Highly heatproof and shockproof mullite-cordierite refractory composition

Abstract

The invention relates to a fire resistive material for ceramic burner of iron-smelting hot-blast stove, which mainly comprises 30-50 wt% of synthesized mullite, 15-25 wt% of synthesized cordierite, 10-20 wt% of sillimanite, 5-7% of andalusite, 5-10 wt% of alpha-alumina ultramicro powder and 4-6 wt% of clay.

Description

technical field [0001] The invention relates to a refractory material, in particular to a high thermal shock refractory material for a ceramic burner of an ironmaking hot blast stove. Background technique [0002] The operating temperature of ironmaking hot blast stoves in steel mills is around 1200-1350°C all year round, and the process of supplementing cold air makes the temperature in the furnace change drastically, and it needs to withstand harsh conditions such as chemical erosion of dust brought in by blast furnace gas, strong erosion of combustion gas, and mechanical loads. It is required that refractory materials for ceramic burners of hot blast stoves not only have the characteristics of small creep, high load softening temperature and large heat capacity of ordinary refractory materials, but also require good thermal shock resistance and high strength. [0003] In the prior art, the main crystal phase is high-alumina cordierite refractory material, which is compose...

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Problems solved by technology

Although the refractory composition has a relatively high (60Mpa) compressive strength, its thermal shock resistance is extremely poor, only 15 times / 1100 water cooling, so its service life is shorter