride reinforced pouring material for a chute column of a CDQ coke oven and a preparation method thereof. The technical solution is: 45-65wt% mullite, 15-35wt% silicon carbide, 2-8wt% inorganic-metal composite microcapsules, 4-6wt% α-alumina powder, 2-4wt% Silica powder and 4-6wt% calcium aluminate cement are used as raw materials, and 0.1-0.3wt% catalyst and 0.1-0.3wt% water reducer are used as additives. First mix the inorganic-metal composite microcapsules and the catalyst to obtain a premix; then mix the premix, water reducer and other raw materials, and stir evenly to obtain aluminum nitride reinforced CDQ oven chute castables . The aluminum nitride reinforced castable for CDQ coke oven chute column prepared by the invention has good hydration resistance, high production stability and good fluidity; the use results show that it has excellent mechanical properties at medium and high temperatures, wear resistance and thermal shock Good stability, long life, energy saving and environmental protection.

Description

technical field [0001] The invention belongs to the technical field of aluminum nitride reinforced castables. Specifically, the invention relates to providing an aluminum nitride reinforced castable for a chute column of a dry quenching coke oven and a preparation method thereof. Background technique [0002] The dry coke quenching technology is to place the red coke in a "sealed" container, and pass the circulating N through the bottom. 2 cooling process. Compared with wet coke quenching, dry coke quenching has the advantages of saving energy, reducing waste of water resources, improving coke quality and protecting the environment. not long. Among them, the chute column is the key and complicated part of the CDQ oven. It bears the weight of the upper refractory material and equipment in an inclined and cantilevered manner, and is in the frequent temperature fluctuation of 500-1000°C, and is subjected to high-speed airflow and coke. Powder scoured, easily damaged. Curre...

AI Technical Summary

Problems solved by technology

Compared with wet coke quenching, dry coke quenching has the advantages of saving energy, reducing waste of water resources, improving coke quality and protecting the environment. not long

Among them, the chute column is the key and complicated part of the CDQ oven. It bears the weight of the upper refractory material and equipment in an inclined and cantilevered manner, and is in the frequent temperature fluctuation of 500-1000°C, and is subjected to high-speed airflow and coke. Powder scoured, easy to damage

Currently, mullite silicon carbide bricks are the main refractory materials used for CDQ coke oven chute columns, which are prone to cracking and peeling under harsh working conditions. Premature damage to this part not only increases production costs, but also reduces Service life of CDQ oven

In recent years, amorphous refractory materials have been gradually applied in CDQ coke ovens, but the temperature in CDQ coke ovens does not exceed 1000°C, and ordinary castables are difficult to sinter, with low strength, poor wear resistance and thermal shock resistance

[0003] "A kind of cordierite-mullite-andalusite thermal shock resistant brick" (CN201210520207.2) technology, although the prepared refractory brick has the advantages of low thermal expansion coefficient and good thermal shock resistance, but its strength is low and the Less abrasive and shorter service life

"A silicon carbide brick for CDQ coke oven and its preparation method" (CN103864440A) technology, although the strength and wear resistance have been improved to a certain extent, but the production process is difficult to sinter, easy to oxidize, and the service life is still not ideal

"A high thermal conductivity Sialon-SiC composite ceramic refractory material and its production method for CDQ coke oven" (CN101891487A) technology, the high thermal conductivity and high strength refractory material produced is due to the high nitriding temperature and complicated nitriding process , The production cost is too high, it is difficult to promote the use on a large scale

"Castable for coke ovens with in-situ generation of aluminum nitride and its preparation method" (CN201510614844.X) technology, although this technology has its advantages, but the fluidity of the castable is poor and difficult to form due to the addition of water-repellent agents. production instability