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Coke dry quenching furnace castable used for in-suit generation of aluminium nitride, and preparation method thereof

A CDQ, in-situ generation technology, applied in the field of castables, can solve the problems of low strength, poor wear resistance, short service life, etc., and achieve good wear resistance and thermal shock stability, medium and high temperature Excellent mechanical properties and the effect of improving the mechanical properties at medium and high temperature

Active Publication Date: 2016-01-13
WUHAN UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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" (CN103864440A) patented technology has improved 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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A castable for dry quenching coke ovens that generates aluminum nitride in situ and a preparation method thereof. With 60~65wt% mullite, 15~20wt% silicon carbide, 5~8wt% aluminum powder, 4~6wt% α-alumina micropowder, 2~4wt% silicon micropowder and 4~6wt% Calcium aluminate cement is used as raw material, and 0.1-0.3wt% of catalyst, 0.2-0.5wt% of water-proofing agent and 0.1-0.3wt% of water-reducing agent are used as additives. According to the above percentage content, firstly premix aluminum powder, aluminum-silicon alloy powder, catalyst and waterproofing agent to obtain a premix; then mix the premix, water reducer and other raw materials, and stir evenly to obtain the original Castables for dry quenching coke ovens that generate aluminum nitride.

[0033] Add 4~6wt% water of the above-mentioned raw materials to the castable for CDQ coke oven with in-situ generation of aluminum nitride prepared in this embodiment, mix evenly, vibrate casting, curing at room temperatur...

Embodiment 2

[0035]A castable for dry quenching coke ovens that generates aluminum nitride in situ and a preparation method thereof. With 55~60wt% mullite, 20~25wt% silicon carbide, 4~7wt% aluminum powder, 0.1~2wt% aluminum silicon alloy powder, 4~6wt% α-alumina fine powder, 2~4wt% % silica powder and 4~6wt% calcium aluminate cement as raw materials, with 0.1~0.3wt% catalyst, 0.2~0.5wt% water repelling agent and 0.1~0.3wt% water reducing agent as additives. According to the above percentage content, firstly premix aluminum powder, aluminum-silicon alloy powder, catalyst and waterproofing agent to obtain a premix; then mix the premix, water reducer and other raw materials, and stir evenly to obtain the original Castables for dry quenching coke ovens that generate aluminum nitride.

[0036] Add 4~6wt% water of the above-mentioned raw materials to the castable for CDQ coke oven with in-situ generation of aluminum nitride prepared in this embodiment, mix evenly, vibrate casting, curing at roo...

Embodiment 3

[0038] A castable for dry quenching coke ovens that generates aluminum nitride in situ and a preparation method thereof. With 50~55wt% mullite, 25~30wt% silicon carbide, 4~7wt% aluminum powder, 1~2wt% elemental silicon powder, 4~6wt% α-alumina micropowder, 2~4wt% Silica powder and 4~6wt% calcium aluminate cement are used as raw materials, and 0.1~0.3wt% catalyst, 0.2~0.5wt% water repelling agent and 0.1~0.3wt% water reducer are used as additives. According to the above percentage content, firstly premix aluminum powder, aluminum-silicon alloy powder, catalyst and waterproofing agent to obtain a premix; then mix the premix, water reducer and other raw materials, and stir evenly to obtain the original Castables for dry quenching coke ovens that generate aluminum nitride.

[0039] Add 4-7wt% water of the above-mentioned raw materials to the castable for CDQ coke ovens prepared in this example to generate aluminum nitride in situ, mix evenly, vibrate cast molding, maintain at roo...

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Abstract

The invention relates to a coke dry quenching furnace castable used for in-suit generation of aluminium nitride, and a preparation method thereof. According to the preparation method, 45 to 65wt% of mullite, 15 to 35wt% of silicon carbide, 2 to 8wt% of aluminum powder, 0 to 5wt% of aluminium-silicon alloy powder, 0 to 2wt% of silicon powder, 4 to 6wt% of alpha-aluminium oxide micro powder, 2 to 4wt% of silicon micro powder, and 4 to 6wt% of calcium aluminate cement are taken as raw materials, a catalyst with an amount accounting for 0.1 to 0.3wt% of the amount of the raw materials, an anti-hydration agent with an amount accounting for 0.2 to 0.5wt% of the amount of the raw materials, and a water reducing agent with an amount accounting for 0.1 to 0.3wt% of the amount of the raw materials are taken as additives; aluminum powder, aluminium-silicon powder, the catalyst, and the anti-hydration agent are subjected to pre-mixing so as to obtain a premixed material; the premixed material, the water reducing agent, and the other raw materials are mixed and stirred to be uniform so as to realize in-suit generation of the aluminium nitride coke dry quenching furnace castable. The coke dry quenching furnace castable is excellent in middle temperature and high temperature mechanical properties, wear resistance, and thermal shock stability, is long in service life, is friendly to the environment, and is capable of saving energy, and is suitable for coke dry quenching furnace chute stand columns.

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...

Claims

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Application Information

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IPC IPC(8): C04B35/66
Inventor 张美杰倪康祥顾华志黄奥李洪明邵志君
Owner WUHAN UNIV OF SCI & TECH
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