Blast furnace main iron runner castable with TiO2 carbon fibers based on sol-gel method

Abstract

The invention discloses blast furnace main iron runner castable with TiO2 carbon fibers based on a sol-gel method. The blast furnace main iron runner castable is prepared from, by weight, 10-20 parts of alumina particles, 10-15 parts of alumina fine powder, 15-20 parts of brown aluminum oxide particles, 10-20 parts of brown aluminum oxide fine powder, 5-10 parts of silicon carbide, 3-8 parts of alumina micro powder, 3-5 parts of silicon oxide micro powder, 1-3 parts of silicon metal micro powder, 5-10 parts of TiO2 carbon fibers, 2-5 parts of pure calcium aluminate cement, 3-8 parts of strontium titanate powder, 0.2-0.8 part of dispersing agents, 0.2-0.4 part of anti-explosion fibers, wherein the dispersing agents are a mixture prepared from sodium tripolyphosphate and sodium hexametaphosphate according to a certain proportion, and the anti-explosion fibers are polyurethane fibers. The TiO2 carbon fibers prepared from sol and gel serve as carbon crystals of the blast furnace main iron runner castable, the carbon crystals have the advantages of being resistant to corrosion, high in modulus, free of creep, good in oxidation resistance, resistant to ultrahigh temperatures under a non-oxidation environment and resistant to fatigue, and thus the blast furnace main iron runner castable is high in high-temperature mechanical strength and high in chemical erosion resistance.

Description

【Technical field】 [0001] The invention relates to the technical field of castables, in particular to the technical field of blast furnace main iron trough castables based on sol-gel method TiO2 carbon fibers. 【Background technique】 [0002] The blast furnace tapping chute is a channel for guiding high-temperature molten iron slag. The lining of the blast furnace tapping chute is directly subjected to high-temperature erosion of molten iron and slag, mechanical wear, chemical erosion, and frequent alternation of rapid cooling and rapid heating during use. Therefore, refractory materials for blast furnace tapping trough should have good high temperature mechanical strength, chemical corrosion resistance and thermal shock stability. At present, Al2O3-SiC-C castables are generally used as refractory materials for blast furnace tapping channels. The quality of Al2O3-SiC-C castables is mainly reflected in their service life. With the continuous development of blast furnace smelti...

AI Technical Summary

Problems solved by technology

With the strengthening of smelting, the demand for increasing the output of molten iron is becoming increasingly prominent, and the demand for a large amount of iron passing through the main iron channel at one time is also becoming more and more urgent. However, due to the poor thermal shock resistance of the main iron channel, thermal spalling and structural spalling occur, resulting Not anti-corrosion is an important reason for the short life of the main iron channel

"An Al2O3-SiC-C iron channel castable and its preparation method" discloses a preparation method of a catalyst-added iron channel castable, which uses the action of the catalyst at high temperature to generate carbon whiskers in situ to improve the iron channel The high-temperature service performance of the castable material, carbon whiskers have the advantages of high strength and elastic modulus, high temperature resistance, corrosion resistance, etc., which can improve the service performance and prolong the service life of the iron trench castable, but its main defect is the generation of carbon whiskers Limited, the price of the catalyst is expensive, which is not conducive to the realization of industrial production

"An environment-friendly high-performance and long-life castable castable for iron trough and its manufacturing method" discloses a method for preparing castable castable for iron trough with recycled corundum particles as the main raw material. Although it is cost-effective and environmentally friendly, it uses Recycled corundum particles cannot guarantee the stability of the product, and the addition of metal aluminum powder will also affect the high temperature performance of the castable