High refractoriness under load and thermal shock resistant fireproof brick

Abstract

The invention discloses a high-refractoriness under load thermal shock-resistant refractory brick, which is prepared from the raw materials of high alumina bauxite, electrically-fused corundum, synthetic mullite, sillimanite, bonding agent, additive and water according to the following mixture ratio by weight portion: 10 to 15 percent of high alumina bauxite granule, 10 to 15 percent of electrically-fused corundum granule, 35 to 45 percent of synthetic mullite granule, 10 to 15 percent of sillimanite powder, 5 to 10 percent of bonding agent, 6 to 10 percent of additive and a proper amount of water; and the brick is prepared by the method comprising the following steps: placing the weighed high alumina bauxite, electrically-fused corundum, synthetic mullite granule into a mixing mill for mixing; after the mixture is mixed uniformly, adding the sillimanite powder, the bonding agent, the additive and the proper amount of water into the mixing mill for mixing for 8 to 12 minutes and obtaining pug of which water content is controlled to be 3 percent; pressing the well mixed pug into green bricks on a brick molding press and placing molded green bodies of which the density is controlled to be 2.808kg / cm<3> into a tunnel kiln for drying; firing the green bricks at 1,460 to 1,480 DEG C and keeping the temperature for 8 to 10 hours; and obtaining finished bricks. The brick has a long service life and can prolong the service life of the kiln.

Description

technical field

[0001] The invention relates to a refractory material, in particular to a high-load soft thermal shock-resistant refractory brick used on a ceramic burner of a hot blast stove. Background technique

[0002] Refractory materials are subdivided into various types according to their specific scope of use, among which high-load soft heat-shock-resistant bricks are mainly used on ceramic burners of hot blast stoves. At present, such products we commonly use are mostly made of high-alumina bauxite clinker and mullite as aggregates, high-alumina bauxite clinker and cordierite as powder materials, and are mixed, mixed, machine-pressed, fired, etc. The disadvantage is that the starting temperature of load softening is low, generally around 1450°C, the number of times of thermal shock stability is small, generally around 40-50 times, and it often occurs due to rapid cooling and rapid heating during use. Peeling phenomenon. Contents of the invention

[0003] The obj...

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