Castable for dry quenching coke oven with aluminum nitride formed in situ and preparation method thereof

Abstract

The invention relates to a pouring material for a dry quenching coke oven that generates aluminum nitride in situ and a preparation method thereof. The technical solution is: 45~65wt% mullite, 15~35wt% silicon carbide, 2~8wt% aluminum powder, 0~5wt% aluminum-silicon alloy powder, 0~2wt% elemental silicon powder, 4~6wt% of α-alumina micropowder, 2~4wt% of silica micropowder and 4~6wt% of calcium aluminate cement are used as raw materials, with 0.1~0.3wt% catalyst and 0.2~0.5wt% waterproof Water-reducing agent and 0.1~0.3wt% water-reducing agent are used as additives; then according to the above percentage content, firstly premix aluminum powder, aluminum-silicon alloy powder, catalyst and waterproofing agent to obtain a premix; then premix, The water reducer is mixed with other raw materials and stirred evenly to obtain a castable for dry quenching coke ovens in which aluminum nitride is formed in situ. The pouring material prepared by the invention has excellent mechanical properties at medium and high temperatures, good wear resistance and thermal shock stability, long service life, energy saving and environmental protection; it is suitable for the chute column of a CDQ coke oven.

Description

technical field [0001] The invention belongs to the field of castable technology. In particular, it relates to a casting material for dry quenching coke ovens for generating aluminum nitride in situ 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. long. Among them, the chute column is the key and complicated part in 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. Currently, mullite silicon carbide bricks are the main re...

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. long

Among them, the chute column is the key and complicated part in 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 cordierite-mullite-andalusite thermal shock resistant brick" (CN201210520207.2) patented technology, the prepared refractory brick has the advantages of low thermal expansion coefficient and good thermal shock resistance, but its strength is low and Less abrasive and shorter service life

"A silicon carbide brick for CDQ coke oven and its preparation method" (CN103864440 A) patented technology improves its strength and wear resistance 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) patent technology, the high thermal conductivity and high strength refractory material produced is due to the high nitriding temperature and comparatively high nitriding process. Complexity, high production cost, difficult to promote and use on a large scale